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

    <schemaVersion>X0609</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2026-08-12</periodOfReport>

    <dateOfOriginalSubmission>2026-08-12</dateOfOriginalSubmission>

    <issuer>
        <issuerCik>0001611115</issuerCik>
        <issuerName>Omada Health, Inc.</issuerName>
        <issuerTradingSymbol>OMDA</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002069137</rptOwnerCik>
            <rptOwnerName>Shao Wei-Li</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>C/O OMADA HEALTH, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>611 GATEWAY BLVD, SUITE 120</rptOwnerStreet2>
            <rptOwnerCity>SOUTH SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94080</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>true</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2026-08-12</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>9418</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>25.0167</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>307372</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Transaction made pursuant to a 10b5-1 trading plan adopted by the Reporting Person on March 13, 2026.</footnote>
        <footnote id="F2">This Form 4/A is being filed solely to correct the number of shares reported as sold pursuant to the Reporting Person's 10b5-1 plan on August 12, 2026. The amount of shares sold has been adjusted to reflect the addition of 552 shares that were inadvertently omitted from the original Form 4 filed with the U.S. Securities and Exchange Commission on August 12, 2026. Except as otherwise noted in this footnote, all other information disclosed in the Reporting Person's original Form 4 remains accurate.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Nathan Salha, as Attorney-in-Fact for Wei-Li Shao</signatureName>
        <signatureDate>2026-09-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
