Form 10-Q - Quarterly report [Sections 13 or 15(d)]

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

______________________

FORM 10-Q

_____________________

(Mark One)


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

For the quarterly period ended March 31, 2024


¨			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: 001-39634

______________________

Foghorn Therapeutics Inc.

(Exact Name of Registrant as Specified in its Charter)

______________________


Delaware (State or other jurisdiction of incorporation or organization)			47-5271393 (I.R.S. Employer Identification No.)

500 Technology Square, Ste 700 Cambridge MA (Address of principal executive offices)			02139 (Zip Code)

Registrant’s telephone number, including area code: 617-586-3100

______________________

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, $0.0001 par value per share

FHTX

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 ¨

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 ¨

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


Large accelerated filer	¨	Accelerated filer	¨

Non-accelerated filer	x	Smaller reporting company	x

		Emerging growth company	x

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

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

As of April 30, 2024, the registrant had 42,585,616 shares of common stock, $0.0001 par value per share, outstanding.

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		Page
PART I.	FINANCIAL INFORMATION	1
Item 1.	Financial Statements (Unaudited)	1
	Condensed Consolidated Balance Sheets	1
	Condensed Consolidated Statements of Operations and Comprehensive Loss	2
	Condensed Consolidated Statements of Stockholders’ Equity (Deficit)	3
	Condensed Consolidated Statements of Cash Flows	4
	Notes to Unaudited Condensed Consolidated Financial Statements	5
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	12
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	19
Item 4.	Controls and Procedures	19
PART II.	OTHER INFORMATION	20
Item 1.	Legal Proceedings	20
Item 1A.	Risk Factors	20
Item 5.	Other Information	20
Item 6.	Exhibits	21
Signatures		22

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SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q contains forward-looking statements that are based on management’s beliefs and assumptions and on information currently available to management. All statements other than statements of historical facts contained in this Quarterly Report on Form 10-Q are forward-looking statements. In some cases, you can identify forward-looking statements by terms such as “may,” “will,” “should,” “expect,” “plan,” “anticipate,” “could,” “intend,” “target,” “project,” “contemplate,” “believe,” “estimate,” “predict,” “potential” or “continue” or the negative of these terms or other similar expressions, although not all forward-looking statements contain these words. Forward-looking statements include, but are not limited to, statements concerning:

•the initiation, timing, progress, enrollment, results, and timing of results and regulatory filings of our research and development programs and our preclinical and clinical studies, including potential combination trials involving FHD-286 and our collaboration with Loxo Oncology at Eli Lilly and Company (“Lilly”);

•our ability to advance any product candidates that we may develop and to successfully complete preclinical and clinical studies;

•our ability to leverage our initial programs to develop additional product candidates using our Gene Traffic Control® platform;

•developments related to our competitors and our industry;

•our ability to expand the target populations of our programs and the availability of patients for clinical testing;

•our ability to obtain regulatory approval for FHD-286 and any future product candidates from the U.S. Food and Drug Administration (the “FDA”) and other regulatory authorities;

•our ability to identify and enter into future license agreements and collaborations;

•our ability to continue to rely on our contract development and manufacturing organizations (“CDMOs”) or contract research organizations (“CROs”), including those located outside the United States, such as those located in China, for our manufacturing and research needs;

•regulatory developments in the United States and foreign countries;

•general economic conditions, including recessionary conditions, interest rates, monetary fluctuations and supply chain constraints;

•the impact of rising inflation and interest rates on our ability to raise additional capital;

•the expected trends in our expenses and capital requirements as they relate to our ongoing activities;

•geopolitical instability and armed conflict, including those in Ukraine, Gaza, and the Red Sea;

•our ability to attract and retain key scientific and management personnel; and

•the scope of protection we are able to establish, maintain and enforce for intellectual property rights covering FHD-286, our future products and our Gene Traffic Control platform.

The forward-looking statements in this Quarterly Report on Form 10-Q are only predictions and are based largely on our current expectations and projections about future events and financial trends that we believe may affect our business, financial condition and results of operations. These forward-looking statements speak only as of the date of this Quarterly Report on Form 10-Q and are subject to a number of known and unknown risks, uncertainties and assumptions, including those described under the section entitled “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023. Because forward-looking statements are inherently subject to risks and uncertainties, some of which cannot be predicted or quantified and some of which are beyond our control, you should not rely on these forward-looking statements as predictions of future events. Moreover, we operate in an evolving environment. New risks and uncertainties may emerge from time to time, and it is not possible for management to predict all risks and uncertainties. Except as required by applicable law, we do not plan to publicly update or revise any forward-looking statements contained herein, whether as a result of any new information, future events, changed circumstances or otherwise.

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PART I—FINANCIAL INFORMATION

Item 1. Financial Statements (unaudited)

Foghorn Therapeutics Inc.

Condensed Consolidated Balance Sheets

(In thousands, except share and per share amounts)

(Unaudited)


	March 31, 2024		December 31, 2023
Assets
Current assets:
Cash and cash equivalents	$	79,253	$	80,336
Marketable securities	127,408		153,721


Prepaid expenses and other current assets	4,859		6,124
Total current assets	211,520		240,181
Property and equipment, net	12,187		12,956
Restricted cash	1,708		1,708
Other assets	1,052		1,115
Operating lease right-of-use assets	28,537		29,956
Total assets	$	255,004	$	285,916
Liabilities and Stockholders’ Deficit
Current liabilities:
Accounts payable	$	5,631	$	6,260
Accrued expenses and other current liabilities	6,265		9,108
Operating lease liabilities	8,668		8,518
Deferred revenue	31,501		34,550
Total current liabilities	52,065		58,436
Operating lease liabilities, net of current portion	34,311		36,555
Deferred revenue, net of current portion	266,114		268,115

Total liabilities	352,490		363,106
Commitments and contingencies (Note 9)
Stockholders’ deficit:
Preferred stock, $0.0001 par value; 25,000,000 shares authorized at March 31, 2024 and December 31, 2023; no shares issued and outstanding at March 31, 2024 and December 31, 2023	—		—
Common stock, $0.0001 par value; 175,000,000 shares authorized at March 31, 2024 and December 31, 2023; 42,585,616 shares issued and outstanding at March 31, 2024 and 42,282,040 shares issued and outstanding at December 31, 2023	4		4
Additional paid-in capital	399,587		395,196
Accumulated other comprehensive loss	(497)		(826)
Accumulated deficit	(496,580)		(471,564)
Total stockholders’ deficit	$	(97,486)	$	(77,190)
Total liabilities and stockholders’ deficit	$	255,004	$	285,916

The accompanying notes are an integral part of these condensed consolidated financial statements.

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Foghorn Therapeutics Inc.

Condensed Consolidated Statements of Operations and Comprehensive Loss

(In thousands, except share and per share amounts)

(Unaudited)


	Three Months Ended March 31,
	2024		2023
Collaboration revenue	$	5,050	$	5,309
Operating expenses:
Research and development	25,534		29,985
General and administrative	7,710		8,641
Total operating expenses	33,244		38,626
Loss from operations	(28,194)		(33,317)
Other income, net:
Interest income	2,439		2,669
Other income, net	739		720
Total other income, net	3,178		3,389
Loss before income taxes	(25,016)		(29,928)
Provision for income taxes	—		(560)
Net loss	$	(25,016)	$	(30,488)
Net loss per share attributable to common stockholders—basic and diluted	$	(0.59)	$	(0.73)
Weighted average common shares outstanding—basic and diluted	42,428,813		41,811,087
Comprehensive loss:
Net loss	$	(25,016)	$	(30,488)
Other comprehensive gain:
Unrealized gains on marketable securities	329		1,116
Total other comprehensive gain	329		1,116
Total comprehensive loss	$	(24,687)	$	(29,372)

The accompanying notes are an integral part of these condensed consolidated financial statements.

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Foghorn Therapeutics Inc.

Condensed Consolidated Statements of Stockholders’ Equity (Deficit)

(In thousands, except share amounts)

(Unaudited)


	Common Stock			Additional Paid-in Capital		Accumulated Other Comprehensive Loss		Accumulated Deficit		Total Stockholders’ Deficit
	Shares	Amount
Balances at December 31, 2023	42,282,040	$	4	$	395,196	$	(826)	$	(471,564)	$	(77,190)










Issuance of common stock upon exercise of stock options and employee stock purchase plan	303,576	—		1,167		—		—		1,167
Stock-based compensation expense	—	—		3,224		—		—		3,224
Unrealized gains on marketable securities	—	—		—		329		—		329
Net loss	—	—		—		—		(25,016)		(25,016)
Balances at March 31, 2024	42,585,616	$	4	$	399,587	$	(497)	$	(496,580)	$	(97,486)


	Common Stock			Additional Paid-in Capital		Accumulated Other Comprehensive Gain (Loss)		Accumulated Deficit		Total Stockholders’ Equity (Deficit)
	Shares	Amount
Balances at December 31, 2022	41,803,436	$	4	$	377,232	$	(3,986)	$	(373,138)	$	112










Issuance of common stock upon exercise of stock options and employee stock purchase plan	21,322	—		102		—		—		102
Stock-based compensation expense	—	—		4,572		—		—		4,572
Unrealized gains on marketable securities	—	—		—		1,116		—		1,116
Net loss	—	—		—		—		(30,488)		(30,488)
Balances at March 31, 2023	41,824,758	$	4	$	381,906	$	(2,870)	$	(403,626)	$	(24,586)

The accompanying notes are an integral part of these condensed consolidated financial statements.

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Foghorn Therapeutics Inc.

Condensed Consolidated Statements of Cash Flows

(In thousands)

(Unaudited)


	Three Months Ended March 31,
	2024		2023
Cash flows from operating activities:
Net loss	$	(25,016)	$	(30,488)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	3,224		4,572
Depreciation and amortization expense	835		859

Noncash lease expense	1,419		1,200

Accretion of discount on marketable securities	(554)		(770)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	1,328		887

Accounts payable	(629)		1,691
Accrued expenses and other liabilities	(2,808)		(2,154)
Operating lease liabilities	(2,094)		(1,668)
Deferred revenue	(5,050)		(5,309)
Net cash used in operating activities	(29,345)		(31,180)
Cash flows from investing activities:
Purchases of property and equipment	(101)		(636)

Purchases of marketable securities	(31,263)		(26,232)
Proceeds from maturities of marketable securities	58,459		56,373
Net cash provided by investing activities	27,095		29,505
Cash flows from financing activities:
Proceeds from issuance of common stock upon exercise of stock options and employee stock purchase plan	1,167		102

Net cash provided by financing activities	1,167		102
Net decrease in cash, cash equivalents and restricted cash	(1,083)		(1,573)
Cash, cash equivalents and restricted cash at beginning of period	82,044		53,922
Cash, cash equivalents and restricted cash at end of period	$	80,961	$	52,349


Supplemental disclosure of noncash investing and financing information:
Cash paid for taxes	$	49	$	—
Purchases of property and equipment included in accounts payable and accrued expenses	$	—	$	298
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	$	79,253	$	50,641
Restricted cash (current and non-current)	1,708		1,708
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$	80,961	$	52,349

The accompanying notes are an integral part of these condensed consolidated financial statements.

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Foghorn Therapeutics Inc.

Notes to Condensed Consolidated Financial Statements

(Unaudited)

1. Nature of Business, Going Concern and Basis of Presentation

Foghorn Therapeutics Inc. (the “Company”) is a clinical-stage biopharmaceutical company discovering and developing a new class of medicines targeting genetically determined dependencies within the chromatin regulatory system. The Company uses its proprietary Gene Traffic Control platform to identify, validate and potentially drug targets within the system. The Company was founded in October 2015 as a Delaware corporation. The Company is headquartered in Cambridge, Massachusetts.

The Company is subject to risks similar to those of other early-stage companies in the biopharmaceutical industry, including dependence on key individuals, the need to develop commercially viable products, competition from other companies, many of whom are larger and better capitalized, and the need to obtain adequate additional financing to fund the development of its products. There can be no assurance that the Company’s research and development will be successfully completed, that adequate protection for the Company’s intellectual property will be maintained, that any products developed will obtain required regulatory approval or that any approved products will be commercially viable. Even if the Company’s development efforts are successful, it is uncertain when, if ever, the Company will generate significant revenue from the sale of its products.

Going concern

The accompanying condensed consolidated financial statements have been prepared on the basis of continuity of operations, realization of assets and the satisfaction of liabilities and commitments in the ordinary course of business. Since inception, the Company has funded its operations primarily with proceeds from sales of preferred stock, upfront and milestone payments from collaboration agreements, a public offering and a stock purchase agreement. The Company has incurred recurring losses, including net losses of $25.0 million and $30.5 million for the three months ended March 31, 2024 and 2023, respectively. As of March 31, 2024, the Company had an accumulated deficit of $496.6 million. The Company expects to continue to generate operating losses in the foreseeable future. As of the issuance date of these interim condensed consolidated financial statements the Company expects that its cash, cash equivalents and marketable securities will be sufficient to fund its operating expenses and capital expenditure requirements for at least 12 months.

The Company will need to obtain additional funding through public or private equity offerings, debt financings, collaborations, strategic alliances and/or licensing arrangements to continue to fund its operations. The Company may not be able to obtain financing on acceptable terms, or at all, and the Company may not be able to enter into collaborative or strategic alliances or licensing arrangements. The terms of any financing may adversely affect the holdings or the rights of the Company’s stockholders. Arrangements with collaborators or others may require the Company to relinquish rights to certain of its technologies or programs. If the Company is unable to obtain funding, the Company could be forced to delay, reduce or eliminate some or all of its research and development programs, pipeline expansion or commercialization efforts, which could adversely affect its business prospects. Although management will continue to pursue these plans, there is no assurance that the Company will be successful in obtaining sufficient funding in the future on terms acceptable to the Company to fund continuing operations when needed or at all.

Basis of presentation

The Company’s condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and pursuant to the rules and regulations of the United States Securities and Exchange Commission for interim financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. The accompanying condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary. All intercompany accounts and transactions have been eliminated in consolidation. Any reference in these notes to applicable guidance is meant to refer to the authoritative GAAP as found in the Accounting Standards Codification (“ASC”) and Accounting Standards Update (“ASU”) of the Financial Accounting Standards Board (“FASB”).

2. Summary of Significant Accounting Policies

The accounting policies of the Company are set forth in Note 2 to the consolidated financial statements contained in the Company’s 2023 Annual Report on Form 10-K, and the accounting policies followed by the Company for interim financial reporting are consistent with the accounting policies therein.

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3. Marketable Securities and Fair Value Measurements

As of March 31, 2024, available for sale marketable securities by security type consisted of (in thousands):


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
U.S. treasury notes (due within one year)	$	7,468	$	—	$	(1)	$	7,467
U.S. government agencies (due within one year)	7,833		—		(13)		7,820
Commercial paper (due within one year)	6,972		2		(15)		6,959
Corporate notes and bonds (due within one year)	92,063		3		(416)		91,650

Corporate notes and bonds (due after one year through two years)	13,569		—		(57)		13,512
Total	$	127,905	$	5	$	(502)	$	127,408

As of December 31, 2023, available for sale marketable securities by security type consisted of (in thousands):


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value

U.S. government agencies (due within one year)	11,823		—		(26)		11,797
Commercial paper (due within one year)	5,901		7		(2)		5,906
Corporate notes and bonds (due within one year)	130,933		11		(784)		130,160
Corporate notes and bonds (due after one year through two years)	5,890		—		(32)		5,858
Total	$	154,547	$	18	$	(844)	$	153,721

The following tables present the Company’s fair value hierarchy for its assets and liabilities, which are measured at fair value on a recurring basis (in thousands):


	Fair Value Measurements at March 31, 2024 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	62,312	$	—	$	—	$	62,312
U.S. treasury notes	—		16,941		—		16,941

Marketable securities:
U.S. treasury notes	—		7,467		—		7,467
U.S. government agencies	—		7,820		—		7,820
Commercial paper	—		6,959		—		6,959
Corporate notes and bonds	—		105,162		—		105,162
Total	$	62,312	$	144,349	$	—	$	206,661
	Fair Value Measurements at December 31, 2023 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	53,336	$	—	$	—	$	53,336
U.S. treasury notes	—		27,000		—		27,000

Marketable securities:

U.S. government agencies	—		11,797		—		11,797
Commercial paper	—		5,906		—		5,906
Corporate notes and bonds	—		136,018		—		136,018
Total	$	53,336	$	180,721	$	—	$	234,057

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For the three months ended March 31, 2024 and 2023, there were no transfers between Level 1, Level 2 and Level 3.

4. Property and Equipment, Net

Property and equipment, net consisted of the following (in thousands):


	March 31, 2024		December 31, 2023
Laboratory equipment	$	6,869	$	6,804
Furniture and fixtures	815		815
Computer equipment and software	74		115
Leasehold improvements	17,239		17,239

	24,997		24,973
Less: Accumulated depreciation and amortization	(12,810)		(12,017)
	$	12,187	$	12,956

Depreciation and amortization expense was $0.8 million and $0.9 million for the three months ended March 31, 2024 and 2023, respectively.

5. Accrued Expenses and Other Current Liabilities

Accrued expenses consisted of the following (in thousands):


	March 31, 2024		December 31, 2023
Accrued external research and development expenses	$	3,355	$	3,646
Accrued employee compensation and benefits	1,619		4,347
Accrued income taxes	674		674
Accrued professional fees	617		441


	$	6,265	$	9,108

6. Common Stock and Net Loss Per Share

Common Stock

Each share of common stock entitles the holder to one vote on all matters submitted to a vote of the Company’s stockholders. Common stockholders are not entitled to receive dividends, unless declared by the board of directors.

Net Loss Per Share

The following common stock equivalents presented based on amounts outstanding at each period end have been excluded from the calculation of diluted net loss per share because including them would have had an anti-dilutive impact:


	March 31,
	2024	2023
Stock options to purchase common stock	9,597,719	9,666,311
Warrants to purchase common stock	18,445	18,445
	9,616,164	9,684,756

7. Stock-Based Compensation

2020 Equity Incentive Plan

The Company’s 2020 Equity Incentive Plan (the “2020 Plan”) provides for the grant of incentive stock options, non-qualified options, stock appreciation rights, restricted stock awards, restricted stock units and other stock-based awards. The number of shares initially reserved for issuance under the 2020 Plan was (i) 2,200,000 shares (the “share pool”), plus (ii) the number of shares of common stock available for issuance under the Company’s 2016 Stock Incentive Plan (the “2016 Plan”) as of the effective date of the 2020 Plan, plus the number of shares of common stock underlying awards under the 2016 Plan that on or

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after the date of adoption expire or become unexercisable without delivery of shares, are forfeited to, or repurchased for cash, are settled in cash, or otherwise become available again for grant under the 2016 Plan, in each case, in accordance with its terms (up to an aggregate of 5,078,295 shares). As of March 31, 2024, 2,391,808 shares remained available for future grant under the 2020 Plan.

The share pool will automatically increase on January 1 of each year from 2021 to 2030 by the lesser of (i) four percent of the number of shares of our common stock outstanding as of the close of business on the immediately preceding December 31 and (ii) the number of shares determined by the board of directors on or prior to such date for such year. The number of shares reserved for issuance under the 2020 Plan was increased by 1,691,281 shares effective January 1, 2024.

The 2020 Plan is administered by the board of directors or, at the discretion of the board of directors, by a committee of the board of directors. The exercise prices, vesting and other restrictions are determined at the discretion of the board of directors, or its committee if so delegated. Stock options granted with service-based vesting conditions generally vest over four years and expire after ten years. The exercise price for stock options granted is not less than the fair value of common stock on the date of grant. The Company bases fair value of common stock on the quoted market price.

2020 Employee Stock Purchase Plan

On October 21, 2020, the Company’s board of directors adopted and its stockholders approved the 2020 Employee Stock Purchase Plan (the “ESPP”), which became effective on October 21, 2020. The aggregate number of shares of common stock available for purchase pursuant to the exercise of options under the ESPP is 360,000 shares, plus an automatic annual increase, as of January 1 of each year from 2021 to 2030, equal to the lesser of one percent of the number of shares of common stock outstanding as of the close of business on the immediately preceding December 31 and (ii) the number of shares determined by the board of directors on or prior to such date for such year (up to a maximum of 3,220,520 shares). The number of shares reserved for issuance under the ESPP was increased by 422,820 shares to 1,566,120 shares effective January 1, 2024. As of March 31, 2024, 1,554,086 shares remained available for future grant under the ESPP.

Eligible employees may authorize payroll deductions of up to 15% of their eligible compensation during an offering period. The purchase of shares is done at a 15% discount on the lesser of (i) the Fair Market Value of a share of Stock on the first day of the offering period and (ii) the Fair Market Value of a share of Stock on the last day of the offering period. The Company currently holds two offering periods, September 1 and March 1, respectively. The Company recognized a de minimis amount of expense related to the ESPP for the three months ended March 31, 2024 and 2023, respectively.

Stock-Based Compensation

Stock-based compensation expense was classified in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):


	Three Months Ended March 31,
	2024		2023
Research and development expenses	$	1,341	$	2,039
General and administrative expenses	1,883		2,533
	$	3,224	$	4,572

As of March 31, 2024, total unrecognized compensation cost related to unvested options was $23.3 million, which is expected to be recognized over a weighted average period of 2.3 years.

8. Collaboration Agreements

Lilly Collaboration Agreement and Stock Purchase Agreement

In December 2021, the Company entered into a collaboration agreement (the “Lilly Collaboration Agreement”) with Loxo Oncology at Eli Lilly and Company (“Lilly”) to create novel oncology medicines by applying Foghorn’s proprietary Gene Traffic Control platform. The collaboration includes a co-development and co-commercialization agreement for the Company’s selective BRM oncology target, consisting of two programs, and one additional undisclosed oncology target (collectively, the “Joint Programs”). The collaboration also includes three additional discovery targets or programs (collectively, the “Discovery Programs”) for a total of six programs directed at five targets.

With respect to the Joint Programs, the Company will lead discovery and early research activities through the successful completion of dose finding toxicity studies for the identified compound, while Lilly will lead development and commercialization activities of the identified compound with participation from the Company in development activities and 50% cost sharing until registrational clinical trials. The Company and Lilly may jointly develop and commercialize the Joint

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Program compound though the Company may, in its sole discretion, opt-out on a program-by-program basis of further participation in the development and commercialization efforts prior to the first registrational clinical trial. If the Company does not opt-out, Lilly and the Company will continue to share in the costs to further develop and commercialize the Joint Program compound on a worldwide basis, equally share in the U.S. profits on product sales, subject to certain adjustments and receive royalties on sales outside of the United States (“Ex-U.S.”) at royalty rates ranging from low double digits to high twenties. If the Company opts-out of further development and commercialization efforts, it will have no further obligations to share in the development and commercialization costs, will receive royalties rather than profit share on U.S. sales and will receive royalties at a lower rate on Ex-U.S. sales.

With respect to the Discovery Programs, the Company will lead discovery and early research activities through the successful completion of dose finding toxicity studies for the identified compounds. The Company may, in its sole discretion, opt-in on a program-by-program basis after the successful completion of dose finding toxicity to participate in the further development and commercialization efforts of the Discovery Program compounds. If the Company opts-in to the development and commercialization of the Discovery Program compounds, it will be eligible to receive milestone payments of up to $10.0 million per program upon specified research and development milestones and up to $180.0 million per program upon achievement of specified regulatory and commercial milestones and will also be eligible to share in the U.S. profits at pre-determined percentages on product sales. The Company would also be eligible to receive tiered Ex-U.S. royalty rates, calculated on a product-by-product and country-by-country basis, on net sales outside of the United States, if any, ranging from low single digits to low double digits, but less then teens. If the Company does not opt-in to further development and commercialization efforts for the Discovery Programs, it will be eligible to receive milestone payments of up to $70.0 million per program upon specified research and development milestones and up to $360.0 million per program upon achievement of specified regulatory and commercial milestones per approved product, if any. The Company would also be eligible to receive tiered royalties on net sales of products worldwide at royalty rates ranging from low single digits to low double digits, but less than teens.

Lilly has the right to make substitutions for each of the five targets during the research term of each program, subject to certain limitations. Pursuant to the Lilly Collaboration Agreement, the Company will also participate in joint decision-making through the joint steering committee and subcommittees. Unless terminated earlier, the Lilly Collaboration Agreement will continue on a product-by-product basis until the expiration of all royalty obligations under the Lilly Collaboration Agreement and when neither the Company nor Lilly is developing, commercializing or manufacturing any product under the Lilly Collaboration Agreement. The Company or Lilly may terminate the Lilly Collaboration Agreement upon an uncured material breach by the other party. Lilly may also terminate the Lilly Collaboration Agreement in its entirety or on a target-by-target, program-by-program or product-by-product basis for any reason upon certain notice to the Company.

The Company determined that (1) the research activities performed by the Company for both the Joint Programs and the Discovery Programs (2) the development activities and cost sharing for the Joint Program development efforts after dose finding toxicity until registrational clinical trials (3) the research, development, manufacture and commercialization licenses and (4) service on the joint steering committee and subcommittees represent a single performance obligation under the Lilly Collaboration Agreement. The Company determined that Lilly cannot benefit from the licenses separately from the research activities, the development activities until registrational clinical trials and participation on the joint steering committee and subcommittees because these services are specialized and rely on the Company’s expertise such that these activities are highly interrelated and therefore not distinct. Accordingly, the promised goods and services represent one combined performance obligation, and the entire transaction price was allocated to that single combined performance obligation. The performance obligation will be satisfied over time as the Company performs the research activities, participates and shares in the cost of the development activities for the Joint Programs and participates in a joint steering committee and subcommittees to oversee these activities.

The Company’s options to share in further development and commercialization efforts via its opt-in/opt-out rights will be assessed and accounted for as separate units of accounting under the relevant guidance if, and when, such options are exercised by the Company.

During the third quarter of 2023, the Company has transitioned the BRM Selective inhibitor program into development activities for which Lilly will lead and the Company will participate and share in 50% of the costs until at least registrational trials. Costs incurred will continue to be included in research and development expenses on the condensed consolidated statements of operations and comprehensive loss.

As of March 31, 2024, the aggregate amount of the transaction price related to the unsatisfied portion of the performance obligation was $297.6 million, which is expected to be recognized as revenue through 2029 or beyond depending on the timing of certain clinical development activities. The Company does not expect collaboration revenue to be recognized evenly over this period as it will be recognized on a percentage of completion basis (using a cost-to-cost method) as the Company performs the research and development activities and participates on the joint steering committee and subcommittees, which will likely vary from period to period. In estimating the total costs to satisfy its single performance obligation pursuant to the Lilly

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Collaboration Agreement, the Company is required to make significant estimates including an estimate of the number of target substitutions Lilly may elect to make and the expected time and expected costs to fulfill the performance obligation. The cumulative effect of revisions to the total estimated costs to complete the Company’s single performance obligation will be recorded in the period in which the changes are identified, and amounts can be reasonably estimated. While such revisions will have no impact on the Company’s cash flows, a significant change in these assumptions and estimates could have a material impact on the timing and amount of revenue recognized in future periods and the classification of deferred revenue between short-term and long-term.

For the three months ended March 31, 2024 and 2023, the Company had recorded $5.1 million and $4.7 million, respectively, of revenue under the Lilly Collaboration Agreement, which was included in deferred revenue at the beginning of the respective periods. As of March 31, 2024 and December 31, 2023, the Company had a payable to Lilly of $1.2 million and $1.5 million recorded in accrued expenses and other current liabilities on the Company’s consolidated balance sheets.

Merck Collaboration Agreement

In July 2020, the Company entered into the Merck Collaboration Agreement with Merck, pursuant to which the Company and Merck applied Foghorn’s proprietary Gene Traffic Control platform to discover and develop novel therapeutics. Under the terms of the Merck Collaboration Agreement, the Company and Merck were each responsible to perform certain research activities in accordance with a mutually-agreed upon research plan.

For the three months ended March 31, 2023, the Company had recorded $0.6 million of the revenue under the Merck Collaboration Agreement, which was included in deferred revenue at the beginning of the respective periods and the classification of deferred revenue between short term and long term.

On August 9, 2023 the Company received notice from Merck that it is terminating the Merck Collaboration Agreement effective November 7, 2023 and, accordingly, all remaining deferred revenue was recognized at that time. As of December 31, 2023, there was no remaining performance obligation, and no corresponding deferred revenue remaining, under the Merck Collaboration Agreement.

9. Commitments and Contingencies

Leases

The Company leases office space under a non-cancelable operating lease. There have been no material changes to the Company's lease during the three months ended March 31, 2024. For additional information, see Note 10, Leases, to the consolidated financial statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2023.

License agreements

The Company has entered into various exclusive and non-exclusive license agreements for certain technologies. Under the terms of these license agreements, the Company could be required to reimburse the licensors for patent expenses and remit amounts in the low single-digit as sales-based royalties upon the occurrence of specific events as outlined in the corresponding license agreements. The Company is also required to make annual license maintenance fees of less than $0.3 million and pay up to $1.1 million in regulatory milestones on each licensed product upon the occurrence of specific events as outlined in one of the license agreements. None of our product candidates utilize technologies covered by these licenses.

Indemnification agreements

In the ordinary course of business, the Company may provide indemnification of varying scope and terms to vendors, lessors, contract research organizations, business partners and other parties with respect to certain matters including, but not limited to, losses arising out of breach of such agreements or from intellectual property infringement claims made by third parties. In addition, the Company has entered into indemnification agreements with members of its board of directors and its executive officers that will require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors or officers. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is, in many cases, unlimited. The Company has not incurred any material costs as a result of such indemnifications and is not currently aware of any indemnification claims.

Legal Proceedings

From time to time, the Company may become involved in litigation or other legal proceedings. The Company is not currently a party to any material litigation or legal proceedings.

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10. Related Parties

In October 2015, the Company entered into a five-year consulting agreement with a scientific founder of the Company who is also a shareholder. This agreement was amended and extended to January 1, 2025 and is subject to automatic one-year renewal terms until terminated if notice is provided more than 30 days before the current end of term date. During the three months ended March 31, 2024 and 2023, the Company paid the scientific founder a de minimis amount. As of March 31, 2024 and December 31, 2023, the Company had less than $0.1 million, respectively, of accounts payable due to the scientific founder.

On December 10, 2021, we entered into the Lilly Collaboration Agreement with Lilly. Concurrent with the Lilly Collaboration Agreement the Company also entered into a stock purchase agreement with Lilly (the “Lilly SPA”) where the Company issued and sold Lilly 4,000,000 shares of our common stock at a price of $20.00 per share, making them a 5% or greater shareholder in the Company for the three months ended March 31, 2024 and 2023. We are obligated to make certain payments to Lilly pursuant to the Lilly Collaboration Agreement. During the three months ended March 31, 2024, the Company paid Lilly $1.7 million. The Company made no payments to Lilly during the three months ended March 31, 2023. As of March 31, 2024 and December 31, 2023, the Company had a payable of $1.2 million and $1.5 million, respectively, due to Lilly.

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

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with our condensed consolidated financial statements and the related notes to those statements included elsewhere in this Quarterly Report on Form 10-Q. In addition to historical financial information, the following discussion and analysis contains forward-looking statements that involve risks, uncertainties and assumptions. Some of the numbers included herein have been rounded for the convenience of presentation. Our actual results may differ materially from those anticipated in these forward-looking statements as a result of many factors, including those discussed under “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023 and in this Quarterly Report on Form 10-Q.

Overview

Foghorn is a clinical stage, precision therapeutics biotechnology company pioneering a new class of medicines that treat serious diseases by correcting abnormal gene expression through selectively targeting the chromatin regulatory system, an untapped opportunity for therapeutic intervention in oncology and with potential in a wide spectrum of other diseases including virology, autoimmune diseases and neurology.

The chromatin regulatory system orchestrates gene expression—the turning on and off of genes—which is fundamental to how all our cells function. The chromatin regulatory system is implicated in approximately 50 percent of all cancers, and understanding how this system works could lead to an entirely new class of precision medicines. To our knowledge, we are the only company with the ability to study and target the chromatin regulatory system at scale, in context, and in an integrated way.

Our proprietary Gene Traffic Control platform provides an integrated and mechanistic understanding of how the various components of the chromatin regulatory system interact, allowing us to identify, validate and potentially drug targets within this system. We have developed unique capabilities that have yielded new insights and scalability in drugging this new, previously untapped and promising area.

At present, we are working on more than eight programs with one clinical-stage drug candidate currently in Phase 1 development and one drug candidate with an Investigational New Drug Application (“IND”) submitted in April 2024 and anticipated to enter clinical development later this year. We have discovered highly selective chemical matter for some of the most challenging targets in oncology including BRM, CBP, EP300 and ARID1B as well as other undisclosed targets. We believe our current pipeline has the potential to help more than 500,000 cancer patients. We take a small molecule modality agnostic approach to drugging targets which includes protein degraders, allosteric enzymatic inhibitors, and transcription factor disruptors. We are a biology first company which means we focus first on the underlying genetics and biology of a disease relevant target and then leverage the most appropriate drugging approach to impact the disease biology.

We are currently conducting a Phase 1 dose escalation study of FHD-286, a selective, allosteric ATPase inhibitor of BRM and BRG1, in combination with either decitabine or cytarabine in relapsed and/or refractory acute myeloid leukemia patients. As part of our collaboration with Loxo Oncology at Eli Lilly and Company (“Lilly”), we anticipate that a Phase 1 dose escalation study will start later this year with FHD-909, a selective ATPase inhibitor of BRM.

During the third quarter of 2023, we transitioned the BRM Selective inhibitor program to Lilly which triggered the 50/50 cost share for the BRM programs. Costs related to the cost-share are included in research and development expenses on the condensed consolidated statements of operations and comprehensive loss.

Since our inception, we have focused substantially all of our resources on building our Gene Traffic Control platform, organizing and staffing our company, business planning, raising capital, conducting discovery and research activities, protecting our trade secrets, filing patent applications, identifying potential product candidates, undertaking preclinical studies and clinical trial activities, establishing arrangements with third parties for the manufacture of initial quantities of our product candidates and component materials and initiating two strategic collaborations. We do not have any products approved for sale and have not generated any revenue from product sales.

On December 10, 2021, we entered into a collaboration agreement (the “Lilly Collaboration Agreement”) with Lilly, for which we received an upfront payment of $300.0 million in January 2022 (see Note 8 to our notes to unaudited condensed consolidated financial statements included elsewhere in this Quarterly Report on Form 10-Q). Concurrent with the Lilly Collaboration Agreement, we also entered into a stock purchase agreement (the “Lilly SPA”) with Lilly whereby we issued and sold Lilly 4,000,000 shares of our common stock at a price of $20.00 per share, resulting in net proceeds of $80.0 million, of which $42.2 million was allocated to equity upon the issuance of our common stock.

We have incurred significant operating losses since our inception. For the three months ended March 31, 2024 and the year ended December 31, 2023, we reported net losses of $25.0 million and $98.4 million, respectively. As of March 31, 2024, we had an accumulated deficit of $496.6 million. We expect to continue to incur significant expenses and increasing operating losses for at least the next several years. Our ability to generate any product revenue or product revenue sufficient to achieve

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profitability will depend on the successful development and eventual commercialization of one or more product candidates we are developing or may develop.

We expect that our expenses and capital requirements will increase substantially in connection with our ongoing activities, particularly if and as we:

• advance FHD-286 and continue preclinical and clinical development of product candidates from our current portfolio, including those partnered with Lilly;

• identify and advance additional research programs and additional product candidates;

• initiate preclinical testing for any new product candidates we identify and develop;

• obtain, maintain, expand, enforce, defend and protect our trade secrets and intellectual property portfolio and provide reimbursement of third-party expenses related to our patent portfolio;

• hire additional research and development personnel;

• add operational, legal, compliance, financial and management information systems and personnel to support our research, product development and operations;

• expand the capabilities of our platform;

• acquire or in-license product candidates, intellectual property and technologies;

• operate as a public company;

• seek marketing approvals for any product candidates that successfully complete clinical trials; and

• ultimately establish a sales, marketing and distribution infrastructure to commercialize any products for which we may obtain marketing approval.

We will not generate revenue from product sales unless and until we successfully commercialize one of our product candidates, after completing clinical development and obtaining regulatory approval. If we obtain regulatory approval for any of our product candidates, we expect to incur significant expenses related to developing our commercialization capability to support product sales, marketing, manufacturing and distribution. Further, we expect to incur additional costs associated with operating as a public company.

As a result, we will need substantial additional funding to support our continuing operations and pursue our growth strategy. Until we can generate significant revenue from product sales, if ever, we expect to finance our operations through a combination of equity offerings, debt financings and collaborations or licensing arrangements and the Lilly Collaboration Agreement. We may be unable to raise additional funds or enter into such other agreements or arrangements when needed on favorable terms, or at all. If we fail to raise capital or enter into such agreements as, and when, needed, we may have to significantly delay, scale back our development or commercialization plans for one or more of our product candidates.

Because of the numerous risks and uncertainties associated with pharmaceutical product development, we are unable to accurately predict the timing or amount of increased expenses or when, or if, we will be able to achieve or maintain profitability. Even if we are able to generate product sales, we may not become profitable. If we fail to become profitable or are unable to sustain profitability on a continuing basis, then we may be unable to continue our operations at planned levels and be forced to reduce or terminate our operations.

Components of Our Results of Operations

Collaboration Revenue

To date, we have not generated any revenue from product sales and do not expect to do so in the near future. If our development efforts for our product candidates are successful and result in regulatory approval or licenses with third parties, we may generate revenue in the future from product sales, milestone payments under our existing collaboration agreements or payments from other license agreements that we may enter into with third parties.

In December of 2021, we entered into a strategic collaboration with Lilly to create novel oncology medicines by applying Foghorn’s proprietary Gene Traffic Control platform. The collaboration includes a co-development and co-commercialization agreement for the aforementioned selective BRM oncology program and an additional undisclosed oncology target. In addition, the collaboration includes three additional discovery programs using Foghorn’s proprietary Gene Traffic Control platform. Under the terms of the collaboration, Foghorn received upfront consideration of $300.0 million in cash pursuant to the Lilly Collaboration Agreement, together with an equity investment by Lilly of $80.0 million in shares of Foghorn common stock pursuant to the Lilly SPA.

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For the BRM-selective program and the additional undisclosed target program, Foghorn will lead discovery and early research activities, while Lilly will lead development and commercialization activities with participation from Foghorn in operational activities and cost sharing. Foghorn and Lilly will share 50/50 in the U.S. economics, and Foghorn is eligible to receive royalties on ex-U.S. sales starting in the low double-digit range and escalating into the twenties based on revenue levels.

For the additional discovery programs, Foghorn will lead discovery and early research activities. Foghorn may receive up to a total of $1.3 billion in potential development and commercialization milestones. Additionally, Foghorn will have an option to participate in a percentage of the U.S. economics and is eligible to receive tiered royalties from the mid-single digit to low-double digit range on sales outside the U.S. that may be exercised after the successful completion of the dose-finding toxicity studies.

We cannot provide assurances as to the timing of future milestones, royalty payments and economics associated with the strategic collaboration with Lilly, if any.

In the third quarter of 2023, we transitioned the BRM Selective inhibitor program to Lilly, for which Lilly will lead and we will participate and share in 50% of the costs until registrational trials. Costs incurred will continue to be included in research and development expenses on the condensed consolidated statements of operations and comprehensive loss.

We recognized total deferred revenue of $337.8 million related to the Lilly Collaboration Agreement and the Lilly SPA, which included the $300.0 million upfront payment under the Lilly Collaboration Agreement as well as $37.8 million allocated to deferred revenue from the gross proceeds of the Lilly SPA to be recognized over the performance period. For the three months ended March 31, 2024 and 2023, we recognized $5.1 million and $4.7 million, respectively, of revenue under the Lilly Collaboration Agreement and, as of March 31, 2024, we had $297.6 million of deferred revenue related to the above mentioned upfront payment and revenue allocation remaining on our condensed consolidated balance sheets.

In July 2020, we entered into a Research Collaboration and Exclusive License Agreement (the “Merck Collaboration Agreement”) with Merck Sharp & Dohme Corp. (“Merck”), pursuant to which we agreed to apply our proprietary Gene Traffic Control platform to discover and develop novel therapeutics. On August 9, 2023 we received notice from Merck that it was terminating the Merck Collaboration Agreement effective November 7, 2023. At the time of termination, no material obligations remained under the Merck Collaboration Agreement.

For the three months ended March 31, 2024 and 2023, we recognized none and $0.6 million, respectively, of revenue under the Merck Collaboration Agreement. As of March 31, 2024, we had no deferred revenue, and no corresponding deferred revenue remaining, related to the upfront payment and milestone achievement remaining on our condensed consolidated balance sheets.

Operating Expenses

Our operating expenses are comprised of research and development expenses and general and administrative expenses.

Research and Development Expenses

Research and development expenses consist primarily of costs incurred to progress our proprietary and partnered pipeline, including our discovery efforts, which include:

•personnel-related costs, including salaries, benefits and stock-based compensation expense, for employees engaged in research and development functions;

•expenses incurred in connection with our research programs and preclinical and clinical development of our product candidates, including under agreements with third parties, such as consultants and contractors and contract research organizations (“CROs”);

•the cost of manufacturing drug substance and drug product for use in our research and preclinical studies and clinical trials under agreements with third parties, such as consultants and contractors and contract development and manufacturing organizations (“CDMOs”);

•laboratory supplies and research materials;

•facilities, depreciation and amortization and other expenses, which include direct and allocated expenses for rent and maintenance of facilities and insurance; and

•payments made under third-party licensing agreements.

We track our direct external research and development expenses on a program-by-program basis. These consist of costs that include fees, reimbursed materials, and other costs paid to consultants, contractors, CDMOs, and CROs in connection with our preclinical, clinical and manufacturing activities. We do not allocate employee costs, costs associated with our discovery efforts, laboratory supplies, and facilities expenses, including depreciation or other indirect costs, to specific product

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development programs because these costs are deployed across multiple programs and our platform and, as such, are not separately classified.

We expect that our research and development expenses may increase in the future as we advance our programs into clinical development and continue our discovery, research and preclinical activities in the near term and in the future. At this time, we cannot accurately estimate or know the nature, timing and costs of the efforts that will be necessary to complete the preclinical and clinical development of any product candidates we may develop. A change in the outcome of any number of variables with respect to product candidates we may develop could significantly change the costs and timing associated with the development of that product candidate. We may never succeed in obtaining regulatory approval for any product candidates we may develop.

General and Administrative Expenses

General and administrative expenses consist primarily of personnel-related costs, including salaries, benefits and stock-based compensation, for employees engaged in executive, legal, finance and accounting and other administrative functions. General and administrative expenses also include professional fees for legal, patent, consulting, investor and public relations, human resources, and accounting and audit services as well as direct and allocated facility-related costs.

We anticipate that our general and administrative expenses may increase in the future as we continue to support our continued research activities and development of our programs and platform. We also anticipate that we will continue to incur increased accounting, audit, legal, regulatory, compliance, director and officer insurance costs and investor and public relations expenses associated with operating as a public company.

Other Income, Net

Interest Income

Interest income consists of interest earned on our invested cash balances.

Other Income, Net

Other income, net consists of sublease income and miscellaneous expense unrelated to our core operations.

Income Taxes

As of December 31, 2023, we had federal net operating loss carryforwards of $3.0 million, which may be available to offset future taxable income. The federal net operating loss can be carried forward indefinitely but, in some circumstances, may be limited to offset 80% of annual taxable income. As of December 31, 2023, we also had federal and state research and development tax credit carryforwards of $3.7 million and $2.6 million, respectively, which may be available to reduce future tax liabilities and expire at various dates beginning in 2041 and 2037, respectively. Due to our history of cumulative net losses since inception and uncertainties surrounding our ability to generate future taxable income, we have recorded a full valuation allowance against our net deferred tax assets at each balance sheet date. We do not expect to have taxable income in the current year.

Critical Accounting Estimates

Our condensed consolidated financial statements are prepared in accordance with generally accepted accounting principles in the United States (“GAAP”). The preparation of our condensed consolidated financial statements and related disclosures requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenue, costs and expenses and the disclosure of contingent assets and liabilities in our condensed consolidated financial statements. We base our estimates on historical experience, known trends and events and various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. We evaluate our estimates and assumptions on an ongoing basis. Our actual results may differ from these estimates under different assumptions or conditions.

While our significant accounting policies are described in more detail in Note 2 to our consolidated financial statements in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023 as well as elsewhere in this Quarterly Report on Form 10-Q, we believe that revenue recognition and accrued research and development expenses are those most critical to the judgments and estimates used in the preparation of our condensed consolidated financial statements. There have been no material changes to our critical accounting policies and estimates detailed in the Critical Accounting Policies and Significant Judgements section of Item 7. Managements Discussion and Analysis of financial Condition and Results of Operations in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023.

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Results of Operations

Comparison of the Three Months Ended March 31, 2024 and 2023

The following table summarizes our results of operations for three months ended March 31, 2024 and 2023:


	Three Months Ended March 31,
	2024		2023		Change
	(in thousands)
Collaboration revenue	$	5,050	$	5,309	$	(259)
Operating expenses:
Research and development	25,534		29,985		(4,451)
General and administrative	7,710		8,641		(931)
Total operating expenses	33,244		38,626		(5,382)
Loss from operations	(28,194)		(33,317)		5,123
Other income, net:
Interest income	2,439		2,669		(230)
Other income, net	739		720		19
Total other income, net	3,178		3,389		(211)
Loss before income taxes	(25,016)		(29,928)		4,912
Provision for income taxes	—		(560)		560
Net loss	$	(25,016)	$	(30,488)	$	5,472

Collaboration Revenue

Under our collaboration agreements, revenue is recognized based on the work performed during the period. Collaboration revenue was $5.1 million for the three months ended March 31, 2024, compared to $5.3 million for the three months ended March 31, 2023. The decrease in collaboration revenue is attributed to the following:

•a decrease in Merck collaboration revenue recognition of $0.6 million driven by the termination of the Merck Collaboration Agreement in 2023;

Partially offset by:

•an increase in Lilly collaboration revenue recognition of $0.3 million primarily due to continued advancement of programs under the Lilly Collaboration Agreement.

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Research and Development Expenses

The following table summarizes our research and development expenses for the three months ended March 31, 2024 and 2023:


	Three Months Ended March 31,
	2024		2023		Change
	(in thousands)
Research and development program expenses:
FHD-286	$	3,526	$	4,031	$	(505)
Platform, research and discovery, and unallocated expenses:
Early development and other research external costs	9,173		9,790		(617)
Personnel related (including stock-based compensation)	7,710		10,373		(2,663)
Facilities and IT related expenses and other	5,125		5,791		(666)
Total research and development expenses	$	25,534	$	29,985	$	(4,451)

Research and development expenses were $25.5 million for the three months ended March 31, 2024, compared to $30.0 million for the three months ended March 31, 2023. The decrease is attributed to the following:

•a decrease in personnel-related costs of $2.7 million, including a $0.7 million decrease in stock-based compensation expense, due to decreased headcount in our research and development function compared to the prior period;

•a decrease in facilities and IT related expenses of $0.7 million, due to decreased headcount in our research and development function compared to the prior period;

•a decrease in early development and other research external costs of $0.6 million; which was driven by a $2.3 million decrease in FHD-609 spend due to the shutdown of the Phase 1 clinical trial in synovial sarcoma and SMARCAB1-loss tumors, partially offset by the continued investment and development of our platform and early research pipeline, including an increase of $0.9 million related to the advancement of Lilly partnered targets; and

•a decrease in our FHD-286 program costs of $0.5 million, primarily driven by a decline in clinical trial spend due to the completion and wind down of the Phase 1 uveal melanoma study.

General and Administrative Expenses

The following table summarizes our general and administrative expenses for the three months ended March 31, 2024 and 2023:


	Three Months Ended March 31,
	2024		2023		Change
	(in thousands)
Personnel related (including stock-based compensation)	$	4,470	$	5,769	$	(1,299)
Professional and consulting	1,944		1,624		320
Facilities and IT related expenses and other	1,296		1,248		48
Total general and administrative expenses	$	7,710	$	8,641	$	(931)

General and administrative expenses were $7.7 million for the three months ended March 31, 2024, compared to $8.6 million for the three months ended March 31, 2023. The decrease is primarily attributed to a decrease in personnel-related costs of $1.3 million, including a $0.7 million decrease in stock-based compensation expense, which was the result of decreased headcount in our general and administrative function compared to the prior period.

Other Income, Net

Other income, net was $3.2 million for the three months ended March 31, 2024, compared to $3.4 million for the three months ended March 31, 2023, which was relatively flat period-over-period.

Provision for income taxes

For the three months ended March 31, 2024, we recorded an income tax provision of none compared to $0.6 million for the three months ended March 31, 2023. The income tax provision for the three months ended March 31, 2023 was primarily driven by the federal and state taxes related to the $300.0 million upfront payment for Lilly Collaboration Agreement, which were recognized as taxable income in 2023, and the required capitalization of research and development costs pursuant to

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Internal Revenue Code Section 174. The Company did not record a provision for income taxes for the three months ended March 31, 2024.

Liquidity and Capital Resources

Since our inception in October 2015, we have incurred significant operating losses. We expect to incur significant expenses and operating losses for the foreseeable future as we support our continued research activities and development of our programs and platform. Through March 31, 2024, we have funded our operations with proceeds from our initial public offering (“IPO”) in October 2020, sales of preferred stock, term loans, an upfront payment of $15.0 million we received in July 2020 under the Merck Collaboration Agreement, proceeds we received in December 2021 under the Lilly SPA of $80.0 million; an upfront payment of $300.0 million received in January 2022 under the Lilly Collaboration Agreement and a payment of $5.0 million received from Merck under the Merck Collaboration Agreement for the achievement of a research milestone. As of March 31, 2024, we had cash, cash equivalents and marketable securities of $206.7 million.

Cash Flows

The following table summarizes our sources and uses of cash for each of the periods presented:


	Three Months Ended March 31,
	2024		2023
	(in thousands)
Net cash used in operating activities	$	(29,345)	$	(31,180)
Net cash provided by investing activities	27,095		29,505
Net cash provided by financing activities	1,167		102
Net decrease in cash, cash equivalents and restricted cash	$	(1,083)	$	(1,573)

Operating Activities

During the three months ended March 31, 2024, operating activities used $29.3 million of cash, resulting from the net cash used to fund our net loss of $25.0 million and changes in our operating assets and liabilities of $9.3 million partially offset by net non-cash charges of $4.9 million. Net cash used by changes in our operating assets and liabilities for the three months ended March 31, 2024 was primarily driven by a $5.1 million decrease in deferred revenue resulting from the recognition of revenue on the upfront payments received in connection with the the Lilly Collaboration Agreement, a $2.1 million net decrease in working capital and a $2.1 million decrease in operating lease liabilities .

During the three months ended March 31, 2023, operating activities used $31.2 million of cash, resulting from the net cash used to fund our net loss of $30.5 million and our changes in our operating assets and liabilities of $6.6 million partially offset by net non-cash charges of $5.9 million. Net cash used by changes in our operating assets and liabilities for the three months ended March 31, 2023 consisted primarily of $5.3 million decrease in deferred revenue resulting from the recognition of revenue on the upfront payments received in connection with our collaboration agreements and a $1.7 million decrease in operating lease liabilities partially offset by a $0.4 million net increase in working capital.

Investing Activities

During the three months ended March 31, 2024, net cash provided by investing activities was $27.1 million consisting of $58.5 million of maturities of marketable securities partially offset by $31.3 million of purchases of marketable securities and $0.1 million in purchases of property and equipment.

During the three months ended March 31, 2023, net cash provided by investing activities was $29.5 million consisting of $56.4 million of maturities of marketable securities partially offset by $26.2 million of purchases of marketable securities and $0.6 million in purchases of property and equipment.

Financing Activities

During the three months ended March 31, 2024, net cash provided by financing activities was $1.2 million consisting of net proceeds from the exercise of common stock options and the 2020 Employee Stock Purchase Plan (“ESPP”).

During the three months ended March 31, 2023, net cash provided by financing activities was $0.1 million consisting of net proceeds from the exercise of common stock options and the ESPP.

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Funding Requirements

We expect our expenses to increase substantially in connection with our ongoing activities, particularly as we advance the preclinical activities, initiate clinical trials for our product candidates in development, including those partnered with Lilly, and continue to fund on-going clinical activities. As of the issuance date of these interim condensed consolidated financial statements, we expect that our cash, cash equivalents and marketable securities will be sufficient to fund our operating expenses and capital expenditure requirements for at least twelve months. We have based this estimate on assumptions that may prove to be inaccurate. We could use our available capital resources sooner than we currently expect, in which case we would be required to obtain additional financing sooner than planned, which may not be available to us on acceptable terms, or at all. Our failure to raise capital as and when needed would have a negative impact on our financial condition and our ability to pursue our long-term business strategy. We will be required to obtain further funding through public or private equity offerings, debt financings, collaborations and licensing arrangements or other sources.

If we are unable to raise sufficient capital as and when needed, we may be required to significantly curtail, delay or discontinue one or more of our research or development programs or the commercialization of any product candidate we may develop, or be unable to expand our operations or otherwise capitalize on our business opportunities. If we raise additional funds through collaborations or licensing arrangements with third parties, we may have to relinquish valuable rights to future revenue streams or product candidates or grant licenses on terms that may not be favorable to us.

See “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023 for additional risks associated with our substantial capital requirements.

Off-balance Sheet Arrangements

We did not have during the periods presented, and we do not currently have, any off-balance sheet arrangements, as defined in the rules and regulations of the Securities and Exchange Commission.

Recently Issued Accounting Pronouncements

A description of recently issued accounting pronouncements that may potentially impact our financial position and results of operations is disclosed in Note 2 to our unaudited condensed consolidated financial statements appearing elsewhere in this Quarterly Report on Form 10-Q.

Item 3. Quantitative and Qualitative Disclosures About Market Risk.

We are a smaller reporting company, as defined in Rule 12b-2 under the Securities Exchange Act of 1934, as amended, for this reporting period and are not required to provide the information required under this item.

Item 4. Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

Our management, under the supervision and with the participation of our Principal Executive Officer (our Chief Executive Officer) and Principal Accounting and Financial Officer (our Chief Financial Officer), has evaluated the effectiveness of our disclosure controls and procedures as of period end. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended, or the Exchange Act, means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the company’s management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure. Management recognizes that any disclosure controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives, and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure controls and procedures as of March 31, 2024, our Principal Executive Officer and Principal Financial Officer concluded that, as of such date, our disclosure controls and procedures were effective at the reasonable assurance level.

Changes in Internal Control over Financial Reporting

No change in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) occurred during the three months ended March 31, 2024 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II—OTHER INFORMATION

Item 1. Legal Proceedings.

From time to time, we may become involved in litigation or other legal proceedings. We are not currently a party to any litigation or legal proceedings that, in the opinion of our management, are probable to have a material adverse effect on our business. Regardless of outcome, litigation can have an adverse impact on our business, financial condition, results of operations and prospects because of defense and settlement costs, diversion of management resources and other factors.

Item 1A. Risk Factors.

For a discussion of potential risks or uncertainties, please see “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023. There have been no material changes to the risk factors disclosed in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023.

Item 5. Other Information.

During the three months ended March 31, 2024, the following Rule 10b5-1 trading arrangements (as defined in Item 408 of Regulation S-K of the Securities Act of 1933) were adopted by our directors and officers (as defined in Rule 16a-1(f) of the Securities Exchange Act of 1934), each of which was intended to satisfy the affirmative defense of Rule10b5-1(c):

On March 11, Steven Bellon, our Chief Scientific Officer, adopted a Rule 10b5-1 trading arrangement. Dr. Bellon’s trading arrangement provides for the sale of up to 60,000 shares of our common stock through March 10, 2025.

On March 11, Carlos Costa, our Chief People Officer, adopted a Rule 10b5-1 trading arrangement. Mr. Costa’s trading arrangement provides for the sale of up to 213,106 shares of our common stock through March 10, 2025.

During the three months ended March 31, 2024, none of our directors or officers (as defined in Rule 16a-1(f) under the Securities Exchange Act of 1934, as amended) entered into, modified (as to amount, price or timing of trades) or terminated any non-Rule 10b5-1 trading arrangements.

Table of Contents

Item 6. Exhibits.


Exhibit Number						Description
31.1*						Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*						Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1**						Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2**						Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

101.INS*						XBRL Instance Document
101.SCH*						XBRL Taxonomy Extension Schema Document
101.CAL*						XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF*						XBRL Taxonomy Extension Definition Linkbase Document
101.LAB*						XBRL Taxonomy Extension Label Linkbase Document
101.PRE*						XBRL Taxonomy Extension Presentation Linkbase Document

______________

*Filed herewith.

** Furnished herewith.

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.


	FOGHORN THERAPEUTICS, INC.

Date: May 6, 2024	By:	/s/ Kristian Humer
		Kristian Humer Chief Financial Officer (Principal Accounting and Financial Officer)

Exhibit 31.1

CERTIFICATION PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Adrian Gottschalk, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Foghorn Therapeutics 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.


Date: May 6, 2024

/s/ Adrian Gottschalk
Adrian Gottschalk President, Chief Executive Officer and Director (Principal Executive Officer)

Exhibit 31.2

CERTIFICATION PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Kristian Humer, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Foghorn Therapeutics Inc.;

(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.


Date: May 6, 2024

/s/ Kristian Humer
Kristian Humer Chief Financial Officer (Principal Accounting and Financial Officer)

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Foghorn Therapeutics Inc. (the “Company”) on Form 10-Q for the quarter ended March 31, 2024 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1)The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

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


Date: May 6, 2024

/s/ Adrian Gottschalk
Adrian Gottschalk President, Chief Executive Officer and Director (Principal Executive Officer)

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

(1)The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

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


Date: May 6, 2024

/s/ Kristian Humer
Kristian Humer Chief Financial Officer (Principal Accounting and Financial Officer)

Cover Page - shares	3 Months Ended
Cover Page - shares	Mar. 31, 2024	Apr. 30, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	001-39634
Entity Registrant Name	Foghorn Therapeutics Inc.
Entity Incorporation, State	DE
Entity Tax Identification Number	47-5271393
Entity Address, Street Name	500 Technology Square, Ste 700
Entity Address, City	Cambridge
Entity Address, State	MA
Entity Address, Postal Zip Code	02139
City Area Code	617
Local Phone Number	586-3100
Title of each class	Common Stock, $0.0001 par value per share
Trading Symbol(s)	FHTX
Name of each exchange on which registered	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		42,585,616
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001822462
Current Fiscal Year End Date	--12-31

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 79,253	$ 80,336
Marketable securities	127,408	153,721
Prepaid expenses and other current assets	4,859	6,124
Total current assets	211,520	240,181
Property and equipment, net	12,187	12,956
Restricted cash	1,708	1,708
Other assets	1,052	1,115
Operating lease right-of-use assets	28,537	29,956
Total assets	255,004	285,916
Current liabilities:
Accounts payable	5,631	6,260
Accrued expenses and other current liabilities	6,265	9,108
Operating lease liabilities	8,668	8,518
Deferred revenue	31,501	34,550
Total current liabilities	52,065	58,436
Operating lease liabilities, net of current portion	34,311	36,555
Deferred revenue, net of current portion	266,114	268,115
Total liabilities	352,490	363,106
Commitments and contingencies (Note 9)
Stockholders’ deficit:
Preferred stock, $0.0001 par value; 25,000,000 shares authorized at March 31, 2024 and December 31, 2023; no shares issued and outstanding at March 31, 2024 and December 31, 2023	0	0
Common stock, $0.0001 par value; 175,000,000 shares authorized at March 31, 2024 and December 31, 2023; 42,585,616 shares issued and outstanding at March 31, 2024 and 42,282,040 shares issued and outstanding at December 31, 2023	4	4
Additional paid-in capital	399,587	395,196
Accumulated other comprehensive loss	(497)	(826)
Accumulated deficit	(496,580)	(471,564)
Total stockholders’ deficit	(97,486)	(77,190)
Total liabilities and stockholders’ deficit	$ 255,004	$ 285,916

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	25,000,000	25,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	175,000,000	175,000,000
Common stock, shares issued (in shares)	42,585,616	42,282,040
Common stock, shares outstanding (in shares)	42,585,616	42,282,040

Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Collaboration revenue	$ 5,050	$ 5,309
Operating expenses:
Research and development	25,534	29,985
General and administrative	7,710	8,641
Total operating expenses	33,244	38,626
Loss from operations	(28,194)	(33,317)
Other income, net:
Interest income	2,439	2,669
Other income, net	739	720
Total other income, net	3,178	3,389
Loss before income taxes	(25,016)	(29,928)
Provision for income taxes	0	(560)
Net loss	$ (25,016)	$ (30,488)
Net loss per share attributable to common stockholders—basic (in dollars per share)	$ (0.59)	$ (0.73)
Net loss per share attributable to common stockholders—diluted (in dollars per share)	$ (0.59)	$ (0.73)
Weighted average common shares outstanding—basic (in shares)	42,428,813	41,811,087
Weighted average common shares outstanding—diluted (in shares)	42,428,813	41,811,087
Comprehensive loss:
Net loss	$ (25,016)	$ (30,488)
Other comprehensive gain:
Unrealized gains on marketable securities	329	1,116
Total other comprehensive gain	329	1,116
Total comprehensive loss	$ (24,687)	$ (29,372)
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	Collaboration Revenue [Member]	Collaboration Revenue [Member]

Condensed Consolidated Statements of Stockholders’ Equity (Deficit) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Gain (Loss)	Accumulated Deficit
Beginning balance at Dec. 31, 2022	$ 112	$ 4	$ 377,232	$ (3,986)	$ (373,138)
Beginning balance (in shares) at Dec. 31, 2022		41,803,436
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of stock options and employee stock purchase plan	102		102
Issuance of common stock upon exercise of stock options and employee stock purchase plan (in shares)		21,322
Stock-based compensation expense	4,572		4,572
Unrealized gains on marketable securities	1,116			1,116
Net loss	(30,488)				(30,488)
Ending balance at Mar. 31, 2023	(24,586)	$ 4	381,906	(2,870)	(403,626)
Ending balance (in shares) at Mar. 31, 2023		41,824,758
Beginning balance at Dec. 31, 2023	$ (77,190)	$ 4	395,196	(826)	(471,564)
Beginning balance (in shares) at Dec. 31, 2023	42,282,040	42,282,040
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of stock options and employee stock purchase plan	$ 1,167		1,167
Issuance of common stock upon exercise of stock options and employee stock purchase plan (in shares)		303,576
Stock-based compensation expense	3,224		3,224
Unrealized gains on marketable securities	329			329
Net loss	(25,016)				(25,016)
Ending balance at Mar. 31, 2024	$ (97,486)	$ 4	$ 399,587	$ (497)	$ (496,580)
Ending balance (in shares) at Mar. 31, 2024	42,585,616	42,585,616

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (25,016)	$ (30,488)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	3,224	4,572
Depreciation and amortization expense	835	859
Noncash lease expense	1,419	1,200
Accretion of discount on marketable securities	(554)	(770)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	1,328	887
Accounts payable	(629)	1,691
Accrued expenses and other liabilities	(2,808)	(2,154)
Operating lease liabilities	(2,094)	(1,668)
Deferred revenue	(5,050)	(5,309)
Net cash used in operating activities	(29,345)	(31,180)
Cash flows from investing activities:
Purchases of property and equipment	(101)	(636)
Purchases of marketable securities	(31,263)	(26,232)
Proceeds from maturities of marketable securities	58,459	56,373
Net cash provided by investing activities	27,095	29,505
Cash flows from financing activities:
Proceeds from issuance of common stock upon exercise of stock options and employee stock purchase plan	1,167	102
Net cash provided by financing activities	1,167	102
Net decrease in cash, cash equivalents and restricted cash	(1,083)	(1,573)
Cash, cash equivalents and restricted cash at beginning of period	82,044	53,922
Cash, cash equivalents and restricted cash at end of period	80,961	52,349
Supplemental disclosure of noncash investing and financing information:
Cash paid for taxes	49	0
Purchases of property and equipment included in accounts payable and accrued expenses	0	298
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	79,253	50,641
Restricted cash (current and non-current)	1,708	1,708
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 80,961	$ 52,349

Nature of Business, Going Concern and Basis of Presentation	3 Months Ended
	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business, Going Concern and Basis of Presentation	Nature of Business, Going Concern and Basis of Presentation Foghorn Therapeutics Inc. (the “Company”) is a clinical-stage biopharmaceutical company discovering and developing a new class of medicines targeting genetically determined dependencies within the chromatin regulatory system. The Company uses its proprietary Gene Traffic Control platform to identify, validate and potentially drug targets within the system. The Company was founded in October 2015 as a Delaware corporation. The Company is headquartered in Cambridge, Massachusetts. The Company is subject to risks similar to those of other early-stage companies in the biopharmaceutical industry, including dependence on key individuals, the need to develop commercially viable products, competition from other companies, many of whom are larger and better capitalized, and the need to obtain adequate additional financing to fund the development of its products. There can be no assurance that the Company’s research and development will be successfully completed, that adequate protection for the Company’s intellectual property will be maintained, that any products developed will obtain required regulatory approval or that any approved products will be commercially viable. Even if the Company’s development efforts are successful, it is uncertain when, if ever, the Company will generate significant revenue from the sale of its products. Going concern The accompanying condensed consolidated financial statements have been prepared on the basis of continuity of operations, realization of assets and the satisfaction of liabilities and commitments in the ordinary course of business. Since inception, the Company has funded its operations primarily with proceeds from sales of preferred stock, upfront and milestone payments from collaboration agreements, a public offering and a stock purchase agreement. The Company has incurred recurring losses, including net losses of $25.0 million and $30.5 million for the three months ended March 31, 2024 and 2023, respectively. As of March 31, 2024, the Company had an accumulated deficit of $496.6 million. The Company expects to continue to generate operating losses in the foreseeable future. As of the issuance date of these interim condensed consolidated financial statements the Company expects that its cash, cash equivalents and marketable securities will be sufficient to fund its operating expenses and capital expenditure requirements for at least 12 months. The Company will need to obtain additional funding through public or private equity offerings, debt financings, collaborations, strategic alliances and/or licensing arrangements to continue to fund its operations. The Company may not be able to obtain financing on acceptable terms, or at all, and the Company may not be able to enter into collaborative or strategic alliances or licensing arrangements. The terms of any financing may adversely affect the holdings or the rights of the Company’s stockholders. Arrangements with collaborators or others may require the Company to relinquish rights to certain of its technologies or programs. If the Company is unable to obtain funding, the Company could be forced to delay, reduce or eliminate some or all of its research and development programs, pipeline expansion or commercialization efforts, which could adversely affect its business prospects. Although management will continue to pursue these plans, there is no assurance that the Company will be successful in obtaining sufficient funding in the future on terms acceptable to the Company to fund continuing operations when needed or at all. Basis of presentation The Company’s condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and pursuant to the rules and regulations of the United States Securities and Exchange Commission for interim financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. The accompanying condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary. All intercompany accounts and transactions have been eliminated in consolidation. Any reference in these notes to applicable guidance is meant to refer to the authoritative GAAP as found in the Accounting Standards Codification (“ASC”) and Accounting Standards Update (“ASU”) of the Financial Accounting Standards Board (“FASB”).

Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2024
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies The accounting policies of the Company are set forth in Note 2 to the consolidated financial statements contained in the Company’s 2023 Annual Report on Form 10-K, and the accounting policies followed by the Company for interim financial reporting are consistent with the accounting policies therein.

Marketable Securities and Fair Value Measurements

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

Marketable Securities and Fair Value Measurements

As of March 31, 2024, available for sale marketable securities by security type consisted of (in thousands):


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
U.S. treasury notes (due within one year)	$	7,468	$	—	$	(1)	$	7,467
U.S. government agencies (due within one year)	7,833		—		(13)		7,820
Commercial paper (due within one year)	6,972		2		(15)		6,959
Corporate notes and bonds (due within one year)	92,063		3		(416)		91,650

Corporate notes and bonds (due after one year through two years)	13,569		—		(57)		13,512
Total	$	127,905	$	5	$	(502)	$	127,408

As of December 31, 2023, available for sale marketable securities by security type consisted of (in thousands):


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value

U.S. government agencies (due within one year)	11,823		—		(26)		11,797
Commercial paper (due within one year)	5,901		7		(2)		5,906
Corporate notes and bonds (due within one year)	130,933		11		(784)		130,160
Corporate notes and bonds (due after one year through two years)	5,890		—		(32)		5,858
Total	$	154,547	$	18	$	(844)	$	153,721

The following tables present the Company’s fair value hierarchy for its assets and liabilities, which are measured at fair value on a recurring basis (in thousands):


	Fair Value Measurements at March 31, 2024 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	62,312	$	—	$	—	$	62,312
U.S. treasury notes	—		16,941		—		16,941

Marketable securities:
U.S. treasury notes	—		7,467		—		7,467
U.S. government agencies	—		7,820		—		7,820
Commercial paper	—		6,959		—		6,959
Corporate notes and bonds	—		105,162		—		105,162
Total	$	62,312	$	144,349	$	—	$	206,661
	Fair Value Measurements at December 31, 2023 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	53,336	$	—	$	—	$	53,336
U.S. treasury notes	—		27,000		—		27,000

Marketable securities:

U.S. government agencies	—		11,797		—		11,797
Commercial paper	—		5,906		—		5,906
Corporate notes and bonds	—		136,018		—		136,018
Total	$	53,336	$	180,721	$	—	$	234,057

For the three months ended March 31, 2024 and 2023, there were no transfers between Level 1, Level 2 and Level 3.

Property and Equipment, Net

3 Months Ended

Mar. 31, 2024

Property, Plant and Equipment [Abstract]

Property and Equipment, Net

Property and equipment, net consisted of the following (in thousands):


	March 31, 2024		December 31, 2023
Laboratory equipment	$	6,869	$	6,804
Furniture and fixtures	815		815
Computer equipment and software	74		115
Leasehold improvements	17,239		17,239

	24,997		24,973
Less: Accumulated depreciation and amortization	(12,810)		(12,017)
	$	12,187	$	12,956

Depreciation and amortization expense was $0.8 million and $0.9 million for the three months ended March 31, 2024 and 2023, respectively.

Accrued Expenses and Other Current Liabilities

3 Months Ended

Mar. 31, 2024

Payables and Accruals [Abstract]

Accrued Expenses and Other Current Liabilities

Accrued expenses consisted of the following (in thousands):


	March 31, 2024		December 31, 2023
Accrued external research and development expenses	$	3,355	$	3,646
Accrued employee compensation and benefits	1,619		4,347
Accrued income taxes	674		674
Accrued professional fees	617		441


	$	6,265	$	9,108

Common Stock and Net Loss Per Share

3 Months Ended

Mar. 31, 2024

Equity [Abstract]

Common Stock and Net Loss Per Share

Common Stock

Net Loss Per Share


	March 31,
	2024	2023
Stock options to purchase common stock	9,597,719	9,666,311
Warrants to purchase common stock	18,445	18,445
	9,616,164	9,684,756

Stock-Based Compensation

3 Months Ended

Mar. 31, 2024

Share-Based Payment Arrangement [Abstract]

Stock-Based Compensation

2020 Equity Incentive Plan

2020 Employee Stock Purchase Plan

Stock-Based Compensation

Stock-based compensation expense was classified in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):


	Three Months Ended March 31,
	2024		2023
Research and development expenses	$	1,341	$	2,039
General and administrative expenses	1,883		2,533
	$	3,224	$	4,572

As of March 31, 2024, total unrecognized compensation cost related to unvested options was $23.3 million, which is expected to be recognized over a weighted average period of 2.3 years.

Collaboration Agreements	3 Months Ended
Collaboration Agreements	Mar. 31, 2024
Collaboration Agreement [Abstract]
Collaboration Agreements	Collaboration Agreements Lilly Collaboration Agreement and Stock Purchase Agreement In December 2021, the Company entered into a collaboration agreement (the “Lilly Collaboration Agreement”) with Loxo Oncology at Eli Lilly and Company (“Lilly”) to create novel oncology medicines by applying Foghorn’s proprietary Gene Traffic Control platform. The collaboration includes a co-development and co-commercialization agreement for the Company’s selective BRM oncology target, consisting of two programs, and one additional undisclosed oncology target (collectively, the “Joint Programs”). The collaboration also includes three additional discovery targets or programs (collectively, the “Discovery Programs”) for a total of six programs directed at five targets. With respect to the Joint Programs, the Company will lead discovery and early research activities through the successful completion of dose finding toxicity studies for the identified compound, while Lilly will lead development and commercialization activities of the identified compound with participation from the Company in development activities and 50% cost sharing until registrational clinical trials. The Company and Lilly may jointly develop and commercialize the Joint Program compound though the Company may, in its sole discretion, opt-out on a program-by-program basis of further participation in the development and commercialization efforts prior to the first registrational clinical trial. If the Company does not opt-out, Lilly and the Company will continue to share in the costs to further develop and commercialize the Joint Program compound on a worldwide basis, equally share in the U.S. profits on product sales, subject to certain adjustments and receive royalties on sales outside of the United States (“Ex-U.S.”) at royalty rates ranging from low double digits to high twenties. If the Company opts-out of further development and commercialization efforts, it will have no further obligations to share in the development and commercialization costs, will receive royalties rather than profit share on U.S. sales and will receive royalties at a lower rate on Ex-U.S. sales. With respect to the Discovery Programs, the Company will lead discovery and early research activities through the successful completion of dose finding toxicity studies for the identified compounds. The Company may, in its sole discretion, opt-in on a program-by-program basis after the successful completion of dose finding toxicity to participate in the further development and commercialization efforts of the Discovery Program compounds. If the Company opts-in to the development and commercialization of the Discovery Program compounds, it will be eligible to receive milestone payments of up to $10.0 million per program upon specified research and development milestones and up to $180.0 million per program upon achievement of specified regulatory and commercial milestones and will also be eligible to share in the U.S. profits at pre-determined percentages on product sales. The Company would also be eligible to receive tiered Ex-U.S. royalty rates, calculated on a product-by-product and country-by-country basis, on net sales outside of the United States, if any, ranging from low single digits to low double digits, but less then teens. If the Company does not opt-in to further development and commercialization efforts for the Discovery Programs, it will be eligible to receive milestone payments of up to $70.0 million per program upon specified research and development milestones and up to $360.0 million per program upon achievement of specified regulatory and commercial milestones per approved product, if any. The Company would also be eligible to receive tiered royalties on net sales of products worldwide at royalty rates ranging from low single digits to low double digits, but less than teens. Lilly has the right to make substitutions for each of the five targets during the research term of each program, subject to certain limitations. Pursuant to the Lilly Collaboration Agreement, the Company will also participate in joint decision-making through the joint steering committee and subcommittees. Unless terminated earlier, the Lilly Collaboration Agreement will continue on a product-by-product basis until the expiration of all royalty obligations under the Lilly Collaboration Agreement and when neither the Company nor Lilly is developing, commercializing or manufacturing any product under the Lilly Collaboration Agreement. The Company or Lilly may terminate the Lilly Collaboration Agreement upon an uncured material breach by the other party. Lilly may also terminate the Lilly Collaboration Agreement in its entirety or on a target-by-target, program-by-program or product-by-product basis for any reason upon certain notice to the Company. The Company determined that (1) the research activities performed by the Company for both the Joint Programs and the Discovery Programs (2) the development activities and cost sharing for the Joint Program development efforts after dose finding toxicity until registrational clinical trials (3) the research, development, manufacture and commercialization licenses and (4) service on the joint steering committee and subcommittees represent a single performance obligation under the Lilly Collaboration Agreement. The Company determined that Lilly cannot benefit from the licenses separately from the research activities, the development activities until registrational clinical trials and participation on the joint steering committee and subcommittees because these services are specialized and rely on the Company’s expertise such that these activities are highly interrelated and therefore not distinct. Accordingly, the promised goods and services represent one combined performance obligation, and the entire transaction price was allocated to that single combined performance obligation. The performance obligation will be satisfied over time as the Company performs the research activities, participates and shares in the cost of the development activities for the Joint Programs and participates in a joint steering committee and subcommittees to oversee these activities. The Company’s options to share in further development and commercialization efforts via its opt-in/opt-out rights will be assessed and accounted for as separate units of accounting under the relevant guidance if, and when, such options are exercised by the Company. During the third quarter of 2023, the Company has transitioned the BRM Selective inhibitor program into development activities for which Lilly will lead and the Company will participate and share in 50% of the costs until at least registrational trials. Costs incurred will continue to be included in research and development expenses on the condensed consolidated statements of operations and comprehensive loss. As of March 31, 2024, the aggregate amount of the transaction price related to the unsatisfied portion of the performance obligation was $297.6 million, which is expected to be recognized as revenue through 2029 or beyond depending on the timing of certain clinical development activities. The Company does not expect collaboration revenue to be recognized evenly over this period as it will be recognized on a percentage of completion basis (using a cost-to-cost method) as the Company performs the research and development activities and participates on the joint steering committee and subcommittees, which will likely vary from period to period. In estimating the total costs to satisfy its single performance obligation pursuant to the Lilly Collaboration Agreement, the Company is required to make significant estimates including an estimate of the number of target substitutions Lilly may elect to make and the expected time and expected costs to fulfill the performance obligation. The cumulative effect of revisions to the total estimated costs to complete the Company’s single performance obligation will be recorded in the period in which the changes are identified, and amounts can be reasonably estimated. While such revisions will have no impact on the Company’s cash flows, a significant change in these assumptions and estimates could have a material impact on the timing and amount of revenue recognized in future periods and the classification of deferred revenue between short-term and long-term. For the three months ended March 31, 2024 and 2023, the Company had recorded $5.1 million and $4.7 million, respectively, of revenue under the Lilly Collaboration Agreement, which was included in deferred revenue at the beginning of the respective periods. As of March 31, 2024 and December 31, 2023, the Company had a payable to Lilly of $1.2 million and $1.5 million recorded in accrued expenses and other current liabilities on the Company’s consolidated balance sheets. Merck Collaboration Agreement In July 2020, the Company entered into the Merck Collaboration Agreement with Merck, pursuant to which the Company and Merck applied Foghorn’s proprietary Gene Traffic Control platform to discover and develop novel therapeutics. Under the terms of the Merck Collaboration Agreement, the Company and Merck were each responsible to perform certain research activities in accordance with a mutually-agreed upon research plan. For the three months ended March 31, 2023, the Company had recorded $0.6 million of the revenue under the Merck Collaboration Agreement, which was included in deferred revenue at the beginning of the respective periods and the classification of deferred revenue between short term and long term. On August 9, 2023 the Company received notice from Merck that it is terminating the Merck Collaboration Agreement effective November 7, 2023 and, accordingly, all remaining deferred revenue was recognized at that time. As of December 31, 2023, there was no remaining performance obligation, and no corresponding deferred revenue remaining, under the Merck Collaboration Agreement.

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Leases The Company leases office space under a non-cancelable operating lease. There have been no material changes to the Company's lease during the three months ended March 31, 2024. For additional information, see Note 10, Leases, to the consolidated financial statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2023. License agreements The Company has entered into various exclusive and non-exclusive license agreements for certain technologies. Under the terms of these license agreements, the Company could be required to reimburse the licensors for patent expenses and remit amounts in the low single-digit as sales-based royalties upon the occurrence of specific events as outlined in the corresponding license agreements. The Company is also required to make annual license maintenance fees of less than $0.3 million and pay up to $1.1 million in regulatory milestones on each licensed product upon the occurrence of specific events as outlined in one of the license agreements. None of our product candidates utilize technologies covered by these licenses. Indemnification agreements In the ordinary course of business, the Company may provide indemnification of varying scope and terms to vendors, lessors, contract research organizations, business partners and other parties with respect to certain matters including, but not limited to, losses arising out of breach of such agreements or from intellectual property infringement claims made by third parties. In addition, the Company has entered into indemnification agreements with members of its board of directors and its executive officers that will require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors or officers. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is, in many cases, unlimited. The Company has not incurred any material costs as a result of such indemnifications and is not currently aware of any indemnification claims. Legal Proceedings From time to time, the Company may become involved in litigation or other legal proceedings. The Company is not currently a party to any material litigation or legal proceedings.

Related Parties	3 Months Ended
Related Parties	Mar. 31, 2024
Related Party Transactions [Abstract]
Related Parties	Related Parties In October 2015, the Company entered into a five-year consulting agreement with a scientific founder of the Company who is also a shareholder. This agreement was amended and extended to January 1, 2025 and is subject to automatic one-year renewal terms until terminated if notice is provided more than 30 days before the current end of term date. During the three months ended March 31, 2024 and 2023, the Company paid the scientific founder a de minimis amount. As of March 31, 2024 and December 31, 2023, the Company had less than $0.1 million, respectively, of accounts payable due to the scientific founder. On December 10, 2021, we entered into the Lilly Collaboration Agreement with Lilly. Concurrent with the Lilly Collaboration Agreement the Company also entered into a stock purchase agreement with Lilly (the “Lilly SPA”) where the Company issued and sold Lilly 4,000,000 shares of our common stock at a price of $20.00 per share, making them a 5% or greater shareholder in the Company for the three months ended March 31, 2024 and 2023. We are obligated to make certain payments to Lilly pursuant to the Lilly Collaboration Agreement. During the three months ended March 31, 2024, the Company paid Lilly $1.7 million. The Company made no payments to Lilly during the three months ended March 31, 2023. As of March 31, 2024 and December 31, 2023, the Company had a payable of $1.2 million and $1.5 million, respectively, due to Lilly.

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net loss	$ (25,016)	$ (30,488)

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2024 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Steven Bellon [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On March 11, Steven Bellon, our Chief Scientific Officer, adopted a Rule 10b5-1 trading arrangement. Dr. Bellon’s trading arrangement provides for the sale of up to 60,000 shares of our common stock through March 10, 2025.
Name	Steven Bellon
Title	Chief Scientific Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	March 11
Arrangement Duration	364 days
Aggregate Available	60,000
Carlos Costa [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On March 11, Carlos Costa, our Chief People Officer, adopted a Rule 10b5-1 trading arrangement. Mr. Costa’s trading arrangement provides for the sale of up to 213,106 shares of our common stock through March 10, 2025. During the three months ended March 31, 2024, none of our directors or officers (as defined in Rule 16a-1(f) under the Securities Exchange Act of 1934, as amended) entered into, modified (as to amount, price or timing of trades) or terminated any non-Rule 10b5-1 trading arrangements.
Name	Carlos Costa
Title	Chief People Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	March 11
Arrangement Duration	364 days
Aggregate Available	213,106

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2024
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation The Company’s condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and pursuant to the rules and regulations of the United States Securities and Exchange Commission for interim financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. The accompanying condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary. All intercompany accounts and transactions have been eliminated in consolidation. Any reference in these notes to applicable guidance is meant to refer to the authoritative GAAP as found in the Accounting Standards Codification (“ASC”) and Accounting Standards Update (“ASU”) of the Financial Accounting Standards Board (“FASB”).

Marketable Securities and Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

Summary of Available for Sale Marketable Securities by Security Type

As of March 31, 2024, available for sale marketable securities by security type consisted of (in thousands):


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
U.S. treasury notes (due within one year)	$	7,468	$	—	$	(1)	$	7,467
U.S. government agencies (due within one year)	7,833		—		(13)		7,820
Commercial paper (due within one year)	6,972		2		(15)		6,959
Corporate notes and bonds (due within one year)	92,063		3		(416)		91,650

Corporate notes and bonds (due after one year through two years)	13,569		—		(57)		13,512
Total	$	127,905	$	5	$	(502)	$	127,408

As of December 31, 2023, available for sale marketable securities by security type consisted of (in thousands):


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value

U.S. government agencies (due within one year)	11,823		—		(26)		11,797
Commercial paper (due within one year)	5,901		7		(2)		5,906
Corporate notes and bonds (due within one year)	130,933		11		(784)		130,160
Corporate notes and bonds (due after one year through two years)	5,890		—		(32)		5,858
Total	$	154,547	$	18	$	(844)	$	153,721

Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following tables present the Company’s fair value hierarchy for its assets and liabilities, which are measured at fair value on a recurring basis (in thousands):


	Fair Value Measurements at March 31, 2024 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	62,312	$	—	$	—	$	62,312
U.S. treasury notes	—		16,941		—		16,941

Marketable securities:
U.S. treasury notes	—		7,467		—		7,467
U.S. government agencies	—		7,820		—		7,820
Commercial paper	—		6,959		—		6,959
Corporate notes and bonds	—		105,162		—		105,162
Total	$	62,312	$	144,349	$	—	$	206,661
	Fair Value Measurements at December 31, 2023 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	53,336	$	—	$	—	$	53,336
U.S. treasury notes	—		27,000		—		27,000

Marketable securities:

U.S. government agencies	—		11,797		—		11,797
Commercial paper	—		5,906		—		5,906
Corporate notes and bonds	—		136,018		—		136,018
Total	$	53,336	$	180,721	$	—	$	234,057

Property and Equipment, Net (Tables)

3 Months Ended

Mar. 31, 2024

Property, Plant and Equipment [Abstract]

Summary of Property and Equipment Net

Property and equipment, net consisted of the following (in thousands):


	March 31, 2024		December 31, 2023
Laboratory equipment	$	6,869	$	6,804
Furniture and fixtures	815		815
Computer equipment and software	74		115
Leasehold improvements	17,239		17,239

	24,997		24,973
Less: Accumulated depreciation and amortization	(12,810)		(12,017)
	$	12,187	$	12,956

Accrued Expenses and Other Current Liabilities (Tables)

3 Months Ended

Mar. 31, 2024

Payables and Accruals [Abstract]

Summary of Accrued Expenses

Accrued expenses consisted of the following (in thousands):


	March 31, 2024		December 31, 2023
Accrued external research and development expenses	$	3,355	$	3,646
Accrued employee compensation and benefits	1,619		4,347
Accrued income taxes	674		674
Accrued professional fees	617		441


	$	6,265	$	9,108

Common Stock and Net Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2024

Equity [Abstract]

Summary of Earnings Per Share Diluted Anti Dilutive Impact


	March 31,
	2024	2023
Stock options to purchase common stock	9,597,719	9,666,311
Warrants to purchase common stock	18,445	18,445
	9,616,164	9,684,756

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2024

Share-Based Payment Arrangement [Abstract]

Summary of Stock-Based Compensation Expense

Stock-based compensation expense was classified in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):


	Three Months Ended March 31,
	2024		2023
Research and development expenses	$	1,341	$	2,039
General and administrative expenses	1,883		2,533
	$	3,224	$	4,572

Nature of Business, Going Concern and Basis of Presentation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net loss	$ 25,016	$ 30,488
Accumulated deficit	$ 496,580		$ 471,564

Marketable Securities and Fair Value Measurements - Summary of Available for Sale Marketable Securities by Security Type (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Amortized Cost	$ 127,905	$ 154,547
Gross Unrealized Gains	5	18
Gross Unrealized Losses	(502)	(844)
Estimated Fair Value	127,408	153,721
U.S. treasury notes (due within one year)
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Amortized Cost	7,468
Gross Unrealized Gains	0
Gross Unrealized Losses	(1)
Estimated Fair Value	7,467
U.S. government agencies (due within one year)
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Amortized Cost	7,833	11,823
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(13)	(26)
Estimated Fair Value	7,820	11,797
Commercial paper (due within one year)
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Amortized Cost	6,972	5,901
Gross Unrealized Gains	2	7
Gross Unrealized Losses	(15)	(2)
Estimated Fair Value	6,959	5,906
Corporate notes and bonds (due within one year)
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Amortized Cost	92,063	130,933
Gross Unrealized Gains	3	11
Gross Unrealized Losses	(416)	(784)
Estimated Fair Value	91,650	130,160
Corporate notes and bonds (due after one year through two years)
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Amortized Cost	13,569	5,890
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(57)	(32)
Estimated Fair Value	$ 13,512	$ 5,858

Marketable Securities and Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	$ 127,408	$ 153,721
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	6,959	5,906
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	206,661	234,057
Recurring \| U.S. treasury notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	7,467
Recurring \| U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	7,820	11,797
Recurring \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	6,959	5,906
Recurring \| Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	105,162	136,018
Recurring \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	62,312	53,336
Recurring \| U.S. treasury notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	16,941	27,000
Recurring \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	62,312	53,336
Recurring \| Level 1 \| U.S. treasury notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	0
Recurring \| Level 1 \| U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	0	0
Recurring \| Level 1 \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	0	0
Recurring \| Level 1 \| Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	0	0
Recurring \| Level 1 \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	62,312	53,336
Recurring \| Level 1 \| U.S. treasury notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0	0
Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	144,349	180,721
Recurring \| Level 2 \| U.S. treasury notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	7,467
Recurring \| Level 2 \| U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	7,820	11,797
Recurring \| Level 2 \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	6,959	5,906
Recurring \| Level 2 \| Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	105,162	136,018
Recurring \| Level 2 \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0	0
Recurring \| Level 2 \| U.S. treasury notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	16,941	27,000
Recurring \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	0	0
Recurring \| Level 3 \| U.S. treasury notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	0
Recurring \| Level 3 \| U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	0	0
Recurring \| Level 3 \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	0	0
Recurring \| Level 3 \| Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	0	0
Recurring \| Level 3 \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0	0
Recurring \| Level 3 \| U.S. treasury notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	$ 0	$ 0

Property and Equipment, Net - Summary of Property and Equipment Net (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization
Property plant and equipment including finance right of use assets, gross	$ 24,997	$ 24,973
Less: Accumulated depreciation and amortization	(12,810)	(12,017)
Property and equipment, net	12,187	12,956
Laboratory equipment
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization
Property plant and equipment including finance right of use assets, gross	6,869	6,804
Furniture and fixtures
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization
Property plant and equipment including finance right of use assets, gross	815	815
Computer equipment and software
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization
Property plant and equipment including finance right of use assets, gross	74	115
Leasehold improvements
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization
Property plant and equipment including finance right of use assets, gross	$ 17,239	$ 17,239

Property and Equipment, Net - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 835	$ 859

Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Payables and Accruals [Abstract]
Accrued external research and development expenses	$ 3,355	$ 3,646
Accrued employee compensation and benefits	1,619	4,347
Accrued income taxes	674	674
Accrued professional fees	617	441
Total	$ 6,265	$ 9,108

Common Stock and Net Loss Per Share - Narrative (Details)	Mar. 31, 2024 vote
Equity [Abstract]
Voting rights per share (per share)	1

Common Stock and Net Loss Per Share - Summary of Earnings Per Share Diluted Anti Dilutive Impact (Details) - shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share
Anti-dilutive shares excluded from the calculation of earnings per share (in shares)	9,616,164	9,684,756
Stock options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Anti-dilutive shares excluded from the calculation of earnings per share (in shares)	9,597,719	9,666,311
Warrants to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Anti-dilutive shares excluded from the calculation of earnings per share (in shares)	18,445	18,445

Stock-Based Compensation - Additional Information (Details) $ in Millions			3 Months Ended
	Jan. 01, 2024 shares	Oct. 21, 2020 shares	Mar. 31, 2024 USD ($) period shares	Mar. 31, 2023 USD ($)	Dec. 31, 2023 shares
Share-based Payment Arrangement
Number of shares authorized (in shares)	1,566,120
Unrecognized compensation costs related to unvested options and unvested restricted stock \| $			$ 23.3
Weighted average period of unrecognized compensation costs			2 years 3 months 18 days
2020 Equity Incentive Plan
Share-based Payment Arrangement
Number of shares authorized (in shares)			2,200,000
Common stock shares available for grant (in shares)			2,391,808
Percentage of automatic annual increase in number of shares			4.00%
Number of additional shares authorized (in shares)	1,691,281
Vesting period (years)			4 years
Stock option expiry period (years)			10 years
2016 Stock Incentive Plan
Share-based Payment Arrangement
Number of shares authorized (in shares)			5,078,295
2020 Employee Stock Purchase Plan
Share-based Payment Arrangement
Number of shares authorized (in shares)		360,000
Common stock shares available for grant (in shares)					1,554,086
Percentage of automatic annual increase in number of shares		1.00%
Number of additional shares authorized (in shares)	422,820
Maximum aggregate number of shares added to plan (in shares)		3,220,520
Percentage of payroll deductions			15.00%
Discount of shares rate, percent			15.00%
Number of offering periods (period) \| period			2
Share-based payment arrangement, expense \| $			$ 0.0	$ 0.0

Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Share-based Payment Arrangement
Stock-based compensation expense	$ 3,224	$ 4,572
Research and development expenses
Share-based Payment Arrangement
Stock-based compensation expense	1,341	2,039
General and administrative expenses
Share-based Payment Arrangement
Stock-based compensation expense	$ 1,883	$ 2,533

Collaboration Agreements (Details) $ in Thousands	1 Months Ended	3 Months Ended
Collaboration Agreements (Details) $ in Thousands	Dec. 31, 2021 USD ($) target program	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023
Collaborative Arrangement and Arrangement Other than Collaborative
Collaboration revenue		$ 5,050	$ 5,309
Accrued expenses and other current liabilities		6,265		$ 9,108
Eli Lilly
Collaborative Arrangement and Arrangement Other than Collaborative
Number of additional targets \| target	3
Number of programs \| program	6
Number of targets \| target	5
Cost sharing allocation	50.00%				50.00%
Deferred revenue		297,600
Collaboration revenue		5,100	4,700
Accrued expenses and other current liabilities		1,200		1,500
Eli Lilly \| Sales Based Milestone
Collaborative Arrangement and Arrangement Other than Collaborative
Amount receivable for achievement of milestones	$ 180,000
Optout milestone receivable upon achievement	360,000
Eli Lilly \| Maximum \| Research Development And Regulatory
Collaborative Arrangement and Arrangement Other than Collaborative
Amount receivable for achievement of milestones	10,000
Optout milestone receivable upon achievement	$ 70,000
Merck
Collaborative Arrangement and Arrangement Other than Collaborative
Unsatisfied portion of the performance obligation		$ 0		$ 0
Merck \| Merck Collaboration Agreement
Collaborative Arrangement and Arrangement Other than Collaborative
Collaboration revenue			$ 600

Commitments and Contingencies (Details) - Stanford License Agreement - Maximum $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Commitments And Contingencies
Annual license maintenance fees	$ 0.3
Milestones payable upon event	$ 1.1

Related Parties (Details) - USD ($)		1 Months Ended	3 Months Ended
Related Parties (Details) - USD ($)	Dec. 10, 2021	Oct. 31, 2015	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Related Party Transaction
Accounts payable			$ 5,631,000		$ 6,260,000
Revenue			5,050,000	$ 5,309,000
Accrued expenses and other current liabilities			6,265,000		9,108,000
Eli Lilly
Related Party Transaction
Revenue			5,100,000	4,700,000
Accrued expenses and other current liabilities			1,200,000		1,500,000
Related Party \| Eli Lilly
Related Party Transaction
Revenue			1,700,000	$ 0
Accrued expenses and other current liabilities			$ 1,200,000		1,500,000
Related Party \| Eli Lilly \| Share Purchase Agreement
Related Party Transaction
Sale of stock, number of shares issued in transaction (in shares)	4,000,000
Sale of stock issue price per share (in dollars per share)			$ 20.00
Related Party \| Scientific Founder
Related Party Transaction
Service agreement term		5 years
Service agreement, renewal term		1 year
Accounts payable			$ 100,000		$ 100,000