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

    <schemaVersion>X0609</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-09-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001517375</issuerCik>
        <issuerName>Sprout Social, Inc.</issuerName>
        <issuerTradingSymbol>SPT</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001791914</rptOwnerCik>
            <rptOwnerName>Barretto Ryan Paul</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>131 SOUTH DEARBORN ST.</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 700</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60603</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2026-09-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>13323</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>11.47</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1356752</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>119775</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">After giving effect to the transaction reported herein, the total reported in column 5 includes:  (1) 15,000 reported restricted stock units (&quot;RSUs&quot;) which vest in 2 equal quarterly installments beginning on December 1, 2026; (2) 7,518 reported RSUs which vest in 2 equal quarterly installments beginning on December 1, 2026; (3) 26,078 reported RSUs which vest in 6 equal quarterly installments beginning on December 1, 2026; (4) 50,063 reported RSUs which vest in 9 equal quarterly installments beginning on October 1, 2026; (5) 182,482 reported RSUs which will vest in 10 equal quarterly installments beginning on December 1, 2026; and (6) 546,448 RSUs of which 1/3 will vest on March 1, 2027 with the remaining RSUs vesting in 8 equal quarterly installments beginning on June 1, 2027.</footnote>
        <footnote id="F2">Each RSU represents the contingent right to receive one share of Class A Common Stock of the Issuer and does not expire.</footnote>
        <footnote id="F3">This amount represents: (i) 60,000 shares of Issuer Class A Common Stock held by the Ryan Paul Barretto 2020 Gift Trust, of which Mr. Barretto's spouse is the sole trustee; and (ii) 59,775 shares of Issuer Class A Common Stock held by the Ryan Paul Barretto Revocable Trust, of which Mr. Barretto serves as the sole trustee.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Heidi Jonas, Attorney-in-fact for Ryan Paul Barretto</signatureName>
        <signatureDate>2026-09-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
