X0306 4 2022-09-07 0001897982 Aspen Technology, Inc. AZPN 0001332920 Hammond F G C/O ASPEN TECHNOLOGY, INC. 20 CROSBY DRIVE BEDFORD MA 01730 1 Senior VP & General Counsel Common Stock 2022-09-07 4 M 0 2810 129.48 A 24868 D Common Stock 2022-09-07 4 S 0 1331 210.64 D 23537 D Common Stock 2022-09-07 4 S 0 1803 211.64 D 21734 D Common Stock 2022-09-07 4 S 0 1091 212.52 D 20643 D Common Stock 2022-09-07 4 S 0 37 213.25 D 20606 D Employee Stock Option (Right to Buy) 129.48 2022-09-07 4 M 0 2810 0 D 2028-09-03 Common Stock 2810 0 D The options exercised and sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 3, 2022. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $210.00 to $210.91, 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 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 $211.12 to $212.06, 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 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 $212.15 to $213.11, 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 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 $213.24 to $213.26, 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 range set forth in this footnote. The option granted at the exercise price of $129.48 vests, subject to rounding, in 16 equal consecutive quarterly installments on the last business day of the quarter, beginning with the quarter ending September 30, 2018. /s/ F. G. Hammond 2022-09-09