X0609 4 2026-09-11 0 0001013857 PEGASYSTEMS INC PEGA 0001680115 STILLWELL KENNETH false C/O PEGASYSTEMS INC. 225 WYMAN STREET, STE 300 WALTHAM MA 02451 0 1 0 0 COO, CFO 0 Common stock 2026-09-11 4 S 0 39627 35.7695 D 95225 D Common stock 1908 I Reporting Person's children Represents the weighted average of sale prices, ranging from $35.7400 to $35.8350. The individual has provided the Company, and undertakes to provide to the staff of the Security and Exchange Commission or any security holder of the Company, upon request, full information regarding the number of shares sold at each separate price. /s/ Ewelina Kemp, Attorney-in-Fact for Kenneth Stillwell 2026-09-15