JACQUELYN L. SUMER - 18 Feb 2026 Form 4 Insider Report for Cullinan Therapeutics, Inc. (CGEM)

Role: Chief Legal Officer
Signature: /s/ Jacquelyn Sumer
Issuer symbol: CGEM
Transactions as of: 18 Feb 2026
Net transactions value: $0
Form type: 4
Filing time: 19 Feb 2026, 17:00:11 UTC
Previous filing: 19 Dec 2025
Next filing: 23 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
SUMER JACQUELYN L	Chief Legal Officer	C/O CULLINAN THERAPEUTICS, INC., ONE MAIN STREET, SUITE 1350, CAMBRIDGE	/s/ Jacquelyn Sumer	19 Feb 2026	0001844824

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	CGEM	Stock Option (Right to Buy)	Award	$0	+230,000		$0.000000	230,000	18 Feb 2026	Common Stock	230,000	$12.44	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The shares underlying the option vest over four years, with one forty-eighth (1/48th) of the shares vesting in equal monthly installments until the fourth anniversary of the grant date.