<SEC-DOCUMENT>0001395942-21-000028.txt : 20210304
<SEC-HEADER>0001395942-21-000028.hdr.sgml : 20210304
<ACCEPTANCE-DATETIME>20210304174503
ACCESSION NUMBER:		0001395942-21-000028
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210302
FILED AS OF DATE:		20210304
DATE AS OF CHANGE:		20210304

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Price Lisa A.
		CENTRAL INDEX KEY:			0001580036

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34568
		FILM NUMBER:		21715557

	MAIL ADDRESS:	
		STREET 1:		13085 HAMILTON CROSSING BLVD.
		CITY:			CARMEL
		STATE:			IN
		ZIP:			46032

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			KAR Auction Services, Inc.
		CENTRAL INDEX KEY:			0001395942
		STANDARD INDUSTRIAL CLASSIFICATION:	RETAIL-AUTO DEALERS & GASOLINE STATIONS [5500]
		IRS NUMBER:				208744739
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		11299 N. ILLINOIS STREET
		CITY:			CARMEL
		STATE:			IN
		ZIP:			46032
		BUSINESS PHONE:		(800) 923-3725

	MAIL ADDRESS:	
		STREET 1:		11299 N. ILLINOIS STREET
		CITY:			CARMEL
		STATE:			IN
		ZIP:			46032

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	KAR Holdings, Inc.
		DATE OF NAME CHANGE:	20070409
</SEC-HEADER>
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<TYPE>4
<SEQUENCE>1
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<DESCRIPTION>FORM 4
<TEXT>
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    <periodOfReport>2021-03-02</periodOfReport>

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        <issuerName>KAR Auction Services, Inc.</issuerName>
        <issuerTradingSymbol>KAR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001580036</rptOwnerCik>
            <rptOwnerName>Price Lisa A.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O: KAR AUCTION SERVICES, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>11299 NORTH ILLINOIS STREET</rptOwnerStreet2>
            <rptOwnerCity>CARMEL</rptOwnerCity>
            <rptOwnerState>IN</rptOwnerState>
            <rptOwnerZipCode>46032</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EVP, Chief People Officer</officerTitle>
            <otherText></otherText>
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    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
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            <transactionDate>
                <value>2021-03-02</value>
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                <transactionPricePerShare>
                    <value>0</value>
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            <exerciseDate>
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            <expirationDate>
                <footnoteId id="F5"/>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>400.0</value>
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            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
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            <underlyingSecurity>
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                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                </underlyingSecurityShares>
            </underlyingSecurity>
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                </sharesOwnedFollowingTransaction>
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                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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                    <value>Common Stock</value>
                </underlyingSecurityTitle>
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                <underlyingSecurityTitle>
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    <footnotes>
        <footnote id="F1">Each restricted stock unit is convertible into a share of common stock on a 1-for-1 basis. The restricted stock units vested in common stock on March 2, 2021.</footnote>
        <footnote id="F2">Includes 3,965.7249 shares acquired pursuant to the Company's Employee Stock Purchase Plan.</footnote>
        <footnote id="F3">Shares withheld by the Company to satisfy tax withholding requirements.</footnote>
        <footnote id="F4">Each restricted stock unit is convertible into a share of common stock on a 1-for-1 basis.</footnote>
        <footnote id="F5">These restricted stock units were subject to a time-vesting requirement and vested and settled in common stock as follows: one-third of these restricted stock units vested on March 2, 2019, one-third of these restricted stock units vested on March 2, 2020 and the remaining one-third of these restricted stock units vested on March 2, 2021.</footnote>
        <footnote id="F6">These restricted stock units remain subject to a time-vesting requirement and are scheduled to vest and settle in common stock as follows: one-third of these restricted stock units vested on February 22, 2020, one-third of these restricted stock units vested on February 22, 2021 and the remaining one-third of these restricted stock units vest on February 22, 2022, assuming continued employment through the applicable vesting date.</footnote>
        <footnote id="F7">These restricted stock units were subject to a time-vesting requirement and vested and settled in common stock on March 2, 2021.</footnote>
        <footnote id="F8">These restricted stock units remain subject to a time-vesting requirement and are scheduled to vest and settle in common stock on February 22, 2022, assuming continued employment through the applicable vesting date.</footnote>
        <footnote id="F9">These restricted stock units remain subject to a time-vesting requirement and are scheduled to vest and settle in common stock as follows: one-third of these restricted stock units vested on February 21, 2021, one-third of these restricted stock units vest on February 21, 2022 and the remaining one-third of these restricted stock units vest on February 21, 2023, assuming continued employment through the applicable vesting date.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Charles S. Coleman as Attorney-In-Fact</signatureName>
        <signatureDate>2021-03-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</DOCUMENT>
</SEC-DOCUMENT>
