Company: RNAC
Filing Date: 2025-01-08
Form Type: 424B7
Source: 0001140361-25-000631
Chunk: 0

Company: Cartesian Therapeutics, Inc.
Filing Date: 2025-01-08
Form: 424B7
Chunk 0
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#### TABLE OF CONTENTS

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

#### Registration No. 333-283806

### PROSPECTUS

#### 6,251,150 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) 5,813,223 shares, or the Private Placement Common Shares, of our common stock, par value $0.0001 per share, or the Common Stock, and (ii) 437,927 shares of Common Stock, or the Private Placement Conversion Shares, issuable upon the conversion of 437,927 shares, or the Private Placement Preferred Shares, of Series B Non-Voting Convertible Preferred Stock, par value $0.0001, or the Series B Preferred Stock. Each share of Series B Preferred Stock is convertible into one share of Common Stock, subject to certain beneficial ownership limitations. The shares of Common Stock registered by the registration statement of which this prospectus forms a part are referred to herein as the “Resale Shares.”

The Private Placement Common Shares and the Private Placement Preferred Shares were issued and sold to certain institutional and accredited investors in a private placement, or the Private Placement, which closed on July 3, 2024. 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 or quoted at the time of sale, on the over-the-counter market, in one or more transactions otherwise than on these exchanges or systems, such as privately negotiated transactions, or using a combination of these methods, and at fixed prices, at prevailing market prices at the time of the sale, at varying prices determined at the time of sale, or at negotiated prices. See the disclosure under the heading “ Plan of Distribution ” elsewhere in this prospectus for more information about how the Selling Stockholders may sell or otherwise dispose of their Resale Shares hereunder.

The Selling Stockholders may sell any, all or none of the securities offered by this prospectus and we do not know when or in what amount the Selling Stockholders may sell their Resale Shares hereunder following the effective date of the registration statement of which