X0306 4 2021-03-22 0000929940 ASPEN TECHNOLOGY INC /DE/ AZPN 0001850596 Breithaupt Chantelle Yvette C/O ASPEN TECHNOLOGY, INC. 20 CROSBY DRIVE BEDFORD MA 01730 1 SVP, Chief Financial Officer Common Stock 2021-03-22 4 A 0 10265 0 A 10265 D Common Stock 2021-03-22 4 A 0 3360 0 A 13625 D Common Stock 2021-03-22 4 F 0 1220 148.82 D 12405 D Employee Stock Option (Right to Buy) 148.82 2021-03-22 4 A 0 21257 148.82 A 2031-03-21 Common Stock 21257 21257 D Each Restricted Stock Unit represents a contingent right to receive one share of Aspen Technology, Inc. common stock. The Restricted Stock Units vest in 16 equal consecutive installments on the last business of the quarter beginning with the quarter ending June 30, 2021. 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. Shares withheld by Registrant to satisfy minimum statutory withholding requirements on vesting of Restricted Stock Units and distribution of stock. The option granted at the exercise price of $148.82 vests in 16 equal consecutive quarterly installments on the last business day of the quarter beginning with the quarter ending June 30, 2021. /s/F.G. Hammond,attorney-in-fact for Ms. Breithaupt 2021-03-24