X0306 4 2019-06-03 0 0001013857 PEGASYSTEMS INC PEGA 0001480560 Trefler Leon C/O PEGASYSTEMS INC. 1 ROGERS STREET CAMBRIDGE MA 02142 0 1 0 0 SVP, Global Customer Success Common Stock 2019-06-03 4 M 0 1854 18.03 A 11627 D Common Stock 2019-06-03 4 F 0 1073 72.15 D 10554 D Common Stock 2019-06-03 4 S 0 781 71.18 D 9773 D Common Stock 2019-06-03 4 M 0 619 0.00 A 10392 D Common Stock 2019-06-03 4 F 0 276 72.14 D 10116 D Common Stock 2019-06-03 4 M 0 370 0.00 A 10486 D Common Stock 2019-06-03 4 F 0 165 72.14 D 10321 D Common Stock 2019-06-05 4 M 0 362 0.00 A 10683 D Common Stock 2019-06-05 4 F 0 161 69.91 D 10522 D Stock Options 18.03 2019-06-03 4 M 0 1854 0.00 D 2013-03-07 2022-03-07 Common Stock 1854 3062 D Restricted Stock Units 0.00 2019-06-03 4 M 0 619 0.00 D 2016-03-02 Common Stock 619 1859 D Restricted Stock Units 0.00 2019-06-03 4 M 0 370 0.00 D 2018-03-02 Common Stock 370 4063 D Restricted Stock Units 0.00 2019-06-05 4 M 0 362 0.00 D 2019-03-05 Common Stock 362 5435 D Represents the exercise price of the Stock Options referenced in Table II and Mr. Trefler's tax liability, which were paid by way of the Company withholding shares of equal value. Sold pursuant to a pre-arranged stock trading plan under rule 10b5-1 of the Securities Exchange Act of 1934, as amended. Represents the weighted average of the sale prices on June 3, 2019, ranging from $71.16 to $71.24. The individual has provided the Company, and undertakes to provide to the staff of the Securities and Exchange Commission or any security holder of the Company, upon request, full information regarding the number of shares sold at each separate price. Represents 5% vesting on June 2, 2019, with a release date of June 3, 2019, the first business day following the vesting. The original grant was 12,383 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 June 2, 2019, with a release date of June 3, 2019, the first business day following the vesting. The original grant was 7,387 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 June 5, 2019. The original grant was 7,246 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. Options vested 20% on March 7, 2013, with the remaining 80% vesting in equal quarterly installments over the next four years. 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 Leon Trefler 2019-06-05