<?xml version="1.0" encoding="UTF-8"?><ns2:edgarSubmission xmlns:com="http://www.sec.gov/edgar/common" xmlns:ns2="http://www.sec.gov/edgar/ownership">
    <ns2:headerData>
        <ns2:submissionType>144</ns2:submissionType>
        <ns2:filerInfo>
            <ns2:filer>
                <ns2:filerCredentials>
                    <ns2:cik>0001032235</ns2:cik>
                    <ns2:ccc>XXXXXXXX</ns2:ccc>
                </ns2:filerCredentials>
            </ns2:filer>
            <ns2:liveTestFlag>LIVE</ns2:liveTestFlag>



        </ns2:filerInfo>
    </ns2:headerData>
    <ns2:formData>
        <ns2:issuerInfo>
            <ns2:issuerCik>0001013857</ns2:issuerCik>
            <ns2:issuerName>Pegasystems Inc.</ns2:issuerName>
            <ns2:secFileNumber>001-11859</ns2:secFileNumber>
            <ns2:issuerAddress>
                <com:street1>225 Wyman Street</com:street1>
                <com:city>Waltham</com:city>
                <com:stateOrCountry>MA</com:stateOrCountry>
                <com:zipCode>02451</com:zipCode>
            </ns2:issuerAddress>
            <ns2:issuerContactPhone>1-617-374-9600</ns2:issuerContactPhone>
            <ns2:nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Alan Trefler</ns2:nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <ns2:relationshipsToIssuer>
                <ns2:relationshipToIssuer>Officer</ns2:relationshipToIssuer>
            </ns2:relationshipsToIssuer>
        </ns2:issuerInfo>
        <ns2:securitiesInformation>
            <ns2:securitiesClassTitle>Common Stock</ns2:securitiesClassTitle>
            <ns2:brokerOrMarketmakerDetails>
                <ns2:name>Goldman Sachs &amp; Co. LLC</ns2:name>
                <ns2:address>
                    <com:street1>200 West Street</com:street1>
                    <com:city>New York</com:city>
                    <com:stateOrCountry>NY</com:stateOrCountry>
                    <com:zipCode>10282</com:zipCode>
                </ns2:address>
            </ns2:brokerOrMarketmakerDetails>
            <ns2:noOfUnitsSold>216000</ns2:noOfUnitsSold>
            <ns2:aggregateMarketValue>20755440</ns2:aggregateMarketValue>
            <ns2:noOfUnitsOutstanding>85582250</ns2:noOfUnitsOutstanding>
            <ns2:approxSaleDate>05/27/2025</ns2:approxSaleDate>
            <ns2:securitiesExchangeName>NASD</ns2:securitiesExchangeName>
        </ns2:securitiesInformation>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common Stock</ns2:securitiesClassTitle>
            <ns2:acquiredDate>03/01/1983</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Founders Shares</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>The Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>216000</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>03/01/1983</ns2:paymentDate>
            <ns2:natureOfPayment>None</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:nothingToReportFlagOnSecuritiesSoldInPast3Months>N</ns2:nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <ns2:securitiesSoldInPast3Months>
            <ns2:sellerDetails>
                <ns2:name>Alan Trefler</ns2:name>
                <ns2:address>
                    <com:street1>225 Wyman Street</com:street1>
                    <com:city>Waltham</com:city>
                    <com:stateOrCountry>MA</com:stateOrCountry>
                    <com:zipCode>02451</com:zipCode>
                </ns2:address>
            </ns2:sellerDetails>
            <ns2:securitiesClassTitle>Common Stock</ns2:securitiesClassTitle>
            <ns2:saleDate>03/12/2025</ns2:saleDate>
            <ns2:amountOfSecuritiesSold>31500</ns2:amountOfSecuritiesSold>
            <ns2:grossProceeds>2286320.4</ns2:grossProceeds>
        </ns2:securitiesSoldInPast3Months>
        <ns2:securitiesSoldInPast3Months>
            <ns2:sellerDetails>
                <ns2:name>Alan Trefler</ns2:name>
                <ns2:address>
                    <com:street1>225 Wyman Street</com:street1>
                    <com:city>Waltham</com:city>
                    <com:stateOrCountry>MA</com:stateOrCountry>
                    <com:zipCode>02451</com:zipCode>
                </ns2:address>
            </ns2:sellerDetails>
            <ns2:securitiesClassTitle>Common Stock</ns2:securitiesClassTitle>
            <ns2:saleDate>04/16/2025</ns2:saleDate>
            <ns2:amountOfSecuritiesSold>31500</ns2:amountOfSecuritiesSold>
            <ns2:grossProceeds>2155050.45</ns2:grossProceeds>
        </ns2:securitiesSoldInPast3Months>
        <ns2:securitiesSoldInPast3Months>
            <ns2:sellerDetails>
                <ns2:name>Alan Trefler</ns2:name>
                <ns2:address>
                    <com:street1>225 Wyman Street</com:street1>
                    <com:city>Waltham</com:city>
                    <com:stateOrCountry>MA</com:stateOrCountry>
                    <com:zipCode>02451</com:zipCode>
                </ns2:address>
            </ns2:sellerDetails>
            <ns2:securitiesClassTitle>Common Stock</ns2:securitiesClassTitle>
            <ns2:saleDate>03/11/2025</ns2:saleDate>
            <ns2:amountOfSecuritiesSold>31500</ns2:amountOfSecuritiesSold>
            <ns2:grossProceeds>2234345.4</ns2:grossProceeds>
        </ns2:securitiesSoldInPast3Months>
        <ns2:securitiesSoldInPast3Months>
            <ns2:sellerDetails>
                <ns2:name>Alan Trefler</ns2:name>
                <ns2:address>
                    <com:street1>225 Wyman Street</com:street1>
                    <com:city>Waltham</com:city>
                    <com:stateOrCountry>MA</com:stateOrCountry>
                    <com:zipCode>02451</com:zipCode>
                </ns2:address>
            </ns2:sellerDetails>
            <ns2:securitiesClassTitle>Common Stock</ns2:securitiesClassTitle>
            <ns2:saleDate>04/17/2025</ns2:saleDate>
            <ns2:amountOfSecuritiesSold>31500</ns2:amountOfSecuritiesSold>
            <ns2:grossProceeds>2159167.5</ns2:grossProceeds>
        </ns2:securitiesSoldInPast3Months>
        <ns2:remarks>The sales of shares set forth herein are made in connection with a selling plan dated 11/6/2024, that is intended to comply with Rule 10b5-1(c).</ns2:remarks>
        <ns2:noticeSignature>
            <ns2:noticeDate>05/27/2025</ns2:noticeDate>
            <ns2:planAdoptionDates>
                <ns2:planAdoptionDate>11/06/2024</ns2:planAdoptionDate>
            </ns2:planAdoptionDates>
            <ns2:signature>Goldman Sachs &amp; Co. LLC on behalf of Alan Trefler</ns2:signature>
        </ns2:noticeSignature>
    </ns2:formData>
</ns2:edgarSubmission>
[{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 6811}]
144
0001032235
XXXXXXXX
LIVE
0001013857
Pegasystems Inc.
001-11859
225 Wyman Street
Waltham
MA
02451
1-617-374-9600
Alan Trefler
Officer
Common Stock
Goldman Sachs & Co. LLC
200 West Street
New York
NY
10282
216000
20755440
85582250
05/27/2025
NASD
Common Stock
03/01/1983
Founders Shares
The Issuer
N
216000
03/01/1983
None
N
Alan Trefler
225 Wyman Street
Waltham
MA
02451
Common Stock
03/12/2025
31500
2286320.4
Alan Trefler
225 Wyman Street
Waltham
MA
02451
Common Stock
04/16/2025
31500
2155050.45
Alan Trefler
225 Wyman Street
Waltham
MA
02451
Common Stock
03/11/2025
31500
2234345.4
Alan Trefler
225 Wyman Street
Waltham
MA
02451
Common Stock
04/17/2025
31500
2159167.5
The sales of shares set forth herein are made in connection with a selling plan dated 11/6/2024, that is intended to comply with Rule 10b5-1(c).
05/27/2025
11/06/2024
Goldman Sachs & Co. LLC on behalf of Alan Trefler