X0508 4 2025-06-12 0001789972 Cullinan Therapeutics, Inc. CGEM 0001555337 Meek David D. C/O CULLINAN THERAPEUTICS, INC. ONE MAIN STREET, SUITE 1350 CAMBRIDGE MA 02142 true false false false false Stock Option (Right to Buy) 8.95 2025-06-12 4 A false 38513 0 A 2035-06-12 Common Stock 38513 38513 D The option represents a right to purchase a total of 38,513 shares of the Issuer's Common Stock, which shall vest in full on the earlier of (i) June 12, 2026 or (ii) the date of the Issuer's next annual meeting, subject to the Reporting Person's continued service as a director on such vesting date /s/ Jacquelyn Sumer, Attorney-in-Fact 2025-06-16