X0306 4 2023-02-28 0 0000040888 AEROJET ROCKETDYNE HOLDINGS, INC. AJRD 0001635474 Drake Eileen P. 222 N. PACIFIC COAST HIGHWAY, SUITE 500 EL SEGUNDO CA 90245 1 1 0 0 CEO and President Common Stock 2023-02-28 4 M 0 6563 A 68983 D Common Stock 2023-02-28 4 A 0 6250 A 75233 D Common Stock 2023-02-28 4 F 0 7234 56.34 D 67999 D Common Stock 297897 I EPD 2018 Trust Dated August 7, 2018 Restricted Stock Units 2023-02-28 4 M 0 6563 0.00 D Common Stock 6563 13128 D Each restricted stock unit ("RSU") represents a contingent right to receive one share of Aerojet Rocketdyne Holdings, Inc. common stock. 83,897 shares that were previously reported as directly owned on the Reporting Person's Form 4 filed December 19, 2022 have been transferred to the EPD 2018 Trust dated August 7, 2018 since that filing and are now being reported as indirectly owned. On February 28, 2019, the Reporting Person was granted 6,250 RSUs, vesting upon the achievement of certain performance targets. On February 27, 2023, achievement of the performance targets was certified by the Organization & Compensation Committee of the Issuer's Board of Directors. Shares relinquished to pay withholding taxes payable in connection with the vesting of RSUs granted to the Reporting Person on February 28, 2019 and December 21, 2021. The RSUs vest in three equal annual installments beginning on February 28, 2023. /s/ David A. Fox, attorney-in-fact 2023-03-02