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

    <schemaVersion>X0508</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2023-03-31</periodOfReport>

    <dateOfOriginalSubmission>2023-05-01</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001753162</issuerCik>
        <issuerName>Fathom Holdings Inc.</issuerName>
        <issuerTradingSymbol>FTHM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001817237</rptOwnerCik>
            <rptOwnerName>Harley Joshua</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O FATHOM HOLDINGS INC.</rptOwnerStreet1>
            <rptOwnerStreet2>2000 REGENCY PARKWAY DRIVE, SUITE 300</rptOwnerStreet2>
            <rptOwnerCity>CARY</rptOwnerCity>
            <rptOwnerState>NC</rptOwnerState>
            <rptOwnerZipCode>27518</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Executive Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2023-03-31</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>58824</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3157711</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Of these shares, 9,558 shares are restricted and vest in full on March 4, 2024, 4,426 shares are restricted and vest in full on July 1, 2024, 18,466 shares are restricted and vest in full on November 30, 2024, 29,616 shares are restricted and vest in full on March 31, 2024, 31,888 shares are restricted and vest in full on December 1, 2023, 47,170 shares are restricted and vest in full on December 1, 2023, 58,140 shares are restricted and vest in full on May 31, 2024, and 58,824 shares are restricted and vest in full on August 30, 2024.</footnote>
    </footnotes>

    <remarks>This amendment is filed to correct the amount of shares held by the Reporting Person after the transaction on March 31, 2023. The amount of shares owned reflects (i) the amended amount of shares awarded on December 1, 2021 (from the originally reported 18,443 shares to the correct amount of 18,466 shares), and (ii) the amended amount of shares sold on August 12, 2021 (from the originally reported amount of 13,516 shares to the correct amount of 2,020 shares), both of which have been reflected in amended Forms 4 filed on August 30, 2023.  All other information in the original Form 4 remains unchanged.</remarks>

    <ownerSignature>
        <signatureName>/s/ Donald R. Reynolds, by Power of Attorney</signatureName>
        <signatureDate>2023-08-30</signatureDate>
    </ownerSignature>
</ownershipDocument>
