X0508 4 2024-10-11 0001453687 Cartesian Therapeutics, Inc. RNAC 0002000987 Hoge Elizabeth C/O CARTESIAN THERAPEUTICS, INC. 704 QUINCE ORCHARD ROAD GAITHERSBURG MD 20878 0 0 1 0 0002000959 Seven One Eight Three Four Irrevocable Trust C/O CARTESIAN THERAPEUTICS, INC. 704 QUINCE ORCHARD ROAD GAITHERSBURG MD 20878 0 0 1 0 0 Common Stock 2024-10-11 4 M 0 1518373 A 4555260 I as trustee Common Stock 506377 I by spouse Series A Non-Voting Convertible Preferred Stock 2024-10-11 4 M 0 45551.19 D Common Stock 1518373 56402.254 I as trustee On October 11, 2024, Seven One Eight Three Four Irrevocable Trust (the "Trust") elected to convert a portion of its shares of the issuer's Series A Non-Voting Convertible Preferred Stock into shares of the issuer's common stock. The remaining shares of the issuer's Series A Non-Voting Convertible Preferred Stock held by the Trust are subject to a beneficial ownership limitation. Shares are held by the Trust. The reporting person is a trustee of the Trust. On November 13, 2023, the issuer acquired the private Delaware corporation which was then known as Cartesian Therapeutics, Inc. in accordance with the terms of an Agreement and Plan of Merger, dated November 13, 2023 (the "Merger"). These securities represent merger consideration payable as a result of the closing of the Merger and securities purchased in a private placement in November 2023. /s/ Murat Kalayoglu, Authorized Person 2024-10-15 /s/ Murat Kalayoglu, Authorized Person 2024-10-15