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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-05-13</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001592386</issuerCik>
        <issuerName>Virtu Financial, Inc.</issuerName>
        <issuerTradingSymbol>VIRT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001021944</rptOwnerCik>
            <rptOwnerName>Temasek Holdings (Private) Ltd</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>60B ORCHARD ROAD #06-18 TOWER 2</rptOwnerStreet1>
            <rptOwnerStreet2>THE ATRIUM@ORCHARD</rptOwnerStreet2>
            <rptOwnerCity>SINGAPORE</rptOwnerCity>
            <rptOwnerState>U0</rptOwnerState>
            <rptOwnerZipCode>238891</rptOwnerZipCode>
            <rptOwnerStateDescription>SINGAPORE</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A common stock, par value $0.00001 per share</value>
            </securityTitle>
            <transactionDate>
                <value>2020-05-13</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5500000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>23.10</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>11380503</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See note</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Havelock Fund Investments Pte Ltd (&quot;Havelock&quot;) directly owns 8,867,682 Class A common stock, par value $0.00001 per share (&quot;Class A Shares&quot;). Havelock is wholly owned by Fullerton Fund Investments Pte. Ltd. (&quot;Fullerton&quot;). Fullerton may be deemed to beneficially own the Class A Shares beneficially owned by Havelock. Aranda Investments Pte. Ltd. (&quot;Aranda&quot;) directly owns 2,512,821 Class A Shares. Aranda is wholly owned by Seletar Investments Pte. Ltd. (&quot;Seletar&quot;), which is wholly owned by Temasek Capital (Private) Limited (&quot;Temasek Capital&quot;). Each of Seletar and Temasek Capital may be deemed to beneficially own the Class A Shares beneficially owned by Aranda. Each of Temasek Capital and Fullerton are wholly owned by Temasek Holdings (Private) Limited (&quot;Temasek&quot;). Therefore, Temasek may be deemed to beneficially own the 11,380,503 Class A Shares deemed to be beneficially owned in the aggregate by Temasek Capital and Fullerton.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>TEMASEK HOLDINGS (PRIVATE) LIMITED
By:  /s/  Andrew Ang Lye Whatt, in his capacity as Authorized Signatory</signatureName>
        <signatureDate>2020-05-15</signatureDate>
    </ownerSignature>
</ownershipDocument>
