10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

____________________________________________________

FORM 10-Q

____________________________________________________

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

FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2023

OR

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

FOR THE TRANSITION PERIOD FROM _ TO _

COMMISSION FILE NUMBER 001-39044

__________________________________

SPRINGWORKS THERAPEUTICS, INC.

(Exact name of registrant as specified in its charter)

__________________________________

Delaware	83-4066827
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
100 Washington Blvd Stamford, Connecticut	06902
(Address of principal executive offices)	(Zip Code)

(203) 883-9490

(Registrant’s telephone number, including area code)

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

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, par value $0.0001 per share	SWTX	The Nasdaq Global Select 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, a 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	x	Accelerated filer	¨
Non-accelerated filer	¨	Smaller reporting company	¨
		Emerging growth company	¨

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

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

The number of outstanding shares of the Registrant’s Common Stock as of April 28, 2023 was 62,523,060.

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q, or Quarterly Report, contains forward-looking statements that involve risks and uncertainties. We make such forward-looking statements pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995 and other federal securities laws. All statements other than statements of historical facts contained in this Quarterly Report are forward-looking statements. In some cases, these forward-looking statements can be identified by the use of words such as “may”, “will”, “should”, “expects”, “intends”, “plans”, “anticipates”, “believes”, “estimates”, “predicts”, “potential”, “continue” or the negative of these terms or other comparable terminology. These forward-looking statements include, but are not limited to, statements about:

•the success, cost and timing of our product development activities and clinical trials, including the timing of our ongoing Phase 2b clinical trial of mirdametinib and the initiation and completion of any other clinical trials and related preparatory work, the expected timing of the availability of results of our clinical trials and the registrational nature of the Phase 3 clinical trial of nirogacestat and the potentially registrational nature of the Phase 2b clinical trial of mirdametinib;

•the fact that topline or interim data from our clinical studies may not be predictive of the final or more detailed results of such study or the results of other ongoing or future studies;

•the potential attributes and benefits of our product candidates;

•our plans to commercialize any of our product candidates that achieve approval either alone or in partnership with others;

•our ability to obtain funding for our operations, including funding necessary to complete further development of our product candidates, and if approved, commercialization;

•the period over which we anticipate our existing cash, cash equivalents and marketable securities, will be sufficient to fund our operating expenses and capital expenditure requirements;

•the potential for our business development efforts to maximize the potential value of our portfolio;

•our ability to identify, in-license or acquire additional product candidates;

•the ability and willingness of our third-party collaborators to continue research and development activities relating to our product candidates, including those that are being developed as combination therapies;

•our ability to obtain and maintain regulatory approval for our product candidates, and any related restrictions, limitations or warnings in the label of an approved product candidate;

•the timing of our planned regulatory submissions and interactions, including the New Drug Application, or NDA, for mirdametinib planned for submission in the first half of 2024 and the Marketing Authorization Application for nirogacestat with the European Medicines Agency in the European Union in 2024, the timing and outcome of decisions made by the U.S. Food and Drug Administration, or FDA, including the decision on the NDA filing for nirogacestat accepted in February 2023 by the FDA and granted priority review with an assigned Prescription Drug User Fee Act target action date of August 27, 2023, as well as those by other regulatory authorities, investigational review boards at clinical trial sites and publication review bodies;

•the potential benefit of Orphan Drug Designation, Fast Track Designation and Breakthrough Therapy Designation for nirogacestat, mirdametinib and any other of our product candidates that may receive one or more of these designations;

•our ability to compete with companies currently marketing or engaged in the development of treatments for desmoid tumors, NF1-PN and other oncology and rare disease indications;

•our expectations regarding our ability to report topline data for our potentially registrational Phase 2b clinical trial of mirdametinib for patients with NF1-PN in the second half of 2023;

•our expectations regarding our ability to obtain and maintain intellectual property protection or market exclusivity for our product candidates and the duration of such protection;

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•our ability and the potential to successfully manufacture our product candidates for preclinical studies, clinical trials and, if approved, for commercial use, the capacity of our current contract manufacturing organizations, or CMOs, to support clinical supply and commercial-scale production for product candidates and our potential election to pursue additional CMOs for manufacturing supplies of drug substance and finished drug product in the future;

•the size and growth potential of the markets for our product candidates, and our ability to serve those markets, either alone or in partnership with others;

•the rate and degree of market acceptance of our product candidates, if approved;

•regulatory developments in the United States and foreign countries;

•our ability to contract with third-party suppliers and manufacturers and their ability to perform adequately;

•the success of competing products that are, or may become, available;

•risks associated with the ongoing COVID-19 pandemic, which may adversely impact our business, operations, preclinical studies, clinical trials, supply chain, strategy, goals and anticipated timelines;

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

•our estimates regarding expenses, future revenue, capital requirements and needs for additional financing;

•our financial performance; and

•developments and projections relating to our competitors or our industry.

Any forward-looking statements in this Quarterly Report reflect our current views with respect to future events and future financial performance, and involve known and unknown risks, uncertainties and other factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by these forward-looking statements. Factors that may cause actual results to differ materially from current expectations include, among other things, those described under Part II, Item 1A, Risk Factors and elsewhere in this Quarterly Report. Given these uncertainties, you should not place undue reliance on these forward-looking statements. Except as required by law, we assume no obligation to update or revise these forward-looking statements for any reason, even if new information becomes available in the future.

We may from time to time provide estimates, projections and other information concerning our industry, the general business environment, and the markets for certain diseases, including estimates regarding the potential size of those markets and the estimated incidence and prevalence of certain medical conditions. Information that is based on estimates, forecasts, projections, market research or similar methodologies is inherently subject to uncertainties, and actual events, circumstances or numbers, including actual disease prevalence rates and market size, may differ materially from the information provided. Unless otherwise expressly stated, we obtained this industry information, business information, market data, prevalence information and other data from reports, research surveys, studies and similar data prepared by market research firms and other third parties, industry, medical and general publications, government data, and similar sources, in each case, from sources we consider to be reliable, and in some cases applying our own assumptions and analysis that may, in the future, prove not to have been accurate.

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SPRINGWORKS THERAPEUTICS, INC.

FORM 10-Q

FOR THE QUARTER ENDED March 31, 2023

INDEX

	Page
PART I – FINANCIAL INFORMATION
Item 1. Financial Statements (Unaudited)	5
Condensed Consolidated Balance Sheets	5
Condensed Consolidated Statements of Operations	6
Condensed Consolidated Statements of Comprehensive Loss	7
Condensed Consolidated Statements of Stockholders’ Equity	8
Condensed Consolidated Statements of Cash Flows	9
Notes to Condensed Consolidated Financial Statements	10
Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations	18
Item 3. Quantitative and Qualitative Disclosure About Market Risk	24
Item 4. Controls and Procedures	25
PART II. OTHER INFORMATION
Item 1. Legal Proceedings	26
Item 1A. Risk Factors	26
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	28
Item 3. Defaults Upon Senior Securities	28
Item 4. Mine Safety Disclosures	28
Item 5. Other Information	28
Item 6. Exhibits	28
SIGNATURES	30

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PART I - FINANCIAL INFORMATION

Item 1. Financial Statements

SpringWorks Therapeutics, Inc.

Condensed Consolidated Balance Sheets (Unaudited)

	March 31, 2023		December 31, 2022
(in thousands, except share and per-share data)	(Unaudited)
Assets
Current assets:
Cash and cash equivalents	$	102,401	$	67,490
Marketable securities	425,740		524,722
Prepaid expenses and other current assets	9,516		7,548
Total current assets	537,657		599,760
Long-term marketable securities	—		4,794
Property and equipment, net	15,728		13,571
Operating lease right-of-use assets	6,602		4,698
Equity investment	5,714		4,193
Restricted cash	605		578
Other assets	2,891		2,648
Total assets	$	569,197	$	630,242
Liabilities and Stockholders’ equity
Current liabilities:
Accounts payable	$	6,990	$	8,010
Accrued expenses	28,687		39,242
Operating lease liabilities, current	386		483
Deferred revenue, current	1,690		3,314
Total current liabilities	37,753		51,049
Operating lease liabilities, long-term	6,664		4,768
Deferred revenue, long-term	17,856		16,233
Total liabilities	62,273		72,050
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.0001 par value, 10,000,000 shares authorized, no shares issued or outstanding at March 31, 2023 and December 31, 2022.	—		—
Common stock, $0.0001 par value, 150,000,000 shares authorized, 62,623,777 and 62,453,328 shares issued, and 62,523,438 and 62,423,129 shares outstanding at March 31, 2023 and December 31, 2022, respectively.	6		6
Additional paid-in capital	1,153,702		1,130,224
Accumulated deficit	(643,350)		(569,930)
Treasury stock, at cost (100,339 and 30,199 shares of common stock at March 31, 2023 and December 31, 2022, respectively).	(3,272)		(1,341)
Accumulated other comprehensive loss	(162)		(767)
Total stockholders’ equity	506,924		558,192
Total liabilities and stockholders’ equity	$	569,197	$	630,242

See accompanying unaudited notes to condensed consolidated financial statements

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SpringWorks Therapeutics, Inc.

Condensed Consolidated Statements of Operations (Unaudited)

	Three Months Ended March 31,
(in thousands, except share and per-share data)	2023		2022
Operating expenses:
Research and development	$	33,524	$	34,103
General and administrative	44,175		27,366
Total operating expenses	77,699		61,469
Loss from operations	(77,699)		(61,469)
Interest and other income (expense):
Other expense	(199)		(193)
Interest income, net	5,756		198
Total interest and other income	5,557		5
Equity investment loss	(1,278)		(337)
Net loss	$	(73,420)	$	(61,801)
Net loss per share, basic and diluted	$	(1.18)	$	(1.26)
Weighted average common shares outstanding, basic and diluted	62,326,992		48,937,756

See accompanying unaudited notes to condensed consolidated financial statements

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SpringWorks Therapeutics, Inc.

Condensed Consolidated Statements of Comprehensive Loss (Unaudited)

	Three Months Ended March 31,
(in thousands)	2023		2022
Net loss	$	(73,420)	$	(61,801)
Changes in other comprehensive income:
Unrealized gain (loss) on marketable securities, net	605		(1,146)
Total changes in other comprehensive income	$	605	$	(1,146)
Comprehensive loss	$	(72,815)	$	(62,947)

See accompanying unaudited notes to condensed consolidated financial statements

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SpringWorks Therapeutics, Inc.

Condensed Consolidated Statements of Stockholders’ Equity

(Unaudited)

	Three Months Ended March 31, 2023 and March 31, 2022
		Common			Treasury			Additional Paid-In Capital		Accumulated Other Comprehensive Income (Loss)		Accumulated Deficit		Total
(in thousands, except share data)		Shares	Amount		Shares	Amount
Balance at December 31, 2021		49,247,985	$	5	—	$	—	$	715,216	$	(312)	$	(292,513)	$	422,396
Stock-based compensation expense								17,094						17,094
Issuance of restricted stock awards		36,625	—											—
Forfeitures of restricted stock awards		(3,440)												—
Exercise of stock options		142,657						1,167						1,167
Shares of common stock used to satisfy tax withholding obligations					16,210	(906)								(906)
Other comprehensive income (loss), net of tax										(1,146)				(1,146)
Net loss												(61,801)		(61,801)
Balance at March 31, 2022		49,423,827	$	5	16,210	$	(906)	733,477		$	(1,458)	$	(354,314)	$	376,804
Balance at December 31, 2022		62,453,328	$	6	30,199	$	(1,341)	1,130,224		$	(767)	$	(569,930)	$	558,192
Stock-based compensation expense								23,395						23,395
Forfeitures of restricted stock awards		(1,039)	—											—
Restricted stock units vested		140,575	—											—
Exercise of stock options		30,913	—					83						83
Shares of common stock used to satisfy tax withholding obligations					70,140	(1,931)								(1,931)
Other comprehensive income, net of tax										605				605
Net Loss												(73,420)		(73,420)
Balance at March 31, 2023		62,623,777	$	6	100,339	$	(3,272)	$	1,153,702	$	(162)	$	(643,350)	$	506,924

See accompanying unaudited notes to condensed consolidated financial statements

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SpringWorks Therapeutics, Inc.

Condensed Consolidated Statements of Cash Flows

(Unaudited)

	Three Months Ended March 31,
(in thousands)	2023		2022
Operating activities
Net loss	$	(73,420)	$	(61,801)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	253		108
Non-cash operating lease expense	286		272
Stock compensation expense	23,395		17,094
Equity investment loss	1,278		337
Changes in operating assets and liabilities
Prepaid expenses and other current assets	(1,968)		1,729
Other assets	(243)		82
Accounts payable	(753)		(1,770)
Accrued expenses	(10,255)		(4,695)
Lease liability	(391)		(44)
Net cash used in operating activities	$	(61,818)	$	(48,688)
Investing activities
Capital expenditures	(2,977)		(2,387)
Equity investment	(2,800)		—
Purchases of marketable securities	(68,148)		(23,242)
Proceeds from sale and maturity of debt securities	172,529		52,053
Net cash provided by investing activities	$	98,604	$	26,424
Financing activities
Treasury stock	(1,931)		(906)
Proceeds from stock option exercises	83		1,167
Net cash (used in) provided by financing activities	$	(1,848)	$	261
Net increase (decrease) in cash and cash equivalents	34,938		(22,003)
Cash and cash equivalents including Restricted cash, beginning of period	68,068		104,526
Cash and cash equivalents including Restricted cash, end of period	$	103,006	$	82,523

Non-cash investing activities
Right-of-use assets obtained in exchange for operating lease obligations	$	2,136	$	5,580

See accompanying unaudited notes to condensed consolidated financial statements

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SpringWorks Therapeutics, Inc.

Notes to Condensed Consolidated Financial Statements (Unaudited)

1. Nature of Operations

SpringWorks Therapeutics, Inc., together with its wholly-owned subsidiaries, collectively, the Company, is a clinical-stage biopharmaceutical company applying a precision medicine approach to acquiring, developing and commercializing life-changing medicines for underserved patient populations suffering from devastating rare diseases and cancer. The Company has a differentiated portfolio of small molecule targeted oncology product candidates and is advancing programs in both rare tumor types as well as highly prevalent, genetically defined cancers. Two of the programs are late-stage clinical product candidates: nirogacestat and mirdametinib. In December 2022, the Company submitted a New Drug Application, or NDA, to the U.S. Food and Drug Administration, or FDA, for nirogacestat for the treatment of adults with desmoid tumors. In February 2023, the NDA filing was accepted by the FDA and granted priority review with an assigned Prescription Drug User Fee Act, or PDUFA, target action date of August 27, 2023.

The Company has incurred losses and negative operating cash flows since inception and had an accumulated deficit of $643.4 million and $569.9 million, and working capital of $499.9 million and $548.7 million, as of March 31, 2023 and December 31, 2022, respectively. The Company is subject to those risks associated with any biopharmaceutical company that has substantial expenditures for development. There can be no assurance that the Company’s development projects will be successful, that products developed will obtain necessary regulatory approval, or that any approved product will be commercially viable. In addition, the Company operates in an environment of rapid technological change and is largely dependent on the services of its employees, advisors, consultants and vendors.

The Company had cash, cash equivalents and marketable securities of $528.1 million and $597.0 million as of March 31, 2023 and December 31, 2022, respectively. Based on the Company's cash, cash equivalents and marketable securities as of March 31, 2023, management estimates that its current liquidity will enable it to meet operating expenses through at least twelve months after the date that these financial statements are issued.

COVID-19 Pandemic

Coronavirus, or COVID-19, including emerging variant strains of COVID-19, has continued to spread in the areas in which the Company operates. The Company's response has evolved over the course of the ongoing COVID-19 pandemic, and the Company has largely resumed normal operations. In the United States, the government has announced a plan for the expiration of the federal Public Health Emergency and national emergency declarations for COVID-19 in May 2023. During the periods presented, the Company did not experience any material disruptions to the execution of research and development or commercialization preparation activities; however, as a result of the COVID-19 pandemic, or any impacts of emerging variant strains of the COVID-19 virus, stagnant vaccination rates and related factors, the Company may experience disruptions that could impact its research and development and commercialization timelines and outcomes. The Company will continue to evaluate the impact of the ongoing COVID-19 pandemic, along with the impact of emerging variants, on its business. While the extent to which the ongoing COVID-19 pandemic impacts the Company’s future results will depend on future developments, the pandemic and associated impacts, including the duration, spread and intensity of the pandemic (including any resurgences), the impact of emerging variant strains of the COVID-19 virus and the rollout of COVID-19 vaccines, all of which remain uncertain and difficult to predict, could result in a material impact to the Company’s business, prospects, future financial condition, results of operations and cash flows.

2. Basis of Presentation

The Company’s unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States, or U.S. GAAP, for interim financial information and Article 10 of Regulation S-X of the Securities and Exchange Commission, or SEC, and should be read in conjunction with the Company's consolidated financial statements and notes thereto contained in the Company's Annual Report on Form 10-K for the year ended December 31, 2022, filed with the SEC on February 28, 2023. The condensed consolidated financial statements presented in this Quarterly Report on Form 10-Q are unaudited; however, in the opinion of management, such financial statements reflect all adjustments, consisting solely of normal recurring adjustments, necessary for a fair presentation of the results for the interim periods presented.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts in the financial statements and accompanying notes. Estimates and assumptions

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reflected in these condensed consolidated financial statements include, but are not limited to, research and development expenses and the valuation of stock-based compensation awards. Management bases its estimates on historical experience, known trends and other market-specific or relevant factors that it believes to be reasonable under the circumstances. Actual results may differ from those estimates or assumptions. On an ongoing basis, management evaluates its estimates, and adjusts those estimates and assumptions when facts or circumstances change. Changes in estimates are recorded in the period in which they become known.

Research and Development Expenses

In accordance with ASC 730, “Research and Development”, expenditures for clinical development, including upfront licensing fees and milestone payments associated with products that have not yet been approved by the FDA, are charged to research and development expense as incurred. These expenses consist of expenses incurred in performing development activities, including salaries and benefits, stock-based compensation expense, preclinical expenses, clinical trial and related clinical manufacturing expenses, contract services and other outside expenses. Expenses incurred for certain research and development activities, including expenses associated with particular activities performed by contract research organizations, investigative sites in connection with clinical trials and contract manufacturing organizations, are recognized based on an evaluation of the progress or completion of specific tasks using either time-based measures or data such as information provided to the Company by its vendors on actual activities completed or costs incurred. Payments for these activities are based on the terms of the individual arrangements, which may differ from the pattern of expense recognition. Expenses for research and development activities incurred that have yet to be invoiced by the vendors that perform the related activities are recorded as accrued research and development expenses. Advance payments for goods or services to be received in the future for research and development activities are deferred and capitalized. The capitalized amounts are expensed as the related goods are delivered or the services are performed.

Segment Information

Operating segments are defined as components of an entity about which separate discrete information is available for evaluation by the chief operating decision maker, or decision-making group, in deciding how to allocate resources and in assessing performance. The Company views its operations and manages its business in one operating segment operating exclusively in the United States.

Recently Adopted Accounting Pronouncements

There were no recently adopted accounting pronouncements that had a material impact on the Company's financial statements, and no recently issued accounting pronouncements that are expected to have a material impact on the Company's financial statements.

3. Marketable Securities

The following table summarizes the Company’s available-for-sale marketable securities as of March 31, 2023 and December 31, 2022:

	As of March 31, 2023
(in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Marketable securities:
Short-term investments:
U.S. government securities	$	197,173	$	—	$	(96)	$	197,077
Non-U.S. government securities	1,996		—		(5)		1,991
Corporate debt securities	39,140		—		(61)		39,079
Commercial paper	187,593		—		—		187,593
Total	$	425,902	$	—	$	(162)	$	425,740

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	As of December 31, 2022
(in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Marketable securities:
Short-term investments:
U.S. government securities	$	232,229	$	—	$	(690)	$	231,539
Non-U.S. government securities	9,388		—		(31)		9,357
Corporate debt securities	45,710		—		(44)		45,666
Commercial paper	238,160		—		—		238,160
Long-term investments:
Corporate debt securities	4,796		—		(2)		4,794
Total	$	530,283	$	—	$	(767)	$	529,516

The Company’s marketable securities are available-for-sale securities and consist of high-quality, highly liquid debt securities including corporate debt securities, U.S. government securities, non-U.S. government securities, and commercial paper.

The Company’s securities classified as short-term marketable securities mature within one year or less of the balance sheet date. Marketable securities that mature greater than one year from the balance sheet date are classified as long-term. As of March 31, 2023, the Company did not hold any investments with maturity dates greater than five years.

As of, and for the three months ended March 31, 2023, the Company did not have any allowance for credit losses or impairments of its marketable securities.

4. Fair Value Measurements

The fair value of the Company’s financial assets measured on a recurring basis are classified based upon a fair value hierarchy consisting of the following three levels:

Level 1 — Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets, or liabilities.

Level 2 — Quoted prices for similar assets and liabilities in active markets, quoted prices in markets that are not active, or inputs which are observable, either directly or indirectly, for substantially the full term of the instrument.

Level 3 — Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity).

The fair value hierarchy is based on inputs to valuation techniques used to measure fair value that are either observable or unobservable. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity's pricing based upon their own market assumptions.

As of March 31, 2023 and December 31, 2022, the Company's financial assets and liabilities measured at fair value on a recurring basis consisted of the following:

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	As of March 31, 2023
			Fair Value Hierarchy
(in thousands)	Total		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	39,780	$	39,780	$	—	$	—
Corporate debt securities	—		—		—		—
Short-term investments:
U.S. government securities	197,076		197,076		—		—
Non-U.S. government securities	1,991		—		1,991		—
Corporate debt securities	39,079		—		39,079		—
Commercial paper	187,593		—		187,593		—
Total	$	465,519	$	236,856	$	228,663	$	—

	As of December 31, 2022
			Fair Value Hierarchy
(in thousands)	Total		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	22,494	$	22,494	$	—	$	—
Corporate debt securities	—		—		—		—
Short-term investments:
U.S. government securities	231,539		231,539		—		—
Non-U.S. government securities	9,357		—		9,357		—
Corporate debt securities	45,666		—		45,666		—
Commercial paper	238,160		—		238,160		—
Long-term investments:
Corporate debt securities	4,794		—		4,794		—
Total	$	552,010	$	254,033	$	297,977	$	—

As of March 31, 2023 and December 31, 2022, the Company’s financial assets measured at fair value on a recurring basis using a market approach included cash equivalents, which consist of money market funds, and marketable securities, which consist of high-quality, highly liquid available-for-sale debt securities including corporate debt securities, U.S. government securities, non-U.S. government securities, and commercial paper.

The Company’s money market funds are readily convertible into cash and the net asset value of each fund on the last day of the quarter is used to determine fair value. The U.S. government securities are classified as Level 1 and valued utilizing quoted market prices. The Company’s corporate debt securities, non-U.S. government securities, and commercial paper are classified as Level 2 and valued utilizing various market and industry inputs.

The Company considers all highly liquid instruments that have maturities of three months or less when acquired to be cash equivalents. The carrying amounts for cash equivalents, accounts payable, and accrued expenses approximate fair value due to their short-term maturities.

5. Collaboration, Licensing and Variable Interest Entities

MapKure

In June 2019, the Company announced the formation of MapKure LLC, or MapKure, an entity jointly owned by the Company and BeiGene Ltd., or BeiGene. BeiGene licensed to MapKure exclusive rights to brimarefenib (BGB-3245), an investigational oral, small molecule selective inhibitor of specific BRAF driver mutations and genetic fusions. MapKure is advancing brimarefenib through clinical development for solid tumor patients harboring BRAF driver mutations and genetic fusions that were observed to be sensitive to the compound in preclinical studies. In addition to the Company’s equity ownership in MapKure, the Company maintains a member on each of MapKure’s joint steering committee and board of directors. The

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Company also contributes to clinical development and other operational activities for brimarefenib through a service agreement with MapKure.

In conjunction with the formation of MapKure in June 2019, the Company purchased 3,500,000 Series A preferred units of MapKure, or a 25.0% ownership interest, for $3.5 million and in June 2020, the Company purchased an additional 3,500,000 Series A preferred units of MapKure for $3.5 million, increasing its ownership interest to 38.9%, as required by the terms of the Series A unit purchase agreement.

In June 2022, the Company made an additional investment in MapKure and purchased 4,200,000 Series B preferred units of MapKure for $4.2 million, pursuant to the terms of a Series B preferred unit purchase agreement. In January 2023, pursuant to terms of the Series B preferred unit purchase agreement, the Company purchased an additional 2,800,000 Series B preferred units of MapKure for $2.8 million. As of March 31, 2023, the Company’s ownership interest in MapKure was 38.9%.

The Company determined that MapKure is a variable interest entity. The Company is not the primary beneficiary, as the Company does not have the power to direct the activities that most significantly impact the economic performance of MapKure. Accordingly, the Company does not consolidate the financial statements of this entity and accounts for this investment using the equity method of accounting based on a one quarter lag.

The Company recognized an equity loss of $1.3 million and $0.3 million for the three month periods ended March 31, 2023 and March 31, 2022, respectively. The Company’s ownership interest in MapKure is included in Equity method investments. The balance of the Company’s investment was $5.7 million as of March 31, 2023, representing the maximum exposure to loss as a result of the Company’s involvement with MapKure.

GSK Expanded Non-exclusive License and Collaboration Agreement

In September 2022, the Company announced an expansion of its ongoing, non-exclusive clinical collaboration with GSK plc, formerly GlaxoSmithKline plc, or GSK, which originally commenced in June 2019. The announcement coincided with the entry by the Company and GSK into an amended and restated collaboration and license agreement, or the GSK License Agreement, for the potential continued development and commercialization of nirogacestat in combination with either belantamab mafodotin (belamaf), GSK’s antibody-drug conjugate, or ADC, targeting B-cell maturation antigen, or BCMA, or any other cytotoxic ADC targeting BCMA derived from belantamab that is controlled by GSK, either alone as a combination therapy, or together with other pharmaceutical agents.

Pursuant to the terms of the GSK License Agreement and concurrent with the execution of such agreement, the Company entered into a Stock Purchase Agreement with GGL, under which GGL purchased 2,050,819 shares of the Company’s Common Stock, par value $0.0001 per share, or Common Stock, in a private placement transaction for an aggregate purchase price of approximately $75.0 million, or $36.57 per share. The shares were sold at a 25% premium to the volume-weighted average share price of the Common Stock for a specified 30-day period prior to entering into the Stock Purchase Agreement. The fair value of the Common Stock based on the closing price of Common Stock on the day prior to the effective date of the Stock Purchase Agreement was $55.5 million and was recorded to equity. The $19.5 million of consideration received in excess of the fair value of the Common Stock represents consideration for the license for the potential continued development and commercialization of nirogacestat in combination with GSK compounds, together with the clinical supply of nirogacestat for future belamaf clinical trials and certain research and development costs associated with nirogacestat. The Company recorded the $19.5 million as deferred revenue in September of 2022 and will recognize revenue as the corresponding performance obligation is satisfied in proportion to expenses incurred, including clinical supply and research and development expenses, associated with the GSK License Agreement. For the three month period ended March 31, 2023, the revenue related to the upfront consideration received from the GSK License Agreement is insignificant.

6. Accrued Expenses

Accrued expenses consists of the following:

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	March 31,		December 31,
(in thousands)	2023		2022
Accrued professional fees	$	1,525	$	1,780
Accrued compensation and benefits	9,133		19,142
Accrued research and development	12,009		12,321
Accrued other	6,020		5,999
Total accrued expenses	$	28,687	$	39,242

7. Commitments and Contingencies

The Company enters into contracts in the normal course of business for clinical trials, preclinical studies, manufacturing and other services and products for operating purposes. These contracts generally provide for termination following a certain period after notice and therefore the Company believes that non-cancelable obligations under these agreements are not material.

Additionally, the Company has excluded milestone or royalty payments or other contractual payment obligations as the timing and amounts of such obligations are unknown or uncertain.

Leases

In October 2018, the Company entered into a lease for its corporate headquarters in Stamford, CT. In January 2022, the Company amended this lease agreement to extend the lease term through April 2028, with two five-year renewal options or one ten-year renewal option. Pursuant to the amendment, the Company is entitled to $0.5 million in tenant allowances, which may be used to offset certain future capital expenditures, and the lease payments increase by 2.5% in each year commencing December 1, 2022. The amendment was treated as a modification and the lease liability and Operating lease right-of-use asset were updated to reflect minimum lease payments and any other adjustments.

In March 2023, the Company entered into a five-year operating lease in Research Triangle Park in Durham, NC (the location of the Company’s discovery lab and translational operations), with two consecutive five-year renewal options. The lease payments increase by 3.0% in each of the subsequent four years of the five-year operating lease term. Rental payments under the renewal period will be at current market rates for the premises.

As of March 31, 2023, future lease payments under non-cancelable leases with terms greater than one year are as follows:

(in thousands)	Operating Leases
2023	$	418
2024	1,759
2025	1,806
2026	1,854
2027 and thereafter	2,550
Total lease payments	8,387
Less: imputed interest	(1,337)
Present value of lease liabilities	$	7,050

Contingencies

From time to time, the Company may be involved in disputes or regulatory inquiries that arise in the ordinary course of business. When the Company determines that a loss is both probable and reasonably estimable, a liability is recorded and disclosed if the amount is material to the financial statements taken as a whole. When a material loss contingency is only reasonably possible, the Company does not record a liability, but instead discloses the nature and the amount of the claim, and an estimate of the loss or range of loss, if such an estimate can reasonably be made.

As of March 31, 2023, there was no litigation or contingency with at least a reasonable possibility of a material loss.

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8. Stock-Based Compensation

2019 Equity Incentive Plan

The Company's 2019 Stock Option and Incentive Plan, or 2019 Equity Incentive Plan, provides for the grant of incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock units, restricted stock awards, unrestricted stock awards and dividend equivalent rights to the Company’s officers, employees, directors and other key persons (including consultants). The number of shares available for issuance under the 2019 Equity Incentive Plan is cumulatively increased each January 1, through and including January 1, 2030, by 5% of the number of shares of the Company’s common stock outstanding on the immediately preceding December 31 or such lesser number of shares determined by the Company’s compensation committee.

As of March 31, 2023, there were 4,332,038 shares available for issuance in connection with future awards under the 2019 Equity Incentive Plan.

Stock-Based Awards

During the three months ended March 31, 2023, the Company granted 2,496,476 stock option awards to its officers, employees and directors under the 2019 Equity Incentive Plan.

During the three months ended March 31, 2023, the Company awarded 1,175,681 restricted stock units to its officers, employees and directors under the 2019 Equity Incentive Plan.

During the three months ended March 31, 2023, 55,417 restricted stock awards previously issued to employees of the Company were released, 140,575 restricted stock units vested and 30,913 stock options were exercised. As of March 31, 2023, there were 4,926,147 stock options vested and exercisable.

In June 2019, the Company’s Chief Executive Officer, or CEO, received an award of 176,411 stock options, or the 2019 CEO Performance Award. During the quarter ended March 31, 2023, 11,025 options of the 2019 CEO Performance Award became exercisable upon the satisfaction of the market condition applicable to this award.

Performance Stock Units

On January 5, 2023, the CEO was granted a supplemental equity award consisting of performance-based restricted stock units, or a Performance Based RSU. The Performance-Based RSU covers a target of 284,362 shares common stock and vests over a four year performance period subject but not limited to the achievement of certain regulatory milestones and the CEO’s continued service with the Company. In addition, the target number of shares of common stock covered is subject to modification (upwards or downwards) by up to 25% based upon the relative total shareholder return of the Company’s shares compared to the NASDAQ Biotech Index as of the end of the performance period.

Stock-based compensation expense included in the condensed consolidated statements of operations for each of the periods presented is as follows:

	Three Months Ended March 31,
(in thousands)	2023		2022
Research and development	$	8,918	$	7,072
General and administrative	14,477		10,022
Total stock-based compensation expense	$	23,395	$	17,094

As of March 31, 2023, the unrecognized compensation expense related to unvested stock options, restricted stock units and restricted stock awards was $168.9 million, $43.8 million and $8.8 million, respectively, which is expected to be recognized over a weighted-average remaining period of approximately 2.85, 2.51 years and 1.29 years, respectively.

As of March 31, 2023, the Company had 11,619,559 stock options outstanding, 1,703,188 unvested restricted stock units and 165,303 unvested restricted stock awards.

9. Net Loss per Share

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Since the Company had a net loss in each of the periods presented, basic and diluted net loss per share are the same. The table below provides potentially dilutive securities not included in the computation of the diluted net loss per share for the periods ended March 31, 2023 and March 31, 2022, because to do so would be anti-dilutive:

	As of March 31,
	2023	2022
Common stock options issued and outstanding	11,619,559	7,832,865
Restricted stock units subject to future vesting	1,703,188	459,614
Restricted stock awards subject to future vesting	165,303	398,510
Total potentially dilutive securities	13,488,050	8,690,989

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

The following discussion and analysis of the financial condition and results of operations of SpringWorks Therapeutics, Inc. should be read in conjunction with the condensed consolidated financial statements and the related notes thereto included elsewhere in this Quarterly Report on Form 10-Q, or Quarterly Report, and our consolidated financial statements and notes thereto contained in the Company's Annual Report on Form 10-K for the year ended December 31, 2022, or 2022 Form 10-K, filed with the Securities and Exchange Commission, or SEC, on February 28, 2023. Unless the context otherwise requires, all references to "we," "us," "our," "SpringWorks," or the "Company" refer to SpringWorks Therapeutics, Inc., together with its subsidiaries. This discussion and analysis contains forward-looking statements based upon current expectations that involve risks and uncertainties. We caution you that forward-looking statements are not guarantees of future performance, and that our actual results of operations, financial condition and liquidity, and the developments in our business and the industry in which we operate, may differ materially from the results discussed or projected in the forward-looking statements contained in this Quarterly Report. We discuss risks and other factors that we believe could cause or contribute to these potential differences elsewhere in this Quarterly Report, including under Item 1A. “Risk Factors” and under “Special Note Regarding Forward-Looking Statements”. In addition, even if our results of operations, financial condition and liquidity, and the developments in our business and the industry in which we operate are consistent with the forward-looking statements contained in this Quarterly Report, they may not be predictive of results or developments in future periods. We caution readers not to place undue reliance on any forward-looking statements made by us, which speak only as of the date they are made. We disclaim any obligation, except as specifically required by law and the rules of the Securities and Exchange Commission, or SEC, to publicly update or revise any such statements to reflect any change in our expectations or in events, conditions or circumstances on which any such statements may be based, or that may affect the likelihood that actual results will differ from those set forth in the forward-looking statements.

Overview

We are a clinical-stage biopharmaceutical company applying a precision medicine approach to acquiring, developing and commercializing life-changing medicines for underserved patient populations suffering from devastating rare diseases and cancer. We have a differentiated portfolio of small molecule targeted oncology product candidates and are advancing programs in both rare tumor types as well as highly prevalent, genetically defined cancers. Our strategic approach and operational excellence across research, translational science, and clinical development have enabled us to rapidly advance our two lead product candidates into late-stage clinical trials and generate clinical data to support a regulatory filing for our lead product candidate. We have also entered into multiple shared-value partnerships with industry leaders to expand our portfolio. From this foundation, we are continuing to build a differentiated fully-integrated biopharmaceutical company intensely focused on understanding patients and their diseases in order to develop transformative targeted medicines.

Our most advanced product candidate, nirogacestat, is an investigational oral, small molecule gamma secretase inhibitor, or GSI, in development as a monotherapy for the treatment of desmoid tumors, a rare and often debilitating and disfiguring soft tissue tumor for which there are currently no therapies approved by the FDA. In December 2022, we submitted an NDA to the FDA for nirogacestat for the treatment of adults with desmoid tumors. On February 27, 2023, we announced that the FDA accepted the NDA filing and granted priority review. The FDA has assigned a PDUFA target action date of August 27, 2023. The NDA submission is being reviewed under the FDA’s Real-Time Oncology Review program and is supported by positive data from the Phase 3 DeFi trial, a global, randomized, double-blind, placebo-controlled trial in adult patients with desmoid tumors. In May 2022, we announced positive topline results from the Phase 3 DeFi trial, and we presented additional data from the trial at the European Society for Medical Oncology Congress in September 2022. Results from our Phase 3 DeFi trial were also published in the New England Journal of Medicine in March 2023. The Phase 3 DeFi trial met its primary endpoint of improving progression-free survival, or PFS, demonstrating a statistically significant improvement for nirogacestat over placebo, with a 71% reduction in the risk of disease progression (hazard ratio (HR) = 0.29 (95% CI: 0.15, 0.55); p < 0.001). Nirogacestat also demonstrated statistically significant and clinically meaningful improvements in objective response rate and in patient-reported outcomes, or PROs, all of which were prespecified secondary endpoints of the study. In addition, nirogacestat exhibited a manageable safety profile in the Phase 3 DeFi trial, with 95% of all treatment-emergent adverse events, or TEAEs, reported as Grade 1 or 2. The most frequently reported TEAEs in participants receiving nirogacestat were diarrhea, nausea, and fatigue. In addition, events of ovarian dysfunction, which was defined by investigator-reported events of amenorrhea, premature menopause, menopause, and ovarian failure, and which was observed in 75% of women of childbearing potential receiving nirogacestat, resolved in 74% of the affected participants. The FDA has granted Fast Track and Breakthrough Therapy designations to nirogacestat for the treatment of adult patients with progressive, unresectable, recurrent or refractory desmoid tumors or deep fibromatosis. Nirogacestat has also received Orphan Drug designation from the FDA for the treatment of desmoid tumors and from the European Commission for the treatment of soft tissue sarcoma.

We are actively engaged in commercial preparations to support the potential U.S. launch of nirogacestat, if approved, for the treatment of adults with desmoid tumors. We also expect to file a Marketing Authorization Application, or MAA, with the European Medicines Agency in the European Union in 2024.

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We are also evaluating nirogacestat for the treatment of ovarian granulosa cell tumors, or GCT, a subtype of ovarian cancer. In September 2022, we announced that the first patient had been dosed in an ongoing Phase 2 trial evaluating nirogacestat as a monotherapy in patients with recurrent ovarian GCT.

Our second product candidate is mirdametinib, an investigational oral, small molecule MEK inhibitor currently in development for the treatment of neurofibromatosis type 1-associated plexiform neurofibromas, or NF1-PN, a rare tumor of the peripheral nerve sheath that causes significant pain and disfigurement. We believe that mirdametinib has the potential to offer a best-in-class profile in order to enable the long-term treatment required for this patient population, as compared to other MEK inhibitors. The FDA has granted mirdametinib both Orphan Drug Designation and Fast Track Designation for NF1-PN, and the European Commission has granted mirdametinib Orphan Drug Designation for NF1. In November 2021, we announced full enrollment of the ReNeu trial, a potentially registrational Phase 2b clinical trial of mirdametinib for pediatric and adult patients with NF1-PN, and we expect to report topline data for the ReNeu trial in the second half of 2023.

In hematologic malignancies, we are evaluating novel combination regimens of nirogacestat alongside B-cell maturation antigen, or BCMA, directed therapies for the treatment of multiple myeloma. We have entered into several clinical collaboration agreements with industry partners to evaluate nirogacestat in combination with several different BCMA-directed therapies. In addition to our industry collaborations, we are working with the Fred Hutchinson Cancer Research Center and Dana-Farber Cancer Institute to further explore nirogacestat’s ability to potentiate BCMA-directed therapies as part of sponsored research agreements.

In genetically defined metastatic solid tumors, our current clinical-stage efforts center on the mitogen activated protein kinase, or MAPK, pathway. We are evaluating mirdametinib for the treatment of solid tumors harboring MAPK aberrations in both monotherapy and combination approaches. In collaboration with BeiGene, Ltd., or BeiGene, we are exploring the combination of mirdametinib with BeiGene’s lifirafenib in RAS mutated and other MAPK aberrant cancers. In addition, we are exploring the use of brimarefenib (BGB-3245) in a distinct set of genetically defined BRAF mutated tumors via MapKure, LLC, or MapKure, an entity jointly owned by us and BeiGene. In April 2023, we presented clinical data from both the ongoing Phase 1b trial evaluating mirdametinib in combination with lifirafenib in patients with advanced or refractory solid tumors with RAS mutations, RAF mutations and other MAPK pathway aberrations and the ongoing Phase 1a/1b trial evaluating brimarefenib in patients with advanced or refractory solid tumors harboring MAPK pathway aberrations at the American Association for Cancer Research (AACR) Annual Meeting. These clinical data showed manageable safety profiles and clinical activity in various solid tumors with MAPK pathway aberrations. Dose expansion studies are currently planned or ongoing for each program. In February 2023, the first patient was dosed in a Phase 1/2a open-label, dose escalation and expansion trial evaluating mirdametinib in combination with brimarefenib in patients with advanced solid tumors harboring MAPK mutations. In academic-sponsored studies supported by SpringWorks, mirdametinib is being evaluated for the treatment of low-grade gliomas in children and young adults and other advanced solid tumors harboring various MAPK-activating mutations.

Furthermore, we intend to continue to build our portfolio with assets that have strong biological rationales and validated mechanisms of action, such as the TEA Domain, or TEAD, inhibitor program that we in-licensed from Katholieke Universiteit Leuven and the Flanders Institute for Biotechnology, and the portfolio of epidermal growth factor receptor small molecule inhibitors that we in-licensed from Dana-Farber Cancer Institute. In the fourth quarter of 2022, we nominated a TEAD inhibitor development candidate, SW-682, and we plan to file an Investigational NDA for SW-682 in 2023. We continue to invest in our R&D infrastructure to support both our drug discovery capabilities and our translational medicine activities for development programs.

We plan to continue using shared-value partnerships to maximize the potential of our therapies to serve patients. We have invested in building leading preclinical, clinical, medical and commercial capabilities and have focused on structuring innovative partnerships that seek to align incentives and optimize business outcomes for each party involved. We believe that this approach will continue to allow us to expand our collaborative relationships with innovators, maximize the potential of our existing and future portfolio, and support the building of a scalable and sustainable business focused on the efficient advancement and commercialization of product candidates that hold the potential to transform the lives of oncology patients.

COVID-19 Impact

The ongoing COVID-19 pandemic, including emerging variant strains of COVID-19, continues to spread in the areas in which we operate. In the United States, the government has announced a plan for the expiration of the federal Public Health Emergency and national emergency declarations for COVID-19 in May 2023. Our response has evolved over the course of the ongoing COVID-19 pandemic, and we have largely resumed normal operations. To date, we have not experienced any material disruptions to the execution of the research and development activities that we currently have underway; however, as a result of the COVID-19 pandemic, or any impacts of emerging variant strains of the COVID-19 virus, stagnant vaccination rates and related factors, we may experience disruptions that could impact our research and development and commercialization timelines and outcomes. We will continue to evaluate the impact of the ongoing COVID-19 pandemic, along with the impact of

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emerging variants, on our business. While the extent to which the ongoing COVID-19 pandemic impacts our future results will depend on future developments, the pandemic and associated impacts, including the duration, spread and intensity of the pandemic (including any resurgences), the impact of emerging variant strains of the COVID-19 virus and the rollout of COVID-19 vaccines, all of which remain uncertain and difficult to predict, could result in a material impact to our business, prospects, future financial condition, results of operations and cash flows.

Components of our results of operations

Revenue

We have not generated any commercial revenue from the sale of products. If our development efforts for our current product candidates or additional product candidates that we may develop in the future are successful and can be commercialized, we may generate revenue in the future from product sales. We may enter into collaboration and license agreements from time to time that provide for certain payments due to us. Accordingly, we may generate revenue from such collaboration and/or license agreements in the future.

Operating expenses

Research and development expenses

Our research and development expenses consist of expenses incurred in connection with the development of our product candidates. These expenses include:

•employee-related expenses, which include salaries, benefits and stock-based compensation for our research and development personnel;

•fees paid to consultants for services directly related to our research and development programs;

•expenses incurred under agreements with third-party contract research organizations, or CROs, investigative clinical trial sites, academic institutions and consultants that conduct research and development activities on our behalf or in collaboration with us;

•costs associated with preclinical studies and clinical trials;

•costs associated with the manufacture of drug substance and finished drug product for preclinical testing and clinical trials;

•costs associated with technology and intellectual property licenses; and

•an allocated portion of facilities and facility-related costs, which include expenses for rent and other facility-related costs and other supplies.

External costs for research and development expenses are tracked on a program-by-program basis. Expenditures for clinical development, including upfront licensing fees and milestone payments associated with our product candidates, are charged to research and development expense as incurred. These expenses consist of expenses incurred in performing development activities, including salaries and benefits, materials and supplies, preclinical expenses, clinical trial and related clinical manufacturing expenses, depreciation of equipment, contract services and other outside expenses. Costs for certain development activities, such as manufacturing and clinical trials, are recognized based on an evaluation of the progress to completion of specific tasks using either time-based measures or data such as information provided to us by our vendors on actual activities completed or costs incurred.

We expect our research and development expenses to increase for the foreseeable future as we continue to invest in activities related to developing our product candidates and our preclinical programs, and as certain product candidates advance into later stages of development, including nirogacestat, for which we submitted an NDA in December 2022, and the ReNeu trial. The process of conducting the necessary clinical trials to obtain regulatory approval is costly and time-consuming, and the successful development of our product candidates is highly uncertain. As a result, we are unable to determine the duration and completion costs of our research and development projects or when and to what extent we will generate revenue from the commercialization and sale of any of our product candidates.

General and administrative expenses

General and administrative expenses consist primarily of salaries and related costs, including stock-based compensation, for personnel in executive, finance, corporate, commercial, business development and administrative functions. General and administrative expenses also include: commercial readiness activities; legal fees relating to patent and corporate matters; professional fees for accounting, auditing, tax and administrative consulting services; insurance costs; administrative travel

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expenses; and facility-related expenses, which include direct depreciation costs and allocated expenses for rent and maintenance of facilities and other operating costs.

We anticipate that our general and administrative expenses will increase in the future as we increase our headcount to support the continued development of our product candidates and expand operations to support the organization, including commercialization of our product candidates.

Interest and other income

Interest and other income consists primarily of interest income. Interest income consists of interest earned on our cash, cash equivalents and available-for-sale marketable securities.

Equity investment loss

The equity investment loss represents our share of losses from the MapKure investment, which is accounted for using the equity method of accounting.

Results of Operations

Comparison of the three months ended March 31, 2023 and March 31, 2022

The following table summarizes our results of operations for the three months ended March 31, 2023 and March 31, 2022:

	Three Months Ended March 31,
(in thousands)	2023		2022		$ Change		% Change
Operating expenses:
Research and development	$	33,524	$	34,103	$	(579)	(2)	%
General and administrative	44,175		27,366		16,809		61	%
Total operating expenses	77,699		61,469		16,230		26	%
Loss from operations	(77,699)		(61,469)		(16,230)		26	%
Interest and other income (expense):
Other expense	(199)		(193)		(6)		3	%
Interest income, net	5,756		198		5,558		2,807	%
Total interest and other income	$	5,557	$	5	$	5,552	111,040	%
Equity investment loss	(1,278)		(337)		(941)		279	%
Net loss	$	(73,420)	$	(61,801)	$	(11,619)	19	%

Research and Development

Research and development expense decreased by $0.6 million to $33.5 million for the three months ended March 31, 2023 from $34.1 million for the three months ended March 31, 2022, a decrease of 2%.

The decrease in research and development expense was primarily attributable to a decrease of $3.8 million in external costs related to drug manufacturing, clinical trial and other research, as well as facility-related costs, offset by an increase of $3.3 million in internal costs driven by the growth in employee costs associated with increases in the number of personnel, including an increase in stock-based compensation expense.

General and Administrative

General and administrative expense increased by $16.8 million to $44.2 million for the three months ended March 31, 2023 from $27.4 million for the three months ended March 31, 2022, an increase of 61%.

The increase in general and administrative expense was largely attributable to commercial readiness activities to support the potential U.S. launch of nirogacestat, if approved, for the treatment of adults with desmoid tumors. The increase in general and administrative expense included a $9.1 million increase in internal costs and a $7.7 million increase in consulting and professional services. The increase in internal costs was attributable to the growth in employee costs associated with increases

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in the number of personnel, including an increase in stock-based compensation expense, driven by the growth of our commercial organization, which included establishing certain sales, marketing, and commercialization functions. The increase in consulting and professional services was also primarily attributable to commercial readiness activities as we expand the capabilities of the organization.

Interest and Other Income

The increase in interest and other income was driven by an increase in interest income, net, for the three months ended March 31, 2023 as compared to the three months ended March 31, 2022. This increase was attributable to higher market yield and increased cash from financing activities during the year ended December 31, 2022.

Liquidity and Capital Resources

Sources of Liquidity

We have incurred operating losses and experienced negative operating cash flows since our inception and anticipate that we will continue to incur losses for at least the foreseeable future. Our net loss was $73.4 million and $61.8 million for the three months ended March 31, 2023 and March 31, 2022, respectively. We had an accumulated deficit of $643.4 million and $569.9 million as of March 31, 2023 and December 31, 2022, respectively. Based on our cash, cash equivalents and marketable securities balances as of March 31, 2023, management estimates that our liquidity position will enable us to meet operating expenses through at least twelve months after the date that this Quarterly Report is filed. Our marketable securities consist of high-quality, highly liquid available-for-sale debt securities including corporate debt securities, U.S. government securities, non-U.S. government securities, and commercial paper.

Cash Flows

The following table provides information regarding our cash flows for the three months ended March 31, 2023 and March 31, 2022:

	Three Months Ended March 31,
(in thousands)	2023		2022
Net cash used in operating activities	$	(61,818)	$	(48,688)
Net cash provided by investing activities	98,604		26,424
Net cash (used in) provided by financing activities	(1,848)		261
Net increase (decrease) in cash and cash equivalents	34,938		(22,003)
Cash and cash equivalents including Restricted cash, beginning of period	68,068		104,526
Cash and cash equivalents including Restricted cash, end of period	$	103,006	$	82,523

Net Cash Used in Operating Activities

Net cash used in operating activities was $61.8 million for the three months ended March 31, 2023, which was driven by a net loss of $73.4 million and a net decrease from changes in operating assets and liabilities of $13.6 million, partially offset by stock-based compensation expense of $23.4 million, equity investment loss of $1.3 million, non-cash operating lease and depreciation expense of $0.5 million. Net cash used in operating activities was $48.7 million for the three months ended March 31, 2022, driven by a net loss of $61.8 million, and a net decrease from changes in operating assets and liabilities of $4.7 million, partially offset by stock-based compensation expense of $17.1 million, non-cash operating lease expense of $0.3 million and an equity investment loss of $0.3 million.

Net Cash Provided by Investing Activities

Net cash provided by investing activities for the three months ended March 31, 2023 was driven by the sale and maturities of available-for-sale debt securities of $172.5 million, partially offset by purchases of available-for-sale debt securities of $68.1 million, capital expenditures of $3.0 million and our investment in MapKure of $2.8 million. Net cash provided by investing activities for the three months ended March 31, 2022 was related to the sale and maturities of available-for-sale debt securities of $52.1 million, partially offset by purchases of available-for-sale debt securities of $23.2 million and capital expenditures of $2.4 million.

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Net Cash Used in and Provided by Financing Activities

Net cash used in financing activities for the three months ended March 31, 2023 consisted of stock repurchased to satisfy employee tax withholding obligations on restricted stock releases, partially offset by proceeds from stock option exercises. Net cash provided by financing activities for the three months ended March 31, 2022 consisted of proceeds from stock option exercises, partially offset by stock repurchased to satisfy employee tax withholding obligations on restricted stock releases.

Funding Requirements

Our primary use of cash is to fund operating expenses, including our research and development programs, as well as our commercialization activities and corporate operations. Cash used to fund operating expenses is impacted by the timing of when we pay these expenses, as reflected in the change in our outstanding accounts payable, accrued expenses and prepaid expenses.

Our future funding requirements will depend on many factors, including the following:

•the initiation, progress, timing, costs and results of preclinical studies and clinical trials for our product candidates;

•the cost of establishing sales, marketing and distribution capabilities for any product candidates for which we may receive regulatory approval in regions where we choose to commercialize our products on our own;

•the degree of commercial success achieved following the successful completion of development and regulatory approval activities for a product candidate;

•the clinical development plans we establish for our product candidates;

•the number and characteristics of product candidates that we develop;

•the outcome, timing and cost of meeting regulatory requirements established by the FDA, the European Medicines Agency and other comparable foreign regulatory authorities;

•the terms of our existing and any future license or collaboration agreements we may choose to enter into, including the amount of upfront, milestone and royalty obligations;

•the other costs associated with in-licensing new technologies, such as any increased costs of research and development and personnel;

•the cost of filing, prosecuting, defending and enforcing our patent claims and other intellectual property rights;

•the cost of defending intellectual property disputes, including patent infringement actions brought by third parties against us or our product candidates;

•the effect of competing technological and market developments; and

•the cost and timing of completion of commercial-scale outsourced manufacturing activities.

We will need additional funds to meet operational needs and capital requirements for clinical trials, other research and development expenditures, commercial activities and business development efforts. Because of the numerous risks and uncertainties associated with the development and commercialization of our product candidates, we are unable to estimate the amounts of increased capital outlays and operating expenditures associated with our current and anticipated clinical studies.

Until such time, if ever, as we can generate substantial product revenue, we expect to finance our operations through a combination of equity offerings, debt financings, collaborations, strategic alliances and marketing, distribution or licensing arrangements. To the extent that we raise additional capital through the sale of equity or convertible debt securities, current ownership interests will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect rights of common stockholders. Debt financing and preferred equity financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making acquisitions or capital expenditures or declaring dividends. If we raise additional funds through collaborations, strategic alliances or marketing, distribution or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs or product candidates, or grant licenses on terms that may not be favorable to us. If we are unable to raise additional funds through equity or debt financings or other arrangements when needed, we may be required to delay, limit, reduce or terminate our research, product development or future commercialization efforts, or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves.

Effects of Inflation

Although our operations are influenced by general economic conditions, we do not believe that inflation has had a material impact on our business, financial condition, or operating results during the periods presented.

Contractual Obligations

23

In October 2018, the Company entered into a lease for its corporate headquarters in Stamford, CT. In January 2022, the Company amended this lease agreement to extend the lease term through April 2028, with two five-year renewal options or one ten-year renewal option. Pursuant to the amendment, the Company is entitled to $0.5 million in tenant allowances, which may be used to offset certain future capital expenditures, and the lease payments increase by 2.5% in each year commencing December 1, 2022. The amendment was treated as a modification and the lease liability and Operating lease right-of-use asset were updated to reflect minimum lease payments and any other adjustments.

In March 2023, the Company entered into a five-year operating lease in Research Triangle Park in Durham, NC (the location of the Company’s discovery lab and translational operations), with two consecutive five-year renewal options. The lease payments increase by 3.0% in each of the subsequent four years of the five-year operating lease term. Rental payments under the renewal period will be at current market rates for the premises.

As of March 31, 2023, future lease payments under non-cancelable leases with terms greater than one year are as follows:

(in thousands)	Operating Leases
2023	$	418
2024	1,759
2025	1,806
2026	1,854
2027 and thereafter	2,550
Total lease payments	8,387
Less: imputed interest	(1,337)
Present value of lease liabilities	$	7,050

During the three months ended March 31, 2023, there were no other material changes to our contractual obligations and commitments than those described under the heading “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Contractual Obligations” in Part II Item 6. of our 2022 Form 10-K.

We enter into contracts in the normal course of business for clinical trials, preclinical studies, manufacturing and other services and products for operating purposes. These contracts generally provide for termination following a certain period after notice and therefore we believe that our non-cancelable obligations under these agreements are not material.

Critical Accounting Policies and Use of Estimates

This discussion and analysis of our financial condition and results of operations is based on our condensed consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States. The preparation of these condensed consolidated financial statements requires us to make estimates and assumptions that affect the reported amounts and the related disclosures in the financial statements and accompanying notes. These accounting policies involve critical accounting estimates because they are particularly dependent on estimates and assumptions made by management about matters that are uncertain at the time the accounting estimates are made. We base our estimates on historical experience, known trends and other market-specific or relevant factors that we believe to be reasonable under the circumstances, the results of which form the basis of making judgments; however, because future events and their effects cannot be determined with certainty, actual results may differ from those estimates, judgments or assumptions, and such differences could be material. On an ongoing basis, we evaluate our estimates, judgments and assumptions, and adjust those estimates, judgments and assumptions when facts or circumstances change. Changes in estimates are recorded in the period in which they become known. Although we believe that these estimates are reasonable actual results could differ.

We describe our significant accounting policies in Note 3, Summary of Significant Accounting Policies, of the notes to the financial statements included in our 2022 Form 10-K. We discuss our critical accounting estimates in Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations, in our 2022 Form 10-K. There have been no changes in our significant accounting policies or critical accounting estimates during the three months ended March 31, 2023.

Item 3. Quantitative and Qualitative Disclosure About Market Risk

There were no material changes to our market risks from those described in Part II Item 7A. Quantitative and qualitative disclosures about market risk, of our 2022 Form 10-K.

24

Item 4. Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures (as defined in Rule 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934, as amended, or the Exchange Act, as of the end of the period covered by this report. Based on that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures as of the end of the period covered by this report were effective at a reasonable assurance level in ensuring that information required to be disclosed by us in reports that we file or submit under the Exchange Act is (i) recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms; and (ii) accumulated and communicated to management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely discussions regarding required disclosure. We believe that a control system, no matter how well designed and operated, cannot provide absolute assurance that the objectives of the control system are met, and no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within a company have been detected.

There have been no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) of the Exchange Act) during the period covered by this report that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

25

PART II. Other Information

Item 1. Legal Proceedings

As of the date of this Quarterly Report on Form 10-Q, we are not a party to any material legal proceedings. In the future, we may be involved in various claims and legal proceedings relating to claims arising out of our operations. The outcome of litigation cannot be predicted with certainty and some lawsuits, claims or proceedings may be disposed of unfavorably to us, which could materially affect our financial condition or results of operations.

Item 1A. Risk Factors

In addition to the other information contained elsewhere in this report and below, you should carefully consider the risks and uncertainties described in our “Part I, Item 1A—Risk Factors” of our Annual Report on Form 10-K for the year ended December 31, 2022, or 2022 Form 10-K, filed with the Securities and Exchange Commission, or SEC, on February 28, 2023, which could materially and adversely affect our business, prospects, financial condition and results of operations. New risk factors can emerge from time to time, and it is not possible to predict the impact that any factor or combination of factors may have on our business, prospects, financial condition and results of operations. The risk factors disclosure in our 2022 Form 10-K is qualified by the information that is described in this Quarterly Report on Form 10-Q. The risks described below and in our 2022 Form 10-K are not our only risks. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial condition or future results. See below for additional risks and those risks which we consider materially updated from our 2022 Form 10-K.

Adverse developments affecting the financial services industry, such as actual events or concerns involving liquidity, defaults, or non-performance by financial institutions or transactional counterparties, could adversely affect the Company’s current and projected business operations and its financial condition and results of operations.

Actual events involving limited liquidity, defaults, non-performance or other adverse developments that affect financial institutions, transactional counterparties or other companies in the financial services industry or the financial services industry generally, or concerns or rumors about any events of these kinds or other similar risks, have in the past and may in the future lead to market-wide liquidity problems. For example, on March 10, 2023, Silicon Valley Bank, or SVB, was closed by the California Department of Financial Protection and Innovation, which appointed the Federal Deposit Insurance Corporation, or FDIC, as receiver. Similarly, on March 12, 2023, Signature Bank and Silvergate Capital Corp. were each swept into receivership. Although a statement by the Department of the Treasury, the Federal Reserve and the FDIC indicated that all depositors of SVB would have access to all of their money after only one business day of closure, including funds held in uninsured deposit accounts, borrowers under credit agreements, letters of credit and certain other financial instruments with SVB, Signature Bank or any other financial institution that is placed into receivership by the FDIC may be unable to access undrawn amounts thereunder or obtain such access in a timely manner. If any of our counterparties to any such instruments were to be placed into receivership, we may be unable to access such funds. In addition, if any of our customers, suppliers or other parties with whom we conduct business are unable to access funds pursuant to such instruments or lending arrangements with such a financial institution, such parties’ ability to pay their obligations to us or to enter into new commercial arrangements requiring additional payments to us could be adversely affected. In this regard, counterparties to SVB credit agreements and arrangements, and third parties such as beneficiaries of letters of credit (among others), may experience direct impacts from the closure of SVB and uncertainty remains over liquidity concerns in the broader financial services industry. Similar impacts have occurred in the past, such as during the 2008-2010 financial crisis.

Inflation and rapid increases in interest rates have led to a decline in the trading value of previously issued government securities with interest rates below current market interest rates. Although the U.S. Department of Treasury, FDIC and Federal Reserve Board have announced a program to provide up to $25 billion of loans to financial institutions secured by certain of such government securities held by financial institutions to mitigate the risk of potential losses on the sale of such instruments, widespread demands for customer withdrawals or other liquidity needs of financial institutions for immediately liquidity may exceed the capacity of such program. Additionally, there is no guarantee that the U.S. Department of Treasury, FDIC and Federal Reserve Board will provide access to uninsured funds in the future in the event of the closure of other banks or financial institutions, or that they would do so in a timely fashion.

Although we assess our banking and customer relationships as we believe necessary or appropriate, our access to funding sources and other credit arrangements in amounts adequate to finance or capitalize our current and projected future business operations could be significantly impaired by factors that affect the Company, the financial institutions with which the Company may have credit agreements or arrangements directly, or the financial services industry or economy in general. These factors could include, among others, events such as liquidity constraints or failures, the ability to perform obligations under various types of financial, credit or liquidity agreements or arrangements, disruptions or instability in the financial services industry or financial markets, or concerns or negative expectations about the prospects for companies in the financial services industry. These factors could involve financial institutions or financial services industry companies with which the Company

26

has financial or business relationships, but could also include factors involving financial markets or the financial services industry generally.

The results of events or concerns that involve one or more of these factors could include a variety of material and adverse impacts on our current and projected business operations and our financial condition and results of operations. These could include, but may not be limited to, the following:

•Delayed access to deposits or other financial assets or the uninsured loss of deposits or other financial assets; or

•Termination of cash management arrangements and/or delays in accessing or actual loss of funds subject to cash management arrangements.

In addition, investor concerns regarding the U.S. or international financial systems could result in less favorable commercial financing terms, including higher interest rates or costs and tighter financial and operating covenants, or systemic limitations on access to credit and liquidity sources, thereby making it more difficult for us to acquire financing on acceptable terms or at all. Any decline in available funding or access to our cash and liquidity resources could, among other risks, adversely impact our ability to meet our operating expenses, financial obligations or fulfill our other obligations, result in breaches of our financial and/or contractual obligations or result in violations of federal or state wage and hour laws. Any of these impacts, or any other impacts resulting from the factors described above or other related or similar factors not described above, could have material adverse impacts on our liquidity and our current and/or projected business operations and financial condition and results of operations.

In addition, any further deterioration in the macroeconomic economy or financial services industry could lead to losses or defaults by our customers or suppliers, which in turn, could have a material adverse effect on our current and/or projected business operations and results of operations and financial condition. For example, a customer may fail to make payments when due, default under their agreements with us, become insolvent or declare bankruptcy, or a supplier may determine that it will no longer deal with us as a customer. In addition, a customer or supplier could be adversely affected by any of the liquidity or other risks that are described above as factors that could result in material adverse impacts on the Company, including but not limited to delayed access or loss of access to uninsured deposits or loss of the ability to draw on existing credit facilities involving a troubled or failed financial institution. Any customer or supplier bankruptcy or insolvency, or the failure of any customer to make payments when due, or any breach or default by a customer or supplier, or the loss of any significant supplier relationships, could result in material losses to the Company and may have a material adverse impact on our business.

27

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

None.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

None.

Item 5. Other Information

None.

Item 6. Exhibits

28

EXHIBIT INDEX

Exhibit Number	Description
3.1	Amended and Restated Certificate of Incorporation, as amended, of the Registrant, as currently in effect. (Incorporated by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K filed with the Securities and Exchange Commission on September 17, 2019).
3.2	Bylaws of the Registrant, as currently in effect. (Incorporated by reference to Exhibit 3.2 to the Registrant’s Current Report on Form 8-K filed with the Securities and Exchange Commission on September 17, 2019).
3.3	Amendment to Bylaws of the Registrant (Incorporated by reference to Exhibit 3.1 to the Registrants’ Current Report on Form 8-K filed with the Securities and Exchange Commission on May 27, 2020).
4.1	Specimen Stock Certificate evidencing shares of common stock (Incorporated by reference to Exhibit 4.1 to the Registrant’s Registration Statement on Form S 1/A (File No. 333 233351) filed with the Securities and Exchange Commission on September 12, 2019).
4.2	Amended and Restated Investors' Rights Agreement among the Registrant and certain of its stockholders, dated August 30, 2019 (Incorporated by reference to Exhibit 4.2 to the Registrant’s Registration Statement on Form S-1 (File No. 333-233351) filed with the Securities and Exchange Commission on September 12, 2019).
4.3	Description of the Registrant’s Securities (Incorporated by reference to Exhibit 4.3 to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2019, filed March 12, 2020.)
4.4	Amendment to the Amended and Restated Investors’ Rights Agreement, dated as of February 25, 2021 (Incorporated by Reference to Exhibit 4.4 to the Registrant's Annual Report on Form 10-K filed with the Securities and Exchanges Commission on February 25, 2021).
10.1*	Third Amended and Restated Non-Employee Director Compensation Policy.
31.1*	Certification of Principal Executive Officer pursuant to Rule 13a-14(a) or Rule 15d-14(a) of 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 Rule 13a-14(a) or Rule 15d-14(a) of 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	Inline XBRL Instance Document.
101.SCH	Inline XBRL Taxonomy Extension Schema Document.
101.CAL	Inline XBRL Taxonomy Calculation Linkbase Document.
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document.
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document.
104	Cover Page Interactive Data File (formatted as inline XBRL and contained in Exhibit 101)

_____________________________________________

*Filed herewith.

†This certification will not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section. Such certification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended, except to the extent specifically incorporated by reference into such filing.

29

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.

	SPRINGWORKS THERAPEUTICS, INC.
Date: May 3, 2023	By:	/s/ Saqib Islam
		Saqib Islam
		Chief Executive Officer
Date: May 3, 2023	By:	/s/ Francis I. Perier, Jr.
		Francis I. Perier, Jr.
		Chief Financial Officer

30

EX-10.1

SPRINGWORKS THERAPEUTICS, INC. THIRD AMENDED AND RESTATED NON-EMPLOYEE DIRECTOR COMPENSATION POLICY This Amended and Restated Non-Employee Director Compensation Policy (the “Policy”) dated February 23, 2023 (the “Effective Date”) of SpringWorks Therapeutics, Inc., a Delaware corporation (the “Company”) amends and restates the previous Non-Employee Director Compensation Policy which became effective on February 23, 2022. The purpose of the Policy is to provide a total compensation package that enables the Company to attract and retain, on a long-term basis, high- caliber directors who are not employees or officers of the Company. This Policy will apply to all non- employee directors of the Board (such directors, the “Eligible Directors”) of the Company (the “Board”). In furtherance of this purpose, except as otherwise provided in any written agreement between the Company and an Eligible Director, all Eligible Directors shall be paid compensation for services provided to the Company as set forth below: Cash Retainers Annual Retainer for Board Membership: $45,000 for general availability and participation in meetings and conference calls of our Board. No additional compensation for attending individual Board meetings. Additional Annual Retainer for Non-Executive Chair of the Board: $35,000 Additional Annual Retainers for Committee Membership: Audit Committee Chairperson: $20,000 Audit Committee member: $10,000 Compensation Committee Chairperson: $15,000 Compensation Committee member: $7,500 Nominating and Corporate Governance Committee Chairperson: $10,000 Nominating and Corporate Governance Committee member: $5,000 Research and Development Committee Chairperson $15,000 Research and Development Committee member $7,500 Note: Chair and committee member retainers are in addition to retainers for members of the Board of Directors.

All cash retainers will be paid quarterly, in arrears, or upon the earlier of resignation or removal of the Eligible Director. Cash retainers owing to Eligible Directors shall be annualized, meaning that with respect to Eligible Directors who join the Board during the calendar year. For purposes of this Policy, “Value” means with respect to any award of stock options the grant date fair value of the option (i.e., Black-Scholes Value) determined in accordance with the reasonable assumptions and methodologies employed by the Company for calculating the fair value of options under ASC 718. Equity Retainers Initial Equity Grant: For each Eligible Director joining the Board after the Effective Date, upon his or her initial appointment to the Board, each such Eligible Director shall receive a one-time equity grant representing that number of shares of the Company’s common stock, par value $0.0001 per share (“Common Stock”) that has a Value equivalent to $900,000, with two-thirds of such value to be provided in stock options for shares of the Common Stock, whish shall vest in equal monthly installments over three years starting from the Eligible Director’s commencement on the Board, and one-third of such value to be provided in restricted stock awards, representing shares of Common Stock, which shall vest in equal annual installments over three years starting from the Eligible Director’s commencement on the Board, subject to, in each case, the Eligible Director’s continued service on the Board through each such vesting date. Annual Equity Grant: Immediately following each annual meeting of the Company’s stockholders, each continuing Eligible Director will receive an annual equity grant representing that number of shares of Common Stock that has a Value equivalent to $450,000, with two-thirds of such value to be provided in stock options for shares of Common Stock and one-third of such value to be provided in restricted stock awards, representing shares of Common Stock. Such annual equity grant shall vest on the earlier of the one-year anniversary of the grant date and the Company’s next annual meeting of stockholders, subject to the Eligible Director’s continued service on the Board through such date. All of the foregoing equity grants will become immediately exercisable upon the death, disability of an Eligible Director or upon a Sale Event (as defined in the Company’s Amended and Restated 2019 Stock Option and Incentive Plan). In addition, Eligible Directors will have until the earlier of one year following cessation of service as a director or the original expiration date of the option to exercise the option (to the extent vested at the date of such cessation), provided that the Eligible Director has not been removed for cause. Any stock option granted to an Eligible Director pursuant to this Policy will be granted at an exercise price equal to the Fair Market Value of a share of Common Stock on the date of grant (as defined in the Company’s Amended and Restated 2019 Stock Option and Incentive Plan).

Expenses The Company shall reimburse all reasonable out-of-pocket expenses incurred by Eligible Directors in attending Board and committee meetings.

EX-31.1

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

CERTIFICATIONS

I, Saqib Islam, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of SpringWorks 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 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)):

(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 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 3, 2023	By:	/s/ Saqib Islam
		Saqib Islam
		Chief Executive Officer
		(Principal Executive Officer)

EX-31.2

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

CERTIFICATIONS

I, Francis I. Perier, Jr., certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of SpringWorks 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 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)):

(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 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 3, 2023	By:	/s/ Francis I. Perier, Jr.
		Francis I. Perier, Jr.
		Chief Financial Officer
		(Principal Financial Officer)

EX-32.1

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 on Form 10-Q of SpringWorks Therapeutics, Inc. (the “Company”) for the period ended March 31, 2023, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, Saqib Islam, Chief Executive Officer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to his knowledge:

(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 results of operations of the Company.

Date: May 3, 2023	By:	/s/ Saqib Islam
		Saqib Islam
		Chief Executive Officer
		(Principal Executive Officer)

EX-32.2

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

In connection with the Quarterly Report on Form 10-Q of SpringWorks Therapeutics, Inc. (the “Company”) for the period ended March 31, 2023, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, Francis I. Perier, Jr., Chief Financial Officer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to his knowledge:

(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 results of operations of the Company.

Date: May 3, 2023	By:	/s/ Francis I. Perier, Jr.
		Francis I. Perier, Jr.
		Chief Financial Officer
		(Principal Financial Officer)

XML

Cover - shares	3 Months Ended
	Mar. 31, 2023	Apr. 28, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Transition Report	false
Entity File Number	001-39044
Entity Registrant Name	SPRINGWORKS THERAPEUTICS, INC.
Entity Incorporation, State	DE
Entity Tax Identification Number	83-4066827
Entity Address, Street	100 Washington Blvd
Entity Address, City	Stamford
Entity Address, State	CT
Entity Address, Zip Code	06902
City Area Code	203
Local Phone Number	883-9490
Title of each class	Common Stock, par value $0.0001 per share
Trading Symbol(s)	SWTX
Name of each exchange on which registered	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		62,523,060
Entity Central Index Key	0001773427
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1

XML

Condensed Consolidated Balance Sheets​ (Unaudited)​ - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 102,401	$ 67,490
Marketable securities	425,740	524,722
Prepaid expenses and other current assets	9,516	7,548
Total current assets	537,657	599,760
Long-term marketable securities	0	4,794
Property and equipment, net	15,728	13,571
Operating lease right-of-use assets	6,602	4,698
Equity investment	5,714	4,193
Restricted cash	605	578
Other assets	2,891	2,648
Total assets	569,197	630,242
Current liabilities:
Accounts payable	6,990	8,010
Accrued expenses	28,687	39,242
Operating lease liabilities, current	386	483
Deferred revenue, current	1,690	3,314
Total current liabilities	37,753	51,049
Operating lease liabilities, long-term	6,664	4,768
Deferred revenue, long-term	17,856	16,233
Total liabilities	62,273	72,050
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.0001 par value, 10,000,000 shares authorized, no shares issued or outstanding at March 31, 2023 and December 31, 2022.	0	0
Common stock, $0.0001 par value, 150,000,000 shares authorized, 62,623,777 and 62,453,328 shares issued, and 62,523,438 and 62,423,129 shares outstanding at March 31, 2023 and December 31, 2022, respectively.	6	6
Additional paid-in capital	1,153,702	1,130,224
Accumulated deficit	(643,350)	(569,930)
Treasury stock, at cost (100,339 and 30,199 shares of common stock at March 31, 2023 and December 31, 2022, respectively).	(3,272)	(1,341)
Accumulated other comprehensive loss	(162)	(767)
Total stockholders’ equity	506,924	558,192
Total liabilities and stockholders’ equity	$ 569,197	$ 630,242

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Condensed Consolidated Balance Sheets​ (Unaudited)​ (Parenthetical) - $ / shares	Mar. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Preferred stock, par value (usd per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (shares)	10,000,000	10,000,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Common stock, par value (usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (shares)	150,000,000	150,000,000
Common stock, shares issued (shares)	62,623,777	62,453,328
Common stock, shares outstanding (shares)	62,523,438	62,423,129
Treasury stock, at cost (100,339 and 30,199 shares of common stock at March 31, 2023 and December 31, 2022, respectively).	100,339	30,199

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Condensed Consolidated Statements of Operations (Unaudited)​ - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating expenses:
Research and development	$ 33,524	$ 34,103
General and administrative	44,175	27,366
Total operating expenses	77,699	61,469
Loss from operations	(77,699)	(61,469)
Interest and other income (expense):
Other expense	(199)	(193)
Interest income, net	5,756	198
Total interest and other income	5,557	5
Equity investment loss	(1,278)	(337)
Net loss	$ (73,420)	$ (61,801)
Net loss per share, basic (usd per share)	$ (1.18)	$ (1.26)
Net loss per share, diluted (usd per share)	$ (1.18)	$ (1.26)
Weighted average number of shares outstanding, basic (in shares)	62,326,992	48,937,756
Weighted average number of shares outstanding, diluted (in shares)	62,326,992	48,937,756

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Condensed Consolidated Statements of Comprehensive Loss (Unaudited)​ - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net loss	$ (73,420)	$ (61,801)
Changes in other comprehensive income:
Unrealized gain (loss) on marketable securities, net	605	(1,146)
Total changes in other comprehensive income	605	(1,146)
Comprehensive loss	$ (72,815)	$ (62,947)

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Condensed Consolidated Statements of Stockholders’ Equity (Unaudited)​ - USD ($) $ in Thousands	Total	Common	Treasury	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance at Dec. 31, 2021	$ 422,396	$ 5	$ 0	$ 715,216	$ (312)	$ (292,513)
Balance at the beginning (in shares) at Dec. 31, 2021		49,247,985
Balance at the beginning (in shares) at Dec. 31, 2021			0
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	17,094			17,094
Issuance of restricted stock award (in shares)		36,625
Forfeiture of restricted stock awards (in shares)		(3,440)
Exercise of stock options (in shares)		142,657
Exercise of stock options	1,167			1,167
Shares of common stock used to satisfy tax withholding obligations (in shares)			16,210
Shares of common stock used to satisfy tax withholding obligations	(906)		$ (906)
Other comprehensive income (loss), net of tax	(1,146)				(1,146)
Net loss	(61,801)					(61,801)
Ending balance at Mar. 31, 2022	376,804	$ 5	$ (906)	733,477	(1,458)	(354,314)
Balance at the end (in shares) at Mar. 31, 2022		49,423,827
Balance the end (in shares) at Mar. 31, 2022			16,210
Beginning balance at Dec. 31, 2022	$ 558,192	$ 6	$ (1,341)	1,130,224	(767)	(569,930)
Balance at the beginning (in shares) at Dec. 31, 2022	62,423,129	62,453,328
Balance at the beginning (in shares) at Dec. 31, 2022	30,199		30,199
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	$ 23,395			23,395
Forfeiture of restricted stock awards (in shares)		(1,039)
Exercise of stock options (in shares)		30,913
Exercise of stock options	83			83
Shares of common stock used to satisfy tax withholding obligations (in shares)			70,140
Shares of common stock used to satisfy tax withholding obligations	(1,931)		$ (1,931)
Restricted stock units vested (in shares)		140,575
Other comprehensive income (loss), net of tax	605				605
Net loss	(73,420)					(73,420)
Ending balance at Mar. 31, 2023	$ 506,924	$ 6	$ (3,272)	$ 1,153,702	$ (162)	$ (643,350)
Balance at the end (in shares) at Mar. 31, 2023	62,523,438	62,623,777
Balance the end (in shares) at Mar. 31, 2023	100,339		100,339

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Condensed Consolidated Statements of Cash Flows (Unaudited)​ - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities
Net loss	$ (73,420)	$ (61,801)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	253	108
Non-cash operating lease expense	286	272
Stock compensation expense	23,395	17,094
Equity investment loss	1,278	337
Changes in operating assets and liabilities
Prepaid expenses and other current assets	(1,968)	1,729
Other assets	(243)	82
Accounts payable	(753)	(1,770)
Accrued expenses	(10,255)	(4,695)
Lease liability	(391)	(44)
Net cash used in operating activities	(61,818)	(48,688)
Investing activities
Capital expenditures	(2,977)	(2,387)
Equity investment	(2,800)	0
Purchases of marketable securities	(68,148)	(23,242)
Proceeds from sale and maturity of debt securities	172,529	52,053
Net cash provided by investing activities	98,604	26,424
Financing activities
Treasury stock	(1,931)	(906)
Proceeds from stock option exercises	83	1,167
Net cash (used in) provided by financing activities	(1,848)	261
Net increase (decrease) in cash and cash equivalents	34,938	(22,003)
Cash and cash equivalents including Restricted cash, beginning of period	68,068	104,526
Cash and cash equivalents including Restricted cash, end of period	103,006	82,523
Non-cash investing activities
Right-of-use assets obtained in exchange for operating lease obligations	$ 2,136	$ 5,580

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Nature of Operations

3 Months Ended

Mar. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Nature of Operations

Nature of Operations

SpringWorks Therapeutics, Inc., together with its wholly-owned subsidiaries, collectively, the Company, is a clinical-stage biopharmaceutical company applying a precision medicine approach to acquiring, developing and commercializing life-changing medicines for underserved patient populations suffering from devastating rare diseases and cancer. The Company has a differentiated portfolio of small molecule targeted oncology product candidates and is advancing programs in both rare tumor types as well as highly prevalent, genetically defined cancers. Two of the programs are late-stage clinical product candidates: nirogacestat and mirdametinib. In December 2022, the Company submitted a New Drug Application, or NDA, to the U.S. Food and Drug Administration, or FDA, for nirogacestat for the treatment of adults with desmoid tumors. In February 2023, the NDA filing was accepted by the FDA and granted priority review with an assigned Prescription Drug User Fee Act, or PDUFA, target action date of August 27, 2023.

The Company has incurred losses and negative operating cash flows since inception and had an accumulated deficit of $643.4 million and $569.9 million, and working capital of $499.9 million and $548.7 million, as of March 31, 2023 and December 31, 2022, respectively. The Company is subject to those risks associated with any biopharmaceutical company that has substantial expenditures for development. There can be no assurance that the Company’s development projects will be successful, that products developed will obtain necessary regulatory approval, or that any approved product will be commercially viable. In addition, the Company operates in an environment of rapid technological change and is largely dependent on the services of its employees, advisors, consultants and vendors.

The Company had cash, cash equivalents and marketable securities of $528.1 million and $597.0 million as of March 31, 2023 and December 31, 2022, respectively. Based on the Company's cash, cash equivalents and marketable securities as of March 31, 2023, management estimates that its current liquidity will enable it to meet operating expenses through at least twelve months after the date that these financial statements are issued.

COVID-19 Pandemic

Coronavirus, or COVID-19, including emerging variant strains of COVID-19, has continued to spread in the areas in which the Company operates. The Company's response has evolved over the course of the ongoing COVID-19 pandemic, and the Company has largely resumed normal operations. In the United States, the government has announced a plan for the expiration of the federal Public Health Emergency and national emergency declarations for COVID-19 in May 2023. During the periods presented, the Company did not experience any material disruptions to the execution of research and development or commercialization preparation activities; however, as a result of the COVID-19 pandemic, or any impacts of emerging variant strains of the COVID-19 virus, stagnant vaccination rates and related factors, the Company may experience disruptions that could impact its research and development and commercialization timelines and outcomes. The Company will continue to evaluate the impact of the ongoing COVID-19 pandemic, along with the impact of emerging variants, on its business. While the extent to which the ongoing COVID-19 pandemic impacts the Company’s future results will depend on future developments, the pandemic and associated impacts, including the duration, spread and intensity of the pandemic (including any resurgences), the impact of emerging variant strains of the COVID-19 virus and the rollout of COVID-19 vaccines, all of which remain uncertain and difficult to predict, could result in a material impact to the Company’s business, prospects, future financial condition, results of operations and cash flows.

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Basis of Presentation

3 Months Ended

Mar. 31, 2023

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The Company’s unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States, or U.S. GAAP, for interim financial information and Article 10 of Regulation S-X of the Securities and Exchange Commission, or SEC, and should be read in conjunction with the Company's consolidated financial statements and notes thereto contained in the Company's Annual Report on Form 10-K for the year ended December 31, 2022, filed with the SEC on February 28, 2023. The condensed consolidated financial statements presented in this Quarterly Report on Form 10-Q are unaudited; however, in the opinion of management, such financial statements reflect all adjustments, consisting solely of normal recurring adjustments, necessary for a fair presentation of the results for the interim periods presented.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts in the financial statements and accompanying notes. Estimates and assumptions

reflected in these condensed consolidated financial statements include, but are not limited to, research and development expenses and the valuation of stock-based compensation awards. Management bases its estimates on historical experience, known trends and other market-specific or relevant factors that it believes to be reasonable under the circumstances. Actual results may differ from those estimates or assumptions. On an ongoing basis, management evaluates its estimates, and adjusts those estimates and assumptions when facts or circumstances change. Changes in estimates are recorded in the period in which they become known.

Research and Development Expenses

In accordance with ASC 730, “Research and Development”, expenditures for clinical development, including upfront licensing fees and milestone payments associated with products that have not yet been approved by the FDA, are charged to research and development expense as incurred. These expenses consist of expenses incurred in performing development activities, including salaries and benefits, stock-based compensation expense, preclinical expenses, clinical trial and related clinical manufacturing expenses, contract services and other outside expenses. Expenses incurred for certain research and development activities, including expenses associated with particular activities performed by contract research organizations, investigative sites in connection with clinical trials and contract manufacturing organizations, are recognized based on an evaluation of the progress or completion of specific tasks using either time-based measures or data such as information provided to the Company by its vendors on actual activities completed or costs incurred. Payments for these activities are based on the terms of the individual arrangements, which may differ from the pattern of expense recognition. Expenses for research and development activities incurred that have yet to be invoiced by the vendors that perform the related activities are recorded as accrued research and development expenses. Advance payments for goods or services to be received in the future for research and development activities are deferred and capitalized. The capitalized amounts are expensed as the related goods are delivered or the services are performed.

Segment Information

Operating segments are defined as components of an entity about which separate discrete information is available for evaluation by the chief operating decision maker, or decision-making group, in deciding how to allocate resources and in assessing performance. The Company views its operations and manages its business in one operating segment operating exclusively in the United States.

Recently Adopted Accounting Pronouncements

There were no recently adopted accounting pronouncements that had a material impact on the Company's financial statements, and no recently issued accounting pronouncements that are expected to have a material impact on the Company's financial statements.

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Marketable Securities

3 Months Ended

Mar. 31, 2023

Investments, Debt and Equity Securities [Abstract]

Marketable Securities

Marketable Securities

The following table summarizes the Company’s available-for-sale marketable securities as of March 31, 2023 and December 31, 2022:

	As of March 31, 2023
(in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Marketable securities:
Short-term investments:
U.S. government securities	$	197,173	$	—	$	(96)	$	197,077
Non-U.S. government securities	1,996		—		(5)		1,991
Corporate debt securities	39,140		—		(61)		39,079
Commercial paper	187,593		—		—		187,593
Total	$	425,902	$	—	$	(162)	$	425,740

	As of December 31, 2022
(in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Marketable securities:
Short-term investments:
U.S. government securities	$	232,229	$	—	$	(690)	$	231,539
Non-U.S. government securities	9,388		—		(31)		9,357
Corporate debt securities	45,710		—		(44)		45,666
Commercial paper	238,160		—		—		238,160
Long-term investments:
Corporate debt securities	4,796		—		(2)		4,794
Total	$	530,283	$	—	$	(767)	$	529,516

The Company’s marketable securities are available-for-sale securities and consist of high-quality, highly liquid debt securities including corporate debt securities, U.S. government securities, non-U.S. government securities, and commercial paper.

The Company’s securities classified as short-term marketable securities mature within one year or less of the balance sheet date. Marketable securities that mature greater than one year from the balance sheet date are classified as long-term. As of March 31, 2023, the Company did not hold any investments with maturity dates greater than five years.

As of, and for the three months ended March 31, 2023, the Company did not have any allowance for credit losses or impairments of its marketable securities.

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Fair Value Measurements

3 Months Ended

Mar. 31, 2023

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The fair value of the Company’s financial assets measured on a recurring basis are classified based upon a fair value hierarchy consisting of the following three levels:

Level 1 — Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets, or liabilities.

Level 2 — Quoted prices for similar assets and liabilities in active markets, quoted prices in markets that are not active, or inputs which are observable, either directly or indirectly, for substantially the full term of the instrument.

Level 3 — Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity).

The fair value hierarchy is based on inputs to valuation techniques used to measure fair value that are either observable or unobservable. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity's pricing based upon their own market assumptions.

As of March 31, 2023 and December 31, 2022, the Company's financial assets and liabilities measured at fair value on a recurring basis consisted of the following:

	As of March 31, 2023
			Fair Value Hierarchy
(in thousands)	Total		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	39,780	$	39,780	$	—	$	—
Corporate debt securities	—		—		—		—
Short-term investments:
U.S. government securities	197,076		197,076		—		—
Non-U.S. government securities	1,991		—		1,991		—
Corporate debt securities	39,079		—		39,079		—
Commercial paper	187,593		—		187,593		—
Total	$	465,519	$	236,856	$	228,663	$	—

	As of December 31, 2022
			Fair Value Hierarchy
(in thousands)	Total		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	22,494	$	22,494	$	—	$	—
Corporate debt securities	—		—		—		—
Short-term investments:
U.S. government securities	231,539		231,539		—		—
Non-U.S. government securities	9,357		—		9,357		—
Corporate debt securities	45,666		—		45,666		—
Commercial paper	238,160		—		238,160		—
Long-term investments:
Corporate debt securities	4,794		—		4,794		—
Total	$	552,010	$	254,033	$	297,977	$	—

As of March 31, 2023 and December 31, 2022, the Company’s financial assets measured at fair value on a recurring basis using a market approach included cash equivalents, which consist of money market funds, and marketable securities, which consist of high-quality, highly liquid available-for-sale debt securities including corporate debt securities, U.S. government securities, non-U.S. government securities, and commercial paper.

The Company’s money market funds are readily convertible into cash and the net asset value of each fund on the last day of the quarter is used to determine fair value. The U.S. government securities are classified as Level 1 and valued utilizing quoted market prices. The Company’s corporate debt securities, non-U.S. government securities, and commercial paper are classified as Level 2 and valued utilizing various market and industry inputs.

The Company considers all highly liquid instruments that have maturities of three months or less when acquired to be cash equivalents. The carrying amounts for cash equivalents, accounts payable, and accrued expenses approximate fair value due to their short-term maturities.

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Collaboration, Licensing and Variable Interest Entities

3 Months Ended

Mar. 31, 2023

Equity Method Investments and Joint Ventures [Abstract]

Collaboration, Licensing And Variable Interest Entity

Collaboration, Licensing and Variable Interest Entities

MapKure

In June 2019, the Company announced the formation of MapKure LLC, or MapKure, an entity jointly owned by the Company and BeiGene Ltd., or BeiGene. BeiGene licensed to MapKure exclusive rights to brimarefenib (BGB-3245), an investigational oral, small molecule selective inhibitor of specific BRAF driver mutations and genetic fusions. MapKure is advancing brimarefenib through clinical development for solid tumor patients harboring BRAF driver mutations and genetic fusions that were observed to be sensitive to the compound in preclinical studies. In addition to the Company’s equity ownership in MapKure, the Company maintains a member on each of MapKure’s joint steering committee and board of directors. The

Company also contributes to clinical development and other operational activities for brimarefenib through a service agreement with MapKure.

In conjunction with the formation of MapKure in June 2019, the Company purchased 3,500,000 Series A preferred units of MapKure, or a 25.0% ownership interest, for $3.5 million and in June 2020, the Company purchased an additional 3,500,000 Series A preferred units of MapKure for $3.5 million, increasing its ownership interest to 38.9%, as required by the terms of the Series A unit purchase agreement.

In June 2022, the Company made an additional investment in MapKure and purchased 4,200,000 Series B preferred units of MapKure for $4.2 million, pursuant to the terms of a Series B preferred unit purchase agreement. In January 2023, pursuant to terms of the Series B preferred unit purchase agreement, the Company purchased an additional 2,800,000 Series B preferred units of MapKure for $2.8 million. As of March 31, 2023, the Company’s ownership interest in MapKure was 38.9%.

The Company determined that MapKure is a variable interest entity. The Company is not the primary beneficiary, as the Company does not have the power to direct the activities that most significantly impact the economic performance of MapKure. Accordingly, the Company does not consolidate the financial statements of this entity and accounts for this investment using the equity method of accounting based on a one quarter lag.

The Company recognized an equity loss of $1.3 million and $0.3 million for the three month periods ended March 31, 2023 and March 31, 2022, respectively. The Company’s ownership interest in MapKure is included in Equity method investments. The balance of the Company’s investment was $5.7 million as of March 31, 2023, representing the maximum exposure to loss as a result of the Company’s involvement with MapKure.

GSK Expanded Non-exclusive License and Collaboration Agreement

In September 2022, the Company announced an expansion of its ongoing, non-exclusive clinical collaboration with GSK plc, formerly GlaxoSmithKline plc, or GSK, which originally commenced in June 2019. The announcement coincided with the entry by the Company and GSK into an amended and restated collaboration and license agreement, or the GSK License Agreement, for the potential continued development and commercialization of nirogacestat in combination with either belantamab mafodotin (belamaf), GSK’s antibody-drug conjugate, or ADC, targeting B-cell maturation antigen, or BCMA, or any other cytotoxic ADC targeting BCMA derived from belantamab that is controlled by GSK, either alone as a combination therapy, or together with other pharmaceutical agents.

Pursuant to the terms of the GSK License Agreement and concurrent with the execution of such agreement, the Company entered into a Stock Purchase Agreement with GGL, under which GGL purchased 2,050,819 shares of the Company’s Common Stock, par value $0.0001 per share, or Common Stock, in a private placement transaction for an aggregate purchase price of approximately $75.0 million, or $36.57 per share. The shares were sold at a 25% premium to the volume-weighted average share price of the Common Stock for a specified 30-day period prior to entering into the Stock Purchase Agreement. The fair value of the Common Stock based on the closing price of Common Stock on the day prior to the effective date of the Stock Purchase Agreement was $55.5 million and was recorded to equity. The $19.5 million of consideration received in excess of the fair value of the Common Stock represents consideration for the license for the potential continued development and commercialization of nirogacestat in combination with GSK compounds, together with the clinical supply of nirogacestat for future belamaf clinical trials and certain research and development costs associated with nirogacestat. The Company recorded the $19.5 million as deferred revenue in September of 2022 and will recognize revenue as the corresponding performance obligation is satisfied in proportion to expenses incurred, including clinical supply and research and development expenses, associated with the GSK License Agreement. For the three month period ended March 31, 2023, the revenue related to the upfront consideration received from the GSK License Agreement is insignificant.

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Accrued Expenses

3 Months Ended

Mar. 31, 2023

Payables and Accruals [Abstract]

Accrued Expenses

Accrued ExpensesAccrued expenses consists of the following:

	March 31,		December 31,
(in thousands)	2023		2022
Accrued professional fees	$	1,525	$	1,780
Accrued compensation and benefits	9,133		19,142
Accrued research and development	12,009		12,321
Accrued other	6,020		5,999
Total accrued expenses	$	28,687	$	39,242

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

The Company enters into contracts in the normal course of business for clinical trials, preclinical studies, manufacturing and other services and products for operating purposes. These contracts generally provide for termination following a certain period after notice and therefore the Company believes that non-cancelable obligations under these agreements are not material.

Additionally, the Company has excluded milestone or royalty payments or other contractual payment obligations as the timing and amounts of such obligations are unknown or uncertain.

Leases

In October 2018, the Company entered into a lease for its corporate headquarters in Stamford, CT. In January 2022, the Company amended this lease agreement to extend the lease term through April 2028, with two five-year renewal options or one ten-year renewal option. Pursuant to the amendment, the Company is entitled to $0.5 million in tenant allowances, which may be used to offset certain future capital expenditures, and the lease payments increase by 2.5% in each year commencing December 1, 2022. The amendment was treated as a modification and the lease liability and Operating lease right-of-use asset were updated to reflect minimum lease payments and any other adjustments.

In March 2023, the Company entered into a five-year operating lease in Research Triangle Park in Durham, NC (the location of the Company’s discovery lab and translational operations), with two consecutive five-year renewal options. The lease payments increase by 3.0% in each of the subsequent four years of the five-year operating lease term. Rental payments under the renewal period will be at current market rates for the premises.

As of March 31, 2023, future lease payments under non-cancelable leases with terms greater than one year are as follows:

(in thousands)	Operating Leases
2023	$	418
2024	1,759
2025	1,806
2026	1,854
2027 and thereafter	2,550
Total lease payments	8,387
Less: imputed interest	(1,337)
Present value of lease liabilities	$	7,050

Contingencies

From time to time, the Company may be involved in disputes or regulatory inquiries that arise in the ordinary course of business. When the Company determines that a loss is both probable and reasonably estimable, a liability is recorded and disclosed if the amount is material to the financial statements taken as a whole. When a material loss contingency is only reasonably possible, the Company does not record a liability, but instead discloses the nature and the amount of the claim, and an estimate of the loss or range of loss, if such an estimate can reasonably be made.

As of March 31, 2023, there was no litigation or contingency with at least a reasonable possibility of a material loss.

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Stock-Based Compensation

3 Months Ended

Mar. 31, 2023

Share-Based Payment Arrangement [Abstract]

Stock-Based Compensation

Stock-Based Compensation

2019 Equity Incentive Plan

The Company's 2019 Stock Option and Incentive Plan, or 2019 Equity Incentive Plan, provides for the grant of incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock units, restricted stock awards, unrestricted stock awards and dividend equivalent rights to the Company’s officers, employees, directors and other key persons (including consultants). The number of shares available for issuance under the 2019 Equity Incentive Plan is cumulatively increased each January 1, through and including January 1, 2030, by 5% of the number of shares of the Company’s common stock outstanding on the immediately preceding December 31 or such lesser number of shares determined by the Company’s compensation committee.

As of March 31, 2023, there were 4,332,038 shares available for issuance in connection with future awards under the 2019 Equity Incentive Plan.

Stock-Based Awards

During the three months ended March 31, 2023, the Company granted 2,496,476 stock option awards to its officers, employees and directors under the 2019 Equity Incentive Plan.

During the three months ended March 31, 2023, the Company awarded 1,175,681 restricted stock units to its officers, employees and directors under the 2019 Equity Incentive Plan.

During the three months ended March 31, 2023, 55,417 restricted stock awards previously issued to employees of the Company were released, 140,575 restricted stock units vested and 30,913 stock options were exercised. As of March 31, 2023, there were 4,926,147 stock options vested and exercisable.

In June 2019, the Company’s Chief Executive Officer, or CEO, received an award of 176,411 stock options, or the 2019 CEO Performance Award. During the quarter ended March 31, 2023, 11,025 options of the 2019 CEO Performance Award became exercisable upon the satisfaction of the market condition applicable to this award.

Performance Stock Units

On January 5, 2023, the CEO was granted a supplemental equity award consisting of performance-based restricted stock units, or a Performance Based RSU. The Performance-Based RSU covers a target of 284,362 shares common stock and vests over a four year performance period subject but not limited to the achievement of certain regulatory milestones and the CEO’s continued service with the Company. In addition, the target number of shares of common stock covered is subject to modification (upwards or downwards) by up to 25% based upon the relative total shareholder return of the Company’s shares compared to the NASDAQ Biotech Index as of the end of the performance period.

Stock-based compensation expense included in the condensed consolidated statements of operations for each of the periods presented is as follows:

	Three Months Ended March 31,
(in thousands)	2023		2022
Research and development	$	8,918	$	7,072
General and administrative	14,477		10,022
Total stock-based compensation expense	$	23,395	$	17,094

As of March 31, 2023, the unrecognized compensation expense related to unvested stock options, restricted stock units and restricted stock awards was $168.9 million, $43.8 million and $8.8 million, respectively, which is expected to be recognized over a weighted-average remaining period of approximately 2.85, 2.51 years and 1.29 years, respectively.

As of March 31, 2023, the Company had 11,619,559 stock options outstanding, 1,703,188 unvested restricted stock units and 165,303 unvested restricted stock awards.

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Net Loss per Share

3 Months Ended

Mar. 31, 2023

Earnings Per Share [Abstract]

Net Loss per Share

Net Loss per Share

Since the Company had a net loss in each of the periods presented, basic and diluted net loss per share are the same. The table below provides potentially dilutive securities not included in the computation of the diluted net loss per share for the periods ended March 31, 2023 and March 31, 2022, because to do so would be anti-dilutive:

	As of March 31,
	2023	2022
Common stock options issued and outstanding	11,619,559	7,832,865
Restricted stock units subject to future vesting	1,703,188	459,614
Restricted stock awards subject to future vesting	165,303	398,510
Total potentially dilutive securities	13,488,050	8,690,989

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Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2023

Accounting Policies [Abstract]

Basis of Presentation

Basis of PresentationThe Company’s unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States, or U.S. GAAP, for interim financial information and Article 10 of Regulation S-X of the Securities and Exchange Commission, or SEC, and should be read in conjunction with the Company's consolidated financial statements and notes thereto contained in the Company's Annual Report on Form 10-K for the year ended December 31, 2022, filed with the SEC on February 28, 2023. The condensed consolidated financial statements presented in this Quarterly Report on Form 10-Q are unaudited; however, in the opinion of management, such financial statements reflect all adjustments, consisting solely of normal recurring adjustments, necessary for a fair presentation of the results for the interim periods presented.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts in the financial statements and accompanying notes. Estimates and assumptions

reflected in these condensed consolidated financial statements include, but are not limited to, research and development expenses and the valuation of stock-based compensation awards. Management bases its estimates on historical experience, known trends and other market-specific or relevant factors that it believes to be reasonable under the circumstances. Actual results may differ from those estimates or assumptions. On an ongoing basis, management evaluates its estimates, and adjusts those estimates and assumptions when facts or circumstances change. Changes in estimates are recorded in the period in which they become known.

Research and Development Expenses

Research and Development Expenses

In accordance with ASC 730, “Research and Development”, expenditures for clinical development, including upfront licensing fees and milestone payments associated with products that have not yet been approved by the FDA, are charged to research and development expense as incurred. These expenses consist of expenses incurred in performing development activities, including salaries and benefits, stock-based compensation expense, preclinical expenses, clinical trial and related clinical manufacturing expenses, contract services and other outside expenses. Expenses incurred for certain research and development activities, including expenses associated with particular activities performed by contract research organizations, investigative sites in connection with clinical trials and contract manufacturing organizations, are recognized based on an evaluation of the progress or completion of specific tasks using either time-based measures or data such as information provided to the Company by its vendors on actual activities completed or costs incurred. Payments for these activities are based on the terms of the individual arrangements, which may differ from the pattern of expense recognition. Expenses for research and development activities incurred that have yet to be invoiced by the vendors that perform the related activities are recorded as accrued research and development expenses. Advance payments for goods or services to be received in the future for research and development activities are deferred and capitalized. The capitalized amounts are expensed as the related goods are delivered or the services are performed.

Segment Information

Segment Information

Operating segments are defined as components of an entity about which separate discrete information is available for evaluation by the chief operating decision maker, or decision-making group, in deciding how to allocate resources and in assessing performance. The Company views its operations and manages its business in one operating segment operating exclusively in the United States.

Recently Adopted Accounting Pronouncements

Recently Adopted Accounting Pronouncements

There were no recently adopted accounting pronouncements that had a material impact on the Company's financial statements, and no recently issued accounting pronouncements that are expected to have a material impact on the Company's financial statements.

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Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2023

Investments, Debt and Equity Securities [Abstract]

Schedule Of Available-for-sale Marketable Securities

The following table summarizes the Company’s available-for-sale marketable securities as of March 31, 2023 and December 31, 2022:

	As of March 31, 2023
(in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Marketable securities:
Short-term investments:
U.S. government securities	$	197,173	$	—	$	(96)	$	197,077
Non-U.S. government securities	1,996		—		(5)		1,991
Corporate debt securities	39,140		—		(61)		39,079
Commercial paper	187,593		—		—		187,593
Total	$	425,902	$	—	$	(162)	$	425,740

	As of December 31, 2022
(in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Marketable securities:
Short-term investments:
U.S. government securities	$	232,229	$	—	$	(690)	$	231,539
Non-U.S. government securities	9,388		—		(31)		9,357
Corporate debt securities	45,710		—		(44)		45,666
Commercial paper	238,160		—		—		238,160
Long-term investments:
Corporate debt securities	4,796		—		(2)		4,794
Total	$	530,283	$	—	$	(767)	$	529,516

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2023

Fair Value Disclosures [Abstract]

Schedule of financial assets subject to fair value measurements

As of March 31, 2023 and December 31, 2022, the Company's financial assets and liabilities measured at fair value on a recurring basis consisted of the following:

	As of March 31, 2023
			Fair Value Hierarchy
(in thousands)	Total		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	39,780	$	39,780	$	—	$	—
Corporate debt securities	—		—		—		—
Short-term investments:
U.S. government securities	197,076		197,076		—		—
Non-U.S. government securities	1,991		—		1,991		—
Corporate debt securities	39,079		—		39,079		—
Commercial paper	187,593		—		187,593		—
Total	$	465,519	$	236,856	$	228,663	$	—

	As of December 31, 2022
			Fair Value Hierarchy
(in thousands)	Total		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	22,494	$	22,494	$	—	$	—
Corporate debt securities	—		—		—		—
Short-term investments:
U.S. government securities	231,539		231,539		—		—
Non-U.S. government securities	9,357		—		9,357		—
Corporate debt securities	45,666		—		45,666		—
Commercial paper	238,160		—		238,160		—
Long-term investments:
Corporate debt securities	4,794		—		4,794		—
Total	$	552,010	$	254,033	$	297,977	$	—

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Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2023

Payables and Accruals [Abstract]

Schedule of accrued expenses

Accrued expenses consists of the following:

	March 31,		December 31,
(in thousands)	2023		2022
Accrued professional fees	$	1,525	$	1,780
Accrued compensation and benefits	9,133		19,142
Accrued research and development	12,009		12,321
Accrued other	6,020		5,999
Total accrued expenses	$	28,687	$	39,242

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Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Schedule of future minimum lease obligations

As of March 31, 2023, future lease payments under non-cancelable leases with terms greater than one year are as follows:

(in thousands)	Operating Leases
2023	$	418
2024	1,759
2025	1,806
2026	1,854
2027 and thereafter	2,550
Total lease payments	8,387
Less: imputed interest	(1,337)
Present value of lease liabilities	$	7,050

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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of equity-based compensation expense related to restricted stock and stock options

Stock-based compensation expense included in the condensed consolidated statements of operations for each of the periods presented is as follows:

	Three Months Ended March 31,
(in thousands)	2023		2022
Research and development	$	8,918	$	7,072
General and administrative	14,477		10,022
Total stock-based compensation expense	$	23,395	$	17,094

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Net Loss per Share (Tables)

3 Months Ended

Mar. 31, 2023

Earnings Per Share [Abstract]

Schedule of potential common shares not included in the calculation of the diluted net loss per share

The table below provides potentially dilutive securities not included in the computation of the diluted net loss per share for the periods ended March 31, 2023 and March 31, 2022, because to do so would be anti-dilutive:

	As of March 31,
	2023	2022
Common stock options issued and outstanding	11,619,559	7,832,865
Restricted stock units subject to future vesting	1,703,188	459,614
Restricted stock awards subject to future vesting	165,303	398,510
Total potentially dilutive securities	13,488,050	8,690,989

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Nature of Operations (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accumulated deficit	$ (643,350)	$ (569,930)
Working capital	499,900	548,700
Cash, cash equivalents and marketable securities	$ 528,100	$ 597,000

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Basis of Presentation (Details)	3 Months Ended
	Mar. 31, 2023 segment
Accounting Policies [Abstract]
Number of operating segments	1

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Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
U.S. government securities
Amortized Cost	$ 425,902	$ 530,283
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(162)	(767)
Estimated Fair Value	425,740	529,516
Short-term Investments | U.S. government securities
U.S. government securities
Amortized Cost	197,173	232,229
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(96)	(690)
Estimated Fair Value	197,077	231,539
Short-term Investments | Non-U.S. government securities
U.S. government securities
Amortized Cost	1,996	9,388
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(5)	(31)
Estimated Fair Value	1,991	9,357
Short-term Investments | Corporate debt securities
U.S. government securities
Amortized Cost	39,140	45,710
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(61)	(44)
Estimated Fair Value	39,079	45,666
Short-term Investments | Commercial paper
U.S. government securities
Amortized Cost	187,593	238,160
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 187,593	238,160
Long Term Investments | Corporate debt securities
U.S. government securities
Amortized Cost		4,796
Gross Unrealized Gains		0
Gross Unrealized Losses		(2)
Estimated Fair Value		$ 4,794

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Fair Value Measurements (Details) - Recurring - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value Measurements
Total financial assets	$ 465,519	$ 552,010
U.S. government securities
Fair Value Measurements
Short-term investments	197,076	231,539
Non-U.S. government securities
Fair Value Measurements
Short-term investments	1,991	9,357
Corporate debt securities
Fair Value Measurements
Short-term investments	39,079	45,666
Long term investments		4,794
Commercial paper
Fair Value Measurements
Short-term investments	187,593	238,160
Money market funds
Fair Value Measurements
Cash equivalents	39,780	22,494
Corporate debt securities
Fair Value Measurements
Cash equivalents	0	0
Level 1
Fair Value Measurements
Total financial assets	236,856	254,033
Level 1 | U.S. government securities
Fair Value Measurements
Short-term investments	197,076	231,539
Level 1 | Non-U.S. government securities
Fair Value Measurements
Short-term investments	0	0
Level 1 | Corporate debt securities
Fair Value Measurements
Short-term investments	0	0
Long term investments		0
Level 1 | Commercial paper
Fair Value Measurements
Short-term investments	0	0
Level 1 | Money market funds
Fair Value Measurements
Cash equivalents	39,780	22,494
Level 1 | Corporate debt securities
Fair Value Measurements
Cash equivalents	0	0
Level 2
Fair Value Measurements
Total financial assets	228,663	297,977
Level 2 | U.S. government securities
Fair Value Measurements
Short-term investments	0	0
Level 2 | Non-U.S. government securities
Fair Value Measurements
Short-term investments	1,991	9,357
Level 2 | Corporate debt securities
Fair Value Measurements
Short-term investments	39,079	45,666
Long term investments		4,794
Level 2 | Commercial paper
Fair Value Measurements
Short-term investments	187,593	238,160
Level 2 | Money market funds
Fair Value Measurements
Cash equivalents	0	0
Level 2 | Corporate debt securities
Fair Value Measurements
Cash equivalents	0	0
Level 3
Fair Value Measurements
Total financial assets	0	0
Level 3 | U.S. government securities
Fair Value Measurements
Short-term investments	0	0
Level 3 | Non-U.S. government securities
Fair Value Measurements
Short-term investments	0	0
Level 3 | Corporate debt securities
Fair Value Measurements
Short-term investments	0	0
Long term investments		0
Level 3 | Commercial paper
Fair Value Measurements
Short-term investments	0	0
Level 3 | Money market funds
Fair Value Measurements
Cash equivalents	0	0
Level 3 | Corporate debt securities
Fair Value Measurements
Cash equivalents	$ 0	$ 0

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Collaboration, Licensing and Variable Interest Entities (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended					3 Months Ended
	Jan. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Schedule of Equity Method Investments
Equity investment						$ 5,714		$ 4,193
Additional investment						2,800	$ 0
Equity investment loss						$ 1,278	337
Common stock, par value (usd per share)						$ 0.0001		$ 0.0001
Common stock, value, issued						$ 6		$ 6
Private Placement | GSK
Schedule of Equity Method Investments
Sale of stock (in shares)		2,050,819
Common stock, par value (usd per share)		$ 0.0001
Sale of stock, consideration received on transaction		$ 75,000
Sale of stock, price per share (usd per share)		$ 36.57
Premium rate paid on weighted average share price (percent)		25.00%
Premium term (days)		30 days
Common stock, value, issued		$ 55,500
Other liabilities		$ 19,500
MapKure
Schedule of Equity Method Investments
Equity investment						5,700
Equity investment loss						$ 1,300	$ 300
Series A Preferred Units | MapKure
Schedule of Equity Method Investments
Shares acquired (in shares)				3,500,000	3,500,000
Ownership interest (in percent)				38.90%	25.00%	38.90%
Equity investment				$ 3,500	$ 3,500
Series B Preferred Stock | MapKure
Schedule of Equity Method Investments
Shares acquired (in shares)			4,200,000
Additional investment			$ 4,200
Purchase obligation (in shares)	2,800,000
Unfunded obligation						$ 2,800

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Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Payables and Accruals [Abstract]
Accrued professional fees	$ 1,525	$ 1,780
Accrued compensation and benefits	9,133	19,142
Accrued research and development	12,009	12,321
Accrued other	6,020	5,999
Total accrued expenses	$ 28,687	$ 39,242

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Commitments and Contingencies - Narrative (Details)	1 Months Ended	3 Months Ended
	Mar. 31, 2023 option	Mar. 31, 2023 USD ($) option	Jan. 31, 2022 USD ($) option
Loss Contingencies [Line Items]
Litigation or contingency expense | $		$ 0
Stamford, CT
Loss Contingencies [Line Items]
Tenant allowance | $			$ 500,000
Annual increase in lease payments (as a percent)			0.025
Stamford, CT | Option One
Loss Contingencies [Line Items]
Number of renewal options			2
Renewal term (in years)			5 years
Stamford, CT | Option Two
Loss Contingencies [Line Items]
Number of renewal options			1
Renewal term (in years)			10 years
Research Triangle Park
Loss Contingencies [Line Items]
Number of renewal options	2	2
Renewal term (in years)	5 years	5 years
Lease term (in years)	5 years	5 years
Research Triangle Park | Minimum
Loss Contingencies [Line Items]
Number of years the lease payments will increase	4 years
Research Triangle Park | Maximum
Loss Contingencies [Line Items]
Number of years the lease payments will increase	5 years
Durham, NC
Loss Contingencies [Line Items]
Annual increase in lease payments (as a percent)	0.030	0.030

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Commitments and Contingencies - Maturities of operating lease liabilities (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Operating Leases
2023	$ 418
2024	1,759
2025	1,806
2026	1,854
2027 and thereafter	2,550
Total lease payments	8,387
Less: imputed interest	(1,337)
Present value of lease liabilities	$ 7,050

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Stock-Based Compensation - 2019 Equity Incentive Plan (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 05, 2023	Jun. 30, 2019	Mar. 31, 2023	Dec. 31, 2019
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock awards vested (in shares)			140,575
Award vesting rights, percentage	25.00%
CEO | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Granted (in shares)	284,362
Vesting period (in years)	4 years
2019 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of annual increase in the shares				5.00%
Shares available for future issuance (in shares)			4,332,038
2019 Equity Incentive Plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Exercise of stock options (in shares)			30,913
Stock options vested and exercisable (in shares)			4,926,147
Unrecognized compensation expense related to unvested stock options			$ 168.9
Unrecognized compensation expense expected to be recognized over a weighted-average remaining period (in years)			2 years 10 months 6 days
Stock options outstanding (in shares)			11,619,559
2019 Equity Incentive Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Unrecognized compensation expense related to restricted stock awards			$ 43.8
Unrecognized compensation expense expected to be recognized over a weighted-average remaining period (in years)			2 years 6 months 3 days
Unvested restricted stock award outstanding (in shares)			1,703,188,000,000
2019 Equity Incentive Plan | Restricted stock awards subject to future vesting
Share-based Compensation Arrangement by Share-based Payment Award
Unrecognized compensation expense related to restricted stock awards			$ 8.8
Unrecognized compensation expense expected to be recognized over a weighted-average remaining period (in years)			1 year 3 months 14 days
Unvested restricted stock award outstanding (in shares)			165,303
2019 Equity Incentive Plan | Restricted stock awards subject to future vesting | Employees
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock awards vested (in shares)			55,417
2019 Equity Incentive Plan | Executive officers and employees | Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Granted (in shares)			2,496,476
2019 Equity Incentive Plan | Executive officers and employees | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock awards vested (in shares)			1,175,681
CEO Performance Award | Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Stock options vested and exercisable (in shares)			11,025
CEO Performance Award | CEO | Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Granted (in shares)		176,411

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Stock-Based Compensation - Equity-based compensation expense related to restricted stock and stock options (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Share-based Payment Arrangement, Expensed and Capitalized, Amount
Total stock-based compensation expense	$ 23,395	$ 17,094
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount
Total stock-based compensation expense	8,918	7,072
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount
Total stock-based compensation expense	$ 14,477	$ 10,022

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Net Loss per Share (Details) - shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share
Total potentially dilutive securities (in shares)	13,488,050	8,690,989
Common stock options issued and outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share
Total potentially dilutive securities (in shares)	11,619,559	7,832,865
Restricted stock units subject to future vesting
Antidilutive Securities Excluded from Computation of Earnings Per Share
Total potentially dilutive securities (in shares)	1,703,188	459,614
Restricted stock awards subject to future vesting
Antidilutive Securities Excluded from Computation of Earnings Per Share
Total potentially dilutive securities (in shares)	165,303	398,510