X0508 4/A 2023-09-01 2023-09-06 0001897982 Aspen Technology, Inc. AZPN 0001572329 Stagno Christopher C/O ASPEN TECHNOLOGY, INC. 20 CROSBY DRIVE BEDFORD MA 01730 1 SVP, Chief Accounting Officer 0 Common Stock 2023-09-01 4 A 0 783 0 A 4926 D Each Restricted Stock Unit represents a contingent right to receive one share of Aspen Technology, Inc. common stock. Subject to rounding, the Restricted Stock Units vest in 12 equal consecutive quarterly installments on the last business day of the quarter beginning with the quarter ending September 29, 2023. The original amount of Restricted Stock Units granted as reported in the Form 4 filed on September 6, 2023 has been adjusted resulting in an increase of 131 Restricted Stock Units to Mr. Stagno's beneficial ownership as reflected. The Restricted Stock Units were received as a grant for no consideration. /s/Mark E. Mouritsen, attorney-in fact for Mr. Stagno 2023-09-22