<SEC-DOCUMENT>0001127602-22-017270.txt : 20220610
<SEC-HEADER>0001127602-22-017270.hdr.sgml : 20220610
<ACCEPTANCE-DATETIME>20220610183351
ACCESSION NUMBER:		0001127602-22-017270
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20220523
FILED AS OF DATE:		20220610
DATE AS OF CHANGE:		20220610

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			RICCIARDI NATALE S
		CENTRAL INDEX KEY:			0001107158

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40592
		FILM NUMBER:		221010258

	MAIL ADDRESS:	
		STREET 1:		C/O MORRIS COMMUNICATIONS CORP
		STREET 2:		725 BROAD ST.
		CITY:			AUGUSTA
		STATE:			GA
		ZIP:			30903

	FORMER NAME:	
		FORMER CONFORMED NAME:	RICCARDI NATALE S
		DATE OF NAME CHANGE:	20000216

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>form4.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2022-05-23</periodOfReport>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001107158</rptOwnerCik>
            <rptOwnerName>RICCIARDI NATALE S</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>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>4.50</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2022-05-23</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>12500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2032-05-22</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>12500</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12500</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The option shall vest and become exercisable in full on the earlier of (i) the first anniversary of the Grant Date, or (ii) the day immediately prior to the date of the next annual meeting of the stockholders of the Company provided that the Reporting Person remains in continuous service on such vesting date.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Jonathan Paris, Attorney-in-Fact for Natale S. Ricciardi</signatureName>
        <signatureDate>2022-06-10</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
