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<!-- Generated by Broadridge Transform (tm) - http://www.broadridge.com -->
<!-- Created: Wed Sep 23 20:05:18 UTC 2026 -->
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  <labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <loc xlink:type="locator" xlink:label="mtrx_ChangedPeerGroupTotalShareholderReturnAmount" xlink:href="mtrx-20261103.xsd#mtrx_ChangedPeerGroupTotalShareholderReturnAmount"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mtrx_ChangedPeerGroupTotalShareholderReturnAmount_lbl" xml:lang="en-US">Changed Peer Group Total Shareholder Return Amount</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mtrx_ChangedPeerGroupTotalShareholderReturnAmount_lbl0" xml:lang="en-US">The calculated total shareholder return if the old peer group had been used.</label>
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