# EDGAR Filing Document

**Accession Number:** 0001453687
**File Stem:** 0001453687-26-000071
**Filing Date:** 2026-4
**Character Count:** 2525
**Document Hash:** 7270c3dc87275d0740e3f8e6faf6e722
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001453687-26-000071.hdr.sgml**: 20260428

**ACCESSION NUMBER**: 0001453687-26-000071

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260428

**DATE AS OF CHANGE**: 20260428

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Cartesian Therapeutics, Inc.
- **CENTRAL INDEX KEY:** 0001453687
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-37798
- **FILM NUMBER:** 26903148

**BUSINESS ADDRESS:**
- **STREET 1:** 7495 NEW HORIZON WAY
- **CITY:** FREDERICK
- **STATE:** MD
- **ZIP:** 21703
- **BUSINESS PHONE:** 301-348-8698

**MAIL ADDRESS:**
- **STREET 1:** 7495 NEW HORIZON WAY
- **CITY:** FREDERICK
- **STATE:** MD
- **ZIP:** 21703

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** SELECTA BIOSCIENCES INC
- **DATE OF NAME CHANGE:** 20090109

    

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, DC 20549**

**SCHEDULE 14A**

**(Rule 14a-101)**

**INFORMATION REQUIRED IN PROXY STATEMENT**

**SCHEDULE 14A INFORMATION**

**Proxy Statement Pursuant to Section 14(a) of the**

**Securities Exchange Act of 1934**

**(Amendment No.&nbsp;&nbsp;&nbsp;&nbsp;)**

Filed by the Registrant&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;🗹 Filed by a Party other than the Registrant&nbsp;&nbsp;&nbsp;&nbsp; □

Check the appropriate box:

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| | |
|:---|:---|
| □ | Preliminary Proxy Statement |
| □ | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| □ | Definitive Proxy Statement |
| 🗹 | Definitive Additional Materials |
| □ | Soliciting Material Pursuant to § 240.14a-12 |

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**CARTESIAN THERAPEUTICS, INC.**

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement if Other Than the Registrant)

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| | |
|:---|:---|
| Payment of Filing Fee (Check the appropriate box) | Payment of Filing Fee (Check the appropriate box) |
| 🗹 | No fee required. |
| □ | Fee previously paid with preliminary materials |
| □ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |

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![cartesiantherapeuticsinc_vb.jpg](cartesiantherapeuticsinc_vb.jpg)

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![cartesiantherapeuticsinc_vc.jpg](cartesiantherapeuticsinc_vc.jpg)

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