    <SEC-DOCUMENT>0001140361-24-042487-index.html : 20241001
    <SEC-HEADER>0001140361-24-042487.hdr.sgml : 20241001
    <ACCEPTANCE-DATETIME>20241001163647
    ACCESSION NUMBER:		0001140361-24-042487
    CONFORMED SUBMISSION TYPE:	424B7
    PUBLIC DOCUMENT COUNT:		9
    FILED AS OF DATE:		20241001
    DATE AS OF CHANGE:		20241001

    FILER:

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

    	FILING VALUES:
    		FORM TYPE:		424B7
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-281204
    		FILM NUMBER:		241343867

    	BUSINESS ADDRESS:
    		STREET 1:		704 QUINCE ORCHARD RD
    		CITY:			GAITHERSBURG
    		STATE:			MD
    		ZIP:			20878
    		BUSINESS PHONE:		617-923-1400

    	MAIL ADDRESS:
    		STREET 1:		704 QUINCE ORCHARD RD
    		CITY:			GAITHERSBURG
    		STATE:			MD
    		ZIP:			20878

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	SELECTA BIOSCIENCES INC
    		DATE OF NAME CHANGE:	20090109
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>424B7
    <SEQUENCE>1
    <FILENAME>ny20033174x7_424b7.htm
    <DESCRIPTION>424B7
    <TEXT>
    Document 1 - file: ny20033174x7_424b7.htm

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>logo_cartesian.jpg
    <TEXT>
    Document 2 - file: logo_cartesian.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>logo_cartesianx1.jpg
    <TEXT>
    Document 3 - file: logo_cartesianx1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>ny20033174x7_diagram01.jpg
    <TEXT>
    Document 4 - file: ny20033174x7_diagram01.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>ny20033174x7_diagram02.jpg
    <TEXT>
    Document 5 - file: ny20033174x7_diagram02.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>ny20033174x7_diagram03.jpg
    <TEXT>
    Document 6 - file: ny20033174x7_diagram03.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>ny20033174x7_linecharts01.jpg
    <TEXT>
    Document 7 - file: ny20033174x7_linecharts01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>ny20033174x7_linecharts02.jpg
    <TEXT>
    Document 8 - file: ny20033174x7_linecharts02.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>ny20033174x7_safety.jpg
    <TEXT>
    Document 9 - file: ny20033174x7_safety.jpg

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