X0306 4 2019-02-28 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 2019-02-28 4 M 0 955 25.20 A 1639 D Common Stock 2019-02-28 4 F 0 570 66.03 D 1069 D Common Stock 2019-02-28 4 S 0 385 66.00 D 684 D Common Stock 2019-02-28 4 M 0 314 27.24 A 998 D Common Stock 2019-02-28 4 F 0 184 66.03 D 814 D Common Stock 2019-02-28 4 S 0 130 66.00 D 684 D Stock Options 25.20 2019-02-28 4 M 0 955 0.00 A 2017-03-09 2026-03-09 Common Stock 955 10038 D Stock Options 27.24 2019-02-28 4 M 0 314 0.00 A 2017-09-12 2026-09-12 Common Stock 314 3451 D Represents the exercise price of the Stock Options referenced in Table II and Mr. Kouninis's tax liability, which were paid by way of withholding by the Company of shares of equal value. Does not include shares of common stock subject to unvested restricted stock units and/or options awards. Options vest 20% on March 9, 2017, and the remaining 80% vest in equal quarterly installments over the remaining four years. Options vest 20% on September 12, 2017, and the remaining 80% vest in equal quarterly installments over the remaining four years. /s/ Janet Mesrobian, Esq., Attorney-In-Fact for Efstathios Kouninis 2019-03-04