X0306 4 2019-03-04 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 2019-03-04 4 M 0 309 0.00 A 993 D Common Stock 2019-03-04 4 F 0 89 66.32 D 904 D Common Stock 2019-03-04 4 M 0 171 0.00 A 1075 D Common Stock 2019-03-04 4 F 0 49 66.32 D 1026 D Common Stock 2019-03-05 4 M 0 890 0.00 A 1916 D Common Stock 2019-03-05 4 F 0 259 64.84 D 1657 D Common Stock 2019-03-05 4 M 0 511 0.00 A 2168 D Common Stock 2019-03-05 4 F 0 151 64.84 D 2017 D Restricted Stock Units 0.00 2019-03-04 4 M 0 309 0.00 D 2016-03-02 Common Stock 309 1239 D Restricted Stock Units 0.00 2019-03-04 4 M 0 171 0.00 D 2018-03-02 Common Stock 171 2046 D Restricted Stock Units 0.00 2019-03-05 4 M 0 890 0.00 D 2019-03-05 Common Stock 890 0 D Restricted Stock Units 0.00 2019-03-05 4 M 0 511 0.00 D 2019-03-05 Common Stock 511 2047 D Represents 5% vesting on March 2, 2019, with a release date of March 4, 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 4 years. Represents 5% vesting on March 2, 2019, with a release date of March 4, 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 4 years. Represents 100% vesting on March 5, 2019. The original grant was 890 restricted stock units, which were granted on March 5, 2018. As part of the Company's 2018 Corporate Incentive Plan (CICP), Mr. Kouninis elected to receive his annual bonus in RSUs. Represents 20% vesting on March 5, 2019. The original grant was 2,558 restricted stock units, with the remaining 80% vesting in equal quarterly installments over the remaining 4 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 Kouninis 2019-03-06