We believe that the primary competitive factors in the mass market are vast selection, visually inspiring browsing, compelling merchandising, ease of product discovery, price, convenience, reliability, speed of fulfillment and customer service. We believe our technological and operational expertise allows us to provide our customers with a vast selection of goods,

We believe we have a good relationship with our employees, which include 16,122 full-time equivalent employees as of December 31, 2017, we had 7,751 full-time equivalent employees.2020. Additionally, we rely on independent contractors and temporary personnel to supplement our workforce, primarily in our logistics network. None of our employees are represented by a labor union or covered by a collective bargaining agreement. We consider

OurWe believe our intellectual property, including any trademarks, service marks, copyrights, domain names, patents, trade dress, trade secrets and proprietary technologies, is an important part of our business. ToWe seek to protect our intellectual property we relyby relying on a combination of lawsfederal, state and regulations,common law rights in the United States and other countries, as well as contractual restrictions. We pursue the registration of our trademarks, including "Wayfair" and certain variations thereon, copyrights and domain names in the U.S. and certain foreign locations. We also rely on the protection of laws regarding unregistered copyrights for our proprietary software and certain other content we create. We will continue to evaluate the merits of applying for copyright registrations in the future. We have an issued patent regarding our proprietary technology and we are evaluating additional patent applications. We expect to consider filing patent applications for future technology inventions. We also rely on trade secret laws to protect our proprietary technology and other intellectual property. To further protect our intellectual property, wegenerally enter into confidentiality and assignment of invention assignment agreements with employees and certain contractors and confidentiality agreements with other third parties, such as suppliers.suppliers, in order to limit access to, and disclosure and use of, our confidential information and proprietary technology. In addition to these contractual arrangements, we also rely on a combination of trademarks, trade dress, domain names, copyrights, trade secrets and patents to help protect our other intellectual property.

We began operating as Smart Tech Toys, Inc., a Massachusetts corporation, in May 2002 and changed our name to CSN Stores, Inc. in February 2003. From 2002 through 2011, the Companycompany was bootstrapped by our co-founders and operated as hundreds of niche websites, such as bedroomfurniture.com and allbarstools.com. In March 2008, we formed, and contributed all of the assets and liabilities of CSN Stores, Inc. to a subsidiary, CSN Stores LLC, and we continued operating our business through this Delaware limited liability company. In late 2011, we made the strategic decision to close and permanently redirect over 240 of our niche websites into Wayfair.com. As part of that shift, we changed the name of CSN Stores, Inc. to SK Retail, Inc. and changed our name from CSN Stores LLC to Wayfair LLC. In connection with our initial public offering, we completed a corporate reorganization, as a result of which Wayfair Inc. was formed to be a holding company with no material assets other than 100% of the equity interests in Wayfair LLC and SK Retail, Inc.

We encourage investors to use our investor relations website, investor.wayfair.com, to find information about us. We promptly make available on this website, free of charge, the reports that we file or furnish with the Securities and Exchange Commission ("SEC"), andas well as corporate governance information (including our Code of Business Conduct and Ethics). We file annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, proxy and information statements and amendments to reports filed or furnished pursuant to Sections 13(a), 14 and 15(d) of the Securities Exchange Act. All material we file with the SEC is publicly available at the SEC's Public Reference Room at 100 F Street NE, Washington, DC 20549. You may obtain information on the operationAct of the SEC's Public Reference Room by calling the SEC at 1-800-SEC-0330. In addition, the1934, as amended (the "Exchange Act"). The SEC maintains a website at www.sec.gov that contains reports, proxy and information statements and other information regarding Wayfair and other issuers that file electronically with the SEC. Our telephone number is (617) 532-6100 and our website and theaddress is www.wayfair.com. The information contained thereinin our website or connected thereto areis not a part of, or incorporated into, this Annual Report on Form 10-K. Further, our references to website URLs are intended to be inactive textual references only.

Our historical growth rates may not be sustainable or indicative of future growth. We believe that our continued revenue growth will depend upon, among other factors, our ability to:

We cannot assure you we will be able to achieve any of the foregoing. Our customer base may not continue to grow or may decline as a result of increased competition and the maturation of our business. Failure to continue our revenue growth rates could have a material adverse effect on our financial condition and results of operations.operating results. You should not rely on our historical rate of revenue growth as an indication of our future performance.

To manage our growth effectively, we must continue to implement our operational plans and strategies, improve and expand our infrastructure of people and information systems and expand, train and manage our employee base. We have rapidly increased employee headcount since our inception to support the growth in our business. To support continued growth, we must effectively integrate, develop and motivate a large number of new employees. If our new hires perform poorly, if we are unsuccessful in hiring, training, managing and integrating these new employees and staff, or if we are not successful in retaining our existing employees and staff, our business may be harmed. Moreover, in February 2020 we implemented reductions in force and may in the future implement other reductions in force. Any reduction in force may yield unintended consequences and costs, such as attrition beyond the intended reduction in force, the distraction of employees, reduced employee morale and adverse effects to our reputation as an employer, which could make it more difficult for us to hire new employees in the future, and the risk that we may not achieve the anticipated benefits from the reduction in force. Properly managing our growth will require us to establish consistent policies across regions and functions, and a failure to do so could likewise harm our business. We also face significant competition for personnel, particularly in the Boston, Massachusetts areaand Berlin, Germany areas where our headquarterslargest corporate offices are located. Failure to manage our hiring needs effectively or successfully integrate our new hires may have a material adverse effect on our business, financial condition and operating results.

Additionally, the growth of our business places significant demands on our operations, as well as our management and other employees. For example, we typically launch hundreds of promotional events across thousands of products each month on our sites via emails, "push" notifications and personalized displays. These events require us to produce updates of our sites and emails to our customers on a daily basis with different products, photos and text. Any surge in online traffic and orders associated with such promotional activities places increased strain on our operations, including our logistics network, and may cause or exacerbate slowdowns or interruptions. The growth of our business may require significant additional resources to meet these daily requirements, which may not scale in a cost-effective manner or may negatively affect the quality of our sites and customer experience. We are also required to manage relationships with a growing number of suppliers, customers and other third parties. Our information technology systems and our internal controls and procedures may not be adequate to support future

Our success depends on our ability to acquire and retain customers in a cost-effective manner. In order to expand our customer base, we must appeal to and acquire customers who have historically used other means of commerce to purchase home goods and may prefer alternatives to our offerings, such as traditional brick and mortar retailers, the websites of our competitors or our suppliers' own websites. We have made significant investments related to customer acquisition and expect to continue to spend significant amounts to acquire additional customers. Our paid advertising efforts consist primarily of online channels, including display advertising, paid search advertising, social media advertising, search engine marketing, displayoptimization, comparison shopping engine advertising, and paid social media, and to a lesser extenttelevision advertising, direct mail, catalog and television advertisements.print advertising. These efforts are expensive and may not result in the cost-effective acquisition of customers. We cannot assure you that the net profit from new customers we acquire will ultimately exceed the cost of acquiring those customers. Additionally, actions by third parties to block or impose restrictions on the delivery of certain advertisements could also adversely impact our business. If we fail to deliver a quality shopping experience, or if consumers do not perceive the products we offer to be of high value and quality, we may not be able to acquire new customers or retain existing customers. If we are unable to acquire new customers who purchase products in numbers sufficient to grow our business, we may not be able to generate the scale necessary to drive beneficial network effects with our suppliers or efficiencies in our logistics network, our net revenue may decrease, and our business, financial condition and operating results may be materially adversely affected.

We believe that many of our new customers originate from word-of- mouthword-of-mouth and other non-paid referrals from existing customers. Therefore, we must ensure that our existing customers remain loyal to us in order to continue receiving those referrals. If our efforts to satisfy our existing customers are not successful, we may not be able to acquire new customers in sufficient numbers to continue to grow our business, or we may be required to incur significantly higher marketing expenses in order to acquire new customers.

We also utilize non-paid advertising. Our non-paid advertising efforts include search engine optimization, non-paid social media, mobile "push" notifications and email. We obtain a significant amount of traffic via search engines and, therefore, rely on search engines such as Google, Bing and Yahoo!. Search engines frequently update and change the logic that determines the placement and display of results of a user's search, such that the purchased or algorithmic placement of links to our sites can be negatively affected. Moreover, a search engine could, for competitive or other purposes, alter its search algorithms or results, causing our sites to place lower in search query results. A major search engine could change its algorithms in a manner that negatively affects our paid or non-paid search ranking, and competitive dynamics could impact the effectiveness of search engine marketing or search engine optimization. We also obtain a significant amount of traffic via social networking websites or other channels used by our current and prospective customers. As e-commerce and social networking continue to rapidly evolve, we must continue to establish relationships with these channels and may be unable to develop or maintain these relationships on acceptable terms. If we are unable to cost-effectively drive traffic to our sites, our ability to acquire new customers or retain our existing customers and our financial condition would suffer.

Our ability to grow our business depends on our ability to retain our existing customer base and generate increased net revenue and repeat purchases from this customer base and maintain high levels of customer engagement. To do this, we must continue to provide our customers and potential customers with a unified, convenient, efficient and differentiated shopping experience by:

If we fail to increase net revenue per active customer, generate repeat purchases or maintain high levels of customer engagement, our growth prospects, operating results and financial condition could be materially adversely affected.

Maintaining and enhancing our brands is critical to expanding our base of customers and suppliers. However,Our ability to maintain and enhance our brand depends largely on our ability to maintain customer confidence in our product and service offerings, including by delivering products on time and without damage. If customers do not have a satisfactory shopping experience, they may seek out alternative offerings from our competitors and may not return to our sites as often in the future, or at all. In addition, unfavorable publicity regarding, for example, our practices relating to privacy and data protection, product quality, delivery problems, competitive pressures, litigation or regulatory activity, could seriously harm our reputation. Such negative publicity also could have an adverse effect on the size, engagement and loyalty of our customer base and result in decreased net revenue, which could adversely affect our business and financial results. A significant portion of our customers' brand experience also depends on third parties outside of our control, including suppliers, assembly and installation service providers and logistics providers such as FedEx, UPS, DHL, the U.S. Postal Service and other third-party delivery agents. If these third parties do not meet our or our customers' expectations, our brands may suffer irreparable damage.

In addition, maintaining and enhancing these brands may require us to make substantial investments, and these investments may not be successful. If we fail to promote and maintain our brands, or if we incur excessive expenses in this effort, our business, operating results and financial condition may be materially adversely affected. We anticipate that, as our market becomes increasingly competitive, maintaining and enhancing our brands may become increasingly difficult and expensive. Maintaining and enhancing our brands will depend largely on our ability to provide high quality products to our customers and a reliable, trustworthy and profitable sales channel to our suppliers, which we may not be able to do successfully.

Customer complaints or negative publicity about our sites, products, delivery times, company practices, employees, customer data handling and security practices or customer support, especially on blogs, social media websites and our sites, could rapidly and severely diminish consumer use of our sites and consumer and supplier confidence in us and result in harm to our brands.

Our business success depends to some extent on our ability to expand our customer offerings by launching new brands and services and by expanding our existing offerings into new geographies. For example, in 2017 we recently launched Perigold,the Kelly Clarkson Home Collection and Hykkon, a number of new house brands,European Union flagship brand, and in 2016 we launched Wayfair.ca in Canada as well as Wayfair Registry, our wedding registry service.Canada. Launching new brands and services or expanding internationally requires significant upfront investments, including investments in marketing, information technology and additional personnel. Expanding our brands internationally is particularly challenging because it requires us to gain country-specific knowledge about consumers, regional competitors and local laws, construct catalogs specific to the country, build local logistics capabilities and customize portions of our technology for local markets. We may not be able to generate satisfactory net revenue from these efforts to offset these costs. Any lack of market acceptance of our efforts to launch new brands and services or to expand our existing offerings could have a material adverse effect on our business, prospects, financial condition and results of operations.operating results. Further, as we continue to expand our fulfillment capability or add new businesses with different requirements, our logistics networks become increasingly complex and operating them becomes more challenging. There can be no assurance that we will be able to operate our networks effectively.

We have also entered and may continue to enter into new markets in which we have limited or no experience, which may not be successful or appealing to our customers. These activities may present new and difficult technological and logistical challenges, and resulting service disruptions, failures or other quality issues may cause customer dissatisfaction and harm our reputation and brand. Further, our current and potential competitors in new market segments may have greater brand recognition, financial resources, longer operating histories and larger customer bases than we do in these areas. As a result, we may not be successful enough in these newer areas to recoup our investments in them. If this occurs, our business, financial condition and operating results may be materially adversely affected.

We believe international expansion represents a significant growth opportunity for us. Today, weWe currently deliver products to customers in a number of countries, and plan to expand into other international markets in order to grow our business, which will require significant management attention and resources. For example, we have made and will continue to make significant investments in information technology, logistics, supplier relationships, merchandising and marketing in the foreign jurisdictions in which we operate or plan to operate. We have limited experience in selling our products to conform to different local cultures, standards and regulations, and the products we offer may not appeal to customers in the same manner, if at all, in other geographies. We may have to compete with local companies whichwho understand the local market better than we do and/or may have greater brand recognition than we do. In addition, to deliver satisfactory performance for customers in international locations, it may be necessary to locate physical facilities, such as consolidation centers and warehouses, in foreign markets, and we may have to invest in these facilities before we can determine whether or not our foreign operations are successful. We have limited experience establishing such facilities internationally and therefore may decide not to continue with the expansion of international operations. We may not be successful in expanding into additional international markets or in generating net revenue

Our future results could be materially adversely affected by a number of factors inherent in international operations, including:

Operating internationally requires significant management attention and financial resources. We cannot be certain that the investment and additional resources required to establish and expand our international operations will produce desired levels of net revenue or profitability. If we invest substantial time and resources to establish and expand our international operations and are unable to do so successfully and in a timely manner, our business, financial condition and operating results may be materially adversely affected.

We expect competition in e-commerce generally to continue to increase. We believe that our ability to compete successfully depends upon many factors both within and beyond our control, including:

In order to attract quality suppliers to our platform, we must:

If we are unable to provide our suppliers with a compelling return on investment and an ability to increase their sales, we may be unable to maintain and/or expand our supplier network, which would negatively impact our business.

As part of offering our suppliers' products for sale on our sites, these suppliers are often responsible for conducting a number of traditional retail operations with respect to their respective products, including maintaining inventory and preparing merchandise for shipment to our customers. In these instances, we may be unable to ensure that these suppliers will continue to perform these services to our or our customers' satisfaction in a manner that provides our customer with a unified brand experience or on commercially reasonable terms. If our customers become dissatisfied with the services provided by our suppliers, our business, reputation and brands could suffer.

The Sarbanes-Oxley Act of 2002 requires that we maintain effective internal control over financial reporting and disclosure controls and procedures. In particular, we must perform system and process evaluation, document our controls and perform testing of our key control over financial reporting to allow management and our independent public accounting firm to report on the effectiveness of our internal control over financial reporting, as required by Section 404 of the Sarbanes-Oxley Act. Our testing, or the subsequent testing by our independent public accounting firm, may reveal deficiencies in our internal control over financial reporting that are deemed to be material weaknesses. If we are not able to comply with the requirements of Section 404 in a timely manner, or if we or our accounting firm identify deficiencies in our internal control over financial reporting that are deemed to be material weaknesses, the market price of our stock would likely decline and we could be subject to lawsuits, sanctions or investigations by regulatory authorities, including SEC enforcement actions, and we could be required to restate our financial results, any of which would require additional financial and management resources.

We continue to invest in more robust technology and in more resources in order to manage those reporting requirements. Implementing the appropriate changes to our internal controls may distract our officers and employees, result in substantial costs and require significant time to complete. Any difficulties or delays in implementing these controls could impact our ability to timely report our financial results. For these reasons, we may encounter difficulties in the timely and accurate reporting of our financial results, which would impact our ability to provide our investors with information in a timely manner. As a result, our investors could lose confidence in our reported financial information, and our stock price could decline.

In addition, any such changes do not guarantee that we will be effective in maintaining the adequacy of our internal controls, and any failure to maintain that adequacy could prevent us from accurately reporting our financial results.

Net revenueOur financial and operating results are inherently uncertain and difficult to forecast because they generally depend on the volume, timing and type of orders we receive, all of which are uncertain. We base our expense levels and investment plans on our estimates of total net revenue and gross margins. WeIn particular, we cannot be sure the samethat our historical growth rates, trends and other key performance metrics are meaningful predictors of future growth. If our assumptions prove to be wrong, we may spend more than we anticipate acquiring and retaining customers or may generate less net revenue per active customer than anticipated, any of which could have a negative impact on our business and results of operations.

In the future, we could be required to or may decide to raise capital through public or private financing or other arrangements. Such financing may not be available on acceptable terms, or at all, and our failure to raise capital when needed or desired could harm our business. Our ability to raise additional capital, if and when required, will depend on, among other factors, investor demand, our operating performance, our credit rating and the condition of the capital markets. We may sell Class A common stock, convertible securities and other equity securities in one or more transactions at prices and in a manner as we may determine from time to time. If we sellOur convertible notes are and any suchfuture issuance of equity or equity-linked securities in subsequent transactions,would be dilutive to holders of our Class A common stock, including holders of any Class A common stock issued upon conversion of our convertible notes, may be materially diluted.stock. New investors in such subsequent transactions could gain rights, preferences and privileges senior to those of holders of our Class A common stock.stock or our convertible notes. Debt financing, if available, may involve restrictive covenants and could reduce our operational flexibility or profitability. If we cannot raise funds on acceptable terms, we may not be able to grow our business or respond to competitive pressures.

The number of people who access the Internet through devices other than personal computers, including mobile phones, smartphones, smartwatches, handheld computers such as notebooks and tablets, video game consoles and television set-top devices, has increased dramatically in the past few years. We continually upgrade existing technologies and business applications to keep pace with these rapidly changing and continuously evolving technologies, and we may be required to implement new technologies or business applications in the future. The implementation of these upgrades and changes requires significant investments and as new devices, operating systems and platforms are released, it is difficult to predict requirements or the problems we may encounter in developing applications for these alternative devices, operating systems and platforms. Additionally, we may need to devote significant resources to the support and maintenance of such applications once created. Our results of operations may be affected by the timing, effectiveness and costs associated with the successful implementation of any upgrades or changes to our systems and infrastructure to accommodate such alternative devices, operating systems and platforms. Further, in the event that it is more difficult or less compelling for our customers to buy products from us on their mobile or other devices, or if our customers choose not to buy products from us on such devices or to use mobile or other products that do not

We allow our customers to return products, subject to our return policy. If merchandise returns are significant, our business, prospects, financial condition and results of operations could be harmed. Further, we modify our policies relating to returns from time to time, which may result in customer dissatisfaction or an increase in the number of product returns. Many of our products are large and require special handling and delivery. From time to time our products are damaged in transit, which can increase return rates and harm our brand.

Consumers may view a substantial portion of the products we offer as discretionary items rather than necessities. As a result, our operating results of operations are sensitive to changes in macro-economic conditions that impact consumer spending, including discretionary spending. Some of the factors adversely affecting consumer spending include levels of unemployment,unemployment; consumer debt levels,levels; changes in net worth based on market changes and uncertainty,uncertainty; home foreclosures and changes in home values or the overall housing, residential construction or home improvement markets; fluctuating interest rates,rates; credit availability, including mortgages, home equity loans and consumer credit; government actions,actions; fluctuating fuel and other energy costs,costs; fluctuating commodity prices and general uncertainty regarding the overall future economic environment. Adverse economic changes in any of the regions in which we sell our products could reduce consumer confidence and could negatively affect net revenue and have a material adverse effect on our operating results.

Our business is highly dependent upon email and other messaging services for promoting our sites and products. Daily promotions offered through emails and other messages sent by us, or on our behalf by our vendors, generate a significant portion of our net revenue. We provide daily emails and "push" communications to customers and other visitors informing them of what is available for purchase on our sites that day, and we believe these messages are an important part of our customer experience and help generate a substantial portion of our net revenue. If we are unable to successfully deliver emails or other messages to our subscribers, or if subscribers decline to open our emails or other messages, our net revenue and profitability would be materially adversely affected. Changes in how webmail applications organize and prioritize email may also reduce the number of subscribers opening our emails. For example, in 2013 Google Inc.'sGoogle's Gmail service began offeringhas a feature that organizes incoming emails into categories (for example, primary, social and promotions). Suchsuch categorization or similar inbox organizational features may result in our emails being delivered in a less prominent location in a subscriber's inbox or viewed as "spam" by our subscribers and may reduce the likelihood of that subscriber opening our emails. Actions by third parties to block, impose restrictions on or charge for the delivery of emails or other messages could also adversely impact our business. From time to time, Internet service providers or other third parties may block bulk email transmissions or otherwise experience technical difficulties that result in our inability to successfully deliver emails or other messages to third parties. Changes in the laws or regulations that limit our ability to send such communications or impose additional requirements upon us in connection with sending such communications would also materially adversely impact our business. Our use of email and other messaging services to send communications about our sites or other matters may also result in legal claims against us, which may cause us increased expenses, and if successful might result in fines and orders with costly reporting and compliance obligations or might limit or prohibit our ability to send emails or other messages. We also rely on social networking messaging services to send communications and to encourage customers to send communications. Changes to the terms of these social networking services to limit promotional communications, any restrictions that would limit our ability or our customers' ability to send communications through their services, disruptions or downtime experienced by these social networking services or decline in the use of or engagement with social networking services by customers and potential customers could materially adversely affect our business, financial condition and operating results.

We accept payments using a variety of methods, including credit card, debit card, PayPal, credit accounts (including promotional financing), gift cards and gift cards.customer invoicing. We rely on third parties to provide many of these payment methods and payment processing services, including certain Wayfair-branded programs and promotional financing. As we offer new payment options to consumers, we may be subject to additional regulations, compliance requirements and fraud. For certain payment methods, including credit and debit cards, we pay interchange and other fees, which may increase over time and raise our operating costs and lower profitability. We also offer private label and/or co-branded credit card programs, which could adversely

We occasionally receive orders placed with fraudulent credit card data. We may suffer losses as a result of orders placed with fraudulent credit card data even if the associated financial institution approved payment of the orders. Under current credit card practices, we may be liable for fraudulent credit card transactions. We may also suffer losses from other online transaction fraud, including fraudulent returns. If we are unable to detect or control credit card or transaction fraud, our liability for these transactions could harm our business, financial condition and results of operations.

As part of our business strategy, we may acquire other companies, businesses or businesses.assets. However, we may not be able to find suitable acquisition candidates, and we may not be able to complete acquisitions on favorable terms, if at all. Acquisitions involve numerous risks, any of which could harm our business, including: difficulties in integrating the technologies, operations, existing contracts and personnel of an acquired company; difficulties in supporting and transitioning customers and suppliers, if any, of an acquired company; diversion of financial and management resources from existing operations or alternative acquisition opportunities; failure to realize the anticipated benefits or synergies of a transaction; failure to identify all of the problems, liabilities or other shortcomings or challenges of an acquired company or technology, including issues related to intellectual property, regulatory compliance practices, liabilities related to data security and privacy of customer data, the acquired company's internal controls over financial reporting, including revenue recognition or other accounting practices orpractices; employee or customer issues; risks of entering new markets in which we have limited or no experience; potential loss of senior management or other key employees, customers and suppliers from either our current business or an acquired company's business; inability to generate sufficient net revenue to offset acquisition costs; additional costs or equity dilution associated with funding the acquisition; and possible write-offs or impairment charges relating to acquired businesses.businesses, and these liabilities may be greater than the warranty and indemnity limitations we negotiate.

In addition, our investments in properties may not be fully realized. We continually review our operations and facilities in an effort to reduce costs and increase efficiencies. For strategic or other operational reasons, we may decide to consolidate or co-locate certain aspects of our business operations or dispose of one or more of our properties. If we decide to fully or partially vacate a leased property, we may incur significant cost,costs, including facility closing costs, employee separation and retention expenses, lease termination fees, rent expense in excess of sublease income, and impairment ofcharges for right-of-use ("ROU") assets and leasehold improvements and accelerated depreciation of assets. Any of these events may materially adversely affect our business, financial condition and operating results.

We believe our success has depended, and continues to depend, on the efforts and talents of Niraj Shah, one of our co-founders, co-chairman of the board of directors (the "Board") and our Chief Executive Officer, Steven Conine, one of our co-founders and co-chairman of the board of directors,Board and the other members of our senior management team. The loss of any of our senior management or other key employees could materially harm our business. Our future success also depends on our continuing ability to attract, develop, motivate and retain highly qualified and skilled employees, particularly mid-level managers, engineers and merchandising and technology personnel. The market for such positions in the Boston area and other cities in which we operate is competitive. Qualified individuals are in high demand, and we may incur significant costs to attract them. In addition, the loss of any of our senior management or key employees or ourOur inability to recruit and develop mid-level managers could materially adversely affect our ability to execute our business plan, and we may not be able to find adequate replacements. All of our officers and other U.S. employees are at-will employees, meaning that they may terminate their employment relationship with us at any time, and their knowledge of our business and industry would be extremely difficult to replace. If we do not succeed in attracting well-qualified employees or retaining and motivating existing employees, our business, financial condition and operating results may be materially adversely affected.

We regard our customer lists, trademarks, domain names, copyrights, patents, trade dress, trade secrets, proprietary technology and similar intellectual property as critical to our success, and we rely on trademark, copyright and patent law, trade secret protection, agreements and other methods with our employees and others to protect our proprietary rights. We might not be able to obtain broad protection in the U.S. or internationally for all of our intellectual property, and we might not be able to obtain effective intellectual property protection in every country in which we sell products or perform services. For example, we are the registrant of marks for our brands in numerous jurisdictions and of the Internet domain name for the websites of Wayfair.com, Wayfair.ca, Wayfair.co.uk, Wayfair.de and our other sites, as well as various related domain names. However, we have not registered our marks or domain names in all major international jurisdictions and may not be able to register or use such domain names in all of the countries in which we currently or intend to conduct business. Further, we might not be able to prevent third parties from registering, using or retaining domain names that interfere with our consumer communications or infringe or otherwise decrease the value of our marks, domain names and other proprietary rights.

The protection of our intellectual property rights may require the expenditure of significant financial, managerial and operational resources. We may initiate claims or litigation against others for infringement, misappropriation or violation of our intellectual property rights or proprietary rights or to establish the validity of such rights. Any litigation, whether or not it is resolved in our favor, could result in significant expense to us and divert the efforts of our technical and management personnel, which may materially adversely affect our business, financial condition and operating results. Moreover, the steps we take to protect our intellectual property may not adequately protect our rights or prevent third parties from infringing or misappropriating our proprietary rights, and we may not be able to broadly enforce all of our trademarks or patents. Any of our patents, marks or other intellectual property rights may be challenged by others or invalidated through administrative process or litigation. Our patent and trademark applications may never be granted. Additionally, the process of obtaining intellectual property protections is expensive and time-consuming, and we may not be able to pursue all necessary or desirable actions at a reasonable cost or in a timely manner. Even if issued, there can be no assurance that these protections will adequately safeguard our intellectual property, as the legal standards relating to the validity, enforceability and scope of protection of patent and other intellectual property rights are uncertain. We also cannot be certain that others will not independently develop or otherwise acquire equivalent or superior technology or intellectual property rights. We may also be exposed to claims from third parties claiming infringement of their intellectual property rights, or demanding the release or license of open source software or derivative works that we developed using such software (which could include our proprietary code) or otherwise seeking to enforce the terms of the applicable open source license. These claims could result in litigation and could require us to purchase a costly license, publicly release the affected portions of our source code, be limited in or cease using the implicated software unless and until we can re-engineer such software to avoid infringement or change the use of the implicated open source software.

The e-commerce industry is characterized by vigorous protection and pursuit of intellectual property rights, which has resulted in protracted and expensive litigation for many companies. We are subject to claims and litigation by third parties that we infringe their intellectual property rights, and we expect additional claims and litigation with respect to infringement to occur in the future. The costs of supporting such litigation and disputes are considerable, and there can be no assurances that favorable outcomes will be obtained. As our business expands and the number of competitors in our market increases and overlaps occur, we expect that infringement claims may increase in number and significance. Any claims or proceedings against us, whether meritorious or not, could be time-consuming, result in considerable litigation costs, require significant amounts of management time or result in the diversion of significant operational resources, any of which could materially adversely affect our business, financial condition and operating results.

Legal claims regarding intellectual property rights are subject to inherent uncertainties due to the oftentimes complex issues involved, and we cannot be certain that we will be successful in defending ourselves against such claims. In addition, some of our larger competitors have extensive portfolios of issued patents. Many potential litigants, including patent holding companies, have the ability to dedicate substantially greater resources to enforce their intellectual property rights and to defend claims that may be brought against them. Furthermore, a successful claimant could secure a judgment that requires us to pay substantial damages or prevents us from conducting our business as we have historically done or may desire to do in the future. We might also be required to seek a license and pay royalties for the use of such intellectual property, which may not be available on commercially acceptable terms, or at all. Alternatively, we may be required to develop non-infringing technology or intellectual property, which could require significant effort and expense and may ultimately not be successful.

We have received in the past, and we may receive in the future, communications alleging that certain items posted on or sold through our sites violate third-party copyrights, designs, marks and trade names or other intellectual property rights or other

Such claims, whether or not meritorious, may result in the expenditure of significant financial, managerial and operational resources, injunctions against us or the payment of damages by us. We may need to obtain licenses from third parties who allege that we have violated their rights, but such licenses may not be available on terms acceptable to us, or at all. These risks have been amplified by the increase in third parties whose sole or primary business is to assert such claims.

If we do not generate sufficient cash flow from operations, and additional borrowings, refinancings or proceeds from asset sales are not available to us, we may not have sufficient cash to enable us to meet all of our obligations, including our obligations under the Notes.

Our Class B common stock has ten votes per share, and our Class A common stock, which is the stock that is publicly traded, has one vote per share. Following our initial public offering (the "IPO"), our Class B common stock was held primarily by our co-founders, other executive officers, directors and their affiliates. Due to optional conversions of Class B common stock into Class A common stock following the IPO, our Class B common stock is currently held primarily by our co-founders and their affiliates. As of December 31, 2017,2020, our co-founders and their affiliates owned shares representing approximately 35.7%28.0% of the economic interest and 84.4%78.7% of the voting power of our outstanding capital stock. This concentrated control limits your ability to influence corporate matters for the foreseeable future. For example, these stockholders are able to control elections of directors, amendments of our certificate of incorporation or bylaws, increases to the number of shares available for issuance under our equity incentive plans or adoption of new equity incentive plans and approval of any merger or sale of assets for the foreseeable future. This control may materially adversely affect the market price of our Class A common stock. Additionally, holders of our Class B common stock may cause us to make strategic decisions or pursue acquisitions that could involve risks to you or may not be aligned with your interests. The holders of our Class B common stock are also entitled to a separate vote in the eventif we seek to amend our certificate of incorporation to increase or decrease the par value of a class of our common stock or in a manner that alters or changes the powers, preferences or special rights of the Class B common stock in a manner that affects its holders adversely.

Future transfers by holders of Class B common stock will generally result in those shares converting on a 1:1 basis to Class A common stock, which will have the effect, over time, of increasing the relative voting power of those holders of Class B common stock who retain their shares in the long-term, which may include our executive officers.

In addition, stock markets have experienced extreme price and volume fluctuations that have affected and continue to affect the market prices of equity securities of many technology companies, including e-commerce companies. Stock prices of many technology companies, including e-commerce companies, have fluctuated in a manner unrelated or disproportionate to the operating performance of those companies. Volatility in our stock price could adversely affect our business and financing opportunities and expose us to litigation. Securities litigation can subject us to substantial costs, divert resources and the attention of management from our business and materially adversely affect our business, financial condition and operating results.

We believe our Class A common stock has been the subject of significant short selling efforts by certain market participants. Short sales are transactions in which a market participant sells a security that it does not own. To complete the transaction, the market participant must borrow the security to make delivery to the buyer. The market participant is then obligated to replace the security borrowed by purchasing the security at the market price at the time of required replacement. If the price at the time of replacement is lower than the price at which the security was originally sold by the market participant, then the market participant will realize a gain on the transaction. Thus, it is in the market participant’s interest for the market price of the underlying security to decline as much as possible during the period prior to the time of replacement. Short selling may negatively affect the value of our stock to the detriment of our stockholders.

In addition, market participants with disclosed short positions in our stock have published, and may in the future continue to publish, negative information regarding us that we believe is inaccurate and misleading. We believe that the publication of this negative information may in the future lead to downward pressure on the price of our stock.

Sales of a substantial number of shares of our Class A common stock in the public market, or the perception that these sales might occur, could depress the market price of our Class A common stock and could impair our ability to raise capital through the sale of additional equity securities. We are unable to predict the effect that such sales may have on the prevailing market price of our Class A common stock.

The trading market for our Class A common stock depends in part on the research and reports that securities or industry analysts publish about us or our business, our market and our competitors. We do not have any control over these analysts. If one or more of the analysts who cover us downgrade our shares or change their opinion of our shares, our share price would likely decline. If one or more of these analysts cease coverage of our company or fail to regularly publish reports on us, we could lose visibility in the financial markets, which could cause our share price or trading volume to decline.

Our management generally has broad discretion over the use of our cash resources, and you will be relying on the judgment of our management regarding the application of these resources. Our management might not apply these resources in ways that increase the value of your investment.