10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.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 September 30, 2022

or

☐ 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 of registrant as specified in its charter)

Delaware	20-1622502
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
111 West Lemon Avenue, Monrovia, CA	91016
(Address of principal executive offices)	(Zip Code)

(626) 305-5900

(Registrant’s telephone number, including area code)

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

Title of each class:	Trading Symbol(s)	Name of each exchange on which registered:
Common Stock, par value $0.01 per share	XNCR	The 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 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 November 3, 2022
Common stock, par value $0.01 per share	59,924,016

Xencor, Inc.

Quarterly Report on Form 10-Q for the Quarter Ended September 30, 2022

Table of Contents

		Page
	SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS	3
PART I.	FINANCIAL INFORMATION	5
Item 1.	Financial Statements	5
	Balance Sheets as of September 30, 2022 (unaudited) and December 31, 2021	5
	Statements of Comprehensive Income (Loss) for the Three and Nine Months Ended September 30, 2022 and 2021 (unaudited)	6
	Statements of Stockholders’ Equity for the Three and Nine Months Ended September 30, 2022 and 2021 (unaudited)	7
	Statements of Cash Flows for the Nine Months Ended September 30, 2022 and 2021 (unaudited)	8
	Notes to Financial Statements (unaudited)	9
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	26
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	38
Item 4.	Controls and Procedures	39
PART II.	OTHER INFORMATION	40
Item 1.	Legal Proceedings	40
Item 1A.	Risk Factors	40
Item 6.	Exhibits	41
Signatures		42

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.

2

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the Securities Act), and Section 21E of the Securities Exchange Act of 1934, as amended (the Exchange Act). 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,” the negative of such terms or other words indicating future results.

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 in the United States and abroad 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, cost, and timing of our ongoing and planned clinical trials;

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

● our 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;

● the ability of our publicly announced preliminary clinical trial data to support continued clinical development and regulatory approval for specific treatments;

● 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;

● the potential loss or retirement of key members of management;

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

3

● our failure to maintain effective internal controls.

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, 2021 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.

4

PART I — FINANCIAL INFORMATION

ITEM 1.          Financial Statements

Xencor, Inc.

Balance Sheets

(in thousands, except share and per share data)

	September 30,		December 31,
	2022		2021
	(unaudited)
Assets
Current assets
Cash and cash equivalents	$	52,654	$	143,480
Marketable debt securities		515,398		153,767
Marketable equity securities		32,184		36,860
Accounts receivable		44,876		66,384
Prepaid expenses		22,886		23,877
Total current assets		667,998		424,368
Property and equipment, net		51,040		28,240
Patents, licenses, and other intangible assets, net		18,094		16,493
Marketable debt securities - long term		41,720		300,465
Marketable equity securities - long term		31,124		31,262
Notes receivable - long term		5,000		5,000
Right of use (ROU) asset		19,680		31,730
Other assets		613		653
Total assets	$	835,269	$	838,211
Liabilities and stockholders’ equity
Current liabilities
Accounts payable	$	14,618	$	14,001
Accrued expenses		19,289		19,443
Lease liabilities		20,551		—
Deferred revenue		35,186		37,294
Income tax payable		388		—
Total current liabilities		90,032		70,738
Lease liabilities, net of current portion		22,539		33,969
Total liabilities		112,571		104,707
Commitments and contingencies
Stockholders’ equity
Preferred stock, $0.01 par value: 10,000,000 authorized shares; -0- issued and outstanding shares at September 30, 2022 and December 31, 2021		—		—
Common stock, $0.01 par value: 200,000,000 authorized shares at September 30, 2022 and December 31, 2021; 59,773,337 issued and outstanding at September 30, 2022 and 59,355,558 issued and outstanding at December 31, 2021		598		595
Additional paid-in capital		1,058,219		1,017,523
Accumulated other comprehensive loss		(9,875)		(1,510)
Accumulated deficit		(326,244)		(283,104)
Total stockholders’ equity		722,698		733,504
Total liabilities and stockholders’ equity	$	835,269	$	838,211

See accompanying notes.

5

Xencor, Inc.

Statements of Comprehensive Income (Loss)

(unaudited)

(in thousands, except share and per share data)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Revenue
Collaborations, milestones, and royalties	$	27,299	$	19,683	$	142,969	$	121,096
Operating expenses
Research and development		53,273		50,610		148,111		141,519
General and administrative		12,374		10,373		34,738		27,462
Total operating expenses		65,647		60,983		182,849		168,981
Loss from operations		(38,348)		(41,300)		(39,880)		(47,885)
Other income (expenses)
Interest income, net		1,379		196		2,749		558
Other expense, net		(1)		(593)		(244)		(610)
Gain (loss) on equity securities, net		5,299		1,506		(4,676)		57,507
Total other income (expense), net		6,677		1,109		(2,171)		57,455
Income (loss) before income tax expense		(31,671)		(40,191)		(42,051)		9,570
Income tax expense		1,088		—		1,088		—
Net income (loss)		(32,759)		(40,191)		(43,139)		9,570
Other comprehensive loss
Net unrealized loss on marketable debt securities		(931)		(59)		(8,366)		(149)
Comprehensive income (loss)	$	(33,690)	$	(40,250)	$	(51,505)	$	9,421
Basic net income (loss) per common share	$	(0.55)	$	(0.69)	$	(0.72)	$	0.16
Diluted net income (loss) per common share	$	(0.55)	$	(0.69)	$	(0.72)	$	0.16
Basic weighted average common shares outstanding		59,716,594		58,350,647		59,564,985		58,199,928
Diluted weighted average common shares outstanding		59,716,594		58,350,647		59,564,985		60,346,480

See accompanying notes.

6

Xencor, Inc.

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, 2021	59,355,558	$	595	$	1,017,523	$	(1,510)	$	(283,104)		$	733,504
Issuance of common stock upon exercise of stock awards	36,500		—		731		—		—			731
Issuance of restricted stock units	137,134		1		(1)		—		—			—
Comprehensive income (loss)	—		—		—		(5,611)		23,594			17,983
Stock-based compensation	—		—		10,805		—		—			10,805
Balance, March 31, 2022 (unaudited)	59,529,192	$	596	$	1,029,058	$	(7,121)	$	(259,510)		$	763,023
Issuance of common stock upon exercise of stock awards	70,874		1		1,315		—		—			1,316
Issuance of restricted stock units	15,774		—		—		—		—			—
Issuance of common stock under the Employee Stock Purchase Plan	68,580		1		1,196		—		—			1,197
Comprehensive loss	—		—		—		(1,823)		(33,975)			(35,798)
Stock-based compensation	—		—		12,603		—		—			12,603
Balance, June 30, 2022	59,684,420		598		1,044,172		(8,944)		(293,485)			742,341
Issuance of common stock upon exercise of stock awards	71,530		—		1,287		—		—			1,287
Issuance of restricted stock units	17,387		—		—		—		—			—
Comprehensive loss	—		—		—		(931)		(32,759)			(33,690)
Stock-based compensation	—		—		12,760		—		—			12,760
Balance, September 30, 2022 (unaudited)	59,773,337	$	598	$	1,058,219	$	(9,875)	$	(326,244)		$	722,698
						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 (unaudited)	58,221,953	$	583	$	951,154	$	97	$	(368,222)	$		583,612
Issuance of common stock upon exercise of stock awards	52,790		1		902		—		—			903
Issuance of restricted stock units	10,190		—		—		—		—			—
Issuance of common stock under the Employee Stock Purchase Plan	30,552		—		937		—		—			937
Comprehensive income (loss)	—		—		—		(112)		52,248			52,136
Stock-based compensation	—		—		9,350		—		—			9,350
Balance, June 30, 2021	58,315,485		584		962,343		(15)		(315,974)			646,938
Issuance of common stock upon exercise of stock awards	132,709		1		3,228		—		—			3,229
Issuance of restricted stock units	6,617		—		—		—		—			—
Comprehensive loss	—		—		—		(59)		(40,191)			(40,250)
Stock-based compensation	—		—		8,943		—		—			8,943
Balance, September 30, 2021 (unaudited)	58,454,811	$	585	$	974,514	$	(74)	$	(356,165)		$	618,860

See accompanying notes.

7

Xencor, Inc.

Statements of Cash Flows

(unaudited)

(in thousands)

	Nine Months Ended
	September 30,
	2022		2021
Cash flows from operating activities
Net (loss) income	$	(43,139)	$	9,570
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation and amortization		6,640		5,384
Amortization of premium on marketable securities		909		2,632
Stock-based compensation		36,168		26,586
Abandonment of capitalized intangible assets		1,331		727
Equity received in connection with sale of financial assets		—		(3,300)
Change in fair value of equity securities		4,676		(39,206)
Impairment on equity securities		138		563
Loss on disposal of assets		132		17
Changes in operating assets and liabilities:
Accounts receivable and contract asset		21,508		3,398
Interest receivable from marketable debt securities		(392)		182
Prepaid expenses and other assets		1,031		(10,599)
Accounts payable		617		177
Accrued expenses		(154)		4,505
Income taxes		388		—
Lease liabilities and ROU assets		21,171		386
Deferred revenue		(2,108)		(79,665)
Net cash provided by (used in) operating activities		48,916		(78,643)
Cash flows from investing activities
Purchase of marketable debt securities		(317,058)		(387,826)
Purchase of equity securities		—		(842)
Proceeds from sale of property and equipment		—		4
Purchase of intangible assets		(3,977)		(2,348)
Purchase of property and equipment		(28,528)		(6,979)
Proceeds from maturities of marketable debt securities		205,290		343,882
Net cash used in investing activities		(144,273)		(54,109)
Cash flows from financing activities
Proceeds from issuance of common stock upon exercise of stock awards		3,334		9,471
Proceeds from issuance of common stock under the Employee Stock Purchase Plan		1,197		937
Net cash provided by financing activities		4,531		10,408
Net decrease in cash and cash equivalents		(90,826)		(122,344)
Cash and cash equivalents, beginning of period		143,480		163,544
Cash and cash equivalents, end of period	$	52,654	$	41,200
Supplemental disclosure of cash flow information
Cash paid during the period for:
Interest	$	13	$	13
Income taxes	$	72	$	—
Supplemental disclosures of non-cash investing activities
Unrealized loss on marketable debt securities	$	(8,366)	$	(149)

See accompanying notes.

8

Xencor, Inc.

Notes to Financial Statements

(unaudited)

September 30, 2022

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 2021 Annual Report on Form 10-K filed with the Securities and Exchange Commission (SEC) on February 24, 2022.

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, evaluation of intangible assets, investments, leases and other assets for evidence of impairment, fair value measurements, and contingencies. Significant estimates in these interim financial statements include estimates made for royalty revenue, accrued research and development expenses, stock-based compensation expenses, intangible assets, incremental borrowing rate for right-of-use asset and lease liability, estimated standalone selling price of performance obligations, estimated time for completing delivery of performance obligations under certain arrangements, the likelihood of recognizing variable consideration, the carrying value of equity instruments without a readily determinable fair value, 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 was no impairment charge recorded for the three and nine months ended September 30, 2022. During the three and nine months ended September 30, 2021, the Company recorded an impairment charge of $0.4 million related to an acquired license.

The Company capitalizes certain in-process intangible assets that are then abandoned when they are no longer pursued or used in current research activities. We abandoned $0.3 million and $1.3 million of in-process intangible assets during the three and nine months ended September 30, 2022, respectively. There was no material abandonment of in-process intangible assets during the three months ended September 30, 2021. We abandoned $0.3 million of in-process intangible assets during the nine months ended September 30, 2021.

9

Marketable Debt 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.

The Company considers its marketable debt securities to be available-for-sale because it is not more likely than not that the Company will be required to sell the securities before recovery of the amortized cost. These assets are carried at fair value and any impairment losses and recoveries related to the underlying issuer’s credit standing are recognized within other income (expense), while non-credit related impairment losses and recoveries are recognized within accumulated other comprehensive income (loss). There were no impairment losses or recoveries recorded for the three and nine months ended September 30, 2022 and 2021. Accrued interest on marketable debt securities is included in the 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. During the three and nine months ended September 30, 2022, the Company recorded an unrealized loss of $0.9 million and $8.4 million, respectively, in its portfolio of marketable debt securities. The unrealized losses are due to the changing interest rate environment and are not due to changes in the credit quality of the underlying securities. The unrealized losses are recorded in other comprehensive income (loss) for the three and nine months ended September 30, 2022.

The Company receives equity securities in connection with certain licensing transactions with its partners. These investments in equity securities 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 gain or loss on the sale of the securities will be recognized within other income (expense) in the Statements of Comprehensive Income (Loss) in the period of sale.

The Company also has investments in equity securities without a readily determinable fair value, where the Company elects the measurement alternative to record the investment 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. There was no impairment charge recorded for the three months ended September 30, 2022. During the nine months ended September 30, 2022, the Company recorded an impairment charge of $0.1 million in connection with equity securities without a readily determinable fair value. During the three and nine months ended September 30, 2021, the Company recorded an impairment charge of $0.6 million.

Recent Accounting Pronouncements

Pronouncements Not Yet Effective

In June 2022, the Financial Accounting Standards Board (FASB) issued ASU No. 2022-03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions, which is effective for fiscal years beginning on and after December 15, 2023, and interim periods within those fiscal years. The standard clarifies that a contractual restriction on the sale of an equity security is not considered part of the unit of account of the equity security and is not considered in measuring fair value. The Company does not anticipate that the standard will have a significant impact on its financial statements.

There have been no other material changes to the significant accounting policies previously disclosed in the Company’s 2021 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 and equity securities, accounts receivable, accounts payable, and accrued expenses. Marketable debt securities, equity 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 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 is determined by using unadjusted quoted prices that are available in active markets for identical assets or liabilities.

Level 2—Fair 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):

	September 30, 2022
	(unaudited)						December 31, 2021
	Total						Total
	Fair Value		Level 1		Level 2		Fair Value		Level 1		Level 2
Money Market Funds	$	24,506	$	24,506	$	—	$	123,892	$	123,892	$	—
Corporate Securities		186,597		—		186,597		144,418		—		144,418
Government Securities		370,521		—		370,521		309,814		—		309,814
	$	581,624	$	24,506	$	557,118	$	578,124	$	123,892	$	454,232

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 and nine months ended September 30, 2022 and 2021, there were no transfers between Level 1 and Level 2.

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3. Net Income (Loss) Per Common Share

Basic net income (loss) per common share is computed by dividing the net income (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) per common share is computed by dividing the net income (loss) attributable to common stockholders by the weighted-average number of common stock equivalents outstanding for the period. Potentially dilutive securities consisting of stock issuable pursuant to outstanding options and restricted stock units (RSUs), and stock issuable pursuant to the 2013 Employee Stock Purchase Plan (ESPP) are not included in the per common share calculation in periods when the inclusion of such shares would have an anti-dilutive effect.

Basic and diluted net income (loss) per common share is computed as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(in thousands, except share and per share data)				(in thousands, except share and per share data)
Numerator:
Net income (loss) attributable to common stockholders	$	(32,759)	$	(40,191)	$	(43,139)	$	9,570
Denominator:
Weighted-average common shares outstanding used in computing basic net income (loss)		59,716,594		58,350,647		59,564,985		58,199,928
Effect of dilutive securities		—		—		—		2,146,552
Weighted-average common shares outstanding used in computing diluted net income (loss)		59,716,594		58,350,647		59,564,985		60,346,480
Basic net income (loss) per common share	$	(0.55)	$	(0.69)	$	(0.72)	$	0.16
Diluted net income (loss) per common share	$	(0.55)	$	(0.69)	$	(0.72)	$	0.16

For the three and nine months ended September 30, 2022 and three months ended September 30, 2021, we excluded all shares of stock issuable pursuant to outstanding options and RSUs from the calculation, because the inclusion of such shares would have had an anti-dilutive effect. For the nine months ended September 30, 2021, we excluded 1,139,403 shares of stock issuable pursuant to outstanding options and RSUs from the calculation, because the inclusion of such shares would have had an anti-dilutive effect.

4. Comprehensive Income (Loss)

Comprehensive income (loss) is comprised of net income (loss) and other comprehensive income (loss). For each of the three- and nine-month periods ended September 30, 2022 and 2021, the only component of other comprehensive loss is net unrealized loss on marketable debt securities. There were no material reclassifications out of accumulated other comprehensive loss during each of the three- and nine-month periods ended September 30, 2022 and 2021.

12

5. Marketable Debt and Equity Securities

The Company’s marketable debt securities held as of September 30, 2022 and December 31, 2021 are summarized below:

			Gross		Gross
	Amortized		Unrealized		Unrealized
September 30, 2022	Cost		Gains		Losses		Fair Value
(in thousands)
Money Market Funds	$	24,506	$	—	$	—	$	24,506
Corporate Securities		188,360		—		(1,763)		186,597
Government Securities		378,623		—		(8,102)		370,521
	$	591,489	$	—	$	(9,865)	$	581,624
Reported as
Cash and cash equivalents							$	24,506
Marketable securities								557,118
Total investments							$	581,624
			Gross		Gross
	Amortized		Unrealized		Unrealized
December 31, 2021	Cost		Gains		Losses		Fair Value
(in thousands)
Money Market Funds	$	123,892	$	—	$	—	$	123,892
Corporate Securities		144,584		—		(166)		144,418
Government Securities		311,148		1		(1,335)		309,814
	$	579,624	$	1	$	(1,501)	$	578,124
Reported as
Cash and cash equivalents							$	123,892
Marketable securities								454,232
Total investments							$	578,124

The maturities of the Company’s marketable debt securities as of September 30, 2022 are as follows:

	Amortized		Estimated
September 30, 2022	Cost		Fair Value
(in thousands)
Mature in one year or less	$	523,629	$	515,398
Mature within two years		43,354		41,720
	$	566,983	$	557,118

13

The unrealized losses on available-for-sale investments and their related fair values as of September 30, 2022 and December 31, 2021 are as follows:

	Less than 12 months				12 months or greater
			Unrealized				Unrealized
September 30, 2022	Fair value		losses		Fair value		losses
(in thousands)
Corporate Securities	$	143,625	$	(1,649)	$	2,880	$	(114)
Government Securities		331,407		(6,582)		38,840		(1,520)
	$	475,032	$	(8,231)	$	41,720	$	(1,634)
	Less than 12 months				12 months or greater
			Unrealized				Unrealized
December 31, 2021	Fair value		losses		Fair value		losses
(in thousands)
Corporate Securities	$	50,337	$	(51)	$	45,872	$	(115)
Government Securities		39,909		(54)		254,593		(1,281)
	$	90,246	$	(105)	$	300,465	$	(1,396)

The unrealized losses from the available-for-sale securities are primarily due to changes in the interest rate environment and not changes in the credit quality of the underlying securities in the portfolio.

The Company’s equity securities include securities with a readily determinable fair value. These investments are carried at fair value with changes in fair value recognized each period and reported within other income (expense). For the three and nine months ended September 30, 2022, a gain of $5.3 million and a loss of $4.7 million, respectively, were recorded under other income (expense) related to these securities. Equity securities with a readily determinable fair value, which are categorized as Level 1 in the fair value hierarchy under ASC 820, and their fair values (in thousands) as of September 30, 2022 and December 31, 2021 are as follows:

	Fair Value		Fair Value
	September 30, 2022		December 31, 2021
Astria Common Stock	$	5,785	$	3,449
INmune Common Stock		11,690		19,233
Viridian Common Stock		14,709		14,178
	$	32,184	$	36,860

The Company also has investments in equity securities without a readily determinable fair value. The Company elects the measurement alternative to record these investments at their initial cost and evaluate such investments at each reporting period for evidence of impairment, or observable price changes in orderly transactions for the identical or a similar investment of the same issuer. Equity securities without a readily determinable fair value and their carrying values (in thousands) as of September 30, 2022 and December 31, 2021 are as follows:

	Carrying Value		Carrying Value
	September 30, 2022		December 31, 2021
Astria Preferred Stock	$	174	$	312
Zenas Preferred Stock		30,950		30,950
	$	31,124	$	31,262

14

In 2018, the Company received equity shares in Quellis Biosciences, Inc. (Quellis) in connection with a licensing transaction. In 2021, Quellis merged into Astria Therapeutics, Inc. (Astria) (formerly Catabasis Pharmaceuticals, Inc.), and the Company received common and preferred stock in Astria in exchange for its Quellis equity. The shares of Astria common stock have a readily determinable fair value. The adjustment in the fair value of the Astria common stock has been recorded as a gain in equity securities for the three and nine months ended September 30, 2022.

The Company records its investment in the shares of Astria preferred stock as an equity interest without a readily determinable fair value. The Company elected to record the shares of preferred stock at their initial cost and to review the carrying value for impairment or other changes in carrying value at each reporting period. During the nine months ended September 30, 2022, the Company recorded an impairment charge of $0.1 million related to its investment in Astria’s preferred stock.

The Company currently holds 1,885,533 shares of common stock of INmune Bio, Inc. (INmune). The 1,885,533 shares of INmune common stock are classified as equity securities with a readily determinable fair value, and the adjustment in the fair value of the shares of INmune common stock has been recorded as a loss in equity securities for the three and nine months ended September 30, 2022.

The Company currently holds 717,144 shares of common stock of Viridian Therapeutics, Inc. (Viridian). The shares of Viridian common stock are classified as equity securities with a readily determinable fair value, and the adjustment in the fair value of the shares of Viridian common stock was recorded as a gain in equity securities for the three and nine months ended September 30, 2022.

The Company currently holds an equity interest in Zenas BioPharma Limited (Zenas), a private biotechnology company. The Company’s equity interests include preferred stock in Zenas and a warrant to acquire additional equity in Zenas in a subsequent financing. The Company also holds a convertible promissory note from Zenas. The Company elected the measurement alternative to carry the Zenas equity and the warrant 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. During the three and nine months ended September 30, 2022, there has not been any impairment or observable price changes related to this investment.

Unrealized (loss) gain recognized on equity securities during each of the three- and nine-month periods ended September 30, 2022 and 2021, consist of the following:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Net gain (loss) recognized on equity securities	$	5,299	$	1,506	$	(4,676)	$	57,507
Less: net gain recognized on sale of equity securities		—		—		—		(18,301)
Unrealized gain (loss) recognized on equity securities	$	5,299	$	1,506	$	(4,676)	$	39,206

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 no 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.

15

As of September 30, 2022, the total number of shares of common stock available for issuance under the 2013 Plan is 14,974,396. 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 immediately preceding year. Pursuant to approval by the Board, the total number of shares of common stock available for issuance under the 2013 Plan was increased by 2,374,222 shares on January 1, 2022. As of September 30, 2022, a total of 14,407,906 options have been granted under the 2013 Plan.

In November 2013, the Board and our stockholders approved the ESPP, which became effective as of December 5, 2013. As of September 30, 2022, the total number of shares of common stock available for issuance under the ESPP is 576,409. 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 the Board, the total number of shares of common stock available for issuance under the ESPP was increased by 593,555 shares on January 1, 2022. As of September 30, 2022, we have issued a total of 598,432 shares of common stock under the ESPP.

During the nine months ended September 30, 2022, the Company awarded 809,630 RSUs to certain employees. The standard vesting of these awards is generally in three equal annual installments and is contingent on an employee’s 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 September 30, 2022, a total of 1,934,117 RSUs have been granted under the 2013 Plan.

Total employee, director and non-employee stock-based compensation expense recognized for the three months ended September 30, 2022 and 2021 are as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
General and administrative	$	4,736	$	3,370	$	12,760	$	9,300
Research and development		8,024		5,573		23,408		17,286
	$	12,760	$	8,943	$	36,168	$	26,586
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Stock options	$	7,833	$	6,959	$	22,178	$	20,844
ESPP		282		265		873		766
RSUs		4,645		1,719		13,117		4,976
	$	12,760	$	8,943	$	36,168	$	26,586

16

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, 2021	8,676,329	$	29.11		6.65	$	100,057
Options granted	2,007,833	$	29.58
Options forfeited	(440,882)	$	33.77
Options exercised	(178,904)	$	18.64
Balance at September 30, 2022	10,064,376	$	29.18		6.51	$	27,085
Exercisable	6,401,896	$	26.57		5.21	$	26,936

We calculate the intrinsic value as the difference between the exercise price of the options and the closing price of common stock of $25.98 per share as of September 30, 2022.

The weighted-average fair value of options granted during the nine-month periods ended September 30, 2022 and 2021 were $15.50 and $21.96 per share, respectively. There were 1,662,574 options granted during the nine-month period ended September 30, 2021. 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 and nine months ended September 30, 2022 and 2021:

	Options				Options
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Expected term (years)	6.1		6.0		6.3		6.2
Expected volatility	51.9	%	55.6	%	53.0	%	55.6	%
Risk-free interest rate	3.38	%	0.88	%	2.02	%	1.00	%
Expected dividend yield	—	%	—	%	—	%	—	%

	ESPP				ESPP
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Expected term (years)	0.5 - 2.0		0.5 - 2.0		0.5 - 2.0		0.5 - 2.0
Expected volatility	43.2 - 55.7	%	46.1 - 66.4	%	43.2 - 55.7	%	46.1 - 66.4	%
Risk-free interest rate	0.13 - 2.82	%	0.04 - 1.65	%	0.13 - 2.82	%	0.04 - 1.65	%
Expected dividend yield	—	%	—	%	—	%	—	%

As of September 30, 2022, the unamortized compensation expense related to unvested stock options was $59.1 million. The remaining unamortized compensation expense will be recognized over the next 2.5 years. As of September 30, 2022, the unamortized compensation expense under our ESPP was $1.4 million. The remaining unamortized expense will be recognized over the next 1.2 years.

17

The following table summarizes the RSU activity for the nine-month period ended September 30, 2022:

		Weighted
	Restricted	Average Grant
	Stock	Date Fair Value
	Units	(Per unit)
Unvested RSUs at December 31, 2021	826,148	$	37.79
Granted	809,630		29.61
Vested	(170,295)		37.42
Forfeited	(108,076)		33.65
Unvested RSUs at September 30, 2022	1,357,407	$	33.28

As of September 30, 2022, the unamortized compensation expense related to unvested RSUs was $32.0 million. The remaining unamortized expense will be recognized over the next 2.0 years.

7. Leases

The Company leases office and laboratory space in Monrovia, California under a lease that expires in December 2025 with an option to renew for an additional five years at then market rates. The Company has assessed that it is unlikely to exercise the option to extend the lease term. In July 2017, under a separate agreement, the Company entered into a lease for additional space in the same building with a lease that continues through September 2022. The lease contained an option to renew for additional lease term and the option period has lapsed. In October 2022, the Company entered into an amendment to extend the lease under existing terms through January 31, 2023. For the three and nine months ended September 30, 2022, ROU assets obtained in exchange for new operating lease liabilities are $0.3 million.

In June 2021, the Company entered into an Agreement of Lease (Lease Agreement) for laboratory and office space in Pasadena, California, which will expire in July 2035. The Lease Agreement provides for two separate phases of lease and occupancy. The first phase commences on August 1, 2022 and provides the Company with an improvement allowance up to $17.0 million. The second phase of the lease agreement will commence no later than September 30, 2026 and includes an additional improvement allowance up to $3.3 million. In August 2022, the Company entered into an amendment, which the Company would receive an additional $5.0 million in tenant improvement allowance in exchange for an increase in the rental rate of the phase 1 space. For the three and nine months ended September 30, 2022, ROU assets obtained in exchange for new operating lease liabilities are $11.4 million.

The Company leases additional office space in San Diego, California through August 2022. In May 2022, the Company extended the term of the lease through December 2023. For the nine months ended September 30, 2022, ROU assets obtained in exchange for new operating lease liabilities are $1.5 million.

The Company also leases additional office space in Monrovia, California under a lease that extends through January 2023, with an option to extend for an additional two years. The Company has assessed 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.

18

The following table reconciles the undiscounted cash flows for the operating leases at September 30, 2022 to the operating lease liabilities recorded on the balance sheet (in thousands):

Years ending December 31,
For the remainder of 2022	$	727
2023		7,251
2024		6,072
2025		6,176
2026		5,638
2027		5,791
Thereafter		49,407
Total undiscounted lease payments		81,062
Less: Tenant allowance		(3,489)
Less: Imputed interest		(34,483)
Present value of lease payments	$	43,090
Lease liabilities - short-term	$	20,551
Lease liabilities - long-term		22,539
Total lease liabilities	$	43,090

The following table summarizes lease costs and cash payments for the three and nine months ended September 30, 2022 and 2021 (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Operating lease cost	$	1,589	$	1,553	$	4,725	$	2,780
Variable lease cost		156		16		287		44
Total lease costs	$	1,745	$	1,569	$	5,012	$	2,824
Cash paid for amounts included in
the measurement of lease liabilities	$	564	$	1,034	$	1,913	$	2,081

As of September 30, 2022, the weighted-average remaining lease term for operating leases is 11.9 years, and the weighted-average discount rate for operating leases is 9.1%. As of September 30, 2021, the weighted-average remaining lease term for operating leases is 12.3 years, and the weighted-average discount rate for operating leases is 5.7%.

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 that will require us to make future payments upon the delivery of goods and services in future periods.

19

9. Collaboration and Licensing Agreements

The following is a summary description of the material revenue arrangements, including arrangements that generated revenue in the three and nine months ended September 30, 2022 and 2021.

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 one target program, ALXN1210, which is now marketed as Ultomiris®.

The Company is eligible to receive a contractual milestone 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.

Under ASC 606, Revenue from Contracts with Customers, the Company recognizes revenue for sales-based royalties upon the subsequent sale of the product. The Company recognized $7.3 million and $5.8 million of royalty revenue under this arrangement for the three months ended September 30, 2022 and 2021, respectively. The Company recognized $20.2 million and $16.4 million of royalty revenue under this arrangement for the nine months ended September 30, 2022 and 2021, respectively. As of September 30, 2022, there is a receivable of $12.5 million related to royalties due under the arrangement, and there is no deferred revenue related to this agreement.

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, Amgen applied our bispecific Fc technology to create AMG 509, a STEAP1 x CD3 XmAb 2+1 bispecific antibody, which is currently being developed by Amgen in a Phase 1 study.

No revenue was recognized under the Amgen Agreement during the three and nine months ended September 30, 2022 or 2021, and there is no 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 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.

Under the Astellas Agreement, Astellas developed ASP2138, a CLDN18.2 x CD3 bispecific antibody, which is currently being developed by Astellas in a Phase 1 study.

At March 31, 2022, the Company recorded a contract asset of $5.0 million related to a future development milestone under the Astellas Agreement, and we received the milestone payment in July 2022.

20

The Company recognized $5.0 million of revenue for the nine months ended September 30, 2022; no revenue was recognized related to the arrangement for the three months ended September 30, 2022, and 2021, or the nine months ended September 30, 2021. As of September 30, 2022, there is no deferred revenue related to the arrangement.

Astria Therapeutics, 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 development, regulatory and sales milestones, and royalties in the mid-single digit percentage range on net sales of approved products.

In January 2021, Quellis merged into Astria (formerly Catabasis), and the Company received common stock and preferred stock of Astria 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 was recorded as unrealized gain for the three months ended September 30, 2021. The Astria preferred stock is carried at its original cost and is reviewed for impairment or other changes at each reporting period.

The Company recognized an unrealized gain of $3.9 million and $2.3 million related to its equity interest in Astria for the three and nine months ended September 30, 2022, respectively. The Company recognized an unrealized loss of $2.4 million and an unrealized gain of $6.7 million related to its equity interest in Astria for the three and nine months ended September 30, 2021, respectively. There is no deferred revenue as of September 30, 2022 related to this agreement.

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. Hoffmann-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.

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%.

Pursuant to the Genentech Agreement, the Company and Genentech conducted 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 expired in March 2021. The Company is eligible for clinical milestone payments for new Collaboration Products identified from the research efforts.

The Company did not recognize revenue related to the Genentech Agreement for the three and nine months ended September 30, 2022, or the three months ended September 30, 2021. For the nine months ended September 30, 2021, the Company recognized $2.5 million of revenue. As of September 30, 2022, there is a $3.2 million payable related to cost-sharing development activities during the second quarter of 2022 for development studies being conducted under the Genentech Agreement. There is no deferred revenue as of September 30, 2022, as obligations to perform research activities have expired.

INmune Bio, Inc.

In October 2017, the Company entered into a License Agreement (the INmune Agreement) with 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 shares of INmune common stock.

21

During the three months ended September 30, 2021, the Company determined that it should no longer record its investment in INmune under the equity method and recorded its investment in INmune pursuant to ASC 321.

For the three and nine months ended September 30, 2022, the Company recorded an unrealized loss of $5.0 million and $7.5 million, respectively, related to its investment in INmune. For the three months ended September 30, 2021, the Company recorded $4.5 million of unrealized gain. For the nine months ended September 30, 2021, the Company recognized an unrealized gain of $32.5 million and a realized gain of $18.3 million.

Janssen Biotech, Inc.

Janssen Agreement

In November 2020, the Company entered into a Collaboration and License Agreement (the Janssen Agreement) with Janssen Biotech, Inc. (Janssen) pursuant to which the Company and Janssen conducted research and development activities to discover novel CD28 bispecific antibodies for the treatment of prostate cancer with Janssen maintaining exclusive worldwide rights to develop and commercialize licensed products identified from the research activities.

Under the Janssen Agreement, the Company conducted research activities and applied its bispecific Fc technology to antibodies targeting prostate cancer provided by Janssen. Upon completion of the research activities Janssen had a candidate selection option to advance an identified candidate for development and commercialization. In November 2021, the Company completed its performance obligations under the research activities and delivered CD28 bispecific antibodies to Janssen, and Janssen exercised its candidate selection option to select a bispecific CD28 antibody for further development. Janssen will assume full responsibility for development and commercialization of the CD28 bispecific antibody candidate.

Second Janssen Agreement

On October 1, 2021, the Company entered into a second Collaboration and License Agreement (the Second Janssen Agreement) with Janssen pursuant to which the Company granted Janssen an exclusive worldwide license to develop, manufacture, and commercialize plamotamab, the Company’s CD20 x CD3 development candidate, and pursuant to which Xencor and Janssen will conduct research and development activities to discover novel CD28 bispecific antibodies. The parties will conduct joint research activities for up to a two-year period to discover XmAb bispecific antibodies against CD28 and undisclosed B cell tumor-targets with Janssen receiving exclusive worldwide rights, subject to certain Xencor opt-in rights, to develop, manufacture and commercialize pharmaceutical products that contain one or more of such discovered antibodies (CD28 Licensed Antibodies). The Agreement became effective on November 5, 2021.

Pursuant to the Second Janssen Agreement, the Company received an upfront payment of $100.0 million and is eligible to receive up to $1,187.5 million in milestones which include $289.4 million in development milestones, $378.1 million in regulatory milestones and $520.0 million in sales milestones. Under the terms of the Stock Purchase Agreement, Johnson & Johnson Innovation, JJDC, Inc. (JJDC), agreed to purchase $25.0 million of newly issued unregistered shares of the Company’s common stock, priced at a 30-day volume-weighted average price of $33.4197 per share as of October 1, 2021. The Company issued JJDC 748,062 shares of its common stock which had a fair market value of $28.9 million when the shares were transferred.

The Company will collaborate with Janssen on further clinical development of plamotamab with Janssen and share development costs with Janssen paying 80% and the Company paying 20% of certain development costs.

The Company is generally responsible for conducting research activities under the Second Janssen Agreement, and Janssen is generally responsible for all development, manufacturing, and commercialization activities for CD28 Licensed Antibodies that are advanced.

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There is a receivable of $3.7 million as of September 30, 2022, related to cost-sharing activities for development of plamotamab under the Second Janssen Agreement. The Company recognized $0.1 million and $6.3 million of revenue related to the two Janssen agreements for the three months ended September 30, 2022 and 2021, respectively. The Company recognized $2.1 million and $37.0 million of revenue related to the two Janssen agreements for the nine months ended September 30, 2022, and 2021, respectively, and there is $35.2 million in deferred revenue as of September 30, 2022 related to the Second Janssen 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.

The Company recognized $2.1 million and $1.3 million of royalty revenue during the three months ended September 30, 2022 and 2021, respectively. The Company recognized $5.6 million and $16.4 million of revenue during the nine months ended September 30, 2022 and 2021, respectively. As of September 30, 2022, there is a receivable of $2.0 million related to estimated royalties due under the arrangement. As of September 30, 2022, there is no deferred revenue related to this agreement.

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.

Pursuant to the Novartis Agreement, the Company and Novartis were co-developing vibecotamab worldwide and sharing development costs. In August 2021, Novartis notified the Company it was terminating its rights with respect to the vibecotamab program, which became effective in February 2022. Under the Novartis Agreement, Novartis is responsible for its share of vibecotamab development costs through February 2023.

In June 2021, Novartis selected an Fc candidate and received a non-exclusive license to the Company’s Fc technology. Novartis will assume full responsibility for development and commercialization of the licensed Fc product candidate. The Company is eligible to receive development, clinical, and sales milestones and royalties on net sales of approved products for the licensed Fc candidate.

No revenue was recognized during the three and nine months ended September 30, 2022, or the three months ended September 30, 2021, from the Novartis Agreement. The Company recognized $41.1 million of revenue during the nine months ended September 30, 2021. As of September 30, 2022, there is a receivable of $0.3 million related to cost-sharing of development activities for the third quarter of 2022 for the vibecotamab program, and there is no deferred revenue as of September 30, 2022.

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 two targets.

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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 two novel antibodies that 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. In May 2021, the FDA granted emergency use authorization (EUA) to Vir’s COVID-19 antibody, sotrovimab (VIR-7831), for the treatment of mild-to-moderate COVID-19 in high-risk adults and patients.

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 each case, pursuant to 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, respectively. 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 recognized $17.8 million and $110.1 million of royalty revenue for the three and nine months ended September 30, 2022, respectively. The Company recognized $6.3 million and $7.7 million of revenue for the three and nine months ended September 30, 2021, respectively. As of September 30, 2022, there is a receivable of $17.8 million related to estimated royalty due under this agreement, and there is no deferred revenue related to this agreement.

Viridian Therapeutics, Inc.

In December 2020, the Company entered into a Technology License Agreement (Viridian Agreement) with Viridian, 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 and is eligible to receive development, regulatory and sales milestones, and royalties on net sales in the mid-single digit percentage range.

In December 2021, the Company entered into a second Technology License Agreement (Second Viridian Agreement) with Viridian for a non-exclusive license to certain antibody libraries developed by the Company. Under the Second Viridian Agreement, Viridian received a one-year research license to review the antibodies and the right to select up to three antibodies for further development. Viridian is responsible for all further development of the selected antibodies. The Company received an upfront payment and is eligible to receive development, regulatory and sales milestones, in addition to royalties on net sales of approved products under the Second Viridian Agreement.

In connection with the Viridian Agreement and the Second Viridian Agreement, the Company received shares of Viridian common stock.

The Company reported unrealized gain of $6.4 million and $0.5 million for the three and nine months ended September 30, 2022 related to the shares of Viridian common stock. The Company reported unrealized loss of $0.6 million for the three months ended September 30, 2021. For the nine months ended September 30, 2021, there was no unrealized gain or loss related to the shares of Viridian common stock. The Company did not recognize revenue for the three and nine months ended September 30, 2022 or 2021. There is no deferred revenue as of September 30, 2022 related to this agreement.

Zenas BioPharma Limited

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 three preclinical-stage Fc-engineered drug candidates: XmAb6755, XPro9523, and XmAb10171. Under the Zenas Agreement, Zenas will be responsible for all further development and commercialization activities for the drug candidates. The Company received a 15% equity interest in Zenas with a fair value of $16.1 million and is eligible to receive royalties on net sales of approved products in the mid-single digit to mid-teen percentage range.

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The equity in Zenas is recorded at the fair value as of the date of the Zenas Agreement and is reviewed each reporting period for impairment or other evidence of change in value.

In November 2021, the Company entered into a second License Agreement (Second Zenas Agreement) with Zenas, in which we licensed the exclusive worldwide rights to develop and commercialize the Company’s obexelimab (XmAb5871) drug candidate. Under the Second Zenas Agreement, Zenas will be responsible for all further development and commercialization activities for obexelimab. The Company received a warrant to acquire additional equity in Zenas and is eligible to receive development, regulatory and sales milestones, and royalties on net sales of approved products in the mid-single digit to mid-teen percentage range.

The warrant in Zenas is recorded at its fair value as of the date of the Second 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 or the warrant in Zenas in the three and nine months ended September 30, 2022 or 2021. The Company did not recognize any revenue related to the Zenas Agreement for the three and nine months ended September 30, 2022 or 2021, and there is no deferred revenue related to this agreement.

Revenue earned

The revenues recorded for the three and nine months ended September 30, 2022 and 2021 were earned principally from the following licensees (in millions):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Alexion	$	7.3	$	5.8	$	20.2	$	16.4
Astellas		—		—		5.0		—
Genentech		—		—		—		2.5
Janssen		0.1		6.3		2.1		37.0
MorphoSys		2.1		1.3		5.6		16.4
Novartis		—		—		—		41.1
Vir		17.8		6.3		110.1		7.7
Total	$	27.3	$	19.7	$	143.0	$	121.1

The table below summarizes the disaggregation of revenue recorded for the three and nine months ended September 30, 2022 and 2021 (in millions):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Research collaboration	$	0.1	$	6.3	$	2.1	$	79.7
Milestone		—		—		5.0		14.0
Royalties		27.2		13.4		135.9		27.4
Total	$	27.3	$	19.7	$	143.0	$	121.1

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Remaining Performance Obligations and Deferred Revenue

The Company’s remaining performance obligation as of September 30, 2022 is conducting research activities pursuant to research plans under the Second Janssen Agreement. The Company’s obligation to perform research services under the Genentech and the Novartis Agreements ended upon expiration of the respective research terms for each agreement in the second quarter of 2021. As of September 30, 2022 and 2021, the Company has deferred revenue of $35.2 million and $13.0 million, respectively. All deferred revenue as of September 30, 2022 is classified as current liabilities as the Company’s obligations to perform services are due on demand when requested by Janssen under the Second Janssen Agreement.

10. Income taxes

The provision for income tax for the three and nine months ended September 30, 2022 is $1.1 million. There was no provision for income tax for the three and nine months ended September 30, 2021. Beginning in 2022, the Tax Cuts and Jobs Act (TCJA) requires taxpayers to capitalize certain research and development costs and amortize them over five or fifteen years pursuant to Internal Revenue Code Section 174. Previously, such costs could be deducted in the period they were incurred. This provision may increase our taxable income for the tax year ended December 31, 2022 and subsequent years, and result in additional cash payments for our federal income taxes. As of September 30, 2022, 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.

11. Subsequent Event

In November 2022, Zenas closed on a Series B financing, pursuant to which a warrant to purchase Zenas equity that was held by the Company was automatically exercised, and a convertible note issued to the Company by Zenas was automatically converted with both converting into shares of Zenas’ Series B preferred stock. After the financing transaction, we will continue to record our investment in Zenas at fair value adjusted at each reporting period for impairment or other evidence of change in value. The equity shares in Zenas received from exercise of the warrant and conversion of the notes have an estimated fair value of $34.5 million and $7.7 million, respectively. As a result of the Zenas financing transaction, the estimated fair value of our investment in equity securities would increase by $17.9 million.

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, 2021 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, 2021. See also “Special Note Regarding Forward-Looking Statements” included in this Quarterly Report on Form 10-Q.

Company Overview

We are a clinical-stage biopharmaceutical company focused on discovering and developing engineered monoclonal antibody and cytokine therapeutics to treat patients with cancer and autoimmune diseases who have unmet medical needs. We and our partners are advancing a broad portfolio of clinical-stage XmAb® drug candidates from our proprietary protein engineering and technology platforms. We also use our protein engineering capabilities to increase our understanding of protein structure and interactions to design new technologies and XmAb development candidates with improved properties. In addition to engineering protein-target interactions, our approach to protein design includes engineering Fc domains, the part of an antibody that interacts with multiple segments of the immune system and controls

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antibody structure. The Fc domain is constant and interchangeable among antibodies, and our engineered XmAb Fc domains can be readily substituted for natural Fc domains.

Our protein engineering capabilities and Fc technologies enable us and our partners to develop XmAb antibodies and biotherapeutic drug candidates with improved properties and functionality, which can provide innovative approaches to treating disease and potential clinical advantage over other treatment options. For example, we have developed an antibody scaffold to rapidly create novel bispecific antibodies that bind two different targets simultaneously, creating entirely new biological mechanisms. Other applications of our protein engineering technologies enhance antibody performance by increasing immune inhibitory activity, improving cytotoxicity, extending circulating half-life and stabilizing novel protein structures, such as engineered cytokines. Three marketed XmAb medicines have been developed with our protein engineering technologies and are generating milestone payments and royalties for us.

Refer to Part I, Item 1, “XmAb Bispecific Fc Domain and New Multi-Specific Antibody Formats” and “Other XmAb Fc Domains” in the description of our business included in our Annual Report on Form 10-K for the year ended December 31, 2021 for a discussion of our core Fc technology platforms.

COVID-19

We are closely monitoring the COVID-19 pandemic and continue to evaluate its impact on all aspects of our business including how it will affect our partners, collaborations, supply chains and research and development operations. While the pandemic did not significantly disrupt our business during the three and nine months ended September 30, 2022, the changing 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 implemented restrictions, rules and guidelines that affect the continued operation of businesses. Other countries and states where we conduct manufacturing of our drug products, 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 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 may target the novel coronavirus and potentially treat patients with COVID-19. For example, sotrovimab (VIR-7831), an antibody that targets the SARS-CoV-2 virus, received an EUA from the FDA for the treatment of mild-to-moderate COVID-19 in high-risk adults and pediatric patients. Due to the high frequency of the Omicron BA.2 subvariant, sotrovimab is not currently authorized in any U.S. region. Sotrovimab currently has EUA temporary authorization or marketing approval (under the brand name Xevudy®) in more than 40 countries. Sotrovimab incorporates our Xtend Fc technology for longer duration of action.

● Revenue: We receive upfront payments, milestone payments and royalties from licensing our XmAb technologies and drug candidates. The COVID-19 pandemic has not adversely affected the amount of revenue we generate from such partnerships and collaborations for the quarter ended September 30, 2022. During this quarter, for example, we received approximately $27.2 million in revenue from our partnerships and collaborations.

Our ability to earn revenue from these and other partnerships is dependent on the ability of our partners to generate sales from products, such as Ultomiris®, Monjuvi® and sotrovimab, the ability of our partners to advance our partnered programs through later stages of development and through regulatory approval, which would entitle us to potential milestone payments. A majority of our revenue received in the first nine months of 2022 is royalty revenue from the sales of sotrovimab under our partnership with Vir. In April

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2022, GSK, which is marketing sotrovimab with Vir, announced that a majority of the total 2022 projected sales of sotrovimab was recorded in the first quarter. We recorded royalty revenues of $70.3 million, $22.1 million, and $17.8 million in the first, second, and third quarter, respectively, related to sales of sotrovimab, and based on the guidance from GSK, we expect the amount of royalties that we expect to receive from the sale of sotrovimab to continue to decline in subsequent quarters. If the COVID-19 pandemic adversely affects the sales or clinical, development and regulatory progress of partnered programs, the amount of revenue we could earn would be adversely affected.

● Clinical studies: We are currently enrolling patients into multiple clinical trials evaluating our drug candidates, and our partner Genentech is enrolling patients in multiple Phase 1 studies of XmAb306 (also known as RG6323), our co-development program with Genentech. Many partners are also enrolling patients in clinical trials with drug candidates that incorporate one or more XmAb technologies. Although the pandemic has not materially affected development of our clinical programs for the quarter ended September 30, 2022, some of our clinical programs have temporarily experienced slower patient enrollment, and the initiations of new studies for certain programs have been delayed. These delays have not broadly affected the status of our portfolio programs and have been limited to specific trials and specific sites. Many clinical sites have delayed starting new clinical trials and others have postponed enrollment to address the pandemic.

● Research, development, and administrative activities: We have implemented environmental, health, and safety procedures for all employees and have also offered reimbursement of costs incurred and time off to employees to receive vaccinations that have been authorized. We believe we provide a safe and healthy environment for our onsite employees who have been able to continue research operations, following an initial period of reduced onsite activities while new policies and procedures were developed and implemented. As of September 30, 2022, these activities have continued without interruption from the COVID-19 pandemic.

Our development activities include initiating a Phase 1 study of XmAb808, our first tumor selective CD28 bispecific candidate that targets B7-H3, and XmAb662, our IL12-Fc cytokine candidate. Several other bispecific antibody and cytokine programs are in earlier stages of development. Certain manufacturing and supply companies have indicated supply chain issues and shortages of research and manufacturing supply materials. The development timelines for additional early-stage programs and ongoing clinical programs could be affected if the supply shortages and delays continue for an extended period.

● Government credits: In the second quarter of 2022, we recorded a receivable of $3.2 million related to the U.S. Government Employee Retention Tax Credit (ERTC) Program. The ERTC was established to assist companies that were impacted by the pandemic during 2020 and 2021. The receivable relates to credits that were earned in connection with our operations in the first and second quarter of 2021.

Clinical-Stage XmAb Bispecific Antibody and Cytokine Drug Candidate Updates

Our modular XmAb bispecific Fc domains and protein engineering capabilities enable us to rapidly advance multiple drug candidates into clinical development. We and our partners are currently enrolling Phase 1 or Phase 2 studies for six wholly owned or co-development candidates to treat patients with many different types of cancer, and a candidate in development for patients with autoimmune disease.

Vudalimab (PD-1 x CTLA-4): Vudalimab 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 for patients with metastatic castration-resistant prostate cancer (mCRPC) and other solid tumor types. We are conducting a Phase 2 study of vudalimab in patients with mCRPC, as a monotherapy or in combination with chemotherapy or a PARP inhibitor depending on the tumor’s molecular subtype. We plan to present data from the first patients in the study at the Annual Meeting of the Society for Immunotherapy of Cancer (SITC) in November 2022.

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We are also conducting a second Phase 2 study in patients with advanced gynecologic malignancies, as well as clinically-defined high-risk mCRPC.

Plamotamab (CD20 x CD3): Plamotamab is a bispecific antibody that targets CD20, an antigen on B-cell tumors, and CD3, an activating receptor on T cells, and we are co-developing the program in collaboration with Janssen. Data from the dose-escalation portion of a Phase 1 study in B-cell malignancies, including from patients with relapsed or refractory non-Hodgkin’s lymphoma (NHL), indicate that plamotamab was generally well tolerated and demonstrated encouraging clinical activity as a monotherapy. Expansion cohorts are actively recruiting patients with diffuse large B-cell lymphoma (DLBCL) and follicular lymphoma (FL) and are dosing using the recommended Phase 2 regimen to further evaluate the safety and efficacy of plamotamab monotherapy. Subcutaneous administration of plamotamab is being incorporated into the study, and we plan to present data from expansion cohorts at the American Society of Hematology (ASH) Annual Meeting in December 2022.

We are also collaborating with MorphoSys AG and Incyte Corporation to investigate the chemotherapy-free triple combination of plamotamab, tafasitamab, and lenalidomide in patients with relapsed or refractory DLBCL, first-line DLBCL and relapsed or refractory FL. In May 2022, we are enrolling in the first of these studies, a potentially registration-enabling Phase 2 study, in patients with relapsed or refractory DLBCL, an aggressive type of NHL.

XmAb306/RG6323 (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 in collaboration with Genentech, a member of the Roche Group. Genentech is conducting a Phase 1 dose-escalation study of XmAb306 as a single agent and in combination with atezolizumab. In November 2021, we announced that XmAb306 promoted high levels of sustained NK cell expansion and evidence of peripheral T cell proliferation had been observed. Genentech has initiated a second study, evaluating XmAb306 in combination with daratumumab (anti-CD38 antibody) in patients with relapsed/refractory multiple myeloma. Additional studies of XmAb306 in combination with other agents are also being planned.

XmAb104 (PD-1 x ICOS): XmAb104 is a bispecific antibody that targets PD-1, an immune checkpoint receptor, and ICOS, an immune co-stimulatory receptor, to selectively activate the tumor microenvironment. We reported initial dose-escalation data from the Phase 1 study at the American Society of Clinical Oncology in June 2022. XmAb104 was well tolerated and exhibited a distinct safety profile compared to other clinical-stage ICOS programs. Anti-tumor activity was observed in patients, and biomarker activity was consistent with engagement with T cells. We are evaluating XmAb104 as a monotherapy and in combination with ipilimumab, in the expansion portion of a Phase 1 clinical study for the treatment of patients with advanced solid tumors.

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, XmAb564 was well-tolerated, promoted the selective and sustained expansion of Tregs and exhibited a favorable pharmacokinetic profile.

In November 2022, we presented data from a randomized, double-blind, placebo-controlled Phase 1a study to evaluate the safety and tolerability of a single dose of XmAb564 administered subcutaneously in healthy volunteers. The study enrolled 48 subjects, with six dose-level cohorts each randomizing six subjects to XmAb564 and two subjects to placebo. The study demonstrated that a single dose of XmAb564 is well tolerated and generates a durable, dose-dependent and selective expansion of Tregs. In the highest dose cohort (0.065 mg/kg; Cohort 6), a 117-fold mean peak expansion over baseline in CD25bright cells was observed, with an 8-fold expansion in the bulk Treg population. The ratio of Tregs to conventional T cells also increased significantly in a dose-dependent manner. At day 21, both CD25bright and total Treg counts remained markedly elevated, potentially supporting a multi-week dosing profile. All adverse events (AEs) were either Grade 1 or 2 and resolved without intervention. Injection site reaction was the most reported AE.

Xencor has dosed the first patient in a newly initiated Phase 1b, multiple-ascending dose study of XmAb564 in patients with atopic dermatitis and psoriasis.

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XmAb819 (ENPP3 x CD3): XmAb819 is a bispecific antibody that targets ENPP3 and CD3, and it is our lead XmAb 2+1 bispecific antibody candidate. ENPP3 is a tumor-associated antigen in renal cell carcinoma (RCC) and exhibits low-level expression on normal tissues. We are currently enrolling a Phase 1 study to evaluate XmAb819 in patients with advanced clear cell RCC.

Tidutamab (SSTR2 x CD3) and XmAb841 (CTLA-4 x LAG-3): In May 2022, we announced that we do not intend further internal development of tidutamab and XmAb841. Neither program demonstrated a competitive clinical profile in recent studies, and we have decided to focus resources on new clinical programs. We will continue to support patients currently enrolled and being treated. We anticipate spending on these two programs to decline throughout 2022.

XmAb808 (B7-H3 x CD28): XmAb808 is a bispecific antibody that targets B7-H3 and CD28 and is our lead XmAb CD28 T cell engager. B7-H3 is a tumor-associated antigen overexpressed on a variety of solid tumors. We are conducting a Phase 1 study to evaluate XmAb808 in patients with advanced solid tumors.

Advancements Expanding XmAb Bispecific and Cytokine Platforms

We conduct further research into the function and application of antibody components and cytokines 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 have 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. Multiple clinical-stage programs incorporate our XmAb 2+1 format, including XmAb819 (ENPP3 x CD3) and Amgen’s AMG 509 (STEAP1 x CD3).

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. We are advancing wholly owned CD28 candidates including our lead candidate, XmAb808, a B7-H3 x CD28 bispecific antibody designed to be evaluated for the treatment of patients with a range of solid tumors.

Our CD28 platform is also the subject of two collaborations with Janssen. The first collaboration was announced in 2020 and involves our research efforts to create and characterize CD28 bispecific antibody candidates against a prostate tumor target specified by Janssen. The second Janssen collaboration was announced in October 2021 and includes conducting research activities with Janssen to create and characterize CD28 bispecific antibody candidates against B-cell targets during a two-year period, with Janssen having an exclusive worldwide license to develop selected molecules from the research activities in combination with plamotamab and other agents, such as other CD3 bispecific antibodies.

In April 2022, we presented emerging preclinical data from two wholly owned cytokine programs at the American Association for Cancer Research Annual Meeting: XmAb143, a decoy-resistant and potency-reduced IL18-Fc fusion protein, and a LAG-3 targeted IL15/IL15Rα-Fc fusion protein, which is biased toward binding and activating LAG-3-positive immune cells that are more likely to be tumor-reactive.

In November 2023, at the SITC Annual Meeting, we plan to present additional preclinical data from the IL18-Fc fusion protein and LAG-3 IL15/IL15Rα-Fc fusion protein programs, as well as preclinical data from our NK cell engager platform and costimulatory CD28 trispecific antibodies targeting PDL1 and PDL2.

In 2023, we plan to submit an IND application for XmAb662, a wholly owned, reduced-potency IL12-Fc cytokine and initiate a Phase 1 study in patients with advanced solid tumors.

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Progress Across Partnerships

A key part of our business strategy is to leverage our protein engineering capabilities, XmAb Fc domains and drug candidates with partnerships, collaborations and licenses. 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 into 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 that could potentially be developed in rational combinations with our drug candidates.

The FDA approved Monjuvi® (tafasitamab-cxix) under accelerated approval in July 2020. Monjuvi is 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, including DLBCL arising from low grade lymphoma, and who are not eligible for autologous stem cell transplant (ASCT). This indication is approved under accelerated 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). In August 2021, the European Commission granted conditional marketing authorization for Minjuvi® (tafasitamab) in combination with lenalidomide, followed by tafasitamab monotherapy, for the treatment of adult patients with relapsed or refractory diffuse large B-cell lymphoma (DLBCL) who are not eligible for autologous stem cell transplantation (ASCT). Tafasitamab was created and initially developed by us. Tafasitamab is co-marketed by Incyte and MorphoSys under the brand name Monjuvi in the U.S. and is marketed by Incyte under the brand name Minjuvi in the E.U. Incyte has exclusive commercialization rights to tafasitamab outside the U.S. Monjuvi® and Minjuvi® are registered trademarks of MorphoSys AG. We earned $2.1 million in estimated royalties from MorphoSys for the three months ended September 30, 2022.

Novel Bispecific Antibody Collaborations

Novel bispecific antibody collaborations are arrangements in which our partner seeks to create a bispecific antibody using one or more of our XmAb bispecific technologies. Our partners provide an antibody or a tumor-associated antigen, and we conduct limited research and development to create potential bispecific antibody candidates for further development and commercialization by our partners.

In September 2015, we entered into an agreement with Amgen Inc. to develop and commercialize bispecific antibody product candidates using our proprietary XmAb bispecific Fc technology. Amgen applied our XmAb bispecific Fc technology to create AMG 509, a STEAP1 x CD3 XmAb 2+1 bispecific antibody, which is being evaluated in an ongoing dose-escalation Phase 1 study for patients with prostate cancer. In February 2022, Amgen presented encouraging, preliminary pharmacodynamic activity by induction of percent maximum prostate-specific antigen (PSA) decline among 30 patients in the study, which provides an early signal of activity and validation of the potential of the XmAb 2+1 format.

In March 2019, we entered into an agreement with Astellas Pharma, Inc., under which we applied our XmAb bispecific Fc technology to an antigen pair provided by Astellas and generated bispecific antibody candidates for further certain characterization and testing. Astellas selected a bispecific antibody developed under the collaboration, ASP2138, a CLDN18.2 x CD3 bispecific antibody, for further development and is conducting a Phase 1 clinical study in patients with gastric, gastroesophageal, and pancreatic cancers. We recognized a $5.0 million milestone from Astellas for a development milestone in the first quarter of 2022.

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In July 2022, we entered into an agreement with Caris Life Sciences, under which Caris will apply its proprietary end-to-end discovery platform to identify novel targets for XmAb bispecific antibody drug candidates, for the treatment of patients with cancer. Xencor will receive exclusive options to research, develop and commercialize products directed to up to three targets. Caris will receive an upfront payment and will be eligible to receive up to approximately $120.0 million in license fees, discovery, development, regulatory and sales-based milestones, in addition to royalty payments on net sales of each product commercialized by Xencor and future rights for molecular profiling and companion diagnostics for drug candidates developed under the collaboration.

Technology License Agreements

We enter into technology licensing agreements in which we license access to one or more of our XmAb Fc domains 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. and multiple global markets for the treatment of patients with paroxysmal nocturnal hemoglobinuria (PNH) and for patients with atypical hemolytic uremic syndrome (aHUS). In April 2022, Ultomiris was approved by the FDA for the treatment of adult patients with generalized myasthenia gravis (gMG) who are anti-acetylcholine receptor (AChR) antibody positive. Alexion is also evaluating Ultomiris in a broad late-stage development program across many indications in neurology and nephrology. We earned $7.3 million in royalties from Alexion for the three months ended September 30, 2022.

Vir has non-exclusive access to multiple XmAb Fc technologies, including Xtend™ Fc technology, designed to extend the half-life of novel antibodies that Vir is investigating as potential treatments for patients with COVID-19. In May 2021, the FDA granted EUA to sotrovimab (VIR-7831) for the treatment of mild-to-moderate COVID-19 in high-risk adults and pediatric patients. A second drug candidate, VIR-7832, is in a Phase 1b/2a trial of adults with mild-to-moderate COVID-19. We earned $17.8 million in royalties from Vir for the three months ended September 30, 2022.

Vir has advanced two additional programs under our August 2019 agreement. VIR-2482 is being evaluated in a Phase 2 study as a universal prophylactic for influenza A. In October 2022, Vir announced that development of VIR-2482 in a Phase 2 study, which dosed its first patient the same month. Additionally, VIR-3434 is being evaluated in a Phase 2 combination study as a potential treatment for patients with hepatitis B virus infection and hepatitis D virus infection.

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 description of the key terms of our arrangements.

We have over 1,300 issued and pending patents worldwide to protect our XmAb technology platform and XmAb drug candidates.

Since we commenced active operations in 1998, we have devoted substantially all our resources to staffing our 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 internally developed products approved for commercial sale and have not generated any revenues from our own 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 September 30, 2022, we had an accumulated deficit of $326.2 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.

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Results of Operations

Comparison of the Three Months Ended September 30, 2022 and 2021

The following table summarizes our results of operations for the three months ended September 30, 2022 and 2021 (in millions):

	Three Months Ended
	September 30,
	2022		2021		Change
Revenues:
Research collaboration	$	0.1	$	6.3	$	(6.2)
Royalties		27.2		13.4		13.8
Total revenues		27.3		19.7		7.6
Operating expenses:
Research and development		53.3		50.6		2.7
General and administrative		12.4		10.4		2.0
Total operating expenses		65.7		61.0		4.7
Other income, net		6.7		1.1		5.6
Loss before income tax expense		(31.7)		(40.2)		8.5
Income tax expense		1.1		—		1.1
Net loss	$	(32.8)	$	(40.2)	$	7.4

Revenues

Revenues for the three months ended September 30, 2022 are primarily from royalty revenue from Alexion and Vir. Revenues for the three months ended September 30, 2021 are primarily from the collaboration with Janssen and royalty revenue from Alexion and Vir.

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Research and Development Expenses

The following tables summarize our research and development expenses for the three months ended September 30, 2022 and 2021 (in millions):

	Three Months Ended
	September 30,
	2022		2021		Change
Product programs:
Bispecific programs:
CD3 programs:
Vibecotamab(1)(2)	$	0.9	$	1.5	$	(0.6)
Plamotamab(3)		6.4		9.3		(2.9)
Tidutamab(4)		2.9		3.3		(0.4)
XmAb819 (ENPP3 x CD3)		2.5		3.9		(1.4)
Total CD3 programs		12.7		18.0		(5.3)
XmAb808 (B7-H3 x CD28)		3.9		3.3		0.6
Tumor micro environment (TME) activator programs:
Vudalimab		5.5		6.7		(1.2)
XmAb104		5.2		2.6		2.6
XmAb841(5)		1.9		3.5		(1.6)
Total TME activators programs		12.6		12.8		(0.2)
Cytokine programs:
XmAb306/RG6323 programs(6)		4.1		5.7		(1.6)
XmAb564		4.5		3.7		0.8
XmAb662 (IL-12-Fc)		5.4		2.1		3.3
IL-18-Fc		2.3		—		2.3
Total cytokine programs		16.3		11.5		4.8
Subtotal bispecific programs		45.5		45.6		(0.1)
Other, research and early stage programs		7.8		5.0		2.8
Total research and development expenses	$	53.3	$	50.6	$	2.7

(1) The costs are net of cost-sharing reimbursement from Novartis under the Novartis Agreement.

(2) Represents wind down costs of the program; Novartis and the Company stopped development of the vibecotamab program in 2021.

(3) The costs are net of cost-sharing reimbursement from Janssen under the Second Janssen Agreement.

(4) Represents wind down costs of the program; the Company stopped development of the tidutamab program in the second quarter of 2022.

(5) Represents wind down costs of the program; the Company stopped development of the XmAb841 program in the second quarter of 2022.

(6) Includes our share of costs paid to Genentech for cost-sharing under the Genentech Agreement.

	Three Months Ended
	September 30,
	2022		2021		Change
External research and development expenses	$	25.5	$	28.2	$	(2.7)
Internal research and development expenses		19.8		16.8		3.0
Stock based compensation		8.0		5.6		2.4
Total research and development expenses	$	53.3	$	50.6	$	2.7

Research and development expenses increased by $2.7 million for the three months ended September 30, 2022 over the same period in 2021 primarily due to increased spending on our new development programs, XmAb662, and IL-18 programs, partially offset by reduced spending on our CD3 programs.

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General and Administrative Expenses

The following table summarizes our general and administrative expenses for the three months ended September 30, 2022 and 2021 (in millions):

	Three Months Ended
	September 30,
	2022		2021		Change
General and administrative	$	12.4	$	10.4	$	2.0

General and administrative expenses increased by $2.0 million for the three months ended September 30, 2022 over the same period in 2021 primarily due to increased general and administrative staffing and additional spending on professional fees.

Other Income, Net

Other income, net was $6.7 million and $1.1 million for the three months ended September 30, 2022 and 2021, respectively. Other income, net for the three months ended September 30, 2022 consists of unrealized gains recognized from the change in fair value of our equity investments and interest income earned on investments, while other income, net for the same period in 2021 consist primarily of unrealized gain recognized from the change in fair value of our equity investments.

Comparison of the Nine Months Ended September 30, 2022 and 2021

The following table summarizes our results of operations for the nine months ended September 30, 2022 and 2021 (in millions):

	Nine Months Ended
	September 30,
	2022		2021		Change
Revenues:
Research collaboration	$	2.1	$	79.7	$	(77.6)
Milestone		5.0		14.0		(9.0)
Royalties		135.9		27.4		108.5
Total revenues		143.0		121.1		21.9
Operating expenses:
Research and development		148.1		141.5		6.6
General and administrative		34.7		27.5		7.2
Total operating expenses		182.8		169.0		13.8
Other income (expense), net		(2.2)		57.5		(59.7)
Income (loss) before income tax expense		(42.0)		9.6		(51.6)
Income tax expense		1.1		—		1.1
Net income (loss)	$	(43.1)	$	9.6	$	(52.7)

Revenues

Revenues for the nine months ended September 30, 2022 are primarily from milestone revenue from Astellas and royalty revenue from Alexion, MorphoSys, and Vir. Revenues for the nine months ended September 30, 2021 are primarily from our collaboration with Janssen, milestone revenue recognized from MorphoSys and Novartis, research revenue recognized under the Genentech and Novartis collaborations, and the royalty revenue from Alexion, MorphoSys, and Vir. 

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Research and Development Expenses

	Nine Months Ended
	September 30,
	2022		2021		Change
Product programs:
Bispecific programs:
CD3 programs:
Vibecotamab(1)(2)		3.8		6.5		(2.7)
Plamotamab(3)		13.6		26.2		(12.6)
Tidutamab(4)		9.2		11.5		(2.3)
XmAb819 (ENPP3 x CD3)		8.1		11.2		(3.1)
Total CD3 programs		34.7		55.4		(20.7)
XmAb808 (B7-H3 x CD28)		12.9		4.0		8.9
Tumor micro environment (TME) activator programs:
Vudalimab		16.5		18.9		(2.4)
XmAb104		17.0		11.4		5.6
XmAb841(5)		6.5		8.9		(2.4)
Total TME activators programs		40.0		39.2		0.8
Cytokine programs:
XmAb306/RG6323 programs(6)		11.9		12.8		(0.9)
XmAb564		11.3		10.5		0.8
XmAb662 (IL-12-Fc)		12.6		2.8		9.8
IL-18-Fc		3.0		—		3.0
Total cytokine programs		38.8		26.1		12.7
Subtotal bispecific programs		126.4		124.7		1.7
Other, research and early stage programs		21.7		16.8		4.9
Total research and development expenses	$	148.1	$	141.5	$	6.6

(1) The costs are net of cost-sharing reimbursement from Novartis under the Novartis Agreement.

(2) Represents wind down costs of the program; Novartis and the Company stopped development of the vibecotamab program in 2021.

(3) The costs are net of cost-sharing reimbursement from Janssen under the Second Janssen Agreement.

(4) The Company stopped development of the tidutamab program in the second quarter of 2022.

(5) The Company stopped development of the XmAb841 program in the second quarter of 2022.

(6) Includes our share of costs paid to Genentech for cost-sharing under the Genentech Agreement.

	Nine Months Ended
	September 30,
	2022		2021		Change
External research and development expenses	$	66.5	$	75.5	$	(9.0)
Internal research and development expenses		58.2		48.7		9.5
Stock based compensation		23.4		17.3		6.1
Total research and development expenses	$	148.1	$	141.5	$	6.6

Research and development expenses increased by $6.6 million for the nine months ended September 30, 2022 over the same period in 2021 primarily due to increased spending on our new development programs, XmAb808, XmAb662, and IL-18 programs, partially offset by reduced spending on our CD3 programs.

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General and Administrative Expenses

The following table summarizes our general and administrative expenses for the nine months ended September 30, 2022 and 2021 (in millions):

	Nine Months Ended
	September 30,
	2022		2021		Change
General and administrative	$	34.7	$	27.5	$	7.2

General and administrative expenses increased by $7.2 million for the nine months ended September 30, 2022 over the same period in 2021 primarily due to increased general and administrative staffing, spending on professional fees, and additional facility expenses.

Other Income (Expense), Net

Other income (expense), net was ($2.2) million and $57.5 million for the nine months ended September 30, 2022 and 2021, respectively. Other income (expense) net for the nine months ended September 30, 2022 consists primarily of unrealized loss recognized from the change in fair value of our equity investments, partially offset by the interest income recognized from our marketable debt securities. Other income (expense), net for the nine months ended September 30, 2021 consists primarily of realized gain from the sale of an equity instrument, as well as the unrealized gain recognized from the change in our accounting for an equity investment, and unrealized gain recognized with respect to the exchange of shares without a readily determinable fair value for shares in an entity with a readily determinable fair value.

Cash Flows

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

	Nine Months Ended
	September 30,
	2022		2021		Change
Net cash provided by (used in):
Operating activities	$	48,916	$	(78,643)	$	127,559
Investing activities		(144,273)		(54,109)		(90,164)
Financing activities		4,531		10,408		(5,877)
Net decrease in cash	$	(90,826)	$	(122,344)	$	31,518

Operating Activities

Cash provided by operating activities for the nine months ended September 30, 2022 was $48.9 million, while cash used in operating activities for the nine months ended September 30, 2021 was $78.6 million. The increase in cash provided by operating activities is primarily due to additional royalty revenue recognized in the nine months ended September 30, 2022.

Investing Activities

Investing activities consist primarily of investments in marketable debt 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 represents net proceeds from the exercise of stock options and ESPP purchase for the nine months ended September 30, 2022 and September 30, 2021, respectively. The proceeds received from option exercises decreased by $5.9 million over the same period in 2021.

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Liquidity and Capital Resources

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

As of September 30, 2022, we had $654.6 million of cash, cash equivalents, receivables, and marketable debt securities compared to $664.1 million as of December 31, 2021. The investments in marketable debt securities are further described above in Note 5, Marketable Debt and Equity Securities, of Notes to Financial Statements included in 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 and contingent payments, and royalties. Our ability to receive additional 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.

Funding Requirements

We have not generated any revenue from the sale of products developed by us to date and do not expect to do so until we obtain regulatory approval of and commercialize one or more of our internal product development 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 internal product development candidates. We expect that we will continue to increase our operating expenses in connection with ongoing as well as additional clinical and preclinical development of product candidates in our pipeline and also development candidates that we are co-developing with our partners.

Although it is difficult to predict our funding requirements, based upon our current operating plan, we expect that our existing cash, cash equivalents, marketable securities, and certain potential milestone payments will fund our operating expenses and capital expenditure requirements through the end of 2025. 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 September 30, 2022.

Critical Accounting Policies

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

ITEM 3.  Quantitative and Qualitative Disclosures about Market Risk

There have been no material changes in the quantitative or qualitative aspects of our market risk profile. For additional information regarding the Company’s exposure to certain market risks, see “Item 7A. Quantitative and Qualitative Disclosures About Market Risk” included in the Form 10-K for the fiscal year ended December 31, 2021.

38

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 September 30, 2022. 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 September 30, 2022.

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 September 30, 2022 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.

39

PART II — OTHER INFORMATION

ITEM 1. Legal Proceedings.

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 I, “Item 1A. Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2021, 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, 2021, 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.

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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	Second Amendment to Lease, dated August 2, 2022, by and between the Company and AG-LC 465 North Halstead Owner, L.P.
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)

41

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: November 7, 2022

42

EX-10.1

Exhibit 10.1

SECOND AMENDMENT TO LEASE

(465 North Halstead)

THIS SECOND AMENDMENT TO LEASE (“Second Amendment”) is made and entered into as of the 2^nd day of August, 2022, by and between AG-LC 465 NORTH HALSTEAD OWNER, L.P., a Delaware limited partnership (“Landlord”) and XENCOR, INC., a Delaware corporation (“Tenant”).

R E C I T A L S:

A.Landlord and Tenant entered into that certain Lease dated as of April 30, 2021 (the “Original Lease”), as modified by that certain First Amendment to Lease dated as of July 13, 2021 by and between Landlord and Tenant (“First Amendment”), whereby Landlord leased to Tenant and Tenant leased from Landlord certain space located in that certain building located and addressed at 465 North Halstead Street, Pasadena, California (the “Building”).  The Original Lease, as modified by the First Amendment, may be referred to herein as the “Lease.”

B.By this Second Amendment, Landlord and Tenant desire to convert a portion of the Premises to a common area lobby and to otherwise modify the Lease as provided herein.

C.Unless otherwise defined herein, capitalized terms as used herein shall have the same meanings as given thereto in the Lease.

NOW, THEREFORE, in consideration of the foregoing recitals and the mutual covenants contained herein, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto hereby agree as follows:

A G R E E M E N T:

1.Premises.  Pursuant to the Lease, Landlord leases to Tenant, and Tenant leases from Landlord, the Premises.  The Premises include that certain space on the second (2^nd) floor of the Building commonly known as Suites 200 and 225 containing 83,082 rentable square feet and identified in the Lease as the “Phase 1 Premises” as more particularly described in the Lease.

2.Tenant’s Work.  

2.1.Tenant’s Lobby Work.  Tenant shall, pursuant to the terms and conditions of the Tenant Work Letter attached to the Lease, reconfigure a portion of the Building to create a lobby to be shared equally in common by Tenant and the Existing Tenant (“Tenant’s Lobby Work”).  The proposed configuration of the lobby is depicted on Exhibit “A” attached hereto; provided, however, that the actual plans and specifications for Tenant’s Lobby Work, to the extent not set forth on Exhibit “A”  or not consistent therewith, shall be subject to Landlord’s reasonable approval consistent with the terms of the Tenant Work Letter applicable to Landlord’s approval of the Tenant Improvements provided, further, however, that Landlord hereby confirms that the Existing Tenant has no right to approve Tenant’s Lobby Work under the Existing Lease and has not otherwise been granted such right by Landlord.  Tenant’s Lobby Work shall be at Tenant’s

4856-4214-1959.9

391226.00001/8-25-22/MLT/pah

sole cost and expense except that Landlord will increase the Phase 1 Tenant Improvement Allowance by Fifty Thousand Dollars ($50,000.00) (for a total Phase 1 Tenant Improvement Allowance equal to Seventeen Million Eighty-Two Thousand and 15/100 Dollars ($17,082,015.00)) to help Tenant pay for Tenant’s Lobby Work, provided that such increase in the Phase 1 Tenant Improvement Allowance shall be deemed part of the Allowances for all purposes permitted under the Tenant Work Letter and may be applied with respect to any of the Tenant Improvementsthrough the Phase 2 Allowance Outside Date.  Tenant hereby acknowledges that Tenant shall be performing Tenant’s Lobby Work during the Existing Tenant’s occupancy of the Existing Lease premises and Tenant shall use commercially reasonable efforts (i) to have Tenant’s Lobby Work completed not later than December 31, 2023, and (ii) to not unreasonably interfere with the Existing Tenant’s business in the Existing Tenant’s premises during the performance of Tenant’s Lobby Work.  During Tenant’s performance of Tenant’s Lobby Work, Tenant shall use commercially reasonable efforts to ensure that Tenant’s Lobby Work shall not prevent the Existing Tenant from reasonable access to the Existing Tenant’s premises at all times such access is otherwise permitted.  Tenant shall, upon completion of Tenant’s Lobby Work and thereafter throughout the term of the Existing Term as described in the Lease, be responsible for all HVAC costs for such lobby, provided that the foregoing does not constitute a waiver by Tenant of any recourse against Existing Tenant for any negligent or intentional acts affecting the shared lobby.  Landlord acknowledges and agrees that Landlord shall be responsible for the maintenance and repair of fire life safety, doors and access for the Existing Tenant following completion of Tenant’s Lobby Work. On the Phase 2 Premises Delivery Date, the area comprising the lobby shall be deemed to be part of the Premises. In no event shall Tenant be required to pay Base Rent on the area comprising the lobby in the event that the Existing Tenant extends the term of the Existing Lease, which extension shall only occur as required under the Existing Lease unless Tenant otherwise consents thereto in its sole discretion.

2.2.Tenant’s EV Charging Station Work.  Tenant desires to install electric vehicle charging stations in the Parking Facility serving the Building (collectively, “Proposed Work”).   The plans and specifications (prepared by Gensler and dated June 29, 2022) for such Proposed Work are set forth on Exhibit “F” attached hereto and are hereby approved by Landlord.  All costs for the Proposed Work shall be Tenant’s responsibility.  Without limiting the generality of the foregoing, any Parking Facility restriping required by the City of Pasadena and necessitated by the Proposed Work shall be Tenant’s responsibility, at Tenant’s sole cost.  In addition, Tenant shall be responsible for any patching and asphalt reslurry disturbed by any electrical trenching performed by Tenant, including blending the new slurry with the existing asphalt slurry.  Tenant’s Proposed Work shall be performed in accordance with all of the terms and conditions of the Lease including, but not limited to, Article 8 of the Original Lease.  During the Lease Term, Landlord shall have the right, at Landlord’s sole cost and upon at least sixty (60) days prior written notice to Tenant, to relocate the EV charging stations to another location within the Project.  Landlord shall endeavor to complete such work within sixty (60) days after the date of Landlord’s relocation notice (or as soon thereafter as reasonably possible).  The EV charging stations shall be for Tenant’s exclusive use; provided, however, that Tenant (and not Landlord) shall be responsible for limiting access of the EV charging stations to Tenant (and in no event shall Landlord be responsible or liable for any use of such EV charging stations by third parties).

3.Standard Tenant Services.  Section 6.1.1 of the Original Lease is hereby deemed deleted in its entirety and replaced with the following:

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“6.1.1The heating and air conditioning system (“HVAC”) which serves only the Premises shall be controlled by Tenant and Landlord shall not be responsible for providing HVAC service to the Premises (and Tenant shall, at Tenant’s sole cost, be responsible for all costs regarding the repair and maintenance of the same). Landlord shall be responsible for any capital repair or replacement of the HVAC, which shall be treated as, and subject to the requirements applicable to, Reimbursable Capital Improvements.  Notwithstanding anything above to the contrary, all existing and future HVAC equipment that is not set forth in Exhibit “E” attached hereto (collectively, “Landlord’s HVAC Equipment”) shall be Tenant’s sole responsibility and Tenant shall be responsible for the repair, maintenance and replacement of the same at Tenant’s sole cost and expense.”  

4.Overstandard Tenant Use.  Section 6.2 of the Original Lease is hereby deemed deleted in its entirety and replaced with the following:

“6.2Overstandard Tenant Use.  Tenant’s use of electricity shall never exceed the capacity of the feeders to the Project or the risers or wiring installation of the same.”

5.Existing Generator.  Landlord and Tenant acknowledge and agree that there is an existing generator in the Project which exclusively serves the Premises (“Existing Generator”), the location of which Existing Generator is depicted on Exhibit “B” attached hereto (“Generator Area”).  Upon written notice to Landlord, Tenant may elect to own the Existing Generator.  Following Tenant’s delivery of such notice, effective as of the later of (i) the date of the full execution and delivery of a bill of sale between Landlord and Tenant (in the form of Exhibit “C” attached hereto) and (ii) the Permit Issuance Date (as defined below), Tenant shall own and control such Existing Generator.  Tenant acknowledges and agrees that Landlord makes no representation or warranty whatsoever with respect to the Existing Generator, including any warranty of fitness for a particular purpose. By purchasing the Existing Generator, Tenant acknowledges that it has not relied on any representation or warranty made by Landlord or any other person on Landlord’s behalf except as set forth in the Bill of Sale.  Tenant acknowledges that the Existing Generator is being sold in its then “as is” condition subject to the terms of the Bill of Sale.  Such Existing Generator shall be used by Tenant only during (i) testing and regular maintenance, and (ii) any period of electrical power outage in the Premises.  Tenant shall be entitled to operate the Existing Generator for testing and regular maintenance upon prior written notice to Landlord (subject to the requirements of governmental agencies or instrumentalities with jurisdiction thereover, which requirements shall control).  An express condition to Tenant’s entry into the Generator Area is Tenant being escorted by a representative of Landlord and Landlord shall at all times make a representative available during normal business hours for such purpose except in the case of emergency where Tenant shall not be required to be escorted by a representative of Landlord if such representative is not reasonably available or such emergency occurs outside of normal business hours.  From and after the effect date of its ownership of the Existing Generator as provided in this Second Amendment, Tenant shall ensure that the Existing Generator does not result in any Hazardous Materials being introduced to the Project and Article 5 of the Original Lease will apply to Tenant's use of the Existing Generator, provided that Tenant shall not be liable for any matter regarding the Existing Generator, including violations of law, Hazardous Materials, or the requirements of the Existing Permit and the SCAQMD (as defined below) arising from or accruing to periods prior to Tenant’s ownership of the Existing Generator.  Further, Tenant shall

4856-4214-1959.9 391226.00001/8-25-22/MLT/pah -3-

be responsible for ensuring that its use and operation of the Existing Generator does not unreasonably interfere with the use of the Building by other tenants.  During the Term of the Lease, any repairs and maintenance of the Existing Generator shall be the sole responsibility of Tenant.  Tenant shall have no obligation to remove such Existing Generator (including any wires or conduits) upon the expiration or earlier termination of the Lease.  The Existing Generator shall be deemed to be a part of the Premises for purposes of Article 10 of the Original Lease.  Attached hereto as Exhibit “D” is the current permit issued by the South Coast Air Quality Management District (“SCAQMD”) allowing the operating of the Existing Generator (the “Existing Permit”).  Landlord represents and warrants to Tenant that the Existing Permit is in full force and effect without default of Landlord thereunder.  As soon as practicable after the date hereof, Tenant shall cause the Existing Permit to be reissued in the name of Tenant as the “Legal Owner or Operator” referenced therein.  The date of such reissuance of such permit is referred to herein as the “Permit Issuance Date” and Tenant shall promptly provide Landlord with a copy of such reissued permit.  Notwithstanding anything in this Amendment to the contrary, in the event that SCAQMD fails to reissue such permit in the name of Tenant, the Existing Generator shall remain in Landlord’s ownership and control and the Existing Permit shall remain in Landlord’s name.

6.Disbursement of Allowances.  The first sentence after the definition “Draw Request Approval Period” in Section 2.2.2.1 of the Tenant Work Letter is deemed deleted and replaced with the following:  

“Within thirty (30) days after the later of the Submittal Date and Landlord's receipt of such Monthly Draw Request, as to those portions of the applicable Monthly Draw Request which Landlord has approved during the Draw Request Approval Period, Landlord shall pay directly to  Tenant (unless Tenant has notified Landlord that Tenant requires that Landlord deliver a check to Contractor or a check made jointly payable to Contractor and Tenant) in payment of the lesser of (A) the amounts so requested by Tenant, as set forth in this Section 2.2.2.1, above, less a ten percent (10%) retention (the aggregate amount of such retentions to be known as the "Final Retention") and (B) the balance of any remaining available portion of the Allowances (not including the Final Retention), excluding such portions of the Monthly Draw Request for payment for work that Landlord determines and asserts in good faith is materially non-compliant with the Approved Working Drawings (as defined below).”

Section 2.2.2.2 of the Tenant Work Letter is deemed deleted in its entirety and replaced with the following:

“Final Retention.  Subject to the provisions of this Tenant Work Letter, a check for the Final Retention payable to Tenant (unless Tenant has notified Landlord that Tenant requires that Landlord deliver a check to Contractor or a check made jointly payable to Contractor and Tenant) shall be delivered by Landlord to Tenant and/or Contractor (as applicable) following the completion of construction of the applicable portion of the Premises, provided that Tenant has delivered to Landlord:  (A) properly executed and final unconditional mechanics lien releases in compliance with applicable California law; (B) a certificate of occupancy or permit cards signed off by the City of Pasadena (the "City") with respect to the Premises; (C) as-built plans and City-permitted plans for the Tenant Improvements; (D) operation manuals and warranties for equipment included within the

4856-4214-1959.9 391226.00001/8-25-22/MLT/pah -4-

Tenant Improvements and paid for with Allowance funds, if applicable; (E) copy of the contract with the Contractor; (F) copy of the Contractor's certificate of insurance, including Additional Insured endorsement naming Landlord (and any other party reasonably requested by Landlord) as additional insureds; and (G) the Contractor's schedule of values, showing total contract value.”

7.Tenant’s Exercise of Additional Phase 1 Allowance.  Tenant hereby exercises Tenant’s right to receive the Additional Phase 1 Allowance pursuant to Section 2.1 of the Tenant Work Letter for an additional Sixty Dollars ($60.00) per rentable square foot of the Phase 1 Premises. The Additional Phase 1 Allowance is $4,984,980.00 (for a total Phase 1 Tenant Improvement Allowance equal to Twenty-Two Million Sixty-Six Thousand Nine Hundred Ninety-Five Dollars ($22,066,995.00)).  Notwithstanding anything to the contrary in the Lease, the increase in Base Rent for the Phase 1 Premises attributable to the Additional Phase 1 Allowance shall not be included as part of Base Rent for the Phase I Premises for purposes of the determination of Base Rent for the Phase 2 Premises under Section 8.2 of the Lease.

8.Restatement of Base Rent for Phase 1 Premises.  In accordance with Section 2.1 of the Tenant Work Letter (and Tenant’s exercise of Tenant’s right to receive Additional Phase 1 Allowance), Section 8.1 of the Original Lease is hereby deemed deleted in its entirety and replaced with the following:

“8.1Base Rent For Phase 1 Premises:

Lease Period	Annual Base Rent	Monthly Installment of Base Rent	Monthly Rental Rate per Rentable Square Foot
*08/01/22 – 07/31/23	$4,994,949.90	$416,245.83	$5.01
08/01/23 – 07/31/24	$5,134,030.90	$427,835.91	$5.15
08/01/24 – 07/31/25	$5,277,284.20	$439,773.69	$5.29
08/01/25 – 07/31/26	$5,424,835.20	$452,069.60	$5.44
08/01/26 – 07/31/27	$5,576,812.80	$464,734.40	$5.59
08/01/27 – 07/31/28	$5,733,349.50	$477,779.13	$5.75
08/01/28 – 07/31/29	$5,894,582.50	$491,215.21	$5.91
08/01/29 – 07/31/30	$6,060,652.40	$505,054.37	$6.08
08/01/30 – 07/31/31	$6,231,704.40	$519,308.70	$6.25
08/01/31 – 07/31/32	$6,407,888.00	$533,990.67	$6.43
08/01/32 – 07/31/33	$6,589,357.00	$549,113.09	$6.61
08/01/33 – 07/31/34	$6,776,270.20	$564,689.19	$6.80
08/01/34 – 07/31/35	$6,968,790.80	$580,732.57	$6.99

4856-4214-1959.9 391226.00001/8-25-22/MLT/pah -5-

9.Building Systems and Equipment.  From and after the date hereof, Tenant, as the operator of the HVAC system serving the Premises and the other Premises Systems, shall comply with all rules and regulations of the SCAQMD applicable thereto including, but not limited to, Rules 1415 and 222 (and Tenant shall be deemed to be the “operator” of any such Premises Systems for purposes of such SCAQMD rules and regulations).  Tenant’s indemnity obligations under the Lease shall apply with full force and effect to Tenant’s obligations pertaining to the SCAQMD.  The foregoing does not operate to modify any obligations of Landlord under Article 7 of the Original Lease (as such obligations are modified by Section 6.1.1 of the Original Lease).

10.Authority.  Each party represents and warrants that it has full right and authority to enter into this Second Amendment and to perform all of its obligations hereunder and that all persons signing this Second Amendment on its behalf are authorized to do so.

11.Brokers.  Each party represents and warrants to the other that no broker, agent or finder negotiated or was instrumental in negotiating or consummating this Second Amendment.  Each party further agrees to defend, indemnify and hold harmless the other party from and against any claim for commission or finder’s fee by any person or entity who claim or allege that they were retained or engaged by the indemnifying party or at the request of such party in connection with this Second Amendment.

12.Signatures.  The parties hereto consent and agree that this Second Amendment may be signed and/or transmitted by facsimile, e-mail of a .pdf document or using electronic signature technology (e.g., via DocuSign or similar electronic signature technology), and that such signed electronic record shall be valid and as effective to bind the party so signing as a paper copy bearing such party’s handwritten signature.  The parties further consent and agree that (1) to the extent a party signs this Second Amendment using electronic signature technology, by clicking “SIGN”, such party is signing this Second Amendment electronically, and (2) the electronic signatures appearing on this Second Amendment shall be treated, for purposes of validity, enforceability and admissibility, the same as handwritten signatures.

13.Defaults.  Tenant hereby represents and warrants to Landlord that, as of the date of this Second Amendment, Tenant is in full compliance with all terms, covenants and conditions of the Lease and that there are no breaches or defaults under the Lease by Landlord or Tenant, and that Tenant knows of no events or circumstances which, given the passage of time, would constitute a default under the Lease by either Landlord or Tenant.  Landlord hereby represents and warrants to Tenant that, as of the date of this Second Amendment, Landlord is in full compliance with all terms, covenants and conditions of the Lease and that there are no breaches or defaults under the Lease by Landlord or Tenant, and that Landlord knows of no events or circumstances which, given the passage of time, would constitute a default under the Lease by either Landlord or Tenant.

14.No Further Modification. Except as set forth in this Second Amendment, all of the terms and provisions of the Lease shall remain unmodified and in full force and effect.

[Signatures Appear On Following Page]

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IN WITNESS WHEREOF, this Second Amendment has been executed as of the date first set forth above.

“Landlord”	AG-LC 465 NORTH HALSTEAD OWNER, L.P., a Delaware limited partnership By:  /s/ Laura Metzger                                               Name:  Laura Metzger                                               Its:  Vice President
“Tenant”	XENCOR, INC., a Delaware corporation By:  /s/ Bassil Dahiyat                                               Name:  Bassil Dahiyat                                               Title:  President and CEO​ ​

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EXHIBIT “A”

DEPICTION OF LOBBY CONFIGURATION

4856-4214-1959.9 391226.00001/8-25-22/MLT/pah EXHIBIT “A” -1-

EXHIBIT B

EXISTING GENERATOR LOCATION

[See Attached]

4856-4214-1959.9 391226.00001/8-25-22/MLT/pah EXHIBIT B -1-

4856-4214-1959.9 391226.00001/8-25-22/MLT/pah EXHIBIT B -2-

EXHIBIT C

BILL OF SALE

THIS BILL OF SALE (“Bill of Sale”) is made this 2nd day of August, 2022, by AG-LC 465 NORTH HALSTEAD OWNER, L.P., a Delaware limited partnership (“Seller”) and XENCOR, INC., a Delaware corporation (“Buyer”).

W I T N E S S E T H:

For good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, Seller does hereby absolutely and unconditionally give, grant, bargain, sell, transfer, set over, assign, convey to Buyer all of the generator equipment described on Schedule “1” attached hereto (the “Generator Equipment”).

1.Seller represents and warrants to Buyer that Seller has good and marketable title to the Generator Equipment and that the Generator Equipment is not subject to any lien or security interest and is free of claims from third parties.

2.DISCLAIMER OF WARRANTIES. SELLER MAKES NO REPRESENTATION OR WARRANTY WHATSOEVER WITH RESPECT TO THE GENERATOR EQUIPMENT, INCLUDING ANY WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. BY ACCEPTING THIS BILL OF SALE, BUYER ACKNOWLEDGES THAT TENANT HAS NOT RELIED ON ANY REPRESENTATION OR WARRANTY MADE BY SELLER OR ANY OTHER PERSON ON SELLER’S BEHALF OTHER THAN AS EXPRESSLY SET FORTH IN THIS BILL OF SALE. BUYER ACKNOWLEDGES THAT THE GENERATOR EQUIPMENT IS SOLD IN ITS THEN “AS IS” CONDITION.

3.This Bill of Sale shall be binding upon and inure to the benefit of the successors, assigns, personal representatives, heirs and legatees of Buyer and Seller.

4.This Bill of Sale shall be governed by, interpreted under, and construed and enforceable in accordance with, the laws of the State of California.

[Signature Page Follows]

4856-4214-1959.9 391226.00001/8-25-22/MLT/pah EXHIBIT C -1-

IN WITNESS WHEREOF, Seller and Buyer have executed and delivered this Bill of Sale as of the date first written above.

“Seller” AG-LC 465 NORTH HALSTEAD OWNER, L.P., a Delaware limited partnership

By:  /s/ Laura Metzger​ ​​ ​

Name:  Laura Metzger​ ​​ ​

Title:  Vice President​ ​​ ​

“Buyer” XENCOR, INC., a Delaware corporation

By:  /s/ Bassil Dahiyat​ ​​ ​

Name:  Bassil Dahiyat  ​ ​​ ​

Title:  President and CEO​ ​​ ​

4856-4214-1959.9 391226.00001/8-25-22/MLT/pah EXHIBIT C -2-

SCHEDULE “1”

Generator Equipment

Caterpillar 500-kw diesel-powered generator with an automatic transfer switch.  Generator is supported by a 1,000-gallon fuel tank.  Model Number 3412C-DITA, Serial Number BPG00175.

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EXHIBIT D

PERMIT TO OPERATE

4856-4214-1959.9 391226.00001/8-25-22/MLT/pah EXHIBIT D -1-

4856-4214-1959.9 391226.00001/8-25-22/MLT/pah EXHIBIT D -2-

4856-4214-1959.9 391226.00001/8-25-22/MLT/pah EXHIBIT D -3-

4856-4214-1959.9 391226.00001/8-25-22/MLT/pah EXHIBIT D -4-

EXHIBIT E

LANDLORD’S HVAC EQUIPMENT

●(4) 80 ton fluid coolers serving turbocor compressors; 2 on pod A and 2 on pod B

●(4) 60 ton turbocor compressors; 2 on pod A and 2 on pod B

4856-4214-1959.9 391226.00001/8-25-22/MLT/pah EXHIBIT E -1-

EXHIBIT F

PROPOSED WORK

[See attached]

4856-4214-1959.9 391226.00001/8-25-22/MLT/pah EXHIBIT F -1-

4856-4214-1959.9 391226.00001/8-25-22/MLT/pah EXHIBIT F -2-

4856-4214-1959.9 391226.00001/8-25-22/MLT/pah EXHIBIT F -3-

EX-31.1

Exhibit 31.1

CERTIFICATION OF THE PRINCIPAL EXECUTIVE OFFICER PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Bassil I. Dahiyat, Ph.D., certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Xencor, Inc., (the “Company”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Company as of, and for, the periods presented in this report;

4. The Company’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Company and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Company, including its consolidated subsidiaries, is made known to us by others within those entities particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the Company’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the Company’s internal control over financial reporting that occurred during the Company’s most recent fiscal quarter (the Company’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting; and

5. The Company’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Company’s auditors and the audit committee of the Company’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Company’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the Company’s internal control over financial reporting.

	/s/ BASSIL I. DAHIYAT
	Bassil I. Dahiyat, Ph.D.
	President & Chief Executive Officer
	(Principal Executive Officer)
Date: November 7, 2022

EX-31.2

Exhibit 31.2

CERTIFICATION OF THE PRINCIPAL FINANCIAL OFFICER PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, John J. Kuch, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Xencor, Inc., (the “Company”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Company as of, and for, the periods presented in this report;

4. The Company’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Company and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the Company’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the Company’s internal control over financial reporting that occurred during the Company’s most recent fiscal quarter (the Company’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting; and

5. The Company’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Company’s auditors and the audit committee of the Company’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Company’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the Company’s internal control over financial reporting.

	/s/ JOHN J. KUCH
	John J. Kuch
	Chief Financial Officer (Principal Financial Officer)
Date: November 7, 2022

EX-32.1

Exhibit 32.1

CERTIFICATION

Pursuant to the requirement set forth in Rule 13a-14(b) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. §1350), Bassil I. Dahiyat, President & Chief Executive Officer of Xencor, Inc. (the “Company”), and John J. Kuch, Chief Financial Officer of the Company, each hereby certifies that, to the best of their knowledge:

1. The Company’s Quarterly Report on Form 10-Q for the period ended September 30, 2022, to which this Certification is attached as Exhibit 32.1 (the “Periodic Report”), fully complies with the requirements of Section 13(a) or Section 15(d) of the Exchange Act; and

2. The information contained in the Periodic Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: November 7, 2022

IN WITNESS WHEREOF, the undersigned have set their hands hereto as of the 7th day of November 2022.

/s/ BASSIL I. DAHIYAT	/s/ JOHN J. KUCH
Bassil I. Dahiyat	John J. Kuch
President & Chief Executive Officer	Chief Financial Officer
(Principal Executive Officer)	(Principal Financial Officer)

This certification accompanies the Periodic Report to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of Xencor, Inc. under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-Q), irrespective of any general incorporation language contained in such filing.

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2022	Nov. 03, 2022
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2022
Entity File Number	001-36182
Entity Registrant Name	Xencor Inc
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-1622502
Entity Address, Address Line One	111 West Lemon Avenue
Entity Address, City or Town	Monrovia
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	91016
City Area Code	626
Local Phone Number	305-5900
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	XNCR
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		59,924,016
Entity Central Index Key	0001326732
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3

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Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 52,654	$ 143,480
Marketable debt securities	515,398	153,767
Marketable equity securities	32,184	36,860
Accounts receivable	44,876	66,384
Prepaid expenses	22,886	23,877
Total current assets	667,998	424,368
Property and equipment, net	51,040	28,240
Patents, licenses, and other intangible assets, net	18,094	16,493
Marketable debt securities - long term	41,720	300,465
Marketable equity securities - long term	31,124	31,262
Notes receivable - long term	5,000	5,000
Right of use (ROU) asset	19,680	31,730
Other assets	613	653
Total assets	835,269	838,211
Current liabilities
Accounts payable	14,618	14,001
Accrued expenses	19,289	19,443
Lease liabilities	20,551
Deferred revenue	35,186	37,294
Income tax payable	388
Total current liabilities	90,032	70,738
Lease liabilities, net of current portion	22,539	33,969
Total liabilities	112,571	104,707
Commitments and contingencies
Stockholders' equity
Preferred stock, $0.01 par value: 10,000,000 authorized shares; -0- issued and outstanding shares at September 30, 2022 and December 31, 2021
Common stock, $0.01 par value: 200,000,000 authorized shares at September 30, 2022 and December 31, 2021; 59,773,337 issued and outstanding at September 30, 2022 and 59,355,558 issued and outstanding at December 31, 2021	598	595
Additional paid-in capital	1,058,219	1,017,523
Accumulated other comprehensive loss	(9,875)	(1,510)
Accumulated deficit	(326,244)	(283,104)
Total stockholders' equity	722,698	733,504
Total liabilities and stockholders' equity	$ 835,269	$ 838,211

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Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2022	Dec. 31, 2021
Balance Sheets
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	59,773,337	59,355,558
Common stock, shares outstanding	59,773,337	59,355,558

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Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue
Collaborations, milestones, and royalties	$ 27,299	$ 19,683	$ 142,969	$ 121,096
Operating expenses
Research and development	53,273	50,610	148,111	141,519
General and administrative	12,374	10,373	34,738	27,462
Total operating expenses	65,647	60,983	182,849	168,981
Loss from operations	(38,348)	(41,300)	(39,880)	(47,885)
Other income (expenses)
Interest income, net	1,379	196	2,749	558
Other expense, net	(1)	(593)	(244)	(610)
Gain (loss) on equity securities, net	5,299	1,506	(4,676)	57,507
Total other income (expense), net	6,677	1,109	(2,171)	57,455
Income (loss) before income tax expense	(31,671)	(40,191)	(42,051)	9,570
Income tax expense	1,088	0	1,088	0
Net income (loss)	(32,759)	(40,191)	(43,139)	9,570
Other comprehensive loss
Net unrealized loss on marketable debt securities	(931)	(59)	(8,366)	(149)
Comprehensive income (loss)	$ (33,690)	$ (40,250)	$ (51,505)	$ 9,421
Net income (loss) per share attributable to common stockholders:
Basic net income (loss) per common share (in dollars per share)	$ (0.55)	$ (0.69)	$ (0.72)	$ 0.16
Diluted net income (loss) per common share (in dollars per share)	$ (0.55)	$ (0.69)	$ (0.72)	$ 0.16
Weighted average shares used to compute net income (loss) per share attributable to common stockholders:
Basic (in shares)	59,716,594	58,350,647	59,564,985	58,199,928
Diluted (in shares)	59,716,594	58,350,647	59,564,985	60,346,480

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Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Total
Balance at Dec. 31, 2020	$ 580	$ 937,525	$ 74	$ (365,735)	$ 572,444
Balance (in shares) at Dec. 31, 2020	57,873,444
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of stock awards	$ 2	5,337			5,339
Issuance of common stock upon exercise of stock awards (in shares)	230,701
Issuance of restricted stock units	$ 1	(1)
Issuance of restricted stock units (in shares)	117,808
Comprehensive income (loss)			23	(2,487)	(2,464)
Stock-based compensation		8,293			8,293
Balance at Mar. 31, 2021	$ 583	951,154	97	(368,222)	583,612
Balance (in shares) at Mar. 31, 2021	58,221,953
Balance at Dec. 31, 2020	$ 580	937,525	74	(365,735)	572,444
Balance (in shares) at Dec. 31, 2020	57,873,444
Increase (Decrease) in Stockholders' Equity
Comprehensive income (loss)					9,421
Balance at Sep. 30, 2021	$ 585	974,514	(74)	(356,165)	618,860
Balance (in shares) at Sep. 30, 2021	58,454,811
Balance at Mar. 31, 2021	$ 583	951,154	97	(368,222)	583,612
Balance (in shares) at Mar. 31, 2021	58,221,953
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of stock awards	$ 1	902			903
Issuance of common stock upon exercise of stock awards (in shares)	52,790
Issuance of restricted stock units (in shares)	10,190
Issuance of common stock under the Employee Stock Purchase Plan		937			937
Issuance of common stock under the Employee Stock Purchase Plan (in shares)	30,552
Comprehensive income (loss)			(112)	52,248	52,136
Stock-based compensation		9,350			9,350
Balance at Jun. 30, 2021	$ 584	962,343	(15)	(315,974)	646,938
Balance (in shares) at Jun. 30, 2021	58,315,485
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of stock awards	$ 1	3,228			3,229
Issuance of common stock upon exercise of stock awards (in shares)	132,709
Issuance of restricted stock units (in shares)	6,617
Comprehensive income (loss)			(59)	(40,191)	(40,250)
Stock-based compensation		8,943			8,943
Balance at Sep. 30, 2021	$ 585	974,514	(74)	(356,165)	618,860
Balance (in shares) at Sep. 30, 2021	58,454,811
Balance at Dec. 31, 2021	$ 595	1,017,523	(1,510)	(283,104)	733,504
Balance (in shares) at Dec. 31, 2021	59,355,558
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of stock awards		731			731
Issuance of common stock upon exercise of stock awards (in shares)	36,500
Issuance of restricted stock units	$ 1	(1)
Issuance of restricted stock units (in shares)	137,134
Comprehensive income (loss)			(5,611)	23,594	17,983
Stock-based compensation		10,805			10,805
Balance at Mar. 31, 2022	$ 596	1,029,058	(7,121)	(259,510)	763,023
Balance (in shares) at Mar. 31, 2022	59,529,192
Balance at Dec. 31, 2021	$ 595	1,017,523	(1,510)	(283,104)	733,504
Balance (in shares) at Dec. 31, 2021	59,355,558
Increase (Decrease) in Stockholders' Equity
Comprehensive income (loss)					(51,505)
Balance at Sep. 30, 2022	$ 598	1,058,219	(9,875)	(326,244)	722,698
Balance (in shares) at Sep. 30, 2022	59,773,337
Balance at Mar. 31, 2022	$ 596	1,029,058	(7,121)	(259,510)	763,023
Balance (in shares) at Mar. 31, 2022	59,529,192
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of stock awards	$ 1	1,315			1,316
Issuance of common stock upon exercise of stock awards (in shares)	70,874
Issuance of restricted stock units (in shares)	15,774
Issuance of common stock under the Employee Stock Purchase Plan	$ 1	1,196			1,197
Issuance of common stock under the Employee Stock Purchase Plan (in shares)	68,580
Comprehensive income (loss)			(1,823)	(33,975)	(35,798)
Stock-based compensation		12,603			12,603
Balance at Jun. 30, 2022	$ 598	1,044,172	(8,944)	(293,485)	742,341
Balance (in shares) at Jun. 30, 2022	59,684,420
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of stock awards		1,287			1,287
Issuance of common stock upon exercise of stock awards (in shares)	71,530
Issuance of restricted stock units (in shares)	17,387
Comprehensive income (loss)			(931)	(32,759)	(33,690)
Stock-based compensation		12,760			12,760
Balance at Sep. 30, 2022	$ 598	$ 1,058,219	$ (9,875)	$ (326,244)	$ 722,698
Balance (in shares) at Sep. 30, 2022	59,773,337

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Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities
Net (loss) income	$ (43,139)	$ 9,570
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation and amortization	6,640	5,384
Amortization of premium on marketable securities	909	2,632
Stock-based compensation	36,168	26,586
Abandonment of capitalized intangible assets	1,331	727
Equity received in connection with sale of financial assets		(3,300)
Change in fair value of equity securities	4,676	(39,206)
Impairment on equity securities	138	563
Loss on disposal of assets	132	17
Changes in operating assets and liabilities:
Accounts receivable and contract asset	21,508	3,398
Interest receivable from marketable debt securities	(392)	182
Prepaid expenses and other assets	1,031	(10,599)
Accounts payable	617	177
Accrued expenses	(154)	4,505
Income taxes	388
Lease liabilities and ROU assets	21,171	386
Deferred revenue	(2,108)	(79,665)
Net cash provided by (used in) operating activities	48,916	(78,643)
Cash flows from investing activities
Purchase of marketable securities	(317,058)	(387,826)
Purchase of equity securities		(842)
Proceeds from sale of property and equipment		4
Purchase of intangible assets	(3,977)	(2,348)
Purchase of property and equipment	(28,528)	(6,979)
Proceeds from maturities and sale of marketable securities	205,290	343,882
Net cash used in investing activities	(144,273)	(54,109)
Cash flows from financing activities
Proceeds from issuance of common stock upon exercise of stock awards	3,334	9,471
Proceeds from issuance of common stock from Employee Stock Purchase Plan	1,197	937
Net cash provided by financing activities	4,531	10,408
Net decrease in cash and cash equivalents	(90,826)	(122,344)
Cash and cash equivalents, beginning of period	143,480	163,544
Cash and cash equivalents, end of period	52,654	41,200
Cash paid for:
Interest	13	13
Income taxes	72
Supplemental disclosures of non-cash investing activities
Unrealized loss on marketable securities	$ (8,366)	$ (149)

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Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2022

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

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 2021 Annual Report on Form 10-K filed with the Securities and Exchange Commission (SEC) on February 24, 2022.

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, evaluation of intangible assets, investments, leases and other assets for evidence of impairment, fair value measurements, and contingencies. Significant estimates in these interim financial statements include estimates made for royalty revenue, accrued research and development expenses, stock-based compensation expenses, intangible assets, incremental borrowing rate for right-of-use asset and lease liability, estimated standalone selling price of performance obligations, estimated time for completing delivery of performance obligations under certain arrangements, the likelihood of recognizing variable consideration, the carrying value of equity instruments without a readily determinable fair value, 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 was no impairment charge recorded for the three and nine months ended September 30, 2022. During the three and nine months ended September 30, 2021, the Company recorded an impairment charge of $0.4 million related to an acquired license.

The Company capitalizes certain in-process intangible assets that are then abandoned when they are no longer pursued or used in current research activities. We abandoned $0.3 million and $1.3 million of in-process intangible assets during the three and nine months ended September 30, 2022, respectively. There was no material abandonment of in-process intangible assets during the three months ended September 30, 2021. We abandoned $0.3 million of in-process intangible assets during the nine months ended September 30, 2021.

Marketable Debt 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.

The Company considers its marketable debt securities to be available-for-sale because it is not more likely than not that the Company will be required to sell the securities before recovery of the amortized cost. These assets are carried at fair value and any impairment losses and recoveries related to the underlying issuer’s credit standing are recognized within other income (expense), while non-credit related impairment losses and recoveries are recognized within accumulated other comprehensive income (loss). There were no impairment losses or recoveries recorded for the three and nine months ended September 30, 2022 and 2021. Accrued interest on marketable debt securities is included in the 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. During the three and nine months ended September 30, 2022, the Company recorded an unrealized loss of $0.9 million and $8.4 million, respectively, in its portfolio of marketable debt securities. The unrealized losses are due to the changing interest rate environment and are not due to changes in the credit quality of the underlying securities. The unrealized losses are recorded in other comprehensive income (loss) for the three and nine months ended September 30, 2022.

The Company receives equity securities in connection with certain licensing transactions with its partners. These investments in equity securities 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 gain or loss on the sale of the securities will be recognized within other income (expense) in the Statements of Comprehensive Income (Loss) in the period of sale.

The Company also has investments in equity securities without a readily determinable fair value, where the Company elects the measurement alternative to record the investment 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. There was no impairment charge recorded for the three months ended September 30, 2022. During the nine months ended September 30, 2022, the Company recorded an impairment charge of $0.1 million in connection with equity securities without a readily determinable fair value. During the three and nine months ended September 30, 2021, the Company recorded an impairment charge of $0.6 million.

Recent Accounting Pronouncements

Pronouncements Not Yet Effective

In June 2022, the Financial Accounting Standards Board (FASB) issued ASU No. 2022-03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions, which is effective for fiscal years beginning on and after December 15, 2023, and interim periods within those fiscal years. The standard clarifies that a contractual restriction on the sale of an equity security is not considered part of the unit of account of the equity security and is not considered in measuring fair value. The Company does not anticipate that the standard will have a significant impact on its financial statements.

There have been no other material changes to the significant accounting policies previously disclosed in the Company’s 2021 Annual Report on Form 10-K.

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Fair Value of Financial Instruments

9 Months Ended

Sep. 30, 2022

Fair Value of Financial Instruments

Fair Value of Financial Instruments

2. Fair Value of Financial Instruments

Financial instruments included in the financial statements include cash and cash equivalents, marketable debt and equity securities, accounts receivable, accounts payable, and accrued expenses. Marketable debt securities, equity 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 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 is determined by using unadjusted quoted prices that are available in active markets for identical assets or liabilities.

Level 2—Fair 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):

	September 30, 2022
	(unaudited)						December 31, 2021
	Total						Total
	Fair Value		Level 1		Level 2		Fair Value		Level 1		Level 2
Money Market Funds	$	24,506	$	24,506	$	—	$	123,892	$	123,892	$	—
Corporate Securities		186,597		—		186,597		144,418		—		144,418
Government Securities		370,521		—		370,521		309,814		—		309,814
	$	581,624	$	24,506	$	557,118	$	578,124	$	123,892	$	454,232

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 and nine months ended September 30, 2022 and 2021, there were no transfers between Level 1 and Level 2.

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Net Income (Loss) Per Common Share

9 Months Ended

Sep. 30, 2022

Net Income (Loss) Per Common Share

Net Income (Loss) Per Common Share

3. Net Income (Loss) Per Common Share

Basic net income (loss) per common share is computed by dividing the net income (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) per common share is computed by dividing the net income (loss) attributable to common stockholders by the weighted-average number of common stock equivalents outstanding for the period. Potentially dilutive securities consisting of stock issuable pursuant to outstanding options and restricted stock units (RSUs), and stock issuable pursuant to the 2013 Employee Stock Purchase Plan (ESPP) are not included in the per common share calculation in periods when the inclusion of such shares would have an anti-dilutive effect.

Basic and diluted net income (loss) per common share is computed as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(in thousands, except share and per share data)				(in thousands, except share and per share data)
Numerator:
Net income (loss) attributable to common stockholders	$	(32,759)	$	(40,191)	$	(43,139)	$	9,570
Denominator:
Weighted-average common shares outstanding used in computing basic net income (loss)		59,716,594		58,350,647		59,564,985		58,199,928
Effect of dilutive securities		—		—		—		2,146,552
Weighted-average common shares outstanding used in computing diluted net income (loss)		59,716,594		58,350,647		59,564,985		60,346,480
Basic net income (loss) per common share	$	(0.55)	$	(0.69)	$	(0.72)	$	0.16
Diluted net income (loss) per common share	$	(0.55)	$	(0.69)	$	(0.72)	$	0.16

For the three and nine months ended September 30, 2022 and three months ended September 30, 2021, we excluded all shares of stock issuable pursuant to outstanding options and RSUs from the calculation, because the inclusion of such shares would have had an anti-dilutive effect. For the nine months ended September 30, 2021, we excluded 1,139,403 shares of stock issuable pursuant to outstanding options and RSUs from the calculation, because the inclusion of such shares would have had an anti-dilutive effect.

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Comprehensive Income (Loss)

9 Months Ended

Sep. 30, 2022

Comprehensive Income (Loss)

Comprehensive Income (Loss)

4. Comprehensive Income (Loss)

Comprehensive income (loss) is comprised of net income (loss) and other comprehensive income (loss). For each of the three- and nine-month periods ended September 30, 2022 and 2021, the only component of other comprehensive loss is net unrealized loss on marketable debt securities. There were no material reclassifications out of accumulated other comprehensive loss during each of the three- and nine-month periods ended September 30, 2022 and 2021.

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Marketable Debt and Equity Securities

9 Months Ended

Sep. 30, 2022

Marketable Debt and Equity Securities

Marketable Debt and Equity Securities

5. Marketable Debt and Equity Securities

The Company’s marketable debt securities held as of September 30, 2022 and December 31, 2021 are summarized below:

			Gross		Gross
	Amortized		Unrealized		Unrealized
September 30, 2022	Cost		Gains		Losses		Fair Value
(in thousands)
Money Market Funds	$	24,506	$	—	$	—	$	24,506
Corporate Securities		188,360		—		(1,763)		186,597
Government Securities		378,623		—		(8,102)		370,521
	$	591,489	$	—	$	(9,865)	$	581,624
Reported as
Cash and cash equivalents							$	24,506
Marketable securities								557,118
Total investments							$	581,624
			Gross		Gross
	Amortized		Unrealized		Unrealized
December 31, 2021	Cost		Gains		Losses		Fair Value
(in thousands)
Money Market Funds	$	123,892	$	—	$	—	$	123,892
Corporate Securities		144,584		—		(166)		144,418
Government Securities		311,148		1		(1,335)		309,814
	$	579,624	$	1	$	(1,501)	$	578,124
Reported as
Cash and cash equivalents							$	123,892
Marketable securities								454,232
Total investments							$	578,124

The maturities of the Company’s marketable debt securities as of September 30, 2022 are as follows:

	Amortized		Estimated
September 30, 2022	Cost		Fair Value
(in thousands)
Mature in one year or less	$	523,629	$	515,398
Mature within two years		43,354		41,720
	$	566,983	$	557,118

The unrealized losses on available-for-sale investments and their related fair values as of September 30, 2022 and December 31, 2021 are as follows:

	Less than 12 months				12 months or greater
			Unrealized				Unrealized
September 30, 2022	Fair value		losses		Fair value		losses
(in thousands)
Corporate Securities	$	143,625	$	(1,649)	$	2,880	$	(114)
Government Securities		331,407		(6,582)		38,840		(1,520)
	$	475,032	$	(8,231)	$	41,720	$	(1,634)
	Less than 12 months				12 months or greater
			Unrealized				Unrealized
December 31, 2021	Fair value		losses		Fair value		losses
(in thousands)
Corporate Securities	$	50,337	$	(51)	$	45,872	$	(115)
Government Securities		39,909		(54)		254,593		(1,281)
	$	90,246	$	(105)	$	300,465	$	(1,396)

The unrealized losses from the available-for-sale securities are primarily due to changes in the interest rate environment and not changes in the credit quality of the underlying securities in the portfolio.

The Company’s equity securities include securities with a readily determinable fair value. These investments are carried at fair value with changes in fair value recognized each period and reported within other income (expense). For the three and nine months ended September 30, 2022, a gain of $5.3 million and a loss of $4.7 million, respectively, were recorded under other income (expense) related to these securities. Equity securities with a readily determinable fair value, which are categorized as Level 1 in the fair value hierarchy under ASC 820, and their fair values (in thousands) as of September 30, 2022 and December 31, 2021 are as follows:

	Fair Value		Fair Value
	September 30, 2022		December 31, 2021
Astria Common Stock	$	5,785	$	3,449
INmune Common Stock		11,690		19,233
Viridian Common Stock		14,709		14,178
	$	32,184	$	36,860

The Company also has investments in equity securities without a readily determinable fair value. The Company elects the measurement alternative to record these investments at their initial cost and evaluate such investments at each reporting period for evidence of impairment, or observable price changes in orderly transactions for the identical or a similar investment of the same issuer. Equity securities without a readily determinable fair value and their carrying values (in thousands) as of September 30, 2022 and December 31, 2021 are as follows:

	Carrying Value		Carrying Value
	September 30, 2022		December 31, 2021
Astria Preferred Stock	$	174	$	312
Zenas Preferred Stock		30,950		30,950
	$	31,124	$	31,262

In 2018, the Company received equity shares in Quellis Biosciences, Inc. (Quellis) in connection with a licensing transaction. In 2021, Quellis merged into Astria Therapeutics, Inc. (Astria) (formerly Catabasis Pharmaceuticals, Inc.), and the Company received common and preferred stock in Astria in exchange for its Quellis equity. The shares of Astria common stock have a readily determinable fair value. The adjustment in the fair value of the Astria common stock has been recorded as a gain in equity securities for the three and nine months ended September 30, 2022.

The Company records its investment in the shares of Astria preferred stock as an equity interest without a readily determinable fair value. The Company elected to record the shares of preferred stock at their initial cost and to review the carrying value for impairment or other changes in carrying value at each reporting period. During the nine months ended September 30, 2022, the Company recorded an impairment charge of $0.1 million related to its investment in Astria’s preferred stock.

The Company currently holds 1,885,533 shares of common stock of INmune Bio, Inc. (INmune). The 1,885,533 shares of INmune common stock are classified as equity securities with a readily determinable fair value, and the adjustment in the fair value of the shares of INmune common stock has been recorded as a loss in equity securities for the three and nine months ended September 30, 2022.

The Company currently holds 717,144 shares of common stock of Viridian Therapeutics, Inc. (Viridian). The shares of Viridian common stock are classified as equity securities with a readily determinable fair value, and the adjustment in the fair value of the shares of Viridian common stock was recorded as a gain in equity securities for the three and nine months ended September 30, 2022.

The Company currently holds an equity interest in Zenas BioPharma Limited (Zenas), a private biotechnology company. The Company’s equity interests include preferred stock in Zenas and a warrant to acquire additional equity in Zenas in a subsequent financing. The Company also holds a convertible promissory note from Zenas. The Company elected the measurement alternative to carry the Zenas equity and the warrant 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. During the three and nine months ended September 30, 2022, there has not been any impairment or observable price changes related to this investment.

Unrealized (loss) gain recognized on equity securities during each of the three- and nine-month periods ended September 30, 2022 and 2021, consist of the following:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Net gain (loss) recognized on equity securities	$	5,299	$	1,506	$	(4,676)	$	57,507
Less: net gain recognized on sale of equity securities		—		—		—		(18,301)
Unrealized gain (loss) recognized on equity securities	$	5,299	$	1,506	$	(4,676)	$	39,206

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Stock-Based Compensation

9 Months Ended

Sep. 30, 2022

Stock-Based Compensation

Stock-Based Compensation

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 no 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 September 30, 2022, the total number of shares of common stock available for issuance under the 2013 Plan is 14,974,396. 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 immediately preceding year. Pursuant to approval by the Board, the total number of shares of common stock available for issuance under the 2013 Plan was increased by 2,374,222 shares on January 1, 2022. As of September 30, 2022, a total of 14,407,906 options have been granted under the 2013 Plan.

In November 2013, the Board and our stockholders approved the ESPP, which became effective as of December 5, 2013. As of September 30, 2022, the total number of shares of common stock available for issuance under the ESPP is 576,409. 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 the Board, the total number of shares of common stock available for issuance under the ESPP was increased by 593,555 shares on January 1, 2022. As of September 30, 2022, we have issued a total of 598,432 shares of common stock under the ESPP.

During the nine months ended September 30, 2022, the Company awarded 809,630 RSUs to certain employees. The standard vesting of these awards is generally in three equal annual installments and is contingent on an employee’s 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 September 30, 2022, a total of 1,934,117 RSUs have been granted under the 2013 Plan.

Total employee, director and non-employee stock-based compensation expense recognized for the three months ended September 30, 2022 and 2021 are as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
General and administrative	$	4,736	$	3,370	$	12,760	$	9,300
Research and development		8,024		5,573		23,408		17,286
	$	12,760	$	8,943	$	36,168	$	26,586
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Stock options	$	7,833	$	6,959	$	22,178	$	20,844
ESPP		282		265		873		766
RSUs		4,645		1,719		13,117		4,976
	$	12,760	$	8,943	$	36,168	$	26,586

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, 2021	8,676,329	$	29.11		6.65	$	100,057
Options granted	2,007,833	$	29.58
Options forfeited	(440,882)	$	33.77
Options exercised	(178,904)	$	18.64
Balance at September 30, 2022	10,064,376	$	29.18		6.51	$	27,085
Exercisable	6,401,896	$	26.57		5.21	$	26,936

We calculate the intrinsic value as the difference between the exercise price of the options and the closing price of common stock of $25.98 per share as of September 30, 2022.

The weighted-average fair value of options granted during the nine-month periods ended September 30, 2022 and 2021 were $15.50 and $21.96 per share, respectively. There were 1,662,574 options granted during the nine-month period ended September 30, 2021. 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 and nine months ended September 30, 2022 and 2021:

	Options				Options
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Expected term (years)	6.1		6.0		6.3		6.2
Expected volatility	51.9	%	55.6	%	53.0	%	55.6	%
Risk-free interest rate	3.38	%	0.88	%	2.02	%	1.00	%
Expected dividend yield	—	%	—	%	—	%	—	%

	ESPP				ESPP
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Expected term (years)	0.5 - 2.0		0.5 - 2.0		0.5 - 2.0		0.5 - 2.0
Expected volatility	43.2 - 55.7	%	46.1 - 66.4	%	43.2 - 55.7	%	46.1 - 66.4	%
Risk-free interest rate	0.13 - 2.82	%	0.04 - 1.65	%	0.13 - 2.82	%	0.04 - 1.65	%
Expected dividend yield	—	%	—	%	—	%	—	%

As of September 30, 2022, the unamortized compensation expense related to unvested stock options was $59.1 million. The remaining unamortized compensation expense will be recognized over the next 2.5 years. As of September 30, 2022, the unamortized compensation expense under our ESPP was $1.4 million. The remaining unamortized expense will be recognized over the next 1.2 years.

The following table summarizes the RSU activity for the nine-month period ended September 30, 2022:

		Weighted
	Restricted	Average Grant
	Stock	Date Fair Value
	Units	(Per unit)
Unvested RSUs at December 31, 2021	826,148	$	37.79
Granted	809,630		29.61
Vested	(170,295)		37.42
Forfeited	(108,076)		33.65
Unvested RSUs at September 30, 2022	1,357,407	$	33.28

As of September 30, 2022, the unamortized compensation expense related to unvested RSUs was $32.0 million. The remaining unamortized expense will be recognized over the next 2.0 years.

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Leases

9 Months Ended

Sep. 30, 2022

Leases

Leases

7. Leases

The Company leases office and laboratory space in Monrovia, California under a lease that expires in December 2025 with an option to renew for an additional five years at then market rates. The Company has assessed that it is unlikely to exercise the option to extend the lease term. In July 2017, under a separate agreement, the Company entered into a lease for additional space in the same building with a lease that continues through September 2022. The lease contained an option to renew for additional lease term and the option period has lapsed. In October 2022, the Company entered into an amendment to extend the lease under existing terms through January 31, 2023. For the three and nine months ended September 30, 2022, ROU assets obtained in exchange for new operating lease liabilities are $0.3 million.

In June 2021, the Company entered into an Agreement of Lease (Lease Agreement) for laboratory and office space in Pasadena, California, which will expire in July 2035. The Lease Agreement provides for two separate phases of lease and occupancy. The first phase commences on August 1, 2022 and provides the Company with an improvement allowance up to $17.0 million. The second phase of the lease agreement will commence no later than September 30, 2026 and includes an additional improvement allowance up to $3.3 million. In August 2022, the Company entered into an amendment, which the Company would receive an additional $5.0 million in tenant improvement allowance in exchange for an increase in the rental rate of the phase 1 space. For the three and nine months ended September 30, 2022, ROU assets obtained in exchange for new operating lease liabilities are $11.4 million.

The Company leases additional office space in San Diego, California through August 2022. In May 2022, the Company extended the term of the lease through December 2023. For the nine months ended September 30, 2022, ROU assets obtained in exchange for new operating lease liabilities are $1.5 million.

The Company also leases additional office space in Monrovia, California under a lease that extends through January 2023, with an option to extend for an additional two years. The Company has assessed 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.

The following table reconciles the undiscounted cash flows for the operating leases at September 30, 2022 to the operating lease liabilities recorded on the balance sheet (in thousands):

Years ending December 31,
For the remainder of 2022	$	727
2023		7,251
2024		6,072
2025		6,176
2026		5,638
2027		5,791
Thereafter		49,407
Total undiscounted lease payments		81,062
Less: Tenant allowance		(3,489)
Less: Imputed interest		(34,483)
Present value of lease payments	$	43,090
Lease liabilities - short-term	$	20,551
Lease liabilities - long-term		22,539
Total lease liabilities	$	43,090

The following table summarizes lease costs and cash payments for the three and nine months ended September 30, 2022 and 2021 (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Operating lease cost	$	1,589	$	1,553	$	4,725	$	2,780
Variable lease cost		156		16		287		44
Total lease costs	$	1,745	$	1,569	$	5,012	$	2,824
Cash paid for amounts included in
the measurement of lease liabilities	$	564	$	1,034	$	1,913	$	2,081

As of September 30, 2022, the weighted-average remaining lease term for operating leases is 11.9 years, and the weighted-average discount rate for operating leases is 9.1%. As of September 30, 2021, the weighted-average remaining lease term for operating leases is 12.3 years, and the weighted-average discount rate for operating leases is 5.7%.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2022

Commitments and Contingencies

Commitments and Contingencies

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 that will require us to make future payments upon the delivery of goods and services in future periods.

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Collaboration and Licensing Agreements

9 Months Ended

Sep. 30, 2022

Collaboration and Licensing Agreements

Collaboration and Licensing Agreements

9. Collaboration and Licensing Agreements

The following is a summary description of the material revenue arrangements, including arrangements that generated revenue in the three and nine months ended September 30, 2022 and 2021.

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 one target program, ALXN1210, which is now marketed as Ultomiris®.

The Company is eligible to receive a contractual milestone 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.

Under ASC 606, Revenue from Contracts with Customers, the Company recognizes revenue for sales-based royalties upon the subsequent sale of the product. The Company recognized $7.3 million and $5.8 million of royalty revenue under this arrangement for the three months ended September 30, 2022 and 2021, respectively. The Company recognized $20.2 million and $16.4 million of royalty revenue under this arrangement for the nine months ended September 30, 2022 and 2021, respectively. As of September 30, 2022, there is a receivable of $12.5 million related to royalties due under the arrangement, and there is no deferred revenue related to this agreement.

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, Amgen applied our bispecific Fc technology to create AMG 509, a STEAP1 x CD3 XmAb 2+1 bispecific antibody, which is currently being developed by Amgen in a Phase 1 study.

No revenue was recognized under the Amgen Agreement during the three and nine months ended September 30, 2022 or 2021, and there is no 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 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.

Under the Astellas Agreement, Astellas developed ASP2138, a CLDN18.2 x CD3 bispecific antibody, which is currently being developed by Astellas in a Phase 1 study.

At March 31, 2022, the Company recorded a contract asset of $5.0 million related to a future development milestone under the Astellas Agreement, and we received the milestone payment in July 2022.

The Company recognized $5.0 million of revenue for the nine months ended September 30, 2022; no revenue was recognized related to the arrangement for the three months ended September 30, 2022, and 2021, or the nine months ended September 30, 2021. As of September 30, 2022, there is no deferred revenue related to the arrangement.

Astria Therapeutics, 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 development, regulatory and sales milestones, and royalties in the mid-single digit percentage range on net sales of approved products.

In January 2021, Quellis merged into Astria (formerly Catabasis), and the Company received common stock and preferred stock of Astria 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 was recorded as unrealized gain for the three months ended September 30, 2021. The Astria preferred stock is carried at its original cost and is reviewed for impairment or other changes at each reporting period.

The Company recognized an unrealized gain of $3.9 million and $2.3 million related to its equity interest in Astria for the three and nine months ended September 30, 2022, respectively. The Company recognized an unrealized loss of $2.4 million and an unrealized gain of $6.7 million related to its equity interest in Astria for the three and nine months ended September 30, 2021, respectively. There is no deferred revenue as of September 30, 2022 related to this agreement.

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. Hoffmann-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.

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%.

Pursuant to the Genentech Agreement, the Company and Genentech conducted 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 expired in March 2021. The Company is eligible for clinical milestone payments for new Collaboration Products identified from the research efforts.

The Company did not recognize revenue related to the Genentech Agreement for the three and nine months ended September 30, 2022, or the three months ended September 30, 2021. For the nine months ended September 30, 2021, the Company recognized $2.5 million of revenue. As of September 30, 2022, there is a $3.2 million payable related to cost-sharing development activities during the second quarter of 2022 for development studies being conducted under the Genentech Agreement. There is no deferred revenue as of September 30, 2022, as obligations to perform research activities have expired.

INmune Bio, Inc.

In October 2017, the Company entered into a License Agreement (the INmune Agreement) with 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 shares of INmune common stock.

During the three months ended September 30, 2021, the Company determined that it should no longer record its investment in INmune under the equity method and recorded its investment in INmune pursuant to ASC 321.

For the three and nine months ended September 30, 2022, the Company recorded an unrealized loss of $5.0 million and $7.5 million, respectively, related to its investment in INmune. For the three months ended September 30, 2021, the Company recorded $4.5 million of unrealized gain. For the nine months ended September 30, 2021, the Company recognized an unrealized gain of $32.5 million and a realized gain of $18.3 million.

Janssen Biotech, Inc.

Janssen Agreement

In November 2020, the Company entered into a Collaboration and License Agreement (the Janssen Agreement) with Janssen Biotech, Inc. (Janssen) pursuant to which the Company and Janssen conducted research and development activities to discover novel CD28 bispecific antibodies for the treatment of prostate cancer with Janssen maintaining exclusive worldwide rights to develop and commercialize licensed products identified from the research activities.

Under the Janssen Agreement, the Company conducted research activities and applied its bispecific Fc technology to antibodies targeting prostate cancer provided by Janssen. Upon completion of the research activities Janssen had a candidate selection option to advance an identified candidate for development and commercialization. In November 2021, the Company completed its performance obligations under the research activities and delivered CD28 bispecific antibodies to Janssen, and Janssen exercised its candidate selection option to select a bispecific CD28 antibody for further development. Janssen will assume full responsibility for development and commercialization of the CD28 bispecific antibody candidate.

Second Janssen Agreement

On October 1, 2021, the Company entered into a second Collaboration and License Agreement (the Second Janssen Agreement) with Janssen pursuant to which the Company granted Janssen an exclusive worldwide license to develop, manufacture, and commercialize plamotamab, the Company’s CD20 x CD3 development candidate, and pursuant to which Xencor and Janssen will conduct research and development activities to discover novel CD28 bispecific antibodies. The parties will conduct joint research activities for up to a two-year period to discover XmAb bispecific antibodies against CD28 and undisclosed B cell tumor-targets with Janssen receiving exclusive worldwide rights, subject to certain Xencor opt-in rights, to develop, manufacture and commercialize pharmaceutical products that contain one or more of such discovered antibodies (CD28 Licensed Antibodies). The Agreement became effective on November 5, 2021.

Pursuant to the Second Janssen Agreement, the Company received an upfront payment of $100.0 million and is eligible to receive up to $1,187.5 million in milestones which include $289.4 million in development milestones, $378.1 million in regulatory milestones and $520.0 million in sales milestones. Under the terms of the Stock Purchase Agreement, Johnson & Johnson Innovation, JJDC, Inc. (JJDC), agreed to purchase $25.0 million of newly issued unregistered shares of the Company’s common stock, priced at a 30-day volume-weighted average price of $33.4197 per share as of October 1, 2021. The Company issued JJDC 748,062 shares of its common stock which had a fair market value of $28.9 million when the shares were transferred.

The Company will collaborate with Janssen on further clinical development of plamotamab with Janssen and share development costs with Janssen paying 80% and the Company paying 20% of certain development costs.

The Company is generally responsible for conducting research activities under the Second Janssen Agreement, and Janssen is generally responsible for all development, manufacturing, and commercialization activities for CD28 Licensed Antibodies that are advanced.

There is a receivable of $3.7 million as of September 30, 2022, related to cost-sharing activities for development of plamotamab under the Second Janssen Agreement. The Company recognized $0.1 million and $6.3 million of revenue related to the two Janssen agreements for the three months ended September 30, 2022 and 2021, respectively. The Company recognized $2.1 million and $37.0 million of revenue related to the two Janssen agreements for the nine months ended September 30, 2022, and 2021, respectively, and there is $35.2 million in deferred revenue as of September 30, 2022 related to the Second Janssen 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.

The Company recognized $2.1 million and $1.3 million of royalty revenue during the three months ended September 30, 2022 and 2021, respectively. The Company recognized $5.6 million and $16.4 million of revenue during the nine months ended September 30, 2022 and 2021, respectively. As of September 30, 2022, there is a receivable of $2.0 million related to estimated royalties due under the arrangement. As of September 30, 2022, there is no deferred revenue related to this agreement.

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.

Pursuant to the Novartis Agreement, the Company and Novartis were co-developing vibecotamab worldwide and sharing development costs. In August 2021, Novartis notified the Company it was terminating its rights with respect to the vibecotamab program, which became effective in February 2022. Under the Novartis Agreement, Novartis is responsible for its share of vibecotamab development costs through February 2023.

In June 2021, Novartis selected an Fc candidate and received a non-exclusive license to the Company’s Fc technology. Novartis will assume full responsibility for development and commercialization of the licensed Fc product candidate. The Company is eligible to receive development, clinical, and sales milestones and royalties on net sales of approved products for the licensed Fc candidate.

No revenue was recognized during the three and nine months ended September 30, 2022, or the three months ended September 30, 2021, from the Novartis Agreement. The Company recognized $41.1 million of revenue during the nine months ended September 30, 2021. As of September 30, 2022, there is a receivable of $0.3 million related to cost-sharing of development activities for the third quarter of 2022 for the vibecotamab program, and there is no deferred revenue as of September 30, 2022.

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 two targets.

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 two novel antibodies that 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. In May 2021, the FDA granted emergency use authorization (EUA) to Vir’s COVID-19 antibody, sotrovimab (VIR-7831), for the treatment of mild-to-moderate COVID-19 in high-risk adults and patients.

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 each case, pursuant to 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, respectively. 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 recognized $17.8 million and $110.1 million of royalty revenue for the three and nine months ended September 30, 2022, respectively. The Company recognized $6.3 million and $7.7 million of revenue for the three and nine months ended September 30, 2021, respectively. As of September 30, 2022, there is a receivable of $17.8 million related to estimated royalty due under this agreement, and there is no deferred revenue related to this agreement.

Viridian Therapeutics, Inc.

In December 2020, the Company entered into a Technology License Agreement (Viridian Agreement) with Viridian, 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 and is eligible to receive development, regulatory and sales milestones, and royalties on net sales in the mid-single digit percentage range.

In December 2021, the Company entered into a second Technology License Agreement (Second Viridian Agreement) with Viridian for a non-exclusive license to certain antibody libraries developed by the Company. Under the Second Viridian Agreement, Viridian received a one-year research license to review the antibodies and the right to select up to three antibodies for further development. Viridian is responsible for all further development of the selected antibodies. The Company received an upfront payment and is eligible to receive development, regulatory and sales milestones, in addition to royalties on net sales of approved products under the Second Viridian Agreement.

In connection with the Viridian Agreement and the Second Viridian Agreement, the Company received shares of Viridian common stock.

The Company reported unrealized gain of $6.4 million and $0.5 million for the three and nine months ended September 30, 2022 related to the shares of Viridian common stock. The Company reported unrealized loss of $0.6 million for the three months ended September 30, 2021. For the nine months ended September 30, 2021, there was no unrealized gain or loss related to the shares of Viridian common stock. The Company did not recognize revenue for the three and nine months ended September 30, 2022 or 2021. There is no deferred revenue as of September 30, 2022 related to this agreement.

Zenas BioPharma Limited

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 three preclinical-stage Fc-engineered drug candidates: XmAb6755, XPro9523, and XmAb10171. Under the Zenas Agreement, Zenas will be responsible for all further development and commercialization activities for the drug candidates. The Company received a 15% equity interest in Zenas with a fair value of $16.1 million and is eligible to receive royalties on net sales of approved products in the mid-single digit to mid-teen percentage range.

The equity in Zenas is recorded at the fair value as of the date of the Zenas Agreement and is reviewed each reporting period for impairment or other evidence of change in value.

In November 2021, the Company entered into a second License Agreement (Second Zenas Agreement) with Zenas, in which we licensed the exclusive worldwide rights to develop and commercialize the Company’s obexelimab (XmAb5871) drug candidate. Under the Second Zenas Agreement, Zenas will be responsible for all further development and commercialization activities for obexelimab. The Company received a warrant to acquire additional equity in Zenas and is eligible to receive development, regulatory and sales milestones, and royalties on net sales of approved products in the mid-single digit to mid-teen percentage range.

The warrant in Zenas is recorded at its fair value as of the date of the Second 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 or the warrant in Zenas in the three and nine months ended September 30, 2022 or 2021. The Company did not recognize any revenue related to the Zenas Agreement for the three and nine months ended September 30, 2022 or 2021, and there is no deferred revenue related to this agreement.

Revenue earned

The revenues recorded for the three and nine months ended September 30, 2022 and 2021 were earned principally from the following licensees (in millions):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Alexion	$	7.3	$	5.8	$	20.2	$	16.4
Astellas		—		—		5.0		—
Genentech		—		—		—		2.5
Janssen		0.1		6.3		2.1		37.0
MorphoSys		2.1		1.3		5.6		16.4
Novartis		—		—		—		41.1
Vir		17.8		6.3		110.1		7.7
Total	$	27.3	$	19.7	$	143.0	$	121.1

The table below summarizes the disaggregation of revenue recorded for the three and nine months ended September 30, 2022 and 2021 (in millions):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Research collaboration	$	0.1	$	6.3	$	2.1	$	79.7
Milestone		—		—		5.0		14.0
Royalties		27.2		13.4		135.9		27.4
Total	$	27.3	$	19.7	$	143.0	$	121.1

Remaining Performance Obligations and Deferred Revenue

The Company’s remaining performance obligation as of September 30, 2022 is conducting research activities pursuant to research plans under the Second Janssen Agreement. The Company’s obligation to perform research services under the Genentech and the Novartis Agreements ended upon expiration of the respective research terms for each agreement in the second quarter of 2021. As of September 30, 2022 and 2021, the Company has deferred revenue of $35.2 million and $13.0 million, respectively. All deferred revenue as of September 30, 2022 is classified as current liabilities as the Company’s obligations to perform services are due on demand when requested by Janssen under the Second Janssen Agreement.

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Income Taxes

9 Months Ended

Sep. 30, 2022

Income Taxes

Income Taxes

10. Income taxes

The provision for income tax for the three and nine months ended September 30, 2022 is $1.1 million. There was no provision for income tax for the three and nine months ended September 30, 2021. Beginning in 2022, the Tax Cuts and Jobs Act (TCJA) requires taxpayers to capitalize certain research and development costs and amortize them over five or fifteen years pursuant to Internal Revenue Code Section 174. Previously, such costs could be deducted in the period they were incurred. This provision may increase our taxable income for the tax year ended December 31, 2022 and subsequent years, and result in additional cash payments for our federal income taxes. As of September 30, 2022, 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.

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Subsequent Event

9 Months Ended

Sep. 30, 2022

Subsequent Event

Subsequent Event

11. Subsequent Event

In November 2022, Zenas closed on a Series B financing, pursuant to which a warrant to purchase Zenas equity that was held by the Company was automatically exercised, and a convertible note issued to the Company by Zenas was automatically converted with both converting into shares of Zenas’ Series B preferred stock. After the financing transaction, we will continue to record our investment in Zenas at fair value adjusted at each reporting period for impairment or other evidence of change in value. The equity shares in Zenas received from exercise of the warrant and conversion of the notes have an estimated fair value of $34.5 million and $7.7 million, respectively. As a result of the Zenas financing transaction, the estimated fair value of our investment in equity securities would increase by $17.9 million.

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Summary of Significant Accounting Policies (Polices)

9 Months Ended

Sep. 30, 2022

Summary of Significant Accounting Policies

Basis of Presentation

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 2021 Annual Report on Form 10-K filed with the Securities and Exchange Commission (SEC) on February 24, 2022.

Use of Estimates

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, evaluation of intangible assets, investments, leases and other assets for evidence of impairment, fair value measurements, and contingencies. Significant estimates in these interim financial statements include estimates made for royalty revenue, accrued research and development expenses, stock-based compensation expenses, intangible assets, incremental borrowing rate for right-of-use asset and lease liability, estimated standalone selling price of performance obligations, estimated time for completing delivery of performance obligations under certain arrangements, the likelihood of recognizing variable consideration, the carrying value of equity instruments without a readily determinable fair value, and recoverability of deferred tax assets.

Intangible 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 was no impairment charge recorded for the three and nine months ended September 30, 2022. During the three and nine months ended September 30, 2021, the Company recorded an impairment charge of $0.4 million related to an acquired license.

The Company capitalizes certain in-process intangible assets that are then abandoned when they are no longer pursued or used in current research activities. We abandoned $0.3 million and $1.3 million of in-process intangible assets during the three and nine months ended September 30, 2022, respectively. There was no material abandonment of in-process intangible assets during the three months ended September 30, 2021. We abandoned $0.3 million of in-process intangible assets during the nine months ended September 30, 2021.

Marketable Debt and Equity Securities

Marketable Debt 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.

The Company considers its marketable debt securities to be available-for-sale because it is not more likely than not that the Company will be required to sell the securities before recovery of the amortized cost. These assets are carried at fair value and any impairment losses and recoveries related to the underlying issuer’s credit standing are recognized within other income (expense), while non-credit related impairment losses and recoveries are recognized within accumulated other comprehensive income (loss). There were no impairment losses or recoveries recorded for the three and nine months ended September 30, 2022 and 2021. Accrued interest on marketable debt securities is included in the 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. During the three and nine months ended September 30, 2022, the Company recorded an unrealized loss of $0.9 million and $8.4 million, respectively, in its portfolio of marketable debt securities. The unrealized losses are due to the changing interest rate environment and are not due to changes in the credit quality of the underlying securities. The unrealized losses are recorded in other comprehensive income (loss) for the three and nine months ended September 30, 2022.

The Company receives equity securities in connection with certain licensing transactions with its partners. These investments in equity securities 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 gain or loss on the sale of the securities will be recognized within other income (expense) in the Statements of Comprehensive Income (Loss) in the period of sale.

The Company also has investments in equity securities without a readily determinable fair value, where the Company elects the measurement alternative to record the investment 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. There was no impairment charge recorded for the three months ended September 30, 2022. During the nine months ended September 30, 2022, the Company recorded an impairment charge of $0.1 million in connection with equity securities without a readily determinable fair value. During the three and nine months ended September 30, 2021, the Company recorded an impairment charge of $0.6 million.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Pronouncements Not Yet Effective

In June 2022, the Financial Accounting Standards Board (FASB) issued ASU No. 2022-03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions, which is effective for fiscal years beginning on and after December 15, 2023, and interim periods within those fiscal years. The standard clarifies that a contractual restriction on the sale of an equity security is not considered part of the unit of account of the equity security and is not considered in measuring fair value. The Company does not anticipate that the standard will have a significant impact on its financial statements.

There have been no other material changes to the significant accounting policies previously disclosed in the Company’s 2021 Annual Report on Form 10-K.

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Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2022

Fair Value of Financial Instruments

Schedule of assets recorded at fair value

	September 30, 2022
	(unaudited)						December 31, 2021
	Total						Total
	Fair Value		Level 1		Level 2		Fair Value		Level 1		Level 2
Money Market Funds	$	24,506	$	24,506	$	—	$	123,892	$	123,892	$	—
Corporate Securities		186,597		—		186,597		144,418		—		144,418
Government Securities		370,521		—		370,521		309,814		—		309,814
	$	581,624	$	24,506	$	557,118	$	578,124	$	123,892	$	454,232

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Net Income (Loss) Per Common Share (Tables)

9 Months Ended

Sep. 30, 2022

Net Income (Loss) Per Common Share

Schedule of basic and diluted net income (loss) per common share

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(in thousands, except share and per share data)				(in thousands, except share and per share data)
Numerator:
Net income (loss) attributable to common stockholders	$	(32,759)	$	(40,191)	$	(43,139)	$	9,570
Denominator:
Weighted-average common shares outstanding used in computing basic net income (loss)		59,716,594		58,350,647		59,564,985		58,199,928
Effect of dilutive securities		—		—		—		2,146,552
Weighted-average common shares outstanding used in computing diluted net income (loss)		59,716,594		58,350,647		59,564,985		60,346,480
Basic net income (loss) per common share	$	(0.55)	$	(0.69)	$	(0.72)	$	0.16
Diluted net income (loss) per common share	$	(0.55)	$	(0.69)	$	(0.72)	$	0.16

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Marketable Debt and Equity Securities (Tables)

9 Months Ended

Sep. 30, 2022

Marketable Debt and Equity Securities

Schedule of marketable securities

			Gross		Gross
	Amortized		Unrealized		Unrealized
September 30, 2022	Cost		Gains		Losses		Fair Value
(in thousands)
Money Market Funds	$	24,506	$	—	$	—	$	24,506
Corporate Securities		188,360		—		(1,763)		186,597
Government Securities		378,623		—		(8,102)		370,521
	$	591,489	$	—	$	(9,865)	$	581,624
Reported as
Cash and cash equivalents							$	24,506
Marketable securities								557,118
Total investments							$	581,624
			Gross		Gross
	Amortized		Unrealized		Unrealized
December 31, 2021	Cost		Gains		Losses		Fair Value
(in thousands)
Money Market Funds	$	123,892	$	—	$	—	$	123,892
Corporate Securities		144,584		—		(166)		144,418
Government Securities		311,148		1		(1,335)		309,814
	$	579,624	$	1	$	(1,501)	$	578,124
Reported as
Cash and cash equivalents							$	123,892
Marketable securities								454,232
Total investments							$	578,124

Schedule of maturities of marketable securities

	Amortized		Estimated
September 30, 2022	Cost		Fair Value
(in thousands)
Mature in one year or less	$	523,629	$	515,398
Mature within two years		43,354		41,720
	$	566,983	$	557,118

Schedule of unrealized losses on available-for-sale investments

	Less than 12 months				12 months or greater
			Unrealized				Unrealized
September 30, 2022	Fair value		losses		Fair value		losses
(in thousands)
Corporate Securities	$	143,625	$	(1,649)	$	2,880	$	(114)
Government Securities		331,407		(6,582)		38,840		(1,520)
	$	475,032	$	(8,231)	$	41,720	$	(1,634)
	Less than 12 months				12 months or greater
			Unrealized				Unrealized
December 31, 2021	Fair value		losses		Fair value		losses
(in thousands)
Corporate Securities	$	50,337	$	(51)	$	45,872	$	(115)
Government Securities		39,909		(54)		254,593		(1,281)
	$	90,246	$	(105)	$	300,465	$	(1,396)

Schedule of equity securities with readily determinable fair value

The Company’s equity securities include securities with a readily determinable fair value. These investments are carried at fair value with changes in fair value recognized each period and reported within other income (expense). For the three and nine months ended September 30, 2022, a gain of $5.3 million and a loss of $4.7 million, respectively, were recorded under other income (expense) related to these securities. Equity securities with a readily determinable fair value, which are categorized as Level 1 in the fair value hierarchy under ASC 820, and their fair values (in thousands) as of September 30, 2022 and December 31, 2021 are as follows:

	Fair Value		Fair Value
	September 30, 2022		December 31, 2021
Astria Common Stock	$	5,785	$	3,449
INmune Common Stock		11,690		19,233
Viridian Common Stock		14,709		14,178
	$	32,184	$	36,860

Schedule of equity securities without readily determinable fair value

	Carrying Value		Carrying Value
	September 30, 2022		December 31, 2021
Astria Preferred Stock	$	174	$	312
Zenas Preferred Stock		30,950		30,950
	$	31,124	$	31,262

Schedule of net gains and losses

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Net gain (loss) recognized on equity securities	$	5,299	$	1,506	$	(4,676)	$	57,507
Less: net gain recognized on sale of equity securities		—		—		—		(18,301)
Unrealized gain (loss) recognized on equity securities	$	5,299	$	1,506	$	(4,676)	$	39,206

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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2022

Stock-Based Compensation

Schedule of total employee, director and non-employee stock-based compensation expense recognized

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
General and administrative	$	4,736	$	3,370	$	12,760	$	9,300
Research and development		8,024		5,573		23,408		17,286
	$	12,760	$	8,943	$	36,168	$	26,586
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Stock options	$	7,833	$	6,959	$	22,178	$	20,844
ESPP		282		265		873		766
RSUs		4,645		1,719		13,117		4,976
	$	12,760	$	8,943	$	36,168	$	26,586

Summary of stock option activity

		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, 2021	8,676,329	$	29.11		6.65	$	100,057
Options granted	2,007,833	$	29.58
Options forfeited	(440,882)	$	33.77
Options exercised	(178,904)	$	18.64
Balance at September 30, 2022	10,064,376	$	29.18		6.51	$	27,085
Exercisable	6,401,896	$	26.57		5.21	$	26,936

Schedule of weighted average assumptions used for estimation of fair value of stock options

	Options				Options
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Expected term (years)	6.1		6.0		6.3		6.2
Expected volatility	51.9	%	55.6	%	53.0	%	55.6	%
Risk-free interest rate	3.38	%	0.88	%	2.02	%	1.00	%
Expected dividend yield	—	%	—	%	—	%	—	%

Schedule of weighted average assumptions used for estimation of fair value of ESPP

	ESPP				ESPP
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Expected term (years)	0.5 - 2.0		0.5 - 2.0		0.5 - 2.0		0.5 - 2.0
Expected volatility	43.2 - 55.7	%	46.1 - 66.4	%	43.2 - 55.7	%	46.1 - 66.4	%
Risk-free interest rate	0.13 - 2.82	%	0.04 - 1.65	%	0.13 - 2.82	%	0.04 - 1.65	%
Expected dividend yield	—	%	—	%	—	%	—	%

Summary of restricted stock unity activity

		Weighted
	Restricted	Average Grant
	Stock	Date Fair Value
	Units	(Per unit)
Unvested RSUs at December 31, 2021	826,148	$	37.79
Granted	809,630		29.61
Vested	(170,295)		37.42
Forfeited	(108,076)		33.65
Unvested RSUs at September 30, 2022	1,357,407	$	33.28

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Leases (Tables)

9 Months Ended

Sep. 30, 2022

Leases

Schedule of operating lease liabilities maturities

The following table reconciles the undiscounted cash flows for the operating leases at September 30, 2022 to the operating lease liabilities recorded on the balance sheet (in thousands):

Years ending December 31,
For the remainder of 2022	$	727
2023		7,251
2024		6,072
2025		6,176
2026		5,638
2027		5,791
Thereafter		49,407
Total undiscounted lease payments		81,062
Less: Tenant allowance		(3,489)
Less: Imputed interest		(34,483)
Present value of lease payments	$	43,090
Lease liabilities - short-term	$	20,551
Lease liabilities - long-term		22,539
Total lease liabilities	$	43,090

Summary of lease costs and cash disclosures

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Operating lease cost	$	1,589	$	1,553	$	4,725	$	2,780
Variable lease cost		156		16		287		44
Total lease costs	$	1,745	$	1,569	$	5,012	$	2,824
Cash paid for amounts included in
the measurement of lease liabilities	$	564	$	1,034	$	1,913	$	2,081

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Collaboration and Licensing Agreements (Tables)

9 Months Ended

Sep. 30, 2022

Collaboration and Licensing Agreements

Schedule of revenue by licensees

The revenues recorded for the three and nine months ended September 30, 2022 and 2021 were earned principally from the following licensees (in millions):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Alexion	$	7.3	$	5.8	$	20.2	$	16.4
Astellas		—		—		5.0		—
Genentech		—		—		—		2.5
Janssen		0.1		6.3		2.1		37.0
MorphoSys		2.1		1.3		5.6		16.4
Novartis		—		—		—		41.1
Vir		17.8		6.3		110.1		7.7
Total	$	27.3	$	19.7	$	143.0	$	121.1

Schedule of disaggregation of revenue

The table below summarizes the disaggregation of revenue recorded for the three and nine months ended September 30, 2022 and 2021 (in millions):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Research collaboration	$	0.1	$	6.3	$	2.1	$	79.7
Milestone		—		—		5.0		14.0
Royalties		27.2		13.4		135.9		27.4
Total	$	27.3	$	19.7	$	143.0	$	121.1

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Summary of Significant Accounting Policies (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Patents, licenses, and other intangible assets
Abandonment costs			$ 1,331,000	$ 727,000
Impairment of intangible assets	$ 0	$ 400,000	0	400,000
Impairment loss or recoveries	0	0	0	0
Net unrealized loss on marketable debt securities	(931,000)	(59,000)	(8,366,000)	(149,000)
Impairment on equity securities	0	600,000	138,000	563,000
In-process intangible assets
Patents, licenses, and other intangible assets
Abandonment costs	$ 300,000	$ 0	$ 1,300,000	$ 300,000

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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Fair Value of Financial Instruments
Money Market Funds	$ 52,654	$ 143,480
Marketable Securities	557,118
Total Fair Value	581,624	578,124
Money Market Funds
Fair Value of Financial Instruments
Money Market Funds	24,506	123,892
Corporate Securities
Fair Value of Financial Instruments
Marketable Securities	186,597	144,418
Government Securities
Fair Value of Financial Instruments
Marketable Securities	370,521	309,814
Level 1
Fair Value of Financial Instruments
Total Fair Value	24,506	123,892
Level 1 | Money Market Funds
Fair Value of Financial Instruments
Money Market Funds	24,506	123,892
Level 2
Fair Value of Financial Instruments
Total Fair Value	557,118	454,232
Level 2 | Corporate Securities
Fair Value of Financial Instruments
Marketable Securities	186,597	144,418
Level 2 | Government Securities
Fair Value of Financial Instruments
Marketable Securities	$ 370,521	$ 309,814

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Net Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net Income (Loss) Per Common Share
Net income (loss) attributable to common stockholders	$ (32,759)	$ (40,191)	$ (43,139)	$ 9,570
Weighted-average common shares outstanding used in computing basic net income (loss)	59,716,594	58,350,647	59,564,985	58,199,928
Effect of dilutive securities				2,146,552
Weighted-average common shares outstanding used in computing diluted net income (loss)	59,716,594	58,350,647	59,564,985	60,346,480
Basic net income (loss) per common share (in dollars per share)	$ (0.55)	$ (0.69)	$ (0.72)	$ 0.16
Diluted net income (loss) per common share (in dollars per share)	$ (0.55)	$ (0.69)	$ (0.72)	$ 0.16

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Net Income (Loss) Per Common Share - Anti-dilutive securities (Details)	9 Months Ended
	Sep. 30, 2021 shares
Net Income (Loss) Per Common Share
Securities excluded in calculation of EPS	1,139,403

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Marketable Debt and Equity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities
Cash and cash equivalents	$ 52,654	$ 143,480
Investments, amortized cost	591,489	579,624
Investments	581,624	578,124
Total amortized cost	566,983
Gross unrealized gains		1
Gross unrealized losses	(9,865)	(1,501)
Marketable Securities	557,118
Marketable securities
Schedule of Available-for-sale Securities
Marketable Securities	557,118	454,232
Money Market Funds
Schedule of Available-for-sale Securities
Cash and cash equivalents	24,506	123,892
Cash and Cash Equivalents
Schedule of Available-for-sale Securities
Cash and cash equivalents	24,506	123,892
Corporate Securities
Schedule of Available-for-sale Securities
Total amortized cost	188,360	144,584
Gross unrealized losses	(1,763)	(166)
Marketable Securities	186,597	144,418
Government Securities
Schedule of Available-for-sale Securities
Total amortized cost	378,623	311,148
Gross unrealized gains		1
Gross unrealized losses	(8,102)	(1,335)
Marketable Securities	$ 370,521	$ 309,814

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Marketable Debt and Equity Securities - Maturities (Details) $ in Thousands	Sep. 30, 2022 USD ($)
Amortized Cost
Maturing in one year or less	$ 523,629
Maturing within two years	43,354
Total amortized cost	566,983
Estimate Fair Value
Maturing in one year or less	515,398
Maturing within two years	41,720
Total estimated fair value	$ 557,118

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Marketable Debt and Equity Securities - Unrealized losses (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Fair value
Fair value, less than 12 months	$ 475,032	$ 90,246
Fair value, 12 months or greater	41,720	300,465
Unrealized losses
Unrealized losses, Less than 12 months	(8,231)	(105)
Unrealized losses, 12 months or greater	(1,634)	(1,396)
Corporate Securities
Fair value
Fair value, less than 12 months	143,625	50,337
Fair value, 12 months or greater	2,880	45,872
Unrealized losses
Unrealized losses, Less than 12 months	(1,649)	(51)
Unrealized losses, 12 months or greater	(114)	(115)
Government Securities
Fair value
Fair value, less than 12 months	331,407	39,909
Fair value, 12 months or greater	38,840	254,593
Unrealized losses
Unrealized losses, Less than 12 months	(6,582)	(54)
Unrealized losses, 12 months or greater	$ (1,520)	$ (1,281)

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Marketable Debt and Equity Securities - Equity Securities with Readily Determinable Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Equity Securities
Equity Securities with Readily Determinable Fair Value	$ 32,184		$ 32,184		$ 36,860
Unrealized gain (loss) recognized on equity securities	5,299	$ 1,506	(4,676)	$ 39,206
Common Stock
Equity Securities
Equity Securities with Readily Determinable Fair Value	32,184		32,184		36,860
Astria/Catabasis | Common Stock
Equity Securities
Equity Securities with Readily Determinable Fair Value	5,785		5,785		3,449
INmune | Common Stock
Equity Securities
Equity Securities with Readily Determinable Fair Value	11,690		11,690		19,233
Viridian | Common Stock
Equity Securities
Equity Securities with Readily Determinable Fair Value	$ 14,709		$ 14,709		$ 14,178

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Marketable Debt and Equity Securities - Equity Securities without Readily Determinable Fair Value (Details) - Preferred Stock - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Equity securities without readily determinable fair value
Equity Securities without Readily Determinable Fair Value	$ 31,124	$ 31,262
Astria/Catabasis
Equity securities without readily determinable fair value
Equity Securities without Readily Determinable Fair Value	174	312
Zenas Bio Pharma Limited
Equity securities without readily determinable fair value
Equity Securities without Readily Determinable Fair Value	$ 30,950	$ 30,950

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Marketable Debt and Equity Securities - Equity Securities Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Equity Securities
Gain (loss) on equity securities, net	$ 5,299	$ 1,506	$ (4,676)	$ 57,507
Impairment on equity securities	0	$ 600	138	$ 563
Preferred Stock
Equity Securities
Equity Securities without Readily Determinable Fair Value	31,124		31,124		$ 31,262
Astria/Catabasis | Preferred Stock
Equity Securities
Equity Securities without Readily Determinable Fair Value	$ 174		174		$ 312
Impairment on equity securities			$ 100
Technology License Agreement | Viridian | Common Stock
Equity Securities
Owned investment	717,144		717,144
License Agreement | INmune | Common Stock
Equity Securities
Owned investment	1,885,533		1,885,533

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Marketable Debt and Equity Securities - Net gains and losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Marketable Debt and Equity Securities
Net gain (loss) recognized on equity securities	$ 5,299	$ 1,506	$ (4,676)	$ 57,507
Less: net gain recognized on sale of equity securities				(18,301)
Unrealized gain (loss) recognized on equity securities	$ 5,299	$ 1,506	$ (4,676)	$ 39,206

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Stock Based Compensation (Details)			1 Months Ended		9 Months Ended		106 Months Ended
	Jan. 01, 2022 shares	Dec. 02, 2013 shares	Dec. 31, 2013	Nov. 30, 2013 shares	Sep. 30, 2022 item shares	Sep. 30, 2021 shares	Sep. 30, 2022 shares
Stock options
Stock-based compensation
Options granted (in shares)					2,007,833	1,662,574
ESPP
Stock-based compensation
Total number of shares of common stock available for issuance					576,409		576,409
Awards issued under the plan (in shares)							598,432
Annual increase in shares of common stock available for issuance (in shares)	593,555
ESPP | Maximum
Stock-based compensation
Annual percentage increase in shares of common stock available for issuance			1.00%
Annual increase in shares of common stock available for issuance (in shares)				621,814
RSUs
Stock-based compensation
Granted					809,630		1,934,117
Annual installment vesting periods | item					3
The 2013 Plan
Stock-based compensation
Total number of shares of common stock available for issuance	2,374,222				14,974,396		14,974,396
Annual percentage increase in shares of common stock available for issuance			4.00%
Increase in shares of common stock available for issuance (in shares)	2,374,222
Options granted (in shares)							14,407,906
The 2010 Plan
Stock-based compensation
Options granted (in shares)		0

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Stock-Based Compensation - Employee expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Stock-based compensation
Total employee, director and non-employee stock-based compensation expense	$ 12,760	$ 8,943	$ 36,168	$ 26,586
Stock options
Stock-based compensation
Total employee, director and non-employee stock-based compensation expense	7,833	6,959	22,178	20,844
ESPP
Stock-based compensation
Total employee, director and non-employee stock-based compensation expense	282	265	873	766
RSUs
Stock-based compensation
Total employee, director and non-employee stock-based compensation expense	4,645	1,719	13,117	4,976
General and administrative
Stock-based compensation
Total employee, director and non-employee stock-based compensation expense	4,736	3,370	12,760	9,300
Research and development
Stock-based compensation
Total employee, director and non-employee stock-based compensation expense	$ 8,024	$ 5,573	$ 23,408	$ 17,286

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Stock-Based Compensation - Option activity (Details) - Stock options - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Number of Shares subject to outstanding options
Balance at the beginning of the period (in shares)	8,676,329
Options granted (in shares)	2,007,833	1,662,574
Options forfeited (in shares)	(440,882)
Options exercised (in shares)	(178,904)
Balance at the end of the period (in shares)	10,064,376		8,676,329
Exercisable options (in shares)	6,401,896
Weighted Average Exercise Price (Per Share)
Balance at the beginning of the period (in dollars per share)	$ 29.11
Options granted (in dollars per share)	29.58
Options forfeited (in dollars per share)	33.77
Options exercised (in dollars per share)	18.64
Balance at the end of the period (in dollars per share)	29.18		$ 29.11
Exercisable (in dollars per share)	$ 26.57
Weighted-average remaining contractual life	6 years 6 months 3 days		6 years 7 months 24 days
Weighted-average remaining contractual life of awards exercisable	5 years 2 months 15 days
Aggregate intrinsic value of options outstanding	$ 27,085		$ 100,057
Aggregate intrinsic value of options exercisable	$ 26,936
Closing price of common stock (in dollars per share)	$ 25.98
Weighted average fair value of options granted (in dollars per share)	$ 15.50	$ 21.96

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Stock-Based Compensation - FV of employee stock options (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Stock options
Weighted average assumptions for estimated fair value of employee stock options
Expected volatility (as a percent)	51.90%	55.60%	53.00%	55.60%
Risk-free interest rate (as a percent)	3.38%	0.88%	2.02%	1.00%
Expected term (years)	6 years 1 month 6 days	6 years	6 years 3 months 18 days	6 years 2 months 12 days
Compensation expense
Period to recognize unamortized compensation expense			2 years 6 months
Unamortized compensation expense related to unvested options	$ 59.1		$ 59.1
ESPP
Weighted average assumptions for estimated fair value of employee stock options
Expected volatility, low end of range (as a percent)	43.20%	46.10%	43.20%	46.10%
Expected volatility, high end of range (as a percent)	55.70%	66.40%	55.70%	66.40%
Risk-free interest rate, low end of range (as a percent)	0.13%	0.04%	0.13%	0.04%
Risk-free interest rate, high end of range (as a percent)	2.82%	1.65%	2.82%	1.65%
Compensation expense
Period to recognize unamortized compensation expense			1 year 2 months 12 days
Unamortized compensation expense related to unvested options	$ 1.4		$ 1.4
ESPP | Minimum
Weighted average assumptions for estimated fair value of employee stock options
Expected term (years)	6 months	6 months	6 months	6 months
ESPP | Maximum
Weighted average assumptions for estimated fair value of employee stock options
Expected term (years)	2 years	2 years	2 years	2 years

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Stock Based Compensation - Restricted stock units (Details) - RSUs $ / shares in Units, $ in Thousands	9 Months Ended	106 Months Ended
	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) $ / shares shares
Stock-based compensation
Beginning balance | shares	826,148
Granted | shares	809,630	1,934,117
Vested | shares	(170,295)
Forfeited | shares	(108,076)
Ending balance | shares	1,357,407	1,357,407
Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares	$ 37.79
Weighted Average Grant Date Fair Value, Granted | $ / shares	29.61
Weighted Average Grant Date Fair Value, Vested | $ / shares	37.42
Weighted Average Grant Date Fair Value, Forfeited | $ / shares	33.65
Weighted Average Grant Date Fair Value, Ending Balance | $ / shares	$ 33.28	$ 33.28
Compensation expense
Unamortized compensation expense related to unvested restricted stock units | $	$ 32,000	$ 32,000
Period to recognize unamortized compensation expense	2 years

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Leases (Details) $ in Thousands	1 Months Ended		3 Months Ended	9 Months Ended
	Jun. 30, 2021 item	Jul. 31, 2017	Sep. 30, 2022 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2026 USD ($)	Aug. 02, 2022 USD ($)	Aug. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)
Lessee, Lease, Description [Line Items]
Option to extend		true
For the remainder of 2022			$ 727	$ 727
2023			7,251	7,251
2024			6,072	6,072
2025			6,176	6,176
2026			5,638	5,638
2027			5,791	5,791
Thereafter			49,407	49,407
Total undiscounted lease payments			81,062	81,062
Less: Tenant allowance			(3,489)	(3,489)
Less: Imputed interest			(34,483)	(34,483)
Present value of lease payments			43,090	43,090
Lease liability - long-term			$ 22,539	$ 22,539				$ 33,969
Monrovia, CA - office and laboratory space
Lessee, Lease, Description [Line Items]
Renewal term			5 years	5 years
Monrovia, CA - office and laboratory space with additional space
Lessee, Lease, Description [Line Items]
Renewal term			2 years	2 years
ROU assets exchanged for operating lease liabilities			$ 300	$ 300
San Diego, CA - office space
Lessee, Lease, Description [Line Items]
ROU assets exchanged for operating lease liabilities				1,500
Pasadena, CA - office and laboratory space
Lessee, Lease, Description [Line Items]
Phases of lease term | item	2
Improvement allowance						$ 5,000	$ 17,000
ROU assets exchanged for operating lease liabilities			$ 11,400	$ 11,400
Forecast | Pasadena, CA - office and laboratory space
Lessee, Lease, Description [Line Items]
Improvement allowance					$ 3,300

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Leases - Operating lease liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Leases
Lease liability - short-term	$ 20,551
Lease liability - long-term	22,539	$ 33,969
Operating lease liabilities	$ 43,090

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Leases - Lease costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Leases
Operating lease cost	$ 1,589	$ 1,553	$ 4,725	$ 2,780
Variable lease cost	156	16	287	44
Total lease costs	1,745	1,569	5,012	2,824
Cash paid for amounts included in the measurement of lease liabilities	$ 564	$ 1,034	$ 1,913	$ 2,081
Remaining lease term	11 years 10 months 24 days	12 years 3 months 18 days	11 years 10 months 24 days	12 years 3 months 18 days
Discount rate	9.10%	5.70%	9.10%	5.70%

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Collaboration and Licensing Agreements (Details)				1 Months Ended					3 Months Ended			9 Months Ended
	Nov. 12, 2021 USD ($) shares	Oct. 01, 2021 USD ($) $ / shares	Mar. 08, 2019	Dec. 31, 2021 USD ($) item	Nov. 30, 2020 USD ($) item	Mar. 31, 2020 item	Feb. 28, 2019	Jan. 31, 2013 Program	Sep. 30, 2022 USD ($) agreement	Sep. 30, 2021 USD ($) agreement	Sep. 30, 2019 item	Sep. 30, 2022 USD ($) agreement	Sep. 30, 2021 USD ($) agreement	Mar. 31, 2022 USD ($)
Collaboration research and licensing agreements
Receivable				$ 66,384,000					$ 44,876,000			$ 44,876,000
Revenue recorded									27,299,000	$ 19,683,000		142,969,000	$ 121,096,000
Other income									(1,000)	(593,000)		(244,000)	(610,000)
Impairment on equity securities									0	600,000		138,000	563,000
Net gains recognized on sale of equity securities													18,301,000
Unrealized gain (loss) recognized on equity securities									5,299,000	1,506,000		(4,676,000)	39,206,000
Net gains recognized on equity securities									5,299,000	1,506,000		(4,676,000)	57,507,000
Accounts receivable				$ 66,384,000					44,876,000			44,876,000
Deferred revenue									35,200,000	13,000,000.0		35,200,000	13,000,000.0
Royalties
Collaboration research and licensing agreements
Revenue recorded									27,200,000	13,400,000		135,900,000	27,400,000
Milestone
Collaboration research and licensing agreements
Revenue recorded												5,000,000.0	14,000,000.0
Research collaboration
Collaboration research and licensing agreements
Revenue recorded									100,000	6,300,000		2,100,000	79,700,000
Alexion Pharmaceuticals, Inc.
Collaboration research and licensing agreements
Revenue recorded									7,300,000	5,800,000		20,200,000	16,400,000
Astellas
Collaboration research and licensing agreements
Revenue recorded												5,000,000.0
Genentech
Collaboration research and licensing agreements
Revenue recorded													2,500,000
Genentech | Collaboration and License Agreement
Collaboration research and licensing agreements
Revenue recognized													2,500,000
MorphoSys
Collaboration research and licensing agreements
Revenue recorded									2,100,000	1,300,000		5,600,000	16,400,000
MorphoSys | Collaboration and License Agreement | Royalties
Collaboration research and licensing agreements
Revenue recognized										1,300,000
Novartis
Collaboration research and licensing agreements
Revenue recorded													41,100,000
Novartis | Collaboration and License Agreement
Collaboration research and licensing agreements
Revenue recognized													41,100,000
Vir
Collaboration research and licensing agreements
Revenue recorded									17,800,000	6,300,000		110,100,000	7,700,000
Option and license agreement | Alexion Pharmaceuticals, Inc.
Collaboration research and licensing agreements
Receivable									12,500,000			12,500,000
Accounts receivable									12,500,000			12,500,000
Deferred revenue									0			0
Number of different target programs | Program								1
Option and license agreement | Alexion Pharmaceuticals, Inc. | Royalties
Collaboration research and licensing agreements
Revenue recognized									7,300,000	5,800,000		20,200,000	16,400,000
Research and License Agreement | Amgen, Inc.
Collaboration research and licensing agreements
Revenue recognized									0	0		0	0
Deferred revenue									0			0
Research and License Agreement | Astellas
Collaboration research and licensing agreements
Revenue recognized									0	0		5,000,000.0	0
Deferred revenue									0			0
Research and License Agreement | Astellas | Milestone
Collaboration research and licensing agreements
Contract asset														$ 5,000,000.0
Collaboration and License Agreement | Genentech
Collaboration research and licensing agreements
Initial cost-sharing percentage			45.00%
Research license term							2 years
Revenue recognized									0	0		0
Collaboration and License Agreement | Genentech | XmAb24306
Collaboration research and licensing agreements
Cost sharing receivable (payable)									(3,200,000)			(3,200,000)
Collaboration and License Agreement | Genentech | Research service
Collaboration research and licensing agreements
Deferred revenue									0			0
Collaboration and License Agreement | Janssen Biotech, Inc
Collaboration research and licensing agreements
Revenue recognized									$ 100,000	$ 6,300,000		$ 2,100,000	$ 37,000,000.0
Number of collaboration and license agreements | agreement									2	2		2	2
Collaboration and License Agreement | MorphoSys
Collaboration research and licensing agreements
Deferred revenue									$ 0			$ 0
Collaboration and License Agreement | MorphoSys | Royalties
Collaboration research and licensing agreements
Receivable									2,000,000.0			2,000,000.0
Revenue recognized									2,100,000			5,600,000	$ 16,400,000
Accounts receivable									2,000,000.0			2,000,000.0
Collaboration and License Agreement | Novartis
Collaboration research and licensing agreements
Revenue recognized									0	$ 0		0
Deferred revenue									0			0
Collaboration and License Agreement | Novartis | Development
Collaboration research and licensing agreements
Cost sharing receivable (payable)									300,000			300,000
Technology License Agreement | Astria/Catabasis
Collaboration research and licensing agreements
Unrealized gain (loss) recognized on equity securities									3,900,000	(2,400,000)		2,300,000	6,700,000
Deferred revenue									0			0
Technology License Agreement | Viridian
Collaboration research and licensing agreements
Number of antibodies | item				3
Revenue recognized									0	0		0	0
Unrealized gain (loss) recognized on equity securities									6,400,000	(600,000)		500,000	0
Deferred revenue									0			0
License Agreement | INmune
Collaboration research and licensing agreements
Net gains recognized on sale of equity securities													18,300,000
Unrealized gain (loss) recognized on equity securities									(5,000,000.0)	4,500,000		(7,500,000)	32,500,000
License Agreement | Zenas Bio Pharma Limited
Collaboration research and licensing agreements
Revenue recognized									0	0		0	0
Purchase amount of share options or equity in noncash transaction					$ 16,100,000
Impairment on equity securities									0	0		0	0
Deferred revenue									0			0
Percentage of equity of private company					15.00%
Number of drug candidates | item					3
Patent License Agreement | Vir
Collaboration research and licensing agreements
Deferred revenue									0			0
Number of different target programs | item						2					2
Patent License Agreement | Vir | Royalties
Collaboration research and licensing agreements
Receivable									17,800,000			17,800,000
Revenue recognized									17,800,000	$ 6,300,000		110,100,000
Accounts receivable									17,800,000			17,800,000
Patent License Agreement | Vir | Milestone
Collaboration research and licensing agreements
Revenue recognized													$ 7,700,000
Second Collaboration And License Agreement | Janssen Biotech, Inc
Collaboration research and licensing agreements
Share development percentage		80.00%
Nonrefundable upfront payment		$ 100,000,000.0
Potential milestone payment		$ 1,187,500,000
Research license term		2 years
Deferred revenue									35,200,000			35,200,000
Cost sharing receivable (payable)									$ 3,700,000			$ 3,700,000
Percentage of responsibility for development costs		20.00%
Second Collaboration And License Agreement | Johnson & Johnson Innovation, JJDC, Inc. | Common Stock
Collaboration research and licensing agreements
Total equity shares | shares	748,062
Proceeds from sale of common stock	$ 28,900,000	$ 25,000,000.0
Term of weighted average price of stock		30 days
Volume-weighted average per share price | $ / shares		$ 33.4197
Second Technology License Agreement | Viridian
Collaboration research and licensing agreements
Research license term				1 year
Development-based | Second Collaboration And License Agreement | Janssen Biotech, Inc
Collaboration research and licensing agreements
Potential milestone payment		$ 289,400,000
Regulatory-based | Second Collaboration And License Agreement | Janssen Biotech, Inc
Collaboration research and licensing agreements
Potential milestone payment		378,100,000
Sales-based | Second Collaboration And License Agreement | Janssen Biotech, Inc
Collaboration research and licensing agreements
Potential milestone payment		$ 520,000,000.0

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Collaborative and Licensing Agreements - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue recorded	$ 27,299	$ 19,683	$ 142,969	$ 121,096
Deferred revenue	35,200	13,000	35,200	13,000
Research collaboration
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue recorded	100	6,300	2,100	79,700
Milestone
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue recorded			5,000	14,000
Royalties
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue recorded	27,200	13,400	135,900	27,400
Alexion Pharmaceuticals, Inc.
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue recorded	7,300	5,800	20,200	16,400
Astellas
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue recorded			5,000
Genentech
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue recorded				2,500
Janssen
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue recorded	100	6,300	2,100	37,000
MorphoSys
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue recorded	2,100	1,300	5,600	16,400
Novartis
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue recorded				41,100
Vir
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue recorded	$ 17,800	$ 6,300	$ 110,100	$ 7,700

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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Reconciliation of federal statutory income tax to effective income tax
Income tax expense	$ 1,088	$ 0	$ 1,088	$ 0

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Subsequent Event (Details) - Zenas Bio Pharma Limited - Subsequent Events $ in Millions	Nov. 30, 2022 USD ($)
Collaboration research and licensing agreements
Increase in equity securities	$ 17.9
Warrant
Collaboration research and licensing agreements
Equity Securities without Readily Determinable Fair Value, Amount	34.5
Convertible Note
Collaboration research and licensing agreements
Equity Securities without Readily Determinable Fair Value, Amount	$ 7.7