Cullinan Therapeutics (CGEM) CMO sells 4,982 shares for RSU tax obligations

Rhea-AI Filing Summary

Cullinan Therapeutics Chief Medical Officer trades shares to cover taxes. Jeffrey Alan Jones reported an open-market sale of 4,982 shares of common stock at $13.62 per share on February 20, 2026, to cover personal income tax obligations upon vesting of restricted stock units, and now holds 164,550 shares directly.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Jones Jeffrey Alan

(Last) (First) (Middle)

C/O CULLINAN THERAPEUTICS, INC.

ONE MAIN STREET, SUITE 1350

(Street)

CAMBRIDGE MA 02142

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Cullinan Therapeutics, Inc. [ CGEM ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Medical Officer

3. Date of Earliest Transaction (Month/Day/Year)
02/20/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	02/20/2026		S(1)		4,982	D	$13.62	164,550	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Sale of shares to cover personal income tax obligations upon vesting of restricted stock units.

	/s/ Jacquelyn Sumer, Attorney-in-Fact	02/23/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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FAQ

What insider transaction did Cullinan Therapeutics (CGEM) report for Jeffrey Alan Jones?

Cullinan Therapeutics reported that Chief Medical Officer Jeffrey Alan Jones sold 4,982 shares of common stock. The transaction occurred on February 20, 2026, as an open-market sale linked to tax obligations on vesting restricted stock units.

What was the sale price in the latest CGEM insider transaction?

Jeffrey Alan Jones sold Cullinan Therapeutics common stock at $13.62 per share. This price applied to 4,982 shares in an open-market transaction executed on February 20, 2026, connected to personal income tax obligations from restricted stock unit vesting.

How many Cullinan Therapeutics (CGEM) shares does Jeffrey Alan Jones hold after the sale?

After the reported transaction, Jeffrey Alan Jones directly holds 164,550 shares of Cullinan Therapeutics common stock. This figure reflects his ownership following the 4,982-share open-market sale on February 20, 2026, related to tax obligations on restricted stock unit vesting.

Why did Jeffrey Alan Jones sell Cullinan Therapeutics (CGEM) shares?

The filing states the shares were sold to cover personal income tax obligations upon vesting of restricted stock units. This indicates the sale was tied to compensation-related tax requirements, rather than a discretionary portfolio trade unrelated to equity award vesting.

What transaction code was used in the latest CGEM Form 4 filing?

The transaction used code “S,” indicating a sale in an open market or private transaction. The Form 4 further describes it as an open-market sale of 4,982 Cullinan Therapeutics common shares tied to tax obligations from restricted stock unit vesting.

Is the Jeffrey Alan Jones CGEM transaction categorized as a buy or sell?

The transaction is categorized as a sell. The Form 4 labels it as an open-market sale of 4,982 common shares, with transaction code “S” and a footnote describing it as a sale to cover income taxes on restricted stock unit vesting.