<SEC-DOCUMENT>0001453687-24-000067.txt : 20240410
<SEC-HEADER>0001453687-24-000067.hdr.sgml : 20240410
<ACCEPTANCE-DATETIME>20240410214715
ACCESSION NUMBER:		0001453687-24-000067
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20240408
FILED AS OF DATE:		20240410
DATE AS OF CHANGE:		20240410

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Singer Michael
		CENTRAL INDEX KEY:			0002000122
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37798
		FILM NUMBER:		24836999

	MAIL ADDRESS:	
		STREET 1:		C/O CARTESIAN THERAPEUTICS, INC.
		STREET 2:		704 QUINCE ORCHARD RD
		CITY:			GAITHERSBURG
		STATE:			MD
		ZIP:			20878

ISSUER:		

	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

	BUSINESS ADDRESS:	
		STREET 1:		65 GROVE STREET
		CITY:			WATERTOWN
		STATE:			MA
		ZIP:			02472
		BUSINESS PHONE:		617-923-1400

	MAIL ADDRESS:	
		STREET 1:		65 GROVE STREET
		CITY:			WATERTOWN
		STATE:			MA
		ZIP:			02472

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SELECTA BIOSCIENCES INC
		DATE OF NAME CHANGE:	20090109
</SEC-HEADER>
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        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">On March 27, 2024, the issuer held a special meeting of stockholders (the &quot;Special Meeting&quot;). At the Special Meeting, the stockholders of the issuer approved a 1-for-30 reverse stock split (the &quot;Reverse Stock Split&quot;) of the issuer's common stock (&quot;Common Stock&quot;) and the conversion of the issuer's Series A Non-Voting Convertible Preferred Stock (&quot;Series A Preferred Stock&quot;) into shares of Common Stock. On April 8, 2024, the conversion of the majority of the shares of Series A Preferred Stock occurred automatically (the &quot;Automatic Conversion&quot;). The remaining shares of Series A Preferred Stock remain subject to certain beneficial ownership limitations described in the issuer's filings with the Securities and Exchange Commission. At the time of the Automatic Conversion, all of the reporting person's shares of Series A Preferred Stock converted into shares of Common Stock.</footnote>
        <footnote id="F2">On April 4, 2024, the issuer effected the Reverse Stock Split. The amount of securities reported on this Form 4 has been adjusted to reflect the Reverse Stock Split.</footnote>
        <footnote id="F3">Shares are held in a trust for the benefit of the reporting person's spouse and children. The reporting person's spouse is a trustee of this trust.</footnote>
        <footnote id="F4">Shares are held in a trust for which the reporting person is a beneficiary. The reporting person is a trustee of this trust.</footnote>
        <footnote id="F5">Shares are held in a trust for which the reporting person is a beneficiary. The reporting person's spouse is a trustee of this trust.</footnote>
        <footnote id="F6">Shares are held by the reporting person's spouse.</footnote>
        <footnote id="F7">The shares are held for LS, the child of the reporting person, through a custodial account established pursuant to the Uniform Transfer to Minors Act (&quot;UTMA&quot;) for which the reporting person serves as custodian.</footnote>
        <footnote id="F8">The shares are held for SS, the child of the reporting person, through a custodial account established pursuant to the UTMA for which the reporting person serves as custodian.</footnote>
        <footnote id="F9">This award will vest in 36 equal monthly installments, so that it shall be fully vested on the third anniversary of the date of grant.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Matthew Bartholomae, Attorney-in-Fact for Michael Singer</signatureName>
        <signatureDate>2024-04-10</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
