X0508 4 2024-09-03 0001897982 Aspen Technology, Inc. AZPN 0001407695 Pietri Antonio J C/O ASPEN TECHNOLOGY, INC. 20 CROSBY DRIVE BEDFORD MA 01730 1 1 President & CEO 0 Common Stock 2024-09-03 4 A 0 24819 0 A 183666 D Common Stock 11450 I By GRAT 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 30, 2024. The Restricted Stock Units were received as a grant for no consideration. 9,050 shares previously reported as owned through the GRAT are now included in shares reported as directly owned. /s/Christopher A. Cooper, attorney-in fact for Mr. Pietri 2024-09-05