X0306 4 2022-11-21 0001897982 Aspen Technology, Inc. AZPN 0001407695 Pietri Antonio J C/O ASPEN TECHNOLOGY, INC. 20 CROSBY DRIVE BEDFORD MA 01730 1 1 President & CEO Common Stock 2022-11-21 4 M 0 49921 49.81 A 220175 D Common Stock 2022-11-21 4 M 0 40481 51.03 A 260656 D Common Stock 2022-11-21 4 M 0 35405 70.99 A 296061 D Common Stock 2022-11-21 4 S 0 63766 231.11 D 232295 D Common Stock 2022-11-21 4 S 0 8081 232.67 D 224214 D Common Stock 2022-11-21 4 S 0 5188 233.29 D 219026 D Common Stock 2022-11-21 4 S 0 1300 234.39 D 217726 D Common Stock 2022-11-21 4 S 0 7069 235.69 D 210657 D Common Stock 2022-11-21 4 S 0 13285 236.60 D 197372 D Common Stock 2022-11-21 4 S 0 9255 237.61 D 188117 D Common Stock 2022-11-21 4 S 0 4159 238.81 D 183958 D Common Stock 2022-11-21 4 S 0 4133 239.91 D 179825 D Common Stock 2022-11-21 4 S 0 3258 240.81 D 176567 D Common Stock 2022-11-21 4 S 0 2400 242.81 D 174167 D Common Stock 2022-11-21 4 S 0 1008 242.85 D 173159 D Common Stock 2022-11-21 4 S 0 2905 243.87 D 170254 D Employee Stock Option (Right to Buy) 49.81 2022-11-21 4 M 0 49921 0 D 2025-08-02 Common Stock 49921 12834 D Employee Stock Option (Right to Buy) 51.03 2022-11-21 4 M 0 40481 0 D 2026-08-31 Common Stock 40481 36284 D Employee Stock Option (Right to Buy) 70.99 2022-11-21 4 M 0 35405 0 D 2027-08-31 Common Stock 35405 27482 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $231.00 to $232.00, 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 set forth in footnotes (1) through (13) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $232.01 to $233.01, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $233.02 to $234.01, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $234.09 to $234.71, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $235.155 to $236.13, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $236.16 to $237.11, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $237.165 to $238.15, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $238.35 to $239.34, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $239.39 to $240.39, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $240.42 to $241.21, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $241.43 to $242.43, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $242.44 to $243.44, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $243.46 to $244.22, inclusive. The option granted at the exercise price of $49.81 vested in 16 equal consecutive quarterly installments on the last business day of the quarter, beginning on September 30, 2015. The option granted at the exercise price of $51.03 vested in 16 equal consecutive quarterly installments on the last business day of the quarter, beginning on September 30, 2016. The option granted at the exercise price of $70.99 vests in 16 equal consecutive quarterly installments on the last business day of the quarter, beginning on December 31, 2020. /s/ F.G. Hammond, attorney-in-fact for Mr. Pietri 2022-11-23