144 0001330532 XXXXXXXX LIVE 0001013857 PEGASYSTEMS INC. 001-11859 One Main Street Cambridge MA 02142 (617) 374-9600 LAWRENCE WEBER Director Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

1900 166877.00 85753808 11/11/2024 NASDAQ COMMON 12/21/2017 Restricted stock vesting under a registered plan ISSUER N 522 12/21/2017 Not Applicable COMMON 12/28/2018 Restricted stock vesting under a registered plan ISSUER N 380 12/28/2018 Not Applicable COMMON 08/16/2021 Restricted stock vesting under a registered plan ISSUER N 317 08/16/2021 Not Applicable COMMON 03/10/2017 Restricted stock vesting under a registered plan ISSUER N 681 03/10/2017 Not Applicable Y Sales that were executed on November 11, 2024 are being reported on this Form 144 filed on November 12, 2024 given the EDGAR system was not accepting filings on November 11, 2024 in observance of the federal holiday. 11/11/2024 /s/ Lawrence Weber