X0609 4 2026-06-16 0001789972 Cullinan Therapeutics, Inc. CGEM 0001555337 Meek David D. false C/O CULLINAN THERAPEUTICS, INC. ONE MAIN STREET, SUITE 1350 CAMBRIDGE MA 02142 true false false false false Stock Option (Right to Buy) 13.55 2026-06-16 4 A false 25319 0 A 2026-06-16 Common Stock 25319 25319 D The option represents a right to purchase a total of 25,319 shares of the Issuer's Common Stock, which shall vest in full on the earlier of (i) June 16, 2027 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 2026-06-18