X0508 4 2025-03-11 1 0001897982 Aspen Technology, Inc. AZPN 0001572329 Stagno Christopher C/O ASPEN TECHNOLOGY, INC. 20 CROSBY DRIVE BEDFORD MA 01730 1 CVP, Chief Accounting Officer 0 Common Stock 2025-03-11 4 J 0 3711 D 0 D Common Stock 2025-03-12 4 D 0 2103 D 0 D Employee Stock Option (Right to Buy) 138.93 2025-03-12 4 D 0 1731 D 2024-09-13 Common Stock 1731 0 D Employee Stock Option (Right to Buy) 145.35 2025-03-12 4 D 0 1482 D 2031-08-31 Common Stock 1482 0 D Employee Stock Option (Right to Buy) 210.60 2025-03-12 4 D 0 899 D 2032-08-31 Common Stock 899 0 D This Form 4 reports securities disposed of pursuant to the terms of the Agreement and Plan of Merger (the "Merger Agreement"), dated as of January 26, 2025, among Aspen Technology, Inc. (the "Issuer"), Emerson Electric Co. ("Parent"), and Emersub CXV, Inc., a wholly owned subsidiary of Parent ("Purchaser"), pursuant to which Purchaser completed a cash tender offer for shares of common stock of the Issuer (each, a "Share") not already owned by Parent and thereafter merged with and into the Issuer, effective as of March 12, 2025 (the "Effective Time"). At the Effective Time, each issued and outstanding Share was cancelled and converted into the right to receive $265.00 in cash (the "Merger Consideration"), without interest and less any applicable tax withholding. Represents restricted stock units ("RSUs") granted to the Reporting Person. Each RSU represented a contingent right to receive one Share upon vesting of the RSU (a "Company RSU"). Pursuant to the Merger Agreement, at the Effective Time, each Company RSU reported in this Form 4 was cancelled and converted into an award of RSUs with respect to shares of common stock of Parent (each, a "Parent RSU"). The number of Parent shares applicable to each Parent RSU is equal to (i) the number of Shares underlying each Company RSU multiplied by (ii) the Equity Award Exchange Ratio (as defined in the Merger Agreement), rounded down to the nearest whole number of Parent shares. Each Parent RSU is subject to the same terms and conditions, including vesting schedule, that applied to the corresponding Company RSU prior to the Effective Time. Pursuant to the Merger Agreement, at the Effective Time, each option (whether vested or unvested) that was outstanding and unexercised immediately prior to the Effective Time, was cancelled and converted into the right to receive, for each Share underlying such option, an amount in cash, without interest, less any applicable tax withholding, equal to the excess, if any, of the Merger Consideration over the exercise price per share of such option. Each option that was outstanding and unexercised immediately prior to the Effective Time which had a per share exercise price greater than or equal to the Merger Consideration was cancelled with no consideration payable. /s/ Christopher A. Cooper, attorney-in-fact for Mr. Stagno 2025-03-13