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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2015-06-25</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001443799</issuerCik>
        <issuerName>Gener8 Maritime, Inc.</issuerName>
        <issuerTradingSymbol>GNRT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001403525</rptOwnerCik>
            <rptOwnerName>Oaktree Capital Group Holdings GP, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O OAKTREE CAPITAL MANAGEMENT, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>333 SOUTH GRAND AVENUE, 28TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>LOS ANGELES</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90071</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001403528</rptOwnerCik>
            <rptOwnerName>Oaktree Capital Group, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O OAKTREE CAPITAL MANAGEMENT, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>333 SOUTH GRAND AVENUE, 28TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>LOS ANGELES</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90071</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000949509</rptOwnerCik>
            <rptOwnerName>OAKTREE CAPITAL MANAGEMENT LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O OAKTREE CAPITAL MANAGEMENT, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>333 SOUTH GRAND AVENUE, 28TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>LOS ANGELES</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90071</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001403382</rptOwnerCik>
            <rptOwnerName>Oaktree Holdings, Inc.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O OAKTREE CAPITAL MANAGEMENT, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>333 SOUTH GRAND AVENUE, 28TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>LOS ANGELES</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90071</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2015-06-25</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>104985</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>13.12</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>11641861</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2015-06-25</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>98139</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>13.05</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>11740000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2015-06-26</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>183244</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>13.44</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>11923244</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">OCM Marine Holdings TP, L.P. (&quot;OCM Marine&quot;) directly owns the common stock (the &quot;Common Stock&quot;) of the Issuer. This Form 4 is also being filed by: (i) OCM Marine GP CTB, Ltd. (&quot;OCM Marine GP&quot;) in its capacity as the general partner of OCM Marine; (ii) Oaktree Capital Management, L.P. (&quot;OCM LP&quot;) in its capacity as the sole director of OCM Marine, (iii) Oaktree Holdings, Inc. (&quot;Holdings, Inc.&quot;) in its capacity as the general partner of OCM LP; (iv) Oaktree Capital Group, LLC (&quot;OCG&quot;) in its capacity as the sole shareholder of Holdings, Inc. and the managing member of Oaktree Holdings, LLC (&quot;Holdings LLC&quot;); (v) Oaktree Capital Group Holdings GP, LLC (&quot;OCGH GP&quot;) in its capacity as the duly appointed manager of OCG; (vi) Oaktree Principal Fund V, L.P. (&quot;PFV&quot;) in its capacity as the majority shareholder of OCM Marine GP;</footnote>
        <footnote id="F2">(vii) Oaktree Principal Fund V GP, L.P. (&quot;PFV GP&quot;) in its capacity as the general partner of PFV; (viii) Oaktree Principal Fund V GP Ltd. (&quot;PFV GP GP&quot;) in its capacity as the general partner of PFV GP; (ix) Oaktree Fund GP I, L.P. (&quot;GP I&quot;) in its capacity as the sole shareholder of PFV GP GP; (x) Oaktree Capital I, L.P. (&quot;Capital I&quot;) in its capacity as the general partner of GP I; (xi) OCM Holdings I, LLC (&quot;Holdings I&quot;) in its capacity as the general partner of Capital I; and (xii) Holdings LLC in its capacity as the managing member of Holdings I (each of OCM Marine GP, OCM LP, Holdings, Inc., OCG, OCGH GP, PFV, PFV GP, PFV GP GP, GP I, Capital I, Holdings I and Holdings LLC, a &quot;Reporting Person&quot; and collectively, &quot;Reporting Persons&quot;).</footnote>
        <footnote id="F3">Each Reporting Person disclaims beneficial ownership of all Common Stock reported herein except to the extent of its respective pecuniary interest therein, and the filing of this Form 4 shall not be construed as an admission that any such Reporting Person is the beneficial owner of any Common Stock covered by this Form 4.</footnote>
        <footnote id="F4">OCGH GP is managed by an executive committee consisting of Howard S. Marks, Bruce A. Karsh, Sheldon M. Stone, Larry W. Keele, Stephen A. Kaplan, John B. Frank, David Kirchheimer, and Jay S. Wintrob (the &quot;OCGH GP Members&quot;). In such capacity, the OCGH GP Members may be deemed to have indirect beneficial ownership of the Common Stock held directly by OCM Marine. Each OCGH GP Member expressly disclaims beneficial ownership of the Common Stock held directly by OCM Marine, except to the extent of his respective pecuniary interests therein, and the filing of this Form 4 shall not be construed as an admission that any such person is the beneficial owner of any Common Stock covered by this Form 4.</footnote>
    </footnotes>

    <remarks>This Form 4 is being filed in two parts due to the large number of reporting persons. This filing is being filed by Oaktree Capital Group Holdings GP, LLC, Oaktree Capital Group, LLC, Oaktree Capital Management, L.P. and Oaktree Holdings, Inc. An accompanying filings is being filed, on the date hereof, by OCM Marine Holdings TP, L.P., OCM Marine GP CTB, Ltd., Oaktree Principal Fund V, L.P., Oaktree Principal Fund V GP, L.P., Oaktree Principal Fund V GP Ltd., Oaktree Fund GP I, L.P., Oaktree Capital I, L.P., OCM Holdings I, LLC and Oaktree Holdings, LLC. All filings relate to the same holdings described above.</remarks>

    <ownerSignature>
        <signatureName>OAKTREE CAPITAL GROUP HOLDINGS GP, LLC By: Oaktree Capital Management, L.P. Its: Director By: /s/ Lisa Arakaki Name: Lisa Arakaki Title: Managing Director By: /s/ Jamie Toothman Name: Jamie Toothman Title: Vice President</signatureName>
        <signatureDate>2015-06-29</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>OAKTREE CAPITAL GROUP, LLC By: Oaktree Principal Fund V GP, L.P. Its: GP By: Oaktree Principal Fund V GP Ltd. Its: GP By: Oaktree Capital Management, L.P. Its: Dir. By: /s/ Lisa Arakaki, M. Dir. By: /s/ Jamie Toothman, VP</signatureName>
        <signatureDate>2015-06-29</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>OAKTREE CAPITAL MANAGEMENT, L.P. By: Oaktree Principal Fund V GP Ltd. Its: GP By: Oaktree Capital Management, L.P. Its: Dir. By: /s/ Lisa Arakaki Name: Lisa Arakaki Title: M. Dir. By: /s/ Jamie Toothman Name: Jamie Toothman Title: VP</signatureName>
        <signatureDate>2015-06-29</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>OAKTREE HOLDINGS, INC. By: Oaktree Capital Management, L.P. Its: Director By: /s/ Lisa Arakaki Name: Lisa Arakaki Title: Managing Director By: /s/ Jamie Toothman Name: Jamie Toothman Title: Vice President</signatureName>
        <signatureDate>2015-06-29</signatureDate>
    </ownerSignature>
</ownershipDocument>
