X0508 4 2024-08-28 0001897982 Aspen Technology, Inc. AZPN 0001490045 Whelan, Jr. Robert M. C/O ASPEN TECHNOLOGY, INC. 20 CROSBY DRIVE BEDFORD MA 01730 1 0 Common Stock 2024-08-28 4 S 0 785 218.99 D 8755 D Common Stock 2024-08-28 4 S 0 215 219.52 D 8540 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $218.34 to $219.33 inclusive. The reporting person undertakes to provide to Aspen Technology, Inc., any security holder of Aspen Technology, Inc., or the staff of the Securities and Exchange Commission number of shares sold at each separate price within the applicable range set forth in this footnote. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $219.38 to $219.86 inclusive. The reporting person undertakes to provide to Aspen Technology, Inc., any security holder of Aspen Technology, Inc., or the staff of the Securities and Exchange Commission number of shares sold at each separate price within the applicable range set forth in this footnote. /s/ Christopher A. Cooper, attorney-in-fact for Mr. Whelan 2024-08-30