UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

For the fiscal year ended December 31, 20212022

OR

Commission File Number 001-38139

Byline Bancorp, Inc.

(Exact name of Registrant as specified in its Charter)

Registrant’s telephone number, including area code: (773) 244-7000

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☐ No ☒

Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. Yes ☐ No ☒

Indicate by check mark whether the Registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report ☒

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. ☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b). ☐

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

The aggregate market value of the voting and non-voting common equity held by non-affiliates of the Registrant, based on the closing price of the Registrant’s common stock on the New York Stock Exchange on June 30, 2021,2022, was approximately $585,122,412.$581,838,457.

The number of shares of Registrant’s common stock outstanding as of March 4, 20221, 2023 was 37,829,737.37,717,499.

Portions of the Registrant’s Definitive Proxy Statement relating to its 20222023 Annual Meeting of Stockholders, scheduled to be held on June 7, 2022,6, 2023, are incorporated by reference into Part III of this Report.

Table of Contents

i

Special Note Regarding Forward-Looking Statements

Statements contained in this Annual Report on Form 10-K and in other documents we file with or furnish to the Securities and Exchange Commission (“SEC”) that are not historical facts may constitute “forward-looking statements” within the meaning of the U.S. Private Securities Litigation Reform Act of 1995. Any statements about our expectations, beliefs, plans, strategies, predictions, forecasts, objectives or assumptions of future events or performance are not historical facts and may be forward-looking. These statements are often, but not always, made through the use of words or phrases such as “anticipates,” “believes,” “expects,” “can,” “could,” “may,” “predicts,” “potential,” “opportunity,” “should,” “will,” “estimate,” “plans,” “projects,” “continuing,” “ongoing,” “expects,” “seeks,” “intends” and similar words or phrases. Accordingly, these statements involve estimates, known and unknown risks, assumptions and uncertainties that could cause actual strategies, actions or results to differ materially from those expressed in such statements, and are not guarantees of future results or other events or performance. Because forward-looking statements are necessarily only estimates of future strategies, actions or results, based on management’s current expectations, assumptions and estimates on the date hereof, and there can be no assurance that actual strategies, actions or results will not differ materially from expectations, readersReaders are cautioned not to place undue reliance on such statements.

Our ability to predict results or the actual effects of future plans, strategies or events is inherently uncertain. Factors which could cause actual results or conditions to differ materially from those reflected in forward-looking statements include:

2

2

These risks and uncertainties should be considered in evaluating any forward-looking statements, and undue reliance should not be placed on such statements. Additional information concerning the Company, including additional factors and risks that could materially affect our business and financial results, are included herein. See Item 1A. “Risk Factors”. Forward-looking statements speak only as of the date they are made. We assume no obligation to update any of these statements in light of new information, future events or otherwise unless required under the federal securities laws.

3

PART I

Item 1. Business.

General

Byline Bancorp, Inc., headquartered in Chicago, Illinois, is a bank holding company and we conduct all our business activities through our subsidiary, Byline Bank, a full service commercial bank, and Byline Bank’s subsidiaries. The words “the Company,” “we,” “Byline,” “our” and “us” refer to Byline Bancorp, Inc. and its consolidated subsidiaries, unless we indicate otherwise.

We offer a broad range of banking products and services to small and medium sized businesses, commercial real estate and financial sponsors and to consumers who generally live or work near our branches. During 2021, we began offeringWe offer online account opening to consumer and business customers through our website. We also provide trust and wealth management services to our customers. In addition to our traditional commercial banking business, we provide small ticket equipment leasing solutions through Byline Financial Group, a wholly-owned subsidiary of Byline Bank, headquartered in Bannockburn, Illinois with sales offices in Illinois, and sales representatives in Illinois, Florida, Michigan, New Jersey, and New York. We participate in U.S. government guaranteed lending programs and originate U.S. government guaranteed loans. Byline Bank was the fifth most active originator of SBA loans in the country and the most active SBA lender in Illinois, Wisconsin, and South Dakota,Wisconsin, as reported by the SBA for the fiscal year ended September 30, 2021.2022. As of December 31, 2021,2022, we had consolidated total assets of $6.7$7.4 billion, total gross loans and leases outstanding of $4.6$5.5 billion, total deposits of $5.2$5.7 billion, and total stockholders’ equity of $836.4$765.8 million.

Strategic growth

As part of our strategic growth plan, we explore potential opportunities for expansion in our primary and adjacent market areas through organic growth and the acquisition of financial institutions, branches, and non-banking organizations.

Organic Growth

We believe our local presence and our scale are essential to the continued growth of our deposit base. Small businesses are a significant source of low-cost deposits and represent opportunities for future growth. We believe our small business customers value our ability to provide convenience and access to local, responsive decision makers. As of December 31, 2021,2022, commercial deposits accounted for 48.9%48.5% of total deposits and were 76.0%77.5% of non-interest bearing deposits. Commercial accounts generally have higher deposit balances and transaction volumes than individual deposit accounts.

Our ability to originate loans and leases across a range of industries and product types helps us maintain a diversified loan and lease portfolio across various sectors, including commercial and industrial lending, leasing, U.S. government guaranteed loans and real estate loans, allowing us to efficiently manage our credit exposures and capitalize on more lending opportunities. We have also enhanced our product and lending capabilities with the addition of experienced lending teams hired from larger banks.

The following charts outline the composition of our loan and lease and deposit portfolios as of December 31, 2021:2022:

4

Acquisitions

Our ability to engage in certain merger or acquisition transactions depends on a number of factors, including opportunities in our market areas, access to capital, our bank regulators' views at the time as to the capital levels, quality of management and our overall financial condition, in addition to their assessment of a variety of other factors, including our compliance with lawlaws and regulations. We have successfully completed a number of strategic acquisitions since our recapitalization in 2013, including the following recent transactions:which include:

Additional detail regardingOn November 30, 2022 we announced the execution of an Agreement and Plan of Merger in connection with a proposed acquisition of Inland Bancorp, Inc., a Maryland corporation ("Inland Bancorp"), and Inland Bancorp's wholly owned bank subsidiary, Inland Bank and Trust, an Illinois chartered bank. As of December 31, 2022, Inland Bancorp had $1.2 billion in total assets, $888.7 million of loans, $5.0 million of loans held for sale, and $997.1 million of total deposits. Completion of the transaction is subject to regulatory approvals, the approval of Inland Bancorp's stockholders, and the satisfaction of certain recent acquisitions is containedother closing conditions. We expect the acquisition to close in Note 3the first half of “Notes to the Consolidated Financial Statements” in Item 8 of this Form 10-K.2023.

Branch network and distribution channels

The primary market in which we operate is the Chicago metropolitan area, and our 4337 branch network in this area is our core distribution channel. We take advantage of our focused footprint and deep-rooted relationships to target local customers with a diversified product offering.

Our expansive local branch network enables us to gather low cost deposits, promote the Byline brand and customer loyalty, originate loans, leases and other products and maintain relationships with our customers through regular community involvement. We believe our branch network is fundamental to our ability to achieve successful customer outreach in line with our culture, which promotes high touch engagement with our customers and proactive solutions.

While our branch network will continuecontinues to be our primary delivery channel, we understand the evolving banking environment requires digital interaction to keep pace with our customers’ needs. We continually perform strategic reviews of our branch network and our existing banking footprint. With technology improvements and changes to customers’ banking preferences, we examine branch growth and consolidation potential, customer usage, branch profitability, services provided, markets served and proximity to other locations with a goal of minimizing customer impact and deposit runoff.

Since our recapitalization in June 2013, our branch network has been reduced from 88 to 44,38, including 13 branches added through acquisition. During 2020 and 20212022 we consolidated 17six branches within our network with minimal impact on our customer service levels, convenience, and business development capabilities. In December 2021 we announced plans to consolidate six branches during the second quarter of 2022. We expect these consolidations to generate over $5.3 million in annual cost savings and expect to reinvest approximately 70% of the anticipated annualized cost savings into talent and technology that will further enhance our digital banking capabilities.

We plan to continue to leverage our seasoned management team, the attractive market opportunity in the Chicago metropolitan area, our diversified lending approach and our track record of successfully integrating acquisitions to drive future growth. We believe that having a deep understanding of customers, longstanding ties to the communities in which we operate, a strong market position, and exceptional employees allow us to provide the attention, responsiveness, and customized service our customers seek while offering a diverse range of products to serve a variety of needs.

Segments

We have one reportable segment. Our chief operating decision makers evaluate our business and operations using consolidated information for purposes of allocating resources and assessing performance.

Our Products and Services

We are a full service, commercial bank offering a broad range of deposit products and lending services to small and medium sized businesses, commercial real estate and financial sponsors, and consumers around our 4337 branch locations in the Chicago metropolitan area and one branch in Brookfield, Wisconsin. The products and services we offer are described below.

Commercial banking

Commercial banking is a fundamental component of our business. We define commercial banking as lending to small and medium sized businesses, real estate and financial sponsors. We offer a comprehensive range of commercial loan, deposit and treasury management products. Our primary commercial lending groups are described below:

Commercial & Industrial.Industrial. Our commercial and industrial (“C&I”) group focuses on small and lower middle market businesses with up to $100 million of annual revenue and seeks to establish long term relationships. We believe this customer segment is underserved by larger institutions that do not focus on this space, as well as by smaller institutions that lack product sophistication and capabilities. We offer a broad range of lending products including term loans, revolving lines of credit and treasury management products and services. As of December 31, 2021,2022, the C&I group managed a portfolio of $1.7$2.2 billion in loans outstanding.

5

Commercial real estate.estate. Our commercial real estate (“CRE”) business focuses on experienced real estate professionals with long track records of performance and access to ample equity capital sources. We believe our specialized expertise and efficient decision making process differentiate us from our competitors. We offer fixed and floating rate term loans, construction financing and revolving lines of credit with a wide range of term options. Our portfolio is broadly diversified by geography and property type including loans secured by multifamily, industrial, retail, and office properties. As of December 31, 2021,2022, the CRE group had $801.8$962.7 million in loans outstanding.

Sponsor finance.finance. Our sponsor finance group provides senior secured financing solutions to private equity backed lower middle market companies throughout the U.S. with earnings before interest, tax, depreciation and amortization generally between $2.0 million and $10.0 million. We support the acquisition, recapitalization and growth investment efforts of private equity firms operating in the lower middle market, and we believe our expertise in this niche is unique for a bank our size. As of December 31, 2021,2022, we had $440.5$556.6 million in sponsor finance loans outstanding.

Syndications.Syndications. From time to time, our syndications group seeks to deploy excess liquidity by opportunistically participating in syndicated loans, acquiring whole loans, or purchasing participations from lead banks that have existing relationships with well capitalized and experienced sponsors. We employed this strategy extensively following our recapitalization by leveraging our relationships with local, regional and national lenders as we developed our own lending capabilities and had excess liquidity. Now, with developed lending capabilities, our participation in syndications has decreased and represents a smaller portion of our portfolio. The syndications group targets transactions in the home mortgage, CRE, and C&I categories that provide attractive risk/reward characteristics, and we continue to maintain the ability to sell loan positions to manage credit and specific customer and industry concentrations. As of December 31, 2021,2022, the group had $231.7$329.2 million in loan syndications outstanding.

Commercial deposits and treasury management.management. We also support our business customers with a variety of deposit and treasury management products, along with business transaction accounts. Our comprehensive suite of products includes treasury services, information reporting, fraud management, cash collection, and interest rate derivative products. We believe these tailored products allow us to provide a robust service offering to our customers and to support their day to day funding and risk management needs. These services are provided through multiple points of contact including branch, online, and mobile interfaces.

Small Business Capital.Our U.S. government guaranteed lending business serves small businesses in need of, and qualifying for, SBA and USDA loans (referred to together as “U.S. government guaranteed loans”). We provide SBA lending services throughout the country, with a primary focus on the Midwest, Tennessee, Florida, Texas, Colorado, Utah, and California. We generally sell the government guaranteed portion of SBA and USDA loans into the secondary market while retaining the non-guaranteed portion of the loan and the servicing rights. This allows us to realize one time gain on sale income along with a recurring servicing and interest revenue stream. In addition to the business development officers who we rely on to generate new business, we also have a dedicated servicing, portfolio management and workout staff with specialized expertise in U.S. government guaranteed loans. As of December 31, 2021,2022, total loans and leases included the guaranteed amount of U.S. government guaranteed loans of $231.2$123.2 million. The total unpaid principal balances of SBA and USDA loans serviced for others was $1.7 billion at December 31, 2021.2022.

Retail deposits

We offer customers traditional retail deposit products through our branch network, consumer and business online account opening through our website, and customer access to their accounts through online and mobile banking platforms. The wide variety of deposit products we offer include non-interest-bearing accounts, money market demand accounts, savings accounts, interest-bearing checking accounts and time deposits with maturities ranging from seven days to five years. We consider our core deposits, defined as all deposits except time deposits exceeding $100,000, to be our primary and most valuable funding source. As of December 31, 2021,2022, core deposits represented 91.9%92.7% of our total deposits. In addition to these products, we offer ATM and debit cards as well as online, mobile, and text banking. We strive to retain an attractive deposit mix from both large and small customers as well as a broad market reach, which has resulted in our top 50 customers accounting for only 11.6%approximately 12% of all deposits as of December 31, 2021.2022. Our bankers are incentivized to acquire and maintain quality core deposits as we depend on these deposits to fund the majority of our loans and leases. We believe that our long standing and high quality relationships with our depositors who provide us with long term funding are due to the convenience and dedicated service we offer. We leverage our expansive branch locations and deep network of customer relationships in the Chicago metropolitan area to provide both low cost funding sources for our lending business and deposit related fee income. We had $5.2$5.7 billion of deposits at December 31, 2021,2022, and our average cost of deposits was 0.09%0.36% for the year ended December 31, 2021.2022.

Small ticket equipment leasing

Through our Bank’s subsidiary, Byline Financial Group (“BFG”), we provide financing solutions for equipment vendors and their end users. The vertical markets served by our equipment vendors specialize primarily in healthcare, manufacturing, technology, materials handlings, small equipment construction, specialty vehicles and energy efficiency. The end users (i.e., our lessees and borrowers) are primarily physician group practices, other healthcare related entities, manufacturers, retailers, veterinarians, and wholesalers. The average lease size at origination for BFG for the year ended December 31, 20212022 was approximately $63,000.$72,000. Our sales team originates leases throughout the country, and we have lessees in nearly every state. As of December 31, 2021,2022, BFG had $357.8$524.0 million in leases outstanding with a weighted average life of approximately 4.53.5 years.

6

Trust and wealth management

We provide investment, trust and wealth management services to our customers, such as foundations and endowments and high net worth individuals, which include fiduciary and executor services, financial planning solutions, investment advisory services, and

6

private banking services. These services are provided through credentialed investment, legal, tax, and wealth management professionals who identify opportunities and provide services tailored to our customers’ goals and objectives. Assets under managementadministration were $663.4$548.7 million as of December 31, 2021.2022.

Competition

The financial services industry is highly competitive as we compete for loans, leases, deposits and customer relationships within and outside of our markets. Competition involves efforts to retain current customers, make new loans and leases, obtain new deposits, increase the scope and sophistication of services offered, the availability, ease of use, and range of banking services provided on the internet and through mobile devices, and offer competitive interest rates paid on deposits and charged on loans and leases. We face competition not only from other financial holding companies and commercial banks, but also from internet banks, savings and loan associations, FinTech companies, credit unions, trust and wealth management providers, and other providers of financial services and products. Competition is generally based on the variety, rates and terms of products and services offered to customers and the performance of funds under management.

Human Capital

At Byline, we believeare a bank that believes in being the bank our customers deserve, which, as embodied inputting our name means taking ownership, initiative, action,behind everything we do and responsibility for what we do. Our business is about people—we’re here to roll up our customerssleeves and our employees. We seek to help our customers build, make, and do— none of which would be possible without our employees. write their stories. Our #1 core value, orreflected in our “Things That Matter,” is our People.People, all of whom are encouraged to live out a shared purpose of making people’s lives better, helping businesses thrive, and strengthening the communities we serve. We believe one of the biggest differentiators of our performance is our team. The needpurpose driven leadership facilitates progress in achieving a diverse and inclusive workforce and in driving performance. We are dedicated to attract, retain,attracting, retaining, and develop the rightdeveloping top talent to accomplish our long-term strategy which is critical to our success.

Governance and Oversight

Our Board of Directors overseesand executive management team are committed to executing on our long-term vision. Our Board members are accomplished leaders from diverse backgrounds, bringing the perspectives, skills, and experience necessary to use independent judgment that will effectively challenge and drive continued success. Our Board members oversee our corporate strategy and sets the tone for our culture, values and high ethical standards, and, through its Committees, holds management accountable for results.

Beginning in 2020, the Board expanded the scope of our Compensation Committee beyond its traditional compensation focused role to include oversight of allByline’s human capital management efforts within Byline.efforts. The Compensation Committee reviews and monitors matters related to human capital management, including Company culture, talent development, diversity, equity and inclusion ("DEI"(“DEI”) programs and initiatives and other environmental, social, and governance ("ESG"(“ESG”) matters.

Diversity, Equity and Inclusion

To facilitate talent attraction, development and retention across our franchise, we strive to make Byline a diverse, inclusive, safe and healthy workplace, with opportunities for our employees to grow and develop in their careers, supported by strong compensation, benefits, health and welfare programs.

Our key programs and initiatives that are focused to attract, develop and retain our diverse workforce include:

7

7

We embrace the broad spectrum of differences every person brings to our team. Overall diversity within our teamsis measured as all females and define diversity by both gender and ethnicity/race.males who are racially or ethnically diverse. Our key human capital diversity metrics for 20212022 are as follows:

Initiatives Supporting Physical, Emotional, Financial and Social Wellbeing

We offer competitive salaries based onbelieve our compensation philosophy. Thisstrategy supports our core principles and provides every employee with a competitive compensation package that fairly reflects their individual contributions to Byline. We offer a compensation package which includes base pay, short-term incentives (annual cash bonuses, commissions plans, and referral incentives) and long-term incentives (equity-based compensation) for applicable roles. Our approach ensures that entry levelto compensation is driven by internal and external equity which seeks to ensureour compensation elements are competitive and market driven. Our compensation programs are structured to: (1) deliver competitive compensation under a disciplined and objective structure; (2) establish target pay at market competitive levels; and (3) provide short-term incentive opportunities to employees received competitive wages withinwho impact department and business results. Over the industry.past year we have taken several steps to seek to ensure market competitiveness, including raising the starting wage of all employees to at least $18/hour, providing higher than average salary adjustments and including additional personnel in our incentive programs. In addition, our compensation is performance-basedwe have implemented a job architecture and tiedpaygrade structure that has been communicated to business and individual results. We have taken significant steps to continue to benchmark job roles and compensation against relevant market data and adjust our compensation to attract and retain talent.all employees.

We offer benefitsBenefits that include comprehensive health, life, and disability coverage that are funded, in whole or in part, by us, including:the Company include:

Development opportunitiesOpportunities

We recognize the critical importance of providing career development and advancement opportunities for all employees. Accordingly, we provide a variety of formal and informal development opportunities to help employees grow in their current roles and build new skills. During 2021,2022, we continued our focus on development by holding all managers accountable for setting goals, having more frequent career development conversations, with all employees, providing regular coaching and feedback, and highlightingrecognizing accomplishments of all employees. We introduced resources that allow managers to conduct career conversations based on the desires of the employees and create development opportunities across the Bank to move intotake on new roles and take on new assignments.assignments across the bank. We increasedcontinued our investment in both leader and manager development in 20212022 with a new programsmanagement program and will continue to invest in these programs in 20222023 and beyond.

The 2022 performance management process included the addition of four behavioral competencies expected of all Byline employees that are aligned with our values and our strategic plan: Valuing Differences, Collaborating for Results, Delivering Customer Focused Solutions, and Continuous Improvement. Each employee received feedback and education on these competencies throughout our performance management process and we will create greater accountability in 2023 and beyond.

8

We strive to optimally deploy existing talent across Byline by focusing on where our employees excel and helping them find thetheir best roles for them. One of the hallmarksroles. We believe one example of our success in this areaeffort is demonstrated by our ability to fill vacancies from within. During 2022, 20% of our job postings were filled internally.

We encourage our team members to pursue educational opportunities that will help improve job performance and professional development. ToOur tuition reimbursement and student loan repayment programs have helped to further this goal we launched tuition reimbursement benefits in 2021.Wefor many of our employees. We also support employees in obtaining certifications and taking approved educational courses to support their job role and expansion ofexpand their skills.

We believe that talentTalent development is also a criticalkey part of our succession planning of ourfor executive management. Our Board of Directors oversees the succession planning for executive management on an annual basis, including a focus on outlining keybasis. Key development needs are identified through formalized assessments for employees on succession plans for these key roles.leadership, business, and executive role-based skills, and collaborative talent review and feedback sessions.

Employee Recognition and Engagement

8

Community and Social Impact

We are committed to helping the local communities in which we live and work, to grow and thrive, today and into the future. One way we seek to do this is by providing employees paid time off to participate in community-based volunteer programs. Throughout the year, employees make a positive impact in their local communities and have found a multitude of special ways to continue volunteering during the pandemic.volunteer and give back. During 2021,2022, Byline made and/or supported:

Human Capital Metrics

As of December 31, 2021,2022, we had 970977 employees (929(948 full time, and 4129 part time) in locations primarily across the Chicagoland and greater Milwaukee, Wisconsin areas. Our employees are not represented by a collective bargaining agreement. We consider our relationship with our employees to be good. OurThe average tenure of our employees is over seven years. In 2021,During 2022, our employee voluntary attrition rate was 17%. Attrition rates during 2021 were15%, which, although lower year-over-year, remains higher year over year, coming offthan the abnormally low attrition prior to and during the pandemic in 2019 and 2020. WeDuring 2022, we hired 237202 new employees into the Bank during 2021.– with 46% being hired into our customer-facing retail branches, and 54% into other key areas across the Bank. We believe we have a strong bench of talent and are attracting experienced bankers from larger regional banks as a result of continued market disruptiondisruption.

9

Fair Employment Practices

Byline Bank is proud to be committed to maintaining a diverse workforce and an inclusive work environment. We are an Equal Opportunity/Opportunity / Affirmative Action employer. All qualified applicants will receive consideration for employment without regard to their actual or perceived race, color, religion, national origin, ancestry, marital or civil union status, sex, gender, pregnancy, age, citizenship status, disability, military or veteran status, gender identity, expression or preference, sexual orientation, genetic information, order of protection status or any other characteristic protected by law. We are committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans in our job application procedures. At Byline, our hiring decisions are based on merit, qualifications, and business needs.

Discrimination & Sexual Harassment in the Workplace

Byline Bank prohibits any form of unlawful discrimination, sexual harassment or other forms of harassment in the workplace. We believe that our employees should be able to work in an atmosphere free from all forms of harassment. Our policies regarding equal employment opportunity, discrimination, sexual harassment, and harassment are included in our Employee Handbook. All employees are required to review and acknowledge these policies in our Handbook annually. In addition, all employees are required to complete training regarding workplace discrimination, sexual harassment, and other forms of harassment annually. In addition to these training programs, managers are required to complete training annually for unconscious bias and interviewing job candidates.

For additional information, please see our definitive proxy statement for our 20222023 Annual Meeting of Stockholders, a copy of which will be filed with the SEC no later than 120 days after the end of our fiscal year.

Corporate Information

Our principal executive offices are located at 180 North LaSalle Street, Suite 300, Chicago, Illinois 60601, and our telephone number at that address is (773) 244-7000. Our website address is www.bylinebancorp.com. We make available at this address, under the “Investor Relations” tab, free of charge, our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) as soon as reasonably practicable after such material is electronically filed with, or furnished to, the SEC. These filings are also available on the SEC's website at www.sec.gov. The contents of our website are not incorporated by reference into this report.

Supervision and Regulation

We and our subsidiaries are subject to extensive regulation under federal and state banking laws that establish a comprehensive framework for our operations. This framework may materially affect our growth potential and financial performance and is intended

9

primarily for the protection of depositors, customers, federal deposit insurance funds and the banking system as a whole, not for the protection of our stockholders and creditors. Significant elements of the statutes, regulations and policies applicable to us and our subsidiaries are described below.

Regulatory Agencies

We are a bank holding company under the Bank Holding Company (“BHC”) Act. Consequently, we and our subsidiaries are subject to supervision, regulation and examination by the Board of Governors of the Federal Reserve System (the "FRB"). The BHC Act provides generally for “umbrella” regulation of bank holding companies and functional regulation of holding company subsidiaries by applicable regulatory agencies. Byline Bank, our bank subsidiary, is a Federal Deposit Insurance Corporation (“FDIC”) insured commercial bank chartered under the laws of Illinois. Our bank is not a member of the FRB. Consequently, the FDIC and the Illinois Department of Financial and Professional Regulation (“IDFPR”) are the primary regulators of our bank and also regulate our bank’s subsidiaries. As the owner of an Illinois-chartered bank, we are also subject to supervision and examination by the IDFPR. We are also subject to the disclosure and regulatory requirements of the Securities Act and the Exchange Act as administered by the SEC, and the rules adopted by the New York Stock Exchange (the “NYSE”) applicable to NYSE listed companies.

10

Permissible Activities for Bank Holding Companies

In general, the BHC Act limits the business of bank holding companies to banking, managing or controlling banks and other activities that the FRB has determined to be so closely related to banking as to be a proper incident thereto, which include certain activities relating to extending credit or acting as an investment or financial advisor. We currently do not conduct any non-banking activities through any non-bank subsidiaries.

Bank holding companies that qualify and elect to be treated as “financial holding companies” may engage in a broader range of additional activities than bank holding companies that are not financial holding companies. In particular, financial holding companies may engage in activities that are (i) financial in nature or incidental to such financial activities or (ii) complementary to a financial activity and do not pose a substantial risk to the safety and soundness of depository institutions or the financial system generally. These activities include securities underwriting and dealing, insurance underwriting and making merchant banking investments. We have not elected to be treated as a financial holding company and currently have no plans to make a financial holding company election.

The FRB has the power to order any bank holding company or any of its subsidiaries to terminate any activity or to terminate its ownership or control of any subsidiary when the FRB has reasonable grounds to believe that continuing such activity, ownership or control constitutes a serious risk to the financial soundness, safety or stability of any bank subsidiary of the bank holding company.

Permissible Activities for Banks

As an Illinois-chartered commercial bank, our bank’s business is subject to extensive supervision and regulation by state and federal bank regulatory agencies. Our business is generally limited to activities permitted by Illinois law and any applicable federal laws. Under the Illinois Banking Act, our bank may generally engage in all usual banking activities, including, among other things, accepting deposits; lending money on personal and real estate security; issuing letters of credit; buying, discounting, and negotiating promissory notes and other forms of indebtedness; buying and selling foreign currency and, subject to certain limitations, certain investment securities; engaging in certain insurance activities and maintaining safe deposit boxes on premises.

Illinois law also imposes restrictions on Byline Bank’s activities intended to ensure the safety and soundness of our bank. For example, Byline Bank is restricted under the Illinois Banking Act from investing in certain types of investment securities and is generally limited in the amount of money it can lend to a single borrower or invest in securities issued by a single issuer.

Acquisitions by Bank Holding Companies

The BHC Act, Section 18(c) of the Federal Deposit Insurance Act, popularly known as the “Bank Merger Act”, the Illinois Banking Act, the Illinois Bank Holding Company Act and other federal and state statutes regulate acquisitions of commercial banks and other FDIC-insured depository institutions. We must obtain the prior approval of the FRB under the BHC Act before (i) acquiring more than 5% of the voting stock of any FDIC-insured depository institution or other bank holding company (other than directly through our bank), (ii) acquiring all or substantially all of the assets of any bank or bank holding company or (iii) merging or consolidating with any other bank holding company. Under the Bank Merger Act, the prior approval of the FDIC is required for our bank to merge with another bank or purchase all or substantially all of the assets or assume any of the deposits of another FDIC- insured depository institution or to assume certain liabilities of non-banks. In reviewing applications seeking approval of merger and acquisition transactions, banking regulators consider, among other things, the competitive effect and public benefits of the transactions, the capital position and managerial resources of the combined organization, the risks to the stability of the U.S. banking or financial system, the applicant’s performance record under the Community Reinvestment Act of 1977 (“CRA”), the applicant’s compliance with fair housing and other consumer protection laws and the effectiveness of all organizations involved in combating money laundering activities. In addition, failure to implement or maintain adequate compliance programs could cause banking regulators not to approve an acquisition where regulatory approval is required or to prohibit an acquisition even if approval is not required.

10

Dividends; Stress TestingDividends

We are a legal entity separate and distinct from Byline Bank and other subsidiaries. As a bank holding company, we are subject to certain restrictions on our ability to pay dividends under applicable banking laws and regulations.

Federal banking regulators are authorized to determine under certain circumstances relating to the financial condition of a bank holding company or a bank that the payment of dividends would be an unsafe or unsound practice and to prohibit payment thereof. In particular, federal banking regulators have stated that paying dividends that deplete a banking organization’s capital base to an inadequate level would be an unsafe and unsound banking practice and that banking organizations should generally pay dividends only out of current operating earnings. In addition, in the current financial and economic environment, the FRB has indicated that bank holding companies should carefully review their dividend policy and has discouraged payment ratios that are at maximum allowable levels unless both asset quality and capital are very strong. Under the capital rules defined in the Regulatory Capital Requirements section, institutions that seek to pay dividends must maintain 2.5% in Common Equity Tier 1 capital attributable to the capital conservation buffer. For more information on these financial measures at the Company and Byline Bank, see Note 2120 of the notes to our audited consolidated financial statements contained in Item 8 of this report.

11

A significant portion of our income, on a stand-alone basis, comes from dividends from our bank, which is also the primary source of our liquidity. In addition to the restrictions discussed previously, our bank is subject to limitations under Illinois law regarding the level of dividends that it may pay to us. Under the Illinois Banking Act, Byline Bank generally may not pay dividends in excess of its net profits. Under these restrictions, Byline Bank could pay aggregate dividends of approximately $161.7$126.9 million to us without obtaining affirmative regulatory approvals as of December 31, 2021.

The FRB and the FDIC have implemented rules regarding company-run stress testing. These rules require bank holding companies and banks with average total consolidated assets greater than $10 billion to conduct an annual company-run stress test of capital, consolidated earnings and losses under one base and at least two stress scenarios provided by the federal banking regulators. Neither we nor our bank is currently subject to the stress testing requirements, but we expect that if we become subject to those requirements, the FRB, the FDIC and the IDFPR will consider our results and those of our bank as an important factor in evaluating our and our bank’s capital adequacy, any proposed acquisitions by us or by our bank and whether any proposed dividends or stock repurchases by us or by our bank may be an unsafe or unsound practice.2022.

Transactions with Affiliates and Insiders

Transactions between our bank and its subsidiaries, on the one hand, and us or any other subsidiary, on the other hand, are regulated under Sections 23A and 23B of the Federal Reserve Act. The Federal Reserve Act imposes quantitative and qualitative requirements and collateral requirements on covered transactions by Byline Bank with, or for the benefit of, its affiliates. Generally, Sections 23A and 23B of the Federal Reserve Act limit the extent to which our bank or its subsidiaries may engage in “covered transactions” with any one affiliate to an amount equal to 10% of our bank’sbank���s capital stock and surplus, limits the aggregate amount of all such transactions with all affiliates to an amount equal to 20% of such capital stock and surplus, and requires those transactions to be on terms at least as favorable to our bank as if the transaction were conducted with an unaffiliated third-party. Covered transactions are defined by statute to include a loan or extension of credit, as well as a purchase of securities issued by an affiliate, a purchase of assets (unless otherwise exempted by the FRB) from the affiliate, certain derivative transactions with an affiliate, the acceptance of securities issued by the affiliate as collateral for a loan, and the issuance of a guarantee, acceptance or letter of credit on behalf of an affiliate. In addition, any credit transactions with any affiliate must be secured by designated amounts of specified collateral.

Federal law also limits our bank’s authority to extend credit to its insiders, which is defined under applicable law to include its directors, executive officers and 10% stockholders, as well as to entities controlled by such persons. Among other things, extensions of credit to insiders are required to be made on terms that are substantially the same as, and follow credit underwriting procedures that are not less stringent than, those prevailing for comparable transactions with unaffiliated persons. Also, the terms of such extensions of credit may not involve more than the normal risk of non-repayment or present other unfavorable features and may not exceed certain limitations on the amount of credit extended to such persons individually and in the aggregate. In addition, we have certain stockholders who are foreign nationals, and we and these foreign national stockholders have entered into commitments with the FRB that restrict our ability to engage in certain business transactions without the consent of the FRB.

Source of Strength

FRB policy and federal law require bank holding companies to act as a source of financial and managerial strength to their subsidiary banks. Under this requirement, we are expected to commit resources to support Byline Bank, including at times when we may not be in a financial position to provide such resources, and it may not be in our, or our stockholders’ or creditors’, best interests to do so. In addition, any capital loans we make to our bank are subordinate in right of payment to depositors and to certain other indebtedness of our bank. In the event of our bankruptcy, any commitment by us to a federal banking regulatory agency to maintain the capital of our bank will be assumed by the bankruptcy trustee and entitled to priority of payment.

Regulatory Capital Requirements

The FRB monitors the capital adequacy of our holding company on a consolidated basis, and the FDIC and the IDFPR monitor the capital adequacy of our bank. The banking regulators use a combination of risk-based guidelines and a leverage ratio to evaluate capital adequacy. The risk-based capital guidelines applicable to us and our bank are based on the Basel Committee’s December 2010

11

final capital framework for strengthening international capital standards, known as Basel III, as implemented by the federal banking regulators, as well as various other rules implemented by the federal banking regulators as described below. The risk-based guidelines are intended to make regulatory capital requirements sensitive to differences in credit and market risk profiles among banks and bank holding companies, to account for off-balance sheet exposure and to minimize disincentives for holding liquid assets.

The Capital Rules.Rules. Over the past several years, the federal banking regulators have adopted a number of final rules, which we refer to as the Capital Rules, implementing Basel III, various provisions of the Dodd-Frank Act, various provisions of the Economic Growth Regulatory Relief and Consumer Protection Act (the “Consumer Protection Act”) and certain other statutory and regulatory provisions relating to capital requirements . The Capital Rules, among other things, (i) include a capital measure called “Common Equity Tier 1” (“CET1”), (ii) specify that Tier 1 capital consists of CET1 and “Additional Tier 1 capital” instruments meeting certain revised requirements, (iii) define CET1 narrowly by requiring that most deductions/adjustments to regulatory capital measures be made to CET1 and not to the other components of capital, and (iv) expand the scope of the deductions/adjustments to capital as compared to prior regulations. The Capital Rules also address risk based capital requirements and risk weights and other issues affecting regulatory capital ratio calculations.

Under the Capital Rules, the minimum capital ratios are (i) 4.5% CET1 to risk-weighted assets, (ii) 6% Tier 1 capital (that is, CET1 plus Additional Tier 1 capital) to risk-weighted assets, (iii) 8% total capital (that is, Tier 1 capital plus Tier 2 capital) to risk-weighted assets and (iv) 4% Tier 1 capital to average consolidated assets as reported on consolidated financial statements (known as the “leverage ratio”).

12

The current Capital Rules also include a capital conservation buffer designed to absorb losses during periods of economic stress. The capital conservation buffer, which is composed entirely of CET1, is in addition to these minimum risk-weighted asset ratios. The capital conservation buffer is equal to 2.5% of CET1. In addition, the Capital Rules provide for a countercyclical capital buffer applicable only to certain covered institutions. We do not expect the countercyclical capital buffer to be applicable to us or our bank. Banking institutions with a ratio of CET1 to risk-weighted assets above the minimum but below the capital conservation buffer (or below the combined capital conservation buffer and countercyclical capital buffer, when the latter is applied) will face constraints on dividends, equity repurchases, and compensation based on the amount of the shortfall.

As a result of the fully phased-in capital conservation buffer rule, we and our bank are required to maintain an additional capital conservation buffer of 2.5% of CET1, effectively resulting in minimum ratios of (i) 7% CET1 to risk-weighted assets, (ii) 8.5% Tier 1 capital to risk-weighted assets, (iii) 10.5% total capital to risk-weighted assets and (iv) a minimum leverage ratio of 4%.

The Capital Rules provide for a number of deductions from and adjustments to CET1. These include, for example, the requirement that mortgage servicing rights, certain deferred tax assets and significant investments in non-consolidated financial entities be deducted from CET1 to the extent that any one such category exceeds 10% of CET1 or all such categories in the aggregate exceed 15% of CET1. Implementation of the deductions and other adjustments to CET1 began on January 1, 2015 and have been phased in over the past several years. The Capital Rules also generally preclude certain hybrid securities, such as trust preferred securities, from being counted as Tier 1 capital for most bank holding companies. Bank holding companies such as us who had less than $15 billion in assets as of December 31, 2009 (and who continue to have less than $15 billion in assets) are permitted to include qualifying trust preferred securities issued prior to May 19, 2010 as Additional Tier 1 capital under the Capital Rules, however.

In addition, under the general risk-based Capital Rules, the effects of accumulated other comprehensive income items included in capital were excluded for the purposes of determining regulatory capital ratios. Under the Capital Rules, the effects of certain accumulated other comprehensive income items are not excluded; however, non-advanced approaches banking organizations, including us and Byline Bank, were able to make a one-time permanent election to continue to exclude these items.

The Capital Rules also include a standardized approach for risk weightings of assets that include more risk-sensitive categories compared to previous capital rules. These risk-weighting categories depend on the nature of the assets, generally ranging from 0%, for U.S. government and agency securities, to 600% for certain equity exposures, and resulting in higher risk weights for a variety of asset categories.

With respect to our bank, the Capital Rules also revised the prompt corrective action regulations pursuant to Section 38 of the Federal Deposit Insurance Act (the “FDIA”). On September 17, 2019, pursuant to the Consumer Protection Act, the federal banking regulators issued a final rule meant to simplify the capital rules for community banks. Under the final rule, most depository institutions and depository institution holding companies that have less than $10 billion in total consolidated assets, that have limited amounts of off-balance sheet exposures and trading assets and liabilities, and that have a community bank leverage ratio of greater than 9% would be eligible to opt into a community bank leverage ratio framework beginning on January 1, 2020. Under the final rule, should a qualified community bank or its holding company elect to use the community bank leverage ratio and maintain a community bank leverage ratio of greater than 9% then it would not be subject to other risk-based and leverage capital requirements, including the risk-based capital rules relating to high volatility commercial real estate, mortgage servicing rights, certain deferred tax assets and significant investments in non-consolidated financial entities, and would be considered to have met the well capitalized ratio requirements for purposes of Section 38 of the Federal Deposit Insurance Act and the generally applicable capital requirements under the federal banking regulators’ capital rules. While the community bank leverage ratio framework is available to us and Byline Bank, neither we nor Byline Bank have elected to adopt the community bank leverage ratio framework at this time.

12As part of the adoption of ASU 2016-13, the Company has elected to opt into the regulators’ joint current expected credit losses ("CECL") transition provision, which allows the Company to phase in the capital impact of the adoption of CECL over the next three years beginning January 1, 2022. Accordingly, capital ratios as of December 31, 2022 reflect 25% of the CECL impact.

13

Liquidity Regulations

Historically, the regulation and monitoring of bank and bank holding company liquidity has been addressed as a supervisory matter, without required formulaic measures. The Basel III final framework requires banks and bank holding companies to measure their liquidity against specific liquidity tests that, although similar in some respects to liquidity measures historically applied by banks and regulators for management and supervisory purposes, going forward would be required by regulation. One test, referred to as the liquidity coverage ratio, or LCR, is designed to ensure that the banking entity maintains an adequate level of unencumbered high-quality liquid assets equal to the entity’s expected net cash outflow for a 30 day time horizon (or, if greater, 25% of its expected total cash outflow) under an acute liquidity stress scenario. The other test, referred to as the net stable funding ratio, or NSFR, is designed to promote more medium- and long-term funding of the assets and activities of banking entities over a one-year time horizon. These requirements incentivize banking entities to increase their holdings of U.S. Treasury securities and other sovereign debt as a component of assets and increase the use of long-term debt as a funding source.

The federal banking regulators approved final rules implementing the LCR for advanced approaches banking organizations (i.e., banking organizations with $250 billion or more in total consolidated assets or $10 billion or more in total on-balance sheet foreign exposure) and a modified version of the LCR for bank holding companies with at least $50 billion in total consolidated assets that are not advanced approaches banking organizations. Neither of these final versions of the LCR apply to us or our bank. On October 20, 2020, the federal banking regulators also approved a final rule implementing the NSFR that requires certain U.S. banking organizations to ensure that they have access to stable funding over a defined time period. The final rule largely, with minor revisions, adopted the rule as originally proposed. The final rule woulddoes not apply to U.S. banking organizations with less than $50 billion in total consolidated assets such as us and Byline Bank.

Prompt Corrective Action Framework

The FDIA also requires the federal banking regulators to take prompt corrective action in respect of depository institutions that fail to meet specified capital requirements. The FDIA establishes five capital categories: “well-capitalized”, “adequately capitalized”, “undercapitalized”, “significantly undercapitalized”, and “critically undercapitalized”. The federal banking regulators are required to take certain mandatory supervisory actions, and are authorized to take other discretionary actions, with respect to institutions that are undercapitalized, significantly undercapitalized or critically undercapitalized. The severity of these mandatory and discretionary supervisory actions depends upon the capital category in which the institution is placed. The relevant capital measures, which reflect changes under the Capital Rules that became effective on January 1, 2015, are the total capital ratio, the CET1 capital ratio, the Tier 1 capital ratio and the leverage ratio.

A bank will be (i) “well capitalized” if the institution has a total risk-based capital ratio of 10% or greater, a CET1 capital ratio of 6.5% or greater, a Tier 1 risk-based capital ratio of 8% or greater and a leverage ratio of 5% or greater, and is not subject to any order or written directive by any such regulatory authority to meet and maintain a specific capital level for any capital measure; (ii) “adequately capitalized” if the institution has a total risk-based capital ratio of 8% or greater, a CET1 capital ratio of 4.5% or greater, a Tier 1 risk-based capital ratio of 6% or greater and a leverage ratio of 4% or greater and is not “well capitalized”; (iii) “undercapitalized” if the institution has a total risk-based capital ratio that is less than 8%, a CET1 capital ratio less than 4.5%, a Tier 1 risk-based capital ratio of less than 6% or a leverage ratio of less than 4%; (iv) “significantly undercapitalized” if the institution has a total risk-based capital ratio of less than 6%, a CET1 capital ratio less than 3%, a Tier 1 risk-based capital ratio of less than 4% or a leverage ratio of less than 3%; and (v) “critically undercapitalized” if the institution’s tangible equity is equal to or less than 2% of average quarterly tangible assets. A bank’s capital category is determined solely for the purpose of applying prompt corrective action regulations, and the capital category may not constitute an accurate representation of Byline Bank’s overall financial condition or prospects for other purposes.

The FDIA generally prohibits a depository institution from making any capital distributions (including payment of a dividend) or paying any management fee to its parent holding company if the depository institution would thereafter be “undercapitalized”. An institution that is categorized as undercapitalized, significantly undercapitalized or critically undercapitalized is required to submit an acceptable capital restoration plan to its appropriate federal banking regulator. Under the FDIA, in order for the capital restoration plan to be accepted by the appropriate federal banking agency, a bank holding company must guarantee that a subsidiary depository institution will comply with its capital restoration plan, subject to certain limitations. The bank holding company must also provide appropriate assurances of performance. The obligation of a controlling bank holding company under the FDIA to fund a capital restoration plan is limited to the lesser of 5% of an undercapitalized subsidiary’s assets or the amount required to meet regulatory capital requirements. An undercapitalized institution is also generally prohibited from increasing its average total assets, making acquisitions and capital distributions, establishing any branches or engaging in any new line of business, except in accordance with an accepted capital restoration plan or with the approval of the FDIC. Institutions that are undercapitalized and either fail to submit an acceptable capital restoration plan or fail to implement an approved capital restoration plan may be subject to a number of requirements and restrictions, including orders to sell sufficient voting stock to become adequately capitalized, requirements to reduce total assets and cessation of receipt of deposits from correspondent banks.

Significantly undercapitalized depository institutions may be subject to a number of requirements and restrictions, including orders to sell sufficient voting stock to become adequately capitalized, requirements to reduce total assets, and cessation of receipt of deposits from correspondent banks. Critically undercapitalized depository institutions are subject to appointment of a receiver or conservator.

13

The appropriate federal banking agency may, under certain circumstances, reclassify a well-capitalized insured depository institution as adequately capitalized. The FDIA provides that an institution may be reclassified if the appropriate federal banking agency

14

determines (after notice and opportunity for hearing) that the institution is in an unsafe or unsound condition or deems the institution to be engaging in an unsafe or unsound practice. The appropriate agency is also permitted to require an adequately capitalized or undercapitalized institution to comply with the supervisory provisions as if the institution were in the next lower category (but not treat a significantly undercapitalized institution as critically undercapitalized) based on supervisory information other than the capital levels of the institution. An institution may be downgraded to, or deemed to be in, a capital category that is lower than indicated by its capital ratios if it is determined to be in an unsafe or unsound condition or if it receives an unsatisfactory examination rating with respect to certain matters.

As part of the adoption of ASU 2016-13, the Company has elected to opt into the regulators’ joint CECL transition provision, which allows the Company to phase in the capital impact of the adoption of CECL over the next three years beginning January 1, 2022. Accordingly, capital ratios as of December 31, 2021,2022 reflect 25% of the CECL impact. As of December 31, 2022, our bank was considered “well capitalized” with a Tier 1 capital ratio of 12.38%11.27%, total capital ratio of 13.38%12.34%, Tier 1 leverage ratio of 10.87%10.67%, and a CET1 capital ratio of 12.38%11.27%, as calculated under Basel III. For more information on these financial measures at the Company and Byline Bank, see Note 2120 of the notes to our audited consolidated financial statements contained in Item 8 of this report.

Safety and Soundness Standards

The FDIA requires the federal banking agencies to prescribe standards, by regulations or guidelines, relating to internal controls, information systems and internal audit systems, loan documentation, credit underwriting, interest rate risk exposure, asset growth, asset quality, earnings, stock valuation and compensation, fees and benefits, and such other operational and managerial standards as the agencies deem appropriate. The federal banking agencies have adopted the Interagency Guidelines for Establishing Standards for Safety and Soundness. The guidelines establish general standards relating to internal controls and information systems, internal audit systems, loan documentation, credit underwriting, interest rate exposure, asset growth, asset quality, earnings and compensation, fees and benefits. In general, these guidelines require, among other things, appropriate systems and practices to identify and manage the risk and exposures specified in the guidelines. These guidelines also prohibit excessive compensation as an unsafe and unsound practice and describe compensation as excessive when the amounts paid are unreasonable or disproportionate to the services performed by an executive officer, employee, director or principal stockholder. In addition, the agencies adopted regulations that authorize, but do not require, an agency to order an institution that has been given notice by an agency that it is not satisfying any of such safety and soundness standards to submit a compliance plan. If, after being so notified, an institution fails to submit an acceptable compliance plan or fails in any material respect to implement an acceptable compliance plan, the banking regulator must issue an order directing action to correct the deficiency and may issue an order directing other actions of the types to which an undercapitalized institution may be subject under the FDIA. See Item 1. “Business—Supervision and Regulation—Prompt Corrective Action Framework”. If an institution fails to comply with such an order, the banking regulator may seek to enforce such order in judicial proceedings and to impose civil money penalties.

Deposit Insurance

FDIC insurance assessments

As an FDIC-insured bank, our bank must pay deposit insurance assessments to the FDIC based on its average total assets minus its average tangible equity. Deposits are insured up to applicable limits by the FDIC and such insurance is backed by the full faith and credit of the United States Government.

As an institution with less than $10 billion in assets, our bank’s assessment rates are based on the level of risk it poses to the FDIC’s deposit insurance fund (“DIF”). Pursuant to changes adopted by the FDIC that were effective July 1, 2016, the initial base rate for deposit insurance is between three and 30 basis points. Total base assessment after possible adjustments now ranges between 1.5 and 40 basis points. For established smaller institutions, like Byline Bank, supervisory ratings are used along with (i) an initial base assessment rate, (ii) an unsecured debt adjustment (which can be positive or negative), and (iii) a brokered deposit adjustment, to calculate a total base assessment rate. We are generally unable to control the amount of deposit insurance assessments that we are required to pay the FDIC. At least semi-annually, the FDIC will update its loss and income projections for the DIF and, if needed, will increase or decrease assessment rates, following notice-and-comment rulemaking, if required.

The limit on FDIC deposit insurance is $250,000. The coverage limit is per depositor, per insured depository institution for each account ownership category. The minimum DIF reserve ratio is 1.35% of estimated insured deposits. Under the FDIA, the FDIC may terminate deposit insurance upon a finding that an institution has engaged in unsafe and unsound practices, is in an unsafe or unsound condition to continue operations or has violated any applicable law, regulation, rule, order or condition imposed by the FDIC.

On October 18, 2022, the FDIC issued a notice of proposed rulemaking, applicable to all insured depository institutions, to increase initial base deposit insurance assessment rates by 2 basis points, beginning with the first quarterly assessment period of 2023. The stated purpose of the increase in deposit insurance assessment rates is to increase the likelihood that the Designated Reserve Ratio (“DRR”) of the DIF reaches the statutory minimum of 1.35% by the statutory deadline of September 30, 2028. The proposed assessment rate schedules would remain in effect unless and until the reserve ratio meets or exceeds 2% in order to support growth in the DIF in progressing toward the FDIC's long-term goal of a 2% DRR.

15

Other assessments

All Illinois state-chartered banks are required to pay supervisory assessments to the IDFPR to fund the operations of that agency. The amount of the assessment is calculated on the basis of Byline Bank’s total assets.

The Volcker Rule

The Dodd-Frank Act, pursuant to a statutory provision commonly called the “Volcker Rule”, prohibits banks and their affiliates from engaging in proprietary trading and investing in and sponsoring hedge funds and private equity funds. The Volcker Rule became effective in July 2015. On July 9, 2019, pursuant to the Consumer Protection Act, the federal banking regulators issued a final rule to

14

exempt community banks that have total assets of $10 billion or less and total consolidated trading assets and liabilities equal to or less than 5% of total consolidated assets from the Volcker Rule. Although we and Byline Bank qualify for exemption under the final rule, the Volcker Rule would not significantly affect the operations of us and our subsidiaries, as we do not have any significant engagement in the businesses covered by the Volcker Rule.

Depositor Preference

The FDIA provides that, in the event of the “liquidation or other resolution” of an insured depository institution, the claims of depositors of the institution, including the claims of the FDIC as subrogee of insured depositors, and certain claims for administrative expenses of the FDIC as a receiver, will have priority over other general unsecured claims against the institution. If an insured depository institution fails, insured and uninsured depositors, along with the FDIC, will have priority in payment ahead of unsecured, non-deposit creditors, including depositors whose deposits are payable only outside of the United States and the parent bank holding company, with respect to any extensions of credit they have made to such insured depository institution.

Interstate Branching

Illinois state-chartered banks, such as Byline Bank, have the authority under Illinois law to establish branches anywhere in the State of Illinois, subject to receipt of all required regulatory approvals.

Federal law permits state and national banks to merge with banks in other states subject to: (i) regulatory approval; (ii) federal and state deposit concentration limits; and (iii) any state law limitations requiring the merging bank to have been in existence for a minimum period of time (not to exceed five years) prior to the merger. The establishment of new interstate branches or the acquisition of individual branches of a bank in another state (rather than the acquisition of an out-of-state bank in its entirety) has historically been permitted only in those states the laws of which expressly authorize such expansion. However, the Dodd-Frank Act permits well-capitalized and well-managed banks to establish new branches across state lines without these impediments.

Consumer Financial Protection

We are subject to a number of federal and state consumer protection laws that extensively govern our relationship with our customers. These laws include the Equal Credit Opportunity Act (“ECOA”), the Fair Credit Reporting Act, the Truth in Lending Act (“TILA”), the Truth in Savings Act, the Electronic Fund Transfer Act, the Expedited Funds Availability Act, the Home Mortgage Disclosure Act, the Fair Housing Act, the Real Estate Settlement Procedures Act, the Fair Debt Collection Practices Act, the Fair Credit Reporting Act, the Service Members Civil Relief Act, the Right to Financial Privacy Act, the Telephone Consumer Protection Act, the CAN-SPAM Act, and these laws’ respective state-law counterparts, as well as state usury laws and laws regarding unfair and deceptive acts and practices. These and other federal laws, among other things, require disclosures of the cost of credit and terms of deposit accounts, provide substantive consumer rights, prohibit discrimination in credit transactions, regulate the use of credit report information, provide financial privacy protections, restrict our ability to raise interest rates on extensions of credit and subject us to substantial regulatory oversight. Violations of applicable consumer protection laws can result in significant potential liability from litigation brought by customers, including actual damages, restitution and attorneys’ fees. Federal banking regulators, state attorneys general and state and local consumer protection agencies may also seek to enforce consumer protection requirements and obtain these and other remedies, including regulatory sanctions, customer rescission rights, action by the state and local attorneys general in each jurisdiction in which we operate and civil money penalties. Failure to comply with consumer protection requirements may also result in our failure to obtain any required bank regulatory approval for merger or acquisition transactions we may wish to pursue or our prohibition from engaging in such transactions even if approval is not required.

The Consumer Financial Protection Bureau (“CFPB”), has broad rulemaking, supervisory and enforcement powers under various federal consumer financial protection laws with respect to certain consumer financial products and services, including the ability to require reimbursements and other payments to customers for alleged legal violations. The CFPB has the authority to impose significant penalties, as well as injunctive relief that prohibits lenders from engaging in allegedly unlawful practices. The CFPB is also authorized to engage in consumer financial education, track consumer complaints, request data and promote the availability of financial services to underserved consumers and communities. Although all institutions are subject to rules adopted by the CFPB and examination by the CFPB in conjunction with examinations by the institution’s primary federal regulator, the CFPB has primary examination and enforcement authority over banks with assets of $10 billion or more. The FDIC has primary responsibility for examination of our bank and enforcement with respect to various federal consumer protection laws so long as our bank has total consolidated assets of less than $10 billion, and state authorities are responsible for monitoring our compliance with all state consumer laws. The CFPB also has the authority to require reports from institutions with less than $10 billion in assets, such as our bank, to support the CFPB in implementing

16

federal consumer protection laws, supporting examination activities, and assessing and detecting risks to consumers and financial markets.

The consumer protection provisions of the Dodd-Frank Act and the examination, supervision and enforcement of those laws and implementing regulations by the CFPB have created a more intense and complex environment for consumer finance regulation. The CFPB has significant authority to implement and enforce federal consumer finance laws, including the TILA and the ECOA.

The CFPB has broad rulemaking authority for a wide range of consumer financial laws that apply to all banks including, among other things, the authority to prohibit “unfair, deceptive, or abusive” acts and practices. Abusive acts or practices are defined in the Dodd-Frank Act as those that (1) materially interfere with a consumer’s ability to understand a term or condition of a consumer financial product or service, or (2) take unreasonable advantage of a consumer’s (a) lack of financial savvy, (b) inability to protect herself or

15

himself in the selection or use of consumer financial products or services, or (c) reasonable reliance on a covered entity to act in the consumer’s interests. The review of products and practices to prevent such acts and practices is a continuing focus of the CFPB, and of banking regulators more broadly. The ultimate impact of this heightened scrutiny is uncertain but it could result in changes to pricing, practices, products and procedures. It could also result in increased costs related to regulatory oversight, supervision and examination, additional remediation efforts and possible penalties. The Dodd-Frank Act does not prevent states from adopting stricter consumer protection standards. State regulation of financial products and potential enforcement actions could also adversely affect our business, financial condition or results of operations.

Federal Home Loan Bank Membership

Byline Bank is a member of the Federal Home Loan Bank of Chicago (“FHLB”), which serves as a central credit facility for its members. The FHLB is funded primarily from proceeds from the sale of obligations of the FHLB system. It makes loans to member banks in the form of FHLB advances. All advances from the FHLB are required to be fully collateralized as determined by the FHLB.

Ability-To-Pay Rules and Qualified Mortgages

As required by the Dodd-Frank Act, the CFPB issued a series of final rules amending Regulation Z, implementing TILA, which requires mortgage lenders to make a reasonable and good faith determination, based on verified and documented information, that a consumer applying for a residential mortgage loan has a reasonable ability to repay the loan according to its terms. These rules prohibit creditors, such as Byline Bank, from extending residential mortgage loans without regard for the consumer’s ability to repay and add restrictions and requirements to residential mortgage origination and servicing practices. In addition, these rules restrict the imposition of prepayment penalties and restrict compensation practices relating to residential mortgage loan origination.

On April 27, 2021, the CFPB issued two new rules that would modify qualified mortgage loan requirements and provide flexibility to banks and other lenders in determining consumers’ ability-to-repay. Compliance with these rules was required by October 1, 2022. Byline Bank complies with, and will continue with, all applicable qualified mortgage loan requirements.

Commercial Real Estate Guidance

In December 2015, the federal banking regulators released a statement entitled “Interagency Statement on Prudent Risk Management for Commercial Real Estate Lending” (the “CRE Guidance”). In the CRE Guidance, the federal banking regulators (i) expressed concerns with institutions that ease commercial real estate underwriting standards, (ii) directed financial institutions to maintain underwriting discipline and exercise risk management practices to identify, measure and monitor lending risks, and (iii) indicated that they will continue to pay special attention to commercial real estate lending activities and concentrations going forward. The federal banking regulators previously issued guidance in December 2006, entitled “Interagency Guidance on Concentrations in Commercial Real Estate Lending, Sound Risk Management Practices”, which stated that an institution is potentially exposed to significant commercial real estate concentration risk, and should employ enhanced risk management practices, where (1) total commercial real estate loans represent 300% or more of its total capital and (2) the outstanding balance of such institution’s commercial real estate loan portfolio has increased by 50% or more during the prior 36 months.

Leveraged Lending Guidance

The federal banking regulators have jointly issued guidance on leveraged lending that updates and replaces prior guidance for leveraged finance activities. The revised leveraged lending guidance describes regulatory expectations for the sound risk management of leveraged lending activities, including the importance for institutions to maintain, among other things, (i) a credit limit and concentration framework consistent with the institution’s risk appetite, (ii) underwriting standards that define acceptable leverage levels, (iii) strong pipeline management policies and procedures and (iv) guidelines for conducting periodic portfolio and pipeline stress tests.

Community Reinvestment Act of 1977

Under the CRA, our bank has an obligation, consistent with safe and sound operations, to help meet the credit needs of the market areas where it operates, which includes providing credit to low- and moderate-income individuals and communities. In connection with its examination of our bank, the FDIC is required to assess our bank’s compliance with the CRA. Our bank’s failure to comply with the CRA could, among other things, result in the denial or delay of certain corporate applications filed by us or our bank, including applications for branch openings or relocations and applications to acquire, merge or consolidate with another banking institution or holding company. Our bank received a rating of “Satisfactory” in its most recently completed CRA examination which is dated December 1, 2019.August 15, 2022.

17

On June 5, 2020,July 20, 2021, the Office of the Comptroller of the Currency ("OCC") published a final rule which would have comprehensively amended and modernized how banks received credit under the CRA in serving low- and moderate-income individuals and communities; however, the OCC rescinded this rule effective as of December 14, 2021. The OCC, FDIC and the FRB also issued a joint statement on July 20, 2021 committing to work together to strengthen and modernize the CRA rules. On May 5, 2022, the OCC, FDIC and FRB issued an Advanced Notice of Proposed Rulemaking with the goals of (i) expanding access to credit, investment and basic banking services in low- and moderate-income communities, (ii) adapting to changes in the banking industry, including internet and mobile banking, (iii) providing greater clarity, consistency and transparency, (iv) tailoring CRA evaluation and data collection to bank size and type, and (v) maintaining a unified approach. However, these agencies have not yet issued a new proposed rule. At this time, we are unable to determine what impact, if any, potential CRA reform may have on the operations of Byline Bank.

Financial Privacy

The federal banking regulators have adopted rules limiting the ability of banks and other financial institutions to disclose non-public information about consumers to unaffiliated third parties. These limitations require disclosure of privacy policies to consumers

16

and, in some circumstances, allow consumers to prevent disclosure of certain personal information to an unaffiliated third party. These regulations affect how consumer information is transmitted through diversified financial companies and conveyed to outside vendors.

Anti-Money Laundering and the USA PATRIOT Act

A major focus of governmental policy on financial institutions in recent years has been combating money laundering and terrorist financing. The Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001, or the USA PATRIOT Act, substantially broadened the scope of United States anti money laundering laws and regulations by imposing significant new compliance and due diligence obligations, creating new crimes and penalties and expanding the extra-territorial jurisdiction of the United States in these areas: customer identification programs, money laundering, terrorist financing, identifying and reporting suspicious activities and currency transactions, currency crimes, and cooperation between financial institutions and law enforcement authorities. The U.S. Treasury Department’s Financial Crimes Enforcement Network ("FinCEN"), among other federal agencies, also promulgates rules and regulations regarding the USA PATRIOT Act with which financial institutions are required to comply. Financial institutions are prohibited from entering into specified financial transactions and account relationships and must use enhanced due diligence procedures in their dealings with certain types of high-risk customers and implement a written customer identification program. Financial institutions must take certain steps to assist government agencies in detecting and preventing money laundering and report certain types of suspicious transactions. Regulatory authorities routinely examine financial institutions for compliance with these obligations, and failure of a financial institution to maintain and implement adequate programs to combat money laundering and terrorist financing, or to comply with all of the relevant laws or regulations, could have serious legal and reputational consequences for the institution, including causing applicable bank regulatory authorities not to approve merger or acquisition transactions when regulatory approval is required or to prohibit such transactions even if approval is not required. Regulatory authorities have imposed cease and desist orders and significant civil money penalties against institutions found to be violating these obligations and have in some cases brought criminal actions against some institutions for these types of violations.

Recently, onOn January 1, 2021, Congress passed the Corporate Transparency Act as part of the National Defense Authorization Act, which enacted the most significant overhaul of the anti-money laundering laws since the USA PatriotPATRIOT Act. Notable amendments include (i) significant changes to the collection of beneficial ownership information and the establishment of a beneficial ownership registry, which requires corporate entities (generally, any corporation, limited liability company, or other similar entity with 20 or fewer employees and annual gross income of $5 million or less) to report beneficial ownership information to FinCEN (which will be maintained by FinCEN and made available upon request to financial institutions); (ii) enhanced whistleblower provisions, which provide that one or more whistleblowers who voluntarily provide original information leading to the successful prosecution of violations of the anti-money laundering laws in any judicial or administrative action brought by the Secretary of the Treasury or the U.S. Attorney General resulting in monetary sanctions exceeding $1 million (including disgorgement and interest but excluding forfeiture, restitution, or compensation to victims) will receive not more than 30 percent30% of the monetary sanctions collected and will receive increased protections; (iii) increased penalties for violations of anti-money laundering laws and regulations; (iv) improvements to existing information sharing provisions that permit financial institutions to share information relating to suspicious activity reports with foreign branches, subsidiaries, and affiliates (except those located in China, Russia, or certain other jurisdictions) for the purpose of combating illicit finance risks; and (v) expanded duties and enforcement powers for FinCEN. Many of the amendments, including those with respect to beneficial ownership, require FinCEN to promulgate rules. On December 7, 2021September 29, 2022, FinCEN issuedfinalized the first of three proposed rules to implement changes to the beneficial ownership requirements and related amendments set forth in the Corporate Transparency Act. The final rule prescribes which corporate entities created in or registered to do business in the U.S. will be required to report beneficial ownership information directly to FinCEN. The rule is effective and compliance is required on January 1, 2024. On December 15, 2022, FinCEN issued a second proposed rule to establish and manage access to beneficial ownership information that FinCEN will collect and maintain once all three rules are finalized. At this time, due to the fact that two of the other twoproposed rules have not yet been finalized and issued, respectively, we are unable to determine what impact, if any, the finalized rules may have on the operations of Byline Bank.

Office of Foreign Assets Control Regulation

The U.S. Treasury Department’s Office of Foreign Assets Control, or OFAC, under authority of various laws, administers and enforces economic and trade sanctions against targeted foreign countries and regimes, including designated foreign countries, nationals and others. OFAC publishes lists of specially designated targets and countries. We and our bank are responsible for, among other things, blocking accounts of, and transactions with, such targets and countries, prohibiting unlicensed trade and financial transactions with them

18

and reporting blocked transactions after their occurrence. Failure to comply with these sanctions could have serious legal and reputational consequences and could result in civil money penalties imposed on the institution by OFAC. Failure to comply with these sanctions could also cause applicable bank regulatory authorities not to approve merger or acquisition transactions when regulatory approval is required or to prohibit such transactions even if approval is not required.

17

Cybersecurity

In March 2015, federal regulators issued two related statements regarding cybersecurity. One statement indicates that financial institutions should design multiple layers of security controls to establish lines of defense and to ensure that their risk management processes also address the risk posed by compromised customer credentials, including security measures to reliably authenticate customers accessing internet-based services of the financial institution. The other statement indicates that a financial institution’s management is expected to maintain sufficient business continuity planning processes to ensure the rapid recovery, resumption and maintenance of the institution’s operations after a cyber-attackcyberattack involving destructive malware. A financial institution is also expected to develop appropriate processes to enable recovery of data and business operations and address rebuilding network capabilities and restoring data if the institution or its critical service providers fall victim to this type of cyber-attack.cyberattack. If we fail to observe the regulatory guidance, we could be subject to various regulatory sanctions, including financial penalties.

In November 2021, the federal regulators finalized a rule concerning notification requirements for banks related to significant computer security incidents. Under the final rule, a bank or its bank holding company is required to notify its applicable federal banking regulators within 36 hours of incidents that have materially disrupted or degraded, or are reasonably likely to materially disrupt or degrade, the banking organization’s ability to deliver services to a material portion of its customer base, jeopardize the viability of key operations of the organization, or impact the stability of the financial sector. The rule iswas effective April 1, 2022 withand compliance was required by May 1, 2022.

In the ordinary course of business, we rely on electronic communications and information systems to conduct our operations and to store sensitive data. We employ an in-depth, layered, defensive approach that leverages people, processes and technology to manage and maintain cybersecurity controls. We employ a variety of preventative and detective tools to monitor, block, and provide alerts regarding suspicious activity, as well as to report on any suspected advanced persistent threats. Notwithstanding the strength of our defensive measures, the threat from cyberattacks is severe, attacks are sophisticated and increasing in volume, and attackers respond rapidly to changes in defensive measures. While to-date we have not experienced a significant compromise, significant data loss or any material financial losses related to cybersecurity attacks, our systems and those of our customers and third party service providers are under constant threat and it is possible that we could experience a significant event in the future. Risks and exposures related to cybersecurity attacks are expected to remain high for the foreseeable future due to the rapidly evolving nature and sophistication of these threats, as well as due to the expanding use of internet banking, mobile banking and other technology-based products and services by us and our customers.

Legislative and Regulatory Responses to the COVID-19 Pandemic

The COVID-19 pandemic has created extensive disruptions to the global economy. There have been a number of regulatory actions undertaken by the bank regulatory agencies intended to help mitigate the adverse economic impact of the COVID-19 pandemic on borrowers, including several rules from the bank regulatory agencies requiring financial institutions to work constructively with borrowers affected by the COVID-19 pandemic. Most of these regulatory actions, along with other government programs that were designed to assist impacted individuals and companies, are no longer applicable; however, we will continue to monitor for any additional regulatory actions that may be taken by the bank regulatory agencies in the future in response to the pandemic and ensure that we address any such applicable regulatory actions.

Future Legislation and Regulation

Congress may enact legislation from time to time that affects the regulation of the financial services industry, and state legislatures may enact legislation from time to time affecting the regulation of financial institutions chartered by or operating in those states. Federal and state regulatory agencies also periodically propose and adopt changes to their regulations or change the manner in which existing regulations are applied. The substance or impact of pending or future legislation or regulation, or the application thereof, cannot be predicted, although enactment of the proposed legislation could affect the regulatory structure under which we operate and may significantly increase our costs, impede the efficiency of our internal business processes, require us to increase our regulatory capital or modify our business strategy, or limit our ability to pursue business opportunities in an efficient manner. Our business, financial condition, results of operations or prospects may be adversely affected, perhaps materially, as a result.

Information About Our Executive Officers

The following list sets forth the name, current age, principal position and recent business experience of each of our executive officers:

Thomas Abraham, 56,57, became President of Byline Bank’s Small Business Capital (“SBC”) line of business in May 2019. Mr. Abraham previously served as Senior Vice President, SBA Sales Manager of SBC since October 2016.

John M. Barkidjija, 58,59 became Executive Vice President and Head of Commercial Real Estate and Specialty Finance of Byline Bank in January 2019. Mr. Barkidjija previously served as Senior Vice President, Group Head, Commercial Real Estate of Byline Bank since January 2014.

Thomas J. Bell III, 55, is Senior56, became Executive Vice President and Chief Financial Officer of Byline and Byline Bank in September 2022. Mr. Bell has been serving as Corporate Treasurer of Byline Bank since August 2013.

Megan Biggam, 43,44, became Executive Vice President of Retail Banking of Byline Bank in February 2020. Ms. Biggam previously served as Senior Vice President of Retail Banking of Byline Bank since June 2013.

18

Ana Casanueva, 38,39, became Senior Vice President and Director of Legal of Byline and Byline Bank in June 2021. Ms. Casanueva previously served as Associate General Counsel of Byline Bank since 2019, and as Corporate Development Officer from 2013 to 2019.

Lindsay Corby, 43, is Executive Vice President and Chief Financial Officer of Byline and Byline Bank since July 2015.19

Mark Fucinato, 65,66, became Executive Vice President and Chief Credit Officer for Byline and Byline Bank in August 2020. He previously served as Senior Vice President and Senior Credit Officer of Byline Bank since August 2019. Prior to that, Mr. Fucinato served as Senior Credit Officer at MB Financial Bank from 2016 to 2019.

Angela Hart, 47,48, became Executive Vice President and Head of Wealth Management and Trust in August 2021. Prior to that, Ms. Hart served as Senior Vice President and Wealth Strategist at Northern Trust.

Roberto R. Herencia, 62,63, became Chairman of Byline Bancorp, Inc. and Byline Bank in June 2013, and Executive Chairman and Chief Executive Officer in February, 2021. He serves as a member of the Board of Director’s risk, executive credit, trust, and Asset-Liability Committee (‘‘ALCO’’) committees of Byline Bank.

Michelle Johnson, 40,41, became SeniorExecutive Vice President and Chief Risk Officer of Byline Bank in October 2019. Prior to that, Ms. Johnson served as Deputy Chief Risk Officer since 2018. Ms. Johnson joined Byline Bank in 2015 as Director of IT Risk Management.Management.

Nicolas Mando, 50,51, became Senior Vice President and Chief Technology and Operations Officer of Byline Bank in November 2021. He served as Director of Special Projects of Byline Bank since 2019. Prior to that, Mr. Mando served as Chief Operating Officer at Bridgeview Bank since 2009.

Sherylle Olano, 45, became Senior Vice President and Chief Accounting Officer of Byline and Byline Bank in September 2022. Prior to that, Ms. Olano previously served as Controller since 2014.

Alberto J. Paracchini, 51,52, is President and a Director of Byline Bancorp, Inc. and Chief Executive Officer, President and a Director of Byline Bank. He joined Byline in June 2013.

Brogan Ptacin, 61,62, became Executive Vice President and Head of Commercial Banking for Byline Bank in January 2019. Prior to that, Mr. Ptacin served as a Managing Director of First Bank & Trust since 2009 until First Bank & Trust was acquired by Byline in 2018.

Dana Traci, 52,Rose, 53, became Executive Vice President and Chief Human Resources Officer of Byline Bank in November 2019. Prior to that, Ms. TraciRose served as Interim Chief Human Resources Officer for Discover Financial Services and held various other roles at Discover since 1994.

Item 1A. Risk Factors.

The material risks and uncertainties that management believes affect us are described below. You should carefully consider these risks, together with all of the information included herein. Any of the following risks, as well as risks that we do not know or currently deem immaterial, could have a material adverse effect on our business, financial condition, or results of operations.

Risks Related to Our Business

Credit and Interest Rate Risks

Our business depends on our ability to successfully manage credit risk.

The operation of our business requires us to manage credit risk. As a lender, we are exposed to the risk that our borrowers willmay be unable to repay their loans and leases according to their terms, and that the collateral securing repayment of their loans or leases, if any, may not be sufficient to ensure repayment. In addition, there are risks inherent in making any loan or lease, including risks with respect to the period of time over which the loan or lease may be repaid, risks relating to proper loan or lease underwriting, risks resulting from changes in economic and industry conditions and risks inherent in dealing with individual borrowers, including the risk that a borrower may not provide information to us about its business in a timely manner, and/or may present inaccurate or incomplete information to us, and risks relating to the value of collateral. In order to manage credit risk successfully, we must, among other things, maintain disciplined and prudent underwriting standards. The weakening of these standards for any reason, a lack of discipline or diligence in underwriting and monitoring loans and leases, the inability to adequately adapt policies and procedures to changes in economic or any other conditions affecting borrowers and the quality of our loan and lease portfolio, may result in defaults, foreclosures and additional charge-offs and may necessitate that we significantly increase our allowance for loancredit losses - loans and lease losses,leases, each of which could adversely affect our net income. As a result, our inability to successfully manage credit risk could have a material adverse effect on our business, financial condition, or results of operations.

We may underestimate the credit losses inherent in our loan and lease portfolio and have credit losses in excess of the amount we provide for loan and lease losses.

The credit quality of our loan and lease portfolio can have a significant impact on our earnings. We maintain an allowance for loan and leasecredit losses, which is a reserve established through a provision charged to expense representing management’s estimate of probable losses that may be incurred within our existing portfolio of loans and leases.current expected credit losses. The allowance, in the judgment of management, is necessary to reserve for probable incurredcurrent expected losses and risks inherent in our loan and lease portfolio. The level of the allowance reflects

19

management’s continuing evaluation of specific credit risks; the quality of the portfolio; the value of the underlying collateral; the level of non-accruing loans and leases; incurredcurrent expected losses inherent in the current portfolio; and economic, political, and regulatory conditions. OurManagement estimates the allowance methodology includes the use of both actual historical loss data on loans made by Byline Bank as well as industrybalance using relevant available information from internal and peer data,external sources relating to past events, current conditions, and reasonable and supportable

20

forecasts, which could increase the subjectivity of the calculation. This process, which is critical to our financial results and condition, requires difficult, subjective and complex judgments. In accordance with accounting principles generally accepted in the United States of America (“GAAP”) for business combination accounting, the loans acquired through our recapitalization and our subsequent bank acquisitions wereare recorded at their estimated fair value. Therefore, there was novalue, and an allowance for loancredit losses associated with those loans at acquisition. Management continues to evaluate the allowance needed on the acquired loans, which includes considering the remaining net acquisition accounting adjustment ($4.8 million at December 31, 2021).also recorded.

Although we believe our allowance for loan and leasecredit losses is adequate to absorb probable and reasonably estimablecurrent expected losses in our loan and lease portfolio, it may not be sufficient. We could sustain credit losses that are significantly higher than the amount of our allowance as a result of a variety of reasons, such as changes in economic conditions affecting borrowers, new information and other factors within and outside our control. If real estate values were to decline or if economic conditions in our markets were to deteriorate unexpectedly, additional losses not incorporated in the existing allowance might occur. Losses in excess of the existing allowance will reduce our net income and could have a material adverse effect on our business, financial condition, or results of operations. A severe downturn in the economy generally, in our markets specifically, or affecting the business and assets of individual customers, would generate increased charge-offs and a need for higher provision for loan and leasecredit losses.

We may also be required to take additional provisions for loan and leasecredit losses in the future to further supplement the allowance due to requirements by our banking regulators. Bank regulatory agencies periodically review our allowance, the policies and procedures we use to determine the level of the allowance and the value attributed to non-performing loans or to real estate acquired through foreclosure. Such regulatory agencies may require us to make further provisions or recognize future charge-offs. Further, charge-offs in future periods that exceed the allowance would require an increase to increase the allowance.

Any increases in our provision for loan and leasecredit losses will result in a decrease in net income and may reduce retained earnings and capital and, therefore, have a material adverse effect on our business, financial condition and results of operations.

The FASB has recently issued an accounting standard update that will result in a significant change in how we recognize credit losses and may have a material impact on our financial condition or results of operations.

In June 2016, the Financial Accounting Standards Board (the “FASB”("FASB") issued an accounting standard update, “Financial Instruments-CreditAccounting Standards Update ("ASU") No. 2016‑13, Financial Instruments - Credit Losses (Topic 326), Measurement on the recognition of Credit Losses on Financial Instruments” that will replacecredit losses, otherwise known as the current approach under GAAP for establishing allowances for loan and lease losses,expected credit loss model or "CECL", which generally considers only past events and current conditions,replaces the incurred loss impairment methodology with a forward-looking methodology referredthat reflects current expected credit losses. As an emerging growth company, we elected to delay the adoption of the standard in accordance with ASU No. 2019-10, Effective Dates, which delayed the effective date of the ASU for entities not classified as Public Business Entities. The Company’s EGC status expired on December 31, 2022, requiring CECL adoption be reflected in our December 31, 2022 financial statements and Form 10-K. The Company adopted CECL on December 31, 2022, and has applied it retroactively to the Current Expected Credit Loss (“CECL”). Seeperiod beginning January 1, 2022 using the modified retrospective method of accounting. Cumulative adjustments related to adoption were made to capital and are disclosed in Note 2 of the notes to our audited consolidated financial statements contained in Item 8 of this report for additional information about the standard.report.

We also expect to incur transition and ongoing costs in developing and implementing the CECL methodology. We cannot yet determine the magnitude of any such one-time cumulative adjustment or of the overall impact of the new standard on our financial condition or results of operations.21

Our business is subject to interest rate risk and fluctuations in interest rates may adversely affect our earnings.

Fluctuations in interest rates may negatively affect our business and may weaken demand for some of our products. Our earnings and cash flows are largely dependent on net interest income, which is the difference between the interest income that we earn on interest-earning assets, such as investment securities, loans, and leases, the interest expense that we pay on interest-bearing liabilities, such as deposits and borrowings. Additionally, changes in interest rates also affect the premiums we may receive in connection with the sale of U.S. government guaranteed loans in the secondary market, pre-payment speeds of loans for which we own servicing rights, our ability to fund our operations with customer deposits, and the fair value of securities in our investment portfolio. Therefore, any change in general market interest rates can have a significant effect on our net interest income and results of operations.

We seek to mitigate our interest rate risk by entering into interest rate swaps and other interest rate derivative contracts from time to time with counterparties. Our hedging strategies rely on assumptions and projections regarding interest rates, asset levels, and general market factors and subject us to counterparty risk. There is no assurance that our interest rate mitigation strategies will be successful, and if our assumptions and projections prove to be incorrect or our hedging strategies do not adequately mitigate the impact of changes in interest rates, we may incur losses that could adversely affect our earnings.

Our interest-earning assets and interest-bearing liabilities may react in different degrees to changes in market interest rates. Interest rates on some types of assets and liabilities may fluctuate prior to changes in broader market interest rates, while rates on other types of assets and liabilities may lag. The result of these changes to rates may cause differing spreads on interest-earning assets and interest-bearing liabilities. Although we take measures intended to manage the risks from changes in market interest rates, we cannot control or accurately predict changes in market rates of interest or be sure our protective measures are adequate.

As of December 31, 2021,2022, we had $2.2$2.1 billion of non-interest-bearing demand deposits and $572.4$592.1 million of interest-bearing checking accounts. CurrentAs the Federal Reserve raised its overnight target from nearly zero at the beginning of the year to a range of 4.25% to 4.50% at December 31, 2022, we have cautiously managed our deposit repricing strategies to seek to expand our net interest margin by keeping deposit rates at relatively low levels. As the competition for interest-bearing accounts are low duefunding among banks increases, and customers move money to current market conditions. If a low interest rate environment persists,achieve higher yields, we may be unableneed to increase our net interest income. However, we do not know what market rates will eventually

20

be, especially if the FRB increases interest rates as is currently anticipated.deposit pricing accordingly. To the extent we offer higher interest rates on checking accountstargeted interest-bearing deposit products to maintain current customers or attract new customers, our interest expense will increase, perhaps materially. Furthermore, if we fail to offer interest inrates at a sufficient amountlevel to keep these demand deposits, our core deposits may be reduced, which would require us to obtain funding in other ways or risk slowing our future asset growth.

We may be adversely impacted by the transition from the London Interbank Offered Rate (“LIBOR”) as a reference rate.

On March 5, 2021, the United Kingdom’s Financial Conduct Authority and the Intercontinental Exchange Benchmark Administration announced that the one-week and two-month U.S. dollar LIBOR (“USD LIBOR”) settings would cease to be published immediately after December 31, 2021. The publication of overnight and one-, three-, six‑, and 12-month USD LIBOR settings would be extended through June 30, 2023 to provide additional time for market participants to wind down or modify existing contracts that reference these LIBOR tenors.

In response, the FDIC, the Board of Governors of the Federal Reserve System, and the OCC issued joint guidance directing banks and market participants to cease entering new LIBOR contracts after December 31, 2021,which we have done. Although most LIBOR tenors will continue to be published through June 30, 2023 to aid in the transition of legacy LIBOR contracts (e.g. maturity), as of January 1, 2021, we no longer originate loans indexed to LIBOR nor enter into modifications which create new LIBOR exposure.

During 2021, we began a transition to using a forward-looking term rate based upon the Secured the Overnight Financing Rate ("SOFR"), CME Term SOFR (“Term SOFR”) as the replacement benchmark index in lieu of LIBOR. SOFR is the Alternative Reference Rates Committee’s recommended alternative to USD LIBOR. Because the Term SOFR market continues to develop and deepen, changes in SOFR or Term SOFR or changes in market perceptions of the acceptability of Term SOFR as a benchmark could result in changes to our risk exposures (for example, because SOFR is a broad measurement of the cost borrowing cash secured by U.S. Treasury securities, changes or disruptions in the repo market may adversely affect the availability or cost of floating-rate funding and, therefore, our exposure to fluctuations in interest rates) or otherwise result in losses on a product or having to pay more or receive less on financial instruments that we own or have issued.

Uncertainty as to the nature of other alternative reference rates (i.e. the Bloomberg Short-Term Bank Yield Index, Ameribor) and their broader acceptance by the market may also adversely affect SOFR rates and the value of SOFR-based loans, and to a lesser extent securities in our portfolio, and may impact the availability and cost of hedging instruments and borrowings, including the rates we pay on our subordinated debentures and trust preferred securities.

Such uncertainty may result in pricing volatility and increased capital requirements, accounting impacts, compliance, basis risk, legal and operational costs and risks associated with customer disclosures, discretionary actions taken or negotiation of loan modifications to move from LIBOR to Term SOFR prior to the June 30, 2023 cessation, reduced loan balances if borrowers do not accept the substitute indices we are able provide, systems disruption, business continuity, or model disruption. Finally, if we or other market participants fail to properly plan to implement alternative rates other than LIBOR, it could have an adverse effect on us and the financial system as a whole.

22

Our business, profitability, and liquidity may be adversely affected by deterioration in the credit quality of, or defaults by, third parties who owe us money, securities or other assets or whose securities, or obligations we hold.

In addition to relying on borrowers to repay their loans and leases, we are exposed to the risk that third parties that owe us money, securities, or other assets will not perform their obligations. These parties may default on their obligations to us due to bankruptcy, lack of liquidity, operational failure, or other reasons. A default by a significant market participant, or concerns that such a party may default, could lead to significant liquidity problems, losses, or defaults by other parties, which in turn could adversely affect us.

We are also subject to the risk that our rights against third parties may not be enforceable in all circumstances. Deterioration in the credit quality of third parties whose securities or obligations we hold, including the Federal Home Loan Mortgage Corporation, Government National Mortgage Association and municipalities, could result in significant losses.

We depend on the accuracy and completeness of information about customers and counterparties.

In deciding whether to extend credit or enter into other transactions, and in evaluating and monitoring our loan and lease portfolio on an ongoing basis, we may rely on information furnished by or on behalf of customers and counterparties, including financial statements, credit reports, and other financial information. We may also rely on representations of those customers or counterparties or of other third parties, such as independent auditors, as to the accuracy and completeness of that information. Reliance on inaccurate, incomplete, fraudulent, or misleading financial statements, credit reports or other financial or business information, or the failure to receive such information on a timely basis, could result in loan or lease losses, reputational damage or other effects that could have a material adverse effect on our business, financial condition, or results of operations.

The value of the financial instruments we own may decline in the future.

As of December 31, 2021,2022, we owned $1.5$1.2 billion of investment securities, which consisted primarily of our positions in U.S. government and government-sponsored enterprises and federal agency obligations, mortgage and asset-backed securities and municipal

21

securities. We evaluate our investment securities on at least a quarterly basis, and more frequently when economic and market conditions warrant such an evaluation, to determine whether any decline in fair value below amortized cost is the result of an other-than-temporary impairment.credit losses. The process for determining whether impairment is other-than-temporaryunrealized losses contain credit losses usually requires complex, subjective judgments in order to assess the probability of receiving all contractual principal and interest payments on the security. We may be required to recognize other-than-temporary impairmentcredit losses in future periods, which could adversely affect our business, results of operations or financial condition.

In addition, an increasefurther increases in market interest rates may continue to affect the market value of our securities portfolio, potentially further reducing accumulated other comprehensive income and/or earnings.

Funding Risks

A lack of liquidity could affect operations and jeopardize our business, financial condition, and results of operations.

Liquidity risk is the risk that we will not be able to meet our obligations, including financial commitments, as they come due and is inherent in our operations. An inability to raise funds through deposits, borrowings, the sale of loans and/or investment securities, and from other sources could have a material negative effect on our liquidity. Our most important source of funds consists of our customer deposits. If customers move money out of bank deposits and into other investments, we could lose a relatively low cost source of funds. This loss would require us to seek other funding alternatives in order to continue to grow, thereby increasing our funding costs and reducing our net interest income and net income.

Other primary sources of funds consist of cash from operations and investment maturities, redemptions, and sales, as well as borrowings from the Federal Reserve Bank of Chicago, the FHLB and other third-party lenders from time to time. Our access to funding sources in amounts adequate to finance or capitalize our activities or on terms that are acceptable to us could be impaired by factors that affect us directly or the financial services industry or economy in general, such as disruptions in the financial markets or negative views and expectations about the prospects for the financial services industry.

Any decline in available funding could adversely impact our ability to continue to implement our business plan, which could have a material adverse impact on our liquidity, business, financial condition, and results of operations.

Our liquidity is dependent on dividends from Byline Bank.

We are a legal entity separate and distinct from Byline Bank, our wholly-owned banking subsidiary. A substantial portion of our cash flow from operating activities, comes primarily from dividends we receive from Byline Bank. Various federal and state laws and regulations limit the amount of dividends that the bank may pay to us. As of December 31, 2021,2022, Byline Bank had the capacity to pay Byline Bancorpus dividends of up to $161.7$126.9 million without the need to obtain prior regulatory approval. Also, our right to participate in a distribution of assets upon a subsidiary’s liquidation or reorganization is subject to the prior claims of the subsidiary’s creditors. In the event Byline Bank is unable to pay dividends to us, we may not be able to service our existing debt or any debt we may incur, pay obligations or pay dividends on our common and preferred stock, which could have a material adverse effect on our business, financial condition or results of operations.

23

We may need to raise additional capital in the future, and such capital may not be available when needed or at all.

We may need to raise additional capital, in the form of debt or equity securities, in the future to have sufficient capital resources to meet our commitments and fund our business and future growth, particularly if the quality of our assets or earnings were to deteriorate significantly. Our ability to raise additional capital, if needed, will depend on, among other things, conditions in the capital markets at that time, which are outside of our control, and our financial condition. Further, if we need to raise capital in the future, we may have to do so when many other financial institutions are also seeking to raise capital and would then have to compete with those institutions for investors. An inability to raise additional capital on acceptable terms when needed, or at all, could have a material adverse effect on our business, financial condition or results of operations.

Operational Risks

We may not be able to implement our growth strategy or manage costs effectively, resulting in lower earnings or profitability.

There can be no assurance that we will be able to continue to grow and to be profitable in future periods, or, if profitable, that our overall earnings will remain consistent or increase in the future. Our strategy focuses on organic growth, supplemented by opportunistic acquisitions.

Our growth requires that we increase our loan and deposit growth while managing risks by following prudent loan underwriting standards without increasing interest rate risk or compressing our net interest margin, maintaining more than adequate capital at all times, hiring and retaining qualified employees, and successfully implementing strategic projects and initiatives. Even if we are able to increase our interest income, our earnings may nonetheless be reduced by increased expenses, such as additional employee compensation or other general and administrative expenses and increased interest expense on any liabilities incurred or deposits solicited to fund

22

increases in assets. Additionally, if our competitors extend credit on terms we find to pose excessive risks, or at interest rates which we believe do not warrant the credit exposure, we may not be able to maintain our lending volume and could experience deteriorating financial performance. Our inability to manage our growth successfully or to continue to expand into new markets could have a material adverse effect on our business, financial condition, or results of operations.

New lines of business, products, product enhancements or services may subject us to additional risks.

From time to time, we may implement new lines of business or offer new products and product enhancements as well as new services within our existing lines of business. There are substantial risks and uncertainties associated with these efforts, particularly in instances in which the markets are not fully developed. In implementing, developing, or marketing new lines of business, products, product enhancements or services, we may invest significant time and resources and not realize their expected results or returns. Further, initial timetables for the introduction and development of new lines of business, products, product enhancements or services may not be achieved, and price and profitability targets may not prove feasible. External factors, such as compliance with regulations, competitive alternatives and shifting market preferences, may also affect the ultimate implementation of a new line of business or offerings of new products, product enhancements or services. Furthermore, any new line of business, product, product enhancement or service or system conversion could have a significant impact on the effectiveness of our system of internal controls. Failure to successfully manage these risks in the development and implementation of new lines of business or offerings of new products, product enhancements or services could have a material adverse effect on our business, financial condition, or results of operations.

External Risks

Our business may be adversely affected by conditions in the financial markets and economic conditions generally.

Our financial performance generally, and in particular the ability of our borrowers to pay interest on and repay principal of outstanding loans and leases and the value of collateral securing those loans and leases, as well as demand for loans and leases and other products and services we offer, is highly dependent upon the business environment in the markets in which we operate and in the United States as a whole. Unlike larger banks that are more geographically diversified, we provide banking and financial services to customers primarily in the Chicago metropolitan area. The economic conditions in this local market may be different from, or worse than, the economic conditions in the United States as a whole. Some elements of the business environment that affect our financial performance include short-term and long-term interest rates, the prevailing yield curve, inflation and price levels, tax policy, monetary policy, unemployment, and the strength of the domestic economy and the local economy in the markets in which we operate. Also, the occurrence of other external events, such as geopolitical events and widespread public health emergencies or pandemics may negatively affect the business environment in our markets. Unfavorable market conditions can result in a deterioration in the credit quality of our borrowers and the demand for our products and services, an increase in the number of loan and lease delinquencies, defaults and charge-offs, additional provisions for loan and leasecredit losses and an overall material adverse effect on the quality of our loan and lease portfolio. Unfavorable or uncertain economic and market conditions can be caused by, among other factors, declines in economic growth, business activity or investor or business confidence; limitations on the availability or increases in the cost of credit and capital; changes in inflation

24

or interest rates; increases in real estate and other state and local taxes; high unemployment; natural disasters; geopolitical issues and uncertainty; public health concerns; and other external factors or a combination of these or other factors.

The City of Chicago and State of Illinois currently face significant financial difficulties, which could adversely affect our business.

We have significant loan exposure in the Chicago metropolitan area, and both the City of Chicago and the State of Illinois currently face significant fiscal challenges, including large budget deficits, substantial unfunded pension obligations and low credit ratings compared to other local entities, which could negatively impact us to the extent this leads to declines in business activity and overall economic conditions in Illinois and the Chicago metropolitan area. These fiscal challenges may also lead to significant increases in real estate taxes on properties in the Chicago metropolitan area, which could negatively affect certain of our borrowers’ ability to make payments on our loans.

Some of our commercial loan borrowers are not-for-profit entities that may be dependent on the receipt of contractual payments and reimbursements from the State of Illinois for services rendered. To the extent the City of Chicago or State of Illinois, as applicable, delays or suspends these payments and reimbursements, this could adversely affect the ability of borrowers to meet their loan repayment obligations to us. Any resulting delinquencies and defaults on these loans would in turn adversely affect our financial condition and results of operations.

Our business is significantly dependent on the real estate markets in which we operate, as a significant percentage of our loan portfolio is secured by real estate.

Many of the loans in our portfolio are secured by real estate. As of December 31, 2021,2022, our real estate loans held for investment include $324.2$436.6 million of construction and development loans, $252.9$304.2 million of multifamily loans, $637.1$736.7 million of non-owner occupied CRE loans and $227.6$187.0 million of residential mortgage loans, with the majority of these real estate loans concentrated in the City of Chicago

23

and the State of Illinois. Real property values in our primary market may differ from real property values in other markets where we may do business and may be affected by a variety of factors outside of our control and the control of our borrowers, including national and local economic conditions, generally. The Chicago metropolitan area has experienced volatility in real estate values over the past decade. Declines in real estate values, including prices for homes and commercial properties in the Chicago metropolitan area, could result in a deterioration of the credit quality of our borrowers, an increase in the number of loan delinquencies, defaults and charge-offs, and reduced demand for our products and services, generally. In addition, our appraisal of the property may change significantly in relatively short periods of time and may not accurately describe the fair value of the real property collateral after the loan is made, resulting in loss if we foreclose on the property prior to realizing the full amount of any remaining indebtedness. Our CRE loans may have a greater risk of loss than residential mortgage loans, in part because these loans are generally larger or more complex to underwrite. In particular, real estate construction and acquisition and development loans have certain risks not present in other types of loans, including risks associated with construction cost overruns, project completion risk, general contractor credit risk and risks associated with the ultimate sale or use of the completed construction. In addition, declines in real property values could reduce the value of any collateral we realize following a default on these loans. An increase in the level of non-performing assets increases our risk profile and may affect the capital levels regulators believe are appropriate in light of the ensuing risk profile. In addition, we rely on appraisals and other valuation techniques to establish the value of our other real estate owned (“OREO”) and personal property that we acquire through foreclosure proceedings and to determine certain loan impairments. If any of these valuations are inaccurate, our consolidated financial statements may not reflect the correct value of our OREO, and our allowance for loancredit losses - loans and lease lossesleases may not reflect accurate loan impairments. This could have a material adverse effect on our business, financial condition or results of operations. Our failure to effectively mitigate these risks could have a material adverse effect on our business, financial condition, or results of operations.

Technology Risks

We depend on information technology and telecommunications systems of third parties, and any systems failures, interruptions, or data breaches involving these systems could adversely affect our operations and financial condition.

Our business is highly dependent on the successful and uninterrupted functioning of our information technology and telecommunications systems, third-party servicers, accounting systems, mobile and online banking platforms and financial intermediaries. We outsource to third parties many of our major systems, such as data processing, loan servicing, deposit processing, and internal audit systems. The failure of these systems, or the termination of a third-party software license or service agreement on which any of these systems is based, could interrupt our operations. Because our information technology and telecommunications systems interface with and depend on third-party systems, we could experience service denials if demand for such services exceeds capacity or such third-party systems fail or experience interruptions. If sustained or repeated, a system failure or service denial could result in a deterioration of our ability to operate effectively or service our customers, resulting in potential noncompliance with applicable laws or regulations, loss of customer business, and/or subject us to additional regulatory scrutiny and possible financial liability, any of which could have a material adverse effect on our financial condition. In addition, failure of third parties to comply with applicable laws and regulations, or fraud or misconduct on the part of employees of any of these third parties, could disrupt our operations or adversely affect our reputation.

It may be difficult for us to replace some of our third-party vendors, particularly vendors providing our core banking, debit card services, and information services, in a timely manner if they are unwilling or unable to provide us with these services in the future for any reason, and even if we are able to replace them, it may be at higher cost or result in the loss of customers. Any such events could have a material adverse effect on our business, financial condition, or results of operations.

The occurrence of fraudulent activity, breaches or failures of our information security controls or cybersecurity-related incidents could have a material adverse effect on our business, financial condition, or results of operations.

As a financial institution, we are susceptible to fraudulent activity, information security breaches, and cybersecurity-related incidents that may be committed against us, our customer,customers, or third-party service providers that we utilize, which may result in financial losses or increased costs to us or our customers, disclosure or misuse of our information or our customer information, misappropriation of assets, privacy breaches against our customers, litigation, or damage to our reputation. Information security breaches and cybersecurity-related incidents may include fraudulent or unauthorized access to systems used by us or our customers, denial or degradation of service attacks, and malware or other cyber-attacks.cyberattacks. There continues to be a rise in electronic fraudulent activity, security

25

breaches, and cyber-attackscyberattacks directed at the financial services industry. Consistent with industry trends, we have also experienced an increase in attempted electronic fraudulent activity, security breaches, and cybersecurity-related incidents. Information pertaining to us and our customers is maintained, and transactions are executed, on networks and systems maintained by us and certain third-party partners, such as our online banking or reporting systems. The secure maintenance and transmission of confidential information, as well as execution of transactions over these systems, are essential to protect us and our customers against fraud and security breaches and to maintain our customers’ confidence and privacy. Although we have developed, and continue to invest in, systems and processes that are designed to detect and prevent security breaches and cyber-attackscyberattacks and periodically test our security, our or our third-party partners’ inability to anticipate, or failure to adequately mitigate, breaches of security could result in: losses to us or our customers; our loss of business and/or customers; damage to our reputation; the incurrence of additional expenses; disruption to our business; our inability to

24

grow our online services or other businesses; additional regulatory scrutiny or penalties; or our exposure to civil litigation and possible financial liability-any of which could have a material adverse effect on our business, financial condition, or results of operations.

We continually encounter technological change.

The financial services industry is continually undergoing rapid technological change with frequent introductions of new, technology-driven products and services. Our future success depends, in part, upon our ability to address the needs of our customers by using technology to provide products and services that will satisfy customer demands, as well as to create additional efficiencies in our operations. Many of our competitors have substantially greater resources to invest in technological improvements than we do. We may not be able to effectively implement new, technology-driven products and services, or be successful in marketing these products and services to our customers. In addition, the implementation of technological changes and upgrades to maintain current systems and integrate new ones may also cause service interruptions, transaction processing errors, and system conversion delays, and may cause us to fail to comply with applicable laws. Failure to successfully keep pace with technological change affecting the financial services industry and failure to avoid interruptions, errors, and delays could have a material adverse effect on our business, financial condition, or results of operations.

Guaranteed Loans Risks

Small Business Administration lending and other government guaranteed lending is an important part of our business. Our government guaranteed lending programs are dependent upon the U.S. federal government, and we face specific risks associated with originating SBA and other government guaranteed loans.

Our SBA lending program is dependent upon the U.S. federal government. As an approved participant in the SBA Preferred Lender’s Program (an “SBA Preferred Lender”), we enable our customers to obtain SBA loans without being subject to the potentially lengthy SBA approval process necessary for lenders that are not SBA Preferred Lenders. The SBA periodically reviews the lending operations of participating lenders to assess, among other things, whether the lender exhibits prudent risk management. When weaknesses are identified, the SBA may request corrective actions or impose enforcement actions, including revocation of the lender’s SBA Preferred Lender status. If we lose our status as an SBA Preferred Lender, we may lose some or all of our customers to lenders who are SBA Preferred Lenders, and as a result we could experience a material adverse effect to our financial results. Any changes to the SBA program, changes to program-specific rules impacting volume eligibility under the guaranty program, as well as changes to the program amounts authorized by Congress, may also have a material adverse effect on our business. In addition, any default by the U.S. government on its obligations or any prolonged government shutdown could impede our ability to originate SBA loans or other government guaranteed loans or sell such loans in the secondary market, which could materially adversely affect our business, results of operations, and financial condition.

Generally, we sell the guaranteed portion of our SBA 7(a) loans in the secondary market. These sales result in premium income for us at the time of sale and create a stream of future servicing income, as we retain the servicing rights to these loans. For the reasons described above, we may not be able to continue originating these loans or sell them in the secondary market. Furthermore, even if we are able to continue to originate and sell SBA 7(a) loans in the secondary market, we might not continue to realize premiums upon the sale of the guaranteed portion of these loans, or the premiums may decline due to economic and competitive factors. When we originate SBA loans, we incur credit risk on the non-guaranteed portion of the loans, and if a customer defaults on a loan, we share any loss and recovery related to the loan pro-rata with the SBA. If the SBA establishes that a loss on an SBA guaranteed loan is attributable to significant technical deficiencies in the manner in which the loan was originated, funded, or serviced by us, the SBA may seek recovery of the principal loss related to the deficiency from us. Generally, we do not maintain reserves or loss allowances for such potential claims and any such claims could materially adversely affect our business, financial condition, or results of operations.

The laws, regulations and standard operating procedures that are applicable to government guaranteed loan products may change in the future. We cannot predict the effects of these changes on our business and profitability. Because government regulation greatly affects the business and financial results of all commercial banks and bank holding companies and especially our organization, changes in the laws, regulations and procedures applicable to government guaranteed loans could adversely affect our ability to operate profitably.

26

The recognition of gains on the sale of loans and servicing asset valuations reflect certain assumptions.

We continue to expect that gains on the sale of U.S. government guaranteed loans will continue to comprise a significant component of our revenue. The gain on such sales recognized for year ended December 31, 20212022 was $46.3$31.9 million. The determination of these gains is based on assumptions regarding the value of unguaranteed loans retained, servicing rights retained and deferred fees and costs, and net premiums paid by purchasers of the guaranteed portions of U.S. government guaranteed loans. The value of retained unguaranteed loans and servicing rights are determined based on market-derived factors such as prepayment rates, current market conditions and recent loan sales. Deferred fees and costs are determined using internal analysis of the cost to originate loans. Significant errors in assumptions used to compute gains on sale of loans or servicing asset valuations could result in material revenue misstatements, which may have a material adverse effect on our business, results of operations and profitability. In addition, while we believe these

25

valuations reflect fair value and such valuations are subject to validation by an independent third-party, if such valuations are not reflective of fair market value then our business, results of operations and financial condition may be materially and adversely affected.

Legal, Accounting, and Compliance Risks

Our accounting estimates and risk management processes and controls rely on analytical and forecasting techniques and models and assumptions, which may not accurately predict future events.

Our accounting policies and methods are fundamental to the manner in which we record and report our financial condition and results of operations. Our management must exercise judgment in selecting and applying many of these accounting policies and methods so they comply with GAAP and reflect management’s judgment of the most appropriate manner to report our financial condition and results of operations. In some cases, management must select the accounting policy or method to apply from two or more alternatives, any of which may be reasonable under the circumstances, yet which may result in our reporting materially different results than would have been reported under a different alternative.

Certain accounting policies and estimates are critical to presenting our financial condition and results of operations. They require management to make difficult, subjective or complex judgments about matters that are uncertain. Materially different amounts could be reported under different conditions or using different assumptions or estimates. These critical accounting policies and estimates include (i) acquisition-related fair value computations, (ii) the carrying value of loans and leases, (iii)(ii) determining the provision and allowance for loan and leasecredit losses, (iv)(iii) the valuation of intangible assets such as goodwill, servicing assets, core deposit intangibles, and customer relationship intangible (v)(iv) the determination of fair value for financial instruments, including other-than-temporary impairment losses, (vi) the valuation of real estate held for sale, and (vii)(v) the valuation of or recognition of deferred tax assets and liabilities. See Note 1 of the notes to our audited consolidated financial statements contained in Item 8 of this report for further information. Because of the uncertainty of estimates involved in these matters, we may be required to do one or more of the following: significantly increase the allowance for loancredit losses - loans and lease lossesleases or sustain loan and lease losses that are significantly higher than the reserve provided; reduce the carrying value of an asset measured at fair value; or significantly increase our accrued tax liability. Any of these could have a material adverse effect on our business, financial condition or results of operations. See Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations”.

Our internal controls, disclosure controls, processes and procedures, and corporate governance policies and procedures are based in part on certain assumptions and can provide only reasonable (not absolute) assurances that the objectives of the system are met. Furthermore, we currently outsource our internal audit function. Any failure or circumvention of our controls, processes and procedures or failure to comply with regulations related to controls, processes and procedures could necessitate changes in those controls, processes and procedures, which may increase our compliance costs, divert management attention from our business or subject us to regulatory actions and increased regulatory scrutiny. Any of these could have a material adverse effect on our business, financial condition, or results of operations.

Our goodwill may become impaired, which may adversely impact our results of operations and financial condition and may limit Byline Bank’s ability to pay dividends to us, thereby causing liquidity issues.

As of December 31, 2021,2022, we had goodwill of $148.4 million, or 17.7%19.4% of our total stockholders’ equity. The excess purchase consideration over the fair value of net assets from acquisitions, or goodwill, is evaluated for impairment at least annually and on an interim basis if an event or circumstance indicates that it is more likely than not that an impairment has occurred. In testing for impairment, we conduct a qualitative assessment and we also estimate the fair value of net assets based on analyses of our market value, discounted cash flows and peer values. Consequently, the determination of the fair value of goodwill is sensitive to market-based economics and other key assumptions. Variability in market conditions or in key assumptions could result in impairment of goodwill, which is recorded as a non-cash adjustment to income. An impairment of goodwill could have a material adverse effect on our business, financial condition and results of operations.

27

The accounting for loans acquired in connection with our recapitalization and acquisitions is based on numerous subjective determinations that may prove to be inaccurate and have a negative impact on our results of operations.

All loans acquired as part of our recapitalization in 2013 as well as loans acquired in connection with our subsequent acquisitions have beenwere recorded at their estimated fair value on their acquisition date without a carryover of the related allowance for loan losses. The determination of estimated fair value of purchased credit deteriorated and acquired non-credit-deteriorated loans requires management to make subjective determinations regarding discount rate, estimates of losses on defaults, market conditions and other factors that are highly subjective in nature. A risk exists that our estimate of the fair value of purchased credit deteriorated and acquired non-credit-deteriorated loans will prove to be inaccurate and that we ultimately will not recover the amount at which we recorded such loans on our balance sheet, which would require us to recognize losses.

Loans acquired that have evidence ofexperienced more than insignificant credit deterioration since origination and for which it is probable at the date of acquisition that we will not collect all contractually required principal and interest payments are accounted for under Accounting Standards Codification (“ASC”) Topic 310-30, Accounting for Purchased Loans with Deteriorated326, Financial Instruments – Credit Quality.Losses. These credit-impairedpurchased credit deteriorated (PCD) loans

26

have experienced more than insignificant credit deterioration since origination, like non-credit-impairednon-credit-deteriorated loans acquired, and have been recorded at estimated fair valuethe amount paid. An allowance for credit losses is determined using the same methodology as other loans held for investment. The initial allowance for credit losses - loans and leases, determined on their acquisition date, based on subjective determinations regarding risk ratings, expected future cash flowsa collective basis, is allocated to individual loans. The sum of the loan’s purchase price and fairallowance for credit losses becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the underlying collateral, withoutloan is a carryovernoncredit discount or premium, which is amortized into interest income over the life of the relatedloan. Subsequent changes to the allowance for credit losses are recorded through credit loss expense.

Acquired non‑credit-deteriorated loans and leases are accounted for under ASC Subtopic 310‑20, Receivables Nonrefundable Fees and Other Costs (“ASC 310‑20”). The difference between the fair value and unpaid principal balance of the loan at the acquisition date is amortized or accreted to interest income over the life of the loan. While credit discounts are included in the determination of the fair value from non-credit-deteriorated loans, since these discounts are expected to be accreted over the life of the loans, they cannot be used to offset the allowance for credit losses that must be recorded at the acquisition date. As a result, an allowance for credit losses is determined at the acquisition date using the same methodology as other loans held for investment and lease losses. We evaluate these loans quarterly to assess expected cash flows. Subsequent decreases to the expected cash flows will generally result inis recognized as a provision for loan losses. Subsequent increasescredit losses in cash flows result in a reversal of the provision for loan losses to the extent of prior charges or a reclassification of the difference from non-accretable to accretable yield with a positive impact on interest income prospectively. Because the accounting for these loans is based on subjective measures that can change frequently, we may experience fluctuations in our net interest income and provisions for loan losses attributable to these loans. These fluctuations could negatively affect our resultsconsolidated statements of operations. Any subsequent deterioration (improvement) in credit quality is recognized by recording a provision (recapture) for credit losses.

Our ability to recognize the benefits of deferred tax assets is dependent on future cash flows and taxable income.

We recognize the expected future tax benefit from deferred tax assets when it is more likely than not that the tax benefit will be realized. Otherwise, a valuation allowance is applied against deferred tax assets, reducing the value of such assets. Assessing the recoverability of deferred tax assets requires management to make significant estimates related to expectations of future taxable income from all sources, including reversal of taxable temporary differences, forecasted operating earnings and available tax planning strategies. Estimates of future taxable income are based on forecasted income from operations and the application of existing tax laws in each jurisdiction. Our acquisitions and risk profile are key components used in the determination of our ability to realize the expected future benefit of our deferred tax assets. To the extent that future taxable income differs significantly from estimates as a result of the interest rate environment and loan and lease growth capabilities or other factors, our ability to realize the net deferred tax assets could be affected.

We are an emerging growth company and have decided to take advantage of certain exemptions from various reporting and other requirements applicable to emerging growth companies.

For as long as we remain an “emerging growth company”, as defined in the Jumpstart Our Business Startups (“JOBS”) Act, we will have the option to take advantage of certain exemptions from various reporting and other requirements that are applicable to other public companies that are not emerging growth companies, including not being required to comply with the auditor attestation requirements of Section 404(b) of the Sarbanes-Oxley Act of 2002 (“Sarbanes-Oxley”), being permitted to have an extended transition period for adopting any new or revised accounting standards that may be issued by the FASB or the SEC, reduced disclosure obligations regarding executive compensation in our registration statements, periodic reports and proxy statements and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and stockholder approval of any golden parachute payments not previously approved. We have elected to, and expect to continue to, take advantage of certain of these and other exemptions until we are no longer an emerging growth company.

We will remain an emerging growth company until the end of the fiscal year following the fifth anniversary of the completion of our initial public offering, which is December 31, 2022.

Because we have elected to use the extended transition period for complying with new or revised accounting standards for an “emerging growth company”, our financial statements may not be comparable to companies that comply with these accounting standards as of the public company effective dates.

We have elected to use the extended transition period for complying with new or revised accounting standards under Section 7(a)(2)(B) of the Securities Act of 1933 (the “Securities Act”). This election allows us to delay the adoption of new or revised accounting standards that have different effective dates for public and private companies until those standards apply to private companies. As a result of this election, our financial statements may not be comparable to companies that comply with these accounting standards as of the public company effective dates. Because our financial statements may not be comparable to those of companies that comply with public company effective dates, investors may have difficulty evaluating or comparing our business, performance or prospects in comparison to other public companies, which may have a negative impact on the value and liquidity of our common stock.

Certain activities are restricted due to commitments entered into with the FRB by us and our foreign national stockholders.

We have certain stockholders who invested in our recapitalization who are foreign nationals, and we and these foreign national stockholders have entered into commitments with the FRB that restrict some of our activities. In particular, without approval of the FRB, we are restricted from engaging in certain transactions with these foreign national stockholders, their immediate families, and any company controlled by such foreign national stockholders or by their immediate families. If we were to fail to comply with any of these restrictions, we could be subject to enforcement and other legal actions by the FRB, including civil and criminal penalties, which could have a material adverse effect on our business, financial condition and results of operations.

Monetary policies and regulations of the FRB could adversely affect our business, financial condition, and results of operations.

In addition to being affected by general economic conditions, our earnings and growth are affected by the policies of the FRB. An important function of the FRB is to regulate the money supply and credit conditions. Among the instruments used by the FRB to implement these objectives are open market purchases and sales of U.S. government securities, adjustments of the discount rate, and

27

changes in banks’ reserve requirements against bank deposits. These instruments are used in varying combinations to influence overall economic growth and the distribution of credit, bank loans, investments, and deposits. Their use also affects interest rates charged on loans or paid on deposits.

The monetary policies and regulations of the FRB have had a significant effect on the operating results of commercial banks in the past and are expected to continue to do so in the future. The effects of such policies upon our business, financial condition, and results of operations cannot be predicted.

28

We are subject to numerous laws designed to protect consumers, including the Community Reinvestment Act and fair lending laws, and failure to comply with these laws could lead to a wide variety of sanctions.

The CRA requires our bank, consistent with safe and sound operations, to ascertain and meet the credit needs of its entire community, including low and moderate income areas. Our bank’s failure to comply with the CRA could, among other things, result in the denial or delay of certain corporate applications filed by us or our bank, including applications for branch openings or relocations and applications to acquire, merge or consolidate with another banking institution or holding company. In addition, the ECOA, the Fair Housing Act, and other fair lending laws and regulations prohibit discriminatory lending practices by financial institutions. A challenge to an institution’s compliance with fair lending laws and regulations could result in a wide variety of sanctions, including damages and civil money penalties, injunctive relief, restrictions on mergers and acquisitions activity, restrictions on expansion, and restrictions on entering new business lines. Private parties may also challenge an institution’s performance under fair lending laws in private class action litigation. Such actions could have a material adverse effect on our business, financial condition, results of operations, and growth prospects.

Litigation and regulatory actions, including possible enforcement actions, could subject us to significant fines, penalties, judgments, or other requirements resulting in increased expenses or restrictions on our business activities.

Our business is subject to increased litigation and regulatory risks as a result of a number of factors, including the highly regulated nature of the financial services industry and the focus of state and federal prosecutors on banks and the financial services industry generally. In the normal course of business, we have in the past and may in the future be named as a defendant in various legal actions, including arbitrations, class actions, and other litigation, arising in connection with our current and/or prior business activities. Legal actions could include claims for substantial compensatory or punitive damages or claims for indeterminate amounts of damages, resulting in increased expenses, diminished income, damage to our reputation, and divert management attention from the operation of our business. In addition, while the arbitration provisions in certain of our customer agreements historically have limited our exposure to consumer class action litigation, there can be no assurance that we will be successful in enforcing our arbitration clause in the future. Further, we have in the past and may in the future be subject to consent orders with our regulators.

We may also, from time to time, be the subject of subpoenas, requests for information, reviews, investigations and proceedings (both formal and informal) by governmental agencies regarding our current and/or prior business activities. Further, any settlement, consent order or adverse judgment in connection with any formal or informal proceeding or investigation by government agencies may result in litigation, investigations or proceedings as other litigants and government agencies begin independent reviews of the same activities. As a result, the outcome of legal and regulatory actions could be material to our business, results of operations, financial condition and cash flows.

Non-compliance with the USA PATRIOT Act, the Bank Secrecy Act or other laws and regulations could result in fines or sanctions against us.

The USA PATRIOT Act of 2001 and the Bank Secrecy Act require financial institutions to design and implement programs to prevent financial institutions from being used for money laundering and terrorist activities. If such activities are detected, financial institutions are obligated to file suspicious activity reports with the Financial Crimes Enforcement Network of the U.S. Department of the Treasury. These rules require financial institutions to establish procedures for identifying and verifying the identity of customers seeking to open new financial accounts. Federal and state bank regulators also have focused on compliance with Bank Secrecy Act and anti-money laundering regulations. Failure to comply with these regulations could result in fines or sanctions, including restrictions on conducting acquisitions or establishing new branches. While we have developed policies and procedures designed to assist in compliance with these laws and regulations, these policies and procedures may not be effective in preventing violations of these laws and regulations. Failure to maintain and implement adequate programs to combat money laundering and terrorist financing could also have serious reputational consequences for us, which could have a material adverse effect on our business, financial condition or results of operations.

Regulations relating to privacy, information security, and data protection could increase our costs, affect or limit how we collect and use personal information, and adversely affect our business opportunities.

We are subject to various privacy, information security, and data protection laws, including requirements concerning security breach notification, and we could be negatively affected by these laws. For example, our business is subject to the Gramm-Leach-Bliley

28

Act which, among other things: (i) imposes certain limitations on our ability to share nonpublic personal information about our customers with nonaffiliated third parties; (ii) requires that we provide certain disclosures to customers about our information collection, sharing and security practices, and (iii) requires that we develop, implement and maintain a written comprehensive information security program. Various state and federal banking regulators and states have also enacted data security breach notification requirements with varying levels of individual, consumer, regulatory or law enforcement notification in certain circumstances in the event of a security breach. Moreover, legislators and regulators in the United States are increasingly adopting or revising privacy, information security and data protection laws that potentially could have a significant impact on our privacy, data protection and information security-related practices, our collection, use, sharing, retention and safeguarding of consumer or employee information, and some of our current or

29

planned business activities. This could also increase our costs of compliance and business operations and could reduce income from certain business initiatives.

Compliance with current or future privacy, data protection, and information security laws to which we are subject could result in higher compliance and technology costs and could restrict our ability to provide certain products and services, which could have a material adverse effect on our business, financial condition or results of operations. Our failure to comply with privacy, data protection and information security laws could result in potentially significant regulatory or governmental investigations or actions, litigation, fines, sanctions and damage to our reputation, which could have a material adverse effect on our business, financial condition, or results of operations.

Risks Related to Acquisition Activity

We may be adversely affected by risks associated with completed and potential acquisitions, including execution risks, failure to realize anticipated transaction benefits, and failure to overcome integration risks, which could adversely affect our growth and profitability.

We have continued to grow our business both organically and through the acquisition of smaller banks that management believes strategically fit within our franchise and that we believe support our businesses and make financial and strategic sense. In the event that we continue to pursue further acquisitions, we may have difficulty executing on and may not realize the anticipated benefits of any transaction we complete. Any of the foregoing matters could materially and adversely affect us.

Generally, any acquisition of target financial institutions, branches, or other banking assets by us will require approval by, and cooperation from, a number of governmental regulatory agencies, possibly including the FRB and the FDIC as well as the IDFPR. Such regulators could deny our application, which would restrict our growth, or the regulatory approvals may not be granted on terms that are acceptable to us.

As to any acquisition that we complete, we may fail to realize some or all of the anticipated transaction benefits if the integration process takes longer or is more costly than expected or otherwise fails to meet our expectations. Depending on the condition of any institution or assets or liabilities that we may acquire, that acquisition may, at least in the near term, adversely affect our capital and earnings and, if not successfully integrated with our organization, may continue to have such effects over a longer period. Also, acquisitions may involve the payment of a premium over book and market values and, therefore, some dilution of our tangible book value and net income per common share may occur in connection with any future transaction. Our inability to overcome these risks could have a material adverse effect on our profitability, return on equity, return on assets, and our ability to implement our business strategy and enhance stockholder value, which, in turn, could have a material adverse effect on our business, financial condition, and results of operations.

Risks Related to the Ongoing COVID-19 Pandemic

The COVID-19 pandemic has affected and continues to affect us, our business, employees, customers, counterparties and third-party service providers, and the ultimate extent of the impacts on our business, financial position, results of operations, liquidity and prospects is uncertain.

The COVID-19 pandemic has created significant economic and financial disruption in the United States and globally. While the scope, duration and full effects of the pandemic are still not fully known, the pandemic and its associated impacts have had, are currently having and may for some time continue to have a destabilizing and negative effect on the U.S. and global economies, as well as financial and capital markets. The pandemic has impacted interest rates, increased economic and market uncertainty, disrupted trade and supply chains, increased unemployment levels, decreased consumer confidence generally and has generally caused significant disruption in global, national and local economic and business activity.

The ultimate extent of the impact of the pandemic on our business, cash flows, financial condition, liquidity, results of operations, customer confidence, profitability and growth prospects will depend on continuing and future developments related to the virus, which are highly uncertain, cannot be predicted and are outside of our control. These future developments may include the scope and duration of the COVID-19 pandemic, the emergence of new variants of COVID-19, the possibility of future resurgences of the COVID-19 pandemic, the continued effectiveness of our business continuity plan, including work-from-home arrangements, and

29

staffing at branches and certain other facilities, the direct and indirect impact of the COVID-19 pandemic on our employees, customers, counterparties and third-party service providers, as well as on other market participants, actions taken, or that may yet be taken, by governmental authorities and other third parties in response to the COVID-19 pandemic. Future developments, including increased unemployment rates, or turbulence in U.S. or global financial markets could adversely affect our revenues and the values of our assets and liabilities, reduce the availability of funding, lead to a tightening of credit, and further increase stock price volatility. These and other potential impacts of epidemics, pandemics or other outbreaks of an illness, disease or virus could therefore materially and adversely affect our business, revenue, operations, financial condition, liquidity, results of operations and prospects.

Although financial markets have largely rebounded from the significant declines that occurred earlier in the COVID-19 pandemic and global economic conditions showed signs of improvement during the second half of 2020 and throughout 2021, many of the circumstances that arose or became more pronounced after the onset of the COVID-19 pandemic persist, including:

As a result, our credit, operational, and certain other risks are generally expected to remain elevated until the COVID-19 pandemic subsides. Depending on the duration and severity of the COVID-19 pandemic going forward, the conditions noted above could continue for an extended period and these or other adverse developments may occur or reoccur.

The length of the COVID-19 pandemic and the efficacy of the extraordinary measures being put in place to address it are unknown. There are no comparable recent events that provide guidance as to the economic recovery from the effects of the COVID-19 pandemic or the effect the spread of COVID-19 as a global pandemic may have. Even after the COVID-19 pandemic subsides, the U.S. economy may experience a recession, and we anticipate that our businesses could be materially and adversely affected by a recession. To the extent the pandemic adversely affects our business, financial condition, liquidity, capital, loans, asset quality, or results of operations, it may also have the effect of heightening many of the other risks described in this “Risk Factors” section of the Form 10-K.

General Risk Factors

Loss of deposits could increase our funding costs.

We rely on customer deposits to meet a considerable portion of our funding needs, and we continue to seek customer deposits to maintain this funding base. We accept deposits directly from consumer and commercial customers and, as of December 31, 2021,2022, we had $5.2$5.7 billion in deposits. These deposits are subject to potential fluctuations in availability or the price we must pay (in the form of interest) to obtain them due to certain factors outside our control, such as increasing competitive pressures from other financial services firms for deposits and changes in interest rates and returns on other investment classes, which could result in significant outflows of deposits within short periods of time or significant changes in pricing necessary to maintain current deposits or attract additional deposits. The loss of customer deposits for any reason could increase our funding costs.

We operate in a highly competitive and changing industry and market area and compete with both banks and non-banks.

We operate in the highly competitive financial services industry and face significant competition for customers from financial institutions located both within and beyond our principal markets. We compete with national commercial banks, regional banks, private banks, savings banks, credit unions, non-bank financial services companies, FinTech companies and other financial institutions operating within or near the areas we serve, many of whom are much larger and have significantly greater resources than us and that target the same customers we do in the Chicago metropolitan area. In order to compete, we may have to pay higher interest rates to

30

attract deposits, accept lower yields to attract loans and pay higher wages for new employees, resulting in lower net interest margins and reduced profitability. As customer preferences and expectations continue to evolve, technology has lowered barriers to entry and made it possible for banks to expand their geographic reach by providing digital banking services and for non-banks to offer products and services traditionally provided by banks. The banking industry is experiencing rapid changes in technology, and, as a result, our future success will depend in part on our ability to address our customers’ needs by using technology. Many of our non-bank competitors are not subject to the same extensive regulations that govern our activities and, as a result, may have greater flexibility in competing for business. We also face increased competition in our U.S. government guaranteed lending business, which can adversely affect our volume and the premium, if any, recognized on sales of the guaranteed portions of such U.S. government guaranteed loans. Our inability

30

to compete successfully in the markets in which we operate could have a material adverse effect on our business, financial condition, or results of operations.

Our principal stockholder, MBG Investors I, L.P. has significant influence over us, and its interests could conflict with those of our other stockholders.

Currently, our principal stockholder, MBG Investors I, L.P., owns approximately 30.4%30.8% of the outstanding shares of our common stock and its general partner is one of our directors. As a result, MBG Investors I, L.P. is able to influence matters requiring approval by our stockholders, including the election of directors and the approval of mergers or other extraordinary transactions. MBG Investors I, L.P. may also have interests that differ from yours and may vote in a way with which you disagree and which may be adverse to your interests. The concentration of ownership may also have the effect of delaying, preventing, or deterring a change of control of the Company, could deprive our stockholders of an opportunity to receive a premium for their common stock as part of a private sale of their shares of the Company, subject us to the influence of a presently unknown third-party and might ultimately affect the market price of our common stock.

Future sales of our common stock in the public market, including by our pre-IPO stockholders, could lower our stock price.

The market price of our common stock could decline as a result of sales of a large number of shares of our common stock or from the perception that such sales could occur. These sales, or the possibility that these sales may occur, also may make it more difficult for us to raise additional capital by selling equity securities in the future, at a time and price that we deem appropriate.

Certain of our pre-IPO stockholders, including affiliates such as MBG Investors, I, L.P., hold restricted shares that could be sold in accordance with the volume, manner of sale, and other limitations under Rule 144 or through registration under the Securities Act. We cannot predict the size of future issuances or sales of our common stock by our pre-IPO stockholders or the effect, if any, that future issuances or sales of shares of our common stock may have on the market price of our common stock. Sales or distributions of substantial amounts of our common stock (including shares issued in connection with an acquisition), or the perception that such sales could occur, may cause the market price of our common stock to decline.

Item 1B. Unresolved Staff Comments.

None

Item 2. Properties.

Our corporate headquarters is located at 180 North LaSalle Street, Suite 300, Chicago, IL 60601. In addition to our corporate headquarters, we operate 4337 branch offices located in the Chicago metropolitan area and one branch office in Brookfield, Wisconsin. We lease 14nine of our branch offices and our headquarters and own the remainder of our branch offices. We are continually evaluating opportunities to improve our existing branches and branch network, and we have in the recent past closed and may in the future choose to close branches in certain circumstances in order to improve our efficiency or for other business reasons.

Item 3. Legal Proceedings.

We operate in a highly regulated environment. From time to time we are a party to various litigation matters incidental to the conduct of our business. We are not presently a party to any legal proceedings the resolution of which we believe would have a material adverse effect on our business, financial condition, liquidity, results of operation, cash flows or capital levels.

Item 4. Mine Safety Disclosures.

Not applicable.

31

PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Our common stock is listed on the New York Stock Exchange (the “NYSE”) under the symbol “BY”. There were approximately 1,170953 holders of record of our common stock as of March 4, 2022.1, 2023.

The timing and amount of cash dividends paid on our common stock depends on our earnings, financial condition, capital requirements and other relevant factors. The primary sources for payment of dividends to our stockholders are dividends paid to the Company by Byline Bank and cash on hand. We are subject to state law limitations on the payment of dividends. Delaware law generally limits dividends if: (a) the corporation does not have a surplus; or (b) the corporation does not have net profits for the fiscal year in which the dividend is declared and/or the preceding fiscal year. We have an internal policy that prohibits the Board of Byline Bank from declaring and paying dividends that would cause the minimum capital amounts required for Byline Bank to be considered less than “well capitalized” for regulatory purposes. See Item 1. “Business – Supervision and Regulations – Dividends; Stress Testing”Dividends” above and Note 2120 of notes to consolidated financial statements contained in Item 8 of this report.

We paid a cash dividend of $0.09 per share for each quarter of 2022. We paid a cash dividend of $0.06 per share for the first and second quarters of 2021 and a $0.09 per share cash dividend for the third and fourth quarter of 2021. We paid a cash dividend of $0.03 per share for each quarter of 2020 and did not pay any dividends on its common stock during 2019.

Issuer Purchases of Equity Securities.

On November 1, 2019, we announced that our Board of Directors approved a stock repurchase program authorizing the purchase of up to an aggregate of 1,250,000 shares of our outstanding common stock at the discretion of management, from time to time in open market purchases as market conditions warrant or in privately negotiated transactions including pursuant to a Rule 10b5-1 plan as well as the safe harbor provided by Rule 10b-18 under the Exchange Act. The program terminated on December 31, 2020, and an aggregate of 118,486 shares were purchased under the program as of that date.

On December 10, 2020, we announced that our Board of Directors approved a new stock repurchase program authorizing the purchase of up to an aggregate of 1,250,000 shares of our outstanding common stock, and on July 27, 2021, our Board of Directors authorized an expansion of our currentthe stock repurchase program. Under the extended program, we arethe Company was authorized to repurchase an additional 1,250,000 shares of the Company's outstanding common stock. The program was in effect until December 31, 2022.

We purchased 689,068 shares at a cost of $17.3 million under the stock repurchase program during the year ended December 31, 2022. We purchased 1,331,708 shares at a cost of $28.9 million under this program during the year ended December 31, 2021.

On December 12, 2022, we announced that our Board of Directors approved a new stock repurchase program authorizing the purchase of up to an aggregate of 1,250,000 shares of our outstanding common stock..stock. The program will be in effect from January 1, 2023 until December 31, 2023 unless terminated earlier. The shares may, at the discretion of management, be repurchased from time to time in open market purchases as market conditions warrant or in privately negotiated transactions. We are not obligated to purchase any shares under the program, and the program may be discontinued at any time. The actual timing, number and share price of shares purchased under the repurchase program will be determined by us at our discretion and will depend on a number of factors, including the market price of our stock, general market and economic conditions and applicable legal requirements.

We purchased a total of 1,331,708 shares of its common stock during 2021. We did not purchase any shares during the fourth quarter of 2021 under our stock repurchase program. The shares authorized to be repurchased represent approximately 3.1%3.3% of our outstanding common stock as ofat December 31, 2021. The program expires on December 31, 2022, unless earlier terminated. 2022.

The table below includes information regarding purchases of our common stock pursuant to the repurchase program during the quarter ended December 31, 2021.2022. We did not purchase any shares of our common stock during the fourth quarter of 2022 under our stock repurchase program.

(1)These shares were acquired pursuant to our 2017 Omnibus Incentive Compensation Plan. Under the terms of compensation plan, we can accept previously owned shares of common stock to be surrendered to satisfy the exercise price of stock options, the settlements of restricted stock awards and tax withholding obligations upon vesting and/or exercise..exercise.

Recent Sales of Unregistered Securities; Use of Proceeds From Registered Securities.

None.

32

Stock Performance Graph.

The following graph compares the cumulative total stockholder return on our common stock from June 30,December 31, 2017 through December 31, 2021,2022, with the cumulative total return of: (1) the Russell 2000 (U.S. Stock) Index, (2) a peer group of the S&P U.S. SmallCap Banks Index and, (3) the KBW NASDAQ Regional Bank Index (“KRX”). Total return assumesIncluded in the reinvestment of all dividends.KRX index are U.S. regional banks that we believe are similar to the Company. We believe the KRX index provides a meaningful comparison to our cumulative total return. Included inTotal return assumes the KRX index are U.S. regional banks similar to us.reinvestment of all dividends.

* The information assumes that $100 was invested at the closing price on June 30,December 31, 2017 in our stock and each index, and that all dividends are reinvested.

Item 6. [Reserved]

33

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following is a discussion and analysis of our financial condition and results of operations and should be read in conjunction with our financial statements and notes thereto included in Item 8 of this report. In addition to historical information, this discussion contains forward‑looking statements that involve risks, uncertainties and assumptions that could cause actual results to differ materially from management’s expectations. Factors that could cause such differences are discussed in the sections entitled “Special Note Regarding Forward‑Looking Statements” and “Risk Factors”. Byline assumes no obligation to update any of these forward‑looking statements.

Management’s discussion focuses on 2022 results compared to 2021. For a discussion of 2021 results compared to 2020. For a discussion of 2020, results compared to 2019, refer to Part I, Item 7 of our 20202021 Annual Report filed on Form 10-K, which was filed with the SEC on March 4, 2021.7, 2022.

Executive Summary

Our results of operations depend substantially on net interest income, which is the difference between interest income on interest-earning assets, consisting primarily of interest income on loans and lease receivables, including accretion income on loans, investment securities and other short-term investments, and interest expense on interest-bearing liabilities, consisting primarily of deposits and borrowings. Our results of operations are also dependent upon our generation of non-interest income, consisting primarily of income from fees and service charges on deposits, loan servicing revenue, wealth management and trust income, ATM and interchange fees, and net gains on sales of investment securities and loans. Other factors contributing to our results of operations include our provisions for loan and leasecredit losses, provision for income taxes, and non-interest expenses, such as salaries and employee benefits, occupancy and equipment expenses and other miscellaneous operating costs.

We reported consolidated net income of $88.0 million for the year ended December 31, 2022, compared to net income of $92.8 million for the year ended December 31, 2021, compared to net incomea decrease of $37.5 million for the year ended December 31, 2020, an increase of $55.3$4.8 million. The increasedecrease in net income was attributable to a $21.4$22.9 million increase in the provision for credit losses, and a $16.9 million decrease in non-interest income, offset by a $28.9 million increase in net interest income, a $54.5$1.4 million decrease in thenon-interest expense, and a $4.7 million decrease in provision for loan and lease losses, and a $12.2 million increase in non-interest income offset by a $17.2 milliontaxes. The increase in provision for income taxes,credit losses was mainly driven by increases in the general reserves as a result of growth in the loan and a $15.5 million increaselease portfolio and the adoption of CECL. The decrease in non-interest expense.income was primarily driven by decreases in gains on the sales of loans. The increase in net interest income during the year ended December 31, 20212022 was primarily a result of an increase in average interest earning assets. The decrease in provision for loan and lease losses was mainly driven by decreases in the general reserves driven by decreases in qualitative factors due to the continued economic recovery. The increase in non-interest income was primarily driven by gains on the sales of loans. The increase in provision for income taxes was mostly driven by an increasea decrease in net income before provision for income taxes during the period. The increase in non-interest expense was mainly due to an increase in salaries and employee benefits as a result of new hires and increases in incentive compensation.

Dividends declared and paid on preferred shares were $196,000 and $783,000 for the years ended December 31, 20212022 and 2020.2021. Dividends declared on common shares were $11.4$13.5 million for the year ended December 31, 2021.2022. Dividends paid on common shares were $11.3$13.4 million and $5.7$11.3 million for the years ended December 31, 20212022 and 2020,2021 respectively. For the years ended December 31, 20212022 and 2020,2021, net income available to common stockholders was $87.8 million, or $2.37 per basic and $2.34 per diluted common share, and $92.0 million, or $2.45 per basic and $2.40 per diluted common share, and $36.7 million, or $0.96 per basic and diluted common share, respectively. Our results of operations for the years ended December 31, 20212022 and 2020,2021, produced an annual return on average assets of 1.40%1.25% and 0.61%1.40% and a return on average stockholders’ equity of 11.31%11.33% and 4.78%11.31%, respectively.

Since our recapitalization in June 2013, our branch network has been reduced from 88 to 44,38, including 13 branches added through acquisition. During 2020 and 20212022 we consolidated 17six branches within our network with minimal impact on our customer service levels, convenience, and business development capabilities. In December 2021 we announced plans to consolidate six branches during the second quarter of 2022. We expect these consolidations to generate over $5.3 million in annual cost savings. We expect to reinvest approximately 70% of the anticipated annualized cost savings into talent and technology that will further enhance our digital banking capabilities.

Critical accounting policies and estimates

Our accounting and reporting policies conform to GAAP and to general practices within the banking industry. To prepare financial statements and interim financial statements in conformity with GAAP, management makes estimates, assumptions and judgments based on available information. These estimates, assumptions and judgments affect the amounts reported in the financial statements and accompanying notes; and are based on information available as of the date of the financial statements. As this information changes, actual results could differ from the estimates, assumptions and judgments reflected in the financial statements. In particular, management has identified several accounting policies that, due to the estimates, assumptions and judgments inherent in those policies, are critical in understanding our financial statements.

These critical accounting policies and estimates include (i) acquisition‑related fair value computations, (ii) the carrying value of loans and leases, (iii)(ii) determining the provision and allowance for loan and leasecredit losses, (iv)(iii) the valuation of intangible assets such as goodwill, servicing assets and core deposit intangibles, (v)(iv) the determination of fair value for financial instruments, including other-than-temporary-impairment losses, (vi) the valuation of real estate held for sale, and (vii)(v) the valuation or recognition of deferred tax assets and liabilities.

The JOBS Act permits us an extended transition period for complying with new or revised accounting standards affecting public companies. We have elected to take advantage of this extended transition period, which means that the financial statements included in this annual report on Form 10-K, as well as any financial statements that we file in the future, will not be subject to all new

34

or revised accounting standards generally applicable to public companies for the transition period for so long as we remain an emerging growth company or until we affirmatively and irrevocably opt out of the extended transition period provided for under the JOBS Act.

The following is a discussion of the critical accounting policies and significant estimates that require us to make complex and subjective judgments. Additional information about these policies can be found in Note 1 of our audited consolidated financial statements contained in Item 8 of this report.

Business combinations

We account for business combinations under the acquisition method of accounting in accordance with ASC Topic 805, Business Combinations (“ASC 805”). We recognize the fair value of the assets acquired and liabilities assumed as of the date of acquisition, with any excess of the fair value of consideration provided over the fair value of the identifiable net tangible and intangible assets acquired recorded as goodwill. Transaction costs are expensed as incurred. Application of the acquisition method requires extensive use of accounting estimates and judgments to determine the fair values of the identifiable assets acquired and liabilities assumed at the acquisition date.

In accordance with ASC 805, the acquiring company retains the right to make appropriate adjustments to the assets and liabilities of the acquired entity for information obtained during the measurement period about facts and circumstances that existed as of the acquisition date. The measurement period ends as of the earlier of (i) one year from the acquisition date or (ii) the date when the acquirer receives the information necessary to complete the business combination accounting.

Originated loans and leases

We account for originated loans and leases and purchased loans and leases not acquired through business combinations as originated loans and leases. The newNewly originated loans that management has the intent and ability to hold for the foreseeable future are reported at their outstanding principal balances net of any allowance for loan and leasecredit losses, unamortized deferred fees and costs and unamortized premiums or discounts. The net amount of nonrefundable loan origination fees and certain direct costs associated with the lending

34

loan origination process are deferred and amortized to interest income over the contractual lives of the new loans using methods which approximate the level yield method. Discounts and premiums are amortized or accreted to interest income over the estimated term of the new loans using methods that approximate the effective yield method. Interest income on new loans is accrued based on the unpaid principal balance outstanding. Additionally, once an acquired non-impaired loan reaches its contractual maturity date, it is re-underwritten, and if renewed, it is classified as an originated loan.

AcquiredPurchased credit deteriorated loans and leases

Purchased credit deteriorated ("PCD") loans have experienced more than insignificant credit deterioration since origination. PCD loans are recorded at the amount paid. An allowance for credit losses is determined using the same methodology as other loans held for investment. The initial allowance for credit losses determined on a collective basis is allocated to individual loans. The sum of the loan’s purchase price and allowance for credit losses becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is amortized into interest income over the life of the loan. Subsequent changes to the allowance for credit losses are recorded through credit loss expense.

Acquired non-credit-deteriorated loans and leases are recorded at

For acquired non‑credit-deteriorated loans and leases, the difference between the fair value asand unpaid principal balance of the loan at the acquisition date. Creditdate is amortized or accreted to interest income over the life of the loan. While credit discounts are included in the determination of the fair value; therefore, anvalue for non-credit-deteriorated loans, since these discounts are expected to be accreted over the life of the loans, they cannot be used to offset the allowance for loan and leasecredit losses is notthat must be recorded at the acquisition date. AcquiredAs a result, an allowance for credit losses is determined at the acquisition date using the same methodology as other loans are evaluated upon acquisitionheld for investment and classifiedis recognized as either acquired impaired or acquired non‑impaired. Acquired impaired loans reflect evidencea provision for credit losses in the consolidated statements of credit deterioration since origination for which it is probable that all contractually required principal and interest will not be collected by us. Subsequent to acquisition, we periodically update for changes in cash flow expectations, which are reflected in interest income over the life of the loan as accretable yield.operations. Any subsequent decreasesdeterioration (improvement) in expected cash flow attributable to credit deterioration arequality is recognized by recording a provision for loan losses.

For acquired non‑impaired loans and leases, the excess or deficit of the loan and lease principal balance over the fair value is recorded as a premium or discount at acquisition and is accreted through interest income over the life of the loan or lease. Subsequent to acquisition, these loans and leases are evaluated(recapture) for credit deterioration and a provision for loan and lease losses would be recorded when probable loss is incurred. These loans and leases are evaluated for impairment consistent with originated loans and leases.losses.

Provision and allowance for loan and leasecredit losses

The provision for loan and leasecredit losses reflects the amount required to maintain the allowance for loan and leasecredit losses (“ALLL”ACL”) at an appropriate level based upon management’s evaluation of the adequacy of generalcollectively and specificindividually evaluated loss reserves.

The ALLLACL is maintained at a level that management believes is appropriate to provide for known and inherent incurred loan and leasecurrent expected credit losses as of the dates of the Consolidated Statements of Financial Condition, and we have established methodologies for the determination of its adequacy. The methodologies are set forth in a formal policy and take into consideration the need for an overall general valuation allowance as well as specific allowances that are determined on an individual loan basis.relevant available information, from internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts. We increase our ALLLACL by chargingrecording provisions for probablecurrent expected credit losses against our income and decrease by charge‑offs, net of recoveries.

The evaluation is inherently subjective, as it requires estimates that are susceptible to significant revision as more information becomes available. While management uses available information to recognize losses on loans and leases, changes in economic or other conditions may necessitate revision of the estimate in future periods.

The ALLLACL is maintained at a level management believes is sufficient to provide for probablecurrent expected credit losses based upon an ongoing review of the originated and acquired non‑impaired loan and lease portfolios by portfolio category, which include consideration of actual loss experience, peer loss experience, changes in the size and risk profile of the portfolio, identification of individual problem loan and lease situations which may affect a borrower’s ability to repay, reasonable and supportable forecasts, and evaluation of prevailing economic conditions. We use risk ratings as credit indicators to classify loans and leases into pools and to estimate loss rates for each of the loan and lease pools. Additional information about these policies can be found in Note 5 of our audited consolidated financial statements contained in Item 8 of this report.

For each portfolio, management estimates expected credit losses over the life of each loan and lease utilizing lifetime or cumulative loss rate methodology, which identifies macroeconomic factors and asset-specific characteristics that are correlated with credit loss experience including loan age, loan type, and leverage. The lifetime loss rate is applied to the amortized cost of the loan or lease. This methodology builds on default and loss probabilities by utilizing pool-specific historical loss rates to calculate expected credit losses. These pool-specific historical loss rates may be adjusted for a forecast of certain macroeconomic variables, and other factors such as differences in underwriting standards, or portfolio mix. Each time we measure expected credit losses, management assesses the relevancy of historical loss information and considers any necessary adjustments to address any differences in asset-specific characteristics.

The lifetime loss rates are estimated by analyzing a combination of internal and external data related to historical performance of each loan and lease pool over a complete economic cycle. Loss rates are based on historical averages for each loan and lease pool, adjusted to reflect the impact of a forward-looking forecast of certain macroeconomic variables such as unemployment rates, gross domestic product, or commercial property values, which management considers to be both reasonable and supportable. Various economic scenarios are considered and weighted to arrive at the forecast that most reflects management’s expectation of future conditions. After a one-year forecast period, a one-year reversion period adjusts loss experience to the historical average on a straight-line basis.

35

ForManagement also considers qualitative risk factor adjustments that are intended to capture internal and external trends not reflected in historical loss history. Each risk factor is assigned an allowance level based on management’s judgment as to the expected impact of each risk factor on each loan portfolio and is monitored quarterly. All acquired impairednon-credit-deteriorated loans a specific valuation allowance is established when it is probable that we will be unable to collect all of the cash flows expected at acquisition, plus the additional cash flows expected to be collected arising from changes in estimates after acquisition.

The credit quality of loans in these loan portfolios are impacted by delinquency status and debt service coverage generated by the borrowers’ businesses and fluctuations in the value of real estate collateral.

Acquired non‑impaired loansleases and originated loans are considered impaired when, based on current information and events, it is probable that we will be unable to collect the scheduled paymentsleases of principal or interest when due, according to the contractual terms of the loan agreements. All acquired non‑impaired loans and originated loans of $100,000$500,000 or greater with an internal risk rating of substandard or below, or on nonaccrual, as well as loans classified as TDR, are reviewed individually for impairment on a quarterly basis.

In March of 2020, the CARES Act was enacted by the U.S. government in response to the economic disruption caused by the COVID-19 pandemic. The CARES Act provided that a qualifiedCompany also maintains an allowance for credit losses on off-balance sheet credit exposures for unfunded loan modificationcommitments. This allowance is exempt by law from classificationreflected as a TDR, fromcomponent of other liabilities which represents management’s current estimate of expected losses in the period beginning Marchunfunded loan commitments. The estimate includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over its estimated life based on management’s consideration of past events, current conditions, and reasonable and supportable economic forecasts. Management tracks the level and trends in unused commitments and takes into consideration the same factors as those considered for purposes of the allowance for credit losses on outstanding loans. The Company also evaluates its held-to-maturity debt securities for current expected credit losses. Additional information about these policies can be found in Note 1 2020 untilof our audited consolidated financial statements contained in Item 8 of this report.

Results for the earlier ofyear ended December 31, 2020 or the date2022 are presented under CECL methodology while prior period amounts continue to be reported in accordance with ASC Topic 450, Contingencies, and specific reserves based upon ASC Topic 310, Receivables. The ASC for impairment, ASC 310, is applied to commercial and consumer loans that is 60 days after the date on which the national emergency concerning the COVID-19 pandemic declared by the President of the United States terminates. The Consolidation Appropriations Act further extended the suspension period until the earlier of January 1, 2022 or the date that is 60 days after the date on which the national emergency concerning the COVID-19 pandemic declared by the President of the United States terminates. We have modifications under these Acts. The underlying loans and leases are subject to the same underwriting, risk-rating and accrual standards as the rest of the loan portfolio.individually assessed for impairment.

Goodwill and intangible assets

Goodwill.Goodwill. Goodwill represents the excess of the purchase consideration over the fair value of net assets acquired in connection with our recapitalization and acquisitions using the acquisition method of accounting. Goodwill is not amortized but is periodically evaluated for impairment under the provisions of ASC Topic 350, Intangibles—Goodwill and Other (“ASC 350”).

Impairment testing is performed using either a qualitative or quantitative approach at the reporting unit level. Our goodwill is allocated to Byline Bank, which is our only applicable reporting unit for the purposes of testing goodwill for impairment. We have selected November 30 as the date to perform the annual goodwill impairment test. Additionally, we perform a goodwill impairment evaluation on an interim basis when events or circumstances indicate impairment potentially exists.

Servicing assets.assets. Servicing assets are recognized separately when they are acquired through sales of loans or when the rights to service loans are purchased. When loans are sold with servicing rights retained, servicing assets are recorded at fair value in accordance with ASC Topic 860, Transfers and Servicing (“ASC 860”). Fair value is based on market prices for comparable servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The fair value of servicing rights is highly sensitive to changes in underlying assumptions. Changes in the prepayment speed and discount rate assumptions have the most significant impact on the fair value of servicing rights. See Note 76 and Note 1817 of the notes to our audited consolidated financial statements contained in Item 8 of this report for additional information.

Core deposit intangible assets.assets. Other intangible assets primarily consist of core deposit intangible assets. In valuing core deposit intangibles, we consider variables such as deposit servicing costs, attrition rates and market discount rates. Core deposit intangibles are reviewed annually, or more frequently when events or changes in circumstances occur that indicate that their carrying values may not be recoverable. If the recoverable amount of the core deposit intangibles is determined to be less than its carrying value, we would then measure the amount of impairment based on an estimate of the fair value at that time. We also evaluate whether the events or circumstances have occurred that warrant a revision to the remaining useful lives of intangible assets. In cases where a revision is deemed appropriate, the remaining carrying amounts of the intangible assets are amortized over the revised remaining useful life. Core deposit intangibles are currently amortized over an approximate ten-year period.

Customer relationship intangible.intangible. Other intangible assets also include our customer relationship intangible asset. In valuing our customer relationship intangibles, we consider variables such as assets under management,administration, attrition rates, and fee structure. Customer relationship intangibles are currently amortized over a 12-year period.

Fair value of financial instruments

ASC Topic 820, Fair Value Measurement defines fair value as the price that would be received to sell a financial asset or paid to transfer a financial liability in an orderly transaction between market participants at the measurement date.

The degree of management judgment involved in determining the fair value of assets and liabilities is dependent upon the availability of quoted market prices or observable market parameters. For financial instruments that trade actively and have quoted market prices or observable market parameters, there is minimal subjectivity involved in measuring fair value. When observable market prices and parameters are not available, management judgment is necessary to estimate fair value. In addition, changes in market conditions may reduce the availability of quoted prices or observable data. For example, reduced liquidity in the capital markets or changes in secondary market activities could result in observable market inputs becoming unavailable. Therefore, when market data is not available, we would use valuation techniques requiring more management judgment to estimate the appropriate fair value measurement.

36

See Note 1817 of the notes to our audited consolidated financial statements contained in Item 8 of this report for a complete discussion of our use of fair value of financial assets and liabilities and their related measurement practices.

Valuation of real estate held for sale36

Other real estate owned. OREO includes real estate assets that have been acquired through, or in lieu of, loan foreclosure or repossession and are to be sold. OREO assets are initially recorded at fair value, less estimated costs to sell, of the collateral of the loan, on the date of foreclosure or repossession, establishing a new cost basis. Adjustments that reduce loan balances to fair value at the time of foreclosure or repossession are recognized as charge‑offs in the allowance for loan and lease losses. Positive adjustments, if any, at the time of foreclosure or repossession are recognized as a reduction in non‑interest expense. After foreclosure or repossession, management periodically obtains new valuations and real estate or other assets may be adjusted to a lower carrying amount, determined by the fair value of the asset, less estimated costs to sell. Any subsequent write‑downs are recorded as a decrease in the asset and charged against other real estate owned valuation adjustments, included within non-interest expense. Operating expenses of such properties, net of related income, are included in non‑interest expense, and gains and losses on their disposition are included in non‑interest expense. Gains on internally financed other real estate owned sales are accounted for in accordance with the methods stated in ASC Topic 360‑20, Real Estate Sales (“ASC 360‑20”). Any losses on the sales of other real estate owned properties are recognized immediately.

Assets held for sale. Assets held for sale consist of former branch locations and real estate purchased for expansion. Assets are considered held for sale when management has approved a plan to sell the assets following a branch closure or other events. The properties are being actively marketed and transferred to assets held for sale based at the lower of its carrying value or its fair value, less estimated costs to sell. Adjustments to reduce the asset balances to fair value are recorded at the time of transfer and are recognized through a charge against income. An assessment of the recoverability of other long-lived assets associated with all branches is periodically performed, resulting in impairment losses that are reflected in other non-interest expense.

Income taxes

We use the asset and liability method to account for income taxes. The objective of the asset and liability method is to establish deferred tax assets and liabilities for the temporary differences between the financial reporting basis and the income tax basis of our assets and liabilities at enacted tax rates expected to be in effect when such amounts are realized or settled. Our annual tax rate is based on our income, statutory tax rates and available tax planning opportunities. Tax laws are complex and subject to different interpretations by the taxpayer and respective governmental taxing authorities. Significant judgment is required in determining tax expense and in evaluating tax positions, including evaluating uncertainties.

Deferred income tax assets represent amounts available to reduce income taxes payable on taxable income in future years. Such assets arise because of temporary differences between the financial reporting and tax bases of assets and liabilities, as well as from net operating loss carryforwards. We review our deferred tax positions quarterly for changes which may impact realizability. We evaluate the recoverability of these future tax deductions by assessing the adequacy of future expected taxable income from all sources, including reversal of taxable temporary differences, forecasted operating earnings and available tax planning strategies. We use short and long‑range business forecasts to provide additional information for its evaluation of the recoverability of deferred tax assets. It is our policy to recognize interest and penalties associated with uncertain tax positions, if applicable, as components of non‑interest expense.

A deferred tax valuation allowance is established to reduce the net carrying amount of deferred tax assets if it is determined to be more likely than not that all or some of the deferred tax asset will not be realized. See Note 1211 of the notes to our audited consolidated financial statements contained in Item 8 of this report for further information on income taxes.

Recently Issued Accounting Pronouncements

For a discussion of recent accounting pronouncements, including the effective dates of adoption and anticipated effects on our results of operations and finance as condition, see Note 2 of the notes to our audited consolidated financial statements contained in Item 8 of this report.

Primary Factors Used to Evaluate Our Business

As a financial institution, we manage and evaluate various aspects of both our results of operations and our financial condition. We evaluate the levels and trends of the line items included in our consolidated financial statements as well as various financial ratios that are commonly used in our industry. We analyze these ratios and financial trends against our own historical performance, our budgeted performance and the final condition and performance of comparable financial institutions in our region. Comparison of our financial performance against other financial institutions is impacted by the accounting for acquired non‑impairedcredit-deteriorated and acquired impairedpurchased credit deteriorated loans.

These factors and metrics described in this annual report on Form 10-K may not provide an appropriate basis to compare our results or financial condition to the results or financial condition of other financial services companies, given our limited operating history and strategic acquisitions since our recapitalization.

Selected Financial Data.

The following table summarizes certain selected historical consolidated financial data of Byline as of or for the fiscal years ended December 31, 2022, 2021, 2020, and 2019,2020, and is derived from our audited financial statements. You should read this information in conjunction with our consolidated financial statements and related notes included in Item 8 of this report. Management uses the non-GAAP financial measures set forth herein in its analysis of our performance and believes that these non-GAAP financial measures

37

provide useful information to management and investors; however, you should not view these disclosures as a substitute for results determined in accordance with GAAP financial measures.

37