X0306 4 2019-09-03 0 0001013857 PEGASYSTEMS INC PEGA 0001353196 KOUNINIS EFSTATHIOS A C/O PEGASYSTEMS INC. 1 ROGERS STREET CAMBRIDGE MA 02142 0 1 0 0 VP of Finance & CAO Common Stock 2019-09-03 4 M 0 309 0.00 A 309 D Common Stock 2019-09-03 4 F 0 92 70.15 D 217 D Common Stock 2019-09-03 4 M 0 171 0.00 A 388 D Common Stock 2019-09-03 4 F 0 51 70.15 D 337 D Common Stock 2019-09-05 4 M 0 128 0.00 A 465 D Common Stock 2019-09-05 4 F 0 38 70.16 D 427 D Restricted Stock Units 0.00 2019-09-03 4 M 0 309 0.00 D 2016-03-02 Common Stock 309 620 D Restricted Stock Units 0.00 2019-09-03 4 M 0 171 0.00 D 2018-03-02 Common Stock 171 1705 D Restricted Stock Units 0.00 2019-09-05 4 M 0 128 0.00 D 2019-03-05 Common Stock 128 1791 D Represents 5% vesting on September 2, 2019, with a release date of September 3, 2019, the first business day following the vesting. The original grant was 6,192 restricted stock units, with 20% vesting on March 2, 2016, and the remaining 80% vesting in equal quarterly installments over the remaining four years. Represents 5% vesting on September 2, 2019, with a release date of September 3, 2019, the first business day following the vesting. The original grant was 3,410 restricted stock units, with 20% vesting on March 2, 2018, and the remaining 80% vesting in equal quarterly installments over the remaining four years. Represents 5% vesting on September 5, 2019. The original grant was 2,558 restricted stock units, with 20% vesting on March 5, 2019, and the remaining 80% vesting in equal quarterly installments over the remaining four years. Does not include shares of common stock subject to unvested restricted stock units and/or options awards. Each restricted stock unit represents the right to receive, following vesting, one share of the issuer's common stock. Once vested, the shares of common stock are not subject to expiration. /s/ Janet Mesrobian, Esq., Attorney-in-Fact for Efstathios A. Kouninis 2019-09-05