X0306 4 2023-02-17 0 0000764622 PINNACLE WEST CAPITAL CORP PNW 0001816721 Cooper Andrew D 400 NORTH FIFTH STREET MAIL STATION 8602 PHOENIX AZ 85004 0 1 0 0 SVP & CFO Common Stock 2023-02-17 4 M 0 120 A 354 D Common Stock 2023-02-17 4 D 0 120 75.10 D 234 D Common Stock 2023-02-17 4 M 0 120 A 354 D Common Stock 2023-02-17 4 F 0 50 75.10 D 304 D Common Stock 2023-02-17 4 M 0 165 A 469 D Common Stock 2023-02-17 4 D 0 165 75.10 D 304 D Common Stock 2023-02-17 4 M 0 164 A 468 D Common Stock 2023-02-17 4 F 0 68 75.10 D 400 D Common Stock 2023-02-17 4 M 0 429 A 829 D Common Stock 2023-02-17 4 D 0 20 0.00 D 809 D Common Stock 2023-02-17 4 F 0 189 75.10 D 620 D Common Stock 2023-02-17 4 M 0 879 A 1499 D Common Stock 2023-02-17 4 D 0 31 0.00 D 1468 D Common Stock 2023-02-17 4 F 0 400 75.10 D 1068 D Common Stock 2023-02-17 4 A 0 31 A 1099 D Common Stock 2023-02-17 4 F 0 14 75.10 D 1085 D Restricted Stock Units 2023-02-17 4 M 0 240 D Common Stock 240 240 D Restricted Stock Units 2023-02-17 4 M 0 329 D Common Stock 329 658 D Restricted Stock Units 2023-02-17 4 M 0 429 D Common Stock 429 1286 D Restricted Stock Units 2023-02-17 4 M 0 879 D Common Stock 879 2635 D Each Restricted Stock Unit represents a contingent right to receive the economic equivalent of one share of the Company's common stock. The Restricted Stock Units will be settled, at the reporting person's election, in 100% shares of common stock, 50% in common stock and 50% in cash, or 100% in cash. Shares retained by the Company for the purpose of meeting tax withholding requirements. The recipient retained all other shares. Each Restricted Stock Unit represents a contingent right to receive the economic equivalent of one share of the Company's common stock. The Restricted Stock Units will be settled either in 100% shares of common stock or 100% in cash with respect to Restricted Stock Units received in connection with the settlement of dividend equivalent rights. Represents the cash settlement of Restricted Stock Units received in connection with the settlement of dividend equivalent rights. Represents shares of common stock received by the individual in settlement of dividend rights granted in connection with the 2020 and 2021 Restricted Stock Unit grants. The Restricted Stock Units award was granted and was effective in February 2020, and vests in four equal, annual installments beginning on February 20, 2021. The Restricted Stock Units award was granted and was effective in February 2021, and vests in four equal, annual installments beginning on February 20, 2022. The number of derivative securities in Column 5 includes 20 vested Restricted Stock Units received in connection with the settlement of dividend equivalent rights. Dividend equivalent rights accrue with respect to these Restricted Stock Units when and as cash dividends are paid on the Company's common stock. The Restricted Stock Units award was granted and was effective in February 2022, and vests in four equal, annual installments beginning on February 20, 2023. Includes 59 Restricted Stock Units received in connection with the settlement of dividend equivalent rights. The number of derivative securities in Column 5 includes 31 vested Restricted Stock Units received in connection with the settlement of dividend equivalent rights. Dividend equivalent rights accrue with respect to these Restricted Stock Units when and as cash dividends are paid on the Company's common stock. The Restricted Stock Units award was granted and was effective in May 2022, and vests in four equal, annual installments beginning on February 20, 2023. Includes 91 Restricted Stock Units received in connection with the settlement of dividend equivalent rights. /s/ Diane Wood, Attorney-in-Fact 2023-02-21