X0508 4 2023-09-01 0001897982 Aspen Technology, Inc. AZPN 0001964545 Mouritsen Mark Edgar C/O ASPEN TECHNOLOGY, INC. 20 CROSBY DRIVE BEDFORD MA 01730 1 SVP, General Counsel 0 Common Stock 2023-09-01 4 A 0 4172 0 A 12900 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 Restricted Stock Units were received as a grant for no consideration. /s/ Mark E. Mouritsen 2023-09-06