<SEC-DOCUMENT>0001380106-23-000154.txt : 20230816
<SEC-HEADER>0001380106-23-000154.hdr.sgml : 20230816
<ACCEPTANCE-DATETIME>20230816191321
ACCESSION NUMBER:		0001380106-23-000154
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20230815
FILED AS OF DATE:		20230816
DATE AS OF CHANGE:		20230816

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Spignesi Robert G. Jr.
		CENTRAL INDEX KEY:			0001853904

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40592
		FILM NUMBER:		231179464

	MAIL ADDRESS:	
		STREET 1:		C/O RAPID MICRO BIOSYSTEMS, INC.
		STREET 2:		1001 PAWTUCKET BOULEVARD WEST, SUITE 280
		CITY:			LOWELL
		STATE:			MA
		ZIP:			01854

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			RAPID MICRO BIOSYSTEMS, INC.
		CENTRAL INDEX KEY:			0001380106
		STANDARD INDUSTRIAL CLASSIFICATION:	LABORATORY ANALYTICAL INSTRUMENTS [3826]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1001 PAWTUCKET BLVD.
		CITY:			LOWELL
		STATE:			MA
		ZIP:			01854
		BUSINESS PHONE:		978-349-3200

	MAIL ADDRESS:	
		STREET 1:		1001 PAWTUCKET BLVD.
		CITY:			LOWELL
		STATE:			MA
		ZIP:			01854

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	RAPID MICRO BIOSYSTEMS INC
		DATE OF NAME CHANGE:	20061103
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_169222757955521.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2023-08-15</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001380106</issuerCik>
        <issuerName>RAPID MICRO BIOSYSTEMS, INC.</issuerName>
        <issuerTradingSymbol>RPID</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001853904</rptOwnerCik>
            <rptOwnerName>Spignesi Robert G. Jr.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O RAPID MICRO BIOSYSTEMS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>1001 PAWTUCKET BOULEVARD WEST, SUITE 280</rptOwnerStreet2>
            <rptOwnerCity>LOWELL</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01854</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>PRESIDENT AND CEO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2023-08-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>20000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.9744</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>375512</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The reported price in Column 4 is a weighted average purchase price. These shares were purchased in multiple transactions at prices ranging from $0.920 to $1.000 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Jonathan Paris, Attorney-in-Fact for Robert G. Spignesi, Jr.</signatureName>
        <signatureDate>2023-08-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
