X0306 4/A 2022-12-05 2022-12-07 0 0000040888 AEROJET ROCKETDYNE HOLDINGS, INC. AJRD 0001730069 BOEHLE DANIEL L. 222 N. PACIFIC COAST HIGHWAY, SUITE 500 EL SEGUNDO CA 90245 0 1 0 0 CFO and VP Common Stock 2022-12-05 4 F 0 21360 53.84 D 73623 D On December 7, 2022, the reporting person filed a Form 4 which reported that 10,680 shares were relinquished to pay withholding taxes payable in connection with an election made pursuant to Section 83(b) of the Internal Revenue Code (the "Section 83(b) election") to withhold shares with respect to 50% of the grants of restricted stock granted on December 5, 2022. The Section 83(b) election has been amended to withhold shares with respect to 100% of the grants of restricted stock granted on December 5, 2022, resulting in 21,360 shares relinquished to pay withholding taxes payable in connection with the Section 83(b) election, as now reported in this amendment. /s/ Rebecca Bauer, Attorney-in-Fact 2022-12-19