TABLE OF CONTENTS As filed with the Securities and Exchange Commission on September 20, 2024 Registration No. 333-281204 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 Amendment No. 2 to FORM S-1 REGISTRATION STATEMENT UNDER Carsten Brunn, Ph.D. President and Chief Executive Officer Cartesian Therapeutics, Inc. 704 Quince Orchard Road Gaithersburg, MD 20878 (617) 923-1400 (Name, address, including zip code, and telephone number, including area code, of agent for service) Copies to: ...

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on September 9, 2024 Registration No. 333-281204 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 Amendment No. 1 to FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Cartesian Therapeutics, Inc. (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) (Primary Standard Industrial Classification Code Number) Delaware 2834 26-1622110 (I.R.S. ...

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on August 2, 2024 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Cartesian Therapeutics, Inc. (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) (Primary Standard Industrial Delaware 2834 26-1622110 (I.R.S. Employer Identification No.) 704 Quince Orchard Road Ga ...