X0508 4 2023-09-01 0001897982 Aspen Technology, Inc. AZPN 0001543512 Shenkman Arlen 20 CROSBY DRIVE BEDFORD MA 01730 1 0 Common Stock 2023-09-01 4 A 0 1252 0 A 2012 D Common Stock 2023-09-01 4 A 0 1252 0 A 3264 D Each Restricted Stock Unit represents a contingent right to receive one share of Aspen Technology, Inc. common stock. The Restricted Stock Units were fully vested on the date of grant. The Restricted Stock Units were received as a grant for no consideration. Each Restricted Stock Unit represents a contingent right to receive one share of Aspen Technology, Inc. common stock. The Restricted Stock Units will fully vest on the first anniversary of the date of grant. /s/Mark E. Mouritsen, attorney-in-fact for Mr. Shenkman 2023-09-06