X0508 4 2023-09-01 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 2023-09-01 4 A 0 26071 0 A 169223 D Common Stock 20500 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 29, 2023. The Restricted Stock Units were received as a grant for no consideration. Reflects securities transferred pursuant to Rule 16a-13 under the Securities Exchange Act of 1934, as amended. Reflects shares held by the Antonio J. Pietri 2023 Qualified Annuity Interest Trust. /s/Mark E. Mouritsen, attorney-in fact for Mr. Pietri 2023-09-06