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        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001120741</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001561550</issuerCik>
            <issuerName>DATADOG INC CL A</issuerName>
            <secFileNumber>001-39051</secFileNumber>
            <issuerAddress>
                <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                <ns2:city>NEW YORK </ns2:city>
                <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                <ns2:zipCode>10018</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>8663294466</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>DAVID OBSTLER</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</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>15000</noOfUnitsSold>
            <aggregateMarketValue>1887300.00</aggregateMarketValue>
            <noOfUnitsOutstanding>305929910</noOfUnitsOutstanding>
            <approxSaleDate>04/11/2024</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>04/11/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Exercise of Stock Options</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>15000</amountOfSecuritiesAcquired>
            <paymentDate>04/11/2024</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for David Obstler</name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <saleDate>03/21/2024</saleDate>
            <amountOfSecuritiesSold>3732</amountOfSecuritiesSold>
            <grossProceeds>467852.10</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for DAVID OBSTLER CHILDREN 2019 TRUST </name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <saleDate>03/21/2024</saleDate>
            <amountOfSecuritiesSold>3833</amountOfSecuritiesSold>
            <grossProceeds>480524.05</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for David Obstler</name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <saleDate>03/13/2024</saleDate>
            <amountOfSecuritiesSold>11268</amountOfSecuritiesSold>
            <grossProceeds>1411685.46</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for DAVID OBSTLER CHILDREN 2019 TRUST </name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <saleDate>03/13/2024</saleDate>
            <amountOfSecuritiesSold>11167</amountOfSecuritiesSold>
            <grossProceeds>1399036.38</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for David Obstler</name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <saleDate>03/11/2024</saleDate>
            <amountOfSecuritiesSold>70000</amountOfSecuritiesSold>
            <grossProceeds>8451044.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for DAVID OBSTLER CHILDREN 2019 TRUST </name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <saleDate>03/11/2024</saleDate>
            <amountOfSecuritiesSold>70000</amountOfSecuritiesSold>
            <grossProceeds>8450619.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>DAVID OBSTLER</name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>03/04/2024</saleDate>
            <amountOfSecuritiesSold>31007</amountOfSecuritiesSold>
            <grossProceeds>3986793.24</grossProceeds>
        </securitiesSoldInPast3Months>
        <remarks>Securities to be sold were registered on Form S-8.</remarks>
        <noticeSignature>
            <noticeDate>04/11/2024</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>12/10/2023</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ David Obstler</signature>
        </noticeSignature>
    </formData>
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144
0001120741
XXXXXXXX
LIVE
0001561550
DATADOG INC CL A
001-39051
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
8663294466
DAVID OBSTLER
Officer
COMMON
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
15000
1887300.00
305929910
04/11/2024
NASDAQ
Common
04/11/2024
Exercise of Stock Options
Issuer
N
15000
04/11/2024
Cash
N
10b5-1 Sales for David Obstler
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
COMMON
03/21/2024
3732
467852.10
10b5-1 Sales for DAVID OBSTLER CHILDREN 2019 TRUST
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
COMMON
03/21/2024
3833
480524.05
10b5-1 Sales for David Obstler
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
COMMON
03/13/2024
11268
1411685.46
10b5-1 Sales for DAVID OBSTLER CHILDREN 2019 TRUST
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
COMMON
03/13/2024
11167
1399036.38
10b5-1 Sales for David Obstler
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
COMMON
03/11/2024
70000
8451044.00
10b5-1 Sales for DAVID OBSTLER CHILDREN 2019 TRUST
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
COMMON
03/11/2024
70000
8450619.00
DAVID OBSTLER
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
Common
03/04/2024
31007
3986793.24
Securities to be sold were registered on Form S-8.
04/11/2024
12/10/2023
/s/ David Obstler