<SEC-DOCUMENT>0001127602-21-030112.txt : 20211202
<SEC-HEADER>0001127602-21-030112.hdr.sgml : 20211202
<ACCEPTANCE-DATETIME>20211202170026
ACCESSION NUMBER:		0001127602-21-030112
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20211201
FILED AS OF DATE:		20211202
DATE AS OF CHANGE:		20211202

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			GOEBEL DAVID
		CENTRAL INDEX KEY:			0001137523

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35914
		FILM NUMBER:		211467541

	MAIL ADDRESS:	
		STREET 1:		C/O APPLEBEE'S INTERNATIONAL, INC.
		STREET 2:		4551 W 107TH STREET
		CITY:			OVERLAND PARK
		STATE:			KS
		ZIP:			66207

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Murphy USA Inc.
		CENTRAL INDEX KEY:			0001573516
		STANDARD INDUSTRIAL CLASSIFICATION:	RETAIL-AUTO DEALERS & GASOLINE STATIONS [5500]
		IRS NUMBER:				462279221
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		200 PEACH STREET
		CITY:			EL DORADO
		STATE:			AR
		ZIP:			71730-5836
		BUSINESS PHONE:		(870) 875-7600

	MAIL ADDRESS:	
		STREET 1:		200 PEACH STREET
		CITY:			EL DORADO
		STATE:			AR
		ZIP:			71730-5836
</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>2021-12-01</periodOfReport>

    <issuer>
        <issuerCik>0001573516</issuerCik>
        <issuerName>Murphy USA Inc.</issuerName>
        <issuerTradingSymbol>MUSA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001137523</rptOwnerCik>
            <rptOwnerName>GOEBEL DAVID</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 E. PEACH STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>EL DORADO</rptOwnerCity>
            <rptOwnerState>AR</rptOwnerState>
            <rptOwnerZipCode>71730</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Dividend Equivalent Units</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2021-12-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>0.332</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>0.332</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0.332</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Reflects the accrual of dividend equivalent units on outstanding restricted stock units (&quot;RSUs&quot;) granted to the Reporting Person under the 2013 Stock Plan for Non-employee Directors. Each dividend equivalent unit reflects the right to receive one share of common stock, subject to the terms and conditions (including vesting and settlement terms) applicable to the corresponding RSUs.</footnote>
        <footnote id="F2">Reflects the accrual of dividend equivalent units on RSUs granted to the Reporting Person on February 8, 2021.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Gregory L. Smith, attorney-in-fact</signatureName>
        <signatureDate>2021-12-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
