Company: RNAC
Filing Date: 2025-01-10
Form Type: POS AM
Source: 0001140361-25-000680
Chunk: 0

Company: Cartesian Therapeutics, Inc.
Filing Date: 2025-01-10
Form: POS AM
Chunk 0
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As filed with the Securities and Exchange Commission on January 10, 2025 Registration No. 333-275171 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Post-Effective Amendment No. 1 to FORM S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 CARTESIAN THERAPEUTICS, INC. (Exact name of registrant as specified in its charter)

| Delaware                        |                         2834 | 26-1622110            |
| (State or other jurisdiction of 
 incorporation or organization)  | -Primary Standard Industrial 
   Classification Code Number | -I.R.S. Employer      
 Identification Number |

7495 New Horizon Way Frederick, Maryland 21703 (301) 348-8698 (Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices) Carsten Brunn, Ph.D. President and Chief Executive Officer Cartesian Therapeutics, Inc. 7495 New Horizon Way Frederick, Maryland 21703 (301) 348-8698 (Name, address, including zip code, and telephone number, including area code, of agent for service) With copies to: Brian K. Rosenzweig Sarah C. Griffiths Covington & Burling LLP One International Place, Suite 1020 Boston, Massachusetts 02110 (617) 603-8805 Approximate date of commencement of proposed sale to the public: From time to time after this registration statement becomes effective. If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box: ☐ If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box. ☒ If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐ If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐ If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment