Company: RNAC
Filing Date: 2025-01-08
Form Type: 424B7
Source: 0001140361-25-000634
Chunk: 0

Company: Cartesian Therapeutics, Inc.
Filing Date: 2025-01-08
Form: 424B7
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#### TABLE OF CONTENTS

#### Filed Pursuant to Rule 424(b)(7)

#### Registration No. 333-283809

### PROSPECTUS

#### 11,392,350 Shares

#### Cartesian Therapeutics, Inc.

#### Common Stock

#### Offered by the Selling Stockholders
**This prospectus relates to the proposed resale or other disposition by the selling stockholders identified herein, or the Selling Stockholders, of up to (i) 110,123 shares, or the Merger Common Shares, of our common stock, par value $0.0001 per share, or the Common Stock, (ii) 6,304,558 shares of Common Stock, or the Merger Conversion Shares, issued or issuable upon the conversion of 189,136.767 shares, or the Merger Preferred Shares, of our Series A Non-Voting Convertible Preferred Stock, par value $0.0001 per share, or the Series A Preferred Stock, and (iii) 4,977,669 shares of Common Stock, or the Private Placement Conversion Shares, which were issued or are issuable upon the conversion of 149,330.115 shares, or the Private Placement Preferred Shares, of Series A Preferred Stock. Subject to certain beneficial ownership limitations, the Series A Preferred Stock are convertible into shares of Common Stock at a ratio of 33.333 shares of Common Stock per share of Series A Preferred Stock. The shares of Common Stock registered pursuant to the registration statement of which this prospectus forms a part are referred to herein as the “Resale Shares.”

The Merger Common Shares and the Merger Preferred Shares were issued to former stockholders of Old Cartesian in connection with the Merger (each as defined below). See the disclosure under the heading “ The Company ” elsewhere in this prospectus for more information regarding the Merger. The Private Placement Preferred Shares were issued and sold to accredited investors in a private placement, or the 2023 Private Placement, pursuant to a Securities Purchase Agreement, dated November 13, 2023, or the Securities Purchase Agreement, between the Company and such investors. We refer to the Merger and the 2023 Private Placement collectively as the Transactions. We are not selling any Resale Shares under this prospectus and will not receive any of the proceeds from the sale or other disposition of Resale Shares by the Selling Stockholders.

The Selling Stockholders may sell the Resale Shares on any national securities exchange or quotation service on which the securities may be listed