<SEC-DOCUMENT>0001104659-21-059345.txt : 20210430
<SEC-HEADER>0001104659-21-059345.hdr.sgml : 20210430
<ACCEPTANCE-DATETIME>20210430205040
ACCESSION NUMBER:		0001104659-21-059345
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20201222
FILED AS OF DATE:		20210430
DATE AS OF CHANGE:		20210430

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Knopp Kevin J.
		CENTRAL INDEX KEY:			0001836523

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39815
		FILM NUMBER:		21880869

	MAIL ADDRESS:	
		STREET 1:		C/O 908 DEVICES INC.
		STREET 2:		645 SUMMER STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			908 Devices Inc.
		CENTRAL INDEX KEY:			0001555279
		STANDARD INDUSTRIAL CLASSIFICATION:	MEASURING & CONTROLLING DEVICES, NEC [3829]
		IRS NUMBER:				454524096
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		645 SUMMER STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210
		BUSINESS PHONE:		978-729-4478

	MAIL ADDRESS:	
		STREET 1:		645 SUMMER STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>tm2114833-2_4seq1.xml
<DESCRIPTION>OWNERSHIP DOCUMENT
<TEXT>
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    <periodOfReport>2020-12-22</periodOfReport>

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        <issuerName>908 Devices Inc.</issuerName>
        <issuerTradingSymbol>MASS</issuerTradingSymbol>
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            <rptOwnerName>Knopp Kevin J.</rptOwnerName>
        </reportingOwnerId>
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            <rptOwnerStreet1>C/O 908 DEVICES INC.</rptOwnerStreet1>
            <rptOwnerStreet2>645 SUMMER STREET</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02210</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President and CEO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
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                <directOrIndirectOwnership>
                    <value>I</value>
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    <footnotes>
        <footnote id="F1">The original Form 4, filed December 22, 2020, is being amended by this Form 4 amendment solely to correct an administrative error related to the nature of the beneficial ownership of shares held by the reporting person. Due to an administrative error, those shares were reported as being held directly by the reporting person, instead of held indirectly through the reporting person's trust, for which the reporting person may be deemed to be the beneficial owner. This Form 4 corrects such error by adding line items for the amount of securities indirectly owned by the reporting person's trust and decreasing the total amount of securities directly owned by the reporting person accordingly.</footnote>
        <footnote id="F2">Each share of Series A Preferred Stock, Series B Preferred Stock and Series D Preferred Stock (collectively, the &quot;Preferred Shares&quot;) converted into 0.61459 shares of the Issuer's Common Stock automatically upon the closing of the Issuer's initial public offering without payment of additional consideration. The Preferred Shares were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering, and had no expiration date.</footnote>
        <footnote id="F3">The shares are owned directly by The Kevin J. Knopp Irrevocable Trust of 2018. The reporting person's brother-in-law is the trustee of The Kevin J. KnoppIrrevocable Trust of 2018 and has sole voting and dispositive control with respect to all securities held by such trust. The reporting person may be deemed tobe the beneficial owner of the securities held by The Kevin J. Knopp Irrevocable Trust of 2018.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Michael S. Turner, as Attorney-in-Fact</signatureName>
        <signatureDate>2021-04-30</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
