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

    <schemaVersion>X0609</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2026-04-20</periodOfReport>

    <dateOfOriginalSubmission>2026-04-22</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001434316</issuerCik>
        <issuerName>FATE THERAPEUTICS INC</issuerName>
        <issuerTradingSymbol>FATE</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001425738</rptOwnerCik>
            <rptOwnerName>Redmile Group, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>900 LARKSPUR LANDING CIRCLE,</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 270</rptOwnerStreet2>
            <rptOwnerCity>LARKSPUR</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94939</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001650527</rptOwnerCik>
            <rptOwnerName>Green Jeremy</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>C/O REDMILE GROUP, LLC (NY OFFICE)</rptOwnerStreet1>
            <rptOwnerStreet2>45 W. 27TH STREET, FLOOR 11</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10001</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001921783</rptOwnerCik>
            <rptOwnerName>RedCo II Master Fund, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>C/O REDMILE GROUP, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>900 LARKSPUR LANDING CIRCLE, SUITE 270</rptOwnerStreet2>
            <rptOwnerCity>LARKSPUR</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94939</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Cash-settled Swaps</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>5.84</value>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2026-04-20</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F7"/>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>266280</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F7"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F6"/>
                <footnoteId id="F8"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F9"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>266280</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F5"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Cash-settled Swaps</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>5.84</value>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2026-04-20</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F3"/>
                <footnoteId id="F7"/>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>266280</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F7"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F6"/>
                <footnoteId id="F8"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F9"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>266280</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>502769</value>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents the reference price associated with the swap agreements. On April 22, 2026, the Reporting Persons filed a Form 4 that inadvertently misstated the reference price associated with the swap agreements novated by RedCo II Master Fund, L.P. (&quot;RedCo II&quot;) to its two wholly-owned subsidiaries (collectively, the &quot;SPVs&quot;) in the internal reorganization reported on the prior Form 4. This amendment is being filed solely to correct this administrative error and include the correct reference price.</footnote>
        <footnote id="F2">The reported securities were directly owned by RedCo II, a private investment vehicle managed by Redmile Group, LLC (&quot;Redmile&quot;).</footnote>
        <footnote id="F3">This transaction is reported to reflect that two of the Reporting Persons (Redmile and Jeremy Green, its principal) retain an indirect beneficial ownership in the securities transacted in, as reported in the row above. The internal reorganization resulted in no change in the aggregate beneficial ownership of Redmile or Mr. Green.</footnote>
        <footnote id="F4">The reported securities are directly owned by certain private investment vehicles managed by Redmile (collectively, the &quot;Redmile Clients&quot;), excluding RedCo II but including the SPVs.</footnote>
        <footnote id="F5">Redmile may be deemed to beneficially own the reported securities as the investment manager of RedCo II, each of the SPVs, and each of the other Redmile Clients. The reported securities may also be deemed beneficially owned by Jeremy Green as the principal of Redmile. Redmile and Mr. Green disclaim beneficial ownership of the reported securities except to the extent of its and his respective pecuniary interest therein, if any. This report shall not be deemed an admission that Redmile or Mr. Green is the beneficial owner of the securities for purposes of Section 16 of the Exchange Act, or for any other purpose.</footnote>
        <footnote id="F6">Certain Redmile Clients are parties to swap agreements with counterparties. Each notional share subject to each swap agreement represents the economic equivalent of one share of Common Stock. These agreements do not give the Reporting Persons direct or indirect voting, investment or dispositive control over any securities of the Issuer and do not require the counterparties thereto to acquire, hold, vote or dispose of any securities of the Issuer.</footnote>
        <footnote id="F7">In connection with the reorganization of RedCo II, the swap agreements to which RedCo II was a counterparty were novated to the SPVs on a pro-rata basis, for no consideration, with no change to any other terms of the swap agreement and no change in the economic exposure.</footnote>
        <footnote id="F8">The Reporting Persons disclaim any beneficial ownership in securities that may be referenced in such swap agreements or that may be held from time to time by any counterparties to the agreements.</footnote>
        <footnote id="F9">The Redmile Clients that are parties to the swap agreements have the right to close out each swap at any time. Upon settlement of the various swap agreements, either (i) the counterparty will pay to the Redmile Clients in cash an amount determined in part by reference to any increase between the reference price and the market value of the notional number of shares of Common Stock subject to the swap agreement or (ii) the Redmile Clients will pay to the counterparty in cash an amount determined in part by reference to any decrease between the reference price and the market value of the notional number of shares of Common Stock subject to the swap agreement.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>By: /s/ Jeremy Green, Managing Member of Redmile Group, LLC</signatureName>
        <signatureDate>2026-04-23</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Jeremy Green, Managing Member of RedCo II (GP), LLC, the General Partner of RedCo II Master Fund, L.P.</signatureName>
        <signatureDate>2026-04-23</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Jeremy Green</signatureName>
        <signatureDate>2026-04-23</signatureDate>
    </ownerSignature>
</ownershipDocument>