X0508 4 2024-04-08 0001453687 Cartesian Therapeutics, Inc. RNAC 0002000987 Hoge Elizabeth C/O CARTESIAN THERAPEUTICS, INC. 704 QUINCE ORCHARD RD GAITHERSBURG MD 20878 0 0 1 0 0002000959 Seven One Eight Three Four Irrevocable Trust C/O CARTESIAN THERAPEUTICS, INC. 704 QUINCE ORCHARD RD GAITHERSBURG MD 20878 0 0 1 0 0 Common Stock 2024-04-08 4 C 0 2926764 A 3036887 I as trustee Common Stock 2024-04-08 4 C 0 491853 A 506377 I by spouse Series A Non-Voting Convertible Preferred Stock 2024-04-08 4 C 0 87802.950 0 D Common Stock 2926764 101953.444 I by trust Series A Non-Voting Convertible Preferred Stock 2024-04-08 4 C 0 14755.609 0 D Common Stock 491853 0 I by spouse Following the approval by the stockholders of the issuer of the conversion of the Series A Non-Voting Convertible Preferred Stock of the issuer ("Series A Preferred Stock") into shares of common stock of the issuer ("Common Stock"), each share of Series A Preferred Stock automatically converted into 33-1/3 shares of Common Stock, subject to certain limitations, including that a holder of Series A Preferred Stock is prohibited from converting shares of Series Preferred Stock into shares of Common Stock if, as a result of such conversion, such holder, together with its affiliates, would beneficially own more than 19.9% of the total number of shares of Common Stock issued and outstanding immediately after giving effect to such conversion. Shares are owned directly by Seven One Eight Three Four Irrevocable Trust (the "Trust"). The reporting person is a trustee and beneficiary of the Trust. Exhibits 24.1 and 24.2 filed herewith. /s/ Murat Kalayoglu, Authorized Person 2024-04-10 /s/ Murat Kalayoglu, Authorized Person 2024-04-10