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

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)


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

For the quarterly period ended March 31, 2025


☐	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: 001-39856

CULLINAN THERAPEUTICS, INC.

(Exact name of Registrant as specified in its Charter)


Delaware	81-3879991
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

One Main Street Suite 1350 Cambridge, MA	02142
(Address of principal executive offices)	(Zip Code)

(617) 410-4650

(Registrant’s telephone number, including area code)

Not Applicable

(Former name, former address and former fiscal year, if changed since last report)

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


Title of each class	Trading Symbol	Name of each exchange on which registered
Common Stock, par value $0.0001 per share	CGEM	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 ☒ NO ☐

Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit such files). YES ☒ NO ☐

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


Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	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 ☒

The number of shares of the Registrant’s common stock outstanding as of April 30, 2025 was 59,014,667.

Table of Contents


		Page
PART I.	FINANCIAL INFORMATION
Item 1.	Financial Statements (unaudited)	1
	Consolidated Balance Sheets	1
	Consolidated Statements of Operations and Comprehensive Income (Loss)	2
	Consolidated Statements of Stockholders’ Equity	3
	Consolidated Statements of Cash Flows	4
	Notes to the Consolidated Financial Statements	5
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	12
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	18
Item 4.	Controls and Procedures	18

PART II.	OTHER INFORMATION
Item 1.	Legal Proceedings	19
Item 1A.	Risk Factors	19
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	19
Item 3.	Defaults Upon Senior Securities	19
Item 4.	Mine Safety Disclosures	19
Item 5.	Other Information	19
Item 6.	Exhibits	20
	Signatures	21

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q contains forward-looking statements which are made pursuant to the safe harbor provisions of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, that involve risks, uncertainties, and other factors that may cause actual results, levels of activity, performance, or achievements to be materially different from the information expressed or implied by these forward-looking statements. All statements, other than statements of historical facts, contained in this Quarterly Report on Form 10-Q, including statements regarding our strategy, future operations, future financial position, future revenue, projected costs, prospects, plans and objectives of management, and expected market growth are forward-looking statements. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “plan,” “potential,” “predict,” “project,” “should,” “target,” “would”, and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words.

Any forward-looking statements in this Quarterly Report on Form 10-Q reflect our current views with respect to future events or to our 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 listed in our Annual Report on Form 10-K for the year ended December 31, 2024 (the "2024 10-K") and other filings with the Securities and Exchange Commission (the “SEC”), including the following:

•

the commercial success, cost of development, and timing of the approval of our clinical-stage product candidates;

•

the initiation, timing, progress, results, and cost of our research and development programs, and our current and future preclinical studies and clinical trials, including statements regarding the timing of initiation and completion of studies or clinical trials and related preparatory work, and the period during which the results of the trials will become available;

•

our ability to submit, and obtain clearance of, any global regulatory filings, including investigational new drug applications, on our expected timelines, or at all;

•

our ability to initiate, recruit, and enroll patients in and conduct our clinical trials at the pace that we project;

•

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

•

the effect of changes in global economic conditions, including uncertainties related to international trade policies, tariffs and supply chain dynamics, on our business and operations, including our expenses, supply chain, manufacturing processes, preclinical studies, and clinical trials;

•

our ability to compete with companies currently marketing therapies or developing product candidates with targets or indications similar to our product candidates’ targets or indications;

•

our reliance on third parties to conduct our clinical trials and to manufacture drug substance and drug product for use in our clinical trials;

•

the size and growth potential of the markets for any of our current and future product candidates, and our ability to serve those markets;

•

our ability to identify and advance through clinical development any additional product candidates;

•

the commercialization of our current and future product candidates, if approved, including our ability to successfully build a specialty sales force and commercial infrastructure to market our current and future product candidates;

•

our ability to identify research priorities and apply a risk-mitigated strategy to efficiently discover and develop current and future product candidates;

•

our ability to retain and recruit key personnel;

•

our ability to obtain and maintain adequate intellectual property rights;

•

our expectations regarding government and third-party payor coverage, pricing, and reimbursement;

•

our estimates of our expenses, ongoing losses, capital requirements, the sufficiency of our current resources, and our needs for or ability to obtain additional financing;

•

the milestone payments that we may receive from Taiho Pharmaceutical Co., Ltd.;

•

potential investments in our pipeline and the potential for such product candidates;

•

the potential benefits of strategic collaboration agreements, our ability to enter into additional strategic collaborations or arrangements, and our ability to attract collaborators with development, regulatory, and commercialization expertise; and

•

developments and projections relating to our competitors or our industry.

These factors are discussed more fully in our 2024 10-K and elsewhere in this Quarterly Report on Form 10-Q and other reports we file with the SEC. We may not actually achieve the plans, intentions, or expectations disclosed in our forward-looking statements, and investors should not place undue reliance on our forward-looking statements. Actual results or events could differ materially from the plans, intentions, and expectations disclosed in the forward-looking statements we make. Our forward-looking statements do not reflect the potential impact of any future acquisitions, mergers, dispositions, joint ventures, or investments we may make or collaborations or strategic partnerships we may enter into.

You should read this Quarterly Report on Form 10-Q and the documents that we reference herein and have filed or incorporated by reference as exhibits hereto completely and with the understanding that our actual future results may be materially different from what we expect. We do not assume any obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

This Quarterly Report on Form 10-Q also contains estimates, projections, and other information concerning our industry, our business, and the markets for our product candidates. Information that is based on estimates, forecasts, projections, market research, or similar methodologies is inherently subject to uncertainties and actual events or circumstances may differ materially from events and circumstances that are assumed in this information. Unless otherwise expressly stated, we obtained this industry, business, market, and other data from our own internal estimates and research, as well as 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. While we are not aware of any misstatements regarding any third-party information presented in this Quarterly Report on Form 10-Q, their estimates, in particular, as they relate to projections, involve numerous assumptions, are subject to risks and uncertainties and are subject to change based on various factors, including those discussed under the section titled “Risk Factors” in our 2024 10-K and elsewhere in this Quarterly Report on Form 10-Q.

iii

PART I—FINANCIAL INFORMATION

Item 1. Financial Statements.

CULLINAN THERAPEUTICS, INC.

Consolidated Balance Sheets

(unaudited)

(in thousands, except share amounts)


	March 31, 2025			December 31, 2024
Assets
Current assets:
Cash and cash equivalents	$	76,655		$	83,005
Short-term investments		227,172			315,972
Prepaid expenses and other current assets		13,945			15,691
Total current assets		317,772			414,668
Property and equipment, net		607			683
Operating lease right-of-use assets		1,550			1,667
Other assets		366			366
Long-term investments		259,386			204,440
Total assets	$	579,681		$	621,824
Liabilities and Stockholders' Equity
Current liabilities:
Accounts payable	$	3,401		$	1,682
Accrued expenses and other current liabilities		22,601			27,663
Operating lease liabilities, current		1,347			1,302
Total current liabilities		27,349			30,647
Long-term liabilities:
Operating lease liabilities, net of current portion		493			849
Total liabilities		27,842			31,496
Commitments and contingencies (Note 9)
Stockholders' equity:
Preferred stock, $0.0001 par value, 10,000,000 shares authorized as of March 31, 2025 and December 31, 2024; 647,500 shares issued and outstanding as of March 31, 2025 and December 31, 2024		—			—
Common stock, $0.0001 par value, 150,000,000 shares authorized as of March 31, 2025 and December 31, 2024; 58,698,919 and 58,510,610 shares issued and outstanding as of March 31, 2025 and December 31, 2024, respectively		6			6
Additional paid-in capital		968,069			958,695
Accumulated other comprehensive income (loss)		505			(133	)
Accumulated deficit		(416,741	)		(368,240	)
Total Cullinan stockholders' equity		551,839			590,328
Noncontrolling interests		—			—
Total stockholders' equity		551,839			590,328
Total liabilities and stockholders' equity	$	579,681		$	621,824

See accompanying notes to the unaudited consolidated financial statements.

CULLINAN THERAPEUTICS, INC.

Consolidated Statements of Operations and Comprehensive INCOME (LOSS)

(unaudited)

(in thousands, except per share amounts)


	Three Months Ended March 31,
	2025			2024
Operating expenses:
Research and development	$	41,459		$	30,646
General and administrative		13,537			12,343
Total operating expenses		54,996			42,989
Loss from operations		(54,996	)		(42,989	)
Other income (expense):
Interest income		6,580			5,693
Other expense, net		(85	)		(44	)
Net loss		(48,501	)		(37,340	)
Net loss attributable to noncontrolling interests		—			(192	)
Net loss attributable to Cullinan	$	(48,501	)	$	(37,148	)

Comprehensive income (loss):
Net loss	$	(48,501	)	$	(37,340	)
Unrealized gain (loss) on investments		638			(202	)
Comprehensive loss		(47,863	)		(37,542	)
Comprehensive loss attributable to noncontrolling interests		—			(192	)
Comprehensive loss attributable to Cullinan	$	(47,863	)	$	(37,350	)

Basic and diluted net loss per share attributable to Cullinan:
Common stock	$	(0.74	)	$	(0.75	)
Preferred stock	$	(7.42	)	$	(7.51	)
Weighted-average shares used in computing basic and diluted net loss per share attributable to Cullinan:
Common stock		58,905			43,011
Preferred stock		648			648

See accompanying notes to the unaudited consolidated financial statements.

CULLINAN THERAPEUTICS, INC.

Consolidated Statements of STOCKHOLDERS’ EQUITY

(unaudited)

(in thousands, except share amounts)


	Preferred Stock				Common Stock				Additional Paid-In		Accumulated Other Comprehensive			Accumulated			Noncontrolling		Total Stockholders'
	Shares		Amount		Shares		Amount		Capital		Income (Loss)			Deficit			Interests		Equity
Balances at December 31, 2024		647,500	$	—		58,510,610	$	6	$	958,695	$	(133	)	$	(368,240	)	$	—	$	590,328
Issuance of common stock under equity-based compensation plans		—		—		188,309		—		—		—			—			—		—
Equity-based compensation		—		—		—		—		9,374		—			—			—		9,374
Unrealized gain on investments		—		—		—		—		—		638			—			—		638
Net loss		—		—		—		—		—		—			(48,501	)		—		(48,501	)
Balances at March 31, 2025		647,500	$	—		58,698,919	$	6	$	968,069	$	505		$	(416,741	)	$	—	$	551,839


	Preferred Stock				Common Stock				Additional Paid-In		Accumulated Other Comprehensive			Accumulated			Noncontrolling			Total Stockholders'
	Shares		Amount		Shares		Amount		Capital		Income (Loss)			Deficit			Interests			Equity
Balances at December 31, 2023		647,500	$	—		42,900,083	$	4	$	654,685	$	(129	)	$	(200,857	)	$	192		$	453,895
Issuance of common stock under equity-based compensation plans		—		—		165,562		—		1,085		—			—			—			1,085
Equity-based compensation		—		—		—		—		8,227		—			—			—			8,227
Unrealized loss on investments		—		—		—		—		—		(202	)		—			—			(202	)
Net loss		—		—		—		—		—		—			(37,148	)		(192	)		(37,340	)
Balances at March 31, 2024		647,500	$	—		43,065,645	$	4	$	663,997	$	(331	)	$	(238,005	)	$	—		$	425,665

See accompanying notes to the unaudited consolidated financial statements.

CULLINAN THERAPEUTICS, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited)

(in thousands)


	Three Months Ended March 31,
	2025			2024
Operating activities:
Net loss	$	(48,501	)	$	(37,340	)
Adjustments to reconcile net loss to net cash used in operating activities:
Equity-based compensation expense		9,374			8,227
Accretion on marketable securities		(2,311	)		(3,306	)
Depreciation and amortization		76			76
Changes in operating assets and liabilities:
Prepaid expenses and other assets		1,742			411
Accounts payable		1,720			1,214
Accrued expenses and other liabilities		(5,255	)		(7,529	)
Net cash used in operating activities		(43,155	)		(38,247	)
Investing activities:
Maturities of marketable securities		162,645			144,325
Purchase of marketable securities		(125,840	)		(131,369	)
Net cash provided by investing activities		36,805			12,956
Financing activities:
Issuance of common stock under equity-based compensation plans		—			1,085
Net cash provided by financing activities		—			1,085
Net decrease in cash and cash equivalents		(6,350	)		(24,206	)
Cash and cash equivalents at beginning of period		83,005			98,434
Cash and cash equivalents at end of period	$	76,655		$	74,228
SUPPLEMENTAL NONCASH DISCLOSURE
Non-cash investing and financing activities and supplemental cash flow information
Cash refunded for income taxes	$	—		$	(3,870	)

See accompanying notes to the unaudited consolidated financial statements.

CULLINAN THERAPEUTICS, INC.

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

(1)

Nature of Business and Basis of Presentation

Organization

Cullinan Therapeutics, Inc., together with its consolidated subsidiaries ("Cullinan" or the "Company"), is a clinical-stage biopharmaceutical company dedicated to creating new standards of care for patients that was incorporated in September 2016 and has a principal place of business in Cambridge, Massachusetts. In April 2024, the Company changed its name from Cullinan Oncology, Inc. to Cullinan Therapeutics, Inc.

Liquidity

The Company has a history of significant operating losses and has had negative cash flows from operations since its inception and expects to continue to generate operating losses for the foreseeable future. Cullinan’s ultimate success depends on the outcome of its research and development activities as well as its ability to commercialize the Company’s product candidates. Cullinan is subject to a number of risks including, but not limited to, the need to obtain adequate additional funding for the ongoing and planned clinical development of its product candidates. Due to the numerous risks and uncertainties associated with pharmaceutical products and development, the Company is unable to accurately predict the timing or amount of funds required to complete development of its product candidates, and costs could exceed Cullinan’s expectations for a number of reasons, including reasons beyond the Company’s control.

Since inception, Cullinan has funded its operations primarily through the sale of equity securities and from licensing or selling the rights to its product candidates. The Company expects that its cash, cash equivalents, and short-term investments of $303.8 million, and long-term investments and interest receivable of $263.6 million as of March 31, 2025, will be sufficient to fund its operating expenses and capital expenditure requirements through the next twelve months from the date of issuance of these consolidated financial statements.

(2)

Summary of Significant Accounting Policies

Cullinan’s significant accounting policies have not changed materially from those disclosed in its annual audited consolidated financial statements and accompanying notes in its Annual Report on Form 10-K for the fiscal year ended December 31, 2024 (the “2024 10-K”).

Basis of Presentation

The accompanying unaudited consolidated financial statements of the Company have been prepared in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) and in accordance with applicable rules and regulations of the Securities and Exchange Commission ("SEC") for interim financial reporting and include the accounts of Cullinan and its consolidated subsidiaries. Intercompany balances and transactions have been eliminated in consolidation.

In the opinion of Cullinan’s management, the unaudited consolidated financial statements reflect all adjustments, which are normal and recurring in nature, and necessary for fair financial statement presentation. The preparation of these unaudited consolidated financial statements and accompanying notes in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported. Actual results could differ materially from those estimates. These unaudited consolidated financial statements and accompanying notes should be read in conjunction with the Company’s annual audited consolidated financial statements and accompanying notes included in the 2024 10-K.

Recently Adopted Accounting Pronouncements

In December 2023, the Financial Accounting Standards Board ("FASB") issued an accounting standards update to enhance transparency about income tax information through improvements to income tax disclosures primarily related to the rate reconciliation and income taxes paid information. The main provisions in this update will require companies to disclose, on an annual basis, specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. This update will also require companies to disclose, on an annual basis, the amount of income taxes paid, income (or loss) from continuing operations before income tax expense (or benefit), and income tax expense (or benefit) from continuing operations, disaggregated by federal, state and foreign jurisdictions. This new standard is effective for fiscal years beginning after December 15, 2024. Cullinan adopted this standard on January 1, 2025.

Recently Issued Accounting Pronouncements

In November 2024, the FASB issued an accounting standards update to improve disclosures regarding the types of expenses included in commonly presented expense captions, including disaggregating the amounts of employee compensation, depreciation and amortization included within each income statement expense caption. This standard will be effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. Cullinan is evaluating the impact of adopting this new standard on its consolidated financial statements and disclosures.

(3)

Financial Instruments

Investments

Cullinan recognized its investments by security type at March 31, 2025 as follows (in thousands):


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments
Corporate notes	$	148,703	$	64	$	(49	)	$	148,718
U.S. government notes		78,380		78		(2	)		78,456
Total short-term investments		227,083		142		(51	)		227,174
Long-term investments
U.S. government notes		149,244		577		(16	)		149,805
Corporate notes		70,261		37		(209	)		70,089
Asset-backed securities		39,465		44		(19	)		39,490
Total long-term investments		258,970		658		(244	)		259,384
Total investments	$	486,053	$	800	$	(295	)	$	486,558

Cullinan recognized its investments by security type at December 31, 2024 as follows (in thousands):


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments
Corporate notes	$	211,584	$	343	$	(6	)	$	211,921
U.S. government notes		78,874		81		—			78,955
Asset-backed securities		25,084		12		—			25,096
Total short-term investments		315,542		436		(6	)		315,972
Long-term investments
U.S. government notes		118,423		88		(188	)		118,323
Corporate notes		77,196		9		(472	)		76,733
Asset-backed securities		9,384		—		—			9,384
Total long-term investments		205,003		97		(660	)		204,440
Total investments	$	520,545	$	533	$	(666	)	$	520,412

Fair Value of Financial Instruments

The following table sets forth the fair value of Cullinan’s financial assets that were measured at fair value on a recurring basis as of March 31, 2025 (in thousands):


	Level 1		Level 2		Level 3		Total
Short-term investments
Corporate notes	$	—	$	148,718	$	—	$	148,718
U.S. government notes		—		78,456		—		78,456
Total short-term investments		—		227,174		—		227,174
Long-term investments
U.S. government notes		—		149,805		—		149,805
Corporate notes		—		70,089		—		70,089
Asset-backed securities		—		39,490		—		39,490
Total long-term investments		—		259,384		—		259,384
Total investments	$	—	$	486,558	$	—	$	486,558

The following table sets forth the fair value of the Company’s financial assets that were measured at fair value on a recurring basis as of December 31, 2024 (in thousands):


	Level 1		Level 2		Level 3		Total
Short-term investments
Corporate notes	$	—	$	211,921	$	—	$	211,921
U.S. government notes		—		78,955		—		78,955
Asset-backed securities		—		25,096		—		25,096
Total short-term investments		—		315,972		—		315,972
Long-term investments
U.S. government notes		—		118,323		—		118,323
Corporate notes		—		76,733		—		76,733
Asset-backed securities		—		9,384		—		9,384
Total long-term investments		—		204,440		—		204,440
Total investments	$	—	$	520,412	$	—	$	520,412

As of March 31, 2025 and December 31, 2024, the fair values of Cullinan's cash and cash equivalents, prepaid expenses and other current assets, accounts payable, accrued expenses and other current liabilities approximated their carrying values due to the short-term nature of these instruments.

(4)

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following as of March 31, 2025 and December 31, 2024 (in thousands):


	March 31, 2025		December 31, 2024
Contracted research and development expenses	$	12,395	$	10,297
Due to Taiho under collaboration agreement, net		4,715		5,994
Employee compensation		2,696		9,935
Other current liabilities		2,795		1,437
Total accrued expenses and other current liabilities	$	22,601	$	27,663

(5)

License and Collaboration Agreements

Harbour License Agreement

The Company and Harbour BioMed US Inc. (“Harbour”) were party to a license and collaboration agreement pursuant to which Harbour granted to Cullinan an exclusive license for the development, manufacturing and commercialization of HBM7008 (CLN-418) in the U.S. In August 2024, following a review of the data from the Phase 1 clinical trial of CLN-418, the Company notified Harbour of its decision to terminate the license and collaboration agreement, effective November 2024. In connection with the termination, the Company discontinued development of CLN-418 and returned development and commercial rights for CLN-418 to Harbour.

Taiho Agreements

Cullinan has a co-development agreement with an affiliate of Taiho Pharmaceutical Co., Ltd ("Taiho"), pursuant to which the Company is collaborating to develop zipalertinib and has the option to co-commercialize zipalertinib in the U.S. Development costs for zipalertinib are shared equally between Taiho and the Company with each party receiving 50% of any future pre-tax profits from potential U.S. sales of zipalertinib.

The Company concluded that the co-development agreement with Taiho is a collaborative arrangement because Cullinan is an active participant in the development of zipalertinib. Payments made to or received from Taiho for zipalertinib development activities after the execution of the co-development agreement are recorded within research and development expenses and general and administrative expenses. For the three months ended March 31, 2025 and 2024, the Company recorded $5.6 million and $6.0 million, respectively, related to its share of research and development costs incurred by Taiho. The Company recorded $0.5 million for the three months ended March 31, 2025 related to its share of general and administrative costs incurred by Taiho. Cullinan incurred $1.4 million and $1.9 million of costs that were reimbursable by Taiho for the three months ended March 31, 2025 and 2024, respectively, which were recorded as a reduction to research and development expenses. The net amounts of $4.7 million and $6.0 million due to Taiho as of March 31, 2025 and December 31, 2024, respectively, were recorded within accrued expenses and other current liabilities.

Cullinan is also eligible to receive up to $130.0 million from Taiho tied to epidermal growth factor receptor exon 20 non-small-cell lung cancer U.S. regulatory milestones.

Other License and Collaboration Agreements

The Company has certain payment obligations that are contingent upon future events under various other license and collaboration agreements. Under these agreements, Cullinan will be required to make milestone payments upon successful completion and achievement of certain intellectual property, clinical, regulatory, and sales milestones and will be required to make royalty payments in connection with the sale of products developed under these agreements. During each of the three months ended March 31, 2025 and 2024, no milestones were achieved under the Company’s other license and collaboration agreements.

(6)

Stockholders' Equity

Common Stock

Each share of common stock entitles the holder to one vote and to receive dividends when and if declared by the board of directors of the Company. No dividends have been declared through March 31, 2025.

2024 Private Placement

In April 2024, Cullinan completed the 2024 Private Placement in which Cullinan issued approximately 14.4 million shares of its common stock and pre-funded warrants to purchase approximately 0.3 million additional shares of its common stock. Cullinan received net proceeds of $262.7 million from the 2024 Private Placement, after deducting offering costs of $17.3 million. Refer to the discussion under the heading “Warrants” below for further detail regarding the pre-funded warrants.

At-the-Market Equity Offering Program

Cullinan has an at-the-market equity offering program (the “ATM") through an agreement with Cowen and Company, LLC ("Cowen") pursuant to which the Company may offer and sell up to $125.0 million of its common stock from time to time through Cowen, acting as its sales agent. The Company made no sales under the ATM in the three months ended March 31, 2025. Through March 31, 2025, the Company has sold approximately 3.3 million shares under the ATM and received net proceeds of $38.4 million after deducting commissions. As of March 31, 2025, Cullinan had $85.6 million in shares of its common stock remaining under the ATM.

Preferred Stock

Each share of preferred stock is convertible into ten shares of common stock at the option of the holder at any time, subject to certain limitations, including that the holder is prohibited from converting preferred stock into common stock if, as a result of such conversion, the holder, together with its affiliates, would beneficially own a number of shares of common stock more than 9.99% of the total common stock then issued and outstanding immediately following the conversion of such shares of preferred stock. Holders of the preferred stock are permitted to increase this percentage to an amount not to exceed 19.99% upon 60 days notice.

Shares of preferred stock generally have no voting rights, except as required by law and except that the consent of a majority of the holders of the outstanding preferred stock will be required to amend the terms of the preferred stock. In the event of the Company’s liquidation, dissolution or winding up, holders of preferred stock will participate pari passu with any distribution of proceeds to holders of common stock. Holders of preferred stock are entitled to receive when, as, and if dividends are declared and paid on the common stock, an equivalent dividend, calculated on an as-converted basis. Shares of preferred stock are otherwise not entitled to dividends.

The preferred stock ranks (i) senior to any class or series of capital stock of Cullinan hereafter created specifically ranking by its terms junior to the preferred stock; (ii) on parity with the common stock and any class or series of capital stock of the Company created specifically ranking by its terms on parity with the preferred stock; and (iii) junior to any class or series of capital stock of Cullinan created specifically ranking by its terms senior to any preferred stock, in each case, as to distributions of assets upon liquidation, dissolution or winding up of the Company, whether voluntarily or involuntarily.

The Company determined that the preferred stock should be classified as permanent equity.

Noncontrolling Interests

Certain of the Company's clinical-stage product candidates are held through development subsidiaries in which the Company has controlling interests. These development subsidiaries have issued common stock and preferred stock to the Company and to third parties. The holders of subsidiary common stock and preferred stock are generally entitled to one vote per share. The holders of subsidiary common stock are entitled to receive dividends when and if declared by the subsidiaries’ board of directors and distributions in either case only after the payment of all preferential amounts required to be paid to the holders of shares of preferred stock of the respective subsidiary. The following table shows the Company’s ownership interest as of March 31, 2025 and December 31, 2024, respectively, in product candidates in which the Company has a controlling interest:


	Ownership Interest as of
Product Candidate	March 31, 2025	December 31, 2024
CLN-619	99%	99%
CLN-049	98%	98%
CLN-617	96%	96%

Warrants

As of March 31, 2025, the Company had potentially issuable shares of common stock related to unexercised pre-funded warrants to purchase 0.3 million shares of the Company’s common stock at an exercise price of $0.001 per share. The pre-funded warrants may be exercised at the option of the holder at any time, subject to certain limitations. The exercise price and the number of shares are subject to adjustment for certain dividend payments and upon reclassification, exchange, combination or substitution of the shares of common stock. The pre-funded warrants expire in April 2054 if they have not been exercised by that time.

Cullinan determined that the pre-funded warrants should be equity-classified. The Company also determined that the pre-funded warrants should be included in the weighted-average shares used in computing basic net loss per share attributable to common stockholders of Cullinan.

(7)

Equity-Based Compensation

Cullinan recorded equity-based compensation in the following expense categories in the consolidated statements of operations and comprehensive income (loss) for the three months ended March 31, 2025 and 2024 (in thousands):


	Three Months Ended March 31,
	2025		2024
General and administrative	$	5,445	$	5,092
Research and development		3,929		3,135
Total equity-based compensation	$	9,374	$	8,227

(8)

Royalty Transfer Agreements

The Company's CLN-619, CLN-049, and CLN-617 development subsidiaries are each party to royalty transfer agreements with two charitable foundations. Under these royalty transfer agreements, the charitable foundations are collectively entitled to receive a low single digit royalty percentage of all global net sales of any products developed by the applicable subsidiary, subject to limitations after patent expirations and on intellectual property developed after a change of control. Cullinan has deemed these royalty transfer agreements to be freestanding financial instruments that should be accounted for at fair value. The Company concluded that these instruments had no value at the inception of the agreements.

Cullinan has not had any applicable net sales from its products and as a result, has not paid or incurred any royalties under these agreements as of March 31, 2025. Given the early-stage nature of the underlying technologies and inherent technical, regulatory and competitive risks associated with achieving approval and commercialization, the Company ascribed no value to the royalty transfer agreements as of March 31, 2025 and December 31, 2024.

(9)

Commitments and Contingencies

The Company enters into contracts in the normal course of business with contract research organizations, contract manufacturing organizations, and other third parties for preclinical research studies, clinical trials and testing and manufacturing services. These agreements generally include cancellation clauses.

Indemnification Agreements

In the ordinary course of business, Cullinan may provide indemnification of varying scope and terms to vendors, lessors, business partners and other parties with respect to certain matters including, but not limited to, losses arising out of breach of such agreements or from intellectual property infringement claims made by third parties. In addition, the Company has entered into indemnification agreements with members of its board of directors and executive officers that will require Cullinan, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors or officers. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is, in certain cases, unlimited. To date, Cullinan has not incurred any material costs as a result of such indemnifications. The Company is not aware of any indemnification arrangements that could have a material effect on its financial position, results of operations or cash flows, and it has not accrued any liabilities related to such obligations in its consolidated financial statements as of March 31, 2025 and December 31, 2024.

Legal Proceedings

Cullinan is not currently party to, or aware of, any material legal proceedings. At each reporting date, the Company evaluates whether or not a potential loss amount or a potential range of loss is probable and reasonably estimable under the provisions of the authoritative guidance that addresses accounting for contingencies. Cullinan expenses as incurred the costs related to such legal proceedings.

(10)

Leases

Cullinan has an operating lease for approximately 14,000 square feet of office space in a multi-tenant building in Cambridge, Massachusetts, which commenced in August 2022 and goes through July 2026. The Company also had an operating lease for approximately 8,000 square feet of office space in a multi-tenant building in Cambridge, Massachusetts, which commenced in February 2018 and expired in June 2024. Lease expense consisted of operating lease costs of $0.3 million for each of the three months ended March 31, 2025 and 2024, respectively.

The following table summarizes supplemental cash flow information for the three months ended March 31, 2025 and 2024 (in thousands):


	Three Months Ended March 31,
	2025		2024
Cash paid for amounts included in measurement of lease liabilities:
Operating cash flows from operating leases	$	363	$	510

The following table summarizes the Company’s future minimum lease payments as of March 31, 2025 (in thousands):


	March 31, 2025
Remainder of 2025	$	1,098
2026		872
Total future minimum lease payments		1,970
Less: imputed interest		(130	)
Total lease liabilities at present value	$	1,840

The following table summarizes the weighted-average remaining lease term and discount rate as of March 31, 2025 and December 31, 2024:


	March 31, 2025			December 31, 2024
Weighted-average remaining lease term (in years)		1.3			1.6
Weighted-average discount rate		11.0	%		11.0	%

(11)

Net Loss per Share Attributable to Cullinan

The Company computes net loss per share attributable to Cullinan for its common stock and preferred stock using the two-class method required for multiple classes of common stock. The two-class method is an earnings (loss) allocation method under which earnings (loss) per share is calculated for each class of common stock.

The following table sets forth the calculation of basic and diluted net loss per share attributable to Cullinan for the three months ended March 31, 2025 and 2024 (in thousands, except per share data):


	Three Months Ended March 31, 2025						Three Months Ended March 31, 2024
	Common Stock			Preferred Stock			Common Stock			Preferred Stock
Numerator:
Net loss attributable to Cullinan - basic and diluted	$	(43,698	)	$	(4,803	)	$	(32,287	)	$	(4,861	)
Denominator:
Weighted-average shares outstanding — basic and diluted		58,905			648			43,011			648
Net loss per share attributable to Cullinan:
Basic and diluted	$	(0.74	)	$	(7.42	)	$	(0.75	)	$	(7.51	)

Cullinan used the treasury stock method for equity awards and the if converted method for preferred stock to determine the number of dilutive shares outstanding in each period. There were no securities that were potentially dilutive to the preferred stockholders of Cullinan during each of the three months ended March 31, 2025 and 2024. The following table sets forth potential common shares that were excluded from the computation of diluted net loss per share attributable to common stockholders of Cullinan for the three months ended March 31, 2025 and 2024 because their effect would have been anti-dilutive (in thousands):


	Three Months Ended March 31,
	2025		2024
Stock options		12,076		10,155
Preferred stock		6,475		6,475
Restricted stock units		986		520
Employee stock purchase plan		10		4
Total		19,547		17,154

(12)

Segment Reporting

The Company operates and manages the business as one reporting and one operating segment, which is the business of developing immunology and oncology therapies. Cullinan has determined that its Chief Executive Officer is the chief operating decision maker (“CODM”). Cullinan’s CODM reviews financial information on an aggregate basis and uses net loss attributable to Cullinan as presented in the consolidated statement of operations and comprehensive income (loss) for purposes of allocating resources and evaluating financial performance.

Financial information of the Company’s reportable segment for the three months ended March 31, 2025 and 2024 are as follows (in thousands):


	Three Months Ended March 31,
	2025			2024
Research and development ("R&D") programs:
CLN-978	$	4,673		$	1,503
CLN-619		6,118			4,286
Zipalertinib		10,160			8,288
CLN-049		3,895			1,476
CLN-617		1,793			1,012
CLN-418		—			3,072
Early-stage programs		1,022			1,361
Total R&D program expense		27,661			20,998
Equity-based compensation		9,374			8,227
R&D personnel and operations		9,831			6,488
G&A personnel		3,489			3,952
License agreement obligations		38			25
Other segment expenses(1)		4,603			3,299
Loss from operations		(54,996	)		(42,989	)
Other income (expense):
Interest income		6,580			5,693
Other income (expense), net		(85	)		(44	)
Net loss		(48,501	)		(37,340	)
Net loss attributable to noncontrolling interests		—			(192	)
Net loss attributable to Cullinan	$	(48,501	)	$	(37,148	)

(1)

Other segment expenses for the three months ended March 31, 2025 and 2024 include legal fees relating to patent and corporate matters; professional fees for accounting, auditing, tax, and administrative consulting services; insurance costs; marketing expenses; depreciation; and other operating costs.

All of the Company’s long-lived assets were located in the U.S. as of each of March 31, 2025 and 2024. There were no expenditures for long-lived assets in each of the three months ended March 31, 2025 and 2024.

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

You should read the following discussion and analysis of our financial condition and results of operations together with our unaudited consolidated financial statements and the related notes appearing elsewhere in this Quarterly Report on Form 10-Q and our audited financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2024 (the “2024 10-K”), filed with the Securities and Exchange Commission (the “SEC”) on March 14, 2024. This discussion and other parts of this Quarterly Report on Form 10-Q contain forward-looking statements that involve risks and uncertainties, such as statements regarding our plans, objectives, expectations, intentions and projections. Our actual results could differ materially from those discussed in these forward-looking statements. Please also refer to those factors described in “Part I, Item 1A. Risk Factors” of our 2024 10-K and "Part II. Item 1A. Risk Factors" in this Quarterly Report on Form 10-Q for important factors that we believe could cause actual results to differ materially from those in our forward-looking statements.

Overview

We are a clinical-stage biopharmaceutical company dedicated to creating new standards of care for patients. Our strategy is to identify high-impact targets, which we define as those that inhibit key drivers of disease or harness the immune system to eliminate diseased cells in both autoimmune diseases and cancer, and then select what we believe is the optimal therapeutic modality for those targets. We source innovation both internally and externally, focusing on product candidates with novel technology or differentiated mechanisms. Before we advance a product candidate into clinical development, we evaluate its potential for activity as a single agent as well as its ability to generate an immune response or to inhibit disease processes. Using this strategy, we have built a broad and deep pipeline of targeted immunology and oncology programs that includes multiple distinct clinical-stage product candidates.

Immunology

•

CLN-978 is a CD19xCD3 T cell engager that we are developing for autoimmune diseases. CLN-978 is being investigated in systemic lupus erythematosus (“SLE”), rheumatoid arthritis (“RA”) and Sjögren’s disease (“SjD”). Our global Phase 1 clinical trial in patients with moderate to severe SLE is ongoing, and we plan to share initial clinical data in the fourth quarter of 2025. In April 2025, we received approval from the European Medicines Agency to initiate a Phase 1 clinical trial in patients with active, difficult-to-treat RA. We expect to initiate the trial at Friedrich-Alexander University of Erlangen-Nuremberg in Germany and Università Cattolica del Sacro Cuore in Italy in the second quarter of 2025. In April 2025, we also announced our plans to develop CLN-978 in patients with SjD. We plan to initiate a Phase 1 clinical trial in the U.S. in patients with active, moderate to severe SjD in the second quarter of 2025.

Oncology

•

CLN-619 is a monoclonal antibody that stabilizes expression of MICA/B on the tumor cell surface to promote tumor cell lysis mediated by both cytotoxic innate and adaptive immune cells. Following a review of the data from the disease-specific expansion cohorts for endometrial and cervical cancers, we have discontinued further development of CLN-619 in patients with gynecological cancers as preliminary results did not meet our internal threshold for advancement. Our Phase 1 clinical trial of CLN-619 continues with the disease-specific expansion cohorts in patients with non-small cell lung cancer (“NSCLC”). We also continue to evaluate CLN-619 in a Phase 1 clinical trial in patients with relapsed/refractory multiple myeloma.

•

Zipalertinib (CLN-081/TAS6417), which we are co-developing with an affiliate of Taiho Pharmaceutical Co., Ltd ("Taiho"), is an orally-available small-molecule, irreversible epidermal growth factor receptor ("EGFR") inhibitor that is designed to selectively target cells expressing EGFR exon 20 insertion mutations (“EGFR ex20ins”) with relative sparing of cells expressing wild-type EGFR. We are evaluating zipalertinib in a pivotal Phase 2b portion of the REZILIENT1 clinical trial in patients with EGFR ex20ins NSCLC who progressed after prior systemic therapy. In January 2025, we announced the Phase 2b portion of the REZILIENT1 trial met the primary endpoint of overall response rate in patients with EGFR ex20ins NSCLC who have received prior therapy. The results will be presented during an oral abstract session at the 2025 ASCO Annual Meeting on June 1, 2025. Pending discussions with the U.S. Food and Drug Administration, Taiho plans to submit a new drug application for zipalertinib in relapsed/refractory EGFR ex20ins NSCLC in the second half of 2025. Taiho is evaluating zipalertinib in a global Phase 3 clinical trial (“REZILIENT3”) in combination with chemotherapy as a potential first-line treatment for EGFR ex20ins NSCLC adult patients.

•

CLN-049 is a FLT3xCD3 T cell engaging bispecific antibody. CLN-049 is being investigated in an ongoing Phase 1 clinical trial in patients with relapsed/refractory acute myeloid leukemia ("AML") or myelodysplastic syndrome. CLN-049 is also being evaluated in a Phase 1 clinical trial in patients with measurable minimal residual disease positive AML.

•

CLN-617 is a fusion protein combining two potent antitumor cytokines, interleukin-2 and interleukin-12, with tumor retention domains for the treatment of solid tumors. CLN-617 is being investigated in a Phase 1 clinical trial in patients with advanced solid tumors.

Preclinical Programs

In addition to the product candidates described above, we are actively developing several preclinical programs by leveraging our own internal expertise and through partnerships with external collaborators.

Recently Discontinued Program

Previously, we were evaluating CLN-418, a fully human bispecific immune activator targeting B7H4 and 4-1BB that we licensed from Harbour BioMed US Inc (“Harbour”) in a Phase 1 clinical trial. In August 2024, following a review of the data from the Phase 1 clinical trial, we notified Harbour of our decision to terminate the license and collaboration agreement for CLN-418 (the “Harbour License Agreement”), effective November 2024. In connection with the termination of the Harbour License Agreement, we discontinued development of CLN-418 and returned development and commercial rights for CLN-418 to Harbour to focus our resources on our other product candidates.

Intellectual Property

We hold the worldwide intellectual property rights for CLN-978, and we hold the worldwide intellectual property rights or exclusive options for worldwide intellectual property for our earlier-stage programs. We have a controlling interest in the worldwide intellectual property rights for CLN-619, CLN-049, and CLN-617. We are co-developing zipalertinib, for which Taiho holds the intellectual property rights, with an affiliate of Taiho. The following table shows our ownership interest as of December 31, 2024 in product candidates in which we have a controlling interest in the worldwide intellectual property rights:


Product Candidate		Ownership Interest as of March 31, 2025
CLN-619		99%
CLN-049		98%
CLN-617		96%

Financing and Business Operations

Since our inception in 2016, we have focused all of our efforts and financial resources on raising capital, organizing and staffing our company, identifying, acquiring or in-licensing and developing product and technology rights, establishing and protecting our intellectual property portfolio and developing and advancing our programs. We do not have any products approved for sale and have not generated any revenue from product sales.

We have funded our operations primarily through the sale of equity securities and from licensing or selling the rights to our product candidates. As of March 31, 2025, we have received net proceeds of $842.2 million from equity financings. We have received $18.9 million in revenue from a previous license agreement and cash proceeds of $275.0 million from the sale of our equity interest in our zipalertinib development subsidiary to Taiho.

As of March 31, 2025, we had cash, cash equivalents, and short-term investments of $303.8 million, and long-term investments and interest receivable of $263.6 million. Interest receivable is included in prepaid expenses and other current assets on the consolidated balance sheets and represents accrued and unpaid interest on our marketable securities. We have a history of significant operating losses and have had negative cash flows from operations since our inception. As of March 31, 2025, we had an accumulated deficit of $416.7 million. We expect to continue to generate operating losses for the foreseeable future. Our future viability is dependent on the success of our research and development and our ability to access additional capital to fund our operations. There can be no assurance that our current operating plan will be achieved or that additional funding will be available on terms acceptable to us, or at all.

We are subject to risks and uncertainties common to early-stage companies in the biotechnology industry including, but not limited to, new technological innovations, protection of proprietary technology, dependence on key personnel, compliance with government regulations and the ability to obtain additional capital to fund operations. Our current and future product candidates will require significant additional research and development efforts, including preclinical and clinical testing and regulatory approval prior to commercialization. These efforts require additional capital, adequate personnel and extensive compliance-reporting capabilities. There can be no assurance that our research and development will be successfully completed, that adequate protection for our intellectual property will be obtained, that any products developed will obtain necessary government regulatory approval or that any approved products will be commercially viable.

Global Economic Conditions

As we continue to pursue commercial opportunities in both U.S. and international markets, we remain attentive to evolving global economic conditions, including uncertainties related to international trade policies, tariffs, and supply chain dynamics. Although these factors have not had a material impact on our business to date, future changes in trade regulations or tariff structures could have an impact on our business and operations, including our expenses, supply chain, manufacturing processes, preclinical studies and clinical trials. We continue to monitor these developments closely.

Components of Our Results of Operations

Revenue

We have not generated any revenue from the sale of products since our inception and do not expect to generate any revenue from the sale of products in the near future, if at all.

Research and Development Expenses

Research and development expenses consist primarily of costs incurred in connection with the research and development of our product candidates and programs. These expenses include:

•

compensation costs for employees engaged in research and development functions;

•

expenses incurred under agreements with organizations that support our drug discovery and development activities;

•

expenses incurred in connection with the preclinical and clinical development of our product candidates and programs, including under agreements with contract research organizations ("CROs");

•

costs related to contract manufacturing organizations that are primarily engaged to provide drug substance, raw materials, and drug product for our clinical trials, research and development programs, as well as investigative sites and consultants that conduct our clinical trials, nonclinical studies, and other scientific development services;

•

the costs of acquiring and manufacturing nonclinical and clinical trial materials, including manufacturing registration and validation batches;

•

costs related to compliance with quality and regulatory requirements;

•

payments made under third-party licensing agreements; and

•

direct and allocated costs related to facilities, information technology, personnel and other overhead.

Development costs and any future potential pre-tax profits from U.S. sales of zipalertinib are shared equally between us and Taiho.

General and Administrative Expenses

General and administrative expenses consist primarily of compensation costs for personnel in executive management, finance, legal, corporate and business development, and other administrative functions. General and administrative expenses also include legal fees relating to patent and corporate matters; professional fees for accounting, auditing, tax, and administrative consulting services; insurance costs; administrative travel expenses; marketing expenses; and other operating costs.

Other Income

Other income consists primarily of interest income earned on our cash, cash equivalents, and investments.

Results of Operations

Comparison of the Three Months Ended March 31, 2025 and 2024

The following table presents our results of operations for the three months ended March 31, 2025 and 2024 (in thousands):


	Three Months Ended March 31,
	2025			2024
Operating expenses:
Research and development	$	41,459		$	30,646
General and administrative		13,537			12,343
Total operating expenses		54,996			42,989
Loss from operations		(54,996	)		(42,989	)
Other income (expense):
Interest income		6,580			5,693
Other expense, net		(85	)		(44	)
Net loss		(48,501	)		(37,340	)
Net loss attributable to noncontrolling interests		—			(192	)
Net loss attributable to Cullinan	$	(48,501	)	$	(37,148	)

Research and Development Expenses

In the fourth quarter of 2024, we began disclosing research and development personnel costs without the effect of intercompany allocations to product candidates held by our development subsidiaries and also began disclosing license agreement obligations separately from the related product candidate. We have recast prior period financial information to conform to the new presentation. The following table summarizes our research and development expenses for the three months ended March 31, 2025 and 2024 (in thousands):


	Three Months Ended March 31,
	2025		2024
CLN-978	$	4,673	$	1,503
CLN-619		6,118		4,286
Zipalertinib		10,160		8,288
CLN-049		3,895		1,476
CLN-617		1,793		1,012
CLN-418		—		3,072
Clinical-stage product candidates		26,639		19,637
Early-stage research		1,022		1,361
Research and development personnel and operations		9,831		6,488
License agreement obligations		38		25
Equity-based compensation		3,929		3,135
Total research and development expenses	$	41,459	$	30,646

The $10.8 million increase in research and development expenses in the three months ended March 31, 2025 compared to the same period in 2024 was primarily due to increases in clinical costs ($6.0 million), personnel costs relating to additional headcount ($3.4 million), equity-based compensation costs ($0.8 million), and chemistry, manufacturing and controls costs ($0.5 million).

General and Administrative Expenses

The $1.2 million increase in general and administrative expenses in the three months ended March 31, 2025 compared to the same period in 2024 was primarily due to increases in legal costs ($0.6 million), other professional fees ($0.5 million), and equity-based compensation costs ($0.4 million), partially offset by decreases in personnel costs ($0.5 million).

Other Income

The $0.8 million increase in other income for the three months ended March 31, 2025, compared to the same period in 2024 was primarily related to higher investment income.

Net Loss Attributable to Noncontrolling Interests

Net loss attributable to noncontrolling interests is determined as the difference in the noncontrolling interests in the consolidated balance sheets between the start and end of each reporting period, after taking into account any capital transactions between our development subsidiaries and third parties.

Liquidity and Capital Resources

Overview

We have a history of significant operating losses and have had negative cash flows from operations since our inception and expect to continue to generate operating losses for the foreseeable future. We have not yet commercialized any products, and we do not expect to generate revenue from sales of products for several years, if at all. To date, we have funded our operations primarily with proceeds from the sale of equity securities and from licensing or selling the rights to our product candidates. As of March 31, 2025, we had cash, cash equivalents, and short-term investments of $303.8 million, and long-term investments and interest receivable of $263.6 million.

Based on our current operational plans and assumptions, we expect that our current cash, cash equivalents, investments, and interest receivable, will be sufficient to fund operations through at least twelve months from the date of issuance of our consolidated financial statements. We have based these estimates on assumptions that may prove to be wrong, and we could utilize our available capital resources sooner than we expect. We cannot guarantee that we will be able to raise additional capital on reasonable terms or at all.

We have an at-the-market equity offering program (the "ATM") through an agreement with Cowen and Company, LLC (“Cowen”), pursuant to which we may offer and sell up to $125.0 million of our common stock from time to time through Cowen, acting as our sales agent. We made no sales under the ATM in the three months ended March 31, 2025. Through March 31, 2025, we have sold approximately 3.3 million shares under the ATM and received net proceeds of $38.4 million, after deducting commissions. As of March 31, 2025, we had $85.6 million in shares of our common stock remaining under the ATM.

Comparison of Cash Flows for the Three Months Ended March 31, 2025 and 2024

The following table summarizes our sources and uses of cash for the three months ended March 31, 2025 and 2024 (in thousands):


	Three Months Ended March 31,
	2025			2024
Net cash used in operating activities	$	(43,155	)	$	(38,247	)
Net cash provided by investing activities		36,805			12,956
Net cash provided by financing activities		—			1,085
Net decrease in cash and cash equivalents	$	(6,350	)	$	(24,206	)

Cash Flow from Operating Activities

For the three months ended March 31, 2025, our operating activities used $43.2 million of cash, which primarily consisted of our operating expenses, excluding non-cash items, of $45.5 million and a $1.8 million net change in our non-tax operating assets and liabilities, partially offset by interest income, excluding accretion on marketable securities, of $4.3 million. The non-cash operating expenses primarily consisted of equity-based compensation expense.

For the three months ended March 31, 2024, our operating activities used $38.2 million of cash, which primarily consisted of our operating expenses, excluding non-cash items, of $34.7 million and a $9.8 million net change in our non-tax operating assets and liabilities, partially offset by an income tax refund of $3.9 million and interest income, excluding accretion on marketable securities, of $2.4 million. The non-cash operating expenses primarily consisted of equity-based compensation expense.

Cash Flow from Investing Activities

For the three months ended March 31, 2025, our investing activities provided $36.8 million, which consisted of $162.6 million of proceeds from the maturities of marketable securities, partially offset by $125.8 million of purchases of marketable securities.

For the three months ended March 31, 2024, our investing activities provided $13.0 million, which primarily consisted of $144.3 million of proceeds from the maturities of marketable securities, partially offset by $131.4 million of purchases of marketable securities.

Cash Flow from Financing Activities

For the three months ended March 31, 2025, no cash was provided by or used in financing activities.

For the three months ended March 31, 2024, net cash provided by financing activities was $1.1 million in net proceeds from the issuance of common stock under equity-based compensation plans.

Future Funding Requirements

We expect our expenses to continue to increase in connection with our ongoing activities, particularly as we:

•

continue our research and development of our current and future product candidates and programs;

•

conduct preclinical studies and clinical trials for our current and future product candidates;

•

experience any delays or encounter any issues with any of the above, including but not limited to failed studies, or trials, complex results, safety issues, or other regulatory challenges;

•

develop the necessary processes, controls, and manufacturing capabilities to obtain marketing approval for our current and future product candidates and to support manufacturing on a commercial scale;

•

develop and implement plans to establish and operate in-house manufacturing operations and facilities, if deemed appropriate;

•

seek regulatory approvals for our current and future product candidates that successfully complete clinical trials;

•

hire and retain additional personnel, such as nonclinical, clinical, pharmacovigilance, quality assurance, regulatory affairs, manufacturing, distribution, legal, compliance, medical affairs, finance, general and administrative, commercial, and scientific personnel; and

•

develop, maintain, expand, and protect our intellectual property portfolio.

Based on our current operational plans and assumptions, we expect that our current cash, cash equivalents, investments, and interest receivable will be sufficient to fund operations through at least twelve months from the date of issuance of our consolidated financial statements. We have based these estimates on assumptions that may prove to be wrong, and we could utilize our available capital resources sooner than we expect. As we progress with our development programs and the regulatory review process, we expect to incur significant expenses related to product manufacturing, pre-commercial activities and commercialization. We may also require additional capital to pursue in-licenses or acquisitions of other programs to further expand our pipeline.

Because of the numerous risks and uncertainties associated with research, development and commercialization of our product candidates and programs, we are unable to estimate the exact amount of our working capital requirements. Our future funding requirements will depend on and could increase significantly as a result of many factors, including:

•

the scope, progress, results, and costs of drug discovery, laboratory testing, and preclinical and clinical development for our current and future product candidates;

•

timely completion of our preclinical studies and clinical trials, which may be significantly slower or cost more than we currently anticipate and will depend substantially upon the performance of third-party contractors;

•

the prevalence, duration, and severity of potential side effects or other safety issues experienced by patients receiving our current and future product candidates;

•

our ability to establish and maintain collaborations and license agreements on favorable terms, if at all, and the extent to which we acquire or in-license technologies or programs, if at all;

•

our ability to enroll clinical trials in a timely manner and to quickly resolve any delays or clinical holds that may be imposed on our development programs;

•

the costs of expanding our facilities to accommodate our expected growth in personnel;

•

our ability and the ability of third parties with whom we contract to manufacture adequate clinical and commercial supplies of our current and future product candidates, remain in good standing with regulatory authorities and develop, validate, and maintain commercially viable manufacturing processes that are compliant with current good manufacturing practices;

•

the costs of preparing, filing, and prosecuting patent applications, maintaining and enforcing our intellectual property rights, and defending intellectual property-related claims;

•

the extent to which we acquire or in-license technologies or programs;

•

the sales price and availability of adequate third-party coverage and reimbursement for our product candidates, if and when approved; and

•

the ongoing costs of operating as a public company.

Until such time, if ever, that we can generate product revenue sufficient to achieve profitability, we expect to finance our cash needs through equity offerings, debt financings, government or other third-party funding, marketing and distribution arrangements, and other collaborations, strategic alliances and licensing arrangements. To the extent that we raise additional capital through the sale of equity, current ownership interests will be diluted. If we raise additional funds through government or third-party funding, collaboration agreements, strategic alliances, licensing arrangements, or marketing and distribution arrangements, 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. Debt financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures, or declaring dividends. If we are unable to raise additional funds when needed, we may be required to delay, limit, reduce, or terminate our product development or future commercialization efforts or grant rights to develop and market products or product candidates that we would otherwise prefer to develop and market ourselves.

Contractual Obligations and Other Commitments

We have certain payment obligations that are contingent upon future events under various license and collaboration agreements. Under these agreements, we will be required to make milestone payments upon successful completion and achievement of certain intellectual property, clinical, regulatory, and sales milestones, and we will be required to make royalty payments in connection with the sale of products developed under these agreements. As the achievement and timing of these future payment obligations are not probable or estimable, such amounts have not been included in our consolidated balance sheets as of March 31, 2025 and December 31, 2024.

As of March 31, 2025, total future minimum lease payments were $2.0 million with $1.5 million payable within twelve months. See Note 10 to our consolidated financial statements included in this Quarterly Report on Form 10-Q for further detail on our lease obligations and the timing of expected future payments.

In addition, we enter into agreements in the normal course of business with CROs for clinical trials and with other vendors for preclinical studies, manufacturing services, and other services and products for operating purposes, which are generally cancelable upon written notice.

Critical Accounting Policies and Estimates

Our critical accounting policies have not materially changed from those described in the 2024 10-K.

Recently Issued and Adopted Accounting Pronouncements

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

Item 3. Quantitative and Qualitative Disclosures About Market Risk.

Interest rate risk

We own financial instruments that are sensitive to market risk as part of our investment portfolio. Our investment portfolio is used to preserve our capital until it is used to fund operations, including our research and development activities. None of these market-risk sensitive instruments are held for trading purposes. We invest primarily in money market mutual funds and marketable securities including U.S. government obligations and corporate bonds that meet high credit quality standards, as specified in our investment policy. The goals of our investment policy are (i) safety and preservation of principal and diversification of risk and (ii) liquidity of investments sufficient to meet cash flow requirements. Our investments are evaluated regularly to determine the fair value of our portfolio. We believe that should a 10.0% change in interest rates have occurred on March 31, 2025, this change would not have had a material effect on the fair value of our investment portfolio as of that date. Any changes would only be realized if we sold the investments prior to maturity.

Foreign currency exchange risk

We are not currently exposed to significant market risk related to changes in foreign currency exchange rates; however, we do contract with vendors that are located outside of the United States and may be subject to fluctuations in foreign currency rates. We may enter into additional contracts with vendors located outside of the United States in the future, which may increase our foreign currency exchange risk.

Inflation

Inflation generally affects us by increasing our cost of labor and preclinical and clinical development costs. We do not believe that inflation had a material effect on our business, financial condition or results of operations during the three months ended March 31, 2025.

Item 4. Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

Based on an evaluation under the supervision and with the participation of our management, our principal executive officer and principal financial officer have concluded that our disclosure controls and procedures as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934 (as amended, the "Exchange Act") were effective as of March 31, 2025 to provide reasonable assurance 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 SEC rules and forms and (ii) accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate, to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) that occurred during the fiscal quarter ended March 31, 2025 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II—OTHER INFORMATION

Item 1. Legal Proceedings.

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

Item 1A. Risk Factors.

In addition to the other information set forth in this Quarterly Report on Form 10-Q, you should carefully consider the factors discussed in Part I, “Item 1A. Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2024 (the “2024 10-K"), which could materially affect our business, financial condition or future results. The risk factors disclosure in our 2024 10-K is qualified by the information that is described in this Quarterly Report on Form 10-Q. The risks described in our 2024 10-K are not our only risks. Additional risks and uncertainties not presently known to us or that we currently believe to be immaterial also may materially adversely affect our business, financial condition or future results. There have been no material changes to our risk factors as previously disclosed in the 2024 10-K.

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

Not applicable.

Item 3. Defaults Upon Senior Securities.

Not applicable.

Item 4. Mine Safety Disclosures.

Not applicable.

Item 5. Other Information.

Rule 10b5-1 Trading Plans

During the fiscal quarter ended March 31, 2025, none of our directors and officers (as defined in Rule 16a-1(f) under the Exchange Act) adopted, modified, or terminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement,” as those terms are defined in Item 408(a) of Regulation S-K.

Item 6. Exhibits.


Exhibit Number		Description

3.1		Second Amended and Restated Certificate of Incorporation of the Registrant, as amended by the Certificate of Amendment, effective as of April 15, 2024 (incorporated by reference to Exhibit 3.1 of the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on May 15, 2024).

3.2		Third Amended and Restated Bylaws of the Registrant, effective as of April 15, 2024 (incorporated by reference to Exhibit 3.2 of the Registrant’s Current Report on Form 8-K filed with the SEC on April 16, 2024).

3.3		Certificate of Designation of Preferences, Rights and Limitations of Series A Convertible Preferred Stock (incorporated by reference to Exhibit 3.1 of the Registrant's Current Report on Form 8-K filed with the SEC on January 19, 2023).

10.1*†		Amendment Three to the Collaboration Agreement, dated July 11, 2024, by and between Adimab, LLC and the Registrant.

10.2*#		Non-Employee Director Compensation Policy.

31.1*		Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

31.2*		Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

32.1**		Certification of Principal Executive Officer and 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 - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.

101.SCH		Inline XBRL Taxonomy Extension Schema Document With Embedded Linkbase Documents.

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

* Filed herewith.

** Furnished herewith

† Portions of this exhibit (indicated by asterisks) have been omitted because the Registrant has determined they are not material and would likely cause competitive harm to the Registrant if publicly disclosed.

# Indicates a management contract or compensatory plan, contract or arrangement.

SIGNATURES

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


	Cullinan Therapeutics, Inc.

Date: May 8, 2025	By:	/s/ Nadim Ahmed
		Name: Nadim Ahmed
		Title: President and Chief Executive Officer (Principal Executive Officer)



Date: May 8, 2025	By:	/s/ Mary Kay Fenton
		Name: Mary Kay Fenton
		Title: Chief Financial Officer (Principal Financial and Accounting Officer)

Exhibit 10.1

EXECUTION VERSION

CONFIDENTIAL

Portions of this Exhibit have been redacted because they are both (i) not material and (ii) would be competitively harmful if publicly disclosed. Information that was omitted has been noted in this document with a placeholder identified by the mark “[***]”.

AMENDMENT THREE TO THE COLLABORATION AGREEMENT

THIS AMENDMENT THREE (this “Amendment”), dated March 17, 2025 (the “Amendment Three Effective Date”), amends the COLLABORATION AGREEMENT (the “Agreement”) by and between Adimab, LLC, a Delaware limited liability company having an address at 7 Lucent Drive, Lebanon, NH 03766 (“Adimab”), and Cullinan Therapeutics, Inc. (formerly, Cullinan Management, Inc.), a Delaware corporation having an address at 1 Main Street, Suite 1350, Cambridge, MA 02142 (“Cullinan”). Capitalized terms used herein and not defined shall have the meanings ascribed to them in the Agreement.

BACKGROUND

WHEREAS, the Parties now wish to amend the terms of the Agreement, as further set forth herein, to collaborate on Research Programs for [***];

NOW, THEREFORE, in consideration of the foregoing premises and the mutual covenants set forth below, and for other good and valuable consideration, the receipt of which is hereby acknowledged, Adimab and Cullinan hereby agree as follows:

The first sentence of Section 2.1(a)(i) (Research Plans for Targets Other Than CD3) of the Agreement is deleted and replaced with the following:

[***].

The last sentence of Section 2.1(a)(i) (Research Plans for Targets Other Than CD3) of the Agreement is deleted and replaced with the following:

[***].

All other terms of the Agreement shall remain unchanged and in full force and effect.

[Signature Page Follows]

IN WITNESS WHEREOF, the Parties have by duly authorized persons executed this Amendment as of the Amendment Three Effective Date.


CULLINAN THERAPEUTICS, INC.:	ADIMAB, LLC:
By: /s/ Kavya Rakhra	By: /s/ Phil Chase
Name: Kavya Rakhra	Name: Phil Chase
Title: Senior Director, Preclinical R&D	Title: Chief Executive Officer
Date: March 17, 2025	Date: March 17, 2025

Exhibit 10.2

CULLINAN THERAPEUTICS, INC.

NON-EMPLOYEE DIRECTOR COMPENSATION POLICY

The purpose of this Non-Employee Director Compensation Policy (the “Policy”) of Cullinan Therapeutics, Inc. (the “Company”) 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 or its subsidiaries (“Outside Directors”). This Policy is effective as of the adoption date set forth below (the “Effective Date”). In furtherance of the purpose stated above, all Outside Directors shall be paid compensation for services provided to the Company as set forth below:

Cash Retainers

Annual Retainer for Board Membership: $40,000 for general availability and participation in meetings and conference calls of our Board of Directors, to be paid quarterly in arrears, pro-rated based on the number of actual days served by the director during such calendar quarter. No additional compensation will be paid for attending individual meetings of the Board of Directors.


Additional Annual Retainer for Non-Executive Chair:	$35,000
Additional Annual Retainers for Committee Membership:
Audit Committee Chair:	$20,000
Audit Committee member:	$10,000
Compensation Committee Chair:	$12,000
Compensation Committee member:	$6,000
Nominating and Corporate Governance Committee Chair:	$10,000
Nominating and Corporate Governance Committee member:	$5,000

Chair and committee member retainers are in addition to retainers for members of the Board of Directors. No additional compensation will be paid for attending individual committee meetings of the Board of Directors.

Equity Retainers

Initial Award: An initial, one-time stock option award (the “Initial Award”) with a Value (as defined below) of $359,000 will be granted to each new Outside Director upon his or her election to the Board of Directors, which shall vest with respect to one-third (1/3) of the shares subject to such Initial Award on the first anniversary of the date of grant, with the remainder vesting thereafter in 24 equal monthly installments, provided, however, that all vesting shall cease if the director resigns from the Board of Directors or otherwise ceases to serve as a director of the Company, unless the Board of Directors determines that the circumstances warrant continuation of vesting. The Initial Award shall expire ten years from the date of grant, and shall have a per share exercise price equal to the Fair Market Value (as defined in the Company’s 2021 Stock Option and Incentive Plan) of the Company’s common stock on the date of grant. This Initial Award applies only to Outside Directors who are first elected to the Board of Directors subsequent to the Effective Date.

Annual Award: On each date of each Annual Meeting of Stockholders of the Company following the Effective Date (the “Annual Meeting”), each continuing Outside Director, other than a director receiving an Initial Award, will receive an annual stock option award (the “Annual Award”) with a Value of $215,000, which shall vest in full upon the earlier of (i) the first anniversary of the date of grant or (ii) the date of the next Annual Meeting; provided, however, that all vesting shall cease if the director resigns from the Board of Directors or otherwise ceases to serve as a director of the Company, unless the Board of Directors determines that the circumstances warrant continuation of vesting. Such Annual Award shall expire ten years from the date of grant, and shall have a per share exercise price equal to the Fair Market Value (as defined in the Company’s 2021 Stock Option and Incentive Plan) of the Company’s common stock on the date of grant.

Value: For purposes of this Policy, “Value” means with respect to any stock option award, 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 Financial Accounting Standard Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 718.

Sale Event Acceleration: All outstanding Initial Awards and Annual Awards held by an Outside Director shall become fully vested and exercisable or nonforfeitable upon a Sale Event (as defined in the Company’s 2021 Stock Option and Incentive Plan).

Expenses

The Company will reimburse all reasonable out-of-pocket expenses incurred by non- employee directors in attending meetings of the Board of Directors or any committee thereof.

Maximum Annual Compensation

The aggregate amount of compensation, including both equity compensation and cash compensation, paid by the Company to any Outside Director in a calendar year for services as an Outside Director period shall not exceed $500,000; provided, however, that such amount shall be $750,000 for the calendar year in which the applicable Outside Director is initially elected or appointed to the Board of Directors; (or such other limits as may be set forth in Section 3(b) of the Company’s 2021 Stock Option and Incentive Plan or any similar provision of a successor plan). For this purpose, the “amount” of equity compensation paid in a calendar year shall be determined based on the grant date fair value thereof, as determined in accordance with FASB ASC Topic 718 or its successor provision, but excluding the impact of estimated forfeitures related to service-based vesting conditions.

Adopted: January 7, 2021; amended June 2023; further amended February 2025

Exhibit 31.1

CERTIFICATION PURSUANT TO

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

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

I, Nadim Ahmed, certify that:

I have reviewed this Quarterly Report on Form 10-Q for the period ended March 31, 2025 of Cullinan Therapeutics, Inc. (the “registrant”);

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;

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;

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)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

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

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

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

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

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 8, 2025	By:	/s/ Nadim Ahmed
		Nadim Ahmed
		President and Chief Executive Officer (Principal Executive Officer)

Exhibit 31.2

CERTIFICATION PURSUANT TO

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

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

I, Mary Kay Fenton, certify that:

I have reviewed this Quarterly Report on Form 10-Q for the period ended March 31, 2025 of Cullinan Therapeutics, Inc. (the “registrant”);

(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 8, 2025	By:	/s/ Mary Kay Fenton
		Mary Kay Fenton
		Chief Financial Officer (Principal Financial and Accounting Officer)

Exhibit 32.1

CERTIFICATION PURSUANT TO

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

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Cullinan Therapeutics, Inc. (the “Company”) on Form 10-Q for the period ending March 31, 2025 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

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

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


Date: May 8, 2025	By:	/s/ Nadim Ahmed
		Nadim Ahmed
		President and Chief Executive Officer (Principal Executive Officer)


Date: May 8, 2025	By:	/s/ Mary Kay Fenton
		Mary Kay Fenton
		Chief Financial Officer (Principal Financial and Accounting Officer)

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2025	Apr. 30, 2025
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2025
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q1
Entity Registrant Name	CULLINAN THERAPEUTICS, INC.
Current Fiscal Year End Date	--12-31
Document Quarterly Report	true
Document Transition Report	false
Entity Central Index Key	0001789972
Securities Act File Number	001-39856
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	81-3879991
Entity Address, Address Line One	One Main Street
Entity Address, Address Line Two	Suite 1350
Entity Address, City or Town	Cambridge
Entity Address, Country	MA
Entity Address, Postal Zip Code	02142
City Area Code	617
Local Phone Number	410-4650
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	CGEM
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		59,014,667

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 76,655	$ 83,005
Short-term investments	227,172	315,972
Prepaid expenses and other current assets	13,945	15,691
Total current assets	317,772	414,668
Property and equipment, net	607	683
Operating lease right-of-use assets	1,550	1,667
Other assets	366	366
Long-term investments	259,386	204,440
Total assets	579,681	621,824
Current liabilities:
Accounts payable	3,401	1,682
Accrued expenses and other current liabilities	22,601	27,663
Operating lease liabilities, current	1,347	1,302
Total current liabilities	27,349	30,647
Long-term liabilities:
Operating lease liabilities, net of current portion	493	849
Total liabilities	27,842	31,496
Commitments and contingencies (Note 9)
Stockholders' equity:
Preferred stock, $0.0001 par value, 10,000,000 shares authorized as of March 31, 2025 and December 31, 2024; 647,500 shares issued and outstanding as of March 31, 2025 and December 31, 2024	0	0
Common stock, $0.0001 par value, 150,000,000 shares authorized as of March 31, 2025 and December 31, 2024; 58,698,919 and 58,510,610 shares issued and outstanding as of March 31, 2025 and December 31, 2024, respectively	6	6
Additional paid-in capital	968,069	958,695
Accumulated other comprehensive income (loss)	505	(133)
Accumulated deficit	(416,741)	(368,240)
Total Cullinan stockholders' equity	551,839	590,328
Noncontrolling interests	0	0
Total stockholders' equity	551,839	590,328
Total liabilities and stockholders' equity	$ 579,681	$ 621,824

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Preferred Stock par value	$ 0.0001	$ 0.0001
Preferred Stock, shares authorized	10,000,000	10,000,000
Preferred Stock, Share issued	647,500	647,500
Preferred stock, Share Outstanding	647,500	647,500
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	150,000,000	150,000,000
Common Stock, Shares Issued	58,698,919	58,510,610
Common stock, shares outstanding	58,698,919	58,510,610

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Operating expenses:
Research and development	$ 41,459	$ 30,646
General and administrative	13,537	12,343
Total operating expenses	54,996	42,989
Loss from operations	(54,996)	(42,989)
Other income (expense):
Interest income	6,580	5,693
Other expense, net	(85)	(44)
Net loss	(48,501)	(37,340)
Net loss attributable to noncontrolling interests	0	(192)
Net loss attributable to Cullinan	(48,501)	(37,148)
Comprehensive income (loss):
Net loss	(48,501)	(37,340)
Unrealized gain (loss) on investments	638	(202)
Comprehensive loss	(47,863)	(37,542)
Comprehensive loss attributable to noncontrolling interests	0	(192)
Comprehensive loss attributable to Cullinan	(47,863)	(37,350)
Common Stock
Other income (expense):
Net loss attributable to Cullinan	$ (43,698)	$ (32,287)
Basic and diluted net loss per share attributable to Cullinan:
Net loss per share, basic	$ (0.74)	$ (0.75)
Net loss per share, diluted	$ (0.74)	$ (0.75)
Weighted-average shares used in computing basic and diluted net loss per share attributable to Cullinan:
Weighted-average common stock outstanding - basic	58,905	43,011
Weighted-average common stock outstanding - diluted	58,905	43,011
Preferred Stock
Other income (expense):
Net loss attributable to Cullinan	$ (4,803)	$ (4,861)
Basic and diluted net loss per share attributable to Cullinan:
Net loss per share, basic	$ (7.42)	$ (7.51)
Net loss per share, diluted	$ (7.42)	$ (7.51)
Weighted-average shares used in computing basic and diluted net loss per share attributable to Cullinan:
Weighted-average common stock outstanding - basic	648	648
Weighted-average common stock outstanding - diluted	648	648

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Noncontrolling Interest
Balances at Dec. 31, 2023	$ 453,895		$ 4	$ 654,685	$ (129)	$ (200,857)	$ 192
Balances, shares at Dec. 31, 2023		647,500	42,900,083
Issuance of common stock under equity-based compensation plans	1,085			1,085
Issuance of common stock under equity-based compensation plans			165,562
Equity-based compensation	8,227			8,227
Unrealized gain (loss) on investments	(202)				(202)
Net Loss	(37,340)					(37,148)	$ (192)
Balances at Mar. 31, 2024	425,665		$ 4	663,997	(331)	(238,005)
Balances, shares at Mar. 31, 2024		647,500	43,065,645
Balances at Dec. 31, 2024	590,328		$ 6	958,695	(133)	(368,240)
Balances, shares at Dec. 31, 2024		647,500	58,510,610
Issuance of common stock under equity-based compensation plans			188,309
Equity-based compensation	9,374			9,374
Unrealized gain (loss) on investments	638				638
Net Loss	(48,501)					(48,501)
Balances at Mar. 31, 2025	$ 551,839		$ 6	$ 968,069	$ 505	$ (416,741)
Balances, shares at Mar. 31, 2025		647,500	58,698,919

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Operating activities:
Net loss	$ (48,501)	$ (37,340)
Adjustments to reconcile net loss to net cash used in operating activities:
Equity-based compensation expense	9,374	8,227
Accretion on marketable securities	(2,311)	(3,306)
Depreciation and amortization	76	76
Changes in operating assets and liabilities:
Prepaid expenses and other assets	1,742	411
Accounts payable	1,720	1,214
Accrued expenses and other liabilities	(5,255)	(7,529)
Net cash used in operating activities	(43,155)	(38,247)
Investing activities:
Maturities of marketable securities	162,645	144,325
Purchase of marketable securities	(125,840)	(131,369)
Net cash provided by investing activities	36,805	12,956
Financing activities:
Issuance of common stock under equity-based compensation plans	0	1,085
Net cash provided by financing activities	0	1,085
Net decrease in cash and cash equivalents	(6,350)	(24,206)
Cash and cash equivalents at beginning of period	83,005	98,434
Cash and cash equivalents at end of period	76,655	74,228
Non-cash financing activities and supplemental cash flow information
Cash paid refunded for income taxes	$ 0	$ (3,870)

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Mar. 31, 2025	Mar. 31, 2024
Pay vs Performance Disclosure
Net Income (Loss)	$ (48,501)	$ (37,148)

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2025
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Rule 10b5-1 Arrangement Modified	false
Non Rule 10b5-1 Arrangement Modified	false

Nature of Business and Basis of Presentation

3 Months Ended

Mar. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Nature of Business and Basis of Presentation

(1)

Nature of Business and Basis of Presentation

Organization

Liquidity

Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2025
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	(2) Summary of Significant Accounting Policies Cullinan’s significant accounting policies have not changed materially from those disclosed in its annual audited consolidated financial statements and accompanying notes in its Annual Report on Form 10-K for the fiscal year ended December 31, 2024 (the “2024 10-K”). Basis of Presentation The accompanying unaudited consolidated financial statements of the Company have been prepared in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) and in accordance with applicable rules and regulations of the Securities and Exchange Commission ("SEC") for interim financial reporting and include the accounts of Cullinan and its consolidated subsidiaries. Intercompany balances and transactions have been eliminated in consolidation. In the opinion of Cullinan’s management, the unaudited consolidated financial statements reflect all adjustments, which are normal and recurring in nature, and necessary for fair financial statement presentation. The preparation of these unaudited consolidated financial statements and accompanying notes in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported. Actual results could differ materially from those estimates. These unaudited consolidated financial statements and accompanying notes should be read in conjunction with the Company’s annual audited consolidated financial statements and accompanying notes included in the 2024 10-K. Recently Adopted Accounting Pronouncements In December 2023, the Financial Accounting Standards Board ("FASB") issued an accounting standards update to enhance transparency about income tax information through improvements to income tax disclosures primarily related to the rate reconciliation and income taxes paid information. The main provisions in this update will require companies to disclose, on an annual basis, specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. This update will also require companies to disclose, on an annual basis, the amount of income taxes paid, income (or loss) from continuing operations before income tax expense (or benefit), and income tax expense (or benefit) from continuing operations, disaggregated by federal, state and foreign jurisdictions. This new standard is effective for fiscal years beginning after December 15, 2024. Cullinan adopted this standard on January 1, 2025. Recently Issued Accounting Pronouncements In November 2024, the FASB issued an accounting standards update to improve disclosures regarding the types of expenses included in commonly presented expense captions, including disaggregating the amounts of employee compensation, depreciation and amortization included within each income statement expense caption. This standard will be effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. Cullinan is evaluating the impact of adopting this new standard on its consolidated financial statements and disclosures.

Financial Instruments

3 Months Ended

Mar. 31, 2025

Financial Instruments Pledged as Collateral [Abstract]

Financial Instruments

(3)

Financial Instruments

Investments

Cullinan recognized its investments by security type at March 31, 2025 as follows (in thousands):


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments
Corporate notes	$	148,703	$	64	$	(49	)	$	148,718
U.S. government notes		78,380		78		(2	)		78,456
Total short-term investments		227,083		142		(51	)		227,174
Long-term investments
U.S. government notes		149,244		577		(16	)		149,805
Corporate notes		70,261		37		(209	)		70,089
Asset-backed securities		39,465		44		(19	)		39,490
Total long-term investments		258,970		658		(244	)		259,384
Total investments	$	486,053	$	800	$	(295	)	$	486,558

Cullinan recognized its investments by security type at December 31, 2024 as follows (in thousands):


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments
Corporate notes	$	211,584	$	343	$	(6	)	$	211,921
U.S. government notes		78,874		81		—			78,955
Asset-backed securities		25,084		12		—			25,096
Total short-term investments		315,542		436		(6	)		315,972
Long-term investments
U.S. government notes		118,423		88		(188	)		118,323
Corporate notes		77,196		9		(472	)		76,733
Asset-backed securities		9,384		—		—			9,384
Total long-term investments		205,003		97		(660	)		204,440
Total investments	$	520,545	$	533	$	(666	)	$	520,412

Fair Value of Financial Instruments

The following table sets forth the fair value of Cullinan’s financial assets that were measured at fair value on a recurring basis as of March 31, 2025 (in thousands):


	Level 1		Level 2		Level 3		Total
Short-term investments
Corporate notes	$	—	$	148,718	$	—	$	148,718
U.S. government notes		—		78,456		—		78,456
Total short-term investments		—		227,174		—		227,174
Long-term investments
U.S. government notes		—		149,805		—		149,805
Corporate notes		—		70,089		—		70,089
Asset-backed securities		—		39,490		—		39,490
Total long-term investments		—		259,384		—		259,384
Total investments	$	—	$	486,558	$	—	$	486,558

The following table sets forth the fair value of the Company’s financial assets that were measured at fair value on a recurring basis as of December 31, 2024 (in thousands):


	Level 1		Level 2		Level 3		Total
Short-term investments
Corporate notes	$	—	$	211,921	$	—	$	211,921
U.S. government notes		—		78,955		—		78,955
Asset-backed securities		—		25,096		—		25,096
Total short-term investments		—		315,972		—		315,972
Long-term investments
U.S. government notes		—		118,323		—		118,323
Corporate notes		—		76,733		—		76,733
Asset-backed securities		—		9,384		—		9,384
Total long-term investments		—		204,440		—		204,440
Total investments	$	—	$	520,412	$	—	$	520,412

Accrued Expenses and Other Current Liabilities

3 Months Ended

Mar. 31, 2025

Accrued Expenses And Other Current Liabilities [Abstract]

Accrued Expenses and Other Current Liabilities

(4)

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following as of March 31, 2025 and December 31, 2024 (in thousands):


	March 31, 2025		December 31, 2024
Contracted research and development expenses	$	12,395	$	10,297
Due to Taiho under collaboration agreement, net		4,715		5,994
Employee compensation		2,696		9,935
Other current liabilities		2,795		1,437
Total accrued expenses and other current liabilities	$	22,601	$	27,663

License and Collaboration Agreements

3 Months Ended

Mar. 31, 2025

License And Collaboration Agreements [Abstract]

License and Collaboration Agreements

(5)

License and Collaboration Agreements

Harbour License Agreement

Taiho Agreements

Cullinan is also eligible to receive up to $130.0 million from Taiho tied to epidermal growth factor receptor exon 20 non-small-cell lung cancer U.S. regulatory milestones.

Other License and Collaboration Agreements

Stockholders' Equity

3 Months Ended

Mar. 31, 2025

Stockholders' Equity Note [Abstract]

Stockholders' Equity

(6)

Stockholders' Equity

Common Stock

2024 Private Placement

At-the-Market Equity Offering Program

Preferred Stock

The Company determined that the preferred stock should be classified as permanent equity.

Noncontrolling Interests


	Ownership Interest as of
Product Candidate	March 31, 2025	December 31, 2024
CLN-619	99%	99%
CLN-049	98%	98%
CLN-617	96%	96%

Warrants

Equity-Based Compensation

3 Months Ended

Mar. 31, 2025

Share-Based Payment Arrangement [Abstract]

Equity-Based Compensation

(7)

Equity-Based Compensation


	Three Months Ended March 31,
	2025		2024
General and administrative	$	5,445	$	5,092
Research and development		3,929		3,135
Total equity-based compensation	$	9,374	$	8,227

Royalty Transfer Agreements

3 Months Ended

Mar. 31, 2025

Royalty Transfer Agreements [Abstract]

Royalty Transfer Agreements

(8)

Royalty Transfer Agreements

Commitments and Contingencies

3 Months Ended

Mar. 31, 2025

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

(9)

Commitments and Contingencies

Indemnification Agreements

Legal Proceedings

Leases

3 Months Ended

Mar. 31, 2025

Leases [Abstract]

Leases

(10)

Leases

The following table summarizes supplemental cash flow information for the three months ended March 31, 2025 and 2024 (in thousands):


	Three Months Ended March 31,
	2025		2024
Cash paid for amounts included in measurement of lease liabilities:
Operating cash flows from operating leases	$	363	$	510

The following table summarizes the Company’s future minimum lease payments as of March 31, 2025 (in thousands):


	March 31, 2025
Remainder of 2025	$	1,098
2026		872
Total future minimum lease payments		1,970
Less: imputed interest		(130	)
Total lease liabilities at present value	$	1,840

The following table summarizes the weighted-average remaining lease term and discount rate as of March 31, 2025 and December 31, 2024:


	March 31, 2025			December 31, 2024
Weighted-average remaining lease term (in years)		1.3			1.6
Weighted-average discount rate		11.0	%		11.0	%

Net Loss per Share Attributable to Common Stockholders of Cullinan

3 Months Ended

Mar. 31, 2025

Earnings Per Share [Abstract]

Net Loss per Share Attributable to Common Stockholders of Cullinan

(11)

Net Loss per Share Attributable to Cullinan


	Three Months Ended March 31, 2025						Three Months Ended March 31, 2024
	Common Stock			Preferred Stock			Common Stock			Preferred Stock
Numerator:
Net loss attributable to Cullinan - basic and diluted	$	(43,698	)	$	(4,803	)	$	(32,287	)	$	(4,861	)
Denominator:
Weighted-average shares outstanding — basic and diluted		58,905			648			43,011			648
Net loss per share attributable to Cullinan:
Basic and diluted	$	(0.74	)	$	(7.42	)	$	(0.75	)	$	(7.51	)


	Three Months Ended March 31,
	2025		2024
Stock options		12,076		10,155
Preferred stock		6,475		6,475
Restricted stock units		986		520
Employee stock purchase plan		10		4
Total		19,547		17,154

Segment Reporting

3 Months Ended

Mar. 31, 2025

Segment Reporting [Abstract]

Segment Reporting

(12)

Segment Reporting

Financial information of the Company’s reportable segment for the three months ended March 31, 2025 and 2024 are as follows (in thousands):


	Three Months Ended March 31,
	2025			2024
Research and development ("R&D") programs:
CLN-978	$	4,673		$	1,503
CLN-619		6,118			4,286
Zipalertinib		10,160			8,288
CLN-049		3,895			1,476
CLN-617		1,793			1,012
CLN-418		—			3,072
Early-stage programs		1,022			1,361
Total R&D program expense		27,661			20,998
Equity-based compensation		9,374			8,227
R&D personnel and operations		9,831			6,488
G&A personnel		3,489			3,952
License agreement obligations		38			25
Other segment expenses(1)		4,603			3,299
Loss from operations		(54,996	)		(42,989	)
Other income (expense):
Interest income		6,580			5,693
Other income (expense), net		(85	)		(44	)
Net loss		(48,501	)		(37,340	)
Net loss attributable to noncontrolling interests		—			(192	)
Net loss attributable to Cullinan	$	(48,501	)	$	(37,148	)

(1)

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2025
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements of the Company have been prepared in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) and in accordance with applicable rules and regulations of the Securities and Exchange Commission ("SEC") for interim financial reporting and include the accounts of Cullinan and its consolidated subsidiaries. Intercompany balances and transactions have been eliminated in consolidation. In the opinion of Cullinan’s management, the unaudited consolidated financial statements reflect all adjustments, which are normal and recurring in nature, and necessary for fair financial statement presentation. The preparation of these unaudited consolidated financial statements and accompanying notes in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported. Actual results could differ materially from those estimates. These unaudited consolidated financial statements and accompanying notes should be read in conjunction with the Company’s annual audited consolidated financial statements and accompanying notes included in the 2024 10-K.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements In December 2023, the Financial Accounting Standards Board ("FASB") issued an accounting standards update to enhance transparency about income tax information through improvements to income tax disclosures primarily related to the rate reconciliation and income taxes paid information. The main provisions in this update will require companies to disclose, on an annual basis, specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. This update will also require companies to disclose, on an annual basis, the amount of income taxes paid, income (or loss) from continuing operations before income tax expense (or benefit), and income tax expense (or benefit) from continuing operations, disaggregated by federal, state and foreign jurisdictions. This new standard is effective for fiscal years beginning after December 15, 2024. Cullinan adopted this standard on January 1, 2025.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In November 2024, the FASB issued an accounting standards update to improve disclosures regarding the types of expenses included in commonly presented expense captions, including disaggregating the amounts of employee compensation, depreciation and amortization included within each income statement expense caption. This standard will be effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. Cullinan is evaluating the impact of adopting this new standard on its consolidated financial statements and disclosures.

Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2025

Financial Instruments Pledged as Collateral [Abstract]

Schedule of Short-term and Long-term Investment Marketable Securities by Security Type

Investments

Cullinan recognized its investments by security type at March 31, 2025 as follows (in thousands):


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments
Corporate notes	$	148,703	$	64	$	(49	)	$	148,718
U.S. government notes		78,380		78		(2	)		78,456
Total short-term investments		227,083		142		(51	)		227,174
Long-term investments
U.S. government notes		149,244		577		(16	)		149,805
Corporate notes		70,261		37		(209	)		70,089
Asset-backed securities		39,465		44		(19	)		39,490
Total long-term investments		258,970		658		(244	)		259,384
Total investments	$	486,053	$	800	$	(295	)	$	486,558

Cullinan recognized its investments by security type at December 31, 2024 as follows (in thousands):


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments
Corporate notes	$	211,584	$	343	$	(6	)	$	211,921
U.S. government notes		78,874		81		—			78,955
Asset-backed securities		25,084		12		—			25,096
Total short-term investments		315,542		436		(6	)		315,972
Long-term investments
U.S. government notes		118,423		88		(188	)		118,323
Corporate notes		77,196		9		(472	)		76,733
Asset-backed securities		9,384		—		—			9,384
Total long-term investments		205,003		97		(660	)		204,440
Total investments	$	520,545	$	533	$	(666	)	$	520,412

Summary of Fair Value of Financial Assets Measured on Recurring Basis

The following table sets forth the fair value of Cullinan’s financial assets that were measured at fair value on a recurring basis as of March 31, 2025 (in thousands):


	Level 1		Level 2		Level 3		Total
Short-term investments
Corporate notes	$	—	$	148,718	$	—	$	148,718
U.S. government notes		—		78,456		—		78,456
Total short-term investments		—		227,174		—		227,174
Long-term investments
U.S. government notes		—		149,805		—		149,805
Corporate notes		—		70,089		—		70,089
Asset-backed securities		—		39,490		—		39,490
Total long-term investments		—		259,384		—		259,384
Total investments	$	—	$	486,558	$	—	$	486,558

The following table sets forth the fair value of the Company’s financial assets that were measured at fair value on a recurring basis as of December 31, 2024 (in thousands):


	Level 1		Level 2		Level 3		Total
Short-term investments
Corporate notes	$	—	$	211,921	$	—	$	211,921
U.S. government notes		—		78,955		—		78,955
Asset-backed securities		—		25,096		—		25,096
Total short-term investments		—		315,972		—		315,972
Long-term investments
U.S. government notes		—		118,323		—		118,323
Corporate notes		—		76,733		—		76,733
Asset-backed securities		—		9,384		—		9,384
Total long-term investments		—		204,440		—		204,440
Total investments	$	—	$	520,412	$	—	$	520,412

Accrued Expenses and Other Current Liabilities (Tables)

3 Months Ended

Mar. 31, 2025

Accrued Expenses And Other Current Liabilities [Abstract]

Summary of Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following as of March 31, 2025 and December 31, 2024 (in thousands):


	March 31, 2025		December 31, 2024
Contracted research and development expenses	$	12,395	$	10,297
Due to Taiho under collaboration agreement, net		4,715		5,994
Employee compensation		2,696		9,935
Other current liabilities		2,795		1,437
Total accrued expenses and other current liabilities	$	22,601	$	27,663

Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2025

Common Stock And Noncontrolling Interest In Subsidiaries [Abstract]

Schedule of Development Subsidiaries and Their Product Candidates

The following table shows the Company’s ownership interest as of March 31, 2025 and December 31, 2024, respectively, in product candidates in which the Company has a controlling interest:


	Ownership Interest as of
Product Candidate	March 31, 2025	December 31, 2024
CLN-619	99%	99%
CLN-049	98%	98%
CLN-617	96%	96%

Equity-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2025

Share-Based Payment Arrangement [Abstract]

Schedule of Equity-based Compensation Expense Categories In Consolidated Statements of Operations and Comprehensive Income (Loss)


	Three Months Ended March 31,
	2025		2024
General and administrative	$	5,445	$	5,092
Research and development		3,929		3,135
Total equity-based compensation	$	9,374	$	8,227

Leases (Tables)

3 Months Ended

Mar. 31, 2025

Leases [Abstract]

Supplemental Cash Flow Information Relating to Leases

The following table summarizes supplemental cash flow information for the three months ended March 31, 2025 and 2024 (in thousands):


	Three Months Ended March 31,
	2025		2024
Cash paid for amounts included in measurement of lease liabilities:
Operating cash flows from operating leases	$	363	$	510

Summarizes of Future Minimum Lease Payments

The following table summarizes the Company’s future minimum lease payments as of March 31, 2025 (in thousands):


	March 31, 2025
Remainder of 2025	$	1,098
2026		872
Total future minimum lease payments		1,970
Less: imputed interest		(130	)
Total lease liabilities at present value	$	1,840

Summarizes Lease Term and Discount Rate

The following table summarizes the weighted-average remaining lease term and discount rate as of March 31, 2025 and December 31, 2024:


	March 31, 2025			December 31, 2024
Weighted-average remaining lease term (in years)		1.3			1.6
Weighted-average discount rate		11.0	%		11.0	%

Net Loss per Share Attributable to Common Stockholders of Cullinan (Tables)

3 Months Ended

Mar. 31, 2025

Earnings Per Share [Abstract]

Summary of Calculation of Basic and Diluted Net Loss Per Share


	Three Months Ended March 31, 2025						Three Months Ended March 31, 2024
	Common Stock			Preferred Stock			Common Stock			Preferred Stock
Numerator:
Net loss attributable to Cullinan - basic and diluted	$	(43,698	)	$	(4,803	)	$	(32,287	)	$	(4,861	)
Denominator:
Weighted-average shares outstanding — basic and diluted		58,905			648			43,011			648
Net loss per share attributable to Cullinan:
Basic and diluted	$	(0.74	)	$	(7.42	)	$	(0.75	)	$	(7.51	)

Summary of Outstanding Equity Instruments Excluded from Computation of Diluted Net Income (Loss) Per Share

for the three months ended March 31, 2025 and 2024 because their effect would have been anti-dilutive (in thousands):


	Three Months Ended March 31,
	2025		2024
Stock options		12,076		10,155
Preferred stock		6,475		6,475
Restricted stock units		986		520
Employee stock purchase plan		10		4
Total		19,547		17,154

Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2025

Segment Reporting [Abstract]

Financial Information of Reportable Segment

Financial information of the Company’s reportable segment for the three months ended March 31, 2025 and 2024 are as follows (in thousands):


	Three Months Ended March 31,
	2025			2024
Research and development ("R&D") programs:
CLN-978	$	4,673		$	1,503
CLN-619		6,118			4,286
Zipalertinib		10,160			8,288
CLN-049		3,895			1,476
CLN-617		1,793			1,012
CLN-418		—			3,072
Early-stage programs		1,022			1,361
Total R&D program expense		27,661			20,998
Equity-based compensation		9,374			8,227
R&D personnel and operations		9,831			6,488
G&A personnel		3,489			3,952
License agreement obligations		38			25
Other segment expenses(1)		4,603			3,299
Loss from operations		(54,996	)		(42,989	)
Other income (expense):
Interest income		6,580			5,693
Other income (expense), net		(85	)		(44	)
Net loss		(48,501	)		(37,340	)
Net loss attributable to noncontrolling interests		—			(192	)
Net loss attributable to Cullinan	$	(48,501	)	$	(37,148	)

(1)

Nature of Business and Basis of Presentation - Additional Information (Details) - USD ($) $ in Thousands	4 Months Ended
	Apr. 30, 2024	Mar. 31, 2025	Dec. 31, 2024
Nature Of Business And Basis Of Presentation [Line Items]
Cash, cash equivalents, and short-term investments		$ 303,800
Long-term investments and interest receivable		263,600
Short-term investments		$ 227,172	$ 315,972
2024 Private Placement
Nature Of Business And Basis Of Presentation [Line Items]
Net Cash Proceeds from 2024 Private Placement	$ 262,700
Offering costs	$ 17,300

Reorganization and Reverse Stock Split - Summary of LLC Units Previously Reported as Redeemable Preferred Units or Temporary Equity Converted Reclassified to Equity (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Stockholders' Equity (Members' Deficit)
Common Stock	$ 6	$ 6
Additional paid-in capital	968,069	958,695
Accumulated other comprehensive income (loss)	505	(133)
Accumulated deficit	(416,741)	(368,240)
Total Cullinan Stockholders' Equity (Members' Deficit)	551,839	590,328
Non-controlling interests in subsidiaries	0	0
Total Stockholders' Equity (Members' Deficit)	$ 551,839	$ 590,328	$ 425,665	$ 453,895

Financial Instruments - Schedule of Short-term and Long-term Investment Marketable Securities by Security Type (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Available For Sale Securities Fair Value To Amortized Cost Basis [Line Items]
Amortized Cost	$ 486,053	$ 520,545
Gross Unrealized Gains	800	533
Gross Unrealized Losses	(295)	(666)
Estimated Fair Value	486,558	520,412
Long Term Investment
Available For Sale Securities Fair Value To Amortized Cost Basis [Line Items]
Amortized Cost	258,970	205,003
Gross Unrealized Gains	658	97
Gross Unrealized Losses	(244)	(660)
Estimated Fair Value	259,384	204,440
Long Term Investment \| U.S. Government Notes
Available For Sale Securities Fair Value To Amortized Cost Basis [Line Items]
Amortized Cost	149,244	118,423
Gross Unrealized Gains	577	88
Gross Unrealized Losses	(16)	(188)
Estimated Fair Value	149,805	118,323
Long Term Investment \| Asset-backed Securities
Available For Sale Securities Fair Value To Amortized Cost Basis [Line Items]
Amortized Cost	39,465	9,384
Gross Unrealized Gains	44	0
Gross Unrealized Losses	(19)	0
Estimated Fair Value	39,490	9,384
Long Term Investment \| Corporate Note Securities
Available For Sale Securities Fair Value To Amortized Cost Basis [Line Items]
Amortized Cost	70,261	77,196
Gross Unrealized Gains	37	9
Gross Unrealized Losses	(209)	(472)
Estimated Fair Value	70,089	76,733
Short Term Investments
Available For Sale Securities Fair Value To Amortized Cost Basis [Line Items]
Amortized Cost	227,083	315,542
Gross Unrealized Gains	142	436
Gross Unrealized Losses	(51)	(6)
Estimated Fair Value	227,174	315,972
Short Term Investments \| U.S. Government Notes
Available For Sale Securities Fair Value To Amortized Cost Basis [Line Items]
Amortized Cost	78,380	78,874
Gross Unrealized Gains	78	81
Gross Unrealized Losses	(2)	0
Estimated Fair Value	78,456	78,955
Short Term Investments \| Asset-backed Securities
Available For Sale Securities Fair Value To Amortized Cost Basis [Line Items]
Amortized Cost		25,084
Gross Unrealized Gains		12
Gross Unrealized Losses		0
Estimated Fair Value		25,096
Short Term Investments \| Corporate Note Securities
Available For Sale Securities Fair Value To Amortized Cost Basis [Line Items]
Amortized Cost	148,703	211,584
Gross Unrealized Gains	64	343
Gross Unrealized Losses	(49)	(6)
Estimated Fair Value	$ 148,718	$ 211,921

Financial Instruments - Summary of Fair Value of Financial Assets Measured on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total short-term investments	$ 227,174	$ 315,972
Total long-term investments	259,384	204,440
Assets Fair Value Disclosure, Total	486,558	520,412
Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total short-term investments	0	0
Total long-term investments	0	0
Assets Fair Value Disclosure, Total	0	0
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total short-term investments	227,174	315,972
Total long-term investments	259,384	204,440
Assets Fair Value Disclosure, Total	486,558	520,412
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total short-term investments	0	0
Total long-term investments	0	0
Assets Fair Value Disclosure, Total	0	0
U.S. Government Notes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total short-term investments	78,456	78,955
Total long-term investments	149,805	118,323
U.S. Government Notes \| Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total short-term investments	0	0
Total long-term investments	0	0
U.S. Government Notes \| Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total short-term investments	78,456	78,955
Total long-term investments	149,805	118,323
U.S. Government Notes \| Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total short-term investments	0	0
Total long-term investments	0	0
Asset-backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total short-term investments		25,096
Total long-term investments	39,490	9,384
Asset-backed Securities \| Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total short-term investments		0
Total long-term investments	0	0
Asset-backed Securities \| Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total short-term investments		25,096
Total long-term investments	39,490	9,384
Asset-backed Securities \| Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total short-term investments		0
Total long-term investments	0	0
Corporate Note Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total short-term investments	148,718	211,921
Total long-term investments	70,089	76,733
Corporate Note Securities \| Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total short-term investments	0	0
Total long-term investments	0	0
Corporate Note Securities \| Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total short-term investments	148,718	211,921
Total long-term investments	70,089	76,733
Corporate Note Securities \| Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total short-term investments	0	0
Total long-term investments	$ 0	$ 0

Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Accounts Payable and Accrued Liabilities, Current [Abstract]
Contracted research and development expenses	$ 12,395	$ 10,297
Due to Taiho under collaboration agreement, net	4,715	5,994
Employee compensation	2,696	9,935
Other current liabilities	2,795	1,437
Total accrued expenses and other current liabilities	$ 22,601	$ 27,663

License and Collaboration Agreements - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
License And Collaboration Agreements [Line Items]
Research and development costs	$ 41,459	$ 30,646
General and administrative expense	$ 13,537	12,343
Pearl - Taiho
License And Collaboration Agreements [Line Items]
Percentage of profits from potential sales	50.00%
Research and development expense related to share of costs	$ 5,600	6,000
Accrued expenses and other current liabilities	4,700		$ 6,000
RecievablesFromRelatedParty	130,000
Research and development costs	1,400	$ 1,900
General and administrative expense	$ 500

Stockholders' Equity - Additional Information (Details) - USD ($)	3 Months Ended		4 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Apr. 30, 2024	Dec. 31, 2024	May 31, 2023
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Dividends declared	$ 0
Common stock, voting rights	Each share of common stock entitles the holder to one vote and to receive dividends when and if declared by the board of directors of the Company.
Preferred Stock, Par or Stated Value Per Share	$ 0.0001			$ 0.0001
Number of shares of common stock, percentage	9.99%
Increase in number of shares of preferred stock, percentage	19.99%
Shares issued	647,500			647,500
Shares sold/issued	58,698,919			58,510,610
Losses attributed to noncontrolling interests	$ 0	$ (192,000)
In May 2023
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Offer and sell companys common stock					$ 125,000,000
2024 Private Placement
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Net Cash Proceeds from 2024 Private Placement			$ 262,700,000
Offering costs			$ 17,300,000
Shares sold/issued			14,400,000
Warrants Issued to Purchase Additional Common Shares			300,000
Warrant
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Additional shares issued	300,000
Exercise price	$ 0.001
At-the-Market Equity Offering Program \| In May 2023
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Net proceeds	$ 38,400,000
Shares sold/issued	3,300,000
Treasury Stock, Common, Shares	85,600,000

Stockholders' Equity - Schedule of Development Subsidiaries and Their Product Candidates (Details) - Subsidiaries [Member]	Mar. 31, 2025	Dec. 31, 2024
Cullinan M I C A Corp [Member]
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Subsidiary, Ownership Percentage	99.00%	99.00%
Cullinan Florentine Corp [Member]
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Subsidiary, Ownership Percentage	98.00%	98.00%
Cullinan Amber Corp [Member]
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Subsidiary, Ownership Percentage	96.00%	96.00%

Equity-Based Compensation - Schedule of Equity-based Compensation Expense Categories In Consolidated Statements of Operations and Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total equity-based compensation	$ 9,374	$ 8,227
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total equity-based compensation	5,445	5,092
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total equity-based compensation	$ 3,929	$ 3,135

Royalty Transfer Agreements - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($)
Related Party Transaction [Line Items]
Royalties under obligation	$ 0

Commitment and Contingencies (Additional Information) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Indemnification Agreement [Member]
Loss Contingencies [Line Items]
Accrued Liabilities	$ 0	$ 0

Leases - Additional Information (Details) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
Leases - Additional Information (Details) $ in Millions	Aug. 31, 2022 ft²	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Sep. 30, 2024 ft²
Lessee Lease Description [Line Items]
Operating Lease expense \| $		$ 0.3	$ 0.3
Operating lease commence date				Feb. 01, 2018
Operating lease expiration date				Jun. 30, 2024
Massachusetts
Lessee Lease Description [Line Items]
Operating lease rentable area \| ft²	14,000			8,000

Leases - Supplemental Cash Flow Information Relating to Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Leases [Abstract]
Operating cash flows from operating leases	$ 363	$ 510

Leases - Summary of Future Minimum Payments Due Under Operating Lease (Details) $ in Thousands	Mar. 31, 2025 USD ($)
Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
Remainder of 2024	$ 1,098
2026	872
Total future minimum lease payments	1,970
Less: imputed interest	(130)
Total lease liabilities at present value	$ 1,840

Leases - Summary of Weighted Average Remaining Lease Terms and Discount Rates (Details)	Mar. 31, 2025	Dec. 31, 2024
Leases [Abstract]
Weighted-average remaining lease term (in years)	1 year 3 months 18 days	1 year 7 months 6 days
Weighted-average discount rate	11.00%	11.00%

Net Loss per Share Attributable to Common Stockholders of Cullinan - Summary of Calculation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Numerator:
Net loss attributable to common stockholders of Cullinan	$ (48,501)	$ (37,148)
Common Stock
Numerator:
Net loss attributable to common stockholders of Cullinan	$ (43,698)	$ (32,287)
Denominator
Weighted-average common stock outstanding - basic	58,905	43,011
Weighted-average common stock outstanding - diluted	58,905	43,011
Net loss per share attributable to common stockholders of Cullinan:
Basic	$ (0.74)	$ (0.75)
Diluted	$ (0.74)	$ (0.75)
Preferred Stock
Numerator:
Net loss attributable to common stockholders of Cullinan	$ (4,803)	$ (4,861)
Denominator
Weighted-average common stock outstanding - basic	648	648
Weighted-average common stock outstanding - diluted	648	648
Net loss per share attributable to common stockholders of Cullinan:
Basic	$ (7.42)	$ (7.51)
Diluted	$ (7.42)	$ (7.51)

Net Loss per Share Attributable to Common Stockholders of Cullinan - Summary of Outstanding Equity Instruments Excluded from Computation of Diluted Net Loss Per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Shares excluded from computation of diluted net loss per share (in shares)	19,547	17,154
Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Shares excluded from computation of diluted net loss per share (in shares)	12,076	10,155
Preferred Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Shares excluded from computation of diluted net loss per share (in shares)	6,475	6,475
Restricted Stock Awards and RSUs
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Shares excluded from computation of diluted net loss per share (in shares)	986	520
Employee Stock Purchase Plan
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Shares excluded from computation of diluted net loss per share (in shares)	10	4