<SEC-DOCUMENT>0000866273-25-000002.txt : 20250103
<SEC-HEADER>0000866273-25-000002.hdr.sgml : 20250103
<ACCEPTANCE-DATETIME>20250103112304
ACCESSION NUMBER:		0000866273-25-000002
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20250101
FILED AS OF DATE:		20250103
DATE AS OF CHANGE:		20250103

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MILLER JAMES HARRY
		CENTRAL INDEX KEY:			0001608365
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15461
		FILM NUMBER:		25504385

	MAIL ADDRESS:	
		STREET 1:		5100 EAST SKELLY DRIVE
		STREET 2:		SUITE 700
		CITY:			TULSA
		STATE:			OK
		ZIP:			74135

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MATRIX SERVICE CO
		CENTRAL INDEX KEY:			0000866273
		STANDARD INDUSTRIAL CLASSIFICATION:	CONSTRUCTION SPECIAL TRADE CONTRACTORS [1700]
		ORGANIZATION NAME:           	05 Real Estate & Construction
		IRS NUMBER:				731352174
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0630

	BUSINESS ADDRESS:	
		STREET 1:		15 EAST 5TH STREET
		STREET 2:		SUITE 1100
		CITY:			TULSA
		STATE:			OK
		ZIP:			74103
		BUSINESS PHONE:		9188388822

	MAIL ADDRESS:	
		STREET 1:		15 EAST 5TH STREET
		STREET 2:		SUITE 1100
		CITY:			TULSA
		STATE:			OK
		ZIP:			74103
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wk-form4_1735921377.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-01-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000866273</issuerCik>
        <issuerName>MATRIX SERVICE CO</issuerName>
        <issuerTradingSymbol>MTRX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001608365</rptOwnerCik>
            <rptOwnerName>MILLER JAMES HARRY</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>15 EAST 5TH STREET</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 1100</rptOwnerStreet2>
            <rptOwnerCity>TULSA</rptOwnerCity>
            <rptOwnerState>OK</rptOwnerState>
            <rptOwnerZipCode>74103</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>COMMON STOCK</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <transactionDate>
                <value>2025-01-01</value>
                <footnoteId id="F2"/>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>5</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value>E</value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>418</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>11.97</value>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>84092</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">MATRIX SERVICE COMPANY COMMON STOCK PURCHASED VIA THE MATRIX SERVICE COMPANY 2011 EMPLOYEE STOCK PURCHASE PLAN (&quot;THE ESPP&quot;) IN A TRANSACTION THAT WAS EXEMPT UNDER BOTH RULE 16b-3(c) AND RULE 16b-3(d) AND IS VOLUNTARILY REPORTED.</footnote>
        <footnote id="F2">SHARES WERE PURCHASED VIA THE ESPP. THE OFFERING PERIOD CONSISTED OF THE THREE MONTHS ENDED DECEMBER 31, 2024. THE SHARES WERE ACQUIRED ON THE FIRST DAY AFTER THE END OF THE OFFERING PERIOD.</footnote>
        <footnote id="F3">PER THE ESPP, THE PURCHASE PRICE WAS DETERMINED BY THE LAST CLOSING CONSOLIDATED BID PRICE PER SHARE ON THE PURCHASE DATE.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>James H. Miller</signatureName>
        <signatureDate>2025-01-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
