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

    <schemaVersion>X0609</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-07-31</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001819974</issuerCik>
        <issuerName>SkyWater Technology, LLC</issuerName>
        <issuerTradingSymbol>SKYT</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001353135</rptOwnerCik>
            <rptOwnerName>Goetz Dennis J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>2401 EAST 86TH STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BLOOMINGTON</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55425</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>2026-07-31</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>23713</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
                <footnoteId id="F2"/>
            </securityTitle>
            <transactionDate>
                <value>2026-07-31</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>4304</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares of common stock of SkyWater Technology, Inc. (&quot;SkyWater&quot;) disposed of pursuant to the consummation of the transactions contemplated by the Agreement and Plan of Merger (the &quot;Merger Agreement&quot;), dated as of January 25, 2026, by and among SkyWater, IonQ, Inc. (&quot;IonQ&quot;), Merger Subsidiary 1 Inc. (&quot;Merger Subsidiary 1&quot;), and Iris merger Subsidiary 2 LLC (now known as SkyWater Technology, LLC) (&quot;Surviving Company&quot;), including the merger of Iris Merger Subsidiary 1 with and into Surviving Company (the &quot;Second Merger&quot;). At the effective time of the First Merger (the &quot;Effective Time&quot;), each share of SkyWater common stock outstanding immediately prior to the Effective Time (subject to certain exceptions described in the Merger Agreement) automatically converted into the right to receive $15 in cash and 0.4883 shares of common stock of IonQ plus cash in lieu of any fractional shares.</footnote>
        <footnote id="F2">Represents restricted stock units relating to shares of SkyWater common stock. Pursuant to the Merger Agreement, prior to the Effective Time, each award of restricted stock units relating to shares of SkyWater common stock held by a non-employee member of SkyWater's board of directors that was outstanding, whether vested or unvested, automatically became fully vested and settled in shares of SkyWater common stock. At the Effective Time, each share of SkyWater common stock automatically converted into the right to receive $15 in cash and 0.4883 shares of common stock of IonQ plus cash in lieu of any fractional shares.</footnote>
    </footnotes>

    <remarks>AS NOTED IN FOOTNOTE 1, IN THE SECOND MERGER, SKYWATER MERGED WITH AND INTO SKYWATER TECHNOLOGY, LLC (FORMERLY KNOWN AS IRIS MERGER SUBSIDIARY 2 LLC), WITH SKYWATER TECHNOLOGY, LLC SURVIVING THE MERGER.</remarks>

    <ownerSignature>
        <signatureName>/s/ Christopher Hilberg, Attorney-in-Fact</signatureName>
        <signatureDate>2026-07-31</signatureDate>
    </ownerSignature>
</ownershipDocument>
