X0407 4 2023-06-12 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 2023-06-12 4 M 0 3114 36.53 A 8954 D Common Stock 2023-06-12 4 S 0 3114 164.56 D 5840 D Director Stock Option (Right to Buy) 36.53 2023-06-12 4 M 0 3114 0 D 2023-07-31 Common Stock 3114 0 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $164.40 to $164.60, 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, upon request, full information regarding the number of shares sold at each separate price within the applicable ranges. The option granted at the exercise price of $36.53 was fully vested on the date of grant. /s/Mark Mouritsen, attorney-in-fact for Mr. Whelan 2023-06-14