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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-05-17</periodOfReport>

    <issuer>
        <issuerCik>0001612720</issuerCik>
        <issuerName>NextDecade Corp.</issuerName>
        <issuerTradingSymbol>NEXT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001633312</rptOwnerCik>
            <rptOwnerName>Bardin Hill Investment 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>true</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001713578</rptOwnerCik>
            <rptOwnerName>Dillow Jason</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BARDIN HILL INVESTMENT PARTNERS LP</rptOwnerStreet1>
            <rptOwnerStreet2>477 MADISON AVE., 8TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001745466</rptOwnerCik>
            <rptOwnerName>Greene John Winand JR</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BARDIN HILL INVESTMENT PARTNERS LP</rptOwnerStreet1>
            <rptOwnerStreet2>477 MADISON AVENUE, 8TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOther>true</isOther>
            <otherText>Director by Deputization</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Series B Convertible Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>7.5</value>
                <footnoteId id="F6"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2019-05-17</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>3366</value>
                    <footnoteId id="F4"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1000</value>
                    <footnoteId id="F4"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock, $ 0.0001 par value</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>448800</value>
                    <footnoteId id="F6"/>
                    <footnoteId id="F7"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3366</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Series B Warrants</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.01</value>
                <footnoteId id="F10"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2019-05-17</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>60332</value>
                    <footnoteId id="F9"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F12"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F10"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F10"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock, $ 0.0001 par value</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>60332</value>
                    <footnoteId id="F8"/>
                    <footnoteId id="F11"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>60332</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">See Exhibit 99.1 for text of footnote (1).</footnote>
        <footnote id="F2">See Exhibit 99.1 for text of footnote (2).</footnote>
        <footnote id="F3">See Exhibit 99.1 for text of footnote (3).</footnote>
        <footnote id="F4">See Exhibit 99.1 for text of footnote (4).</footnote>
        <footnote id="F5">See Exhibit 99.1 for text of footnote (5).</footnote>
        <footnote id="F6">See Exhibit 99.1 for text of footnote (6).</footnote>
        <footnote id="F7">See Exhibit 99.1 for text of footnote (7).</footnote>
        <footnote id="F8">See Exhibit 99.1 for text of footnote (8).</footnote>
        <footnote id="F9">See Exhibit 99.1 for text of footnote (9).</footnote>
        <footnote id="F10">See Exhibit 99.1 for text of footnote (10).</footnote>
        <footnote id="F11">See Exhibit 99.1 for text of footnote (11).</footnote>
        <footnote id="F12">See Exhibit 99.1 for text of footnote (12).</footnote>
    </footnotes>

    <remarks>Exhibit 99.1 (Footnotes) and Exhibit 99.2 (Joint Filer Information) are incorporated herein by reference. This Form 4 is the second of two Forms 4 being filed relating to the same event. The Form 4 has been split into two filings because there are more than ten Reporting Persons in total, and the SEC's EDGAR filing system limits a single Form 4 to a maximum of ten Reporting Persons. This Form 4 is filed by Designated Filer Bardin Hill Investment Partners LP.</remarks>

    <ownerSignature>
        <signatureName>Bardin Hill Investment Partners LP
By: /s/ Suzanne McDermott
Name: Suzanne McDermott
Title: Chief Compliance Officer</signatureName>
        <signatureDate>2019-05-21</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>By: /s/ John Freese
Name: John Freese
Title: Deputy General Counsel</signatureName>
        <signatureDate>2019-05-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
