<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0407</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2023-07-13</periodOfReport>

    <issuer>
        <issuerCik>0001839839</issuerCik>
        <issuerName>Janus International Group, Inc.</issuerName>
        <issuerTradingSymbol>JBI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001539165</rptOwnerCik>
            <rptOwnerName>Leonard Colin</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O JANUS INTERNATIONAL GROUP, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>135 JANUS INTERNATIONAL BLVD.</rptOwnerStreet2>
            <rptOwnerCity>TEMPLE</rptOwnerCity>
            <rptOwnerState>GA</rptOwnerState>
            <rptOwnerZipCode>30179</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>false</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2023-07-13</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>13274</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>15306</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F3"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">These restricted stock units (&quot;RSUs&quot;) were issued to Mr. Leonard on June 7, 2022, and were held for the benefit of Clearlake Capital Partners IV (AIV-Jupiter), L.P. (&quot;CCPIV&quot;), Clearlake Capital Partners IV (Offshore), L.P. (&quot;CCPIV Offshore&quot;), Clearlake Capital Partners IV (AIV-Jupiter) USTE, L.P. (&quot;CCPIV USTE&quot;), Clearlake Capital Partners V, L.P. (&quot;CCPV&quot;), Clearlake Capital Partners V (Offshore), L.P. (&quot;CCPV Offshore&quot;), Clearlake Capital Partners V (USTE), L.P. (&quot;CCPV USTE&quot; and together with CCPIV, CCPIV Offshore, CCPIV USTE, CCPV, and CCPV Offshore, the &quot;Clearlake Funds&quot;).  These RSUs vested on June 7, 2023, and were transferred to the Clearlake Funds on July 13, 2023.</footnote>
        <footnote id="F2">This amount has been adjusted to reflect that the 12,594 shares of Common Stock underlying RSUs granted to Mr. Leonard on December 22, 2021, which vested on June 8, 2022, were transferred to the Clearlake Funds on August 26, 2022.</footnote>
        <footnote id="F3">These RSUs are held of record by Mr. Leonard for the benefit of the Clearlake Funds and will be transferred to the Clearlake Funds upon vesting and settlement. Mr. Leonard expressly disclaims beneficial ownership of these securities.</footnote>
    </footnotes>

    <remarks>Exhibit List: Exhibit 24 - Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>/s/ Elliot Kahler, as Attorney-in-Fact for Colin Leonard</signatureName>
        <signatureDate>2023-07-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
