<SEC-DOCUMENT>0000899243-19-007288.txt : 20190312
<SEC-HEADER>0000899243-19-007288.hdr.sgml : 20190312
<ACCEPTANCE-DATETIME>20190312173124
ACCESSION NUMBER:		0000899243-19-007288
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20190308
FILED AS OF DATE:		20190312
DATE AS OF CHANGE:		20190312

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			GORDON JAMES R
		CENTRAL INDEX KEY:			0001291478

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37875
		FILM NUMBER:		19676104

	MAIL ADDRESS:	
		STREET 1:		104 SOUTH MAIN STREET
		CITY:			GREENVILLE
		STATE:			SC
		ZIP:			29601

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FB Financial Corp
		CENTRAL INDEX KEY:			0001649749
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				621216058
		STATE OF INCORPORATION:			TN
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		211 COMMERCE STREET
		STREET 2:		SUITE 300
		CITY:			NASHVILLE
		STATE:			TN
		ZIP:			37201
		BUSINESS PHONE:		615-313-0080

	MAIL ADDRESS:	
		STREET 1:		211 COMMERCE STREET
		STREET 2:		SUITE 300
		CITY:			NASHVILLE
		STATE:			TN
		ZIP:			37201

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	First South Bancorp, Inc.
		DATE OF NAME CHANGE:	20150731
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-03-08</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001649749</issuerCik>
        <issuerName>FB Financial Corp</issuerName>
        <issuerTradingSymbol>FBK</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001291478</rptOwnerCik>
            <rptOwnerName>GORDON JAMES R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>211 COMMERCE STREET</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 300</rptOwnerStreet2>
            <rptOwnerCity>NASHVILLE</rptOwnerCity>
            <rptOwnerState>TN</rptOwnerState>
            <rptOwnerZipCode>37201</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CFO and Secretary</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2019-03-08</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5069</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>21890</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Reflects restricted stock units (RSUs) granted pursuant to the issuer's 2016 Incentive Plan for the reporting person's performance during 2018, which RSUs vest in three approximately equal installments on each of the first three anniversaries of the grant date, subject to the reporting person's continued employment with the issuer on each such date.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Beth W. Sims, as Attorney-in-Fact</signatureName>
        <signatureDate>2019-03-12</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
