X0508 4 2025-11-28 0 0001453687 Cartesian Therapeutics, Inc. RNAC 0002019791 English Emily C/O CARTESIAN THERAPEUTICS, INC. 7495 NEW HORIZON WAY FREDERICK MD 21703 0 1 0 0 Chief Operations Officer 0 Common Stock 2025-11-28 4 M 0 7500 3.30 A 62726 D Stock Option (Right to Buy) 3.30 2025-11-28 4 M 0 7500 D 2031-04-25 Common Stock 7500 26869 D These options are currently fully vested and exercisable. On November 13, 2023, the issuer acquired the Delaware corporation which was then-known as Cartesian Therapeutics, Inc. ("Old Cartesian") in accordance with the terms of an Agreement and Plan of Merger, dated November 13, 2023. Options to purchase Old Cartesian common stock held by the reporting person were converted into options to purchase shares of the issuer's common stock in connection with the merger. /s/ Matthew Bartholomae, Attorney-in-Fact for Emily English 2025-12-02