144 0001628362 XXXXXXXX LIVE 0000764622 Pinnacle West Capital Corporation 001-08962 400 North 5th Street P.O. Box53999 Phoenix AZ 85004 602-250-3958 Robert E. Smith Officer Common Stock ETrade

P.O. Box 484 Jersey City NJ 07303-0484

4950 422334 113611506 08/09/2024 NYSE Common Stock 02/18/2022 Stock issued in connection with awards granted under the Company's Long TermIncentive Plan Pinnacle West Capital Corporation N 800 02/18/2022 N/A Common Stock 12/01/2022 Dividend Reinvest Pinnacle West Capital Corporation N 79 12/01/2022 N/A Common Stock 02/17/2023 Stock issued in connection with awards granted under the Company's Long TermIncentive Plan Pinnacle West Capital Corporation N 1298 02/17/2023 N/A Common Stock 02/17/2023 Dividend Equivalent Pinnacle West Capital Corporation N 127 02/17/2023 N/A Common Stock 03/01/2023 Dividend Reinvest Pinnacle West Capital Corporation N 85 03/01/2022 N/A Common Stock 06/01/2023 Dividend Reinvest Pinnacle West Capital Corporation N 99 06/01/2023 N/A Common Stock 10/17/2023 Stock issued in connection with awards granted under the Company's Long TermIncentive Plan Pinnacle West Capital Corporation N 1657 10/17/2023 N/A Common Stock 10/17/2023 Dividend Equivalent Pinnacle West Capital Corporation N 279 10/17/2023 N/A Common Stock 02/20/2024 Dividend Equivalent Pinnacle West Capital Corporation N 168 02/20/2024 N/A Common Stock 02/20/2024 Stock issued in connection with awards granted under the Company's Long TermIncentive Plan Pinnacle West Capital Corporation N 287 02/20/2024 N/A Common Stock 06/01/2022 Dividend Reinvest Pinnacle West Capital Corporation N 22 06/01/2022 N/A Common Stock 03/01/2022 Dividend Reinvest Pinnacle West Capital Corporation N 13 03/01/2022 N/A Common Stock 09/01/2022 Dividend Reinvest Pinnacle West Capital Corporation N 22 09/01/2022 N/A Common Stock 12/01/2021 Dividend Reinvest Pinnacle West Capital Corporation N 14 12/01/2021 N/A Y Aggregate value based on 8/6/24 stock price. Number of shares outstanding as of 7/25/24. The filing of this Form 144 shall not be construed as an admission that the undersigned is an Affiliate of the Issuer. 08/09/2024 /s/ Robert E. Smith