X0306 4 2019-08-01 0 0001013857 PEGASYSTEMS INC PEGA 0001680115 STILLWELL KENNETH C/O PEGASYSTEMS INC ONE ROGERS STREET CAMBRIDGE MA 02142 0 1 0 0 CFO, SVP Common Stock 2019-08-01 4 M 0 2187 0.00 A 10233 D Common Stock 2019-08-01 4 F 0 973 75.60 D 9260 D Common Stock 2019-08-01 4 M 0 10576 27.74 A 19836 D Common Stock 2019-08-01 4 F 0 6860 75.49 D 12976 D Common Stock 2019-08-01 4 S 0 872 75.07 D 12104 D Common Stock 2019-08-01 4 S 0 4844 76.21 D 7260 D Restricted Stock Units 0.00 2019-08-01 4 M 0 2187 0.00 D 2017-08-01 Common Stock 2187 17493 D Stock Options 27.74 2019-08-01 4 M 0 10576 0.00 D 2017-08-01 2026-08-01 Common Stock 10576 87107 D Represents a 5% vesting on August 1, 2019. The original grant was 43,732 restricted stock units, with 20% vesting on August 1, 2017, and the remaining 80% vesting in equal quarterly amounts over the remaining four years. Represents the exercise price of the Stock Options referenced in Table II and Mr. Stillwell's tax liability, which were paid by way of withholding by the Company of 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 August 1, 2019, ranging from $74.83 to $75.48. The individual has provided to 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 the weighted average of the sale prices on August 1, 2019, ranging from $75.91 to $76.40. The individual has provided to 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. 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. Options vested 20% on August 1, 2017, with the remaining 80% vesting in equal quarterly installments over the next four years. /s/ Janet Mesrobian, Esq., Attorney-in-Fact for Kenneth Stillwell 2019-08-05