<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:ns2="http://www.sec.gov/edgar/common">
    <headerData>
        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001346629</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0000798354</issuerCik>
            <issuerName>FISERV, INC.</issuerName>
            <secFileNumber>001-38962</secFileNumber>
            <issuerAddress>
                <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                <ns2:city>Milwaukee</ns2:city>
                <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                <ns2:zipCode>53203</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>262- 879-5000</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>FRANK J BISIGNANO</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Former Affiliate</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>420524</noOfUnitsSold>
            <aggregateMarketValue>72082018.84</aggregateMarketValue>
            <noOfUnitsOutstanding>554433824</noOfUnitsOutstanding>
            <approxSaleDate>06/26/2025</approxSaleDate>
            <securitiesExchangeName>NYSE</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>06/24/2025</acquiredDate>
            <natureOfAcquisitionTransaction>Exercise of options under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>53630</amountOfSecuritiesAcquired>
            <paymentDate>06/24/2025</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>07/31/2022</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>56866</amountOfSecuritiesAcquired>
            <paymentDate>07/31/2022</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>06/24/2025</acquiredDate>
            <natureOfAcquisitionTransaction>Exercise of options under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>297646</amountOfSecuritiesAcquired>
            <paymentDate>06/24/2025</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>08/15/2022</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>12382</amountOfSecuritiesAcquired>
            <paymentDate>08/15/2022</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/24/2025</saleDate>
            <amountOfSecuritiesSold>213906</amountOfSecuritiesSold>
            <grossProceeds>37161899.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/23/2025</saleDate>
            <amountOfSecuritiesSold>250000</amountOfSecuritiesSold>
            <grossProceeds>42165769.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/20/2025</saleDate>
            <amountOfSecuritiesSold>1965</amountOfSecuritiesSold>
            <grossProceeds>322260.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/17/2025</saleDate>
            <amountOfSecuritiesSold>50000</amountOfSecuritiesSold>
            <grossProceeds>8251579.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/16/2025</saleDate>
            <amountOfSecuritiesSold>50000</amountOfSecuritiesSold>
            <grossProceeds>8253429.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/10/2025</saleDate>
            <amountOfSecuritiesSold>1665</amountOfSecuritiesSold>
            <grossProceeds>282230.82</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/09/2025</saleDate>
            <amountOfSecuritiesSold>200000</amountOfSecuritiesSold>
            <grossProceeds>33757904.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/06/2025</saleDate>
            <amountOfSecuritiesSold>200000</amountOfSecuritiesSold>
            <grossProceeds>33324424.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/06/2025</saleDate>
            <amountOfSecuritiesSold>2500</amountOfSecuritiesSold>
            <grossProceeds>974291.88</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>Frank Bisignano</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/05/2025</saleDate>
            <amountOfSecuritiesSold>100000</amountOfSecuritiesSold>
            <grossProceeds>16504904.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>Frank Bisignano</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/04/2025</saleDate>
            <amountOfSecuritiesSold>100000</amountOfSecuritiesSold>
            <grossProceeds>16399994.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>MORGAN BISIGNANO 2020 TRUST</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/04/2025</saleDate>
            <amountOfSecuritiesSold>11140</amountOfSecuritiesSold>
            <grossProceeds>1810320.37</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>HENRY BISIGNANO 2020 TRUST</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/04/2025</saleDate>
            <amountOfSecuritiesSold>19840</amountOfSecuritiesSold>
            <grossProceeds>3223995.48</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>THE ALEXA BISIGNANO 2020 TRUST</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/04/2025</saleDate>
            <amountOfSecuritiesSold>19840</amountOfSecuritiesSold>
            <grossProceeds>3223993.50</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO 2020</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/04/2025</saleDate>
            <amountOfSecuritiesSold>86700</amountOfSecuritiesSold>
            <grossProceeds>14088760.84</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>Frank Bisignano</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/30/2025</saleDate>
            <amountOfSecuritiesSold>200000</amountOfSecuritiesSold>
            <grossProceeds>32149354.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>Frank Bisignano</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/29/2025</saleDate>
            <amountOfSecuritiesSold>100000</amountOfSecuritiesSold>
            <grossProceeds>15920284.81</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/27/2025</saleDate>
            <amountOfSecuritiesSold>1549</amountOfSecuritiesSold>
            <grossProceeds>249088.19</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/27/2025</saleDate>
            <amountOfSecuritiesSold>1122</amountOfSecuritiesSold>
            <grossProceeds>180545.74</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/27/2025</saleDate>
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            <grossProceeds>59034.63</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/27/2025</saleDate>
            <amountOfSecuritiesSold>204</amountOfSecuritiesSold>
            <grossProceeds>32801.17</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/27/2025</saleDate>
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        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>TRACY S BISIGNANO</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/27/2025</saleDate>
            <amountOfSecuritiesSold>1281</amountOfSecuritiesSold>
            <grossProceeds>206132.02</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>TRACY S BISIGNANO</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/27/2025</saleDate>
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            <grossProceeds>206057.47</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>Frank Bisignano</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/20/2025</saleDate>
            <amountOfSecuritiesSold>100000</amountOfSecuritiesSold>
            <grossProceeds>16690763.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO 2015 GRAT</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/19/2025</saleDate>
            <amountOfSecuritiesSold>30561</amountOfSecuritiesSold>
            <grossProceeds>5153711.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO 2015 GRAT</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/19/2025</saleDate>
            <amountOfSecuritiesSold>30561</amountOfSecuritiesSold>
            <grossProceeds>5153690.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO 2015 GRAT</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/19/2025</saleDate>
            <amountOfSecuritiesSold>30561</amountOfSecuritiesSold>
            <grossProceeds>5153718.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>Frank Bisignano</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/19/2025</saleDate>
            <amountOfSecuritiesSold>100000</amountOfSecuritiesSold>
            <grossProceeds>33550556.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FRANK J BISIGNANO</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Covered Call</securitiesClassTitle>
            <saleDate>05/19/2025</saleDate>
            <amountOfSecuritiesSold>5845</amountOfSecuritiesSold>
            <grossProceeds>1964434.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>Frank Bisignano</name>
                <address>
                    <ns2:street1>600 N. Vel R. Phillips Avenue</ns2:street1>
                    <ns2:city>Milwaukee</ns2:city>
                    <ns2:stateOrCountry>WI</ns2:stateOrCountry>
                    <ns2:zipCode>53203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/16/2025</saleDate>
            <amountOfSecuritiesSold>100000</amountOfSecuritiesSold>
            <grossProceeds>16683943.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>06/26/2025</noticeDate>
            <planAdoptionDates/>
            <signature>/s/ Frank J Bisignano</signature>
        </noticeSignature>
    </formData>
</edgarSubmission>
[{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 27082}]
144
0001346629
XXXXXXXX
LIVE
0000798354
FISERV, INC.
001-38962
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
262- 879-5000
FRANK J BISIGNANO
Former Affiliate
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
420524
72082018.84
554433824
06/26/2025
NYSE
Common
06/24/2025
Exercise of options under a registered plan
Issuer
N
53630
06/24/2025
Cash
Common
07/31/2022
Restricted stock vesting under a registered plan
Issuer
N
56866
07/31/2022
Cash
Common
06/24/2025
Exercise of options under a registered plan
Issuer
N
297646
06/24/2025
Cash
Common
08/15/2022
Restricted stock vesting under a registered plan
Issuer
N
12382
08/15/2022
Cash
N
FRANK J BISIGNANO
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
06/24/2025
213906
37161899.00
FRANK J BISIGNANO
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
06/23/2025
250000
42165769.00
FRANK J BISIGNANO
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
06/20/2025
1965
322260.00
FRANK J BISIGNANO
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
06/17/2025
50000
8251579.00
FRANK J BISIGNANO
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
06/16/2025
50000
8253429.00
FRANK J BISIGNANO
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
06/10/2025
1665
282230.82
FRANK J BISIGNANO
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
06/09/2025
200000
33757904.00
FRANK J BISIGNANO
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
06/06/2025
200000
33324424.00
FRANK J BISIGNANO
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
06/06/2025
2500
974291.88
Frank Bisignano
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
06/05/2025
100000
16504904.00
Frank Bisignano
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
06/04/2025
100000
16399994.00
MORGAN BISIGNANO 2020 TRUST
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
06/04/2025
11140
1810320.37
HENRY BISIGNANO 2020 TRUST
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
06/04/2025
19840
3223995.48
THE ALEXA BISIGNANO 2020 TRUST
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
06/04/2025
19840
3223993.50
FRANK J BISIGNANO 2020
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
06/04/2025
86700
14088760.84
Frank Bisignano
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
05/30/2025
200000
32149354.00
Frank Bisignano
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
05/29/2025
100000
15920284.81
FRANK J BISIGNANO
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
05/27/2025
1549
249088.19
FRANK J BISIGNANO
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
05/27/2025
1122
180545.74
FRANK J BISIGNANO
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
05/27/2025
367
59034.63
FRANK J BISIGNANO
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
05/27/2025
204
32801.17
FRANK J BISIGNANO
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
05/27/2025
2556
404006.16
TRACY S BISIGNANO
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
05/27/2025
1281
206132.02
TRACY S BISIGNANO
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
05/27/2025
1281
206057.47
Frank Bisignano
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
05/20/2025
100000
16690763.00
FRANK J BISIGNANO 2015 GRAT
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
05/19/2025
30561
5153711.00
FRANK J BISIGNANO 2015 GRAT
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
05/19/2025
30561
5153690.00
FRANK J BISIGNANO 2015 GRAT
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
05/19/2025
30561
5153718.00
Frank Bisignano
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
05/19/2025
100000
33550556.00
FRANK J BISIGNANO
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Covered Call
05/19/2025
5845
1964434.00
Frank Bisignano
600 N. Vel R. Phillips Avenue
Milwaukee
WI
53203
Common
05/16/2025
100000
16683943.00
06/26/2025
/s/ Frank J Bisignano