<SEC-DOCUMENT>0001127602-25-018375.txt : 20250701
<SEC-HEADER>0001127602-25-018375.hdr.sgml : 20250701
<ACCEPTANCE-DATETIME>20250701162926
ACCESSION NUMBER:		0001127602-25-018375
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20250630
FILED AS OF DATE:		20250701
DATE AS OF CHANGE:		20250701

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Taylor Jack T
		CENTRAL INDEX KEY:			0001570352
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35914
		FILM NUMBER:		251096786

	MAIL ADDRESS:	
		STREET 1:		488 8TH AVENUE
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92101

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Murphy USA Inc.
		CENTRAL INDEX KEY:			0001573516
		STANDARD INDUSTRIAL CLASSIFICATION:	RETAIL-AUTO DEALERS & GASOLINE STATIONS [5500]
		ORGANIZATION NAME:           	07 Trade & Services
		EIN:				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>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-06-30</periodOfReport>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001570352</rptOwnerCik>
            <rptOwnerName>Taylor Jack T</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 PEACH STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>EL DORADO</rptOwnerCity>
            <rptOwnerState>AR</rptOwnerState>
            <rptOwnerZipCode>71730</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Unit</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2025-06-30</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>79.892</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
                <footnoteId id="F3"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>79.892</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>819.972</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Award granted under the 2023 Omnibus Incentive Plan.</footnote>
        <footnote id="F2">These Securities generally do not carry a Conversion Price, Exercisable Date, or Expiration Date.</footnote>
        <footnote id="F3">Represent fully-vested RSUs issued in lieu of the reporting person's quarterly cash retainer(s). The reporting person has elected to defer settlement of RSUs and accrued dividend equivalent units thereon to the reporting person's termination of service from the Board, in accordance with their deferral election form.</footnote>
        <footnote id="F4">Includes dividend equivalent units accrued with respect to the underlying RSUs.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Gregory L. Smith, attorney-in-fact</signatureName>
        <signatureDate>2025-07-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
