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            <secFileNumber>000-19034</secFileNumber>
            <issuerAddress>
                <ns2:street1>777 Old Saw Mill River Road</ns2:street1>
                <ns2:city>Tarrytown</ns2:city>
                <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                <ns2:zipCode>10591-6707</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>(914) 847-7000</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>MARION E MCCOURT</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
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        <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>1000</noOfUnitsSold>
            <aggregateMarketValue>1178730.00</aggregateMarketValue>
            <noOfUnitsOutstanding>110234529</noOfUnitsOutstanding>
            <approxSaleDate>09/03/2024</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>09/03/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Stock Option Exercise</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1000</amountOfSecuritiesAcquired>
            <paymentDate>09/03/2024</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
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                <name>MARION E MCCOURT</name>
                <address>
                    <ns2:street1>777 Old Saw Mill River Road</ns2:street1>
                    <ns2:city>Tarrytown</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10591-6707</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>08/01/2024</saleDate>
            <amountOfSecuritiesSold>1137</amountOfSecuritiesSold>
            <grossProceeds>1206197.82</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>MARION E MCCOURT</name>
                <address>
                    <ns2:street1>777 Old Saw Mill River Road</ns2:street1>
                    <ns2:city>Tarrytown</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10591-6707</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>07/01/2024</saleDate>
            <amountOfSecuritiesSold>1137</amountOfSecuritiesSold>
            <grossProceeds>1190564.07</grossProceeds>
        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>09/03/2024</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>02/13/2024</planAdoptionDate>
            </planAdoptionDates>
            <signature>MARION E MCCOURT</signature>
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144
0001663758
XXXXXXXX
LIVE
0000872589
REGENERON PHARMACEUTICALS, INC.
000-19034
777 Old Saw Mill River Road
Tarrytown
NY
10591-6707
(914) 847-7000
MARION E MCCOURT
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
1000
1178730.00
110234529
09/03/2024
NASDAQ
Common
09/03/2024
Stock Option Exercise
Issuer
N
1000
09/03/2024
Cash
N
MARION E MCCOURT
777 Old Saw Mill River Road
Tarrytown
NY
10591-6707
Common
08/01/2024
1137
1206197.82
MARION E MCCOURT
777 Old Saw Mill River Road
Tarrytown
NY
10591-6707
Common
07/01/2024
1137
1190564.07
09/03/2024
02/13/2024
MARION E MCCOURT