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

    <schemaVersion>X0303</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2010-08-09</periodOfReport>

    <dateOfOriginalSubmission>2010-08-09</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001386926</issuerCik>
        <issuerName>KKR Financial Holdings LLC</issuerName>
        <issuerTradingSymbol>KFN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001200084</rptOwnerCik>
            <rptOwnerName>STROTHOTTE WILLY R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O KKR FINANCIAL HOLDINGS LLC</rptOwnerStreet1>
            <rptOwnerStreet2>555 CALIFORNIA STREET, 50TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94104</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Phantom Shares</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2010-08-09</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>7865</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>8.9</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>7865</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>109145.9</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">This amendment is being filed to correct the Form 4 filed on August 9, 2010 in which the Reporting Person reported a grant of 7,865 restricted common shares on August 9, 2010.  The Form should have reported instead the grant of 7,865 Phantom Shares on such date.</footnote>
        <footnote id="F2">Each phantom share is the economic equivalent of one common share. The phantom shares vest in one-third increments on August 9, 2011, August 9, 2012 and August 9, 2013, and become payable, in cash or common shares, at the election of the Company, upon the earlier of (i) the first day of January following the reporting person's termination of service as a director or (ii) an election date pre-selected by the reporting person, and in any event in cash or common shares, at the election of the reporting person, upon the occurrence of a change in control of the Company.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Willy R Strothotte</signatureName>
        <signatureDate>2011-07-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
