Form 10-Q/A - Quarterly report [Sections 13 or 15(d)]: [Amend]

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

_______________________________________________

FORM 10-Q/A

(Amendment No. 1)

(Mark One)


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

For the quarterly period ended June 30, 2024


			o			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.)

465 North Halstead Street, Suite 200, Pasadena, CA			91107
(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 x No o

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 x No o

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 x Accelerated filer o Non-accelerated filer o Smaller reporting company o Emerging growth company o

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. o

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

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 July 30, 2024
Common stock, par value $0.01 per share						61,833,530

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EXPLANATORY NOTE

On February 13, 2025, Xencor, Inc. (the Company) filed a Current Report on Form 8-K disclosing that the Audit Committee (the Audit Committee) of the Board of Directors of the Company, after consultation with the Company’s management and RSM US LLP, the Company’s independent registered public accounting firm (RSM), concluded that the following financial statements should no longer be relied upon because of errors in such financials as addressed in FASB ASC Topic 250, Accounting and Error Corrections, (i) the Company's audited consolidated financial statements for the fiscal year ended December 31, 2023, contained in its Annual Report on Form 10-K for the year ended December 31, 2023, originally filed with the Securities and Exchange Commission (SEC) on February 29, 2024, (ii) the Company's unaudited consolidated financial statements for the three months ended March 31, 2024, contained in its Quarterly Report on Form 10-Q for the quarter ended March 31, 2024, originally filed with the SEC on May 9, 2024, (iii) the Company's unaudited consolidated financial statements for the three and six months ended June 30, 2024, contained in its Quarterly Report on Form 10-Q for the quarter ended June 30, 2024, originally filed with the SEC on August 8, 2024 (the Original Form 10-Q), and (iv) the Company's unaudited consolidated financial statements for the three and nine months ended September 30, 2024, contained in its Quarterly Report on Form 10-Q for the quarter ended September 30, 2024, originally filed with the SEC on November 6, 2024. In addition, the Audit Committee concluded that management’s report on the effectiveness of internal control over financial reporting as of December 31, 2023, and RSM’s report on the consolidated balance sheets as of December 31, 2023, the related consolidated statements of income (loss), comprehensive income (loss), stockholders’ equity and cash flows for the year ended December 31, 2023, and the related notes to the consolidated financial statements, as well as RSM’s report on the effectiveness of internal control over financial reporting as of December 31, 2023, should no longer be relied upon. On February 7, 2025, RSM informed us that disclosure should be made and action should be taken to prevent future reliance on RSM’s audit report filed with the Annual Report on Form 10-K for the year ended December 31, 2023 and completed interim review related to previously issued financial statements included in our Quarterly Reports on Form 10-Q for the quarters ended March 31, 2024, June 30, 2024 and September 30, 2024. For additional information, please refer to our Current Report on Form 8-K filed with the SEC on February 13, 2025.

This Amendment No. 1 to our Original Form 10-Q (the Form 10-Q/A) amends and restates certain items noted below in the Original Form 10-Q. This Form 10-Q/A amends the Original Form 10-Q to restate its unaudited financial statements, financial data and related disclosures for the three and six months ended June 30, 2024 to correct errors related to the accounting treatment of a royalty transaction with OMERS Life Sciences entered into in November 2023, the unrecorded tax benefit related to the Company’s treatment of research and development expenses that should have been capitalized under Section 174 of the Internal Revenue Code of 1986, as amended (the Code), as well as an understatement of the Company's state tax obligations, as more fully described below.

Background of Restatement

In November 2023, the Company entered into an agreement for the sale of future royalties due to it under the Alexion Agreement (as defined in this report) with OMERS Life Sciences (the Ultomiris Royalty Sale Agreement). In connection with the preparation of the Company’s financial statements for the year ended December 31, 2024, the Company determined that the royalty transaction under the Ultomiris Royalty Sale Agreement was incorrectly accounted for as deferred income and should have been accounted for as debt. The impact of this error on the consolidated balance sheet as of June 30, 2024 was that accounts receivable was understated by $13.8 million, deferred income was overstated by $140.6 million, debt was understated by $160.5 million and stockholders’ equity was overstated by $6.1 million; the impact on the consolidated statement of income (loss) for the six months ended June 30, 2024 was that revenue was understated by $10.1 million and interest expense was understated by $17.0 million; and the impact on the consolidated statement of cash flows for the six months ended June 30, 2024 was that the cash used in operating activities was understated by $3.6 million and cash provided by financing activities were understated by the same amount. The Company has decided to correct these errors for the year ended December 31, 2023, concluding that the reclassification of the royalty transaction as debt was material to the audited consolidated statement of cash flows for the year ended December 31, 2023 and the unaudited consolidated statements of cash flows for the six months ended June 30, 2024.

In addition, the Company’s management became aware of a misstatement related to the Company’s treatment of research and development expenses under Section 174 of the Code, whereby the Company understated the amount of its research and experimental expenses that should have been capitalized for tax purposes, as reported in the Original Form 10-Q, and therefore identified an uncertain tax position of $6.2 million owed for the fiscal year ended December 31, 2023. In addition, the Company became aware of a misstatement related to its state tax obligations. The Company evaluated its taxable presence and concluded that it understated its state income tax expense by approximately $2.1 million, net of federal benefit, for the year ended December 31, 2023. These amounts exclude any interest and penalties. The impact on

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the consolidated balance sheet as of June 30, 2024 was that uncertain tax position payable was understated by $8.3 million, prepaid income tax was understated by $0.6 million and stockholders’ equity was overstated by $7.7 million. The Company has decided to correct these errors for the year ended December 31, 2023, concluding that the additional tax liability was material to the audited consolidated balance sheet and consolidated statement of loss for the year ended December 31, 2023 and the unaudited consolidated balance sheet as of June 30, 2024. The Company has begun recording interest and penalties related to the understated capitalized research and experimental expense and on the understated state income tax obligations, and the total is immaterial to each quarter in 2024 as well as in aggregate for 2024.

Internal Control Considerations

In connection with the restatement, management has re-evaluated the effectiveness of the Company’s internal controls over financial reporting as of June 30, 2024. The Audit Committee of the Company’s Board of Directors, with concurrence of management, has concluded that, in light of the errors described above, additional material weaknesses exist in the Company’s internal control over financial reporting as of June 30, 2024. Management plans to (i) implement a more rigorous analysis of non-routine transactions, (ii) on highly technical and complex accounting transactions, we will improve our process to identify and select qualified third-party advisors, (iii) enhance our review of capabilities and work performed by the third-party advisors specifically related to the review of accounting guidance for complex non-routine transactions and ,(iv) enhance our review of capabilities and work performed by third-party advisors related to the review of tax advice and (v) on a quarterly basis, review income tax legislative changes and their impact to our financial statements with our tax expert. For a discussion of management’s consideration of the Company's disclosure controls and procedures, internal control over financial reporting, and the material weaknesses identified, see Part I, Item 4 Controls and Procedures of this Form 10-Q/A.

Items Impacted by this Form 10-Q/A

The following sections in the Original Form 10-Q have been amended and restated in this Form 10-Q/A to reflect the restatement:

1.Part I, Item 1 - Financial Statements

2.Part I, Item 2 - Management’s Discussion and Analysis of Financial Condition and Results of Operations

3.Part I, Item 4 - Controls and Procedures

4.Part II, Item 1A - Risk Factors

5.Part II, Item 6 - Exhibits

Except as described above, no other information included in the Original Form 10-Q is being amended or updated by this Form 10-Q/A, and this Form 10-Q/A does not purport to reflect any information or events subsequent to the Original Form 10-Q. This Form 10-Q/A continues to describe the conditions as of the date of the Original Form 10-Q and, except as expressly contained herein, we have not updated, modified or supplemented the disclosures contained in the Original Form 10-Q. Accordingly, this Form 10-Q/A should be read in conjunction with the Original Form 10-Q and with our filings with the SEC subsequent to the Original Form 10-Q. See Note 2 to the accompanying unaudited financial statements, set forth in Part I of this Form 10-Q/A, for details of the restatement and its impact on the unaudited financial statements as of, and for the three and six months ended, June 30, 2024.

In accordance with applicable SEC rules, this Form 10-Q/A includes updated certifications from our Chief Executive Officer and Chief Financial Officer as Exhibits 31.1, 31.2 and 32.1.

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Xencor, Inc.

Quarterly Report on Form 10-Q/A for the Quarter Ended June 30, 2024

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		Page

	E XPLANATORY NOTE	1
	SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS	4
PART I.	FINANCIAL INFORMATION	6
Item 1.	Financial Statements	6
	Consolidated Balance Sheets as of June 30, 2024 (unaudited) and December 31, 2023 (As Restated)	6
	Consolidated Statements of Loss for the Three and Six Months Ended June 30, 2024 and 2023 (unaudited) (As Restated)	7
	Consolidated Statements of Comprehensive Loss for the Three and Six Months Ended June 30, 2024 and 2023 (unaudited) (As Restated)	8
	Consolidated Statements of Stockholders’ Equity for the Three and Six Months Ended June 30, 2024 and 2023 (unaudited) (As Restated)	9
	Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2024 and 2023 (unaudited) (As Restated)	10
	Notes to Consolidated Financial Statements (unaudited) (As Restated)	12
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	30

Item 4.	Controls and Procedures	41

PART II.	OTHER INFORMATION	43

Item 1A.	Risk Factors	43

Item 6.	Exhibits	44

Signatures		45

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

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SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Form 10-Q/A 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 Form 10-Q/A. 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 inflation on our financial condition, results of operations, cash flows and performance;

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

•the success of our ongoing and planned clinical trials;

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

•our 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 partners' abilities to advance drug candidates into, and successfully complete, clinical trials;

•our ability to attract collaborators with development, regulatory, and commercialization 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;

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•our failure to maintain effective internal controls, which led to the restatement of our financial statements, and the risk that we may experience additional material weaknesses; and

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

The factors, risks and uncertainties referred to above and others are more fully described under the heading “Risk Factors” in our Annual Report on Form 10-K/A for the fiscal year ended December 31, 2023 and this Form 10-Q/A. Forward-looking statements should be regarded solely as our current plans, estimates and beliefs. We cannot guarantee future results, events, levels of activity, performance, or achievements. We do not undertake and specifically decline any obligation to update, republish or revise forward-looking statements to reflect future events or circumstances or to reflect the occurrences of unanticipated events.

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PART I — FINANCIAL INFORMATION

Item 1. Financial Statements

Xencor, Inc.

Consolidated Balance Sheets

(in thousands, except share and per share data)


	June 30, 2024		December 31, 2023
	(As Restated)
	(unaudited)
Assets
Current assets
Cash and cash equivalents	$	30,768	$	53,790
Marketable debt securities	449,372		497,725
Marketable equity securities	28,271		42,210
Accounts receivable	35,923		23,739
Prepaid expenses and other current assets	24,588		18,139
Total current assets	568,922		635,603
Property and equipment, net	63,868		66,124
Patents, licenses, and other intangible assets, net	18,778		18,663
Restricted cash	384		380
Marketable debt securities - long term	104,862		145,512
Marketable equity securities - long term	43,780		64,210

Right of use (ROU) asset	39,527		33,995
Other assets	498		648
Total assets	$	840,619	$	965,135
Liabilities and stockholders’ equity
Current liabilities
Accounts payable	$	15,838	$	13,914
Accrued expenses	19,557		23,564
Income tax payable	—		5,291
Lease liabilities	1,262		3,435


Debt	38,930		27,711
Total current liabilities	75,587		73,915
Uncertain tax position payable	8,336		8,336
Lease liabilities, net of current portion	67,156		59,025

Debt, net of current portion	140,826		161,772
Total liabilities	291,905		303,048
Commitments and contingencies
Stockholders’ equity
Preferred stock, $0.01 par value: 10,000,000 authorized shares; -0- issued and outstanding shares at June 30, 2024 and December 31, 2023	—		—
Common stock, $0.01 par value: 200,000,000 authorized shares at June 30, 2024 and December 31, 2023; 61,766,054 issued and outstanding at June 30, 2024 and 60,998,191 issued and outstanding at December 31, 2023	619		611
Additional paid-in capital	1,162,726		1,131,266
Accumulated other comprehensive (loss) income	(652)		1,291
Accumulated deficit	(612,195)		(471,418)
Total stockholders’ equity attributable to Xencor, Inc.	550,498		661,750
Non-controlling interest	(1,784)		337
Total stockholders’ equity	548,714		662,087
Total liabilities and stockholders’ equity	$	840,619	$	965,135

See accompanying notes.

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Xencor, Inc.

Consolidated Statements of Loss

(unaudited)

(in thousands, except share and per share data)


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
	(As Restated)				(As Restated)
Revenue
Collaborations, milestones, and royalties	$	23,907	$	45,523	$	39,904	$	64,485
Operating expenses
Research and development	61,531		60,060		118,404		125,612
General and administrative	17,746		11,460		31,533		25,613
Total operating expenses	79,277		71,520		149,937		151,225
Loss from operations	(55,370)		(25,997)		(110,033)		(86,740)

Other income (expense)
Interest income	7,681		3,771		16,229		6,670
Interest expense	(9,282)		(7)		(18,958)		(14)
Other expense, net	(4)		(9)		(4)		(23)
Impairment on equity securities	220		—		(20,430)		—
Gain (loss) on equity securities, net	(12,027)		288		(9,702)		(2,610)
Total other income (expense), net	(13,412)		4,043		(32,865)		4,023



Net loss	(68,782)		(21,954)		(142,898)		(82,717)

Net loss attributable to non-controlling interest	(1,445)		—		(2,121)		—
Net loss attributable to Xencor, Inc.	$	(67,337)	$	(21,954)	$	(140,777)	$	(82,717)

Basic and diluted net loss per common share attributable to Xencor, Inc.	$	(1.09)	$	(0.37)	$	(2.29)	$	(1.38)


Basic and diluted weighted average common shares outstanding	61,676,444		59,807,558		61,444,384		59,922,784

See accompanying notes.

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Xencor, Inc.

Consolidated Statements of Comprehensive Loss

(unaudited)

(in thousands, except share and per share data)


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
	(As Restated)				(As Restated)
Net loss	(68,782)		(21,954)		(142,898)		(82,717)
Other comprehensive income (loss)
Net unrealized gain (loss) on marketable debt securities	(498)		1,765		(1,942)		5,093
Comprehensive loss	(69,280)		(20,189)		(144,840)		(77,624)
Comprehensive loss attributable to non-controlling interest	(1,445)		—		(2,121)		—
Comprehensive loss attributable to Xencor, Inc.	$	(67,835)	$	(20,189)	$	(142,719)	$	(77,624)

See accompanying notes.

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Xencor, Inc.

Consolidated Statements of Stockholders’ Equity

(unaudited)

(in thousands, except share data)


	Common Stock			Additional Paid-in Capital		Accumulated Other Comprehensive Income (Loss)		Accumulated Deficit		Non-Controlling Interest		Total Stockholders’ Equity
Stockholders’ Equity	Shares	Amount
Balance, December 31, 2023 As Restated	60,998,191	$	611	$	1,131,266	$	1,291	$	(471,418)	$	337	$	662,087
Issuance of common stock upon exercise of stock awards	152,682	1		1,786		—		—		—		1,787
Issuance of restricted stock units	483,812	5		(5)		—		—		—		—
Comprehensive loss	—	—		—		(1,445)		(73,440)		(676)		(75,561)
Stock-based compensation	—	—		11,421		—		—		—		11,421
Balance, March 31, 2024 As Restated	61,634,685	$	617	$	1,144,468	$	(154)	$	(544,858)	$	(339)	$	599,734

Issuance of common stock upon exercise of stock awards	10,213	—		140		—		—		—		140
Issuance of restricted stock units	67,160	1		(1)		—		—		—		—
Issuance of common stock under the Employee Stock Purchase Plan	53,996	1		929		—		—		—		930
Comprehensive loss as restated	—	—		—		(498)		(67,337)		(1,445)		(69,280)
Stock-based compensation	—	—		17,190		—		—		—		17,190
Balance, June 30, 2024 As Restated (unaudited)	61,766,054	$	619	$	1,162,726	$	(652)	$	(612,195)	$	(1,784)	$	548,714


	Common Stock			Additional Paid-in Capital		Accumulated Other Comprehensive Income (Loss)		Accumulated Deficit		Non-Controlling Interest		Total Stockholders’ Equity
Stockholders’ Equity	Shares	Amount
Balance, December 31, 2022	59,997,713	$	601	$	1,072,132	$	(6,952)	$	(338,285)	$	—	$	727,496
Issuance of common stock upon exercise of stock awards	34,388	—		924		—		—		—		924
Issuance of restricted stock units	349,499	4		(4)		—		—		—		—
Comprehensive income (loss)	—	—		—		3,327		(60,763)		—		(57,436)
Stock-based compensation	—	—		12,599		—		—		—		12,599
Balance, March 31, 2023	60,381,600	$	605	$	1,085,651	$	(3,625)	$	(399,048)	$	—	$	683,583

Issuance of common stock upon exercise of stock awards	145,003	1		676		—		—		—		677
Issuance of restricted stock units	18,148	—		—		—		—		—		—
Issuance of common stock under the Employee Stock Purchase Plan	55,309	1		1,241		—		—		—		1,242
Comprehensive income (loss)	—	—		—		1,765		(21,954)		—		(20,189)
Stock-based compensation	—	—		13,563		—		—		—		13,563
Balance, June 30, 2023 (unaudited)	60,600,060	$	607	$	1,101,131	$	(1,860)	$	(421,002)	$	—	$	678,876

See accompanying notes.

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Xencor, Inc.

Consolidated Statements of Cash Flows

(unaudited)

(in thousands)


	Six Months Ended June 30,
	2024		2023
	(As Restated)
Cash flows from operating activities
Net loss	$	(142,898)	$	(82,717)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	6,059		5,130
Accretion of discount on marketable debt securities	(10,037)		(4,345)
Stock-based compensation	28,611		26,162
Equity received in connection with license agreements	—		(10,000)
Abandonment of capitalized intangible assets	784		594
Gain on sale of marketable debt securities	(3)		—
Change in fair value of equity securities	9,702		2,610
Impairment on equity securities	20,430		—
Non-cash royalty revenue related to sale of future royalties	(30,855)		—
Non-cash interest expense	18,937		—
Loss on disposal of assets	6		1,379
Changes in operating assets and liabilities:
Accounts receivable	(9,993)		8,978
Interest receivable from marketable debt securities	(1,705)		420
Prepaid expenses and other assets	(5,691)		1,127
Accounts payable	1,924		4,009
Accrued expenses	(4,007)		(288)
Income taxes	(5,899)		—
Lease liabilities and ROU assets	426		582
Deferred revenue	—		(22,455)

Net cash used in operating activities	(124,209)		(68,814)
Cash flows from investing activities
Purchase of marketable securities	(259,130)		(276,715)
Sale of equity securities	4,236		—

Purchase of patents, licenses, and other intangible assets	(1,549)		(1,490)
Purchase of property and equipment	(3,158)		(14,636)
Proceeds from maturities of marketable securities	347,966		339,580
Proceeds from sale of marketable securities	9,969		—
Net cash provided by investing activities	98,334		46,739
Cash flows from financing activities
Proceeds from issuance of common stock upon exercise of stock awards	1,927		1,601
Proceeds from issuance of common stock under the Employee Stock Purchase Plan	930		1,242

Net cash provided by financing activities	2,857		2,843
Net decrease in cash, cash equivalents, and restricted cash	(23,018)		(19,232)
Cash, cash equivalents, and restricted cash, beginning of period	54,170		53,942
Cash, cash equivalents, and restricted cash, end of period	$	31,152	$	34,710

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	Six Months Ended June 30,
	2024		2023
Supplemental disclosure of cash flow information
Cash paid during the period for:
Interest	$	21	$	14
Income taxes	$	6,100	$	—
Supplemental disclosures of non-cash activities
Unrealized (loss) gain on marketable securities	$	(1,942)	$	5,093
ROU assets obtained	$	7,166	$	—

Reconciliation of cash, cash equivalents, and restricted cash reported in the balance sheets
Cash and cash equivalents	$	30,768	$	34,710
Restricted cash	384		—
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	$	31,152	$	34,710

See accompanying notes.

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Xencor, Inc.

Notes to Financial Statements

(unaudited)

June 30, 2024

1. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying unaudited consolidated 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 consolidated 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 consolidated 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 consolidated 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 consolidated interim financial statements and related notes should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s 2023 Annual Report on Form 10-K/A filed with the Securities and Exchange Commission (SEC) on February 24, 2025.

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of Xencor, Inc. and Gale Therapeutics Inc. (Gale), a variable interest entity (VIE) in which we are the primary beneficiary. Since we own less than 100% of Gale, the Company records net loss attributable to non-controlling interests in its consolidated statements of loss equal to the percentage of the economic or ownership interests retained in Gale by the non-controlling party.

In determining whether we are the primary beneficiary of a VIE, we apply a qualitative approach that determines whether we have (1) the power to direct the activities of the VIE that most significantly impact the entity's economic performance and (2) the obligation to absorb losses of, or the right to receive benefits from the VIE that could potentially be significant to the VIE. We continuously assess whether we are the primary beneficiary of Gale as changes to existing relationships or future transactions may result in us consolidating or deconsolidating Gale.

Use of Estimates

The preparation of consolidated 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 income (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 consolidated interim financial statements include estimates made for royalty revenue, interest expense under the royalty sale agreements, 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.

Reclassifications

Certain prior year amounts in the consolidated financial statements and the notes thereto have been reclassified to conform to the current period's presentation. These reclassifications did not affect the prior period's total assets, liabilities, stockholders' equity, net loss or cash flows. During the six months ended June 30, 2024, we adopted a change in

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presentation on our consolidated statements of loss to include loss from disposal of fixed assets in operating expenses. The prior period has been revised to reflect this change in the presentation.

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 six months ended June 30, 2024 and 2023.

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 $0.4 million and $0.8 million of in-process intangible assets for the three and six months ended June 30, 2024. We abandoned $0.3 million and $0.6 million of in-process intangible assets during the three and six months ended June 30, 2023.

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 investment policy limits the maturity of any individual security to a maximum of 36 months. The average maturity of securities in the portfolio as of June 30, 2024 is less than 12 months. 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 six months ended June 30, 2024 and 2023. 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 six months ended June 30, 2024, the Company recorded an unrealized loss of $0.5 million and $1.9 million in its portfolio of marketable debt securities. During the three and six months ended June 30, 2023, the Company recorded an unrealized gain of $1.8 million and $5.1 million. The unrealized loss is due to the changing interest rate environment and is not due to changes in the credit quality of the underlying securities. The unrealized gain (loss) is recorded in other comprehensive income (loss) for the three and six months ended June 30, 2024 and 2023.

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 consolidated statements of 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 an impairment charge of $20.4 million recorded for the six months ended June 30, 2024 in connection with equity securities without a readily determinable fair value. There was no impairment charge recorded for the three and six months ended June 30, 2023.

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Liability Related to the Sale of Future Revenues

We treat the sale of future Ultomiris and Monjuvi royalties as debt, amortized under the effective interest rate method over the estimated life of the Ultomiris and Monjuvi Royalty Sale Agreements, respectively. See Note 12. The amortization of the liability related to the sale of future Ultomiris and Monjuvi royalties is based on our current estimate of future royalty payments. Royalty revenue will be recognized as earned and the payments made will be a reduction of the liability when paid.

Non-cash Interest Expense on the Liability Related to the Sale of Future Royalties

The total expected royalty payments less the net proceeds received are recorded as non-cash interest expense over the life of the liability. Interest is imputed on the unamortized portion using the effective interest method and is recorded based on the timing of the payments received over the term of the Ultomiris and Monjuvi Royalty Sale Agreements. The actual interest rate will be affected by the timing of the royalty payments and changes in the forecasted revenue.

Recent Accounting Pronouncements

There have been no material changes in recently issued or adopted accounting standards from those disclosed in the Company's 2023 Annual Report on Form 10-K. The Company has reviewed all recently issued accounting pronouncements and does not believe they will have a material impact on our results of operations, financial condition or cash flows.

There have been no other material changes to the significant accounting policies previously disclosed in the Company’s 2023 Annual Report on Form 10-K.

2. Restatement of Previously Issued Financial Statements

In connection with the preparation of the Company’s financial statements for the year ended December 31, 2024, the Company determined that the Ultomiris Royalty Sale Agreement with OMERS entered into in November 2023 was incorrectly accounted for as deferred income and should have been accounted for as debt and that the Company understated the amount of its research and experimental expenses that should have been capitalized under Section 174 of the Code for the year ended December 31, 2023 as well as misstatement related to its state tax obligations, and therefore identified uncertain tax positions for federal and state income tax purposes.

The impact of the restatement on the consolidated balance sheet as of June 30, 2024 is as follows (in thousands):

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	June 30, 2024
	As Reported		Adjustment		As Restated
	(unaudited)
Assets




Accounts receivable	22,073		13,850		35,923
Prepaid expenses and other current assets	23,986		602		24,588
Total current assets	554,470		14,452		568,922








Total assets	$	826,167	$	14,452	$	840,619
Liabilities and stockholders’ equity
Current liabilities





Deferred income	36,472		(36,472)		—
Debt	6,947		31,983		38,930
Total current liabilities	80,076		(4,489)		75,587
Uncertain tax position payable	—		8,336		8,336

Deferred income, net of current portion	104,081		(104,081)		—
Debt, net of current portion	12,313		128,513		140,826
Total liabilities	263,626		28,279		291,905

Stockholders’ equity




Accumulated deficit	(598,368)		(13,827)		(612,195)


Total stockholders’ equity	562,541		(13,827)		548,714
Total liabilities and stockholders’ equity	$	826,167	$	14,452	$	840,619

The impact of the restatement on the consolidated statements of loss for the three months ended June 30, 2024 is as follows (in thousands):


	Three Months Ended June 30, 2024
	As Reported		Adjustment		As Restated

Revenue
Collaborations, milestones, and royalties	$	16,960	$	6,947	$	23,907




Loss from operations	(62,317)		6,947		(55,370)
Other income (expense)

Interest expense	(844)		(8,438)		(9,282)





Loss before income tax expense	(67,291)		(1,491)		(68,782)
Income tax expense	117		(117)		—
Net loss	(67,408)		(1,374)		(68,782)

Net loss attributable to non-controlling interest	(1,445)		—		(1,445)
Net loss attributable to Xencor, Inc.	$	(65,963)	$	(1,374)	$	(67,337)

Basic and diluted net loss per common share attributable to Xencor, Inc.	$	(1.07)	$	(0.02)	$	(1.09)

The impact of the restatement on the consolidated statement of loss for the six months ended June 30, 2024 is as follows (in thousands):

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	Six Months Ended June 30, 2024
	As Reported		Adjustment		As Restated

Revenue
Collaborations, milestones, and royalties	$	29,765	$	10,139	$	39,904




Loss from operations	(120,172)		10,139		(110,033)
Other income (expense)

Interest expense	(1,921)		(17,037)		(18,958)



Total other income (expense), net	(15,828)		(17,037)		(32,865)

Loss before income tax expense	(136,000)		(6,898)		(142,898)
Income tax expense	117		(117)		—
Net loss	(136,117)		(6,781)		(142,898)

Net loss attributable to non-controlling interest	(2,121)		—		(2,121)
Net loss attributable to Xencor, Inc.	$	(133,996)	$	(6,781)	$	(140,777)

Basic and diluted net loss per common share attributable to Xencor, Inc.	$	(2.18)	$	(0.11)	$	(2.29)

The impact of the restatement on the consolidated statements of comprehensive loss for the three months ended June 30, 2024 is as follows (in thousands):


	Three Months Ended June 30, 2024
	As Reported		Adjustment		As Restated

Net loss	(67,408)		(1,374)		(68,782)
Other comprehensive loss
Net unrealized loss on marketable debt securities	(498)		—		(498)
Comprehensive loss	(67,906)		(1,374)		(69,280)
Comprehensive loss attributable to non-controlling interest	(1,445)		—		(1,445)
Comprehensive loss attributable to Xencor, Inc.	$	(66,461)	$	(1,374)	$	(67,835)

The impact of the restatement on the consolidated statement of comprehensive loss for the six months ended June 30, 2024 is as follows (in thousands):


	Six Months Ended June 30, 2024
	As Reported		Adjustment		As Restated

Net loss	(136,117)		(6,781)		(142,898)
Other comprehensive loss
Net unrealized loss on marketable debt securities	(1,942)		—		(1,942)
Comprehensive loss	(138,059)		(6,781)		(144,840)
Comprehensive loss attributable to non-controlling interest	(2,121)		—		(2,121)
Comprehensive loss attributable to Xencor, Inc.	$	(135,938)	$	(6,781)	$	(142,719)

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The impact of the restatement on the consolidated statements of cash flows for the six months ended June 30, 2024 is as follows (in thousands):


	Six Months Ended June 30, 2024
	As Reported		Adjustment		As Restated
Cash flows from operating activities
Net loss	$	(136,117)	$	(6,781)	$	(142,898)
Adjustments to reconcile net loss to net cash used in operating activities:









Non-cash royalty revenue related to sale of future royalties	—		(30,855)		(30,855)
Non-cash interest expense	1,900		17,037		18,937
Changes in operating assets and liabilities:
Accounts receivable	(10,783)		790		(9,993)




Income taxes	(5,782)		(117)		(5,899)


Deferred income	(16,312)		16,312		—
Net cash used in operating activities	(120,595)		(3,614)		(124,209)









Cash flows from financing activities


Reduction of liability for sale of future royalties	(3,614)		3,614		—
Net cash (used in) provided by financing activities	(757)		3,614		2,857

3. 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.

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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):


	June 30, 2024 (unaudited)						December 31, 2023
	Total Fair Value		Level 1		Level 2		Total Fair Value		Level 1		Level 2
Money Market Funds	$	11,624	$	11,624	$	—	$	25,520	$	25,520	$	—
Corporate Securities	211,657		—		211,657		228,723		—		228,723
Government Securities	342,577		—		342,577		414,514		—		414,514
	$	565,858	$	11,624	$	554,234	$	668,757	$	25,520	$	643,237

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 six months ended June 30, 2024 and 2023, there were no transfers between Level 1 and Level 2.

4. Net Loss Per Common Share

Basic net loss per common share is computed by dividing the net loss attributable to Xencor by the weighted-average number of common shares outstanding during the period without consideration of common stock equivalents. Diluted net loss per common share is computed by dividing the net loss attributable to Xencor 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 loss per common share is computed as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
	(in thousands, except share and per share data)				(in thousands, except share and per share data)
	(As Restated)				(As Restated)
Numerator:
Net loss attributable to Xencor, Inc.	$	(67,337)	$	(21,954)	$	(140,777)	$	(82,717)
Denominator:


Weighted-average common shares outstanding used in computing basic and diluted net loss	61,676,444		59,807,558		61,444,384		59,922,784
Basic and diluted net loss per common share attributable to Xencor, Inc.	$	(1.09)	$	(0.37)	$	(2.29)	$	(1.38)

For the three and six months ended June 30, 2024 and 2023, all outstanding potentially dilutive securities have been excluded from the calculation of diluted net loss per common share as the effect of including such securities would have been anti-dilutive.

5. Comprehensive Loss

Comprehensive loss is comprised of net loss and other comprehensive income (loss). For each of the three and six-month periods ended June 30, 2024 and 2023, the only component of other comprehensive income (loss) is net unrealized gain (loss) on marketable debt securities. There were no material reclassifications out of accumulated other comprehensive loss during each of the three and six-month periods ended June 30, 2024 and 2023.

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6. Marketable Debt and Equity Securities

The Company’s marketable debt securities held as of June 30, 2024 and December 31, 2023 are summarized below:


June 30, 2024	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in thousands)
Money Market Funds	$	11,624	$	—	$	—	$	11,624
Corporate Securities	211,930		6		(279)		211,657
Government Securities	342,945		6		(374)		342,577
	$	566,499	$	12	$	(653)	$	565,858

Reported as
Cash and cash equivalents							$	11,624
Marketable securities							554,234
Total investments							$	565,858


December 31, 2023	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in thousands)
Money Market Funds	$	25,520	$	—	$	—	$	25,520
Corporate Securities	228,382		342		(1)		228,723
Government Securities	413,553		1,037		(76)		414,514
	$	667,455	$	1,379	$	(77)	$	668,757

Reported as
Cash and cash equivalents							$	25,520
Marketable securities							643,237
Total investments							$	668,757

The maturities of the Company’s marketable debt securities as of June 30, 2024 are as follows:


June 30, 2024	Amortized Cost		Estimated Fair Value
(in thousands)
Mature in one year or less	$	449,715	$	449,372
Mature within two years	105,160		104,862
	$	554,875	$	554,234

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The unrealized losses on available-for-sale investments and their related fair values as of June 30, 2024 and December 31, 2023 are as follows:


	Less than 12 months				12 months or greater
June 30, 2024	Fair value		Unrealized losses		Fair value		Unrealized losses
(in thousands)
Corporate Securities	$	119,044	$	(217)	$	11,895	$	(62)
Government Securities	246,154		(132)		79,478		(242)
	$	365,198	$	(349)	$	91,373	$	(304)


	Less than 12 months				12 months or greater
December 31, 2023	Fair value		Unrealized losses		Fair value		Unrealized losses
(in thousands)
Corporate Securities	$	8,073	$	(1)	$	—	$	—
Government Securities	66,546		(76)		—		—
	$	74,619	$	(77)	$	—	$	—

The unrealized losses from the available-for-sale securities are 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), net. For the three and six months ended June 30, 2024, net losses of $12.0 million and $9.7 million were recorded under other income (expense) related to these securities. For the three and six months ended June 30, 2023, a net gain of $0.3 million and a net loss of $2.6 million were recorded under other income (expense). 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 June 30, 2024 and December 31, 2023 are as follows:


	Fair Value		Fair Value
	June 30, 2024		December 31, 2023
Astria Common Stock	$	2,311	$	5,360
INmune Common Stock	16,630		21,231
Viridian Common Stock	9,330		15,619
	$	28,271	$	42,210

The Company sold 443,909 shares of common stock of Astria Therapeutics, Inc. (Astria) and held 253,958 shares of common stock of Astria as of June 30, 2024. In July 2024, the Company sold the remaining shares of the common stock of Astria. The common stock has a readily determinable fair value. For the remaining equity interest in Astria held at June 30, 2024, the Company recorded an unrealized loss of $1.3 million and an unrealized gain of $0.4 million for the three and six months ended June 30, 2024, respectively. The Company recorded unrealized losses of $3.5 million and $3.9 million related to its equity interest in Astria for the three and six months ended June 30, 2023, respectively.

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. For the three and six months ended June 30, 2024, the Company recorded unrealized losses of $5.5 million and $4.6 million, respectively, related to its investment in INmune. For the three and six months ended June 30, 2023, the Company recorded unrealized gains of $4.9 million and $5.2 million, respectively.

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. The Company

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recorded unrealized losses of $3.2 million and $6.3 million for the three and six months ended June 30, 2024, respectively. The Company recorded unrealized losses of $1.2 million and $3.9 million for the three and six months ended June 30, 2023, respectively, related to the shares of Viridian common stock.

Below is a reconciliation of net gain (loss) recorded on equity securities during the three and six months ended June 30, 2024 and 2023:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Net gain (loss) recorded on equity securities	$	(12,027)	$	288	$	(9,702)	$	(2,610)
Less: Net gain (loss) recorded on sale of equity securities	(2,012)		—		827		—
Unrealized gain (loss) recorded on equity securities held at the reporting date	$	(10,015)	$	288	$	(10,529)	$	(2,610)

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 evaluates 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 June 30, 2024 and December 31, 2023 are as follows:


	Carrying Value		Carrying Value
	June 30, 2024		December 31, 2023

Zenas Preferred Stock	$	43,780	$	64,210

The Company currently holds an equity interest in Zenas BioPharma, Inc. (Zenas), a private biotechnology company. The Company’s equity interests include preferred stock in Zenas which were received as upfront payments and a milestone payment for licensing certain clinical and preclinical assets from the Company. The Company elected the measurement alternative to carry the Zenas equity at cost minus impairment, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. During the six months ended June 30, 2024, we recorded $20.4 million of impairment charge as a result of Zenas closing a Series C financing transaction on May 3, 2024.

7. Stock Based Compensation

In June 2023, our Board of Directors (the Board) and stockholders approved the 2023 Equity Incentive Plan (the 2023 Plan), which became effective as of June 14, 2023. The Board and the requisite stockholders previously approved the 2013 Equity Incentive Plan (the 2013 Plan). We suspended the 2013 Plan, and no additional award may be granted under the 2013 Plan. The 2023 Plan reserve consists of 3,000,000 shares and the remaining available shares from the 2013 Plan as of the effective date of the 2023 Plan. In addition, any shares of common stock covered by awards granted under the 2013 Plan that terminate on or after June 14, 2023 by expiration, forfeiture, cancellation, or other means without the issuance of such shares will be added to the 2023 Plan reserve. The 2023 Plan does not include a provision for an automatic increase in shares, also known as an evergreen provision.

As of June 30, 2024, the total number of shares of common stock available for issuance under the 2023 Plan is 18,721,104, which includes shares of common stock that were available for issuance under the prior Plans as of the effective date of the 2023 Plan. As of June 30, 2024, a total of 2,380,651 options have been granted under the 2023 Plan.

In November 2013, the Board and our stockholders approved the ESPP, which became effective as of December 5, 2013. As of June 30, 2024, the total number of shares of common stock available for issuance under the ESPP is 987,344. Unless otherwise determined by the Board, beginning on January 1, 2014, and continuing until January 1, 2023, the total number of shares of common stock available for issuance under the ESPP automatically increased 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

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of the immediately preceding year, or (ii) 621,814 shares of common stock. The automatic increase has expired, and the number of shares of common stock available for issuance under the ESPP was not increased on January 1, 2024. As of June 30, 2024, we have issued a total of 787,474 shares of common stock under the ESPP.

During the six months ended June 30, 2024, the Company awarded 959,071 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 June 30, 2024, a total of 1,045,738 RSUs have been granted under the 2023 Plan.

The Company extended vesting periods and expiration dates of equity awards for employees who retired in April 2024. There is a $3.1 million incremental expense as a result of the extension of the expiration dates, and there is a $1.2 million expense as a result of the extension of the vesting periods.

Total employee, director and non-employee stock-based compensation expense recognized for the three and six months ended June 30, 2024 and 2023 are as follows (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
General and administrative	$	8,469	$	4,471	$	13,168	$	8,747
Research and development	8,721		9,092		15,443		17,415
	$	17,190	$	13,563	$	28,611	$	26,162


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Stock options	$	10,945	$	6,842	$	17,818	$	13,825
ESPP	211		341		417		663
RSUs	6,034		6,380		10,376		11,674
	$	17,190	$	13,563	$	28,611	$	26,162

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


	Number of Shares Subject to Outstanding Options	Weighted Average Exercise Price (Per Share)		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Balance at December 31, 2023	11,142,986	$	29.60	6.03	$	9,977
Options granted	2,167,253	$	22.43
Options forfeited	(485,918)	$	32.84
Options exercised	(162,895)	$	11.83
Balance at June 30, 2024	12,661,426	$	28.48	6.18	$	5,813
Exercisable	8,295,121	$	29.38	4.76	$	5,745

We calculate the intrinsic value as the difference between the exercise price of the options and the closing price of common stock of $18.93 per share as of June 30, 2024.

The weighted-average fair value of options granted during the six-month periods ended June 30, 2024 and 2023 were $22.43 and $30.65 per share, respectively. There were 1,941,412 options granted during the six-month period ended June 30, 2023. We estimated the fair value of each equity award, including stock options and shares issued under our ESPP, using the Black-Scholes option-pricing model based on the date of grant of such stock option or ESPP share

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issuance date, with the following weighted average assumptions for the three and six months ended June 30, 2024 and 2023:


	Options				Options
	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Expected term (years)	6.4		6.5		6.4		6.1
Expected volatility	50.4	%	51.2	%	50.1	%	50.5	%
Risk-free interest rate	4.42	%	3.69	%	4.18	%	4.17	%
Expected dividend yield	—	%	—	%	—	%	—	%


	ESPP				ESPP
	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Expected term (years)	0.5 - 2.0		0.5 - 2.0		0.5 - 2.0		0.5 -2.0
Expected volatility	43.0% - 44.6%		38.2% - 55.7%		43.0% - 44.6%		38.2% - 55.7%
Risk-free interest rate	4.71% - 5.40%		0.13% - 5.39%		4.71% - 5.40%		0.13% - 5.39%
Expected dividend yield	—	%	—	%	—	%	—	%

As of June 30, 2024, the unamortized compensation expense related to unvested stock options was $56.9 million. The remaining unamortized compensation expense will be recognized over the next 2.7 years. As of June 30, 2024, the unamortized compensation expense under our ESPP was $1.3 million. The remaining unamortized expense will be recognized over the next 1.4 years.

The following table summarizes the RSU activity for the six-month period ended June 30, 2024:


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

Unvested RSUs at December 31, 2023	1,490,040	$	30.66
Granted	959,071	22.58
Vested	(550,972)	31.72
Forfeited	(119,483)	29.80
Unvested RSUs at June 30, 2024	1,778,656	$	26.02

As of June 30, 2024, the unamortized compensation expense related to unvested RSUs was $37.0 million. The remaining unamortized expense will be recognized over the next 2.1 years.

8. 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 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 commenced 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 received an additional $5.0 million in tenant improvement allowance in exchange for an

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increase in the rental rate of the phase 1 space. The Company received delivery of the second phase premises on December 1, 2022. The Company placed the new facility into service in February 2023. In January 2024, the Company entered into an amendment, in which the Company will be paid for $0.7 million of tenant improvement allowance from the second phase for HVAC costs in the first phase.

In August 2023, the Company entered into a Sublease Agreement for office space in San Diego, California. The term of the Sublease Agreement begins in September 2023 and ends in December 2027. In connection with the Sublease Agreement, the Company provided a $0.4 million Letter of Credit to the landlord. The Letter of Credit will decline over the term of the lease. The Company also entered into a Cash Collateral Agreement for $0.4 million, which is classified as restricted cash in the Consolidated Balance Sheets.

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 June 30, 2024 to the operating lease liabilities recorded on the balance sheet (in thousands):


Years ending December 31,
For the remainder of 2024	$	2,792
2025	8,022
2026	9,238
2027	9,560
2028	9,076
2029	9,331
Thereafter	57,104
Total undiscounted lease payments	105,123
Less: Tenant allowance	(3,252)
Less: Imputed interest	(33,453)
Present value of lease payments	$	68,418

Lease liabilities - short-term	$	1,262
Lease liabilities - long-term	67,156
Total lease liabilities	$	68,418

The following table summarizes lease costs and cash payments for the three and six months ended June 30, 2024 and 2023 (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023

Operating lease cost	$	1,881	$	2,020	$	3,762	$	4,200
Variable lease cost	310		219		1,140		453
Total lease costs	$	2,191	$	2,239	$	4,902	$	4,653

Cash paid for amounts included in the measurement of lease liabilities	$	807	$	721	$	1,877	$	1,445

As of June 30, 2024, the weighted-average remaining lease term for operating leases is 10.7 years, and the weighted-average discount rate for operating leases is 7.0%. As of June 30, 2023, the weighted-average remaining lease term for operating leases was 11.7 years, and the weighted-average discount rate for operating leases was 8.9%.

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9. 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 pursuant to certain 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 sheets for the periods ended June 30, 2024 and December 31, 2023. 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.

10. Collaboration and Licensing Agreements

The following is a summary description of the material collaboration arrangements in the three and six months ended June 30, 2024 and 2023.

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 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.

On November 3, 2023, the Company entered into the Ultomiris Royalty Sale Agreement with OMERS, in which OMERS acquired the rights to certain royalties associated with the existing license relating to Ultomiris in exchange for cash consideration. For the six months ended June 30, 2024, Company earned and recognized $26.4 million in non-cash royalty revenue under the Ultomiris Royalty Sale Agreement.

The Company recognized $13.8 million and $26.4 million of non-cash royalty revenue during the three and six months ended June 30, 2024, respectively, and $11.2 million and $21.6 million of royalty revenue under this arrangement for the three and six months ended June 30, 2023, respectively. As of June 30, 2024, there is $13.8 million receivable and no deferred revenue related to this agreement. Payment of this receivable will be made directly to OMERS.

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 efbalropendekin alfa (also named XmAb306 and RG6323), the Company’s IL-15/IL15Rα-Fc candidate.

Under the terms of the Genentech Agreement, Genentech received an exclusive worldwide license to XmAb306, and we shared in 45% of development and commercialization costs of Collaboration Products, and we were eligible to share in 45% of net profits and losses from the sale of approved products. However, in the fourth quarter of 2023, we agreed with Genentech to convert our current development cost and profit-sharing arrangement into a royalty and milestone payment-based arrangement. Pursuant to the terms of the amended agreement with Genentech, effective June 1, 2024, Genentech assumed sole responsibility over all clinical, regulatory and commercial activities. We are eligible to receive up to $600.0 million in milestones, including $115.0 million in development milestones, $185.0 million in regulatory milestones and $300.0 million in sales-based milestones and tiered royalties ranging from low double-digit to mid-teens percentages.

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The Company did not recognize revenue related to the Genentech Agreement for the three and six months ended June 30, 2024 or 2023. As of June 30, 2024, there is a $7.6 million payable related to cost-sharing development activities during the first half of 2024 for development studies being conducted under the Genentech Agreement. There is no deferred revenue as of June 30, 2024, as obligations to perform research activities have expired.

Janssen Biotech, Inc., a Johnson & Johnson company

J&J Agreement

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

Under the J&J Agreement, the Company conducted research activities and applied its bispecific Fc technology to antibodies targeting prostate cancer provided by J&J. Upon completion of the research activities J&J 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 J&J. In December 2021, J&J selected a bispecific CD28 candidate for further development. J&J will assume full responsibility for development and commercialization of the CD28 bispecific antibody candidate.

The Company did not recognize revenue for the three and six months ended June 30, 2024 and 2023 under the J&J Agreement. As of June 30, 2024, there is no deferred revenue related to this Agreement.

Second J&J Agreement

On October 1, 2021, the Company entered into a second Collaboration and License Agreement (the Second J&J Agreement) with J&J pursuant to which the Company granted J&J an exclusive worldwide license to develop, manufacture, and commercialize plamotamab, the Company’s CD20 x CD3 development candidate, and pursuant to which Xencor and J&J conducted research and development activities to discover novel CD28 bispecific antibodies. The parties conducted joint research activities for a two-year period to discover XmAb bispecific antibodies against CD28 and undisclosed B cell tumor-targets with J&J 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.

The Company collaborated with J&J on clinical development of plamotamab with J&J and shared development costs with J&J paying 80% and the Company paying 20% of certain development costs. In June 2024, the Company was notified that J&J will terminate its rights to plamotamab.

The Company is generally responsible for conducting research activities under the Second J&J Agreement, and J&J is generally responsible for all development, manufacturing, and commercialization activities for CD28 Licensed Antibodies that are advanced. Revenue from the research activities was recognized over a period of time through the end of the research term that services were rendered as we determined that the input method was the appropriate approach to recognize income for such services.

There is a receivable of $5.2 million as of June 30, 2024, related to cost-sharing activities for development of plamotamab under the Second J&J Agreement. No revenue was recognized for the three and six months ended June 30, 2024, and the Company recognized $22.2 million and $27.5 million of revenue for the three and six months ended June 30, 2023, respectively. There is no deferred revenue as of June 30, 2024 related to the Second J&J Agreement as obligations to perform research activities have expired.

MorphoSys AG/Incyte Corporation

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

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(subsequently renamed MOR208 and tafasitamab) with the right to sublicense under certain conditions. In February 2024, Incyte Corporation acquired exclusive global development and commercialization rights to tafasitamab. If certain developmental, regulatory and sales milestones are achieved, the Company is eligible to receive future milestone payments and royalties.

On November 3, 2023, the Company entered into the Monjuvi Royalty Sale Agreement with OMERS, pursuant to which OMERS acquired the rights to certain royalties earned after July 1, 2023 associated with the existing license relating to Monjuvi.

The Company recognized $1.6 million and $4.4 million of non-cash royalty revenue during the three and six months ended June 30, 2024, respectively. The Company recognized $2.0 million and $3.9 million of royalty revenue during the three and six months ended June 30, 2023, respectively. As of June 30, 2024, there is a receivable of $2.1 million related to estimated royalties due under the arrangement. As of June 30, 2024, there is no deferred revenue related to this agreement.

Shanghai Mabgeek Biotech Co., Ltd.

On December 22, 2023, the Company entered into a Technology License Agreement with Shanghai Mabgeek Biotech Co., Ltd. (Mabgeek), and the Company and Mabgeek entered into Amendment No. 1 on June 21, 2024 (collectively, Mabgeek Agreement). Under the Mabgeek Agreement, the Company received an upfront payment of $1.5 million and up to $11.9 million of milestones. In addition, the Company is eligible to receive royalties on the net sales of approved products in the low single digits.

The Company evaluated the Mabgeek Agreement and determined that the single performance obligation was access to a non-exclusive license to certain patents of the Company which were transferred to Mabgeek in June 2024.

The Company recognized $1.5 million of license revenue related to the agreement for the three and six months ended June 30, 2024. There is no deferred revenue as of June 30, 2024 related to this agreement.

Vega Therapeutics, Inc.

In October 2021, the Company entered into a Technology License Agreement (the Vega Agreement) with Vega Therapeutics, Inc. (Vega), in which the Company provided Vega a non-exclusive license to its Xtend Fc technology. In March 2024, Vega notified the Company that it initiated a Phase 1 study, and the Company recorded milestone revenue of $0.5 million.

The Company recognized $0.5 million of revenue for the six months ended June 30, 2024. No revenue was recognized for the three months ended June 30, 2024 or the three and six months ended June 30, 2023.

Vir Biotechnology, Inc.

In 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 novel antibodies Vir developed as potential treatments for patients with COVID-19, including sotrovimab. 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. Vir and its marketing partner, GSK, began recording sales for sotrovimab beginning in June 2021.

The Company recognized $0.1 million of revenue for the six months ended June 30, 2024, and the Company recognized $0.1 million and $1.5 million of royalty revenue for the three and six months ended June 30, 2023, respectively. As of June 30, 2024, there is no receivable related to estimated royalty due under this agreement, and there is no deferred revenue related to this agreement.

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Zenas BioPharma, Inc.

In November 2020, the Company entered into a License Agreement (the Zenas Agreement) with Zenas, pursuant to which the Company received an equity interest in Zenas in exchange for the exclusive, worldwide rights to develop and commercialize drug candidates from the Company.

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, pursuant to which the Company received additional equity in Zenas in exchange for the exclusive worldwide rights to develop and commercialize the Company’s obexelimab (XmAb5871) drug candidate. Under the license, the Company is eligible to receive development, regulatory and sales milestones in connection with the development of obexelimab and royalties on net sales of approved products. The original equity received for the second license was a warrant to acquire additional shares of Zenas. The warrant was exchanged for additional preferred stock in Zenas in November 2022.

The warrant in Zenas was recorded at its fair value as of the date of the Second Zenas Agreement and was reviewed each reporting period for impairment or other evidence of change in value. The preferred shares received in exchange for the warrant were recorded at their fair value at the date of the exchange and is reviewed each reporting period for impairment or other evidence of change in value.

In 2023, Zenas initiated a Phase 3 clinical study with obexelimab and also dosed a second patient in the study. The Company received a development milestone in the form of additional preferred stock in Zenas with a fair value of $10.0 million.

The Company recognized an impairment charge of $20.4 million in the six months ended June 30, 2024 due to an impairment analysis resulting from the Zenas Series C financing transaction. The Company did not record an impairment charge or change in the value of the Zenas equity in the three and six months ended June 30, 2023. The Company did not recognize any revenue for the three and six months ended June 30, 2024. The Company recognized $10.0 million of milestone revenue for the three and six months ended June 30, 2023, and there is no deferred revenue related to this agreement.

Third-Party Licensee

In May 2024, the Company entered into a Patent License Agreement (Third-Party Licensee Agreement) with a third-party licensee. The Company completed delivery of the performance obligation under the agreement, and the Company will receive a payment of $7.0 million.

The Company recognized $7.0 million of license revenue for the three and six months ended June 30, 2024, and there is a receivable of $7.0 million. There is no deferred revenue related to this agreement.

Gale Therapeutics Inc.

In the fourth quarter of 2023, the Company formed a subsidiary, Gale Therapeutics Inc. (Gale), to develop novel drug candidates with its Fc technologies. In December 2023, the Company entered into a Technology License Agreement (Gale License Agreement) with Gale in which Gale received an exclusive worldwide, royalty-bearing, non-transferable license to preclinical assets in exchange for royalties on future sales and an option for future drug candidates that Gale will develop. Concurrently, the Company entered into a Service Agreement (Gale Services Agreement) to provide research and development services and administrative support for Gale. In exchange for $7.5 million of funding, the Company acquired a majority stake in Gale. Total charges of $4.6 million and $8.0 million under the Gale Services Agreement for the three and six months ended June 30, 2024, respectively, were eliminated in consolidation. In July 2024, the Company entered into a preferred stock purchase agreement to purchase additional shares in Gale for $3.0 million.

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Revenues earned

The revenues recorded for the three and six months ended June 30, 2024 and 2023 were earned principally from the following licensees (in millions):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
	(As Restated)				(As Restated)
Alexion	$	13.8	$	11.2	$	26.4	$	21.6



Janssen	—		22.2		—		27.5
Mabgeek	$	1.5	$	—	$	1.5	$	—
MorphoSys	1.6		2.0		4.4		3.9


Vega	—		—		0.5		—
Vir	—		0.1		0.1		1.5
Viridian	$	—	$	—	$	—	$	—
Zenas	$	—	$	10.0	$	—	$	10.0
Third Party Licensee	$	7.0	$	—	$	7.0	$	—
Total	$	23.9	$	45.5	$	39.9	$	64.5

The table below summarizes the disaggregation of revenue recorded for the three and six months ended June 30, 2024 and 2023 (in millions):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
	(As Restated)				(As Restated)
Research collaboration	$	—	$	22.2	$	—	$	22.5
License	8.5		—		8.5		—
Milestone	—		10.0		0.5		15.0
Royalties	—		13.3		0.1		27.0
Non-cash royalties	15.4		—		30.8		—
Total	$	23.9	$	45.5	$	39.9	$	64.5

Remaining Performance Obligations and Deferred Revenue

The Company does not have any remaining performance obligation as of June 30, 2024. As of June 30, 2023, the Company had deferred revenue of $7.9 million for conducting research activities pursuant to the Second J&J Agreement. All deferred revenue as of June 30, 2023 was classified as current liabilities as the Company’s obligations to perform services are due on demand when requested by J&J under the Second J&J Agreement.

11. Income taxes

There is no provision for income tax for the three and six months ended June 30, 2024 or 2023. As of June 30, 2024, the Company’s deferred income tax assets are primarily comprised of deferred revenue, capitalized research and development expenses, federal and state tax net operating loss (NOL) carryforwards and research and development tax credit carryforwards, and have been fully offset by a valuation allowance.

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12. Sale of Future Royalties

Ultomiris Royalty Sale Agreement

The Company evaluated the arrangement and determined that the proceeds from the sale of future royalties should be classified as debt according to ASC 470 Debt. At June 30, 2024, the estimated effective interest rate remains at 21.1%. The Company will continue to reassess the estimate of total future royalty payments and prospectively adjust the imputed interest rate and related amortization if the estimate is materially different. For the three and six months ended June 30, 2024, the Company recognized $13.8 million and $26.4 million of non-cash royalty revenue, respectively, and $8.4 million and $17.0 million of non-cash interest expense, respectively..

Monjuvi Royalty Sale Agreement

The Company evaluated the arrangement and determined that the proceeds from the sale of future royalties should be classified as debt pursuant to ASC 470 Debt. At June 30, 2024, the Company reassessed the estimate of total future royalty payments and updated the estimated effective interest rate to 17.5%. The Company will continue to reassess the estimate of total future royalty payments and prospectively adjust the imputed interest rate and related amortization if the estimate is materially different. For the three and six months ended June 30, 2024, the Company recognized $1.6 million and $4.4 million of non-cash royalty revenue, respectively, and $0.8 million and $1.9 million of non-cash interest expense, respectively.

The following table shows the activity within debt for the six months ended June 30, 2024 (in thousands):


	June 30, 2024
	(As Restated)
Beginning balance of debt related to sale of future royalties	$	189,483
Royalties owed to OMERS	834
Royalties paid to OMERS	(29,498)
Non-cash interest expense recognized	18,937
Ending balance of debt related to sale of future royalties	$	179,756

Debt - short-term	38,930
Debt - long-term	140,826
Total debt	$	179,756

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 Form 10-Q/A and the financial statements and accompanying notes thereto for the fiscal year ended December 31, 2023 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/A for the year ended December 31, 2023. See also “Special Note Regarding Forward-Looking Statements” included in this Form 10-Q/A.

Company Overview

We are a clinical-stage biopharmaceutical company focused on discovering and developing engineered antibody therapeutics to treat patients with cancer and other serious diseases, who have unmet medical needs. We are advancing a broad portfolio of clinical-stage XmAb® drug candidates from our proprietary Fc technology platforms. We also use our protein engineering capabilities to increase our understanding of protein structure and interactions and to design new Fc 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 parts of antibodies that interact with multiple segments of the immune system and control antibody structure. The Fc domain is constant and interchangeable among antibodies, and our engineered Fc domains can be readily substituted for natural Fc domains.

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Our protein engineering capabilities and Fc technologies enable us and our partners to develop XmAb antibodies and other types of 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 developed an antibody scaffold to rapidly create novel multi-specific antibodies that bind two or more 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. Three marketed XmAb medicines have been developed with our protein engineering technologies.

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/A for the year ended December 31, 2023 for a discussion of our core Fc technology platforms.

Clinical-Stage XmAb Drug Candidates

Our modular XmAb bispecific technology and protein engineering capabilities enable us to rapidly advance multiple drug candidates into clinical development. We are currently enrolling Phase 1 or Phase 2 studies for four wholly-owned candidates to treat patients with many different types of serious diseases.

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 patients with locally advanced or metastatic non-small cell lung cancer. Data from a Phase 1 study that enrolled heavily pretreated patients with multiple solid tumor types indicated that vudalimab was generally well-tolerated with encouraging clinical activity.

We are conducting a Phase 2 study of vudalimab in patients with mCRPC, as a monotherapy or in combination with chemotherapy for patients with aggressive variant prostate cancer, as these patients represent a high unmet medical need. We are also conducting a second Phase 2 study in patients with clinically-defined high-risk mCRPC, in which initial data indicates that vudalimab monotherapy has been generally well tolerated and associated with response to treatment in multiple patients who have visceral or lymph node metastases. In March 2024, we disclosed additional clinical data showing characteristics of patients with clinical response (n=5/12) and per label rates of immune-mediated hepatitis for ipilimumab (anti-CTLA-4; 1 mg/kg) + nivolumab (anti-PD-1; 3 mg/kg) combination treatment, as generally comparable to the rate of all hepatobiliary disorder adverse events including immune-mediated hepatitis for vudalimab among all patients treated at doses greater than or equal to 10 mg/kg.

We are also conducting a Phase 1b/2 study evaluating vudalimab as a first-line treatment in patients with locally advanced or metastatic non-small cell lung cancer.

XmAb819 (ENPP3 x CD3): XmAb819 is a bispecific T-cell engager that targets ENPP3, a tumor-associated antigen in renal cell carcinoma (RCC), and CD3, an activating receptor on T cells. The XmAb 2+1 multivalent format used in XmAb819 enables greater selectivity for ENPP3 expressing tumor cells compared to normal cells, which also express ENPP3 at lower levels. We are currently enrolling a Phase 1 study to evaluate XmAb819 in patients with advanced clear cell RCC.

XmAb808 (B7-H3 x CD28): XmAb808 is a tumor-selective, co-stimulatory XmAb 2+1 bispecific T-cell engager designed to bind to the broadly expressed tumor antigen B7-H3 and selectively to the CD28 T-cell co-receptor only when bound to tumor cells. We are conducting a Phase 1 study to evaluate XmAb808 in combination with pembrolizumab in patients with advanced solid tumors.

XmAb541 (CLDN6 x CD3): XmAb541 is a bispecific T-cell engager that targets Claudin-6 (CLDN6), a tumor-associated antigen in ovarian cancer and other solid tumors, and CD3. The XmAb 2+1 multivalent format used in XmAb541 enables greater selectivity for CLDN6 over similar Claudin family members, such as CLDN9, CLDN3 and CLDN4. We are currently enrolling a Phase 1 study to evaluate XmAb541 in patients with ovarian cancer and other CLDN6 expressing tumor types. The first patient was dosed in April 2024.

XmAb564 (IL2-Fc Cytokine): XmAb564 is a 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.

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In the first half of 2024, we concluded a Phase 1b study that was evaluating the safety and tolerability of multiple ascending doses of XmAb564, administered subcutaneously in patients, and we have paused further development.

XmAb662 (IL12-Fc Cytokine): XmAb662 is a potency-reduced interleukin-12 Fc (IL12-Fc) fusion protein engineered to increase anti-tumor activity and immunogenicity in the tumor microenvironment by promoting high levels of interferon gamma secretion from T cells and NK cells. In the first half of 2024, we concluded a Phase 1 study that was evaluating XmAb662 in patients with advanced solid tumors, and we have paused further development.

Candidates Previously Co-Developed with Partners

Plamotamab (CD20 x CD3): Plamotamab is a bispecific T-cell engager that targets CD20, a target receptor on B cells, and CD3. Results from the expansion portion of a Phase 1 study indicate that intravenous plamotamab monotherapy was well tolerated and demonstrated encouraging clinical activity in heavily pretreated patients with an advanced form of lymphoma at the recommended Phase 2 intravenous dose. In 2023, we completed patient enrollment in subcutaneous dose escalation cohorts of the Phase 1 study. We had been co-developing plamotamab with Johnson & Johnson (J&J), and in June 2024, we regained exclusive worldwide rights to develop and commercialize the candidate. We are reviewing plamotamab's potential for addressing the unmet medical needs of patients.

Efbalropendekin alfa (IL15/IL15Rα-Fc Cytokine): Efbalropendekin alfa (XmAb306/RG6323) is a reduced-potency IL15/IL15Rα-Fc fusion protein that incorporates our Xtend extended half-life technology, and we previously co-developed this program in collaboration with Genentech, a member of the Roche Group. Genentech is conducting a Phase 1 study of efbalropendekin as a single agent and in combination with atezolizumab in patients with advanced solid tumors and is also conducting a Phase 1 study evaluating efbalropendekin in patients with relapsed/refractory multiple myeloma in combination with cevostamab (FcRH5 x CD3 bispecific antibody). In the fourth quarter of 2023, we agreed with Genentech to convert our current development cost and profit-sharing arrangement into a royalty and milestone payment-based arrangement. Pursuant to the terms of the amended agreement with Genentech, effective June 1, 2024, Genentech assumed sole responsibility over all clinical, regulatory and commercial activities. We are eligible for up to $600.0 million in milestones and tiered royalties on approved sales from low double-digit to mid-teen percentages range.

Advancements Expanding XmAb Bispecific Platforms

We conduct further research into the function and application of antibody components 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 antibody-based therapeutics in a variety of formats, such as T cell engaging 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 T cell engaging bispecifics (e.g., CD3, CD28) to address an expanded set of tumor antigens. Five clinical-stage programs utilize our XmAb 2+1 format: XmAb819, XmAb808, XmAb541, xaluritamig and ASP2138.

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. In addition to our first clinical-stage CD28 program, XmAb808, our CD28 platform is the subject of two collaborations with J&J. JNJ-9401 and JNJ-1493 are clinical-stage XmAb bispecific antibodies that J&J is developing in prostate cancer and B-cell malignancies, respectively, and both entered clinical development during the fourth quarter of 2023.

In the first quarter of 2024, we amended the MorphoSys Agreement, which included releasing us from certain exclusivity obligations relating to CD19.

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

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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 marketed by Incyte Corporation under the brand name Monjuvi in the U.S. and under the brand name Minjuvi in Europe and Canada. Incyte has exclusive commercialization rights to tafasitamab outside the U.S. Monjuvi® and Minjuvi® are registered trademarks of Incyte. In February 2024, Incyte acquired exclusive global development and commercialization rights to tafasitamab from MorphoSys AG. We earned $1.6 million in estimated non-cash royalties from MorphoSys for the three months ended June 30, 2024.

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 in global markets for the treatment of patients with paroxysmal nocturnal hemoglobinuria (PNH), for certain patients with atypical hemolytic uremic syndrome (aHUS), for certain patients with generalized myasthenia gravis (gMG) and for certain patients with neuromyelitis optica spectrum disorder (NMOSD). Ultomiris was approved in the U.S. for the treatment of adult patients with anti-aquaporin-4 antibody-positive NMOSD in March 2024. Alexion is also evaluating Ultomiris in a broad development program across additional hematology and neurology indications. We earned a total of $13.8 million in estimated non-cash royalties from Alexion for the three months ended June 30, 2024.

Refer to Part I, Item 1, Note 10, Collaboration and Licensing Agreements of the Notes to Financial Statements included in this Form 10-Q/A for a description of the key terms of our arrangements.

We have over 1,500 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 preclinical 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.

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As of June 30, 2024, we had an accumulated deficit of $612.2 million. Substantially all of the operating losses that we have incurred resulted from expenses incurred in connection with our product candidate development programs, our research activities and general and administrative costs associated with our operations.

Results of Operations

Comparison of the Three Months Ended June 30, 2024 and 2023

The following table summarizes our results of operations for the three months ended June 30, 2024 and 2023 (in millions):


	Three Months Ended June 30,
	2024		2023		Change
	(As Restated)
Revenues:
Research collaboration	$	—	$	22.2	$	(22.2)
License	8.5		—		8.5
Milestone	—		10.0		(10.0)
Royalties	15.4		13.3		2.1
Total revenues	23.9		45.5		(21.6)
Operating expenses:
Research and development	61.5		60.0		1.5
General and administrative	17.7		11.5		6.2
Total operating expenses	79.2		71.5		7.7
Other income (expense), net	(13.4)		4.0		(17.4)
Loss before income tax expense	(68.7)		(22.0)		(46.7)
Income tax expense	—		—		—
Net loss	(68.7)		(22.0)		(46.7)
Net loss attributable to non-controlling interest	(1.4)		—		(1.4)
Net loss attributable to Xencor, Inc.	$	(67.3)	$	(22.0)	$	(45.3)

Revenues

Revenues for the three months ended June 30, 2024 are primarily from licensing revenue from Mabgeek and a third-party licensee as well as non-cash royalty revenue from Alexion and MorphoSys/Incyte. Revenues for the three months ended June 30, 2023 are primarily from research revenue from our second collaboration with Janssen, royalty revenue from Alexion, and milestone revenue from Zenas.

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Research and Development Expenses

The following tables summarize our research and development expenses for the three months ended June 30, 2024 and 2023 (in millions):


	Three Months Ended June 30,
	2024		2023		Change
Product programs:
Bispecific programs:
CD3 programs:
Plamotamab*	$	2.8	$	4.1	$	(1.3)
XmAb819 (ENPP3 x CD3)	6.8		4.8		2.0
XmAb541 (CLDN6 X CD3)	4.5		6.3		(1.8)
Total CD3 programs	14.1		15.2		(1.1)

XmAb808 (B7-H3 x CD28)	5.2		4.3		0.9

Tumor micro environment (TME) activator programs:
Vudalimab	12.2		9.6		2.6
XmAb104	0.7		5.8		(5.1)
Total TME activators programs	12.9		15.4		(2.5)

Subtotal bispecific programs	32.2		34.9		(2.7)

Cytokine programs:
XmAb306/RG6323 programs*	4.9		(0.5)		5.4
XmAb564	2.3		5.9		(3.6)
XmAb662 (IL-12-Fc)	2.0		3.8		(1.8)
Total cytokine programs	9.2		9.2		—

Other, research and early stage programs	19.9		14.7		5.2

Wind down costs of terminated programs (1)	0.2		1.2		(1.0)

Total research and development expenses	$	61.5	$	60.0	$	1.5

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

(1)Research and development expenses include wind down costs of programs that terminated in prior periods including the vibecotamab, tidutamab, and XmAb841 programs.

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	Three Months Ended June 30,
	2024		2023		Change
External research and development expenses	$	29.6	$	25.0	$	4.6
Internal research and development expenses	23.2		25.9		(2.7)
Stock based compensation	8.7		9.1		(0.4)
Total research and development expenses	$	61.5	$	60.0	$	1.5

Research and development expenses increased by $1.5 million for the three months ended June 30, 2024 over the same period in 2023 primarily due to increased spending on other research and early stage programs, partially offset by decreased spending on our XmAb104 program.

General and Administrative Expenses

The following table summarizes our general and administrative expenses for the three months ended June 30, 2024 and 2023 (in millions):


	Three Months Ended June 30,
	2024		2023		Change
General and administrative	$	17.7	$	11.5	$	6.2

General and administrative expenses increased by $6.2 million for the three months ended June 30, 2024 over the same period in 2023 primarily due to increased spending on corporate activities, including stock-based compensation costs related to the extension of vesting periods and expiration dates of equity awards for employees who retired in April 2024.

Other Income (Expense), Net

Other (expense), net was $(13.4) million for the three months ended June 30, 2024, which consists of unrealized and realized losses recognized from the change in fair value and the sale of our equity investments and non-cash interest expense from the Ultomiris and Monjuvi Royalty Sale Agreements, partially offset by interest income earned on investments. Other income, net was $4.0 million for the three months ended June 30, 2023, which consists primarily of interest income earned on investments.

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Comparison of the Six Months Ended June 30, 2024 and 2023

The following table summarizes our results of operations for the six months ended June 30, 2024 and 2023 (in millions):


	Six Months Ended June 30,
	2024		2023		Change
	(As Restated)
Revenues:
Research collaboration	$	—	$	22.5	$	(22.5)
License	8.5		—		8.5
Milestone	0.5		15.0		(14.5)
Royalties	30.9		27.0		3.9
Total revenues	39.9		64.5		(24.6)
Operating expenses:
Research and development	118.4		125.6		(7.2)
General and administrative	31.5		25.6		5.9
Total operating expenses	149.9		151.2		(1.3)
Other income (expense), net	(32.9)		4.0		(36.9)
Loss before income tax expense	(142.9)		(82.7)		(60.2)
Income tax expense	—		—		—
Net loss	$	(142.9)	$	(82.7)	$	(60.2)
Net loss attributable to non-controlling interest	(2.1)		—		(2.1)
Net loss attributable to Xencor, Inc.	$	(140.8)	$	(82.7)	$	(58.1)

Revenues

Revenues for the six months ended June 30, 2024 are primarily licensing revenue from Mabgeek and a third-party licensee as well as non-cash royalty revenue from Alexion and MorphoSys. Revenues for the six months ended June 30, 2023 are primarily from research revenue from our second collaboration with Janssen, royalty revenue from Alexion, and milestone revenue from Janssen and Zenas.

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Research and Development Expenses

The following tables summarize our research and development expenses for the six months ended June 30, 2024 and 2023 (in millions):


	Six Months Ended June 30,
	2024		2023		Change
Product programs:
Bispecific programs:
CD3 programs:
Plamotamab*	$	5.0	$	9.8	$	(4.8)
XmAb819 (ENPP3 x CD3)	13.1		9.3		3.8
XmAb541 (CLDN6 X CD3)	7.0		10.9		(3.9)
Total CD3 programs	25.1		30.0		(4.9)

XmAb808 (B7-H3 x CD28)	10.5		8.1		2.4

Tumor micro environment (TME) activator programs:
Vudalimab	23.7		17.3		6.4
XmAb104	3.2		13.0		(9.8)
Total TME activators programs	26.9		30.3		(3.4)

Subtotal bispecific programs	62.5		68.4		(5.9)

Cytokine programs:
XmAb306/RG6323 programs*	10.4		4.5		5.9
XmAb564	6.8		12.5		(5.7)
XmAb662 (IL-12-Fc)	4.8		7.0		(2.2)
Total cytokine programs	22.0		24.0		(2.0)

Other, research and early stage programs	33.2		28.9		4.3

Wind down costs of terminated programs (1)	0.7		4.3		(3.6)

Total research and development expenses	$	118.4	$	125.6	$	(7.2)

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

(1)Research and development expenses include wind down costs of programs that terminated in prior periods including the vibecotamab, tidutamab, and XmAb841 programs.

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	Six Months Ended June 30,
	2024		2023		Change
External research and development expenses	$	55.3	$	54.0	$	1.3
Internal research and development expenses	47.7		54.2		(6.5)
Stock based compensation	15.4		17.4		(2.0)
Total research and development expenses	$	118.4	$	125.6	$	(7.2)

Research and development expenses decreased by $7.2 million for the six months ended June 30, 2024 over the same period in 2023 primarily due to decreased spending on our XmAb104 program, partially offset by increased spending on other research and early stage programs.

General and Administrative Expenses

The following table summarizes our general and administrative expenses for the six months ended June 30, 2024 and 2023 (in millions):


	Six Months Ended June 30,
	2024		2023		Change
General and administrative	$	31.5	$	25.6	$	5.9

General and administrative expenses increased by $5.9 million for the six months ended June 30, 2024 over the same period in 2023 primarily due to increased corporate activities including stock-based compensation costs related to the extension of vesting periods and expiration dates of equity awards for employees who retired in April 2024.

Other Income (Expense), Net

Other income (expense), net was $(32.9) million and $4.0 million for the six months ended June 30, 2024 and 2023, respectively. Other expense, net for the six months ended June 30, 2024 consists of an impairment charge on Zenas, our equity investment without a readily determinable fair value, unrealized and realized losses recognized from the change in fair value and the sale of our other equity investments with readily determinable fair values, and non-cash interest expense from the Ultomiris and Monjuvi Royalty Sale Agreements, partially offset by interest income earned on investments. Other income, net for the same period in 2023 consists primarily of interest income earned on investments, partially offset by unrealized loss recognized from the change in fair value of our equity investments.

Cash Flows

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


	Six Months Ended June 30,
	2024		2023		Change
	(As Restated)
Net cash provided by (used in):
Operating activities	$	(124,209)	$	(68,814)	$	(55,395)
Investing activities	$	98,334	$	46,739	$	51,595
Financing activities	$	2,857	$	2,843	$	14
Net decrease in cash	$	(23,018)	$	(19,232)	$	(3,786)

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Operating Activities

Cash used in operating activities for the six months ended June 30, 2024 and 2023 was $124.2 million and $68.8 million, respectively. The increase in cash used in operating activities is due to the decrease in royalty revenue received as a result of the sale of future royalties under the Ultomiris and Monjuvi Royalty Sale Agreements in 2023 and higher spending in the six months ended June 30, 2024.

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 for the six months ended June 30, 2024 and 2023 are from the net proceeds from the exercise of stock options and purchase of ESPP.

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 June 30, 2024, we had $585.4 million of cash, cash equivalents, restricted cash, and marketable debt securities compared to $697.4 million as of December 31, 2023. The investments in marketable debt securities are further described above in Note 6, Marketable Debt and Equity Securities, of Notes to Financial Statements included in this Form 10-Q/A. 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, and 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 into 2027. We have based these estimates on assumptions that may prove to be wrong 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 June 30, 2024.

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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 Form 10-Q/A.

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 June 30, 2024. Our disclosure controls and procedures are designed to provide reasonable assurance that the information required to be disclosed by us in the reports that we file or submit under the Exchange Act has been appropriately recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

At the time our Original Form 10-Q for the quarterly period ended June 30, 2024 was filed on August 8, 2024, 2024, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were not effective due to a material weakness in our internal control over financial reporting related to the design and operating deficiencies in the impairment analysis of our equity investment in Zenas specifically related to securities without a readily determinable fair value.

Subsequent to the original evaluation, our Chief Executive Officer and Chief Financial Officer further concluded that our disclosure controls and procedures were not effective as of June 30, 2024 due to the material weakness mentioned above, as well as material weaknesses relating to the design of controls related to the review of the accounting treatment of the proceeds from the sale of future royalties pursuant to the Ultomiris Royalty Sale Agreement as part of our non-routine transactions and the design of controls related to the evaluation of certain tax legislation, which led to the restatement of our audited financial statements for the year ended December 31, 2023 and the unaudited financial statements for the three and six months ended June 30, 2024. For additional information see the Explanatory Note in this Form 10-Q/A.

Notwithstanding these material weaknesses and after completion of additional procedures prior to the filing of this Form 10-Q/A, our management, including our Chief Executive Officer and Chief Financial Officer, has concluded that our financial statements in this Form 10-Q/A represent fairly, in all material respects, our financial position, results of operations and cash flows for the periods presented in accordance with accounting principles generally accepted in the United States of America. The material weaknesses did result in a restatement of consolidated financial statements previously reported by us, which are included within this Form 10-Q/A.

Material Weaknesses Remediation Efforts

We continue to make further progress in implementing changes to our internal control over financial reporting to remediate the material weaknesses described above. Since the material weaknesses were identified, management has been implementing, and continues to implement, measures designed to ensure that control deficiencies contributing to the material weaknesses are remediated, such that these controls are designed, implemented, and operating effectively.

Our plan to address the material weakness related to the design and operating deficiencies in the impairment analysis of our equity investment in Zenas specifically related to securities without a readily determinable fair value includes the following: (1) expand management’s oversight of the impairment analysis of its equity investments in securities without readily determinable fair value, (2) continue to implement improved processes and controls for documenting the impairment valuation process of securities without a readily determinable fair value, (3) engage external resources when required to assist with the assessment of valuation methodologies for securities without a readily determinable fair value and (4) continue to formalize and communicate policies related to the evaluation of early indicators of impairment of securities without a readily determinable fair value.

We have made necessary improvements in the design of our internal controls and implemented additional controls around the impairment analysis. We have engaged an external resource to assist with the valuation of securities without a

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readily determinable fair value and we have formalized our policies related to the evaluation of early indicators of impairment by documenting our impairment analysis and having a formal communications framework regarding the Company's knowledge of any indicators of impairment.

Our plan to address the material weakness related to the design of controls related to the review of the accounting treatment of the proceeds from the sale of future royalties pursuant to the Ultomiris Royalty Sale Agreement, includes the following: (1) implement a more rigorous analysis of non-routine transactions, (2) on highly technical and complex accounting transactions, improve our process to identify and select qualified third-party advisors and (3) enhance our review of capabilities and work performed by the third-party advisors specifically related to the review of accounting guidance for complex non-routine transactions

Our plan to address the material weakness related to the design of controls related to the evaluation of certain tax legislation includes: (1) enhance our review of capabilities and work performed by third-party advisors related to the review of tax advice and (2) on a quarterly basis, review income tax legislative changes and their impact to our financial statements with our tax expert.

Management is committed to maintaining an effective internal control environment and remediating the identified material weaknesses in a timely manner, with appropriate oversight from our Audit Committee. We recognize that the material weaknesses in our internal control over financial reporting will not be considered remediated until the remediated controls operate for a sufficient period of time and can be tested and concluded by management to be designed and operating effectively. We continue to evaluate and work to improve our internal control over financial reporting related to the identified material weaknesses and management may determine to take additional measures to address control deficiencies or determine to modify the remediation plan described above. In addition, we report the progress and status of the above remediation efforts to the Audit Committee on a periodic basis.

Changes in Internal Control

Other than the remediation actions described above, there were no changes in our internal control over financial reporting that occurred during the six months ended June 30, 2024 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II — OTHER INFORMATION

Item 1A. Risk Factors

In addition to the risk listed below, you should carefully consider the factors discussed in Part I, “Item 1A. Risk Factors” in our Annual Report on Form 10-K/A for the year ended December 31, 2023, which could materially affect our business, financial position, or future results of operations. In addition to the risks set forth in our Annual Report on Form 10-K/A for the year ended December 31, 2023, 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.

We have identified material weaknesses in our internal control over financial reporting, and our management has concluded that our disclosure controls and procedures were not effective as of December 31, 2023 or June 30, 2024. If we fail to remediate these material weaknesses, or if we identify additional material weaknesses in the future or otherwise fail to maintain an effective system of internal control over financial reporting in the future, we may not be able to accurately or timely report our financial condition or results of operations, investors may lose confidence in the accuracy and completeness of our financial reports and the trading price of our common stock may decline.

Pursuant to Section 404 of the Sarbanes-Oxley Act, our management is required to report on, and our independent registered public accounting firm is required to audit, the effectiveness of our internal control over financial reporting. The rules governing the standards that must be met for management to determine the adequacy of our internal control over financial reporting are complex and require significant documentation, testing, and possible remediation if a deficiency is identified. Annually, we perform activities that include reviewing, documenting, and testing our internal control over financial reporting. If we fail to maintain the adequacy of our internal control over financial reporting, we will not be able to conclude on an ongoing basis that we have effective internal control over financial reporting in accordance with Section 404 of the Sarbanes-Oxley Act. Any failure to achieve and maintain an effective system of internal control could result in materially misstated consolidated financial statements and a failure to meet our reporting obligations, which would likely cause investors to lose confidence in our reported financial information. This could result in significant expenses to remediate any internal control deficiency and lead to a decline in the price of our common stock.

As discussed further in the Explanatory Note to this Form 10-Q/A, on February 11, 2025, we concluded that certain periods of our historical financial statements should no longer be relied upon and should be restated to reflect the correct accounting for the sale of future royalties pursuant to the Ultomiris Royalty Sale Agreement and to account for additional tax liabilities. In addition, on February 7, 2025, RSM informed us that disclosure should be made or action should be taken to prevent future reliance on RSM’s audit report filed with the Annual Report on Form 10-K for the year ended December 31, 2023, originally filed with the SEC on February 29, 2024 and completed interim review related to previously issued financial statements included in our Quarterly Reports on Form 10-Q for the quarters ended March 31, 2024, June 30, 2024 and September 30, 2024. In connection with this restatement, our management re-evaluated the effectiveness of our disclosure controls and procedures and internal control over financial reporting as of December 31, 2023 and June 30, 2024. Our Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures were not effective as of December 31, 2023 and June 30, 2024, and our management has concluded that our internal control over financial reporting was not effective as of December 31, 2023 and June 30, 2024 due to a material weakness (a material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of our annual or interim financial statements will not be prevented or detected on a timely basis) related to the design and operating effectiveness of controls related to non-routine transactions and the evaluation of certain tax legislation.

We are in the process of implementing remediation plans to address these material weaknesses. While we believe these efforts will improve our internal controls and address the root causes of the material weaknesses, the material weaknesses cannot be considered completely remediated until applicable controls have been designed, implemented, have operated for a sufficient period of time and management has concluded, through testing, that these controls are operating effectively. We cannot be certain that the steps we are taking will be sufficient to remediate the control deficiencies that led to the material weaknesses in our internal control over financial reporting or prevent future material weaknesses or control deficiencies from occurring. In addition, we cannot be certain that we have identified all material weaknesses in our internal control over financial reporting, or that in the future we will not have additional material weaknesses in our internal control over financial reporting. For more information related to the material weaknesses and their remediation, see "Item 4. Controls and Procedures" of this Form 10-Q/A.

Table of Contents

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 Annual Report on Form 10-K, filed with the SEC on February 27, 2023).

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						Consulting Agreement by and between the Company and John J. Kuch, dated April 19, 2024 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q, filed with the SEC on August 5, 2024).

10.2						Executive Employment Agreement Addendum No. 2 dated June 1, 2024 by and between the Company and Nancy Valente (incorporated by reference to Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q, filed with the SEC on August 5, 2024).

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)

Table of Contents

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/ BART JAN CORNELISSEN
		Bart Jan Cornelissen
		Chief Financial Officer
		(Principal Financial Officer)

Dated: February 23, 2025

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/A of Xencor, Inc.;

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 registrant as of, and for, the periods presented in this report;

4.The registrant’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 registrant 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 registrant, 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 registrant’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 registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’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 registrant’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 registrant’s internal control over financial reporting.


			/s/ BASSIL I. DAHIYAT
			Bassil I. Dahiyat, Ph.D.
			President & Chief Executive Officer
			(Principal Executive Officer)
Date: February 23, 2025

Exhibit 31.2

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

I, Bart Jan Cornelissen, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q/A of Xencor, Inc.;

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


			/s/ BART JAN CORNELISSEN
			Bart Jan Cornelissen
			Chief Financial Officer
			(Principal Financial Officer)

Date: February 23, 2025

Exhibit 32.1

CERTIFICATION

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

(Subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code)

In connection with the Quarterly Report on Form 10-Q/A of Xencor, Inc. (the “Company”) for the period ended June 30, 2024, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Bassil I. Dahiyat, President & Chief Executive Officer of Xencor, Inc. (the “Company”), and Bart Jan Cornelissen, Chief Financial Officer of the Company, each hereby certifies that, to the best of their knowledge:

1.The 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 Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: February 23, 2025


/s/ BASSIL I. DAHIYAT						/s/ BART JAN CORNELISSEN
Bassil I. Dahiyat						Bart Jan Cornelissen
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.

Cover - shares	6 Months Ended
Cover - shares	Jun. 30, 2024	Jul. 30, 2024
Cover [Abstract]
Document Type	10-Q/A
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2024
Document Transition Report	false
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	465 North Halstead Street
Entity Address, Address Line Two	Suite 200
Entity Address, City or Town	Pasadena
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	91107
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		61,833,530
Entity Central Index Key	0001326732
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q2
Amendment Flag	true
Amendment Description	On February 13, 2025, Xencor, Inc. (the Company) filed a Current Report on Form 8-K disclosing that the Audit Committee (the Audit Committee) of the Board of Directors of the Company, after consultation with the Company’s management and RSM US LLP, the Company’s independent registered public accounting firm (RSM), concluded that the following financial statements should no longer be relied upon because of errors in such financials as addressed in FASB ASC Topic 250, Accounting and Error Corrections, (i) the Company's audited consolidated financial statements for the fiscal year ended December 31, 2023, contained in its Annual Report on Form 10-K for the year ended December 31, 2023, originally filed with the Securities and Exchange Commission (SEC) on February 29, 2024, (ii) the Company's unaudited consolidated financial statements for the three months ended March 31, 2024, contained in its Quarterly Report on Form 10-Q for the quarter ended March 31, 2024, originally filed with the SEC on May 9, 2024, (iii) the Company's unaudited consolidated financial statements for the three and six months ended June 30, 2024, contained in its Quarterly Report on Form 10-Q for the quarter ended June 30, 2024, originally filed with the SEC on August 8, 2024 (the Original Form 10-Q), and (iv) the Company's unaudited consolidated financial statements for the three and nine months ended September 30, 2024, contained in its Quarterly Report on Form 10-Q for the quarter ended September 30, 2024, originally filed with the SEC on November 6, 2024. In addition, the Audit Committee concluded that management’s report on the effectiveness of internal control over financial reporting as of December 31, 2023, and RSM’s report on the consolidated balance sheets as of December 31, 2023, the related consolidated statements of income (loss), comprehensive income (loss), stockholders’ equity and cash flows for the year ended December 31, 2023, and the related notes to the consolidated financial statements, as well as RSM’s report on the effectiveness of internal control over financial reporting as of December 31, 2023, should no longer be relied upon. On February 7, 2025, RSM informed us that disclosure should be made and action should be taken to prevent future reliance on RSM’s audit report filed with the Annual Report on Form 10-K for the year ended December 31, 2023 and completed interim review related to previously issued financial statements included in our Quarterly Reports on Form 10-Q for the quarters ended March 31, 2024, June 30, 2024 and September 30, 2024. For additional information, please refer to our Current Report on Form 8-K filed with the SEC on February 13, 2025.This Amendment No. 1 to our Original Form 10-Q (the Form 10-Q/A) amends and restates certain items noted below in the Original Form 10-Q. This Form 10-Q/A amends the Original Form 10-Q to restate its unaudited financial statements, financial data and related disclosures for the three and six months ended June 30, 2024 to correct errors related to the accounting treatment of a royalty transaction with OMERS Life Sciences entered into in November 2023, the unrecorded tax benefit related to the Company’s treatment of research and development expenses that should have been capitalized under Section 174 of the Internal Revenue Code of 1986, as amended (the Code), as well as an understatement of the Company's state tax obligations, as more fully described below.Background of RestatementIn November 2023, the Company entered into an agreement for the sale of future royalties due to it under the Alexion Agreement (as defined in this report) with OMERS Life Sciences (the Ultomiris Royalty Sale Agreement). In connection with the preparation of the Company’s financial statements for the year ended December 31, 2024, the Company determined that the royalty transaction under the Ultomiris Royalty Sale Agreement was incorrectly accounted for as deferred income and should have been accounted for as debt. The impact of this error on the consolidated balance sheet as of June 30, 2024 was that accounts receivable was understated by $13.8 million, deferred income was overstated by $140.6 million, debt was understated by $160.5 million and stockholders’ equity was overstated by $6.1 million; the impact on the consolidated statement of income (loss) for the six months ended June 30, 2024 was that revenue was understated by $10.1 million and interest expense was understated by $17.0 million; and the impact on the consolidated statement of cash flows for the six months ended June 30, 2024 was that the cash used in operating activities was understated by $3.6 million and cash provided by financing activities were understated by the same amount. The Company has decided to correct these errors for the year ended December 31, 2023, concluding that the reclassification of the royalty transaction as debt was material to the audited consolidated statement of cash flows for the year ended December 31, 2023 and the unaudited consolidated statements of cash flows for the six months ended June 30, 2024.In addition, the Company’s management became aware of a misstatement related to the Company’s treatment of research and development expenses under Section 174 of the Code, whereby the Company understated the amount of its research and experimental expenses that should have been capitalized for tax purposes, as reported in the Original Form 10-Q, and therefore identified an uncertain tax position of $6.2 million owed for the fiscal year ended December 31, 2023. In addition, the Company became aware of a misstatement related to its state tax obligations. The Company evaluated its taxable presence and concluded that it understated its state income tax expense by approximately $2.1 million, net of federal benefit, for the year ended December 31, 2023. These amounts exclude any interest and penalties. The impact on the consolidated balance sheet as of June 30, 2024 was that uncertain tax position payable was understated by $8.3 million, prepaid income tax was understated by $0.6 million and stockholders’ equity was overstated by $7.7 million. The Company has decided to correct these errors for the year ended December 31, 2023, concluding that the additional tax liability was material to the audited consolidated balance sheet and consolidated statement of loss for the year ended December 31, 2023 and the unaudited consolidated balance sheet as of June 30, 2024. The Company has begun recording interest and penalties related to the understated capitalized research and experimental expense and on the understated state income tax obligations, and the total is immaterial to each quarter in 2024 as well as in aggregate for 2024.Internal Control ConsiderationsIn connection with the restatement, management has re-evaluated the effectiveness of the Company’s internal controls over financial reporting as of June 30, 2024. The Audit Committee of the Company’s Board of Directors, with concurrence of management, has concluded that, in light of the errors described above, additional material weaknesses exist in the Company’s internal control over financial reporting as of June 30, 2024. Management plans to (i) implement a more rigorous analysis of non-routine transactions, (ii) on highly technical and complex accounting transactions, we will improve our process to identify and select qualified third-party advisors, (iii) enhance our review of capabilities and work performed by the third-party advisors specifically related to the review of accounting guidance for complex non-routine transactions and ,(iv) enhance our review of capabilities and work performed by third-party advisors related to the review of tax advice and (v) on a quarterly basis, review income tax legislative changes and their impact to our financial statements with our tax expert. For a discussion of management’s consideration of the Company's disclosure controls and procedures, internal control over financial reporting, and the material weaknesses identified, see Part I, Item 4 Controls and Procedures of this Form 10-Q/A.Items Impacted by this Form 10-Q/AThe following sections in the Original Form 10-Q have been amended and restated in this Form 10-Q/A to reflect the restatement:1.Part I, Item 1 - Financial Statements 2.Part I, Item 2 - Management’s Discussion and Analysis of Financial Condition and Results of Operations3.Part I, Item 4 - Controls and Procedures 4.Part II, Item 1A - Risk Factors5.Part II, Item 6 - ExhibitsExcept as described above, no other information included in the Original Form 10-Q is being amended or updated by this Form 10-Q/A, and this Form 10-Q/A does not purport to reflect any information or events subsequent to the Original Form 10-Q. This Form 10-Q/A continues to describe the conditions as of the date of the Original Form 10-Q and, except as expressly contained herein, we have not updated, modified or supplemented the disclosures contained in the Original Form 10-Q. Accordingly, this Form 10-Q/A should be read in conjunction with the Original Form 10-Q and with our filings with the SEC subsequent to the Original Form 10-Q. See Note 2 to the accompanying unaudited financial statements, set forth in Part I of this Form 10-Q/A, for details of the restatement and its impact on the unaudited financial statements as of, and for the three and six months ended, June 30, 2024.In accordance with applicable SEC rules, this Form 10-Q/A includes updated certifications from our Chief Executive Officer and Chief Financial Officer as Exhibits 31.1, 31.2 and 32.1.

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 30,768	$ 53,790
Marketable debt securities	449,372	497,725
Marketable equity securities	28,271	42,210
Accounts receivable	35,923	23,739
Prepaid expenses and other current assets	24,588	18,139
Total current assets	568,922	635,603
Property and equipment, net	63,868	66,124
Patents, licenses, and other intangible assets, net	18,778	18,663
Restricted cash	384	380
Marketable debt securities - long term	104,862	145,512
Marketable equity securities - long term	43,780	64,210
Right of use (ROU) asset	39,527	33,995
Other assets	498	648
Total assets	840,619	965,135
Current liabilities
Accounts payable	15,838	13,914
Accrued expenses	19,557	23,564
Income tax payable	0	5,291
Lease liabilities	1,262	3,435
Debt	38,930	27,711
Total current liabilities	75,587	73,915
Uncertain tax position payable	8,336	8,336
Lease liabilities, net of current portion	67,156	59,025
Debt, net of current portion	140,826	161,772
Total liabilities	291,905	303,048
Commitments and contingencies
Stockholders’ equity
Preferred stock, $0.01 par value: 10,000,000 authorized shares; -0- issued and outstanding shares at June 30, 2024 and December 31, 2023	0	0
Common stock, $0.01 par value: 200,000,000 authorized shares at June 30, 2024 and December 31, 2023; 61,766,054 issued and outstanding at June 30, 2024 and 60,998,191 issued and outstanding at December 31, 2023	619	611
Additional paid-in capital	1,162,726	1,131,266
Accumulated other comprehensive (loss) income	(652)	1,291
Accumulated deficit	(612,195)	(471,418)
Total stockholders’ equity attributable to Xencor, Inc.	550,498	661,750
Non-controlling interest	(1,784)	337
Total stockholders’ equity	548,714	662,087
Total liabilities and stockholders’ equity	$ 840,619	$ 965,135

Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	61,766,054	60,998,191
Common stock, shares outstanding (in shares)	61,766,054	60,998,191

Consolidated Statements of Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue
Collaborations, milestones, and royalties	$ 23,907	$ 45,523	$ 39,904	$ 64,485
Operating expenses
Research and development	61,531	60,060	118,404	125,612
General and administrative	17,746	11,460	31,533	25,613
Total operating expenses	79,277	71,520	149,937	151,225
Loss from operations	(55,370)	(25,997)	(110,033)	(86,740)
Other income (expense)
Interest income	7,681	3,771	16,229	6,670
Interest expense	(9,282)	(7)	(18,958)	(14)
Other expense, net	(4)	(9)	(4)	(23)
Impairment on equity securities	220	0	(20,430)	0
Gain (loss) on equity securities, net	(12,027)	288	(9,702)	(2,610)
Total other income (expense), net	(13,412)	4,043	(32,865)	4,023
Net loss	(68,782)	(21,954)	(142,898)	(82,717)
Net loss attributable to non-controlling interest	(1,445)	0	(2,121)	0
Net loss attributable to Xencor, Inc.	$ (67,337)	$ (21,954)	$ (140,777)	$ (82,717)
Basic net loss per common share attributable to Xencor, Inc. (in dollars per share)	$ (1.09)	$ (0.37)	$ (2.29)	$ (1.38)
Diluted net loss per common share attributable to Xencor, Inc. (in dollars per share)	$ (1.09)	$ (0.37)	$ (2.29)	$ (1.38)
Weighted average shares used to compute net income (loss) per share attributable to common stockholders:
Basic weighted average common shares outstanding (in shares)	61,676,444	59,807,558	61,444,384	59,922,784
Diluted weighted average common shares outstanding (in shares)	61,676,444	59,807,558	61,444,384	59,922,784

Consolidated Statements of Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net loss	$ (68,782)		$ (21,954)		$ (142,898)	$ (82,717)
Net unrealized gain (loss) on marketable debt securities	(498)		1,765		(1,942)	5,093
Comprehensive loss	(69,280)	$ (75,561)	(20,189)	$ (57,436)	(144,840)	(77,624)
Comprehensive loss attributable to non-controlling interest	(1,445)		0		(2,121)	0
Comprehensive loss attributable to Xencor, Inc.	$ (67,835)		$ (20,189)		$ (142,719)	$ (77,624)

Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Non-Controlling Interest
Beginning balance (in shares) at Dec. 31, 2022		59,997,713
Beginning balance at Dec. 31, 2022	$ 727,496	$ 601	$ 1,072,132	$ (6,952)	$ (338,285)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock awards (in shares)		34,388
Issuance of common stock upon exercise of stock awards	924		924
Issuance of restricted stock units (in shares)		349,499
Issuance of restricted stock units	0	$ 4	(4)
Comprehensive income (loss)	(57,436)			3,327	(60,763)
Stock-based compensation	12,599		12,599
Ending balance (in shares) at Mar. 31, 2023		60,381,600
Ending balance at Mar. 31, 2023	683,583	$ 605	1,085,651	(3,625)	(399,048)	0
Beginning balance (in shares) at Dec. 31, 2022		59,997,713
Beginning balance at Dec. 31, 2022	727,496	$ 601	1,072,132	(6,952)	(338,285)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(77,624)
Ending balance (in shares) at Jun. 30, 2023		60,600,060
Ending balance at Jun. 30, 2023	678,876	$ 607	1,101,131	(1,860)	(421,002)	0
Beginning balance (in shares) at Mar. 31, 2023		60,381,600
Beginning balance at Mar. 31, 2023	683,583	$ 605	1,085,651	(3,625)	(399,048)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock awards (in shares)		145,003
Issuance of common stock upon exercise of stock awards	677	$ 1	676
Issuance of restricted stock units (in shares)		18,148
Issuance of restricted stock units	0
Issuance of common stock under the Employee Stock Purchase Plan (in shares)		55,309
Issuance of common stock under the Employee Stock Purchase Plan	1,242	$ 1	1,241
Comprehensive income (loss)	(20,189)			1,765	(21,954)
Stock-based compensation	13,563		13,563
Ending balance (in shares) at Jun. 30, 2023		60,600,060
Ending balance at Jun. 30, 2023	678,876	$ 607	1,101,131	(1,860)	(421,002)	0
Beginning balance (in shares) at Dec. 31, 2023		60,998,191
Beginning balance at Dec. 31, 2023	662,087	$ 611	1,131,266	1,291	(471,418)	337
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock awards (in shares)		152,682
Issuance of common stock upon exercise of stock awards	1,787	$ 1	1,786
Issuance of restricted stock units (in shares)		483,812
Issuance of restricted stock units	0	$ 5	(5)
Comprehensive income (loss)	(75,561)			(1,445)	(73,440)	(676)
Stock-based compensation	11,421		11,421
Ending balance (in shares) at Mar. 31, 2024		61,634,685
Ending balance at Mar. 31, 2024	599,734	$ 617	1,144,468	(154)	(544,858)	(339)
Beginning balance (in shares) at Dec. 31, 2023		60,998,191
Beginning balance at Dec. 31, 2023	662,087	$ 611	1,131,266	1,291	(471,418)	337
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(144,840)
Ending balance (in shares) at Jun. 30, 2024		61,766,054
Ending balance at Jun. 30, 2024	548,714	$ 619	1,162,726	(652)	(612,195)	(1,784)
Beginning balance (in shares) at Mar. 31, 2024		61,634,685
Beginning balance at Mar. 31, 2024	599,734	$ 617	1,144,468	(154)	(544,858)	(339)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock awards (in shares)		10,213
Issuance of common stock upon exercise of stock awards	140		140
Issuance of restricted stock units (in shares)		67,160
Issuance of restricted stock units	0	$ 1	(1)
Issuance of common stock under the Employee Stock Purchase Plan (in shares)		53,996
Issuance of common stock under the Employee Stock Purchase Plan	930	$ 1	929
Comprehensive income (loss)	(69,280)			(498)	(67,337)	(1,445)
Stock-based compensation	17,190		17,190
Ending balance (in shares) at Jun. 30, 2024		61,766,054
Ending balance at Jun. 30, 2024	$ 548,714	$ 619	$ 1,162,726	$ (652)	$ (612,195)	$ (1,784)

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities
Net loss	$ (142,898)	$ (82,717)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	6,059	5,130
Accretion of discount on marketable debt securities	(10,037)	(4,345)
Stock-based compensation	28,611	26,162
Equity received in connection with license agreements	0	(10,000)
Abandonment of capitalized intangible assets	784	594
Gain on sale of marketable debt securities	(3)	0
Change in fair value of equity securities	9,702	2,610
Impairment on equity securities	20,430	0
Non-cash royalty revenue related to sale of future royalties	(30,855)	0
Non-cash interest expense	18,937	0
Loss on disposal of assets	6	1,379
Changes in operating assets and liabilities:
Accounts receivable	(9,993)	8,978
Interest receivable from marketable debt securities	(1,705)	420
Prepaid expenses and other assets	(5,691)	1,127
Accounts payable	1,924	4,009
Accrued expenses	(4,007)	(288)
Income taxes	(5,899)	0
Lease liabilities and ROU assets	426	582
Deferred revenue	0	(22,455)
Net cash used in operating activities	(124,209)	(68,814)
Cash flows from investing activities
Purchase of marketable securities	(259,130)	(276,715)
Sale of equity securities	4,236	0
Purchase of patents, licenses, and other intangible assets	(1,549)	(1,490)
Purchase of property and equipment	(3,158)	(14,636)
Proceeds from maturities of marketable securities	347,966	339,580
Proceeds from sale of marketable securities	9,969	0
Net cash provided by investing activities	98,334	46,739
Cash flows from financing activities
Proceeds from issuance of common stock upon exercise of stock awards	1,927	1,601
Proceeds from issuance of common stock under the Employee Stock Purchase Plan	930	1,242
Reduction of liability for sale of future royalties	0
Net cash provided by financing activities	2,857	2,843
Net decrease in cash, cash equivalents, and restricted cash	(23,018)	(19,232)
Cash, cash equivalents, and restricted cash, beginning of period	54,170	53,942
Cash, cash equivalents, and restricted cash, end of period	31,152	34,710
Cash paid during the period for:
Interest	21	14
Income taxes	6,100	0
Supplemental disclosures of non-cash activities
Unrealized (loss) gain on marketable securities	(1,942)	5,093
ROU assets obtained	7,166	0
Cash and cash equivalents	30,768	34,710
Restricted cash	$ 384	$ 0

Summary of Significant Accounting Policies	6 Months Ended
Summary of Significant Accounting Policies	Jun. 30, 2024
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited consolidated 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 consolidated 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 consolidated 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 consolidated 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 consolidated interim financial statements and related notes should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s 2023 Annual Report on Form 10-K/A filed with the Securities and Exchange Commission (SEC) on February 24, 2025. Principles of Consolidation The accompanying consolidated financial statements include the accounts of Xencor, Inc. and Gale Therapeutics Inc. (Gale), a variable interest entity (VIE) in which we are the primary beneficiary. Since we own less than 100% of Gale, the Company records net loss attributable to non-controlling interests in its consolidated statements of loss equal to the percentage of the economic or ownership interests retained in Gale by the non-controlling party. In determining whether we are the primary beneficiary of a VIE, we apply a qualitative approach that determines whether we have (1) the power to direct the activities of the VIE that most significantly impact the entity's economic performance and (2) the obligation to absorb losses of, or the right to receive benefits from the VIE that could potentially be significant to the VIE. We continuously assess whether we are the primary beneficiary of Gale as changes to existing relationships or future transactions may result in us consolidating or deconsolidating Gale. Use of Estimates The preparation of consolidated 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 income (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 consolidated interim financial statements include estimates made for royalty revenue, interest expense under the royalty sale agreements, 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. Reclassifications Certain prior year amounts in the consolidated financial statements and the notes thereto have been reclassified to conform to the current period's presentation. These reclassifications did not affect the prior period's total assets, liabilities, stockholders' equity, net loss or cash flows. During the six months ended June 30, 2024, we adopted a change in presentation on our consolidated statements of loss to include loss from disposal of fixed assets in operating expenses. The prior period has been revised to reflect this change in the presentation. 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 six months ended June 30, 2024 and 2023. 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 $0.4 million and $0.8 million of in-process intangible assets for the three and six months ended June 30, 2024. We abandoned $0.3 million and $0.6 million of in-process intangible assets during the three and six months ended June 30, 2023. 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 investment policy limits the maturity of any individual security to a maximum of 36 months. The average maturity of securities in the portfolio as of June 30, 2024 is less than 12 months. 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 six months ended June 30, 2024 and 2023. 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 six months ended June 30, 2024, the Company recorded an unrealized loss of $0.5 million and $1.9 million in its portfolio of marketable debt securities. During the three and six months ended June 30, 2023, the Company recorded an unrealized gain of $1.8 million and $5.1 million. The unrealized loss is due to the changing interest rate environment and is not due to changes in the credit quality of the underlying securities. The unrealized gain (loss) is recorded in other comprehensive income (loss) for the three and six months ended June 30, 2024 and 2023. 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 consolidated statements of 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 an impairment charge of $20.4 million recorded for the six months ended June 30, 2024 in connection with equity securities without a readily determinable fair value. There was no impairment charge recorded for the three and six months ended June 30, 2023. Liability Related to the Sale of Future Revenues We treat the sale of future Ultomiris and Monjuvi royalties as debt, amortized under the effective interest rate method over the estimated life of the Ultomiris and Monjuvi Royalty Sale Agreements, respectively. See Note 12. The amortization of the liability related to the sale of future Ultomiris and Monjuvi royalties is based on our current estimate of future royalty payments. Royalty revenue will be recognized as earned and the payments made will be a reduction of the liability when paid. Non-cash Interest Expense on the Liability Related to the Sale of Future Royalties The total expected royalty payments less the net proceeds received are recorded as non-cash interest expense over the life of the liability. Interest is imputed on the unamortized portion using the effective interest method and is recorded based on the timing of the payments received over the term of the Ultomiris and Monjuvi Royalty Sale Agreements. The actual interest rate will be affected by the timing of the royalty payments and changes in the forecasted revenue. Recent Accounting Pronouncements There have been no material changes in recently issued or adopted accounting standards from those disclosed in the Company's 2023 Annual Report on Form 10-K. The Company has reviewed all recently issued accounting pronouncements and does not believe they will have a material impact on our results of operations, financial condition or cash flows. There have been no other material changes to the significant accounting policies previously disclosed in the Company’s 2023 Annual Report on Form 10-K.

Restatement of Previously Issued Financial Statements

6 Months Ended

Jun. 30, 2024

Accounting Changes and Error Corrections [Abstract]

Restatement of Previously Issued Financial Statements

The impact of the restatement on the consolidated balance sheet as of June 30, 2024 is as follows (in thousands):


	June 30, 2024
	As Reported		Adjustment		As Restated
	(unaudited)
Assets




Accounts receivable	22,073		13,850		35,923
Prepaid expenses and other current assets	23,986		602		24,588
Total current assets	554,470		14,452		568,922








Total assets	$	826,167	$	14,452	$	840,619
Liabilities and stockholders’ equity
Current liabilities





Deferred income	36,472		(36,472)		—
Debt	6,947		31,983		38,930
Total current liabilities	80,076		(4,489)		75,587
Uncertain tax position payable	—		8,336		8,336

Deferred income, net of current portion	104,081		(104,081)		—
Debt, net of current portion	12,313		128,513		140,826
Total liabilities	263,626		28,279		291,905

Stockholders’ equity




Accumulated deficit	(598,368)		(13,827)		(612,195)


Total stockholders’ equity	562,541		(13,827)		548,714
Total liabilities and stockholders’ equity	$	826,167	$	14,452	$	840,619

The impact of the restatement on the consolidated statements of loss for the three months ended June 30, 2024 is as follows (in thousands):


	Three Months Ended June 30, 2024
	As Reported		Adjustment		As Restated

Revenue
Collaborations, milestones, and royalties	$	16,960	$	6,947	$	23,907




Loss from operations	(62,317)		6,947		(55,370)
Other income (expense)

Interest expense	(844)		(8,438)		(9,282)





Loss before income tax expense	(67,291)		(1,491)		(68,782)
Income tax expense	117		(117)		—
Net loss	(67,408)		(1,374)		(68,782)

Net loss attributable to non-controlling interest	(1,445)		—		(1,445)
Net loss attributable to Xencor, Inc.	$	(65,963)	$	(1,374)	$	(67,337)

Basic and diluted net loss per common share attributable to Xencor, Inc.	$	(1.07)	$	(0.02)	$	(1.09)

The impact of the restatement on the consolidated statement of loss for the six months ended June 30, 2024 is as follows (in thousands):


	Six Months Ended June 30, 2024
	As Reported		Adjustment		As Restated

Revenue
Collaborations, milestones, and royalties	$	29,765	$	10,139	$	39,904




Loss from operations	(120,172)		10,139		(110,033)
Other income (expense)

Interest expense	(1,921)		(17,037)		(18,958)



Total other income (expense), net	(15,828)		(17,037)		(32,865)

Loss before income tax expense	(136,000)		(6,898)		(142,898)
Income tax expense	117		(117)		—
Net loss	(136,117)		(6,781)		(142,898)

Net loss attributable to non-controlling interest	(2,121)		—		(2,121)
Net loss attributable to Xencor, Inc.	$	(133,996)	$	(6,781)	$	(140,777)

Basic and diluted net loss per common share attributable to Xencor, Inc.	$	(2.18)	$	(0.11)	$	(2.29)

The impact of the restatement on the consolidated statements of comprehensive loss for the three months ended June 30, 2024 is as follows (in thousands):


	Three Months Ended June 30, 2024
	As Reported		Adjustment		As Restated

Net loss	(67,408)		(1,374)		(68,782)
Other comprehensive loss
Net unrealized loss on marketable debt securities	(498)		—		(498)
Comprehensive loss	(67,906)		(1,374)		(69,280)
Comprehensive loss attributable to non-controlling interest	(1,445)		—		(1,445)
Comprehensive loss attributable to Xencor, Inc.	$	(66,461)	$	(1,374)	$	(67,835)

The impact of the restatement on the consolidated statement of comprehensive loss for the six months ended June 30, 2024 is as follows (in thousands):


	Six Months Ended June 30, 2024
	As Reported		Adjustment		As Restated

Net loss	(136,117)		(6,781)		(142,898)
Other comprehensive loss
Net unrealized loss on marketable debt securities	(1,942)		—		(1,942)
Comprehensive loss	(138,059)		(6,781)		(144,840)
Comprehensive loss attributable to non-controlling interest	(2,121)		—		(2,121)
Comprehensive loss attributable to Xencor, Inc.	$	(135,938)	$	(6,781)	$	(142,719)

The impact of the restatement on the consolidated statements of cash flows for the six months ended June 30, 2024 is as follows (in thousands):


	Six Months Ended June 30, 2024
	As Reported		Adjustment		As Restated
Cash flows from operating activities
Net loss	$	(136,117)	$	(6,781)	$	(142,898)
Adjustments to reconcile net loss to net cash used in operating activities:









Non-cash royalty revenue related to sale of future royalties	—		(30,855)		(30,855)
Non-cash interest expense	1,900		17,037		18,937
Changes in operating assets and liabilities:
Accounts receivable	(10,783)		790		(9,993)




Income taxes	(5,782)		(117)		(5,899)


Deferred income	(16,312)		16,312		—
Net cash used in operating activities	(120,595)		(3,614)		(124,209)









Cash flows from financing activities


Reduction of liability for sale of future royalties	(3,614)		3,614		—
Net cash (used in) provided by financing activities	(757)		3,614		2,857

Fair Value of Financial Instruments

6 Months Ended

Jun. 30, 2024

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

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


	June 30, 2024 (unaudited)						December 31, 2023
	Total Fair Value		Level 1		Level 2		Total Fair Value		Level 1		Level 2
Money Market Funds	$	11,624	$	11,624	$	—	$	25,520	$	25,520	$	—
Corporate Securities	211,657		—		211,657		228,723		—		228,723
Government Securities	342,577		—		342,577		414,514		—		414,514
	$	565,858	$	11,624	$	554,234	$	668,757	$	25,520	$	643,237

Net Loss Per Common Share

6 Months Ended

Jun. 30, 2024

Earnings Per Share [Abstract]

Net Loss Per Common Share

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


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
	(in thousands, except share and per share data)				(in thousands, except share and per share data)
	(As Restated)				(As Restated)
Numerator:
Net loss attributable to Xencor, Inc.	$	(67,337)	$	(21,954)	$	(140,777)	$	(82,717)
Denominator:


Weighted-average common shares outstanding used in computing basic and diluted net loss	61,676,444		59,807,558		61,444,384		59,922,784
Basic and diluted net loss per common share attributable to Xencor, Inc.	$	(1.09)	$	(0.37)	$	(2.29)	$	(1.38)

Comprehensive Loss	6 Months Ended
Comprehensive Loss	Jun. 30, 2024
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Comprehensive Loss	Comprehensive Loss Comprehensive loss is comprised of net loss and other comprehensive income (loss). For each of the three and six-month periods ended June 30, 2024 and 2023, the only component of other comprehensive income (loss) is net unrealized gain (loss) on marketable debt securities. There were no material reclassifications out of accumulated other comprehensive loss during each of the three and six-month periods ended June 30, 2024 and 2023.

Marketable Debt and Equity Securities

6 Months Ended

Jun. 30, 2024

Marketable Securities [Abstract]

Marketable Debt and Equity Securities

The Company’s marketable debt securities held as of June 30, 2024 and December 31, 2023 are summarized below:


June 30, 2024	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in thousands)
Money Market Funds	$	11,624	$	—	$	—	$	11,624
Corporate Securities	211,930		6		(279)		211,657
Government Securities	342,945		6		(374)		342,577
	$	566,499	$	12	$	(653)	$	565,858

Reported as
Cash and cash equivalents							$	11,624
Marketable securities							554,234
Total investments							$	565,858


December 31, 2023	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in thousands)
Money Market Funds	$	25,520	$	—	$	—	$	25,520
Corporate Securities	228,382		342		(1)		228,723
Government Securities	413,553		1,037		(76)		414,514
	$	667,455	$	1,379	$	(77)	$	668,757

Reported as
Cash and cash equivalents							$	25,520
Marketable securities							643,237
Total investments							$	668,757

The maturities of the Company’s marketable debt securities as of June 30, 2024 are as follows:


June 30, 2024	Amortized Cost		Estimated Fair Value
(in thousands)
Mature in one year or less	$	449,715	$	449,372
Mature within two years	105,160		104,862
	$	554,875	$	554,234

The unrealized losses on available-for-sale investments and their related fair values as of June 30, 2024 and December 31, 2023 are as follows:


	Less than 12 months				12 months or greater
June 30, 2024	Fair value		Unrealized losses		Fair value		Unrealized losses
(in thousands)
Corporate Securities	$	119,044	$	(217)	$	11,895	$	(62)
Government Securities	246,154		(132)		79,478		(242)
	$	365,198	$	(349)	$	91,373	$	(304)


	Less than 12 months				12 months or greater
December 31, 2023	Fair value		Unrealized losses		Fair value		Unrealized losses
(in thousands)
Corporate Securities	$	8,073	$	(1)	$	—	$	—
Government Securities	66,546		(76)		—		—
	$	74,619	$	(77)	$	—	$	—

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


	Fair Value		Fair Value
	June 30, 2024		December 31, 2023
Astria Common Stock	$	2,311	$	5,360
INmune Common Stock	16,630		21,231
Viridian Common Stock	9,330		15,619
	$	28,271	$	42,210

Below is a reconciliation of net gain (loss) recorded on equity securities during the three and six months ended June 30, 2024 and 2023:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Net gain (loss) recorded on equity securities	$	(12,027)	$	288	$	(9,702)	$	(2,610)
Less: Net gain (loss) recorded on sale of equity securities	(2,012)		—		827		—
Unrealized gain (loss) recorded on equity securities held at the reporting date	$	(10,015)	$	288	$	(10,529)	$	(2,610)


	Carrying Value		Carrying Value
	June 30, 2024		December 31, 2023

Zenas Preferred Stock	$	43,780	$	64,210

Stock-Based Compensation

6 Months Ended

Jun. 30, 2024

Share-Based Payment Arrangement [Abstract]

Stock-Based Compensation

Stock Based Compensation

Total employee, director and non-employee stock-based compensation expense recognized for the three and six months ended June 30, 2024 and 2023 are as follows (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
General and administrative	$	8,469	$	4,471	$	13,168	$	8,747
Research and development	8,721		9,092		15,443		17,415
	$	17,190	$	13,563	$	28,611	$	26,162


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Stock options	$	10,945	$	6,842	$	17,818	$	13,825
ESPP	211		341		417		663
RSUs	6,034		6,380		10,376		11,674
	$	17,190	$	13,563	$	28,611	$	26,162

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


	Number of Shares Subject to Outstanding Options	Weighted Average Exercise Price (Per Share)		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Balance at December 31, 2023	11,142,986	$	29.60	6.03	$	9,977
Options granted	2,167,253	$	22.43
Options forfeited	(485,918)	$	32.84
Options exercised	(162,895)	$	11.83
Balance at June 30, 2024	12,661,426	$	28.48	6.18	$	5,813
Exercisable	8,295,121	$	29.38	4.76	$	5,745

We calculate the intrinsic value as the difference between the exercise price of the options and the closing price of common stock of $18.93 per share as of June 30, 2024.

issuance date, with the following weighted average assumptions for the three and six months ended June 30, 2024 and 2023:


	Options				Options
	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Expected term (years)	6.4		6.5		6.4		6.1
Expected volatility	50.4	%	51.2	%	50.1	%	50.5	%
Risk-free interest rate	4.42	%	3.69	%	4.18	%	4.17	%
Expected dividend yield	—	%	—	%	—	%	—	%


	ESPP				ESPP
	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Expected term (years)	0.5 - 2.0		0.5 - 2.0		0.5 - 2.0		0.5 -2.0
Expected volatility	43.0% - 44.6%		38.2% - 55.7%		43.0% - 44.6%		38.2% - 55.7%
Risk-free interest rate	4.71% - 5.40%		0.13% - 5.39%		4.71% - 5.40%		0.13% - 5.39%
Expected dividend yield	—	%	—	%	—	%	—	%

The following table summarizes the RSU activity for the six-month period ended June 30, 2024:


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

Unvested RSUs at December 31, 2023	1,490,040	$	30.66
Granted	959,071	22.58
Vested	(550,972)	31.72
Forfeited	(119,483)	29.80
Unvested RSUs at June 30, 2024	1,778,656	$	26.02

As of June 30, 2024, the unamortized compensation expense related to unvested RSUs was $37.0 million. The remaining unamortized expense will be recognized over the next 2.1 years.

Leases

6 Months Ended

Jun. 30, 2024

Leases [Abstract]

Leases

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 June 30, 2024 to the operating lease liabilities recorded on the balance sheet (in thousands):


Years ending December 31,
For the remainder of 2024	$	2,792
2025	8,022
2026	9,238
2027	9,560
2028	9,076
2029	9,331
Thereafter	57,104
Total undiscounted lease payments	105,123
Less: Tenant allowance	(3,252)
Less: Imputed interest	(33,453)
Present value of lease payments	$	68,418

Lease liabilities - short-term	$	1,262
Lease liabilities - long-term	67,156
Total lease liabilities	$	68,418

The following table summarizes lease costs and cash payments for the three and six months ended June 30, 2024 and 2023 (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023

Operating lease cost	$	1,881	$	2,020	$	3,762	$	4,200
Variable lease cost	310		219		1,140		453
Total lease costs	$	2,191	$	2,239	$	4,902	$	4,653

Cash paid for amounts included in the measurement of lease liabilities	$	807	$	721	$	1,877	$	1,445

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	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 pursuant to certain 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 sheets for the periods ended June 30, 2024 and December 31, 2023. 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.

Collaboration and Licensing Agreements

6 Months Ended

Jun. 30, 2024

Collaboration and Licensing Agreements

Collaboration and Licensing Agreements

The following is a summary description of the material collaboration arrangements in the three and six months ended June 30, 2024 and 2023.

Alexion Pharmaceuticals, Inc.

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

Janssen Biotech, Inc., a Johnson & Johnson company

J&J Agreement

The Company did not recognize revenue for the three and six months ended June 30, 2024 and 2023 under the J&J Agreement. As of June 30, 2024, there is no deferred revenue related to this Agreement.

Second J&J Agreement

MorphoSys AG/Incyte Corporation

Shanghai Mabgeek Biotech Co., Ltd.

Vega Therapeutics, Inc.

Vir Biotechnology, Inc.

Zenas BioPharma, Inc.

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.

Third-Party Licensee

Gale Therapeutics Inc.

Revenues earned

The revenues recorded for the three and six months ended June 30, 2024 and 2023 were earned principally from the following licensees (in millions):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
	(As Restated)				(As Restated)
Alexion	$	13.8	$	11.2	$	26.4	$	21.6



Janssen	—		22.2		—		27.5
Mabgeek	$	1.5	$	—	$	1.5	$	—
MorphoSys	1.6		2.0		4.4		3.9


Vega	—		—		0.5		—
Vir	—		0.1		0.1		1.5
Viridian	$	—	$	—	$	—	$	—
Zenas	$	—	$	10.0	$	—	$	10.0
Third Party Licensee	$	7.0	$	—	$	7.0	$	—
Total	$	23.9	$	45.5	$	39.9	$	64.5

The table below summarizes the disaggregation of revenue recorded for the three and six months ended June 30, 2024 and 2023 (in millions):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
	(As Restated)				(As Restated)
Research collaboration	$	—	$	22.2	$	—	$	22.5
License	8.5		—		8.5		—
Milestone	—		10.0		0.5		15.0
Royalties	—		13.3		0.1		27.0
Non-cash royalties	15.4		—		30.8		—
Total	$	23.9	$	45.5	$	39.9	$	64.5

Remaining Performance Obligations and Deferred Revenue

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income taxes There is no provision for income tax for the three and six months ended June 30, 2024 or 2023. As of June 30, 2024, the Company’s deferred income tax assets are primarily comprised of deferred revenue, capitalized research and development expenses, federal and state tax net operating loss (NOL) carryforwards and research and development tax credit carryforwards, and have been fully offset by a valuation allowance.

Sales of Future Royalties

6 Months Ended

Jun. 30, 2024

Receivables [Abstract]

Sale of Future Royalties

Ultomiris Royalty Sale Agreement

Monjuvi Royalty Sale Agreement

The following table shows the activity within debt for the six months ended June 30, 2024 (in thousands):


	June 30, 2024
	(As Restated)
Beginning balance of debt related to sale of future royalties	$	189,483
Royalties owed to OMERS	834
Royalties paid to OMERS	(29,498)
Non-cash interest expense recognized	18,937
Ending balance of debt related to sale of future royalties	$	179,756

Debt - short-term	38,930
Debt - long-term	140,826
Total debt	$	179,756

Summary of Significant Accounting Policies (Polices)	6 Months Ended
Summary of Significant Accounting Policies (Polices)	Jun. 30, 2024
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated 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 consolidated 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 consolidated 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 consolidated 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 consolidated interim financial statements and related notes should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s 2023 Annual Report on Form 10-K/A filed with the Securities and Exchange Commission (SEC) on February 24, 2025.
Principles of Consolidation	Principles of Consolidation The accompanying consolidated financial statements include the accounts of Xencor, Inc. and Gale Therapeutics Inc. (Gale), a variable interest entity (VIE) in which we are the primary beneficiary. Since we own less than 100% of Gale, the Company records net loss attributable to non-controlling interests in its consolidated statements of loss equal to the percentage of the economic or ownership interests retained in Gale by the non-controlling party. In determining whether we are the primary beneficiary of a VIE, we apply a qualitative approach that determines whether we have (1) the power to direct the activities of the VIE that most significantly impact the entity's economic performance and (2) the obligation to absorb losses of, or the right to receive benefits from the VIE that could potentially be significant to the VIE. We continuously assess whether we are the primary beneficiary of Gale as changes to existing relationships or future transactions may result in us consolidating or deconsolidating Gale.
Use of Estimates	Use of Estimates The preparation of consolidated 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 income (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 consolidated interim financial statements include estimates made for royalty revenue, interest expense under the royalty sale agreements, 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.
Reclassifications	Reclassifications Certain prior year amounts in the consolidated financial statements and the notes thereto have been reclassified to conform to the current period's presentation. These reclassifications did not affect the prior period's total assets, liabilities, stockholders' equity, net loss or cash flows. During the six months ended June 30, 2024, we adopted a change in presentation on our consolidated statements of loss to include loss from disposal of fixed assets in operating expenses. The prior period has been revised to reflect this change in the presentation.
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 six months ended June 30, 2024 and 2023. 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 $0.4 million and $0.8 million of in-process intangible assets for the three and six months ended June 30, 2024. We abandoned $0.3 million and $0.6 million of in-process intangible assets during the three and six months ended June 30, 2023.
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 investment policy limits the maturity of any individual security to a maximum of 36 months. The average maturity of securities in the portfolio as of June 30, 2024 is less than 12 months. 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 six months ended June 30, 2024 and 2023. 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 six months ended June 30, 2024, the Company recorded an unrealized loss of $0.5 million and $1.9 million in its portfolio of marketable debt securities. During the three and six months ended June 30, 2023, the Company recorded an unrealized gain of $1.8 million and $5.1 million. The unrealized loss is due to the changing interest rate environment and is not due to changes in the credit quality of the underlying securities. The unrealized gain (loss) is recorded in other comprehensive income (loss) for the three and six months ended June 30, 2024 and 2023. 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 consolidated statements of 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 an impairment charge of $20.4 million recorded for the six months ended June 30, 2024 in connection with equity securities without a readily determinable fair value. There was no impairment charge recorded for the three and six months ended June 30, 2023.
Liability Related to the Sale of Future Revenues and Non-Cash Interest Expense on the Liability Related to the Sale of Future Royalties and Deferred Income Related to the Sale of Future Revenues	Liability Related to the Sale of Future Revenues We treat the sale of future Ultomiris and Monjuvi royalties as debt, amortized under the effective interest rate method over the estimated life of the Ultomiris and Monjuvi Royalty Sale Agreements, respectively. See Note 12. The amortization of the liability related to the sale of future Ultomiris and Monjuvi royalties is based on our current estimate of future royalty payments. Royalty revenue will be recognized as earned and the payments made will be a reduction of the liability when paid. Non-cash Interest Expense on the Liability Related to the Sale of Future Royalties The total expected royalty payments less the net proceeds received are recorded as non-cash interest expense over the life of the liability. Interest is imputed on the unamortized portion using the effective interest method and is recorded based on the timing of the payments received over the term of the Ultomiris and Monjuvi Royalty Sale Agreements. The actual interest rate will be affected by the timing of the royalty payments and changes in the forecasted revenue.
Recent Accounting Pronouncements	Recent Accounting Pronouncements There have been no material changes in recently issued or adopted accounting standards from those disclosed in the Company's 2023 Annual Report on Form 10-K. The Company has reviewed all recently issued accounting pronouncements and does not believe they will have a material impact on our results of operations, financial condition or cash flows. There have been no other material changes to the significant accounting policies previously disclosed in the Company’s 2023 Annual Report on Form 10-K.
Fair Value Measurement	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.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 six months ended June 30, 2024 and 2023, there were no transfers between Level 1 and Level 2.

Restatement of Previously Issued Financial Statements (Tables)

6 Months Ended

Jun. 30, 2024

Accounting Changes and Error Corrections [Abstract]

Schedule of Error Corrections and Prior Period Adjustments

The impact of the restatement on the consolidated balance sheet as of June 30, 2024 is as follows (in thousands):


	June 30, 2024
	As Reported		Adjustment		As Restated
	(unaudited)
Assets




Accounts receivable	22,073		13,850		35,923
Prepaid expenses and other current assets	23,986		602		24,588
Total current assets	554,470		14,452		568,922








Total assets	$	826,167	$	14,452	$	840,619
Liabilities and stockholders’ equity
Current liabilities





Deferred income	36,472		(36,472)		—
Debt	6,947		31,983		38,930
Total current liabilities	80,076		(4,489)		75,587
Uncertain tax position payable	—		8,336		8,336

Deferred income, net of current portion	104,081		(104,081)		—
Debt, net of current portion	12,313		128,513		140,826
Total liabilities	263,626		28,279		291,905

Stockholders’ equity




Accumulated deficit	(598,368)		(13,827)		(612,195)


Total stockholders’ equity	562,541		(13,827)		548,714
Total liabilities and stockholders’ equity	$	826,167	$	14,452	$	840,619

The impact of the restatement on the consolidated statements of loss for the three months ended June 30, 2024 is as follows (in thousands):


	Three Months Ended June 30, 2024
	As Reported		Adjustment		As Restated

Revenue
Collaborations, milestones, and royalties	$	16,960	$	6,947	$	23,907




Loss from operations	(62,317)		6,947		(55,370)
Other income (expense)

Interest expense	(844)		(8,438)		(9,282)





Loss before income tax expense	(67,291)		(1,491)		(68,782)
Income tax expense	117		(117)		—
Net loss	(67,408)		(1,374)		(68,782)

Net loss attributable to non-controlling interest	(1,445)		—		(1,445)
Net loss attributable to Xencor, Inc.	$	(65,963)	$	(1,374)	$	(67,337)

Basic and diluted net loss per common share attributable to Xencor, Inc.	$	(1.07)	$	(0.02)	$	(1.09)

The impact of the restatement on the consolidated statement of loss for the six months ended June 30, 2024 is as follows (in thousands):


	Six Months Ended June 30, 2024
	As Reported		Adjustment		As Restated

Revenue
Collaborations, milestones, and royalties	$	29,765	$	10,139	$	39,904




Loss from operations	(120,172)		10,139		(110,033)
Other income (expense)

Interest expense	(1,921)		(17,037)		(18,958)



Total other income (expense), net	(15,828)		(17,037)		(32,865)

Loss before income tax expense	(136,000)		(6,898)		(142,898)
Income tax expense	117		(117)		—
Net loss	(136,117)		(6,781)		(142,898)

Net loss attributable to non-controlling interest	(2,121)		—		(2,121)
Net loss attributable to Xencor, Inc.	$	(133,996)	$	(6,781)	$	(140,777)

Basic and diluted net loss per common share attributable to Xencor, Inc.	$	(2.18)	$	(0.11)	$	(2.29)

The impact of the restatement on the consolidated statements of comprehensive loss for the three months ended June 30, 2024 is as follows (in thousands):


	Three Months Ended June 30, 2024
	As Reported		Adjustment		As Restated

Net loss	(67,408)		(1,374)		(68,782)
Other comprehensive loss
Net unrealized loss on marketable debt securities	(498)		—		(498)
Comprehensive loss	(67,906)		(1,374)		(69,280)
Comprehensive loss attributable to non-controlling interest	(1,445)		—		(1,445)
Comprehensive loss attributable to Xencor, Inc.	$	(66,461)	$	(1,374)	$	(67,835)

The impact of the restatement on the consolidated statement of comprehensive loss for the six months ended June 30, 2024 is as follows (in thousands):


	Six Months Ended June 30, 2024
	As Reported		Adjustment		As Restated

Net loss	(136,117)		(6,781)		(142,898)
Other comprehensive loss
Net unrealized loss on marketable debt securities	(1,942)		—		(1,942)
Comprehensive loss	(138,059)		(6,781)		(144,840)
Comprehensive loss attributable to non-controlling interest	(2,121)		—		(2,121)
Comprehensive loss attributable to Xencor, Inc.	$	(135,938)	$	(6,781)	$	(142,719)

The impact of the restatement on the consolidated statements of cash flows for the six months ended June 30, 2024 is as follows (in thousands):


	Six Months Ended June 30, 2024
	As Reported		Adjustment		As Restated
Cash flows from operating activities
Net loss	$	(136,117)	$	(6,781)	$	(142,898)
Adjustments to reconcile net loss to net cash used in operating activities:









Non-cash royalty revenue related to sale of future royalties	—		(30,855)		(30,855)
Non-cash interest expense	1,900		17,037		18,937
Changes in operating assets and liabilities:
Accounts receivable	(10,783)		790		(9,993)




Income taxes	(5,782)		(117)		(5,899)


Deferred income	(16,312)		16,312		—
Net cash used in operating activities	(120,595)		(3,614)		(124,209)









Cash flows from financing activities


Reduction of liability for sale of future royalties	(3,614)		3,614		—
Net cash (used in) provided by financing activities	(757)		3,614		2,857

Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2024

Fair Value Disclosures [Abstract]

Schedule of Assets Recorded at Fair Value

The assets recorded at fair value are classified within the hierarchy as follows for the periods reported (in thousands):


	June 30, 2024 (unaudited)						December 31, 2023
	Total Fair Value		Level 1		Level 2		Total Fair Value		Level 1		Level 2
Money Market Funds	$	11,624	$	11,624	$	—	$	25,520	$	25,520	$	—
Corporate Securities	211,657		—		211,657		228,723		—		228,723
Government Securities	342,577		—		342,577		414,514		—		414,514
	$	565,858	$	11,624	$	554,234	$	668,757	$	25,520	$	643,237

Net Loss Per Common Share (Tables)

6 Months Ended

Jun. 30, 2024

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Net Loss per Common Share

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


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
	(in thousands, except share and per share data)				(in thousands, except share and per share data)
	(As Restated)				(As Restated)
Numerator:
Net loss attributable to Xencor, Inc.	$	(67,337)	$	(21,954)	$	(140,777)	$	(82,717)
Denominator:


Weighted-average common shares outstanding used in computing basic and diluted net loss	61,676,444		59,807,558		61,444,384		59,922,784
Basic and diluted net loss per common share attributable to Xencor, Inc.	$	(1.09)	$	(0.37)	$	(2.29)	$	(1.38)

Marketable Debt and Equity Securities (Tables)

6 Months Ended

Jun. 30, 2024

Marketable Securities [Abstract]

Schedule of Marketable Securities

The Company’s marketable debt securities held as of June 30, 2024 and December 31, 2023 are summarized below:


June 30, 2024	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in thousands)
Money Market Funds	$	11,624	$	—	$	—	$	11,624
Corporate Securities	211,930		6		(279)		211,657
Government Securities	342,945		6		(374)		342,577
	$	566,499	$	12	$	(653)	$	565,858

Reported as
Cash and cash equivalents							$	11,624
Marketable securities							554,234
Total investments							$	565,858


December 31, 2023	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in thousands)
Money Market Funds	$	25,520	$	—	$	—	$	25,520
Corporate Securities	228,382		342		(1)		228,723
Government Securities	413,553		1,037		(76)		414,514
	$	667,455	$	1,379	$	(77)	$	668,757

Reported as
Cash and cash equivalents							$	25,520
Marketable securities							643,237
Total investments							$	668,757

Schedule of Maturities of Marketable Securities

The maturities of the Company’s marketable debt securities as of June 30, 2024 are as follows:


June 30, 2024	Amortized Cost		Estimated Fair Value
(in thousands)
Mature in one year or less	$	449,715	$	449,372
Mature within two years	105,160		104,862
	$	554,875	$	554,234

Schedule of Unrealized Losses on Available-for-Sale Investments

The unrealized losses on available-for-sale investments and their related fair values as of June 30, 2024 and December 31, 2023 are as follows:


	Less than 12 months				12 months or greater
June 30, 2024	Fair value		Unrealized losses		Fair value		Unrealized losses
(in thousands)
Corporate Securities	$	119,044	$	(217)	$	11,895	$	(62)
Government Securities	246,154		(132)		79,478		(242)
	$	365,198	$	(349)	$	91,373	$	(304)


	Less than 12 months				12 months or greater
December 31, 2023	Fair value		Unrealized losses		Fair value		Unrealized losses
(in thousands)
Corporate Securities	$	8,073	$	(1)	$	—	$	—
Government Securities	66,546		(76)		—		—
	$	74,619	$	(77)	$	—	$	—

Schedule of Equity Securities with Readily Determinable Fair Value

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 June 30, 2024 and December 31, 2023 are as follows:


	Fair Value		Fair Value
	June 30, 2024		December 31, 2023
Astria Common Stock	$	2,311	$	5,360
INmune Common Stock	16,630		21,231
Viridian Common Stock	9,330		15,619
	$	28,271	$	42,210

Schedule of Net Gains and Losses

Below is a reconciliation of net gain (loss) recorded on equity securities during the three and six months ended June 30, 2024 and 2023:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Net gain (loss) recorded on equity securities	$	(12,027)	$	288	$	(9,702)	$	(2,610)
Less: Net gain (loss) recorded on sale of equity securities	(2,012)		—		827		—
Unrealized gain (loss) recorded on equity securities held at the reporting date	$	(10,015)	$	288	$	(10,529)	$	(2,610)

Schedule of Equity Securities Without Readily Determinable Fair Value

Equity securities without a readily determinable fair value and their carrying values (in thousands) as of June 30, 2024 and December 31, 2023 are as follows:


	Carrying Value		Carrying Value
	June 30, 2024		December 31, 2023

Zenas Preferred Stock	$	43,780	$	64,210

Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2024

Share-Based Payment Arrangement [Abstract]

Schedule of Total Employee, Director and Non-Employee Stock-Based Compensation Expense Recognized

Total employee, director and non-employee stock-based compensation expense recognized for the three and six months ended June 30, 2024 and 2023 are as follows (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
General and administrative	$	8,469	$	4,471	$	13,168	$	8,747
Research and development	8,721		9,092		15,443		17,415
	$	17,190	$	13,563	$	28,611	$	26,162


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Stock options	$	10,945	$	6,842	$	17,818	$	13,825
ESPP	211		341		417		663
RSUs	6,034		6,380		10,376		11,674
	$	17,190	$	13,563	$	28,611	$	26,162

Summary of Stock Option Activity

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


	Number of Shares Subject to Outstanding Options	Weighted Average Exercise Price (Per Share)		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Balance at December 31, 2023	11,142,986	$	29.60	6.03	$	9,977
Options granted	2,167,253	$	22.43
Options forfeited	(485,918)	$	32.84
Options exercised	(162,895)	$	11.83
Balance at June 30, 2024	12,661,426	$	28.48	6.18	$	5,813
Exercisable	8,295,121	$	29.38	4.76	$	5,745

Schedule of Weighted Average Assumptions Used for Estimation of Fair Value of Stock Options

We estimated the fair value of each equity award, including stock options and shares issued under our ESPP, using the Black-Scholes option-pricing model based on the date of grant of such stock option or ESPP share

issuance date, with the following weighted average assumptions for the three and six months ended June 30, 2024 and 2023:


	Options				Options
	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Expected term (years)	6.4		6.5		6.4		6.1
Expected volatility	50.4	%	51.2	%	50.1	%	50.5	%
Risk-free interest rate	4.42	%	3.69	%	4.18	%	4.17	%
Expected dividend yield	—	%	—	%	—	%	—	%

Schedule of Weighted Average Assumptions Used for Estimation of Fair Value of ESPP


	ESPP				ESPP
	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Expected term (years)	0.5 - 2.0		0.5 - 2.0		0.5 - 2.0		0.5 -2.0
Expected volatility	43.0% - 44.6%		38.2% - 55.7%		43.0% - 44.6%		38.2% - 55.7%
Risk-free interest rate	4.71% - 5.40%		0.13% - 5.39%		4.71% - 5.40%		0.13% - 5.39%
Expected dividend yield	—	%	—	%	—	%	—	%

Summary of Restricted Stock Unit Activity

The following table summarizes the RSU activity for the six-month period ended June 30, 2024:


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

Unvested RSUs at December 31, 2023	1,490,040	$	30.66
Granted	959,071	22.58
Vested	(550,972)	31.72
Forfeited	(119,483)	29.80
Unvested RSUs at June 30, 2024	1,778,656	$	26.02

Leases (Tables)

6 Months Ended

Jun. 30, 2024

Leases [Abstract]

Schedule of Operating Lease Liabilities Maturities

The following table reconciles the undiscounted cash flows for the operating leases at June 30, 2024 to the operating lease liabilities recorded on the balance sheet (in thousands):


Years ending December 31,
For the remainder of 2024	$	2,792
2025	8,022
2026	9,238
2027	9,560
2028	9,076
2029	9,331
Thereafter	57,104
Total undiscounted lease payments	105,123
Less: Tenant allowance	(3,252)
Less: Imputed interest	(33,453)
Present value of lease payments	$	68,418

Lease liabilities - short-term	$	1,262
Lease liabilities - long-term	67,156
Total lease liabilities	$	68,418

Summary of Lease Costs and Cash Disclosures

The following table summarizes lease costs and cash payments for the three and six months ended June 30, 2024 and 2023 (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023

Operating lease cost	$	1,881	$	2,020	$	3,762	$	4,200
Variable lease cost	310		219		1,140		453
Total lease costs	$	2,191	$	2,239	$	4,902	$	4,653

Cash paid for amounts included in the measurement of lease liabilities	$	807	$	721	$	1,877	$	1,445

Collaboration and Licensing Agreements (Tables)

6 Months Ended

Jun. 30, 2024

Collaboration and Licensing Agreements

Schedule of Revenue by Licensees

The revenues recorded for the three and six months ended June 30, 2024 and 2023 were earned principally from the following licensees (in millions):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
	(As Restated)				(As Restated)
Alexion	$	13.8	$	11.2	$	26.4	$	21.6



Janssen	—		22.2		—		27.5
Mabgeek	$	1.5	$	—	$	1.5	$	—
MorphoSys	1.6		2.0		4.4		3.9


Vega	—		—		0.5		—
Vir	—		0.1		0.1		1.5
Viridian	$	—	$	—	$	—	$	—
Zenas	$	—	$	10.0	$	—	$	10.0
Third Party Licensee	$	7.0	$	—	$	7.0	$	—
Total	$	23.9	$	45.5	$	39.9	$	64.5

Schedule of Disaggregation of Revenue

The table below summarizes the disaggregation of revenue recorded for the three and six months ended June 30, 2024 and 2023 (in millions):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
	(As Restated)				(As Restated)
Research collaboration	$	—	$	22.2	$	—	$	22.5
License	8.5		—		8.5		—
Milestone	—		10.0		0.5		15.0
Royalties	—		13.3		0.1		27.0
Non-cash royalties	15.4		—		30.8		—
Total	$	23.9	$	45.5	$	39.9	$	64.5

Sales of Future Royalties (Tables)

6 Months Ended

Jun. 30, 2024

Receivables [Abstract]

Debt of Future Royalties

The following table shows the activity within debt for the six months ended June 30, 2024 (in thousands):


	June 30, 2024
	(As Restated)
Beginning balance of debt related to sale of future royalties	$	189,483
Royalties owed to OMERS	834
Royalties paid to OMERS	(29,498)
Non-cash interest expense recognized	18,937
Ending balance of debt related to sale of future royalties	$	179,756

Debt - short-term	38,930
Debt - long-term	140,826
Total debt	$	179,756

Summary of Significant Accounting Policies (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Patents, licenses, and other intangible assets
Impairment of intangible assets	$ 0	$ 0	$ 0	$ 0
Abandonment of capitalized intangible assets			784,000	594,000
Impairment loss or recoveries	0	0	0	0
Net unrealized gain (loss) on marketable securities	(500,000)	1,800,000	(1,900,000)	5,100,000
Impairment on equity securities	(220,000)	0	20,430,000	0
In-process intangible assets
Patents, licenses, and other intangible assets
Abandonment of capitalized intangible assets	$ 400,000	$ 300,000	$ 800,000	$ 600,000

Restatement of Previously Issued Financial Statements - Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Reclassification [Line Items]
Accounts receivable	$ 35,923		$ 23,739
Prepaid expenses and other current assets	24,588		18,139
Total current assets	568,922		635,603
Total assets	840,619		965,135
Income tax payable	0		5,291
Deferred revenue	0			$ 7,900
Debt	38,930		27,711
Total current liabilities	75,587		73,915
Uncertain tax position payable	8,336		8,336
Deferred income, net of current portion	0
Debt, net of current portion	140,826		161,772
Total liabilities	291,905		303,048
Accumulated deficit	(612,195)		(471,418)
Total stockholders’ equity	548,714	$ 599,734	662,087	$ 678,876	$ 683,583	$ 727,496
Total liabilities and stockholders’ equity	840,619		$ 965,135
As Reported
Reclassification [Line Items]
Accounts receivable	22,073
Prepaid expenses and other current assets	23,986
Total current assets	554,470
Total assets	826,167
Deferred revenue	36,472
Debt	6,947
Total current liabilities	80,076
Uncertain tax position payable	0
Deferred income, net of current portion	104,081
Debt, net of current portion	12,313
Total liabilities	263,626
Accumulated deficit	(598,368)
Total stockholders’ equity	562,541
Total liabilities and stockholders’ equity	826,167
Adjustment
Reclassification [Line Items]
Accounts receivable	13,850
Prepaid expenses and other current assets	602
Total current assets	14,452
Total assets	14,452
Deferred revenue	(36,472)
Debt	31,983
Total current liabilities	(4,489)
Uncertain tax position payable	8,336
Deferred income, net of current portion	(104,081)
Debt, net of current portion	128,513
Total liabilities	28,279
Accumulated deficit	(13,827)
Total stockholders’ equity	(13,827)
Total liabilities and stockholders’ equity	$ 14,452

Restatement of Previously Issued Financial Statements - Income Statement (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Reclassification [Line Items]
Collaborations, milestones, and royalties	$ 23,907,000	$ 45,523,000	$ 39,904,000	$ 64,485,000
Loss from operations	(55,370,000)	(25,997,000)	(110,033,000)	(86,740,000)
Interest expense	(9,282,000)	(7,000)	(18,958,000)	(14,000)
Loss before income tax expense	(68,782,000)		142,898,000
Total other income (expense), net	(13,412,000)	4,043,000	(32,865,000)	4,023,000
Income tax expense	0	0	0	0
Net loss	(68,782,000)	(21,954,000)	(142,898,000)	(82,717,000)
Net loss attributable to non-controlling interest	(1,445,000)	0	(2,121,000)	0
Net loss attributable to Xencor, Inc.	$ (67,337,000)	$ (21,954,000)	$ (140,777,000)	$ (82,717,000)
Diluted net loss per common share attributable to Xencor, Inc. (in dollars per share)	$ (1.09)	$ (0.37)	$ (2.29)	$ (1.38)
Basic net loss per common share attributable to Xencor, Inc. (in dollars per share)	$ (1.09)	$ (0.37)	$ (2.29)	$ (1.38)
As Reported
Reclassification [Line Items]
Collaborations, milestones, and royalties	$ 16,960,000		$ 29,765,000
Loss from operations	(62,317,000)		(120,172,000)
Interest expense	(844,000)		(1,921,000)
Loss before income tax expense	(67,291,000)		136,000,000
Total other income (expense), net			(15,828,000)
Income tax expense	117,000		117,000
Net loss	(67,408,000)		(136,117,000)
Net loss attributable to non-controlling interest	(1,445,000)		(2,121,000)
Net loss attributable to Xencor, Inc.	$ (65,963,000)		$ (133,996,000)
Diluted net loss per common share attributable to Xencor, Inc. (in dollars per share)	$ (1.07)		$ (2.18)
Basic net loss per common share attributable to Xencor, Inc. (in dollars per share)	$ (1.07)		$ (2.18)
Adjustment
Reclassification [Line Items]
Collaborations, milestones, and royalties	$ 6,947,000		$ 10,139,000
Loss from operations	6,947,000		10,139,000
Interest expense	(8,438,000)		(17,037,000)
Loss before income tax expense	(1,491,000)		6,898,000
Total other income (expense), net			(17,037,000)
Income tax expense	(117,000)		(117,000)
Net loss	(1,374,000)		(6,781,000)
Net loss attributable to non-controlling interest	0		0
Net loss attributable to Xencor, Inc.	$ (1,374,000)		$ (6,781,000)
Diluted net loss per common share attributable to Xencor, Inc. (in dollars per share)	$ (0.02)		$ (0.11)
Basic net loss per common share attributable to Xencor, Inc. (in dollars per share)	$ (0.02)		$ (0.11)

Restatement of Previously Issued Financial Statements - Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Reclassification [Line Items]
Net loss	$ (68,782)		$ (21,954)		$ (142,898)	$ (82,717)
Net unrealized gain (loss) on marketable debt securities	(498)		1,765		(1,942)	5,093
Comprehensive income (loss)	(69,280)	$ (75,561)	(20,189)	$ (57,436)	(144,840)	(77,624)
Comprehensive loss attributable to non-controlling interest	(1,445)		0		(2,121)	0
Comprehensive loss attributable to Xencor, Inc.	(67,835)		$ (20,189)		(142,719)	$ (77,624)
As Reported
Reclassification [Line Items]
Net loss	(67,408)				(136,117)
Net unrealized gain (loss) on marketable debt securities	(498)				(1,942)
Comprehensive income (loss)	(67,906)				(138,059)
Comprehensive loss attributable to non-controlling interest	(1,445)				(2,121)
Comprehensive loss attributable to Xencor, Inc.	(66,461)				(135,938)
Adjustment
Reclassification [Line Items]
Net loss	(1,374)				(6,781)
Net unrealized gain (loss) on marketable debt securities	0				0
Comprehensive income (loss)	(1,374)				(6,781)
Comprehensive loss attributable to non-controlling interest	0				0
Comprehensive loss attributable to Xencor, Inc.	$ (1,374)				$ (6,781)

Restatement of Previously Issued Financial Statements - Cash Flow (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Reclassification [Line Items]
Net loss	$ (68,782)	$ (21,954)	$ (142,898)	$ (82,717)
Non-cash royalty revenue related to sale of future royalties	(30,855)		(30,855)	0
Non-cash interest expense			18,937
Accounts receivable			(9,993)	8,978
Income taxes			(5,899)
Deferred income			0
Net cash used in operating activities			(124,209)	(68,814)
Reduction of liability for sale of future royalties			0
Net cash provided by financing activities			2,857	$ 2,843
As Reported
Reclassification [Line Items]
Net loss	(67,408)		(136,117)
Non-cash royalty revenue related to sale of future royalties	0
Non-cash interest expense			1,900
Accounts receivable			(10,783)
Income taxes			(5,782)
Deferred income			(16,312)
Net cash used in operating activities			(120,595)
Reduction of liability for sale of future royalties			(3,614)
Net cash provided by financing activities			(757)
Adjustment
Reclassification [Line Items]
Net loss	(1,374)		(6,781)
Non-cash royalty revenue related to sale of future royalties	$ (30,855)
Non-cash interest expense			17,037
Accounts receivable			790
Income taxes			(117)
Deferred income			16,312
Net cash used in operating activities			(3,614)
Reduction of liability for sale of future royalties			3,614
Net cash provided by financing activities			$ 3,614

Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Fair Value of Financial Instruments
Money Market Funds	$ 30,768	$ 53,790	$ 34,710
Marketable securities	554,234
Fair Value, Recurring
Fair Value of Financial Instruments
Total Fair Value	565,858	668,757
Money Market Funds
Fair Value of Financial Instruments
Money Market Funds	11,624	25,520
Money Market Funds \| Fair Value, Recurring
Fair Value of Financial Instruments
Money Market Funds	11,624	25,520
Corporate Securities
Fair Value of Financial Instruments
Marketable securities	211,657	228,723
Corporate Securities \| Fair Value, Recurring
Fair Value of Financial Instruments
Marketable securities	211,657	228,723
Government Securities
Fair Value of Financial Instruments
Marketable securities	342,577	414,514
Government Securities \| Fair Value, Recurring
Fair Value of Financial Instruments
Marketable securities	342,577	414,514
Level 1 \| Fair Value, Recurring
Fair Value of Financial Instruments
Total Fair Value	11,624	25,520
Level 1 \| Money Market Funds \| Fair Value, Recurring
Fair Value of Financial Instruments
Money Market Funds	11,624	25,520
Level 1 \| Corporate Securities \| Fair Value, Recurring
Fair Value of Financial Instruments
Marketable securities	0	0
Level 1 \| Government Securities \| Fair Value, Recurring
Fair Value of Financial Instruments
Marketable securities	0	0
Level 2 \| Fair Value, Recurring
Fair Value of Financial Instruments
Total Fair Value	554,234	643,237
Level 2 \| Money Market Funds \| Fair Value, Recurring
Fair Value of Financial Instruments
Money Market Funds	0	0
Level 2 \| Corporate Securities \| Fair Value, Recurring
Fair Value of Financial Instruments
Marketable securities	211,657	228,723
Level 2 \| Government Securities \| Fair Value, Recurring
Fair Value of Financial Instruments
Marketable securities	$ 342,577	$ 414,514

Net Loss Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Numerator:
Net loss attributable to Xencor, Inc.	$ (67,337)	$ (21,954)	$ (140,777)	$ (82,717)
Denominator:
Weighted-average common shares outstanding used in computing basic net loss (in shares)	61,676,444	59,807,558	61,444,384	59,922,784
Weighted-average common shares outstanding used in computing diluted net loss (in shares)	61,676,444	59,807,558	61,444,384	59,922,784
Basic net loss per common share attributable to Xencor, Inc. (in dollars per share)	$ (1.09)	$ (0.37)	$ (2.29)	$ (1.38)
Diluted net loss per common share attributable to Xencor, Inc. (in dollars per share)	$ (1.09)	$ (0.37)	$ (2.29)	$ (1.38)

Marketable Debt and Equity Securities - Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Schedule of Available-for-sale Securities
Money Market Funds	$ 30,768	$ 53,790	$ 34,710
Amortized Cost	554,875
Amortized Cost	566,499	667,455
Gross Unrealized Gains	12	1,379
Gross Unrealized Losses	(653)	(77)
Marketable securities	554,234
Total investments	565,858	668,757
Money Market Funds
Schedule of Available-for-sale Securities
Money Market Funds	11,624	25,520
Corporate Securities
Schedule of Available-for-sale Securities
Amortized Cost	211,930	228,382
Gross Unrealized Gains	6	342
Gross Unrealized Losses	(279)	(1)
Marketable securities	211,657	228,723
Government Securities
Schedule of Available-for-sale Securities
Amortized Cost	342,945	413,553
Gross Unrealized Gains	6	1,037
Gross Unrealized Losses	(374)	(76)
Marketable securities	342,577	414,514
Cash and cash equivalents
Schedule of Available-for-sale Securities
Money Market Funds	11,624	25,520
Marketable securities
Schedule of Available-for-sale Securities
Marketable securities	$ 554,234	$ 643,237

Marketable Debt and Equity Securities - Maturities (Details) $ in Thousands	Jun. 30, 2024 USD ($)
Amortized Cost
Mature in one year or less	$ 449,715
Mature within two years	105,160
Amortized Cost	554,875
Estimated Fair Value
Mature in one year or less	449,372
Mature within two years	104,862
Estimated Fair Value	$ 554,234

Marketable Debt and Equity Securities - Unrealized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities
Fair value, less than 12 months	$ 365,198	$ 74,619
Unrealized losses, Less than 12 months	(349)	(77)
Fair value, 12 months or greater	91,373	0
Unrealized losses, 12 months or greater	(304)	0
Corporate Securities
Schedule of Available-for-sale Securities
Fair value, less than 12 months	119,044	8,073
Unrealized losses, Less than 12 months	(217)	(1)
Fair value, 12 months or greater	11,895	0
Unrealized losses, 12 months or greater	(62)	0
Government Securities
Schedule of Available-for-sale Securities
Fair value, less than 12 months	246,154	66,546
Unrealized losses, Less than 12 months	(132)	(76)
Fair value, 12 months or greater	79,478	0
Unrealized losses, 12 months or greater	$ (242)	$ 0

Marketable Debt and Equity Securities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Schedule of Available-for-sale Securities
Net gain (loss) recorded on equity securities	$ (12,027)	$ 288	$ (9,702)	$ (2,610)
Unrealized gain (loss) on equity securities	(10,015)	288	(10,529)	(2,610)
Impairment on equity securities	$ 220	0	(20,430)	0
Zenas
Schedule of Available-for-sale Securities
Impairment on equity securities			$ (20,400)
Astria \| Common Stock \| License
Schedule of Available-for-sale Securities
Sale of common stock (in shares)	443,909		443,909
Number of shares owned (in shares)	253,958		253,958
Astria/Catabasis \| Technology License Agreement
Schedule of Available-for-sale Securities
Unrealized gain (loss) on equity securities	$ (1,300)	(3,500)	$ 400	(3,900)
INmune \| License
Schedule of Available-for-sale Securities
Unrealized gain (loss) on equity securities	$ (5,500)	4,900	$ (4,600)	5,200
INmune \| Common Stock \| License
Schedule of Available-for-sale Securities
Number of shares owned (in shares)	1,885,533		1,885,533
Viridian \| Technology License Agreement
Schedule of Available-for-sale Securities
Unrealized gain (loss) on equity securities	$ (3,200)	$ (1,200)	$ (6,300)	$ (3,900)
Viridian \| Common Stock \| Technology License Agreement
Schedule of Available-for-sale Securities
Number of shares owned (in shares)	717,144		717,144

Marketable Debt and Equity Securities - Equity Securities with Readily Determinable Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Equity Securities
Equity securities with readily determinable fair value	$ 28,271	$ 42,210
Common Stock
Equity Securities
Equity securities with readily determinable fair value	28,271	42,210
Astria \| Common Stock
Equity Securities
Equity securities with readily determinable fair value	2,311	5,360
INmune \| Common Stock
Equity Securities
Equity securities with readily determinable fair value	16,630	21,231
Viridian \| Common Stock
Equity Securities
Equity securities with readily determinable fair value	$ 9,330	$ 15,619

Marketable Debt and Equity Securities - Net Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Marketable Securities [Abstract]
Net gain (loss) recorded on equity securities	$ (12,027)	$ 288	$ (9,702)	$ (2,610)
Less: Net gain (loss) recorded on sale of equity securities	(2,012)	0	827	0
Unrealized gain (loss) recorded on equity securities held at the reporting date	$ (10,015)	$ 288	$ (10,529)	$ (2,610)

Marketable Debt and Equity Securities - Equity Securities without Readily Determinable Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Preferred Stock \| Zenas
Equity securities without readily determinable fair value
Equity shares estimated fair value	$ 43,780	$ 64,210

Stock Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($) installment $ / shares shares	Jun. 30, 2023 $ / shares shares	Jun. 14, 2023 shares
ESPP
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total number of shares of common stock available for issuance (in shares)	987,344
Awards issued under the plan (in shares)	787,474
Unamortized compensation expense \| $	$ 1.3
Period to recognize unamortized compensation expense	1 year 4 months 24 days
ESPP \| Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
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
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted (in shares)	959,071
Annual installment vesting periods \| installment	3
Period to recognize unamortized compensation expense	2 years 1 month 6 days
Unamortized compensation expense related to unvested restricted stock units \| $	$ 37.0
Stock options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Options granted (in shares)	2,167,253	1,941,412
Closing price of common stock (in dollars per share) \| $ / shares	$ 18.93
Weighted average fair value of options granted (in dollars per share) \| $ / shares	$ 22.43	$ 30.65
Unamortized compensation expense \| $	$ 56.9
Period to recognize unamortized compensation expense	2 years 8 months 12 days
The 2023 Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total number of shares of common stock available for issuance (in shares)	18,721,104		3,000,000
The 2023 Plan \| RSUs
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted (in shares)	1,045,738
The 2013 and 2023 Plans
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Options granted (in shares)	2,380,651
Extended Vesting Periods
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment arrangement, plan modification, incremental cost \| $	$ 1.2
Extended Expiration Dates
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment arrangement, plan modification, incremental cost \| $	$ 3.1

Stock-Based Compensation - Employee Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total employee, director and non-employee stock-based compensation expense	$ 17,190	$ 13,563	$ 28,611	$ 26,162
Stock options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total employee, director and non-employee stock-based compensation expense	10,945	6,842	17,818	13,825
ESPP
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total employee, director and non-employee stock-based compensation expense	211	341	417	663
RSUs
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total employee, director and non-employee stock-based compensation expense	6,034	6,380	10,376	11,674
General and administrative
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total employee, director and non-employee stock-based compensation expense	8,469	4,471	13,168	8,747
Research and development
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total employee, director and non-employee stock-based compensation expense	$ 8,721	$ 9,092	$ 15,443	$ 17,415

Stock-Based Compensation - Option Activity (Details) - Stock options - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Number of Shares Subject to Outstanding Options
Balance at the beginning of the period (in shares)	11,142,986
Options granted (in shares)	2,167,253	1,941,412
Options forfeited (in shares)	(485,918)
Options exercised (in shares)	(162,895)
Balance at the end of the period (in shares)	12,661,426		11,142,986
Exercisable options (in shares)	8,295,121
Weighted Average Exercise Price (Per Share)
Balance at the beginning of the period (in dollars per share)	$ 29.60
Options granted (in dollars per share)	22.43
Options forfeited (in dollars per share)	32.84
Options exercised (in dollars per share)	11.83
Balance at the end of the period (in dollars per share)	28.48		$ 29.60
Exercisable (in dollars per share)	$ 29.38
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-average remaining contractual term, balance outstanding	6 years 2 months 4 days		6 years 10 days
Weighted-average remaining contractual term, exercisable	4 years 9 months 3 days
Aggregate intrinsic value, balance outstanding	$ 5,813		$ 9,977
Aggregate intrinsic value, exercisable	$ 5,745

Stock-Based Compensation - FV of Employee Stock Options (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Stock options
Weighted average assumptions for estimated fair value of employee stock options
Expected term (years)	6 years 4 months 24 days	6 years 6 months	6 years 4 months 24 days	6 years 1 month 6 days
Expected volatility (as a percent)	50.40%	51.20%	50.10%	50.50%
Risk-free interest rate (as a percent)	4.42%	3.69%	4.18%	4.17%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
ESPP
Weighted average assumptions for estimated fair value of employee stock options
Expected volatility, low end of range (as a percent)	43.00%	38.20%	43.00%	38.20%
Expected volatility, high end of range (as a percent)	44.60%	55.70%	44.60%	55.70%
Risk-free interest rate, low end of range (as a percent)	4.71%	0.13%	4.71%	0.13%
Risk-free interest rate, high end of range (as a percent)	5.40%	5.39%	5.40%	5.39%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
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

Stock Based Compensation - Restricted Stock Units (Details) - RSUs	6 Months Ended
	Jun. 30, 2024 $ / shares shares
Restricted Stock Units
Beginning balance (in shares) \| shares	1,490,040
Granted (in shares) \| shares	959,071
Vested (in shares) \| shares	(550,972)
Forfeited (in shares) \| shares	(119,483)
Ending balance (in shares) \| shares	1,778,656
Weighted Average Grant Date Fair Value (Per unit)
Weighted average grant date fair value, beginning balance (in dollars per share) \| $ / shares	$ 30.66
Weighted average grant date fair value, granted (in dollars per share) \| $ / shares	22.58
Weighted average grant date fair value, vested (in dollars per share) \| $ / shares	31.72
Weighted average grant date fair value, forfeited (in dollars per share) \| $ / shares	29.80
Weighted average grant date fair value, ending balance (in dollars per share) \| $ / shares	$ 26.02

Leases - Agreements (Details) $ in Thousands	1 Months Ended
Leases - Agreements (Details) $ in Thousands	Jan. 31, 2024 USD ($)	Jun. 30, 2021 phase	Sep. 30, 2026 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Aug. 31, 2022 USD ($)	Aug. 01, 2022 USD ($)
Lessee, Lease, Description [Line Items]
Payments for (proceeds from) tenant allowance	$ 700
Cash collateral for letters of credit				$ 384	$ 380
Letter of Credit
Lessee, Lease, Description [Line Items]
Letter of credit amount				$ 400
Monrovia, CA - office and laboratory space
Lessee, Lease, Description [Line Items]
Renewal term				5 years
Pasadena, CA - office and laboratory space
Lessee, Lease, Description [Line Items]
Phases of lease term \| phase		2
Improvement allowance						$ 5,000	$ 17,000
Forecast \| Pasadena, CA - office and laboratory space
Lessee, Lease, Description [Line Items]
Improvement allowance			$ 3,300

Leases - Undiscounted Cash Flows (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Leases [Abstract]
For the remainder of 2024	$ 2,792
2025	8,022
2026	9,238
2027	9,560
2028	9,076
2029	9,331
Thereafter	57,104
Total undiscounted lease payments	105,123
Less: Tenant allowance	(3,252)
Less: Imputed interest	(33,453)
Present value of lease payments	68,418
Lease liabilities - short-term	1,262	$ 3,435
Lease liabilities - long-term	$ 67,156	$ 59,025

Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Leases - Lease Costs (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Leases [Abstract]
Operating lease cost	$ 1,881	$ 2,020	$ 3,762	$ 4,200
Variable lease cost	310	219	1,140	453
Total lease costs	2,191	2,239	4,902	4,653
Cash paid for amounts included in the measurement of lease liabilities	$ 807	$ 721	$ 1,877	$ 1,445
Remaining lease term	10 years 8 months 12 days	11 years 8 months 12 days	10 years 8 months 12 days	11 years 8 months 12 days
Discount rate	7.00%	8.90%	7.00%	8.90%

Collaboration and Licensing Agreements - Narrative (Details)		1 Months Ended				3 Months Ended			6 Months Ended
	Oct. 01, 2021	Jul. 31, 2024 USD ($)	Oct. 31, 2021 USD ($)	Feb. 28, 2019 USD ($)	Jan. 31, 2013 program	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2019 target	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Collaboration research and licensing agreements
Receivable						$ 35,923,000			$ 35,923,000		$ 23,739,000
Unrealized gain (loss) on equity securities						(10,015,000)	$ 288,000		(10,529,000)	$ (2,610,000)
Impairment on equity securities						(220,000)	0		20,430,000	0
Deferred revenue						0	7,900,000		0	7,900,000
Collaborations, milestones, and royalties						23,907,000	45,523,000		39,904,000	64,485,000
Royalties
Collaboration research and licensing agreements
Collaborations, milestones, and royalties						0	13,300,000		100,000	27,000,000.0
Milestone
Collaboration research and licensing agreements
Collaborations, milestones, and royalties						0	10,000,000.0		500,000	15,000,000.0
Alexion
Collaboration research and licensing agreements
Collaborations, milestones, and royalties						13,800,000	11,200,000		26,400,000	21,600,000
MorphoSys
Collaboration research and licensing agreements
Collaborations, milestones, and royalties						1,600,000	2,000,000.0		4,400,000	3,900,000
Mabgeek
Collaboration research and licensing agreements
Collaborations, milestones, and royalties						1,500,000	0		1,500,000	0
Vir
Collaboration research and licensing agreements
Collaborations, milestones, and royalties						0	100,000		100,000	1,500,000
Zenas
Collaboration research and licensing agreements
Impairment on equity securities							0		20,400,000	0
Collaborations, milestones, and royalties						0	10,000,000.0		0	10,000,000.0
Zenas \| Preferred Stock
Collaboration research and licensing agreements
Equity shares estimated fair value						43,780,000			43,780,000		64,210,000
Third Party Licensee
Collaboration research and licensing agreements
Collaborations, milestones, and royalties						7,000,000.0	0		7,000,000.0	0
Option and License agreement \| Alexion
Collaboration research and licensing agreements
Number of different target programs \| program					1
Receivable						13,800,000			13,800,000
Deferred revenue						0			0
Option and License agreement \| Alexion \| Royalties
Collaboration research and licensing agreements
Revenue recognized						13,800,000	11,200,000		26,400,000	21,600,000
Technology License Agreement \| Mabgeek
Collaboration research and licensing agreements
Deferred revenue						0			0
Collaborations, milestones, and royalties						1,500,000			1,500,000
Technology License Agreement \| Vega
Collaboration research and licensing agreements
Revenue recognized			$ 500,000
Collaborations, milestones, and royalties						0	0		500,000	0
Technology License Agreement \| Gale
Collaboration research and licensing agreements
Transaction price						7,500,000			7,500,000
Service agreement charges						4,600,000			8,000,000.0
Technology License Agreement \| Gale \| Subsequent Event
Collaboration research and licensing agreements
Payments for repurchase of preferred stock and preference stock		$ 3,000,000.0
Collaboration and License Agreement \| Genentech
Collaboration research and licensing agreements
Revenue recognized						0	0		0	0
Initial cost-sharing percentage				45.00%
Royalty milestones				$ 600,000,000
Collaboration and License Agreement \| Genentech \| Development-based
Collaboration research and licensing agreements
Royalty milestones				115,000,000
Collaboration and License Agreement \| Genentech \| Regulatory-based
Collaboration research and licensing agreements
Royalty milestones				185,000,000
Collaboration and License Agreement \| Genentech \| Sales-based
Collaboration research and licensing agreements
Royalty milestones				$ 300,000,000
Collaboration and License Agreement \| Genentech \| XmAb24306
Collaboration research and licensing agreements
Collaborative arrangement receivable (payable) related to cost sharing development activities						(7,600,000)			(7,600,000)
Collaboration and License Agreement \| Genentech \| Research service
Collaboration research and licensing agreements
Deferred revenue						0			0
Collaboration and License Agreement \| Janssen
Collaboration research and licensing agreements
Revenue recognized						0	0		0	0
Deferred revenue						0			0
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
Revenue recognized						1,600,000	2,000,000.0		4,400,000	3,900,000
Receivable						2,100,000			2,100,000
License \| Zenas
Collaboration research and licensing agreements
Revenue recognized						0	10,000,000.0		0	10,000,000.0
Deferred revenue						0			0
License \| Zenas \| Milestone \| Preferred Stock
Collaboration research and licensing agreements
Equity shares estimated fair value											$ 10,000,000.0
Second Collaboration And License Agreement \| Janssen
Collaboration research and licensing agreements
Revenue recognized						0	22,200,000		0	27,500,000
Receivable						5,200,000			5,200,000
Deferred revenue						0			0
Research license term	2 years
Second Collaboration And License Agreement \| Janssen \| Maximum
Collaboration research and licensing agreements
Percentage of responsibility for development costs	20.00%
Second Collaboration And License Agreement \| Janssen \| Minimum
Collaboration research and licensing agreements
Share development percentage	80.00%
Patent License Agreement \| Vir
Collaboration research and licensing agreements
Number of different target programs \| target								2
Receivable						0			0
Deferred revenue						0			0
Patent License Agreement \| Vir \| Royalties
Collaboration research and licensing agreements
Revenue recognized							$ 100,000		100,000	$ 1,500,000
Patent License Agreement \| Third Party Licensee
Collaboration research and licensing agreements
Receivable						7,000,000.0			7,000,000.0
Deferred revenue						0			0
Collaborations, milestones, and royalties						$ 7,000,000.0			$ 7,000,000.0

Collaboration and Licensing Agreements - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Collaboration research and licensing agreements
Revenue recorded	$ 23,907	$ 45,523	$ 39,904	$ 64,485
Research collaboration
Collaboration research and licensing agreements
Revenue recorded	0	22,200	0	22,500
License
Collaboration research and licensing agreements
Revenue recorded	8,500	0	8,500	0
Milestone
Collaboration research and licensing agreements
Revenue recorded	0	10,000	500	15,000
Royalties
Collaboration research and licensing agreements
Revenue recorded	0	13,300	100	27,000
Non-cash royalties
Collaboration research and licensing agreements
Revenue recorded	15,400	0	30,800	0
Alexion
Collaboration research and licensing agreements
Revenue recorded	13,800	11,200	26,400	21,600
Janssen
Collaboration research and licensing agreements
Revenue recorded	0	22,200	0	27,500
Mabgeek
Collaboration research and licensing agreements
Revenue recorded	1,500	0	1,500	0
Mabgeek \| Technology License Agreement
Collaboration research and licensing agreements
Revenue recorded	1,500		1,500
MorphoSys
Collaboration research and licensing agreements
Revenue recorded	1,600	2,000	4,400	3,900
Vega \| Technology License Agreement
Collaboration research and licensing agreements
Revenue recorded	0	0	500	0
Vir
Collaboration research and licensing agreements
Revenue recorded	0	100	100	1,500
Viridian \| Technology License Agreement
Collaboration research and licensing agreements
Revenue recorded	0	0	0	0
Zenas
Collaboration research and licensing agreements
Revenue recorded	0	10,000	0	10,000
Third Party Licensee
Collaboration research and licensing agreements
Revenue recorded	$ 7,000	$ 0	$ 7,000	$ 0

Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($)	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Income tax expense	$ 0	$ 0	$ 0	$ 0

Sales of Future Royalties - Narrative (Details) - Royalties	3 Months Ended	6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)
Alexion \| Option and License agreement
Sales of Future Royalties [Line Items]
Non-cash revenue recognized	$ 13,800,000	$ 26,400,000
Deferred revenue		0.211
Alexion \| Collaboration and License Agreement
Sales of Future Royalties [Line Items]
Non-cash interest expense recognized	8,400,000	17,000,000.0
MorphoSys \| Collaboration and License Agreement
Sales of Future Royalties [Line Items]
Non-cash revenue recognized	$ 1,600,000	$ 4,400,000
Interest rate	17.50%	17.50%
Non-cash interest expense recognized	$ 800,000	$ 1,900,000

Sales of Future Royalties - Debt of Future Royalties (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Sale of Future Royalty [Roll Forward]
Beginning balance of debt related to sale of future royalties	$ 189,483
Royalties owed to OMERS	834
Royalties paid to OMERS	(29,498)
Non-cash interest expense recognized	18,937
Ending balance of debt related to sale of future royalties	179,756
Debt - short-term	38,930
Debt - long-term	140,826
Total debt	$ 179,756