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

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-08-28</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001069183</issuerCik>
        <issuerName>AXON ENTERPRISE, INC.</issuerName>
        <issuerTradingSymbol>AXON</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002017144</rptOwnerCik>
            <rptOwnerName>Brooks Cameron</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>17800 NORTH 85TH STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SCOTTSDALE</rptOwnerCity>
            <rptOwnerState>AZ</rptOwnerState>
            <rptOwnerZipCode>85255</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CHIEF REVENUE OFFICER</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2025-08-28</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>31620</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>50318</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2025-10-31</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F2"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>5850</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>711.34</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>44468</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The transaction consists of performance-based restricted stock units (collectively, &quot;XSUs&quot;) granted on April 1, 2024 pursuant to the Axon Enterprise, Inc. 2024 eXponential Stock Plan, for which the performance conditions for the first and second tranches of XSUs (each, a &quot;Tranche&quot;) were certified by the issuer's Compensation Committee of the Board of Directors on August 28, 2025 as having been met. The first Tranche vested on October 1, 2025 and the second Tranche will vest on April 1, 2026, in each case subject to continued employment through such dates. Following each vesting, the shares deliverable for each Tranche is subject to a minimum holding period until the earlier of (i) December 31, 2030 and (ii) the date on which a subsequent tranche of XSUs vests, excluding shares withheld or sold to cover applicable taxes.</footnote>
        <footnote id="F2">Securities disposed represent securities withheld to settle the reporting person's tax liability arising out of the vesting of the first Tranche.</footnote>
    </footnotes>

    <remarks>This Form 4 reports transactions relating to the first and second Tranches of the reporting person's Axon Enterprise, Inc. 2024 eXponential Stock Plan award. The performance conditions applicable to these Tranches were certified by the Compensation Committee of the issuer's Board of Directors on August 28, 2025 as having been met. Due to an administrative error, the issuer is filing this Form 4 late. The vest date for the first Tranche was October 1, 2025, and such shares were released to the reporting person on October 31, 2025, consistent with the award's terms.</remarks>

    <ownerSignature>
        <signatureName>/s/ Cameron Brooks by Isaiah Fields, Attorney-in-Fact</signatureName>
        <signatureDate>2025-11-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
