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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2015-07-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001373670</issuerCik>
        <issuerName>Green Brick Partners, Inc.</issuerName>
        <issuerTradingSymbol>GRBK</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001300345</rptOwnerCik>
            <rptOwnerName>Loeb Daniel S</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>390 PARK AVENUE</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>0001040273</rptOwnerCik>
            <rptOwnerName>Third Point LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>390 PARK AVENUE</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>0001453151</rptOwnerCik>
            <rptOwnerName>Third Point Offshore Master Fund, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THIRD POINT LLC</rptOwnerStreet1>
            <rptOwnerStreet2>390 PARK AVENUE</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>0001546187</rptOwnerCik>
            <rptOwnerName>Third Point Ultra Master Fund L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THIRD POINT LLC</rptOwnerStreet1>
            <rptOwnerStreet2>390 PARK AVENUE</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>0001623625</rptOwnerCik>
            <rptOwnerName>Third Point Reinsurance Co Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>THE WATERFRONT</rptOwnerStreet1>
            <rptOwnerStreet2>#96 PITTS BAY ROAD</rptOwnerStreet2>
            <rptOwnerCity>PEMBROKE, BERMUDA</rptOwnerCity>
            <rptOwnerState>D0</rptOwnerState>
            <rptOwnerZipCode>HM 08</rptOwnerZipCode>
            <rptOwnerStateDescription>BERMUDA</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001576018</rptOwnerCik>
            <rptOwnerName>Third Point Reinsurance Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>THE WATERFRONT</rptOwnerStreet1>
            <rptOwnerStreet2>#96 PITTS BAY ROAD</rptOwnerStreet2>
            <rptOwnerCity>PEMBROKE, BERMUDA</rptOwnerCity>
            <rptOwnerState>D0</rptOwnerState>
            <rptOwnerZipCode>HM 08</rptOwnerZipCode>
            <rptOwnerStateDescription>BERMUDA</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001646552</rptOwnerCik>
            <rptOwnerName>Third Point Reinsurance (USA) Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>51 JFK PARKWAY</rptOwnerStreet1>
            <rptOwnerStreet2>FIRST FLOOR WEST</rptOwnerStreet2>
            <rptOwnerCity>SHORT HILLS</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07078</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, par value $0.01 per share (&quot;Common Stock&quot;)</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>99943</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2015-07-01</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F3"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2840898</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>10</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>8083022</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The securities disclosed in this Form 4 are owned by (i) certain funds (the &quot;Funds&quot;) managed by Third Point LLC (&quot;Third Point&quot;) and by (ii) Third Point Reinsurance Company Ltd. (&quot;Third Point Re&quot;) and Third Point Reinsurance (USA) Ltd. (&quot;Third Point Re US&quot;), with respect to which Third Point LLC is the investment manager.  Daniel S. Loeb is the Chief Executive Officer of Third Point.  By reason of the provisions of Rule 16a-1 under the Securities Exchange Act of 1934, as amended (the &quot;Act&quot;), Third Point and Mr. Loeb may be deemed to be the beneficial owners of the securities beneficially owned by the Funds and by Third Point Re and Third Point Re US.  Third Point and Mr. Loeb hereby disclaim beneficial ownership of all such securities, except to the extent of any indirect pecuniary interest therein.</footnote>
        <footnote id="F2">Third Point and Mr. Loeb each disclaims beneficial ownership of these securities except to the extent of any indirect pecuniary interest therein, and this report shall not be deemed to be an admission that Third Point or Mr. Loeb is the beneficial owner of these securities for purposes of Section 16 of the Act, and the rules promulgated thereunder or for any other purpose. Each of Third Point Partners L.P. (which directly owns 2,690,647 shares of Common Stock), Third Point Partners Qualified L.P. (which directly owns 1,705,143 shares of Common Stock), Third Point Offshore Master Fund L.P., Third Point Ultra Master Fund L.P., Third Point Re and Third Point Re US hereby disclaims beneficial ownership of any securities reported herein other than those which it directly holds, for purposes of Section 16 of the Act and the rules promulgated thereunder or for any other purpose.</footnote>
        <footnote id="F3">On July 1, 2015, Green Brick Partners, Inc. (f/k/a BioFuel Energy Corp.) (the &quot;Issuer&quot;) consummated a registered public offering (the &quot;2015 Public Offering&quot;) of its Common Stock pursuant to a Registration Statement on Form S-3, which was declared effective by the U.S. Securities and Exchange Commission on June 22, 2015.  The Funds, Third Point Re and Third Point Re US purchased in the 2015 Public Offering an aggregate of 2,840,898 shares of Common Stock, as detailed in Exhibit 99.1 of this Form 4.</footnote>
    </footnotes>

    <remarks>List of Exhibits:
Exhibit 99.1 - Joint Filer Information
Exhibit 24.0 - Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>/s/ William Song, as attorney-in-fact for Daniel S. Loeb</signatureName>
        <signatureDate>2015-07-01</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Third Point LLC, By:  Daniel S. Loeb, Chief Executive Officer, By:  /s/ William Song, Attorney-in-Fact</signatureName>
        <signatureDate>2015-07-01</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Third Point Partners L.P., By:  Third Point Advisors LLC, its General Partner, By:  Daniel S. Loeb, Managing Member; By:  /s/ William Song, Attorney-in-Fact</signatureName>
        <signatureDate>2015-07-01</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Third Point Partners Qualified L.P., By:  Third Point Advisors LLC, its General Partner, By:  Daniel S. Loeb, Managing Member, By:  /s/ William Song, Attorney-in-Fact</signatureName>
        <signatureDate>2015-07-01</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Third Point Offshore Master Fund L.P., By:  Third Point Advisors II LLC, its General Partner, By:  Daniel S. Loeb, Managing Member, By:  /s/ William Song, Attorney-in-Fact</signatureName>
        <signatureDate>2015-07-01</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Third Point Ultra Master Fund L.P., By:  Third Point Advisors II LLC, its General Partner, By:  Daniel S. Loeb, Managing Member, By:  /s/ William Song, Attorney-in-Fact</signatureName>
        <signatureDate>2015-07-01</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Third Point Reinsurance Company Ltd., By:  /s/ William Song, Attorney-in-Fact</signatureName>
        <signatureDate>2015-07-01</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Third Point Reinsurance Ltd., By:  /s/ William Song, Attorney-in-Fact</signatureName>
        <signatureDate>2015-07-01</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Third Point Reinsurance (USA) Ltd., By: William Song, Attorney-in-Fact</signatureName>
        <signatureDate>2015-07-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
