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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2018-03-07</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001366340</issuerCik>
        <issuerName>FINJAN HOLDINGS, INC.</issuerName>
        <issuerTradingSymbol>FNJN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001731812</rptOwnerCik>
            <rptOwnerName>Halcyon Long Duration Recoveries Management LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>477 MADISON AVENUE, 8TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001734554</rptOwnerCik>
            <rptOwnerName>Halcyon Management Partners GP LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>477 MADISON AVENUE, 8TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001713544</rptOwnerCik>
            <rptOwnerName>Bader John M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>447 MADISON AVENUE, 8TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001713578</rptOwnerCik>
            <rptOwnerName>Dillow Jason</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>447 MADISON AVENUE, 8TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001616416</rptOwnerCik>
            <rptOwnerName>Halcyon Management Partners LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>477 MADISON AVENUE, 8TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001734528</rptOwnerCik>
            <rptOwnerName>HLDR Management GP LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>477 MADISON AVENUE, 8TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001734522</rptOwnerCik>
            <rptOwnerName>Halcyon Management Holdings GP LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>477 MADISON AVENUE, 8TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>569977</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F8"/>
                    <footnoteId id="F9"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>88012</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F8"/>
                    <footnoteId id="F9"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>149733</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F8"/>
                    <footnoteId id="F9"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>254246</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F4"/>
                    <footnoteId id="F8"/>
                    <footnoteId id="F9"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>99838</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F5"/>
                    <footnoteId id="F8"/>
                    <footnoteId id="F9"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>755115</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F6"/>
                    <footnoteId id="F8"/>
                    <footnoteId id="F9"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Warrant (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>3.18</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2017-09-19</value>
            </exerciseDate>
            <expirationDate>
                <value>2020-06-19</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2355506</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F7"/>
                    <footnoteId id="F8"/>
                    <footnoteId id="F9"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Securities of Finjan Holdings, Inc. (the &quot;Issuer&quot;) held directly by CAZ Halcyon Strategic Opportunities Fund, LP (&quot;CAZ Halcyon&quot;).  Halcyon Long Duration Recoveries Management LP (&quot;HLDR&quot;), through investment management and/or other governance agreements, may be deemed to indirectly beneficially own the securities of the Issuer held directly by CAZ Halcyon because HLDR has voting and investment power over such securities.</footnote>
        <footnote id="F2">Securities of the Issuer held directly by CAZ Halcyon Offshore Strategic Opportunities Fund, LP (&quot;CAZ Offshore&quot;).  HLDR, through investment management and/or other governance agreements, may be deemed to indirectly beneficially own the shares of common stock of the Issuer held directly by CAZ Offshore because HLDR has voting and investment power over such securities.</footnote>
        <footnote id="F3">Securities of the Issuer held directly by HLDR Fund I NUS LP (&quot;HLDR NUS&quot;).  HLDR, through investment management and/or other governance agreements, may be deemed to indirectly beneficially own the securities of the Issuer held directly by HLDR NUS because HLDR has voting and investment power over such securities.</footnote>
        <footnote id="F4">Securities of the Issuer held directly by HLDR Fund I TE LP (&quot;HLDR TE&quot;).  HLDR, through investment management and/or other governance agreements, may be deemed to indirectly beneficially own the securities of the Issuer held directly by HLDR TE because HLDR has voting and investment power over such securities.</footnote>
        <footnote id="F5">Securities of the Issuer held directly by HLDR Fund I UST LP (&quot;HLDR UST&quot;).  HLDR, through investment management and/or other governance agreements, may be deemed to indirectly beneficially own the securities of the Issuer held directly by HLDR UST because HLDR has voting and investment power over such securities.</footnote>
        <footnote id="F6">Securities of the Issuer held directly by Praetor Fund 1 (&quot;Praetor&quot;), a sub-fund of Praetorium Fund I ICAV.  HLDR, through investment management and/or other governance agreements, may be deemed to indirectly beneficially own the securities of the Issuer held directly by Praetor because HLDR has voting and investment power over such securities.</footnote>
        <footnote id="F7">Securities of the Issuer held directly by Soryn HLDR Vehicle II LLC (&quot;Soryn&quot;, and together with CAZ Halcyon, CAZ Offshore, HLDR NUS, HLDR TE, HLDR UST, and Praetor, the &quot;Accounts&quot;).  HLDR, through investment management and/or other governance agreements, may be deemed to indirectly beneficially own the securities of the Issuer held directly by Soryn because HLDR has voting and investment power over such securities.  The warrant to purchase shares of common stock of the Issuer held directly by Soryn is subject to certain anti-dilution adjustments described in the warrant.</footnote>
        <footnote id="F8">HLDR Management GP LLC (&quot;HLDR Management&quot;) is the general partner of HLDR.  Halcyon Management Holdings GP LLC (&quot;Halcyon Management&quot;) is the sole member of HLDR Management.  Halcyon Management Partners LP (&quot;Halcyon Partners&quot;) is the sole member of Halcyon Management.  Halcyon Management Partners GP LLC (&quot;Halcyon Partners GP&quot;) is the general partner of Halcyon Partners.    John Bader is the Chief Executive Officer of HLDR, HLDR Management, Halcyon Management, Halcyon Partners and Halcyon Partners GP.   Jason Dillow is the Chief Investment Officer of HLDR.  By virtue of their relationship with HLDR, each of HLDR Management, Halcyon Management, Halcyon Partners, Halcyon Partners GP, Mr. Bader and Mr. Dillow may be deemed to exercise voting and investment power over the securities of the Issuer directly held by the Accounts.</footnote>
        <footnote id="F9">Each of HLDR, HLDR Management, Halcyon Management, Halcyon Partners, Halcyon Partners GP, Mr. Bader and Mr. Dillow disclaims beneficial ownership of securities of the Issuer held directly by the Accounts  except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of HLDR, HLDR Management, Halcyon Management, Halcyon Partners, Halcyon Partners GP, Mr. Bader or Mr. Dillow is the beneficial owner of such securities for purposes of Section 16 or any other purpose.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>HALCYON LONG DURATION RECOVERIES MANAGEMENT LP, by /s/ Suzanne McDermott, Chief Legal Officer, Chief Compliance Officer, Managing Principal</signatureName>
        <signatureDate>2018-03-19</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>HLDR MANAGEMENT GP LLC, by /s/ Suzanne McDermott, Chief Legal Officer, Chief Compliance Officer, Managing Principal</signatureName>
        <signatureDate>2018-03-19</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>HALCYON MANAGEMENT HOLDINGS GP LLC, by /s/ Suzanne McDermott, Chief Legal Officer, Chief Compliance Officer, Manging Principal</signatureName>
        <signatureDate>2018-03-19</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>HALCYON MANAGEMENT PARTNERS LP, /s/ Suzanne McDermott, Chief Legal Officer, Chief Compliance Officer, Managing Principal</signatureName>
        <signatureDate>2018-03-19</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>HALCYON MANAGEMENT PARTNERS GP LLC by /s/ Suzanne McDermott, Chief Legal Officer, Chief Compliance Officer, Managing Principal</signatureName>
        <signatureDate>2018-03-19</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ John Bader</signatureName>
        <signatureDate>2018-03-19</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Jason Dillow</signatureName>
        <signatureDate>2018-03-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
