UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DCD.C. 20549

FORM 10-Q

(Mark One)


☒	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, ~~2020~~2021


☐	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from ________ to ________

Commission file number: 001-36182

Xencor, Inc.

(Exact ~~Name~~name of ~~Registrant~~registrant as ~~Specified~~specified in its ~~Charter)~~charter)


Delaware		20-1622502
(State or ~~Other Jurisdiction~~other jurisdiction of ~~Incorporation~~incorporation or ~~Organization)~~organization)		(I.R.S. Employer Identification No.)

111 West Lemon Avenue, Monrovia, CA		91016
(Address of ~~Principal Executive Offices)~~principal executive offices)		(Zip Code)

(626) 305-5900

(Registrant’s ~~Telephone Number, Including Area Code)~~telephone number, including area code)

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


Title of each class:	Trading ~~Symbol~~Symbol(s)	Name of each exchange on which registered:
Common Stock, par value $0.01 per share	XNCR	~~NASDAQ~~Nasdaq Global Market

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 definitions of “large accelerated filer”, “accelerated filer”, “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer ⌧ Accelerated filer ◻ Non-accelerated filer ◻ Smaller reporting company ☐ Emerging growth company ☐

If an emerging growth company, indicate by ~~checkmark~~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 is a shell company (as defined in Rule 12b-2 of the Securities Exchange Act of 1934). Yes ☐ No ☒

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date:


Class		Outstanding at April ~~29, 2020~~26, 2021
Common stock, $0.01 par value		~~57,004,786~~58,224,616

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Xencor, Inc.

Quarterly Report on ~~FORM~~Form 10-Q for the Quarter Ended March 31, ~~2020~~2021

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		Page

	SPECIAL NOTE REGARDING ~~FORWARD LOOKING~~FORWARD-LOOKING STATEMENTS	3
PART I.	FINANCIAL INFORMATION	5
Item 1.	Financial Statements	5
	Balance Sheets as of March 31, ~~2020~~2021 (unaudited) and December 31, ~~2019~~2020	5
	Statements of Comprehensive Income (Loss) for the Three Months Ended March 31, ~~2020~~2021 and ~~2019~~2020 (unaudited)	6
	~~Statement~~Statements of Stockholders’ Equity for the Three Months Ended March 31, ~~2020~~2021 and ~~2019~~2020 (unaudited)	7
	Statements of Cash Flows for the Three Months Ended March 31, ~~2020~~2021 and ~~2019~~2020 (unaudited)	8
	Notes to Financial Statements (unaudited)	9
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	2526
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	3335
Item 4.	Controls and Procedures	3436

PART II.	OTHER INFORMATION	3537
Item 1.	Legal Proceedings	3537
Item 1A.	Risk Factors	3537
Item 6.	Exhibits	3738

Signatures		3839

In this report, unless otherwise stated or the context otherwise indicates, references to “Xencor,” “the Company,” “we,” “us,” “our” and similar references refer to Xencor, Inc. The Xencor logo is a registered trademark of Xencor, Inc. This report also contains registered marks, trademarks and trade names of other companies. All other trademarks, registered marks and trade names appearing in this report are the property of their respective holders.

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SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of ~~federal securities laws.~~Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. You should not place undue reliance on these statements. We have based these forward-looking statements largely on our current expectations and projections about future events and financial trends affecting the financial condition of our business. Forward-looking statements should not be read as a guarantee of future performance or results and will not necessarily be accurate indications of the times at, or by, which such performance or results will be achieved. Forward-looking statements are based on information available at the time those statements are made and/or management’s good faith belief as of that time with respect to future events, and are subject to risks and uncertainties that could cause actual performance or results to differ materially from those expressed in or suggested by the forward-looking statements. Our actual results could differ materially from those anticipated in these forward-looking statements as a result of various factors, including those set forth below under Part II, Item 1A, “Risk Factors” in this Quarterly Report. These statements, which represent our current expectations or beliefs concerning various future events, may contain words such as “may,” “will,” “expect,” “anticipate,” “intend,” “plan,” “believe,” ~~“estimate”~~“estimate,” the negative of such terms or other words indicating future results. ~~Such statements may include, but are not limited to, statements concerning the following:~~

These forward-looking statements should, therefore, be considered in light of various important factors, including but not limited to, the following:

●

the effects of the ongoing COVID-19 pandemic on our financial condition, results of operations, cash flows and performance;

●

our ability to execute on our plans to research, develop and commercialize our product candidates;

●

the success of our ongoing and planned clinical trials;

●

the timing of and our ability to obtain and maintain regulatory approvals for our product candidates;

●

our ~~estimates regarding~~ability to accurately estimate expenses, future revenue, capital requirements and needs for additional financing;

●

our ability to identify additional products or product candidates with significant commercial potential that are consistent with our business objectives;

●

our ability to receive research funding and achieve anticipated milestones under our collaborations;

●

our ability to attract collaborators with development, regulatory, and commercial expertise;

●

our ability to protect our intellectual property position;

●

the rate and degree of market acceptance and clinical utility of our products;

●

costs of compliance and our failure to comply with new and existing governmental regulations;

●

the capabilities and strategy of our suppliers and vendors including key manufacturers of our clinical drug supplies;

●

significant competition in our industry;

●

costs of litigation and the failure to successfully defend lawsuits and other claims against us;

●

~~our partners’ ability to advance drug candidates into, and successfully complete, clinical trials;~~

●

~~our ability to receive research funding and achieve anticipated milestones under our collaborations;~~

●

~~our intellectual property position;~~

●

the potential loss or retirement of key members of management;

●

~~costs of compliance and~~ our ~~failure to comply with new and existing governmental regulations;~~

●

failure to successfully execute our growth strategy, including any delays in our planned future growth; ~~and~~

●

our failure to maintain effective internal ~~controls.~~controls; and

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●

our ability to accurately estimate expenses, future revenues, capital requirements and needs for additional financing.

The factors, risks and uncertainties referred to above and others are more fully described under the heading “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, ~~2019~~2020 and this Quarterly Report on Form 10-Q. Forward-looking statements should be regarded solely as our current plans, estimates and beliefs. We cannot guarantee future results, events, levels of activity, performance or achievements. We do not undertake and specifically decline any obligation to update, republish or revise forward-looking statements to reflect future events or circumstances or to reflect the occurrences of unanticipated events.

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PART I — FINANCIAL INFORMATION

Item1. Financial Statements

Xencor, Inc.

Balance Sheets

(Inin thousands, except share ~~amounts)~~and per share data)


	March 31,		December 31,		March 31,		December 31,
	2020		2019		2021		2020
	(unaudited)				(unaudited)
Assets
Current assets
Cash and cash equivalents	$	73,808	$	50,312	$	176,965	$	163,544
Marketable securities		497,841		479,470		368,878		434,156
Equity securities		2,253		—		6,136		5,303
Accounts receivable		6,825		21,574		12,525		11,443
Income tax receivable		904		502
Contract asset						12,500		12,500
Prepaid expenses and other current assets		6,476		6,547		14,164		10,726
Total current assets		588,107		558,405		591,168		637,672
Property and equipment, net		16,799		15,805		22,301		21,682
Patents, licenses, and other intangible assets, net		14,637		14,421		15,550		15,977
Marketable securities - long term		38,232		71,526		25,082		1,030
Income tax receivable		—		402
Equity securities - long term						28,219		16,071
Other assets		9,188		9,691		10,417		10,812
Total assets	$	666,963	$	670,250	$	692,737	$	703,244
Liabilities and stockholders’ equity
Current liabilities
Accounts payable	$	10,313	$	10,189	$	7,663	$	8,954
Accrued expenses		7,292		8,995		12,513		17,603
Lease liabilities		2,136		2,169		1,934		1,889
Deferred revenue		46,176		45,205		77,821		92,615
Total current liabilities		65,917		66,558		99,931		121,061
Lease liabilities, net of current portion		8,041		8,565		9,194		9,739
Deferred revenue, net of current portion		—		1,926
Total liabilities		73,958		77,049		109,125		130,800
Commitments and contingencies
Stockholders’ equity
Preferred stock, $0.01 par value: 10,000,000 authorized shares; -0- issued and outstanding shares at March 31, 2020 and December 31, 2019		—		—
Common stock, $0.01 par value: 200,000,000 authorized shares at March 31, 2020 and December 31, 2019; 57,001,253 issued and outstanding at March 31, 2020 and 56,902,301 issued and outstanding at December 31, 2019		570		569
Preferred stock, $0.01 par value: 10,000,000 authorized shares; -0- issued and outstanding shares at March 31, 2021 and December 31, 2020						—		—
Common stock, $0.01 par value: 200,000,000 authorized shares at March 31, 2021 and December 31, 2020; 58,221,953 issued and outstanding at March 31, 2021 and 57,873,444 issued and outstanding at December 31, 2020						583		580
Additional paid-in capital		895,855		887,873		951,154		937,525
Accumulated other comprehensive income (loss)		1,056		1,161
Accumulated other comprehensive income						97		74
Accumulated deficit		(304,476)		(296,402)		(368,222)		(365,735)
Total stockholders’ equity		593,005		593,201		583,612		572,444
Total liabilities and stockholders’ equity	$	666,963	$	670,250	$	692,737	$	703,244

See accompanying notes.

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Xencor, Inc.

Statements of Comprehensive Income (Loss)

(unaudited)

(Inin thousands, except share and per share data)


	Three Months Ended				Three Months Ended
	March 31,				March 31,
	2020		2019		2021		2020

Revenue
Collaborations, licenses, milestones, and royalties	$	32,385	$	111,939	$	33,965	$	32,385
Operating expenses
Research and development		33,943		28,183		41,411		33,943
General and administrative		7,219		5,512		8,226		7,219
Total operating expenses		41,162		33,695		49,637		41,162
Income (loss) from operations		(8,777)		78,244
Loss from operations						(15,672)		(8,777)
Other income (expenses)
Interest income, net		3,039		2,886		215		3,039
Other expense, net		(2,336)		(185)
Other income (expense), net						12,970		(2,336)
Total other income, net		703		2,701		13,185		703

Net income (loss) before income tax expense		(8,074)		80,945
Income tax expense		—		900
Net income (loss)		(8,074)		80,045
Net loss						(2,487)		(8,074)

Other comprehensive income (loss)
Net unrealized gain (loss) on marketable securities		(105)		1,316		23		(105)
Comprehensive income (loss)	$	(8,179)	$	81,361
Comprehensive loss					$	(2,464)	$	(8,179)

Basic net income (loss) per common share	$	(0.14)	$	1.42
Diluted net income (loss) per common share	$	(0.14)	$	1.38
Basic and diluted net loss per common share					$	(0.04)	$	(0.14)

Basic weighted average common shares outstanding		56,946,714		56,302,967

Diluted weighted average common shares outstanding		56,946,714		58,009,878
Basic and diluted weighted average common shares outstanding						57,997,313		56,946,714

See accompanying notes.

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Xencor, Inc.

~~Statement~~Statements of Stockholders’ Equity

(unaudited)

(in thousands, except share data)


																	Accumulated
															Additional		Other				Total
												Common Stock			Paid-in		Comprehensive		Accumulated		Stockholders’
Stockholders’ Equity												Shares	Amount		Capital		Income (Loss)		Deficit		Equity
Balance, December 31, 2020												57,873,444		580		937,525		74		(365,735)		572,444
Issuance of common stock upon exercise of stock awards												230,701		2		5,337		—		—		5,339
Issuance of restricted stock units												117,808		1		(1)		—		—		—
Comprehensive income (loss)												—		—		—		23		(2,487)		(2,464)
Stock-based compensation												—		—		8,293		—		—		8,293
Balance, March 31, 2021												58,221,953	$	583	$	951,154	$	97	$	(368,222)	$	583,612

						Accumulated											Accumulated
				Additional		Other				Total					Additional		Other				Total
	Common Stock			Paid		Comprehensive		Accumulated		Stockholders’		Common Stock			Paid-in		Comprehensive		Accumulated		Stockholders’
Stockholders’ Equity	Shares	Amount		in-Capital		Income (Loss)		Deficit		Equity		Shares	Amount		Capital		Income (Loss)		Deficit		Equity
Balance, December 31, 2019	56,902,301		569		887,873		1,161		(296,402)		593,201	56,902,301		569		887,873		1,161		(296,402)		593,201
Issuance of common stock upon exercise of stock awards	79,930		1		1,470		—		—		1,471	79,930		1		1,470		—		—		1,471
Issuance of restricted stock units	19,022		—		—		—		—		—	19,022		—		—		—		—		—
Comprehensive loss	—		—		—		(105)		(8,074)		(8,179)	—		—		—		(105)		(8,074)		(8,179)
Stock-based compensation	—		—		6,512		—		—		6,512	—		—		6,512		—		—		6,512
Balance, March 31, 2020	57,001,253	$	570	$	895,855	$	1,056	$	(304,476)	$	593,005	57,001,253	$	570	$	895,855	$	1,056	$	(304,476)	$	593,005

						Accumulated
				Additional		Other				Total
	Common Stock			Paid		Comprehensive		Accumulated		Stockholders’
Stockholders’ Equity	Shares	Amount		in-Capital		Income (Loss)		Deficit		Equity
Balance, December 31, 2018	56,279,542		563		845,366		(971)		(323,277)		521,681
Issuance of common stock upon exercise of stock awards	58,536		1		666		—		—		667
Issuance of restricted stock units	11,311		—		—		—		—		—
Comprehensive income	—		—		—		1,316		80,045		81,361
Stock-based compensation	—		—		5,856		—		—		5,856
Balance, March 31, 2019	56,349,389	$	564	$	851,888	$	345	$	(243,232)	$	609,565

See accompanying notes.

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Xencor, Inc.

Statements of Cash Flows

(unaudited)

(in thousands)


	Three Months Ended				Three Months Ended
	March 31,				March 31,
	2020		2019		2021		2020
Cash flows from operating activities
Net income (loss)	$	(8,074)	$	80,045
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Net loss					$	(2,487)	$	(8,074)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization		1,373		996		1,638		1,373
Accretion of discount on marketable securities		(573)		(601)
Amortization of premium (accretion of discount) on marketable securities						865		(573)
Stock-based compensation		6,512		5,856		8,293		6,512
Abandonment of capitalized intangible assets		28		58		193		28
Equity received in connection with license agreement		(4,589)		—		—		(4,589)
Change in fair value of equity security		2,336		—		(12,980)		2,336
Changes in operating assets and liabilities:
Accounts receivable		14,749		(127,489)		(1,082)		14,749
Interest receivable		215		31		311		215
Contract asset and deposits						(62)		—
Prepaid expenses and other assets		71		942		(3,438)		71
Accounts payable		124		1,689		(1,291)		124
Accrued expenses		(1,703)		(3,957)		(5,090)		(1,703)
Income taxes		—		900
Lease liabilities and ROU assets		(54)		(259)
Lease liabilities and right of use (ROU) assets						(42)		(54)
Deferred revenue		(955)		23,061		(14,794)		(955)
Net cash provided by (used in) operating activities		9,460		(18,728)
Net cash (used in) provided by operating activities						(29,966)		9,460
Cash flows from investing activities
Purchase of marketable securities		(142,477)		(49,856)		(84,139)		(142,477)
Purchase of intangible assets		(538)		(1,051)		(72)		(538)
Purchase of property and equipment		(2,073)		(415)		(1,951)		(2,073)
Proceeds from maturities of marketable securities		157,653		64,995
Proceeds from maturities and sale of marketable securities						124,210		157,653
Net cash provided by investing activities		12,565		13,673		38,048		12,565
Cash flows from financing activities
Proceeds from issuance of common stock upon exercise of stock awards		1,471		667		5,339		1,471
Net cash provided by financing activities		1,471		667		5,339		1,471
Net increase in cash and cash equivalents		23,496		(4,388)		13,421		23,496
Cash and cash equivalents, beginning of period		50,312		26,246		163,544		50,312
Cash and cash equivalents, end of period	$	73,808	$	21,858	$	176,965	$	73,808

Supplemental disclosure of cash flow information
Cash paid during the period for:
Interest	$	6	$	4	$	4	$	6
Supplemental disclosures of non-cash investing activities
Unrealized gain (loss) on marketable securities, net of tax	$	(105)	$	1,316
Unrealized gain (loss) on marketable securities					$	23	$	(105)

See accompanying notes.

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Xencor, Inc.

Notes to Financial Statements

(unaudited)

March 31, ~~2020~~2021

1. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying unaudited interim financial statements for Xencor, Inc. (the Company, Xencor, we or us) have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information. The financial statements include all adjustments (consisting only of normal recurring adjustments) that the management of the Company believes are necessary for a fair presentation of the periods presented. The preparation of interim financial statements requires the use of management’s estimates and assumptions that affect reported amounts of assets and liabilities at the date of the interim financial statements and the reported revenues and expenditures during the reported periods. These interim financial results are not necessarily indicative of the results expected for the full fiscal year or for any subsequent interim period.

The accompanying unaudited interim financial statements and related notes should be read in conjunction with the audited financial statements and notes thereto included in the Company’s ~~2019~~2020 Annual Report on Form 10-K filed with the Securities and Exchange Commission (SEC) on February 24, ~~2020.~~2021.

Use of Estimates

The preparation of interim financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, other comprehensive gain (loss) and the related disclosures. On an ongoing basis, management evaluates its estimates, including estimates related to its accrued clinical trial and manufacturing development expenses, stock-based compensation expense, intangible assets and related amortization. Significant estimates in these interim financial statements include ~~estimates~~estimates: made for ~~royalties and~~royalty revenue, accrued research and development expenses, stock-based compensation expenses, intangible assets and related amortization, estimated standalone selling price of performance obligations, estimated time for completing delivery of performance obligations under certain arrangements, the likelihood of recognizing variable consideration, and recoverability of deferred tax assets.

Intangible Assets

The Company maintains definite-lived intangible assets related to certain capitalized costs of acquired licenses and third-party costs incurred in establishing and maintaining its intellectual property rights to its platform technologies and development candidates. These assets are amortized over their useful lives, which are estimated to be the remaining patent life or the contractual term of the license. The straight-line method is used to record amortization expense. The Company assesses its intangible assets for impairment if indicators are present or changes in circumstances suggest that impairment may exist. There were 0 impairment charges recorded for the three months ended March 31, ~~2020~~2021 and ~~2019.~~2020.

The Company capitalizes certain in-process intangible assets that are then abandoned when they are no longer pursued or used in current research activities. There was no material abandonment of in-process intangible assets during the three months ended March 31, ~~2020 or 2019.~~2021 and 2020.

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Marketable and Equity Securities

The Company has an investment policy that includes guidelines on acceptable investment securities, minimum credit quality, maturity parameters, and concentration and diversification. The Company invests its excess cash primarily in marketable debt securities issued by investment grade institutions.

~~Table of Contents~~

The Company considers its marketable debt securities to be available-for-sale and does not intend to sell these securities, and it is not more likely than not that the Company will be required to sell the securities before recovery of the amortized cost basis. These assets are carried at fair value and any impairment ~~gains (losses)~~losses and recoveries related to the underlying issuer’s credit standing are recognized within other income (expense), while non-credit related impairment ~~gains (losses)~~losses and recoveries are recognized within accumulated other comprehensive income (loss). There were 0 impairment losses or recoveries recorded for the three months ended March 31, 2021 and 2020, respectively. Accrued interest on marketable debt securities is included in marketable securities’ carrying value. Each reporting period, the Company reviews its portfolio of marketable debt securities, using both quantitative and qualitative factors, to determine if each security’s fair value has declined below its amortized cost basis.

The Company ~~also has~~receives equity securities in connection with certain licensing transactions with its partners. These investments in an equity ~~securities that~~security are carried at fair value with changes in fair value recognized each period and reported within other income (expense). For equity securities with a readily determinable fair value, the Company remeasures these equity investments at each reporting period until such time that the investment is sold or disposed. If the Company sells an investment, any realized gains ~~and~~or losses on the sale of the securities will be recognized within other income (expense) in the ~~Statement~~Statements of Comprehensive Income (Loss) in the period of sale.

The Company also has investments in equity securities without readily determinable fair values, where the Company elects the measurement alternative to record at its initial cost minus impairment, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer.

Recent Accounting Pronouncements

Pronouncements Adopted in ~~2020~~2021

Effective January 1, ~~2020,~~2021, the Company adopted ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, as well as ASU No, 2018-19, Codification Improvements to Topic 326, Financial Instruments – Credit Losses. The standard amends guidance on reporting credit losses for assets held at amortized cost basis and also provides an available-for-sale (AFS) debt security impairment model that is a modified version of the other-than-temporary-impairment (OTTI) model. The AFS debt security impairment model no longer allows consideration of the length of time during which the fair value has been less than its amortized cost when determining whether a credit loss exists. The adoption of this standard did not have any impact on the Company’s financial statements.

Effective January 1, 2020, the Company adopted ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement, which modifies the disclosures for transfers between Level 1 and Level 2 of the fair value hierarchy, modifies the Level 3 disclosure requirements for non-public entities and requires additional disclosure for Level 3 fair value hierarchy. The adoption of this standard did not have any impact on the Company’s financial statements.

Effective January 1, 2020, the Company adopted ASU No. 2018-18, Collaborative Arrangements (Topic 808): Clarifying the Interaction Between Topic 808 and Topic 606, which provides guidance on how to assess whether certain transactions between collaborative arrangement participants should be accounted for within the revenue recognition standard. The adoption of this standard did not have any impact on the Company’s financial statements.

2019-12,~~Pronouncements Not Yet Effective~~

~~In December 2019, the Financial Accounting Standards Board (FASB) issued ASU No. 2019-12,~~ Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which ~~is effective for fiscal years beginning and after December 15, 2020, and interim periods within those fiscal years. The standard~~ removes specific exceptions to the general principles in Topic 740 and simplifies the accounting for income taxes. The ~~Company does~~adoption of this standard did not ~~anticipate that the standard will~~ have a significant impact on ~~its~~the Company’s financial statements.

~~Table of Contents~~

InEffective January ~~2020,~~1, 2021, the ~~FASB issued~~Company adopted ASU No. 2020-01, which clarifies that a company should consider observable transactions that require a company to either apply or discontinue the equity method of accounting under Topic 323, Investment – Equity Method and Joint Ventures, for the purposes of applying the measurement alternative in accordance with Topic 321, Investments – Equity Securities immediately before applying or upon discontinuing the equity method. The ~~amendment is effective for fiscal years beginning after December 15, 2020. The Company does~~adoption of this standard did not ~~anticipate that the standard will~~ have a significant impact on ~~its~~the Company’s financial statements.

Effective January 1, 2021, the Company adopted ASU No. 2020-10, Codification Improvements, which amends a variety of topics in the Accounting Standards Codification to improve consistency and clarify guidance. The adoption of this standard did not have a significant impact on the Company’s financial statements.

There have been no other material changes to the significant accounting policies previously disclosed in the Company’s ~~2019~~2020 Annual Report on Form 10-K.

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2. Fair Value of Financial Instruments

Financial instruments included in the financial statements include cash and cash equivalents, marketable debt securities, accounts receivable, accounts payable and accrued expenses. Marketable debt securities and cash equivalents are carried at fair value. The fair value of the other financial instruments closely approximates their fair value due to their short-term maturities.

The Company accounts for recurring and non-recurring fair value measurements in accordance with FASB Accounting Standards Codification ~~ASC~~(ASC) 820, Fair Value Measurements and Disclosures (ASC 820). ASC 820 defines fair value, establishes a fair value hierarchy for assets and liabilities measured at fair value, and requires expanded disclosure about fair value measurements. The ASC 820 hierarchy ranks the quality of reliable inputs, or assumptions, used in the determination of fair value and requires assets and liabilities carried at fair value to be classified and disclosed in one of the following three categories:

Level 1—Fair ~~Value~~value is determined by using unadjusted quoted prices that are available in active markets for identical assets or liabilities.

Level 2—Fair ~~Value~~value is determined by using inputs other than Level 1 quoted prices that are directly or indirectly observable. Inputs can include quoted prices for similar assets or liabilities in active markets or quoted prices for identical assets or liabilities in markets that are not active. Related inputs can also include those used in valuation or other pricing models, such as interest rates and yield curves that can be corroborated by observable market data.

Level 3—Fair value is determined by inputs that are unobservable and not corroborated by market data. Use of these inputs involves significant and subjective judgments to be made by the reporting entity – e.g. determining an appropriate discount factor for illiquidity associated with a given security.

The Company measures the fair value of financial assets using the highest level of inputs that are reasonably available as of the measurement date. The assets recorded at fair value are classified within the hierarchy as follows for the periods reported (in thousands):


													March 31, 2021
	March 31, 2020						December 31, 2019						(unaudited)								December 31, 2020
	Total						Total						Total								Total
	Fair Value		Level 1		Level 2		Fair Value		Level 1		Level 2		Fair Value		Level 1		Level 2		Level 3		Fair Value		Level 1		Level 2		Level 3

Money Market Funds	$	49,800	$	49,800	$	—	$	32,009	$	32,009	$	—	$	165,350	$	165,350	$	—	$	—	$	158,937	$	158,937	$	—	$	—
Corporate Securities		332,691		—		332,691		281,751		—		281,751		73,929		—		73,929		—		119,833		—		119,833		—
Government Securities		203,382		—		203,382		269,245		—		269,245		320,031		—		320,031		—		315,353		—		315,353		—
Equity Securities with Readily Determinable Fair Value		2,253		2,253		—		—		—		—		6,136		6,136		—		—		5,303		5,303		—		—
Equity Securities without Readily Determinable Fair Value														28,219		—		—		28,219		16,071		—		—		16,071
	$	588,126	$	52,053	$	536,073	$	583,005	$	32,009	$	550,996	$	593,665	$	171,486	$	393,960	$	28,219	$	615,497	$	164,240	$	435,186	$	16,071

Our policy is to record transfers of assets between Level 1 and Level 2 at their fair values as of the end of each reporting period, consistent with the date of the determination of fair value. During the three months ended March 31, ~~2020~~2021 and ~~2019,~~2020, there were 0 transfers between Level 1 and Level 2. ~~The Company does not have any~~During the three months ended March 31, 2021, an equity investment without a readily determinable fair value was transferred to Level ~~3 assets or liabilities.~~1 from Level 3.

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The Company held equity securities without readily determinable fair value at March 31, 2021 and December 31, 2020, respectively. The Company elects the measurement alternative to record at its initial cost minus impairment, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer.

3. Net ~~Income (Loss)~~Loss Per Share

~~We compute basic~~Basic net ~~income (loss)~~loss per common share is computed by dividing the net ~~income (loss)~~loss attributable to common stockholders by the weighted-average number of common shares outstanding during the period without consideration of common stock equivalents. Diluted net ~~income (loss)~~loss per share is computed by dividing the net ~~income (loss)~~loss attributable to common stockholders by the weighted-average number of common stock equivalents outstanding for the period. ~~The treasury stock method is used to determine the dilutive effect of the Company’s stock option grants, employee stock purchase plan (ESPP) and restricted stock units (RSUs).~~ Potentially dilutive securities consisting of stock issuable under options, ESPP and RSUs and are not included in the per common share calculation in periods when the inclusion of such shares would have an ~~antidilutive~~anti-dilutive effect.

Basic and diluted net ~~income (loss)~~loss per common share is computed as ~~follows (in thousands except share and per share data):~~follows:


	Three Months Ended				Three Months Ended
	March 31,				March 31,
	2020		2019		2021		2020

	(in thousands, except share and per share data)				(in thousands, except share and per share data)
Numerator:
Net income (loss) attributable to common stockholders	$	(8,074)	$	80,045
Net loss attributable to common stockholders					$	(2,487)	$	(8,074)
Denominator:
Weighted-average common shares outstanding used in computing basic net income (loss)		56,946,714		56,302,967
Effect of dilutive securities		—		1,706,911
Weighted-average common shares outstanding used in computing diluted net income (loss)		56,946,714		58,009,878
Basic net income (loss) per common share	$	(0.14)	$	1.42
Diluted net income (loss) per common share	$	(0.14)	$	1.38
Weighted-average common shares outstanding used in computing basic and diluted net loss						57,997,313		56,946,714
Basic and diluted net loss per common share					$	(0.04)	$	(0.14)

For the three months ended March 31, 2021 and 2020, all outstanding potentially dilutive securities have been excluded from the calculation of diluted net loss per common share as the effect of including such securities would have been antidilutive. For the three months ended March 31, 2019, potentially dilutive securities consisting of 964,743 shares of stock awards are excluded from the calculation for the same period because the inclusion of such shares would have had an antidilutive effect.anti-dilutive.

4. Comprehensive ~~Income (Loss)~~Loss

Comprehensive ~~income (loss)~~loss is comprised of net ~~income (loss)~~loss and other comprehensive income (loss). For the three months ended March 31, ~~2020~~2021 and ~~2019,~~2020, the only component of other comprehensive income (loss) is net unrealized gain (loss) on marketable securities. There were no material reclassifications out of accumulated other comprehensive income (loss) during the three months ended March 31, ~~2020~~2021 and ~~2019.~~2020.

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5. Marketable and Equity Securities

The Company’s marketable debt securities held as of March 31, ~~2020~~2021 and December 31, ~~2019~~2020 are summarized below:


			Gross		Gross						Gross		Gross
	Amortized		Unrealized		Unrealized				Amortized		Unrealized		Unrealized
March 31, 2020	Cost		Gains		Losses		Fair Value
March 31, 2021									Cost		Gains		Losses		Fair Value
(in thousands)
Money Market Funds	$	49,800	$	—	$	—	$	49,800	$	165,350	$	—	$	—	$	165,350
Corporate Securities		333,259		22		(590)		332,691		73,922		12		(5)		73,929
Government Securities		201,748		1,634		—		203,382		319,931		107		(7)		320,031
	$	584,807	$	1,656	$	(590)	$	585,873	$	559,203	$	119	$	(12)	$	559,310

Reported as
Cash and cash equivalents							$	49,800							$	165,350
Marketable securities								536,073								393,960
Total investments							$	585,873							$	559,310



			Gross		Gross						Gross		Gross
	Amortized		Unrealized		Unrealized				Amortized		Unrealized		Unrealized
December 31, 2019	Cost		Gains		Losses		Fair Value
December 31, 2020									Cost		Gains		Losses		Fair Value
(in thousands)
Money Market Funds	$	32,009	$	—	$	—	$	32,009	$	158,937	$	—	$	—	$	158,937
Corporate Securities		281,586		195		(30)		281,751		119,782		57		(6)		119,833
Government Securities		268,239		1,006		—		269,245		315,319		37		(3)		315,353
	$	581,834	$	1,201	$	(30)	$	583,005	$	594,038	$	94	$	(9)	$	594,123

Reported as
Cash and cash equivalents							$	32,009							$	158,937
Marketable securities								550,996								435,186
Total investments							$	583,005							$	594,123

The maturities of the Company’s marketable debt securities are as follows:


	Amortized		Estimated		Amortized		Estimated
March 31, 2020	Cost		Fair Value
March 31, 2021					Cost		Fair Value
(in thousands)
Mature in one year or less	$	496,586	$	497,841	$	368,762	$	368,878
Mature within two years		38,421		38,232		25,091		25,082
	$	535,007	$	536,073	$	393,853	$	393,960

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The unrealized losses on available-for-sale investments and their related fair values as of March 31, ~~2020~~2021 and December 31, ~~2019~~2020 are as follows:


	Less than 12 months				12 months or greater				Less than 12 months				12 months or greater
			Unrealized				Unrealized				Unrealized				Unrealized
March 31, 2020	Fair value		losses		Fair value		losses
March 31, 2021									Fair value		losses		Fair value		losses
(in thousands)
Corporate Securities	$	141,723	$	(401)	$	38,232	$	(189)	$	4,102	$	(2)	$	3,066	$	(3)
Government Securities										—		—		14,990		(7)
									$	4,102	$	(2)	$	18,056	$	(10)


	Less than 12 months				12 months or greater
			Unrealized				Unrealized		Less than 12 months				12 months or greater
December 31, 2019	Fair value		losses		Fair value		losses
											Unrealized				Unrealized
December 31, 2020									Fair value		losses		Fair value		losses
(in thousands)
Corporate Securities	$	46,303	$	(24)	$	13,992	$	(6)	$	15,843	$	(6)	$	—	$	—
Government Securities										40,802		(3)		—		—
									$	56,645	$	(9)	$	—	$	—

The unrealized losses from the listed securities are primarily due to a change in the interest rate environment and not a change in the credit quality of the securities.

In ~~connection with the Aimmune Agreement (as defined below) executed in February~~ 2020, the Company received shares of common stock of Aimmune Therapeutics, Inc. (Aimmune) and shares of common stock of Viridian Therapeutics, Inc. (Viridian, formerly MiRagen Therapeutics, Inc.) in connection with the Aimmune and Viridian licensing arrangements (both as defined below). The Aimmune common stock ~~which are~~was redeemed for cash within the same year; the Viridian common stock is classified as equity securities with a readily determinable fair value ~~as of~~at March 31, ~~2020.~~2021. In 2020, the Company also received equity of Zenas BioPharma Limited (Zenas), a private company, in connection with a licensing agreement. The Company elected the measurement alternative to carry the Zenas equity at cost minus impairment, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. There has not been any impairment or observable price changes related to this investment. In 2018, the Company received equity shares in Quellis Biosciences, Inc. (Quellis), a private company, in connection with a licensing transaction. The Company recorded ~~$2.3 million~~the Quellis equity as securities not having a readily determinable fair value, and the investment was recorded at its original cost. In 2021, Quellis merged into Catabasis Pharmaceuticals, Inc. (Catabasis), and the Company received equity shares in Catabasis, which common shares have a readily determinable fair value. The adjustment in the fair value of ~~unrealized losses related to these securities~~the Catabasis equity has been recorded in other income ~~(expense) during~~(loss) for the three months ended March 31, ~~2020. We did not hold any equity securities in our investment portfolio at December 31, 2019.~~2021.

Net gains and losses during the year ended March 31, 2021 and 2020 consist of the following:


	Three Months Ended
	March 31,
	2021		2020
Net gains (losses) recognized on equity securities	$	12,981	$	(2,336)
Less: net gains recognized on equity securities redeemed		(1)		—
Unrealized gains (losses) recognized on equity securities	$	12,980	$	(2,336)

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6. Stock Based Compensation

Our Board of Directors (the Board) and the requisite stockholders previously approved the 2010 Equity Incentive Plan (the 2010 Plan). In October 2013, the Board approved the 2013 Equity Incentive Plan (the 2013 Plan), and in November 2013, our stockholders approved the 2013 Plan, which became effective as of December 3, 2013. As of December 2, 2013, we suspended the 2010 Plan, and 0 additional awards may be granted under the 2010 Plan. Any shares of common stock covered by awards granted under the 2010 Plan that terminate after December 2, 2013 by expiration, forfeiture, cancellation or other means without the issuance of such shares will be added to the 2013 Plan reserve.

As of March 31, ~~2020,~~2021, the total number of shares of common stock available for issuance under the 2013 Plan is ~~12,300,969,~~13,445,524, which includes 2,684,456 shares of common stock that were available for issuance under the 2010 Plan as of the effective date of the 2013 Plan. Unless otherwise determined by the Board, beginning January 1, 2014, and continuing until the expiration of the 2013 Plan, the total number of shares of common stock available for issuance under the 2013 Plan will automatically increase annually on January 1 of each year by 4% of the total number of issued and outstanding shares of common stock as of December 31 of the ~~immediate~~immediately preceding year. Pursuant to approval by the Board, ~~on January 1, 2020,~~ the total number of shares of common stock available for issuance under the 2013 Plan was increased by ~~1,138,046 shares.~~2,314,937 shares on January 1, 2021. As of March 31, ~~2020,~~2021, a total of ~~10,030,935~~11,894,756 options have been granted under the 2013 Plan.

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In November 2013, the Board and our stockholders approved the 2013 Employee Stock Purchase Plan (ESPP), which became effective as of December 5, 2013. We have reserved a total of 581,286 shares of common stock for issuance under the ESPP. Unless otherwise determined by the Board, beginning on January 1, 2014, and continuing until the expiration of the ESPP, the total number of shares of common stock available for issuance under the ESPP will automatically increase annually on January 1 by the lesser of (i) 1% of the total number of issued and outstanding shares of common stock as of December 31 of the immediately preceding year, or (ii) 621,814 shares of common stock. Pursuant to approval by our Board of Directors, there was 0 increase in the number of authorized shares in the ESPP from 2015 to 2020. As of March 31, ~~2020,~~2021, we have issued a total of ~~417,277~~467,595 shares of common stock under the ESPP.

During the three months ended March 31, ~~2020,~~2021, the Company awarded ~~221,604 RSUs~~247,050 restricted stock units (RSUs) to certain employees. ~~Vesting~~The standard vesting of these awards is generally in 3 equal annual installments and is contingent on continued service to the Company. The fair value of these awards is determined based on the intrinsic value of the stock on the date of grant and will be recognized as stock-based compensation expense over the requisite service period. As of March 31, ~~2020,~~2021, we have granted a total of ~~327,103~~700,837 shares of common stock ~~subject to~~issuable upon the vesting of RSUs.

Total employee, director and non-employee stock-based compensation expense recognized for the three months ended March 31, ~~2020~~2021 and ~~2019~~2020 are as follows (in thousands):


	Three Months Ended				Three Months Ended
	March 31,				March 31,
	2020		2019		2021		2020
General and administrative	$	2,291	$	1,854	$	2,737	$	2,291
Research and development		4,221		4,002		5,556		4,221
	$	6,512	$	5,856	$	8,293	$	6,512

	Three Months Ended				Three Months Ended
	March 31,				March 31,
	2020		2019		2021		2020
Stock options	$	5,882	$	5,525	$	6,530	$	5,882
ESPP		194		217		248		194
Restricted stock units		436		114
RSUs						1,515		436
	$	6,512	$	5,856	$	8,293	$	6,512

~~The following table summarizes option activity under our stock plans and related information:~~

Weighted

Weighted

Average

Average

Number of

Exercise

Remaining

Aggregate

Shares subject

Price

Contractual

Intrinsic

to outstanding

(Per

Term

Value

options

Share)

(in years)

(in thousands)
Balances at December 31, 2019

7,174,319

$
24.03

7.32

Options granted

1,137,420

$
32.36

Options forfeited

(69,654)

$
30.71

Options exercised

(79,930)

$
18.40

Balances at March 31, 2020

8,162,155

$
25.19

7.38

$
55,326
Exercisable

4,429,727

$
19.50

6.07

$
49,866

~~We calculate the intrinsic value as the difference between the exercise price of the options and the closing price of common stock of $29.88 per share as of March 31, 2020.~~

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The following table summarizes option activity under our stock plans and related information:


		Weighted		Weighted
		Average		Average
	Number of	Exercise		Remaining		Aggregate
	Shares Subject	Price		Contractual		Intrinsic
	to Outstanding	(Per		Term		Value
	Options	Share)		(in years)		(in thousands)
Balance at December 31, 2020	7,751,789	$	26.23		7.00	$	134,941
Options granted	1,321,917	$	43.24
Options forfeited	(64,824)	$	33.00
Options exercised	(230,701)	$	23.14
Balance at March 31, 2021	8,778,181	$	28.82		7.25	$	125,395
Exercisable	4,963,607	$	22.73		5.95	$	100,938

~~Weighted average~~We calculate the intrinsic value as the difference between the exercise price of the options and the closing price of common stock of $43.06 per share as of March 31, 2021.

Weighted-average fair value of options granted during the three-month periods ended March 31, 2021 and 2020 were $22.83 and ~~2019 were~~ $16.64 ~~and $21.20~~ per share, respectively. There were ~~1,342,447~~1,137,420 options granted during the three-month period ended March 31, ~~2019.~~2020. We estimated the fair value of each stock option using the Black-Scholes option-pricing model based on the date of grant of such stock option with the following weighted average assumptions for the three months ended March 31, ~~2020~~2021 and ~~2019:~~2020:


	Options				Options
	Three Months Ended				Three Months Ended
	March 31,				March 31,
	2020		2019		2021		2020
Expected term (years)	6.3		6.1		6.2		6.3
Expected volatility	53.9	%	61.3	%	55.6	%	53.9	%
Risk-free interest rate	1.71	%	2.53	%	1.02	%	1.71	%
Expected dividend yield	—	%	—	%	—	%	—	%


	ESPP				ESPP
	Three Months Ended				Three Months Ended
	March 31,				March 31,
	2020		2019		2021		2020
Expected term (years)	0.5 - 2.0		0.5 - 2.0		0.5 - 2.0		0.5 - 2.0
Expected volatility	50.8	%	57.0 - 71.4	%	50.8 - 66.4	%	50.8	%
Risk-free interest rate	1.56 - 1.65	%	1.47 - 2.70	%	0.09 - 1.65	%	1.56 - 1.65	%
Expected dividend yield	—	%	—	%	—	%	—	%

As of March 31, ~~2020,~~2021, the unamortized compensation expense related to unvested stock options was ~~$62.2~~$71.4 million. The remaining unamortized compensation expense will be recognized over the next ~~2.9~~3.0 years. As of March 31, ~~2020,~~2021, the unamortized compensation expense under our ESPP was ~~$1.3~~$0.7 million. The remaining unamortized expense will be recognized over the next ~~1.7~~0.7 years.

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The following table summarizes the RSU activity for the three-month period ended March 31, ~~2020:~~2021:


		Weighted			Weighted
	Restricted	Average Grant		Restricted	Average Grant
	Stock	Date Fair Value		Stock	Date Fair Value
	Units	(Per unit)		Units	(Per unit)

Unvested at December 31, 2019	90,006	$	34.66
Unvested RSUs at December 31, 2020				358,825	$	33.04
Granted	221,604		31.87	247,050		43.11
Vested	(19,022)		31.72	(117,808)		31.75
Forfeited	(3,404)		31.21	(9,071)		32.36
Unvested at March 31, 2020	289,184	$	32.76
Unvested RSUs at March 31, 2021				478,996	$	38.56

As of March 31, ~~2020,~~2021, the unamortized compensation expense related to unvested RSUs was ~~$9.0~~$17.3 million. The remaining unamortized expense will be recognized over the next ~~2.8~~2.6 years.

7. Leases

The Company leases office and laboratory space in Monrovia, CA under a lease that ~~continues through June 2020,~~expires in December 2025 with an option to renew for an additional five ~~years.~~years at then market rates. In ~~April 2020,~~July 2017, under a separate lease agreement, the Company entered into ~~an amendment to the~~a lease ~~to extend the term of the lease under the original terms through September 2020.~~In~~July 2017, the Company entered into an amended lease agreement~~ for additional space in the same building with a lease that continues through September 2022, also with an option to renew for an additional five years. The Company assesses that it is likely to exercise both options of the lease term extensions.

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The Company also leases office space in San Diego, CA through July 2020 which includes an option to renew for an additional five years. The Company assesses that it is unlikely to exercise the option to extend this lease.

The Company leases additional office space in San Diego, CA through August 2022, with an option to extend for an additional five years. The Company assesses that it is unlikely to exercise the option to extend the lease term.

The Company’s lease agreements do not contain any residual value guarantees or restrictive covenants. As of March 31, ~~2020,~~2021, the Company did not have additional operating leases that have not yet commenced.

The following table reconciles the undiscounted cash flows for the operating leases at March 31, ~~2020~~2021 to the operating lease liabilities recorded on the balance sheet (in thousands):


Years ending December 31,
For the remainder of 2020	$	2,001
2021		2,587
For the remainder of 2021			$	1,773
2022		2,208		2,269
2023		1,352		1,415
2024		1,371		1,436
2025		1,044		1,396
2026				1,480
Thereafter		1,238		3,861
Total undiscounted lease payments		11,801		13,630
Less: Imputed interest		(1,624)		(2,502)
Present value of lease payments	$	10,177	$	11,128

Lease liabilities - short-term	$	2,136	$	1,934
Lease liabilities - long-term		8,041		9,194
Total lease liabilities	$	10,177	$	11,128

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~~Our operating~~The following table summarizes lease costs and ~~payments were $0.7 million~~cash disclosures for ~~each of~~ the three months ended March 31, 2021 and 2020 ~~and 2019. At~~(in thousands):


	Three Months Ended
	March 31,
	2021		2020

Operating lease cost	$	614	$	648
Variable lease cost		10		22
Total lease costs	$	624	$	670

Cash paid for amounts included in
the measurement of lease liabilities	$	499	$	557

As of March 31, ~~2020,~~2021, the weighted-average remaining lease term for operating leases ~~was 5.3~~is 7.3 years, and the ~~weighted average~~weighted-average discount rate for operating leases is 5.5%.

8. Commitments and Contingencies

From time to time, the Company may be subject to various litigation and related matters arising in the ordinary course of business. The Company does not believe it is currently subject to any material matters where there is at least a reasonable possibility that a material loss may be incurred.

The Company is obligated to make future payments to third parties under in-license agreements, including sublicense fees, royalties, and payments that become due and payable on the achievement of certain development and commercialization milestones. As the amount and timing of sublicense fees and the achievement and timing of these milestones are not probable and estimable, such commitments have not been included on the Company’s balance sheet. The Company has also entered into agreements with third-party vendors which will require us to make future payments upon the delivery of goods and services in future periods.

9. Collaboration and Licensing Agreements

The following is a summary description of the material revenue arrangements, including arrangements that generated revenue in the three months ended March 31, ~~2020~~2021 and ~~2019.~~2020.

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~~Genentech~~

In February 2019, the Company entered into a collaboration and license agreement (the Genentech Agreement) with Genentech, Inc. and F. Hoffman-La Roche Ltd (collectively, Genentech) for the development and commercialization of novel IL-15 collaboration products (Collaboration Products), including XmAb24306 (also named RG6323), the Company’s IL-15/IL-15Ra candidate. The Genentech Agreement became effective March 8, 2019.

Under the terms of the Genentech Agreement, Genentech received an exclusive worldwide license to XmAb24306 and other Collaboration Products, including any new IL-15 programs identified during the joint research collaboration. Genentech and Xencor will jointly collaborate on worldwide development of XmAb24306 and potentially other Collaboration Products with Genentech maintaining all worldwide commercialization rights, subject to Xencor having an option to co-promote in the United States. Xencor has the right to perform clinical studies of Collaboration Products in combination with other therapeutic agents at its own cost, subject to certain requirements.

The Company received a $120.0 million upfront payment and is eligible to receive up to an aggregate of $160.0 million in clinical milestone payments for each Collaboration Product that advances to Phase 3 clinical trials. The Company is also eligible to receive 45% share of net profits for sales of XmAb24306 and other Collaboration Products, while also sharing in net losses at the same percentage rate. The parties will jointly share in development and commercialization costs for all programs designated as a development program under the Genentech Agreement at the same percentage rate, while Genentech will bear launch costs entirely. The initial 45% profit-cost share percent is subject to ratchet down at the Company’s discretion and convertible to a royalty under certain restrictions.

Pursuant to the Genentech Agreement, XmAb24306 is designated as a development program and all costs incurred for developing XmAb24306 from March 8, 2019, the effective date of the Genentech Agreement, are being shared with Genentech under the initial cost-sharing percentage.

Pursuant to the Genentech Agreement, the Company and Genentech will conduct joint research activities for a two-year period to identify and discover additional IL-15 candidates developed from the Company’s cytokine and bispecific technologies. The two-year research term may be extended an additional year if both parties agree. The Company and Genentech are each responsible for their own costs in conducting the research activities. The Company is eligible for clinical milestone payments for new Collaboration Products identified from the research efforts.

The Company recognized the $111.7 million allocated to the license when it satisfied its performance obligation and transferred the license to Genentech in March 2019. A total of $8.3 million of the transaction price was allocated to the research activities and is being recognized over a period of time through the end of the research term that services are rendered. A total of $0.7 ~~million of revenue related to the research activities was recognized in the three-month period ended March 31, 2020.~~

For the three months ended March 31, 2020 and March 31, 2019, the Company recognized $0.7 million and $112.0 million of income, respectively, from the Genentech Agreement. As of March 31, 2020, there is a $1.4 million payable related to cost-sharing development activities during the first quarter of 2020 for the XmAb24306 program. There is $5.4 million in deferred revenue as of March 31, 2020 which reflects the obligation to perform research services during the remaining research term.

~~Astellas~~

Effective March 29, 2019, the Company entered into a Research and License Agreement (Astellas Agreement) with Astellas Pharma Inc. (Astellas) pursuant to which the Company and Astellas will conduct a discovery program to characterize compounds and products for development and commercialization. Under the Astellas Agreement, Astellas was granted a worldwide exclusive license, with the right to sublicense products in the field created by the research activities.

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Pursuant to the Astellas Agreement, the Company will apply its bispecific Fc technology to research antibodies provided by Astellas to generate bispecific antibody candidates and will conduct limited testing and characterization of the bispecific candidates and return the candidates to Astellas for development and commercialization. The activities will be conducted under a research plan agreed to by both parties to the Astellas Agreement. Astellas will assume full responsibility for development and commercialization of the antibody candidate. Pursuant to the Astellas Agreement, the Company received an upfront payment of $15.0 million and is eligible to receive up to $240.0 million in milestones which include $32.5 million in development milestones, $57.5 million in regulatory milestones and $150.0 ~~million in sales milestones. If commercialized, the Company is eligible to receive royalties on net sales that range from the high-single to low-double digit percentages.~~

The Company recognized the $13.6 million allocated to the bispecific antibodies when it satisfied its performance obligation and transferred the bispecific antibodies to Astellas in June 2019. The $1.4 million allocated to the research activities is being recognized as the research services are being completed over the period of time the Company expects to complete the activities under the research plan.

~~For the three months ended March 31, 2020, the Company recognized $0.3 million revenue related to the arrangement, and 0~~ ~~revenue was recognized under this arrangement for the three months ended March 31, 2019. There is~~ ~~$0.7~~ ~~million in deferred revenue as of March 31, 2020 related to the obligation to complete research activities under the Astellas Agreement.~~

~~Novartis~~

In June 2016, the Company entered into a Collaboration and License Agreement (Novartis Agreement) with Novartis Institutes for BioMedical Research, Inc. (Novartis), to develop and commercialize bispecific and other Fc engineered antibody drug candidates using the Company’s proprietary XmAb technologies and drug candidates. The Company received an upfront payment of $150.0 million and is eligible to receive additional development, regulatory and sales milestones.

~~Pursuant to the Novartis Agreement:~~

●

The Company granted Novartis certain exclusive rights to research, develop and commercialize vibecotamab (XmAb14045) and plamotamab (XmAb13676), 2 development stage products that incorporate the Company’s bispecific Fc technology;

●

~~The Company will apply its bispecific technology in up to 4 target pair antibodies identified by Novartis (each a Global Discovery Program); and~~

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~~The Company will provide Novartis with a non-exclusive license to certain of its Fc technologies to apply against up to 10 targets identified by Novartis.~~

~~Under the Novartis Agreement, the Company and Novartis are co-developing vibecotamab worldwide and sharing development costs.~~

~~In December 2018, Novartis notified the Company it was terminating its rights with respect to the plamotamab, which became effective June 2019.~~

NaN revenue was recognized during the three months ended March 31, 2020 or 2019. As of March 31, 2020, there is a receivable of $0.6 million related to cost-sharing of development activities for the first quarter of 2020 for the vibecotamab program, and $40.1 million in deferred revenue related to the obligation to deliver 2 additional Global Discovery Programs to Novartis under the arrangement.

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~~Amgen Inc.~~

In September 2015, the Company entered into a research and license agreement (the Amgen Agreement) with Amgen Inc. (Amgen) to develop and commercialize bispecific antibody product candidates using the Company’s proprietary XmAb bispecific Fc technology. Under the Amgen Agreement, the Company granted an exclusive license to Amgen to develop and commercialize bispecific drug candidates from the Company’s preclinical program that bind the CD38 antigen and the cytotoxic T cell binding domain CD3 (the CD38 program). The Company also agreed to apply its bispecific technology to 5 previously identified Amgen provided targets (each a Discovery Program). The Company has received a total of $60.5 million in upfront payments and milestone payments and is eligible to receive up to $600.0 million in future development, regulatory and sales milestone payments in total for programs in development and is eligible to receive royalties on any global net sales of products.

~~NaN revenue was recognized under the arrangement during the three months ended March 31, 2020 or 2019. As of March 31, 2020, there was 0 deferred revenue related to the arrangement.~~

~~MorphoSys AG~~

In June 2010, the Company entered into a Collaboration and License Agreement with MorphoSys AG (MorphoSys), which was subsequently amended in March 2012. Under the agreement, we granted MorphoSys an exclusive worldwide license to the Company’s patents and know-how to research, develop and commercialize the XmAb5574 product candidate (subsequently renamed MOR208 and tafasitamab) with the right to sublicense under certain conditions. If certain developmental, regulatory and sales milestones are achieved, the Company is eligible to receive future milestone payments and royalties.

In February 2020, the U.S. Food and Drug Administration (FDA) accepted MorphoSys’ Biologics License Application (BLA) for tafasitamab and the Company received a milestone payment of $12.5 million. The Company recognized the payment as revenue in the period that the milestone event occurred.

The Company recognized $12.5 million of milestone revenue for the three months ended March 31, 2020, and 0 revenue was recognized under this arrangement for the three months ended March 31, 2019. As of March 31, 2020, the Company has 0 deferred revenue related to this agreement.

~~Alexion Pharmaceuticals, Inc.~~

In January 2013, the Company entered into an option and license agreement with Alexion Pharmaceuticals, Inc. (Alexion). Under the terms of the agreement, the Company granted to Alexion an exclusive research license, with limited sublicensing rights, to make and use the Company’s Xtend technology to evaluate and advance compounds. Alexion exercised its rights to 1 target program, ALXN1210, which is now marketed as Ultomiris®.

The Company is eligible to receive contractual milestones for certain commercial achievements and is also entitled to receive royalties based on a percentage of net sales of Ultomiris sold by Alexion, its affiliates or its sub licensees, which percentage is in the low single digits. Alexion’s royalty obligations continue on a product-by-product and country-by-country basis until the expiration of the last-to-expire valid claim in a licensed patent covering the applicable product in such country.

~~Under ASC 606, the Company recognizes revenue for sales-based royalties upon the subsequent sale of the product. We began earning royalty revenue from the sale of Ultomiris in 2019.~~

~~The Company recognized $3.3 million of royalty revenue under this arrangement for the three months ended March 31, 2020.~~ No royalty revenue was recognized for the three months ended March 31, 2019. As of March 31, 2020, there is a receivable of $6.0 million related to royalties due under the arrangement. There is 0 deferred revenue related to this agreement.

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~~INmune Bio, Inc.~~

In October 2017, the Company entered into a License Agreement with INmune Bio, Inc. (INmune). Under the terms of the agreement, the Company provided INmune with an exclusive license to certain rights to a proprietary protein, XPRO1595. Under the agreement the Company received an upfront payment of $100,000, a 19% fully diluted equity interest in INmune and an option to acquire additional shares of INmune. The Company is eligible to receive a percentage of sublicensing revenue received for XPRO1595 and also royalties in the mid-single digit percent range on the sale of approved products.

The equity interest in INmune consists of 1,585,000 shares of common stock and the option is to purchase up to an additional 10% of the fully diluted interest in INmune for $10.0 million. We have recorded our equity interest in INmune at cost pursuant to ASC 323. We did not record our share of the net loss from INmune during the three months ended March 31, 2020 or 2019, respectively, as the carrying value of this investment has been reduced to 0.

~~The Company did not recognize any revenue related to the agreement for the three months ended March 31, 2020 and 2019. There is 0 deferred revenue as of March 31, 2020 related to this agreement.~~

~~Vir Biotechnology, Inc.~~

In the third quarter of 2019, the Company entered into a Patent License Agreement (the VirBio Agreement) with Vir Biotechnology (VirBio) pursuant to which the Company provided a non-exclusive license to its Xtend technology for up to 2 targets. Under the terms of the VirBio Agreement, the Company received an upfront payment and is eligible to receive total milestones of $155.25 million which include $5.25 million of development milestones, $30.0 million of regulatory milestones and $120.0 million of sales milestones. In addition, the Company is eligible to receive royalties on the net sales of approved products in the low single digit percent range.

The Company evaluated the VirBio Agreement and determined that the single performance obligation was access to a non-exclusive license to certain patents of the Company which were transferred to VirBio upon execution of the VirBio Agreement in July 2019.

In March 2020, the Company entered into a second Patent License Agreement (the Second VirBio Agreement) with VirBio pursuant to which the Company provided a non-exclusive license to its Xtend technology to extend the half-life of novel antibodies VirBio is investigating as potential treatments for patients with SARS-CoV-2, which causes COVID-19. Under the terms of the Second VirBio Agreement, VirBio is responsible for all research, development, regulatory and commercial activities for the antibody, and the Company is eligible to receive royalties on the net sales of approved products in the mid-single digit percent range.

The Company determined that the Second VirBio Agreement was a modification of the original agreement and the transfer of the license occurred at inception of the VirBio Agreement. The total consideration under the arrangement did not change with the Second VirBio Agreement as the Company will potentially receive additional royalty revenue which is variable consideration and is not included in the transaction price.

~~The Company did not recognize revenue related to the agreement for the three months ended March 31, 2020 or 2019. There is 0 deferred revenue as of March 31, 2020 related to this agreement.~~

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Aimmune Therapeutics, Inc.

On February 4, 2020, the Company entered into a License, Development and Commercialization Agreement (the Aimmune Agreement) with Aimmune ~~Therapeutics, Inc. (Aimmune)~~ pursuant to which the Company granted Aimmune an exclusive worldwide license to XmAb7195, which was renamed AIMab7195. Under the Aimmune Agreement, Aimmune will be responsible for all further development and commercialization activities for XmAb7195. The Company received an upfront payment of $5.0 million and 156,238 shares of Aimmune common stock with an aggregate value of $4.6 million on the closing date. Under the Aimmune Agreement, the Company is also eligible to receive up to $385.0 million in milestones, which include $22.0 million in development milestones, $53.0 million in regulatory milestones and $310.0 million in sales milestones, and tiered royalties on net sales of approved products from high-single to mid-teen ~~percent~~percentage range.

Under the Aimmune Agreement, Aimmune received exclusive worldwide rights to manufacture, develop and commercialize XmAb7195. They also received the rights to all data, information and research materials related to the XmAb7195 program.

~~The Company evaluated the Aimmune Agreement under the revenue recognition standard ASC 606 and identified the following performance obligations that it deemed to be distinct at the inception~~18

Table of ~~the contract:~~Contents

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~~License to the rights to the XmAb7195 drug candidate; and~~

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Rights to material, data and information that the Company had accumulated in connection with manufacturing, testing and conducting clinical trials for the XmAb7195 program and intellectual property filings and information (XmAb7195 data).

The Company considered the licenses as functional intellectual property as Aimmune has the right to use XmAb7195 at the time that the Company transfers such rights. The rights to the XmAb7195 data are not considered to be separate from the license to XmAb7195 as Aimmune cannot benefit from the license without the supporting data and documentation.

The Company determined the transaction price at inception is $9.6 million which consists of the $5.0 million upfront payment and the 156,238 shares of Aimmune common stock which had a value of $4.6 million on the closing date. The Company determined that the transaction price is to be allocated to the performance obligations. The Aimmune Agreement includes variable consideration for potential future milestones and royalties that were contingent on future success factors for the XmAb7195 program. The Company used the “most likely amount” method to determine the variable consideration. None of the development, regulatory or sales milestones or royalties were included in the transaction price. The Company will re-evaluate the transaction price in each reporting period as uncertain events are resolved or other changes in circumstances occur.

The Company determined the transaction price at inception of the Aimmune Agreement and allocated it to the performance obligation, delivery of the XmAb7195 license.

~~The~~ In March 2020, the Company completed delivery of its performance obligations ~~in March 2020. The~~when the license to XmAb7195 was transferred to ~~Aimmune at inception of~~Aimmune.

NaN revenue was recognized in the ~~agreement, and the XmAb7195 data was transferred to Aimmune in~~three months ended March ~~2020.~~

31, 2021. The Company recognized $9.6 million of revenue related to the agreement for the three months ended March 31, 2020. There is 0 deferred revenue as of March 31, 2021 related to this agreement.

Alexion Pharmaceuticals, Inc.

In January 2013, the Company entered into an Option and License Agreement (the Alexion Agreement) with Alexion Pharmaceuticals, Inc. (Alexion). Under the terms of the Alexion Agreement, the Company granted to Alexion an exclusive research license, with limited sublicensing rights, to make and use the Company’s Xtend technology to evaluate and advance compounds. Alexion exercised its rights to 1 target program, ALXN1210, which is now marketed as Ultomiris®.

The Company is eligible to receive contractual milestones for certain commercial achievements and is also entitled to receive royalties based on a percentage of net sales of Ultomiris sold by Alexion, its affiliates or its sublicensees, which percentage is in the low single digits. Alexion’s royalty obligations continue on a product-by-product and country-by-country basis until the expiration of the last-to-expire valid claim in a licensed patent covering the applicable product in such country.

At December 31, 2020, the Company recorded a contract asset of $10.0 million related to a contractual sales milestone; the Company received payment for this milestone during the three-month period ended March 31, 2021.

Under ASC 606, Revenue from Contracts with Customers (ASC 606), the Company recognizes revenue for sales-based royalties upon the subsequent sale of the product. The Company recognized $5.3 million and $3.3 million of royalty revenue under this arrangement for the three months ended March 31, 2021 and 2020, respectively. As of March 31, 2021, there is a receivable of $9.5 million related to royalties due under the arrangement. There is 0 deferred revenue related to this agreement.

Amgen Inc.

In May 2020, Amgen notified the Company that it was terminating its rights with respect to the CD38 x CD3 program, including AMG 424 (now XmAb698). Under the terms of the Amgen Agreement, the rights to the AMG 424 program reverted to the Company in connection with the termination. The Company plans to support studies of XmAb698 in 2021.

NaN revenue was recognized under the arrangement during the three months ended March 31, 2021 or 2020. As of March 31, 2021, there is 0 deferred revenue related to the arrangement.

Astellas Pharma Inc.

Effective March 29, 2019, the Company entered into a Research and License Agreement (the Astellas Agreement) with Astellas Pharma Inc. (Astellas) pursuant to which the Company and Astellas will conduct a discovery program to characterize compounds and products for development and commercialization. Under the Astellas Agreement, Astellas was granted a worldwide exclusive license, with the right to sublicense products in the field created by the research activities.

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Pursuant to the Astellas Agreement, the Company applied its bispecific Fc technology to research antibodies provided by Astellas to generate bispecific antibody candidates and returned the candidates to Astellas for further development and commercialization. Pursuant to the Astellas Agreement, the Company received an upfront payment of $15.0 million and is eligible to receive up to $240.0 million in milestones, which include $32.5 million in development milestones, $57.5 million in regulatory milestones and $150.0 million in sales milestones.

At December 31, 2020, the Company recorded a contract asset of $2.5 million related to a development milestone; the Company received payment for this milestone in the three-month period ended March 31, 2021.

The Company did not recognize revenue related to the arrangement for the three months ended March 31, 2021. The Company recognized $0.3 million revenue for the three months ended March 31, 2020. There is 0 deferred revenue as of March 31, 2021 related to the arrangement.

Atreca, Inc.

In July 2020, the Company entered into a Collaboration and License Agreement (the Atreca Agreement) with Atreca, Inc. (Atreca), to research, develop and commercialize novel CD3 bispecific antibodies as potential therapeutics in oncology. Under the Atreca Agreement, the companies will engage in a three-year research program in which Atreca will provide antibodies against novel tumor targets through its discovery platform from which the Company will engineer XmAb bispecific antibodies that also bind to the CD3 receptor on T cells. The two companies will share research costs equally during the research term. Up to two joint programs are eligible to be mutually selected for further development and commercialization, with each partner sharing 50 percent of costs and profits. Each company has the option to lead development, regulatory and commercialization activities for 1 of the joint programs. In addition, the agreement allows each partner the option to pursue up to 2 programs independently, with a mid-to high-single digit percentage royalty payable on net sales to the other partner.

Catabasis Pharmaceuticals, Inc. / Quellis Biosciences, Inc.

In May 2018, the Company entered into an agreement with Quellis, pursuant to which the Company provided Quellis a non-exclusive license to its Xtend Fc technology to apply to an identified antibody. Quellis is responsible for all development and commercialization activities. The Company received an equity interest in Quellis and is eligible to receive up to $66.0 million in milestones, which include $6.0 million in development milestones, $30.0 million in regulatory milestones and $30.0 million in sales milestones. In addition, the Company is eligible to receive royalties in the mid-single digit percentage range on net sales of approved products.

In January 2021, Quellis merged into Catabasis, and the Company received common and preferred stock of Catabasis stock in exchange for its equity in Quellis. The Company recognized an increase in the fair value of its equity interest for the exchange of shares which is recorded as other income for the three months ended March 31, 2021.

The Company recognized other income of $12.9 million for the three months ended March 31, 2021. There is 0 deferred revenue as of March 31, 2021 related to this agreement.

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Genentech, Inc. and F. Hoffmann-La Roche Ltd.

In February 2019, the Company entered into a collaboration and license agreement (the Genentech Agreement) with Genentech, Inc. and F. Hoffman-La Roche Ltd (collectively, Genentech) for the development and commercialization of novel IL-15 collaboration products (Collaboration Products), including XmAb306 (also named RG6323), the Company’s IL-15/IL-15Ra candidate. The Genentech Agreement became effective March 8, 2019.

Pursuant to the Genentech Agreement, XmAb306 is designated as a development program and all costs incurred for developing XmAb306 from March 8, 2019, the effective date of the Genentech Agreement, are being shared with Genentech under the initial cost-sharing percentage of 45%. In October 2020, a second candidate, a targeted IL-15 candidate, was designated as a development candidate, and all development costs incurred from the date of designation are also being shared with Genentech under the initial cost-sharing percentage of 45%.

Pursuant to the Genentech Agreement, the Company and Genentech are conducting joint research activities for a two-year period to identify and discover additional IL-15 candidates developed from the Company’s cytokine and bispecific technologies. The two-year research term may be extended an additional year if both parties agree. The Company and Genentech are currently in negotiations to extend the research term for an additional year. The Company and Genentech are each responsible for their own costs in conducting the research activities. The Company is eligible for clinical milestone payments for new Collaboration Products identified from the research efforts.

For the three months ended March 31, 2021 and 2020, the Company recognized $0.2 million and $0.7 million of income, respectively, from the Genentech Agreement. As of March 31, 2021, there is a $2.9 million payable related to cost-sharing development activities during the first quarter of 2021 for the XmAb306 and the targeted IL-15 program. There is $2.3 million in deferred revenue as of March 31, 2021, which reflects the Company’s obligation to perform research services.

Gilead Sciences, Inc.

In January 2020, the Company entered into a Technology License Agreement (the Gilead Agreement) with Gilead Sciences, Inc. (Gilead), in which the Company provided an exclusive license to its Cytotoxic Fc and Xtend Fc technologies for an initial identified antibody and options for up to 3 additional antibodies directed to the same molecular target. The Company retains the right to grant licenses for other antibodies directed to the target, subject to the Company’s approval. Gilead is responsible for all development and commercialization activities for all target candidates. The Company received an upfront payment of $6.0 million and is eligible to receive up to $67.0 million in milestones, which include $10.0 million in development milestones, $27.0 million in regulatory milestones and $30.0 million in sales milestones for each product incorporating the antibodies selected. In addition, the Company is eligible to receive royalties in the low-single digit percentage range on net sales of approved products.

~~In March 2020, Gilead exercised options on 2 additional antibody compounds and in April 2020 we received a total of $5.0 million in payment of the 2 options.~~

The Company ~~evaluated the Gilead Agreement under the revenue recognition standard ASC 606 and identified the following performance obligations that it deemed to be distinct at the inception of the contract:~~

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~~Non-exclusive license to its Cytotoxic Fc and Xtend Fc technologies; and,~~

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~~Options for 4 exclusive commercial licenses to incorporate the licensed technologies on approved target compounds~~

The Company considered the licenses as functional intellectual property as Gilead has the right to use the technologies at the time that the Company transfers such rights. Each of the 4 options is considered a separate performance obligation as the arrangement does not confer material rights to the options without payment of the option exercise fee. Gilead will benefit from each option upon exercise of each of the 4 options and payment of each option fee as Gilead has access to each technology at inception of the arrangement and the rights are transferred upon payment of each option fee.

The total transaction price is $11.0 million which includes the upfront payment of $6.0 million and the option fee payment of $5.0 million which is contractually due with the exercise of the 2 options by Gilead. The milestone payments are variable consideration to which the Company applied the “most likely amount” method and concluded at inception of the Agreement it is unlikely that the Company will collect such payments. The milestone payments were not included in the transaction price and the Company will review this conclusion and update at each reporting period.

~~The Company allocated $3.5~~ million of the transaction price to the licenses to the cytotoxic Fc and Xtend Fc technologies and recognized income for the licenses at inception of the arrangement when Gilead began benefiting access to them. The Company allocated $2.5 million to the initial option exercise with the first option exercise effective at inception of the arrangement and payment of the upfront amount and the Company allocated $5.0 million to the other 2 options which will become effective in April 2020 when Gilead paid the option fees.

~~The Company recognized~~ ~~$6.0 million of~~did 0t recognize any revenue related to the ~~agreement~~Gilead Agreement for the three months ended March 31, 2021. The Company recognized $6.0 million revenue for the three months ended March 31, 2020. There is 0 deferred revenue as of March 31, 2021 related to this agreement.

INmune Bio, Inc.

In October 2017, the Company entered into a License Agreement (the INmune Agreement) with INmune Bio, Inc. (INmune). Under the terms of the INmune Agreement, the Company provided INmune with an exclusive license to certain rights to a proprietary protein, XPro1595. In connection with the agreement the Company received 1,585,000 shares of INmune common stock and an option to acquire additional shares of INmune.

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The option has a six-year term from the date of the INmune Agreement and provides the Company the option to purchase up to 10% of the fully diluted outstanding shares of INmune for $10.0 million. The Company has recorded its equity interest in INmune at cost pursuant to ASC 323, Investments – Equity Method and Joint Ventures. The Company did not record its share of the net loss from INmune during the three months ended March 31, 2021 or 2020, respectively, as the carrying value of this investment has been reduced to 0.

The Company did 0t recognize any revenue related to the INmune Agreement for the three months ended March 31, 2021 or 2020. There is 0 deferred revenue as of March 31, 2021 related to this agreement.

Janssen Biotech, Inc.

In November 2020, the Company entered into a Collaboration and License Agreement (the Janssen Agreement) with Janssen Biotech, Inc. (Janssen) pursuant to which Xencor and Janssen will conduct research and development activities to discover novel CD28 bispecific antibodies for the treatment of prostate cancer. Janssen and Xencor will conduct joint research activities for up to a three-year period to discover XmAb bispecific antibodies against CD28 and against an undisclosed prostate tumor-target with Janssen maintaining exclusive worldwide rights to develop and commercialize licensed products identified from the research activities.

Under the Janssen Agreement, the Company will conduct research activities and apply its bispecific Fc technology to antibodies targeting prostate cancer provided by Janssen. Upon completion of the research activities Janssen will have a candidate selection option to advance an identified candidate for development and commercialization. The activities will be conducted under a research plan agreed to by both parties. Janssen will assume full responsibility for development and commercialization of the CD28 bispecific antibody candidate. Pursuant to the Janssen Agreement, the Company received an upfront payment of $50.0 million and is eligible to receive up to $662.5 million in milestones which include $161.9 million in development milestones, $240.6 million in regulatory milestones and $260.0 million in sales milestones. If commercialized, the Company is eligible to receive royalties on net sales that range from the high-single to low-double digit percentages.

The Company evaluated the Janssen Agreement under ASC 606 and identified the performance obligation under the Agreement to be delivery of CD28 bispecific antibodies to Janssen from the research activities outlined in the research plan. The Company determined that the license to the bispecific antibodies is not a separate performance obligation because it is not capable of being distinct; the license to the antibodies cannot be separated from the underlying antibodies.

The Company determined that the transaction price of the Janssen Agreement at inception was $50.0 million consisting of the upfront payment. The potential milestones are not included in the transaction price as these are contingent on future events, and the Company would not recognize these in revenue until it is not probable that these would not result in significant reversal of revenue amounts in future periods. The candidate selection option payment is substantive and is a separate performance obligation. The Company will re-assess the transaction price at each reporting period and when event outcomes are resolved or changes in circumstances occur.

The Company allocated the transaction price to the single performance obligation, delivery of CD28 bispecific antibodies to Janssen.

The Company is recognizing the $50.0 million transaction price as it satisfies its performance obligation to deliver CD28 bispecific antibodies to Janssen. The Company is using the expected input method, which considers an estimate of the Company’s efforts to complete the research activities outlined in the Janssen Agreement.

The Company recognized $14.6 million of revenue under this arrangement for the three months ended March 31, 2021, and there is $35.4 million in deferred revenue as of March 31, 2021 related to our obligation to complete research activities and deliver CD28 bispecific antibodies under the Janssen Agreement.

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MiRagen Therapeutics, Inc./Viridian Therapeutics, Inc.

In December 2020, the Company entered into a Technology License Agreement (Viridian Agreement) with Viridian (formerly MiRagen), pursuant to which the Company provided Viridian a non-exclusive license to its Xtend Fc technology and an exclusive license to apply its Xtend Fc technology to antibodies targeting IGF-1R. Viridian is responsible for all development and commercialization activities. The Company received an upfront payment of 322,407 shares of Viridian common stock valued at $6.0 million and is eligible to receive up to $55.0 million in milestones, which include $10.0 million in development milestones, $20.0 million in regulatory milestones and $25.0 million in sales milestones. If commercialized, the Company is eligible to receive royalties on net sales in the mid-single digit percentage range.

The Company recognized revenue of $6.0 million from the Viridian Agreement in 2020, which includes the upfront payment of 322,407 Viridian shares at their fair value at the date of the Agreement. The shares are recorded at their fair value and adjusted to their fair value at the end of each reporting period. The Company reported unrealized gain in other income of $0.1 million for the three months ended March 31, 2021 related to the Viridian shares.

The Company did 0t recognize revenue for the three months ended March 31, 2021, and there is 0 deferred revenue as of March 31, 2021, related to this agreement.

MorphoSys AG

In June 2010, the Company entered into a Collaboration and License Agreement with MorphoSys AG (MorphoSys), which was subsequently amended. Under the agreement, we granted MorphoSys an exclusive worldwide license to the Company’s patents and know-how to research, develop and commercialize the XmAb5574 product candidate (subsequently renamed MOR208 and tafasitamab) with the right to sublicense under certain conditions. If certain developmental, regulatory and sales milestones are achieved, the Company is eligible to receive future milestone payments and royalties.

On July 31, 2020, the FDA granted accelerated approval to MorphoSys’ BLA for tafasitamab (now Monjuvi®) for marketing in the United States. In connection with the approval, the Company received a milestone payment of $25.0 million.

In the three months ended March 31, 2021, MorphoSys reported to us its plans to initiate additional clinical studies of Monjuvi, and the Company recorded a contract asset of $12.5 million as an adjustment to the total transaction price. In April 2021, MorphoSys and Incyte announced the dosing of the first patient in one of their planned clinical studies – a Phase 3 study (inMIND) evaluating the addition of tafasitamab to lenalidomide and rituximab in patients with relapsed or refractory follicular lymphoma or marginal zone lymphoma, and the contract asset was recorded as a receivable.

The Company is eligible to receive royalties in the high-single to low-double digit percentage range on approved sales of Monjuvi. Under ASC 606, the Company recognizes revenue for sales-based royalties upon the subsequent sale of the product. The Company recorded royalties for Monjuvi based on an estimate of sales to be reported by MorphoSys for the three months ended March 31, 2021.

The Company recognized $12.5 million of milestone revenue under this arrangement for the three months ended March 31, 2020. The Company recognized $1.4 million of royalty revenue and an additional $12.5 million of milestone revenue during the three months ended March 31, 2021. As of March 31, 2021, there is a contract asset of $12.5 million for a development milestone and a receivable of $1.4 million related to estimated royalties due under the arrangement. As of March 31, 2021, there is 0 deferred revenue related to this agreement.

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Novartis Institute for Biomedical Research, Inc.

In June 2016, the Company entered into a Collaboration and License Agreement (the Novartis Agreement) with Novartis Institutes for BioMedical Research, Inc. (Novartis), to develop and commercialize bispecific and other Fc engineered antibody drug candidates using the Company’s proprietary XmAb technologies and drug candidates.

Under the Novartis Agreement, the Company and Novartis are co-developing vibecotamab worldwide and sharing development costs.

NaN revenue was recognized during the three months ended March 31, 2021 or 2020 from the Novartis Agreement. As of March 31, 2021, there is a receivable of $0.9 million related to cost-sharing of development activities for the first quarter of 2021 for the vibecotamab program and $40.1 million in deferred revenue related to the obligation to deliver 2 additional Global Discovery Programs to Novartis under the arrangement.

Omeros Corporation

In August 2020, the Company entered into a Technology License Agreement (the Omeros Agreement) with Omeros Corporation. (Omeros), in which the Company provided a non-exclusive license to its Xtend Fc technology, an exclusive license to apply its Xtend technology to an initial identified antibody and options to apply its Xtend technology to 3 additional antibodies. Omeros is responsible for all development and commercialization activities for all target candidates. The Company received an upfront payment of $5.0 million and is eligible to receive up to $65.0 million in milestones, which include $15.0 million in development milestones, $25.0 million in regulatory milestones and $25.0 million in sales milestones for each product incorporating the antibodies selected. In addition, the Company is eligible to receive royalties in the mid-single digit percentage range on net sales of approved products.

The Company did 0t recognize any revenue related to the Omeros Agreement for the three months ended March 31, 2021. There is 0 deferred revenue as of March 31, 2021 related to this agreement.

Vir Biotechnology, Inc.

In the third quarter of 2019, the Company entered into a Patent License Agreement (the Vir Agreement) with Vir Biotechnology, Inc. (Vir) pursuant to which the Company provided a non-exclusive license to its Xtend technology for up to 2 targets. Under the terms of the Vir Agreement, the Company received an upfront payment and is eligible to receive total milestones of $155.0 million which include $5.0 million of development milestones, $30.0 million of regulatory milestones and $120.0 million of sales milestones. In addition, the Company is eligible to receive royalties on the net sales of approved products in the low single digit percentage range.

The Company evaluated the Vir Agreement and determined that the single performance obligation was access to a non-exclusive license to certain patents of the Company, which were transferred to Vir upon execution of the Vir Agreement in July 2019.

In March 2020, the Company entered into a second Patent License Agreement (the Second Vir Agreement) with Vir pursuant to which the Company provided a non-exclusive license to its Xtend technology to extend the half-life of novel antibodies Vir is investigating as potential treatments for patients with COVID-19. Under the terms of the Second Vir Agreement, Vir is responsible for all research, development, regulatory and commercial activities for the antibodies, and the Company is eligible to receive royalties on the net sales of approved products in the mid-single digit percentage range.

The Company determined that the Second Vir Agreement was a modification of the original agreement and the transfer of the license occurred at inception of the Vir Agreement. The total consideration under the arrangement did not change with the Second Vir Agreement as the Company will potentially receive additional royalty revenue which is variable consideration and is not included in the transaction price.

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In February 2021, the Company entered into the Vir Amendment No. 1 to the Vir Agreement and the Vir Amendment No. 1 to the Second Vir Agreement (collectively, the Vir Amendments), in which the Company provided a non-exclusive license to additional Fc technology for the targets previously identified in the Vir Agreement and the Second Vir Agreement. If Vir incorporates additional Fc technologies in the identified targets, the Company is eligible to receive additional royalties on net sales of approved products from low to mid-single digit range.

The Company determined that the Second Vir Agreement and the Vir Amendments were modifications of the original Vir Agreement, and the transfer of the license occurred at inception of the Vir Agreement. The total consideration under the arrangement did not change with the Amended Vir Agreement as the Company will potentially receive additional royalty revenue which is variable consideration and is not included in the transaction price.

The Company did 0t recognize revenue for the three months ended March 31, 2021 or 2020, and there is 0 deferred revenue as of March 31, 2021 related to this agreement.

Zenas BioPharma Limited License Agreement

In November 2020, the Company entered into a License Agreement (the Zenas Agreement) with Zenas, pursuant to which the Company granted Zenas exclusive worldwide rights to develop and commercialize 3 preclinical-stage Fc-engineered drug candidates: XmAb6755, XPro9523 and XmAb10717. Under the Zenas Agreement, Zenas will be responsible for all further development and commercialization activities for the candidates. The Company received a 15% equity interest in Zenas with a fair value of $16.1 million, and the Company is eligible to receive royalties on net sales of approved products in the mid-single digit to mid-teen percentage range.

The total transaction price is $16.1 million, which includes the upfront payment of 15% of the equity of Zenas at its fair value at the date of the Zenas Agreement. The Company recorded licensing revenue of $16.1 million for the Zenas Agreement for the three months ended December 31, 2020. The equity in Zenas is recorded at the fair value at the date of the Zenas Agreement and is reviewed each reporting period for impairment or other evidence of change in value. The Company did not record an impairment or change in the value of the Zenas equity at March 31, 2021.

The Company did 0t recognize any revenue related to the agreement for the three months ended March 31, 2021. There is 0 deferred revenue as of March 31, 2021 related to this agreement.

Revenue earned

The revenues recorded for the three months ended March 31, 2021 and 2020 were earned principally from the following licensees (in millions):


	Three Months Ended
	March 31,
	2021		2020

Aimmune	$	—	$	9.6
Alexion		5.3		3.3
Astellas		—		0.3
Genentech		0.2		0.7
Gilead		—		6.0
Janssen		14.6		—
MorphoSys		13.9		12.5
Total	$	34.0	$	32.4

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~~Revenue earned~~

~~The revenues recorded for the three months ended March 31, 2020 were earned principally from the following licensees (in millions):~~

Three Months Ended

March 31,

2020

2019

Aimmune

$
9.6

$
—

Alexion


3.3


—

Astellas

0.3

—

Genentech

0.7

112.0

Gilead

6.0

—

MorphoSys

12.5

—

Total

$
32.4

$
112.0

The table below summarizes the disaggregation of revenue recorded for the three months ended March 31, 2021 and 2020 (in millions):


	Three Months Ended				Three Months Ended
	March 31,				March 31,
	2020		2019		2021		2020

Research collaboration	$	1.0	$	0.3	$	14.8	$	1.0
Milestone		12.5		—		12.5		12.5
Licensing		15.6		111.7		—		15.6
Royalties		3.3		—		6.7		3.3
Total	$	32.4	$	112.0	$	34.0	$	32.4

Remaining Performance Obligations and Deferred Revenue

The Company’s remaining performance obligations are delivery of 2 Global Discovery Programs under the Novartis Agreement and ~~the conduct of~~conducting research activities pursuant to research plans under the Genentech and Janssen Agreements. The Company has completed its performance obligations for research activities pursuant to the Astellas ~~Agreements.~~Agreement in the second quarter of 2020. As of March 31, ~~2020~~2021 and ~~2019,~~2020, the Company has deferred revenue of $77.8 million and $46.2 million, ~~and $63.1 million,~~ respectively. ~~As of March 31, 2020, all~~All deferred revenue is classified as current liabilities as the Company’s obligations to perform services are due on demand when requested by Novartis ~~and by Astellas~~ under the Novartis Agreement and ~~Astellas Agreements, respectively.~~by Janssen under the Janssen Agreement. The Company’s obligation to perform research services to Genentech will end ~~within one year. As of March 31, 2019, $59.2 million was classified as current liabilities for the same reason, and $3.9 million~~upon expiration of the ~~deferred revenue liability was classified as long-term for the portion of obligations to perform~~ research ~~services to Genentech after one year.~~term.

10. Income taxes

~~On March 27, 2020, the president signed the Coronavirus Aid, Relief and Economic Security (CARES) Act. The legislation provides several changes to corporation income taxes including:~~

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~~Deferral of employer payroll taxes for the remainder of 2020, with repayment of the deferred amounts in December 2021 and in December 2022.~~

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~~Modification of the rules applicable to the deductibility of net operation losses (NOLs) incurred in tax years beginning in 2018, 2019 and 2020.~~

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~~Acceleration of the corporate minimum tax credit.~~

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~~The Company reviewed the new legislation and determined that certain provisions would provide income tax benefits:~~

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The Company qualifies for the deferral of payroll taxes and expects to benefit from this provision. NaN deferral was recorded for the period ended March 31, 2020, but the Company expects to defer its payroll tax liabilities for the remainder of 2020.

●

The Company has NOL and income tax credit carryforwards which are subject to a valuation allowance, due to uncertainty about the ability to utilize such losses and credits in future periods. Accordingly, the Company does not expect the changes in the NOL provisions in the legislation to provide any benefit in the near-term.

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As of December 31, 2019, the Company had recorded a receivable of $0.8 million related to the corporate minimum tax credit. Under previous income tax provisions, one-half of the minimum tax credit would be received in 2020 and the remainder in subsequent years. As a result of the new legislation, the Company expects to receive a refund for the entire $0.8 million minimum tax credit in 2020.

There was no0 provision for income taxes for the three months ended March 31, 2021 or 2020. The provision for income taxes of $0.9 million for the three months ended March 31, 2019 represents the interim period tax allocation of the state alternative minimum tax based on the Company’s projected year-end effective income tax rates which cannot be offset by the Company’s net operating loss carryforwards. The Company has a federal income tax receivable of $0.8 million at March 31, 2020 related to refundable alternative minimum tax credits and a state income tax receivable of $0.1 million related to overpayment of prior year taxes. As of March 31, ~~2020,~~2021, the Company’s deferred income tax assets, consisting primarily of net operating loss and tax credit carryforwards, have been fully offset by a valuation allowance.On March 11, 2021, President Biden signed into law the American Rescue Plan Act of 2021; these provisions are not expected to have a material impact on the Company’s income tax provision.

ITEM 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion and analysis should be read in conjunction with our financial statements and accompanying notes included in this Quarterly Report on Form 10-Q and the financial statements and accompanying notes thereto for the fiscal year ended December 31, ~~2019~~2020 and the related Management’s Discussion and Analysis of Financial Condition and Results of Operations, both of which are contained in our Annual Report on Form 10-K for the year ended December 31, ~~2019.~~2020. See also “Special Note Regarding Forward-Looking Statements” included in this Quarterly Report on Form 10-Q.

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Company Overview

We are a clinical-stage biopharmaceutical company focused on discovering and developing engineered monoclonal antibody and ~~other protein~~cytokine therapeutics to treat ~~severe~~patients with cancer and ~~life-threatening~~autoimmune diseases ~~with~~who have unmet medical needs. We are ~~developing~~advancing a ~~suite~~broad portfolio of clinical-stage drug candidates ~~by ourselves and with partners,~~ from our proprietary XmAb® technology ~~platforms that are designed~~platforms. We use our protein engineering capabilities to ~~treat cancer~~increase our understanding of protein structure and ~~autoimmune diseases.~~interactions and to design new XmAb technologies and development candidates with improved properties. In contrast to conventional approaches to antibody design, which focus on the segment of antibodies that interact with target antigens, our protein engineering efforts and the XmAb technologies are focused on the ~~parts~~Fc domain, the part of ~~the~~an antibody that ~~interact~~interacts with multiple segments of the immune system and ~~control~~controls antibody structure. ~~This segment, referred to as the~~The Fc domain is constant and interchangeable among ~~antibodies. Our~~antibodies, and our engineered Fc domains, the XmAb technology, can be readily substituted for natural Fc domains.

Our ~~business strategy is based on the plug-and-play nature of the~~protein engineering capabilities and XmAb ~~technology, allowing~~technologies enable us and our partners to develop antibodies and biotherapeutic drug candidates with improved properties and function, which can provide innovative approaches to treating disease and potential clinical advantage over other treatment options. For example, our capabilities have enabled us to develop an antibody scaffold to rapidly create novel bispecific antibodies that bind two different targets simultaneously, creating entirely new ~~antibody drug candidates for our internal development or licensing, or to selectively license access to one or more~~biological mechanisms. Other applications of our XmAb technologies enhance antibody performance by increasing immune inhibitory activity, improving cytotoxicity, extending circulating half-life and stabilizing novel protein structures, such as engineered cytokines. Currently, there are two marketed drugs that have been developed with our XmAb technologies.

Refer to ~~pharmaceutical or biotechnology companies to use~~Part I, Item 1, “XmAb Bispecific Technologies” and “Other XmAb Fc Technologies” in ~~developing their own proprietary antibodies with improved properties.~~the description of our business included in our Annual Report on Form 10-K for the year ended December 31, 2020 for a discussion of our core Fc technology platforms.

COVID-19

We are closely monitoring the COVID-19 pandemic ~~caused by the novel coronavirus SARS-CoV-2 which causes the disease COVID-19,~~ and ~~are evaluating~~continue to evaluate its impact on all aspects of our business including how it will affect our partners, collaborations, supply chains and ~~our~~ research and development operations. While the pandemic did not significantly disrupt our

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business during the three months ended March 31, ~~2020,~~2021, the evolving nature of the pandemic prevents us from reasonably predicting how the pandemic will affect our financial condition, results of operations and cash flows due to numerous uncertainties. These uncertainties include the scope, severity and duration of the pandemic, the actions taken to contain the pandemic or mitigate its impacts and the direct and indirect economic effects of the pandemic

and containment measures, among others. Many states, including California, where we are headquartered and where our principal place of business is located, and cities therein have instituted quarantines, restrictions, ~~on travel, stay at home~~ rules and ~~restrictions on types~~guidelines that affect the continued operation of ~~business that may continue to operate.~~businesses. Other countries and states where we conduct manufacturing of our drug product, testing activities and clinical sites where patients are enrolled in our clinical trials have enacted similar restrictions that could affect our ability to conduct our drug candidate development and clinical operations.

The potential impacts on our business, revenue, clinical studies and research and development activities of the COVID-19 pandemic include:

●

Business: Our broad protein engineering capabilities and technologies are uniquely suited to provide us with opportunities to identify and enhance compounds that ~~can successfully~~may target the novel coronavirus and potentially treat patients with COVID-19. ~~Two companies are advancing antibodies~~For example, our partner, Vir Biotechnology, Inc. is evaluating VIR-7831, an antibody that ~~incorporate~~targets the SARS-CoV-2 in Phase 3 development. VIR-7831 incorporates our Xtend Fc ~~technology:~~

~~Alexion Pharmaceuticals, Inc.:~~ ~~Our partner, Alexionannounced initiation~~technology for longer duration of ~~a Phase 3 trial~~action. VIR-7832, which also targets the SARS-CoV-2 virus, also incorporates Xtend technology as well as other XmAb Fc technologies, and it is in the preclinical stages of ~~Ultomiris® in treating patients with severe COVID-19 symptoms.~~development. We are eligible to receive ~~sales milestones and a continued low-single digit percent royalty on the sales of Ultomiris®.~~

~~Vir Biotechnology, Inc~~~~.: Our partner VirBio is initiating a Phase 2 study with an antibody drug candidate that is targeting the SARS-CoV-2 virus. We are eligible to~~ ~~receive~~ a mid-single digit percentage royalty on the net ~~sales of approved products for this candidate.~~sales.

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Revenue: We receive upfront payments, milestone payments ~~royalties~~ and ~~cost-sharing payments~~royalties from licensing our XmAb technologies and drug ~~candidates and from our co-development arrangements.~~candidates. The COVID-19 pandemic ~~did~~has not adversely ~~affect~~affected our revenues for the

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quarter ended March 31, ~~2020. We have~~2021. During the quarter, for example, we generated approximately $34.0 million in revenue from ~~new~~our partnerships and collaborations ~~with Gilead~~including Janssen, MorphoSys, and ~~Aimmune, $6.0~~Alexion, recognizing $14.6 million, $13.9 million, and ~~$9.6 million of revenue, respectively and also generated revenue from existing partnerships, including Alexion and MorphoSys, recognizing $3.3 million and $12.5~~$5.3 million of revenue, respectively.

Our ability to ~~continue to~~ earn revenue from these and other partnerships is dependent on the ~~partners’~~ ability of our partners to generate sales offrom products, such as ~~our royalties from Ultomiris®,~~Ultomiris and Monjuvi, the ability of our partners to ~~continue to advancing their~~advance our partnered programs through regulatory approval ~~such as the MorphoSys’ tafasitamab program,~~ and the ability of our partners to advance our partnered programs into later stages of development, which provide us with potential milestone payments. If the COVID-19 pandemic continues for an extended period and adversely ~~affect~~affects the sales or clinical, development and regulatory progress of partnered programs, the amount of revenue we could earn would be adversely affected.

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Clinical studies: We are currently enrolling patients in ~~six~~seven clinical programs, and our partner Genentech is enrolling patients in the Phase 1 study of ~~XmAb24306,~~XmAb306 (also known as RG6323), our co-development program with Genentech. ~~The COVID-19~~Many partners are also enrolling patients in clinical trials with drug candidates that incorporate one or more XmAb technologies. Although the pandemic ~~did~~has not ~~affect~~materially affected our clinical development for the period ended March 31, ~~2020. While~~2021, some of our clinical ~~studies in oncology are still~~programs have experienced slower patient enrollment as a ~~high priority for patients, their families~~result of the pandemic. These delays have not broadly affected the status of our portfolio programs and ~~their physicians, our planned study initiations~~have been limited to specific trials and ~~our ongoing studies will be affected in subsequent periods, as many~~specific sites. Many clinical sites have delayed starting new clinical trials and others have postponed enrollment to address the ~~COVID-19~~ pandemic.

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Research and development activities: ~~In connection with the COVID-19 pandemic we required~~We require all ~~of our~~ non-laboratory employees to ~~begin working~~work remotely, and we have implemented ~~a reduced~~additional health, safety and environmental procedures for all onsite laboratory research ~~operation.~~employees. We have also offered reimbursement of costs incurred and time off to employees to receive vaccinations that have been ~~able to continue our research activities in a scaled back manner while providing~~authorized. We believe we provide a safe and healthy environment for our onsite employees who have been able to continue research ~~employees. Our development~~operations, following an initial period of reduced onsite activities ~~include manufacturing,~~while new policies and ~~conducting Investigational New Drug application (IND) enabling studies for~~

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~~XmAb27564, our IL-2-Fc cytokine candidate, as well as other bispecific antibody candidates in early stages of development.~~procedures were developed and implemented. As of March 31, ~~2020,~~2021, these activities have continued ~~remotely~~ without interruption from the COVID-19 pandemic. However, the conduct of all our development activities rely on our employees and on third party vendors. If the COVID-19 pandemic affects our employees, our vendors or other parties in the supply chain required to continue research and development activities, the research and development activities and our expected timelines for completing such activities, including submission of INDs will be adversely affected.

~~Wholly Owned~~Our development activities include conducting investigational new drug (IND)-enabling studies for XmAb819. Several other bispecific antibody and ~~Co-Developed~~cytokine programs are in earlier stages of development. During the third quarter of 2020, the manufacturers of our drug supplies notified us of critical shortages of materials used in their manufacturing processes due to pandemic-related reallocation of resources. The shortages will not affect our current clinical programs as we have sufficient supply of drug material to continue the ongoing trials without interruption. However, the shortages have extended the development timelines of early-stage development candidates, including XmAb819, by three to six months based on current information from our vendors. The development timelines for additional early-stage programs and ongoing clinical programs could be affected if the supply interruption extends longer than current estimates.

Clinical-Stage XmAb Bispecific Antibody and Cytokine Drug ~~Candidates~~Candidate Updates

~~There~~Our modular XmAb bispecific technology and protein engineering capabilities enable us to rapidly advance multiple drug candidates into clinical development. We and our partners are currently ~~17 antibody product~~enrolling Phase 1 studies for seven wholly owned or co-development candidates ~~that are being advanced~~to treat patients with many different types of cancer, and an eighth, in development for patients with autoimmune disease, entered clinical trials by us or by our partners that have been engineered with our XmAb technologies. The most recent expansion of our platform is the XmAb bispecific Fc domains, which enable the rapid design and simplified development ~~of antibodies, and other protein structures, that can bind two or more different targets simultaneously. These bispecific Fc domains are used to generate a broad array of novel drug candidates.~~in April 2021.

~~CD3 candidates:~~Plamotamab (CD20 x CD3): ~~The initial~~Plamotamab is a bispecific antibody ~~candidates~~ that ~~we designed contain~~targets CD20, an ~~anti-tumor associated~~ antigen ~~binding domain~~on B-cell tumors, and ~~a second binding domain targeted to~~ CD3, an activating receptor on T cells. ~~The goal~~Preliminary safety and anti-tumor activity from the ongoing Phase 1 dose-escalation study of ~~the “CD3 bispecific” is to recruit~~plamotamab in B-cell malignancies, including from patients with relapsed or ~~activate T cells against tumor cells expressing the antigen target.~~refractory non-Hodgkin's lymphoma (NHL), indicate that plamotamab was generally well tolerated and demonstrated encouraging clinical activity as a monotherapy. We are currently ~~conducting Phase 1 studies for three CD3 bispecific antibody candidates:~~ ~~vibecotamab, plamotamab~~ ~~and~~ ~~tidutamab~~.

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~~Vibecotamab (XmAb14045)~~ is a bispecific antibody that targets CD123, an antigen on acute myeloid leukemia (AML) cells and leukemic stem cells, and CD3, an activating receptor on T cells. It is being developed in collaboration with our partner, Novartis. In 2020, we have continued enrolling patients ~~with AML in an ongoing Phase 1 study and we plan to initiate additional clinical studies evaluating vibecotamab.~~

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~~Plamotamab (XmAb13676)~~ is a bispecific antibody that targets CD20, an antigen on B-cell tumors, and CD3 for the treatment of B-cell malignancies. We continue to enroll patients with B-cell malignancies in an ongoing Phase 1 study, and we plan to initiate additional clinical studies evaluating plamotamab.

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~~Tidutamab (XmAb18087)~~ is a bispecific antibody that targets somatostatin receptor 2 (SSTR2), a target on neuroendocrine tumors (NET) and gastrointestinal stromal tumors (GIST), and CD3. We continue to enroll patients with NET or GIST in the Phase 1 study, and we expect to provide initial data from this study in the second half of 2020.

~~TME activator candidates:~~ We are also advancing a suite of tumor microenvironment (TME) activators that have been designed to promote tumor-selective T cell activation by targeting multiple checkpoint or co-stimulatory receptors. These TME activator candidates use our bispecific Fc domain and incorporate our Xtend technology for longer half-life. We are currently conducting Phase 1 studies for three TME activator candidates: XmAb20717, XmAb22841 and XmAb23104:

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~~XmAb20717~~ targets PD-1 and CTLA-4, two immune checkpoint receptors, to activate the tumor microenvironment selectively, and is being developed in broad oncology indications including solid tumors. We are enrolling patients with advanced non-small cell lung cancer, renal cell carcinoma, prostate cancer and other cancers without approved checkpoint therapies to expansion cohorts in an ongoing Phase 1 study, and the study continues to enroll patients in additional dose-escalation cohorts. An expansion cohort for patients with melanoma is fully enrolled. The American Society of Clinical Oncology (ASCO) accepted an abstract that we submitted with initial data from the dose-escalation portion of the Phase 1 study, and ASCO has indicated that it will publish the abstract on its website on May 13, 2020.

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~~XmAb23104~~ targets PD-1 and ICOS, an immune co-stimulatory receptor, and is being developed for multiple oncology indications. We continue to enroll patients with selected solid tumors in the Phase 1 dose-escalation study.

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~~XmAb22841~~ targets CTLA-4 and LAG-3, also an immune checkpoint receptor, and is being developed for multiple indications. We intend to advance XmAb22841 in combination with pembrolizumab, an inhibitor of the PD1 checkpoint receptor to create a triple checkpoint blockade. We continue to enroll patients with select solid tumors in the Phase 1 single-agent dose-escalation portion of the study and expect to dose the first patient with the combination in 2020.

~~Cytokine candidates:~~ The most recent expansion of our bispecific Fc platform is our novel cytokine candidates. These cytokines are built on our bispecific Fc domain and have potency tuned to improve therapeutic index. These candidates are built on our bispecific Fc domain and have potency tuned to improve therapeutic index, and also incorporate our Xtend technology for longer half-life.

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~~XmAb24306~~ is an IL15/IL15-receptor alpha complex fused to a bispecific Fc domain (IL15/IL15Ra-Fc). In February 2019, we entered into the Genentech Agreement to develop and commercialize novel IL-15 cytokine therapeutics, whereby the companies will co-develop XmAb24306 and other potential IL-15 programs. In March 2020, Genentech dosed the first patient in a Phase 1 dose-escalation study with XmAb24306. The study is designed to determine initial safety and potential efficacy of XmAb24306 before advancing it into further clinical studies in combination with other agents.

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~~XmAb27564~~ is an IL-2 Fc fusion protein with our bispecific Fc domain that we intend to develop for the treatment of patients with autoimmune diseases. We are currently conducting IND-enabling studies for XmA27564 and plan to submit an IND for this candidate in 2021.

~~We have also created an antibody therapeutic compound using our Immune Inhibitor Fc Domain.~~

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~~Obexelimab (XmAb5871)~~ uses our XmAb Immune Inhibitor Fc Domain and targets CD19 with its variable domain. Obexelimab is designed to inhibit the function of B cells, an important component of the immune system. We believe that obexelimab has the potential to address a key unmet need in autoimmune disease due to its combination of potent reversible B-cell inhibition without B-cell depletion, enabling the immune system to resume natural function once treatment is no longer needed. We have completed Phase 2 clinical trials for obexelimab in three autoimmune disease areas: Systemic Lupus Erythematosus (SLE), IgG4-Related Disease (IgG4-RD), and Rheumatoid Arthritis (RA). We have also completed a Phase 1 bioequivalence trial using a subcutaneous (SC) formulation, and we expect that further clinical studies of obexelimab could be conducted with the SC formulation. We believe that the clinical trials that we have conducted with obexelimab show the potential of this molecule in treating B-cell mediated autoimmune indications. We are looking to continue developing obexelimab in additional late-stage clinical trials with a partner that has the resources and infrastructure to maximize the potential of this compound.

~~Licensing Partnerships~~

An important part of our business strategy is to leverage the value of our Fc technologies and drug candidates with partnerships and collaborations. We have ten partnerships for the licensing of our XmAb technologies and drug candidates. These arrangements provide upfront payments, annual licensing fees, potential milestone payments and royalties as our partners advance XmAb technologies and drug candidates through clinical development and commercialize products that gain regulatory approval. These payments provide us with multiple revenue streams that help fund development of our product candidates, and the partnerships usually require limited resources or efforts from us. Where possible, we structure such transactions to retain long-term value in ~~the drug candidates through profit-split arrangements or retaining U.S. commercial rights.~~

this study. In November 2020, we entered ~~into licensing transactions~~a strategic clinical collaboration with ~~Aimmune Therapeutics, Inc. and Gilead Sciences, Inc. for which we received total payments~~MorphoSys AG to investigate the chemotherapy-free triple combination of $9.6 million and $13.5 million, respectively. In 2020, we have also extended our licensing partnership with VirBio whereby VirBio will have non-exclusive access to Xtend Fc technology to extend the half-life of antibodies that VirBio is investigating as potential treatments for patients with COVID-19, the disease caused by the novel coronavirus SARS-CoV-2.

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~~The~~plamotamab, tafasitamab and lenalidomide in patients with relapsed or refractory diffuse large B cell lymphoma (DLBCL), first-line DLBCL and relapsed or refractory follicular lymphoma (FL). We plan to initiate the first of these studies, in patients with relapsed or refractory DLBCL, an aggressive type of NHL, in late 2021 or early 2022.

XmAb717 (PD-1 x CTLA-4): XmAb717 is a bispecific antibody that targets PD-1 and CTLA-4, two immune checkpoint receptors, to selectively activate the tumor microenvironment, and it is being developed in multiple types of solid tumors, including for patients with castration-resistant prostate cancer. Data from the ongoing Phase 1 study indicate that XmAb717 was generally well-tolerated, and the most common treatment-related adverse events were immune-related adverse events (irAEs); however, rates of irAEs, including colitis, were lower than typically observed with CTLA-4 blockade. Clinical responses were observed in all expansion cohorts, and the objective response rate across cohorts was 19.0%. In mid-2021, we plan to initiate a Phase 2 study of XmAb717 for patients with certain molecular subtypes of CRPC, as a monotherapy or in combination depending on the subtype, as these patients represent a high unmet medical need.

Vibecotamab (CD123 x CD3): Vibecotamab is a bispecific antibody that targets CD123, an antigen on acute myeloid leukemia (AML) cells and leukemic stem cells, and CD3, an activating receptor on T cells. We continue enrolling patients with AML in an ongoing Phase 1 dose escalation study and are reviewing data with our partner, Novartis, in planning additional studies of vibecotamab.

Tidutamab (SSTR2 x CD3): Tidutamab is a bispecific antibody that targets somatostatin receptor 2, (SSTR2), a target on many neuroendocrine-like tumor types, and CD3. Initial dose-escalation data from the ongoing Phase 1 study in patients with neuroendocrine tumors (NET) indicate that tidutamab was generally well tolerated at the recommended dose identified for the expansion portion of the study. Because tidutamab induced sustained activation of cytotoxic T cells and engagement of the SSTR2 target and has an encouraging safety profile, we plan to initiate a clinical study for tidutamab in patients with Merkel cell carcinoma and small cell lung cancer, SSTR2-expressing tumor types known to be responsive to immunotherapy, in mid-2021.

XmAb306/RO7310729 (IL15/IL15Rα-Fc Cytokine): XmAb306 is an IL15/IL15Rα-Fc fusion protein that incorporates our Xtend extended half-life technology, and we are co-developing this program, as well as other potential IL-15 programs, in collaboration with Genentech. Genentech has dosed cohorts of the Phase 1 study of XmAb306 as a single agent and in combination with atezolizumab.

XmAb564 (IL2-Fc Cytokine): XmAb564 is a wholly owned, monovalent interleukin-2 Fc (IL-2-Fc) fusion protein, engineered to selectively activate and expand regulatory T cells (Tregs) for the potential treatment of patients with autoimmune diseases. XmAb564 is engineered with reduced binding affinity for IL-2's beta receptor and increased binding affinity for its alpha receptor. In preclinical studies, XmAb574 was well-tolerated, promoted the selective and sustained expansion of Tregs and exhibited a favorable pharmacokinetic profile. In April 2021, the first subject was dosed in a randomized, double-blind, placebo-controlled Phase 1 clinical study that will evaluate the safety and tolerability of XmAb564, administered subcutaneously in healthy adult volunteers.

Additional wholly owned XmAb bispecific antibody programs in Phase 1 clinical studies include XmAb841 (CTLA-4 x LAG-3) and XmAb104 (PD-1 x ICOS). We continue enrolling patients with advanced ~~program~~solid tumors to these studies. A new study of XmAb698 (CD38 x CD3) is currently being planned to start later in 2021.

Advancements Expanding XmAb Bispecific Platforms

We conduct further research into the function and application of antibody Fc domains in order to expand the scope of our XmAb technology platforms and identify additional XmAb drug candidates. We use the modularity of our XmAb bispecific Fc technology to build bispecific antibodies and cytokines in a variety of formats, and we recently introduced CD3 bispecific antibodies of a mixed valency format, the XmAb 2+1 bispecific antibody. XmAb 2+1 bispecific antibodies may preferentially kill tumor cells with high target expression, which may be especially beneficial in designing antibodies that target solid tumors. This selectivity potentially empowers CD3 bispecifics to address an expanded set of tumor antigens. Our lead XmAb 2+1 bispecific antibody candidate is XmAb819, a first-in-class ENPP3 x CD3 bispecific antibody. ENPP3 is a tumor-associated antigen in renal cell carcinoma (RCC) and exhibits low level

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expression on normal tissues. We plan to submit an IND application for XmAb819 in 2021 and initiate a Phase 1 study in early 2022.

Additionally, we have engineered CD28 bispecific antibodies to provide conditional CD28 co-stimulation of T cells, activating them when bound to tumor cells. Targeted CD28 bispecific antibodies may provide conditional co-stimulation of T cells, for example, to T cells recognizing neoantigens or in concert with CD3 T-cell engaging bispecific antibodies. Our CD28 platform is also the subject of our collaboration with Janssen Biotech, Inc., announced in December 2020, where we are creating and characterizing CD28 bispecific antibody candidates against a prostate tumor target specified by Janssen. We are also advancing our wholly owned CD28 candidates including our lead candidate, a B7-H3 x CD28 bispecific antibody designed to be evaluated for the treatment of patients with a range of solid tumors, and it is currently advancing through preclinical development.

In April 2021, we presented emerging preclinical data from early-stage programs that highlight the potential of the XmAb 2+1 bispecific antibody format and the CD28 platform at the American Association for Cancer Research (AACR) Annual Meeting.

Progress Across Partnerships

A key part of our business strategy is to leverage our protein engineering capabilities, XmAb technologies and drug candidates with partnerships, collaborations and licenses. We have fifteen partnerships for the licensing of our XmAb technologies and drug candidates. Through these arrangements we generate revenues in the form of upfront payments, milestone payments and royalties. For partnerships for our drug candidates, we aim to retain a major economic interest in the form of keeping major geographic commercial rights; profit-sharing; co-development options; and the right to conduct studies with drug candidates developed in the collaboration. The types of arrangements that we have entered with partners include product licenses, novel bispecific antibody collaborations, technology licensing agreements and strategic collaborations.

Product Licenses

Product licenses are arrangements in which we have internally developed drug candidates and, based on a strategic review, licensed partial or full rights to third parties to continue development and potential commercialization. We seek partners that can provide infrastructure and resources to successfully develop our drug candidates, have a track record of successfully developing and commercializing medicines, or have a portfolio of development-stage candidates and commercialized medicines which could potentially be developed in rational combinations with our drug candidates.

The U.S. FDA approved Monjuvi® (tafasitamab-cxix), the second product with XmAb technology to be approved for commercial marketing, under accelerated approval in July 2020. Monjuvi is ~~Alexion’s Ultomiris®~~a CD19-directed cytolytic antibody indicated in combination with lenalidomide for the treatment of adult patients with relapsed or refractory diffuse large B-cell lymphoma (DLBCL) not otherwise specified , ~~a complement inhibitor antibody, to allow~~including DLBCL arising from low grade lymphoma, and who are not eligible for ~~a longer duration of action, less frequent dosing and reduced patient burden of therapy compared to Alexion’s previous generation therapy, Soliris®~~autologous stem cell transplant (ASCT). ~~Alexion~~This indication is approved under accelerate approval based on overall response rate. Continued approval for this indication may be contingent upon verification and description of clinical benefit in a confirmatory trial(s). The antibody was created and initially developed by us. Monjuvi is co-commercialized in the U.S. by MorphoSys and Incyte. The European Marketing Authorization Application for tafasitamab is currently under review by the European Medicines Agency. In April 2021, MorphoSys and Incyte announced the initiation of a Phase 3 study (inMIND) evaluating the addition of tafasitamab to lenalidomide and rituximab in patients with relapsed or refractory follicular lymphoma or marginal zone lymphoma. In the first quarter of 2021, we earned $12.5 million for the development milestone and recognized royalty revenue of $1.4 million on net sales of Monjuvi. Monjuvi® is a registered trademark of MorphoSys AG.

A second IL-15 cytokine candidate, which is engineered with a target-specific binding arm, is in preclinical development under our Genentech collaboration. As a Collaboration Product under the agreement, we share in 45% of development and commercialization costs, while Genentech will pay for commercial launch costs, and we will receive a 45% share of net profits from sales from all collaboration products, while also sharing in the net losses at the same

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percentage rate. We are eligible to receive up to $180.0 million in clinical milestone payments for this candidate. Genentech is currently conducting IND-enabling studies for this candidate.

In November 2020, we entered into an agreement with Zenas (previously undisclosed), to which we licensed the exclusive worldwide rights to develop and commercialize three preclinical-stage Fc-engineered drug candidates for autoimmune disease. Zenas is a cross-border biopharmaceutical company committed to becoming a global leader in the development and delivery of immune-based therapies for patients in China and around the world. XmAb6755, XPro9523 and XmAb10717 incorporate an Xtend Fc Domain, a Cytotoxic Fc Domain, or both. Zenas has indicated that these programs, which they have collectively named ZB002, ZB003 and ZB004, are undergoing IND-enabling studies to support clinical development for both new and established autoimmune disease indications. We received a 15% equity interest in the company, and we will also receive royalties on net sales of approved products in the mid-single digit to mid-teen percentage range.

Technology License Agreements

We enter into technology licensing agreements in which we license access to one or more of our XmAb Fc technologies on a restricted basis, typically to an XmAb Cytotoxic Fc Domain and/or the Xtend Fc Domain. Our partners are responsible for all research, development and commercialization activities of the drug candidates. The plug-and-play nature of XmAb technologies allows us to license access to our platforms with limited or no internal research and development activities.

Alexion’s Ultomiris® uses Xtend Fc technology for longer half-life. Ultomiris has received marketing authorizations from regulatory agencies in the U.S., Europe and Japan for the treatment of adult patients with ~~the rare blood disease~~ paroxysmal nocturnal hemoglobinuria (PNH) and ~~is also approved in the U.S.~~ for ~~the treatment of~~ patients with atypical hemolytic uremic syndrome (aHUS). ~~In March 2020,~~ Alexion ~~announced it was initiating a Phase 3 study of~~is also evaluating Ultomiris in ~~treating patients with severe COVID-19, adults who are hospitalized with severe pneumonia or acute respiratory distress syndrome (ARDS).~~a broad late-stage development program across many indications in neurology and nephrology. In the first quarter of 2021, we earned $5.3 million in royalties from Alexion.

Examples of other partnerships and collaborations in which we have licensed XmAb technologies and candidates to other biopharmaceutical companies for further development include those with MorphoSys, Amgen, Novartis, Gilead and VirBio:

●

~~MorphoSys AG~~: In 2010, we licensed exclusive worldwide rights to develop and commercialize tafasitamab (MOR208) to MorphoSys. In February 2020, the FDA accepted MorphoSys’ Biologics License Application (BLA) and granted priority review for tafasitamab in combination with lenalidomide for the treatment of relapsed/refractory diffuse large B cell lymphoma (r/r DLBCL), and we received a milestone payment of $12.5 million. The FDA has set a Prescription Drug User Fee Act (PDUFA) goal date of August 30, 2020. We are eligible to receive an additional $25.0 million regulatory milestone payment related to DLBCL and royalties on net sales of tafasitamab in the high-single to low-double digit percent range.

●

~~Amgen, Inc.~~: In 2015, we entered into a research and license agreement with Amgen to develop and commercialize products using our bispecific technology. Amgen is evaluating AMG 424, a bispecific antibody that targets CD38 and CD3, in a Phase 1 study in patients with multiple myeloma. Amgen also applied our bispecific Fc technology to create, AMG 509, a STEAP1 x CD3 2+1 bispecific antibody, which Amgen is developing for patients with prostate cancer and Ewing sarcoma. Preclinical data were presented at the American Association for Cancer Research (AACR) Virtual Annual Meeting I in April 2020. Amgen is recruiting patients in a Phase 1 study of AMG 509 in patients with metastatic castration-resistant prostate cancer (mCRPC).

●

~~Novartis Institutes for BioMedical Research~~: In connection with our 2016 Novartis collaboration, we created and licensed to Novartis an undisclosed bispecific antibody candidate. In December 2019, Novartis dosed the first patient in a Phase 1 study for this drug candidate.

●

~~Gilead Sciences, Inc.~~: In January 2020, we provided Gilead an exclusive license to our Cytotoxic Fc and Xtend Fc technologies for elipovimab (GS-9722), an anti-HIV antibody that Gilead is advancing in a Phase 1 study. In connection with the license, we provided Gilead with options to three additional antibodies directed to the same molecule target as elipovimab. In March 2020, Gilead exercised two of the remaining options and in April 2020, Gilead exercised the final option. We received an upfront payment of $6.0 million in the first quarter of 2020 and option payments of $7.5 million in April 2020 in connection with the agreement.

●

~~Vir Biotechnology, Inc.~~: In August 2019 we provided VirBio a non-exclusive license to use our Xtend Fc technology in developing and commercializing antibodies as potential treatments for patients with influenza and hepatitis B virus infection. One of these antibodies, VIR-2482, is being evaluated as a universal prophylactic for influenza A in an ongoing Phase 1 study.

~~In March 2020, we~~Xencor previously entered into a ~~second~~technology license agreement with Vir, pursuant to which Vir has non-exclusive ~~license with VirBio~~access to multiple Xencor Fc technologies, including Xtend™ Fc technology, designed to extend the half-life of novel antibodies that ~~VirBio~~Vir is investigating as potential treatments for patients with COVID-19. Under the terms of the agreement, Vir is solely responsible for the activities and costs related to research, development, regulatory and commercial activities for their COVID-19 drug candidates, and Xencor is eligible to receive royalties on net sales in the ~~disease caused by~~mid-single digit percent range. Vir and its partner GlaxoSmithKline plc (GSK) are evaluating VIR-7831 in an extensive ongoing clinical development program. In March 2021, Vir and GSK submitted an EUA application to the ~~novel coronavirus SARS-CoV-2. VirBio plans~~FDA based on an interim analysis of the Phase 3 COMET-ICE (COVID-19 Monoclonal antibody Efficacy Trial - Intent to ~~proceed directly~~Care Early) trial, which demonstrated an 85% reduction in hospitalization or death in high-risk adult outpatients COVID-19 patients receiving VIR-7831 as monotherapy compared to placebo, the primary endpoint of the trial.

In February 2021, we amended the Vir licensing agreements to include a non-exclusive license to our XmAb Cytotoxic Fc Domain. If Vir incorporates both Xtend and Cytotoxic Fc Domains into their drug candidates, we are eligible for an increase in the royalty rates, in the mid-single digit percent range.

Refer to Part I, Item 1, Note 9, Collaboration and Licensing Agreements of the Notes to Financial Statements included in this Quarterly Report on Form 10-Q for a ~~Phase 2 study within~~description of the ~~coming months.~~key terms of our arrangements.

We have over 1,000 issued and pending patents worldwide to protect our XmAb technology platform and XmAb drug candidates.

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Since we commenced active operations in 1998, we have devoted substantially all our resources to staffing our ~~company,~~Company, business planning, raising capital, developing our technology platforms, identifying potential product candidates, undertaking pre-clinical and IND-enabling studies, and conducting clinical trials. We have no products approved for commercial sale and have not generated any revenues from product sales, and we continue to incur significant research and development expenses and other expenses related to our ongoing operations. To date, we have funded our operations primarily through the sale of stock and from payments generated from our product development partnerships and licensing arrangements.

As of March 31, ~~2020,~~2021, we had an accumulated deficit of ~~$304.5~~$368.2 million. Substantially all of the operating losses that we have incurred resulted from expenses incurred in connection with our product candidate development programs, our research activities and general and administrative costs associated with our operations.

Results of Operations

Comparison of the Three Months Ended March 31, ~~2020~~2021 and ~~2019~~2020

The following table summarizes our results of operations for the three months ended March 31, ~~2020~~2021 and ~~2019~~2020 (in millions):

Three Months Ended

Three Months Ended

March 31,

March 31,


2020

2019

Change


2021

2020

Change

Revenues:

Research collaboration

$
1.0

$
0.3

$
0.7

$
14.8

$
1.0

$
13.8

Milestone

12.5

—

12.5

12.5

12.5

—

Licensing

15.6

111.7

(96.1)

—

15.6

(15.6)

Royalties

3.3

—

3.3

6.7

3.3

3.4

Total revenues

32.4

112.0

(79.6)

34.0

32.4

1.6

Operating expenses:

Research and development

34.0

28.2

5.8

41.4

34.0

7.4

General and administrative

7.2

5.5

1.7

8.2

7.2

1.0

Total operating expenses

41.2

33.7

7.5

49.6

41.2

8.4

Other income, net

0.7

2.7

(2.0)

13.1

0.7

12.4

Income (loss) before income tax expense

(8.1)

81.0

(89.1)

Income tax expense

—

0.9

(0.9)

Net income (loss)

$
(8.1)

$
80.1

$
(88.2)

Net loss

$
(2.5)

$
(8.1)

$
5.6

Revenues

Revenues for the three months ended March 31, 2021 are primarily from the collaboration with Janssen, milestone revenue recognized from MorphoSys, and the royalty revenue from Alexion and MorphoSys. Revenues for the three months ended March 31, 2020 are primarily from milestone ~~revenue~~revenues recognized from ~~the~~our MorphoSys collaboration, royalty revenue from our Alexion collaboration, and licensing revenue recognized from the collaborations with Aimmune and Gilead. ~~Revenue recognized for the three months ended March 31, 2019 is primarily from our licensing revenue from the Genentech collaboration.~~

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Research and Development Expenses

The following ~~table summarizes~~tables summarize our research and development expenses for the three months ended March 31, ~~2020~~2021 and ~~2019~~2020 (in millions):

Three Months Ended

March 31,


2020

2019

Change
Product programs:

Obexelimab (XmAb5871)

$
1.0

$
6.6

$
(5.6)

Bispecific programs:

CD3 programs:

Vibecotamab (XmAb14045)*

2.7

2.7

—
Plamotamab (XmAb13676)

7.0

1.9

5.1
Tidutamab (XmAb18087)

3.2

2.7

0.5
Total CD3 programs

12.9

7.3

5.6

Tumor micro environment (TME) activators:

XmAb20717

5.3

2.7

2.6
XmAb23104

2.7

1.9

0.8
XmAb22841

2.5

1.6

0.9
Total TME activators

10.5

6.2

4.3

Cytokine programs:

XmAb24306*

2.0

4.8

(2.8)
XmAb27564

1.9

0.1

1.8
Total cytokine programs

3.9

4.9

(1.0)

Subtotal bispecific programs

27.3

18.4

8.9

Other, research and early stage programs

5.7

3.2

2.5

Total research and development expenses

$
34.0

$
28.2

$
5.8

Three Months Ended

March 31,


2021

2020

Change
Product programs:

Obexelimab (XmAb5871)

$
0.6

$
1.0

$
(0.4)

Bispecific programs:

CD3 programs:

Vibecotamab*

2.9

2.7

0.2
Plamotamab

6.7

7.0

(0.3)
Tidutamab

4.3

3.2

1.1
XmAb819 (ENPP3 x CD3)

3.0

1.1

1.9
Total CD3 programs

16.9

14.0

2.9

Tumor micro environment (TME) activator programs:

XmAb717

5.9

5.3

0.6
XmAb104

2.5

2.7

(0.2)
XmAb841

3.1

2.5

0.6
Total TME activators programs

11.5

10.5

1.0

Cytokine programs:

XmAb306/RG6323 and second IL-15 candidate*

3.9

2.0

1.9
XmAb564

3.2

1.9

1.3
Total cytokine programs

7.1

3.9

3.2

Subtotal bispecific programs

35.5

28.4

7.1

Other, research and early stage programs

5.3

4.6

0.7

Total research and development expenses

$
41.4

$
34.0

$
7.4

*Includes net payments to, and reimbursements from our partners pursuant to agreements that include cost-sharing arrangements.

Three Months Ended

March 31,


2021

2020

Change
External research and development expenses

$
20.8

$
17.2

$
3.6
Internal research and development expenses

15.0

12.6

2.4
Stock based compensation

5.6

4.2

1.4
Total research and development expenses

$
41.4

$
34.0

$
7.4

Research and development expenses increased by ~~$5.8~~$7.4 million for the three months ended March 31, ~~2020~~2021 over the same period in ~~2019~~2020 primarily due to increased spending on our ~~plamotamab~~XmAb306, XmAb564, and XmAb20717 programs as we continue to advance these programs in dose escalation clinical studies. Spending also increased on our XmAb27564 program as we advance it into IND enabling studies and activities and in our earlier research stage studies. These increases were partially offset by reduced spending on our obexelimab program.XmAb819 programs.

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General and Administrative Expenses

The following table summarizes our general and administrative expenses for the three months ended March 31, ~~2020~~2021 and ~~2019~~2020 (in millions):

Three Months Ended

Three Months Ended

March 31,

March 31,


2020

2019

Change


2021

2020

Change

General and administrative

$
7.2

$
5.5

$
1.7

$
8.2

$
7.2

$
1.0

General and administrative expenses increased by ~~$1.7~~$1.0 million for the three months ended March 31, ~~2020~~2021 over the same period in ~~2019~~2020 primarily due to increased ~~spending related to personnel~~general and ~~professional fees.~~administrative staffing.

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Other Income, Net

Other income was ~~$0.7~~$13.2 million and ~~$2.7~~$0.7 million for the three months ended March 31, ~~2020~~2021 and ~~2019,~~2020, respectively. The ~~decrease~~increase in other income was primarily due to unrealized gain recognized with respect to the shares of Catabasis that we received from ~~the loss recognized from our equity securities.~~its merger with Quellis.

Cash Flows

The following table sets forth the primary sources and uses of cash for each of the periods presented below (in thousands):

Three Months Ended

Three Months Ended

March 31,

March 31,


2020

2019

Change

2021

2020

Change
Net cash (used in) provided by:

Net cash provided by (used in):

Operating activities

$
9,460

$
(18,728)

$
28,188

$
(29,966)

$
9,460

$
(39,426)
Investing activities

12,565

13,673

(1,108)

38,048

12,565

25,483
Financing activities

1,471

667

804

5,339

1,471

3,868
Net increase in cash

$
23,496

$
(4,388)

$
27,884

$
13,421

$
23,496

$
(10,075)

Operating Activities

Cash used in operating activities for the three months ended March 31, 2021 was $30.0 million while cash provided by operating activities for the three months ended March 31, 2020 ~~increased by $28.2 million over amounts reported for the three months ended March 31, 2019~~was $9.5 million. The increase in cash used in operating activities is primarily due to ~~upfront~~increased research and ~~milestone payments received from collaborations in the three-month period ended March 31, 2020.~~development expenses.

Investing Activities

Investing activities consist primarily of investments in marketable securities available-for-sale, purchases of intangible assets, capitalization of patent and licensing costs and purchases of property and equipment.

Financing Activities

Net cash provided by financing activities for the three months ended March 31, ~~2020~~2021 increased by ~~$0.8~~$3.9 million over the same period in ~~2019~~2020, which reflects additional proceeds received from the exercise of stock options.

Liquidity and Capital Resources

We have financed our operations primarily through private placements of our equity ~~and~~securities, the issuance of convertible notes, ~~the~~ public offerings of our common stock, and payments received under our product development partnerships and licensing arrangements.

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As of March 31, ~~2020,~~2021, we had ~~$609.9~~$577.1 million of cash, cash equivalents and marketable investment securities compared to ~~$601.3~~$604.0 million atas of December 31, ~~2019.~~2020. The investments in marketable securities are further described above in ~~footnote~~Note 5, ~~in the~~Marketable and Equity Securities, of Notes to Financial Statements included in ~~Item 1 of Part I of~~ this Quarterly Report on Form 10-Q. We expect to continue to receive additional payments from our collaborators for research and development services rendered, additional milestone, opt-in, contingent payments and royalties. Our ability to receive milestone payments and contingent payments from our partners is dependent upon either our ability or our partners’ abilities to achieve certain levels of research and development activities and is therefore uncertain at this time.

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Funding Requirements

We have not generated any revenue from product sales to date and do not expect to do so until we obtain regulatory approval of and commercialize one or more of our product candidates. As we are currently in the clinical stage of development, it will be some time before we expect to achieve this, and it is uncertain that we ever will commercialize one or more of our product candidates. We expect that we will continue to increase our operating expenses in connection with ongoing as well as additional clinical and ~~pre-clinical~~preclinical development of product candidates in our pipeline.

Although it is difficult to predict our funding requirements, based upon our current operating plan, we expect that our existing cash, cash equivalents, ~~and~~ marketable securities, and certain potential milestone payments will fund our operating expenses and capital expenditure requirements into 2024. We have based these estimates on assumptions that may prove to be wrong, and the COVID-19 pandemic could materially alter these estimates which would cause us to use our capital resources sooner than we currently expect.

Off-Balance Sheet Arrangements

We did not have during the periods presented, and we do not currently have, any off-balance sheet arrangements.

Contractual Obligations and Commitments

There were no material changes outside of the ordinary course of business to our specific contractual obligations during the three months ended March 31, ~~2020.~~2021.

Critical Accounting Policies

For a discussion onof our material changes in critical accounting policies, see “Recent Accounting Pronouncements” in Note 1, Summary of Significant Accounting Policies, of the ~~notes~~Notes to ~~the financial statements~~Financial Statements included in this Quarterly Report on Form 10-Q.

ITEM 3. Quantitative and Qualitative Disclosures about Market Risk

~~Our primary exposure to market risk is interest rate sensitivity, which is affected by~~There have been no material changes in the ~~general level of U.S. interest rates. Due to the short-term maturities~~quantitative or qualitative aspects of our ~~cash equivalents~~market risk profile. For additional information regarding the Company’s exposure to certain market risks, see “Item 7A. Quantitative and marketable securities and the low risk profile of our investments, an immediate 10% decrease in interest rates would not have a material effect on the fair market value of our portfolio. In connection with the COVID-19 pandemic the financial markets were materially affected and all classes of public corporate debt were subject to increased risk. We are closely monitoring the changesQualitative Disclosures About Market Risk” included in the ~~market with our financial advisors and are adjusting our investment holdings in connection with~~Form 10-K for the ~~risk caused by the COVID-19 pandemic.~~

We do not believe that our cash and cash equivalents have significant risk of default or illiquidity. While we believe our cash and cash equivalents do not contain excessive risk, we cannot provide absolute assurance that in the future our investments will not be subject to adverse changes in market value. In addition, we maintain significant amounts of cash and cash equivalents at one or more financial institutions that are in excess of federally insured limits.

Inflation generally affects us by increasing our cost of labor and clinical trial costs. We do not believe that inflation has had a material effect on our results of operations during the periods presented.fiscal year ended December 31, 2020.

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ITEM 4. Controls and Procedures

Disclosure Controls and Procedures

As required by Rule 13a-15(b) and Rule 15d-15(b) of the Exchange Act, our management, with the supervision of our Chief Executive Officer and Chief Financial Officer (our principal executive officer and principal financial officer, respectively), evaluated the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Exchange Act Rule 13a-15(b) and 15d-15(e)) as of March 31, ~~2020.~~2021. Our disclosure controls and procedures are designed to provide reasonable assurance that the information required to be disclosed in this Quarterly Report on Form 10-Q has been appropriately recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission's rules and forms, and that such information is accumulated and communicated to our management, including our principal executive and principal financial officers, to allow timely decisions regarding required disclosure. Based on that evaluation, our principal executive and principal financial officers have concluded that our disclosure controls and procedures are effective at the reasonable assurance level as of March 31, ~~2020.~~2021.

A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues, if any, within a company have been detected. Accordingly, our disclosure controls and procedures are designed to provide reasonable assurance, not absolute assurance, that the objectives of our disclosure control system are met and, as set forth above, our principal executive officer and principal financial officer have concluded, that based on their evaluation as of the end of the period covered by this Quarterly Report on Form 10-Q, our disclosure controls and procedures were effective to provide reasonable assurance that the objective of our disclosure control system were met.

Changes in Internal Control

There were no changes in our internal control over financial reporting that occurred during the three months ended March 31, ~~2020~~2021 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting. Beginning March 17, 2020, a majority of our business, accounting and financial reporting employees began working remotely due to the COVID-19 pandemic. Since that time, we have not experienced any material impact to our internal controls over financial reporting. We are continually monitoring and assessing the COVID-19 situation on our internal controls to minimize the impact to their design and operating effectiveness.

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PART II — OTHER INFORMATION

ITEM 1. Legal Proceedings.

~~None.~~The disclosure in Note 8, Commitments and Contingencies, of the Notes to Financial Statements included in this Quarterly Report on Form 10-Q includes a discussion of our legal proceedings and is incorporated herein by reference.

ITEM 1A. Risk Factors

You should carefully consider the factors discussed in Part 1,I, “Item 1A. Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, ~~2019,~~2020, which could materially affect our business, financial position, or future results of operations. See also “Special Note Regarding Forward-Looking Statements” included in this Quarterly Report on Form 10-Q. In addition to the risks set forth in our Annual Report on Form 10-K for the year ended December 31, ~~2019,~~2020, additional risks and uncertainties not currently known to us or that we currently deem to be immaterial may also materially and adversely affect our business. In light of the rapid spread of SARS-CoV-2, which causes coronavirus disease 2019 (COVID-19), we are updating and supplementing our risk factors described in our Annual Report on Form 10-K for the year ended December 31, 2019 to include the following new risk factor.

~~Risks Relating To Our Business and to the Discovery, Development, Regulatory Approval of Our Product Candidates and other Legal Compliance Matters~~

The COVID-19 pandemic and the future outbreak of other highly infectious or contagious diseases, could materially and adversely impact or disrupt our business and our financial condition, results of operations, cash flows and performance.

On March 11, 2020, the World Health Organization (WHO) declared the rapid spread of COVID-19 a global pandemic, and on March 19, the Governor of the State of California, where we are headquartered and where our principal place of business is located, implemented a mandatory stay at home order for residents working in non-critical businesses.

An epidemic or pandemic disease outbreak, including the COVID-19 pandemic, could cause significant disruptions to our business operations, business operations of our partners, on whom we rely for potential revenue, and product development collaborations; operations of our third-party manufacturers and contract research organizations (CROs), on which we rely to conduct our clinical trials; and to our clinical trials, including as a result of significant restrictions or bans on travel into and within the countries in which our manufacturers produce our product candidates or where we conduct our clinical trials. Such disruptions could impede, delay, limit or prevent our employees and CROs from continuing research and development activities.

The COVID-19 pandemic could adversely affect our and our partners’ ability to enroll and recruit patients in current and future clinical trials. Our success is dependent on our ability and the ability of our partners to advance our wholly-owned and partnered development programs into later stages of clinical development. Many pharmaceutical and biotechnology companies have indicated that their clinical trials will be delayed and enrollment of current and ongoing trials will suffer as a result of the COVID-19 pandemic. Completion of our ongoing clinical and preclinical studies or commencement of new clinical trials could be impeded, delayed, limited or prevented by the effects of the COVID-19 pandemic and related restrictions including negative effects on the production, delivery or release of our product candidates to our clinical trial sites, as participation by our clinical trial investigators, patients or other critical staff, which to could delay data collection, analysis and other related activities, any of which could cause delay or denial of regulatory approval of our product candidates. The delay and impact on enrollment cannot be determined at this time and will depend on the length and severity of the COVID-19 pandemic. Continued delays on our clinical and preclinical studies or trials will increase our costs and expenses and seriously harm our operations and financial condition, which will adversely affect our business.

The COVID-19 pandemic could also potentially affect the business of the FDA as well as other health regulatory authorities, which could result in delays in our communications with these authorities and ultimately in our ability for us and our partners to have drug products approved.

~~Table of Contents~~

The COVID-19 pandemic and mitigation measures also have had and may continue to have an adverse impact on global economic conditions which could have an adverse effect on our business and financial condition, including impairment of our ability to raise capital when needed. The trading prices for biopharmaceutical companies’ stock, including our common shares have been highly volatile as a result of the COVID-19 pandemic. In addition, a recession, depression or other sustained adverse market event resulting from the COVID-19 pandemic could materially ~~and adversely affect our business and the value of our common shares.~~

The COVID-19 pandemic could potentially affect our partnerships and collaborations which provide us with revenue and non-dilutive payments in the form of upfront payments, milestone payments, royalties and cost-sharing of co-development programs. If our partners’ and collaborators’ operations are severely affected by the COVID-19 pandemic, it will adversely affect our future potential revenue from such partners and collaborators.

We have required most of our employees, including all of our administrative employees, to work remotely, restricted on-site staff to only those employees that must perform essential activities that must be completed on-site and limited the number of staff allowed in our laboratory and offices. These changes may negatively impact productivity, or disrupt, delay, or otherwise adversely impact our business. In addition, this could increase our cyber security risk, create data accessibility concerns, and make us more susceptible to communication disruptions, any of which could adversely impact our business operations. When we reopen our facilities, we could encounter delays in connection with implementing precautionary measures to mitigate the risk of exposing our facilities and employees to COVID-19.

The COVID-19 pandemic could adversely affect our supply chain for our research, development and clinical programs. We rely on third party vendors for research supplies, development activities including manufacturing of drug product for our clinical studies and testing of drug material. If any of the vendors in our supply chain of products or services are severely affected from the COVID-19 pandemic, it will adversely affect our ability to continue our research and development activities and also continue our clinical trial activities.

The COVID-19 pandemic continues to rapidly evolve. Its ultimate impact on our business operations is highly uncertain and subject to change that will depend on future developments, which cannot be accurately predicted, including the duration of the COVID-19 pandemic, additional or modified government actions, new information that will emerge concerning the severity and impact of COVID-19 and the actions taken to address its impact in the short and long term, among others. We do not yet know the full extent of potential delays or impacts on our business, our clinical trials, our research programs, healthcare systems or the global economy. We will continue to monitor the situation closely.

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ITEM 6. Exhibits

Exhibit

Number

Description of Document
3.1

Amended and Restated Certificate of Incorporation of the Company (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K, filed with the SEC on December 11, 2013).

3.2

Amended and Restated Bylaws of the Company (incorporated by reference to Exhibit 3.2 to the Company’s Current Report on Form 8-K, filed with the SEC on December 11, 2013).

4.1

Form of Common Stock Certificate of the Company (incorporated by reference to Exhibit 4.1 to the Company’s Registration Statement on Form S-1, as amended (File No. 333-191689), originally filed with the SEC on October 25, 2013).

4.2

Third Amended and Restated Investor Rights Agreement, dated June 26, 2013, among the Company and certain of its stockholders incorporated by reference to Exhibit 4.2 to the Company’s Registration Statement on Form S-1, as amended (File No. 333-191689), originally filed with the SEC on October 11, 2013).

10.1

First Amendment to the Collaboration and License Agreement, dated March 10, 2021, by and between the Company and Genentech, Inc. and F. Hoffmann-La Roche LTD.

10.2*

Form of Restricted Stock Unit Agreement (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K, filed with the SEC on March 10, 2021).

31.1

Rule 13a-14(a) Certification of Principal Executive Officer.

31.2

Rule 13a-14(a) Certification of Principal Financial Officer.

32.1

Section 1350 Certification of Principal Executive Officer and Principal Financial Officer.

101.INS

Inline XBRL Instance Document – The instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the inline XBRL document.

101.SCH

Inline XBRL Schema Document

101.CAL

Inline XBRL Calculation Linkbase Document

101.DEF

Inline XBRL Definition Linkbase Document

101.LAB

Inline XBRL Labels Linkbase Document

101.PRE

Inline XBRL Presentation Linkbase Document

104

104 Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

*

~~Indicates management contract or compensatory plan~~
* Indicates management contract or compensatory plan.

3738

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

XENCOR, INC.

BY:
/s/ BASSIL I. DAHIYAT

Bassil I. Dahiyat, Ph.D.

President and Chief Executive Officer

(Principal Executive Officer)

BY:
/s/ JOHN J. KUCH

John J. Kuch

Chief Financial Officer

(Principal Financial Officer)

Dated: May ~~7, 2020~~5, 2021

3839


Exhibit
Number		Description of Document
3.1		Amended and Restated Certificate of Incorporation of the Company (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K, filed with the SEC on December 11, 2013).

3.2		Amended and Restated Bylaws of the Company (incorporated by reference to Exhibit 3.2 to the Company’s Current Report on Form 8-K, filed with the SEC on December 11, 2013).

4.1		Form of Common Stock Certificate of the Company (incorporated by reference to Exhibit 4.1 to the Company’s Registration Statement on Form S-1, as amended (File No. 333-191689), originally filed with the SEC on October 25, 2013).

4.2		Third Amended and Restated Investor Rights Agreement, dated June 26, 2013, among the Company and certain of its stockholders incorporated by reference to Exhibit 4.2 to the Company’s Registration Statement on Form S-1, as amended (File No. 333-191689), originally filed with the SEC on October 11, 2013).
10.1		First Amendment to the Collaboration and License Agreement, dated March 10, 2021, by and between the Company and Genentech, Inc. and F. Hoffmann-La Roche LTD.

10.2*		Form of Restricted Stock Unit Agreement (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K, filed with the SEC on March 10, 2021).

31.1		Rule 13a-14(a) Certification of Principal Executive Officer.

31.2		Rule 13a-14(a) Certification of Principal Financial Officer.

32.1		Section 1350 Certification of Principal Executive Officer and Principal Financial Officer.

101.INS		Inline XBRL Instance Document – The instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the inline XBRL document.

101.SCH		Inline XBRL Schema Document

101.CAL		Inline XBRL Calculation Linkbase Document

101.DEF		Inline XBRL Definition Linkbase Document

101.LAB		Inline XBRL Labels Linkbase Document

101.PRE		Inline XBRL Presentation Linkbase Document
104		104 Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)
*		~~Indicates management contract or compensatory plan~~


	XENCOR, INC.

	BY:	/s/ BASSIL I. DAHIYAT
		Bassil I. Dahiyat, Ph.D.
		President and Chief Executive Officer
		(Principal Executive Officer)

	BY:	/s/ JOHN J. KUCH
		John J. Kuch
		Chief Financial Officer
		(Principal Financial Officer)

Dated: May ~~7, 2020~~5, 2021