<SEC-DOCUMENT>0001235468-21-000065.txt : 20210209
<SEC-HEADER>0001235468-21-000065.hdr.sgml : 20210209
<ACCEPTANCE-DATETIME>20210209170445
ACCESSION NUMBER:		0001235468-21-000065
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210208
FILED AS OF DATE:		20210209
DATE AS OF CHANGE:		20210209

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Rozdilsky Nicholas
		CENTRAL INDEX KEY:			0001774016

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-51813
		FILM NUMBER:		21607478

	MAIL ADDRESS:	
		STREET 1:		C/O 6931 ARLINGTON ROAD
		STREET 2:		SUITE 200
		CITY:			BETHESDA
		STATE:			MD
		ZIP:			20814

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			LIQUIDITY SERVICES INC
		CENTRAL INDEX KEY:			0001235468
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-BUSINESS SERVICES, NEC [7389]
		IRS NUMBER:				522209244
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0930

	BUSINESS ADDRESS:	
		STREET 1:		6931 ARLINGTON ROAD
		STREET 2:		SUITE 200
		CITY:			BETHESDA
		STATE:			MD
		ZIP:			20814
		BUSINESS PHONE:		2024676868

	MAIL ADDRESS:	
		STREET 1:		6931 ARLINGTON ROAD
		STREET 2:		SUITE 200
		CITY:			BETHESDA
		STATE:			MD
		ZIP:			20814
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_161290826344433.xml
<DESCRIPTION>FORM 4
<TEXT>
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    <periodOfReport>2021-02-08</periodOfReport>

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        <issuerCik>0001235468</issuerCik>
        <issuerName>LIQUIDITY SERVICES INC</issuerName>
        <issuerTradingSymbol>LQDT</issuerTradingSymbol>
    </issuer>

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            <rptOwnerName>Rozdilsky Nicholas</rptOwnerName>
        </reportingOwnerId>
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            <rptOwnerStreet1>C/O LIQUIDITY SERVICES, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>6931 ARLINGTON ROAD, SUITE 200</rptOwnerStreet2>
            <rptOwnerCity>BETHESDA</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>20814</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Marketing Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

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                <underlyingSecurityShares>
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                <sharesOwnedFollowingTransaction>
                    <value>25900</value>
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                    <value>9187.0</value>
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            <postTransactionAmounts>
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                    <value>9187</value>
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                <value>2030-12-01</value>
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                <underlyingSecurityTitle>
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                <underlyingSecurityShares>
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                <directOrIndirectOwnership>
                    <value>D</value>
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        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Grant</value>
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            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
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            <exerciseDate>
                <footnoteId id="F11"/>
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                <value>2025-01-01</value>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
                    <value>7000.0</value>
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                <sharesOwnedFollowingTransaction>
                    <value>7000</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Grant</value>
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            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
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            <exerciseDate>
                <footnoteId id="F12"/>
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            <expirationDate>
                <value>2025-01-01</value>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
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                <underlyingSecurityShares>
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                <sharesOwnedFollowingTransaction>
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                </sharesOwnedFollowingTransaction>
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    <footnotes>
        <footnote id="F1">Each restricted stock unit is the economic equivalent of one share of Liquidity Services, Inc. Common Stock.</footnote>
        <footnote id="F2">Twenty-five percent of this restricted stock grant vested on August 1, 2019 and thereafter, an additional 1/4th will vest on each of August 1, 2020, August 1, 2021, and August 1, 2022.</footnote>
        <footnote id="F3">Twenty-five percent of this option grant vested on August 1, 2019 and thereafter, an additional 1/48th will vest each month for thirty-six months.</footnote>
        <footnote id="F4">Twenty-five percent of this restricted stock unit grant vested on January 1, 2020 and thereafter, an additional 1/4th vests on each of January 1, 2021, January 1, 2022, and January 1, 2023.</footnote>
        <footnote id="F5">This option becomes exercisable, if at all, based on total shareholder return (TSR) milestones.  TSR is calculated based on the change in a the issuer's stock price during the performance period, taking into account any dividends paid during that period, which are assumed to be reinvested in the stock.</footnote>
        <footnote id="F6">15/48th of this option grant will vest on January 1, 2020 and thereafter, an additional 1/48th will vest each month for thirty-three months.</footnote>
        <footnote id="F7">Twenty-five percent of this restricted stock grant vested on January 1, 2021 and thereafter, an additional 1/4th vests on each of January 1, 2022, January 1, 2023 and January 1, 2024.</footnote>
        <footnote id="F8">12/48th of this option grant vested on January 1, 2021 and, thereafter, an additional 1/48th vests each month for thirty-six months.</footnote>
        <footnote id="F9">This option becomes exercisable, if at all, based on the Issuer's achievement of certain stock price appreciation milestones.</footnote>
        <footnote id="F10">12/48th of this option grant will vest on January 1, 2022 and thereafter, an additional 1/48th will vest each month for thirty-six months.</footnote>
        <footnote id="F11">These restricted stock units vest, if at all, based on the Issuer's achievement of certain stock price appreciation milestones.</footnote>
        <footnote id="F12">Twenty-five percent of this restricted stock unit grant will vest on January 1, 2022 and thereafter, an additional 1/4th will vest on each of January 1, 2023, January 1, 2024 and January 1, 2025.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Mark A. Shaffer, by power of attorney</signatureName>
        <signatureDate>2021-02-09</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</DOCUMENT>
</SEC-DOCUMENT>
