144 0001862964 XXXXXXXX LIVE 0000764622 Pinnacle West Capital Corporation 001-08962 400 North 5th Street PO Box 53999 Phoenix AZ 85004 602-250-3958 Jacob Tetlow EVP, COO, APS Common Stock Wells Fargo Advisors

One North Jefferson Avenue St. Louis MO 63103

9474 870755 113699820 11/12/2024 NYSE Common Stock 02/20/2020 Stock issued in connection with awards granted under the Company's Long Term Incentive Plan Pinnacle West Capital Corporation N 341 02/20/2020 N/A Common Stock 11/09/2020 Stock issued in connection with awards granted under the Company's Long Term Incentive Plan Pinnacle West Capital Corporation N 485 11/09/2020 N/A Common Stock 02/19/2021 Stock issued in connection with awards granted under the Company's Long Term Incentive Plan Pinnacle West Capital Corporation N 449 02/19/2021 N/A Common Stock 11/04/2021 Stock issued in connection with awards granted under the Company's Long Term Incentive Plan Pinnacle West Capital Corporation N 604 11/04/2021 N/A Common Stock 02/18/2022 Stock issued in connection with awards granted under the Company's Long Term Incentive Plan Pinnacle West Capital Corporation N 751 02/18/2022 N/A Common Stock 10/19/2022 Stock issued in connection with awards granted under the Company's Long Term Incentive Plan Pinnacle West Capital Corporation N 523 10/19/2022 N/A Common Stock 02/17/2023 Stock issued in connection with awards granted under the Company's Long Term Incentive Plan Pinnacle West Capital Corporation N 1015 02/17/2023 N/A Common Stock 10/17/2023 Stock issued in connection with awards granted under the Company's Long Term Incentive Plan Pinnacle West Capital Corporation N 808 10/17/2023 N/A Common Stock 02/20/2024 Stock issued in connection with awards granted under the Company's Long Term Incentive Plan Pinnacle West Capital Corporation N 2598 02/20/2024 N/A Common Stock 10/22/2024 Stock issued in connection with awards granted under the Company's Long Term Incentive Plan Pinnacle West Capital Corporation N 1900 10/22/2024 N/A Y Aggregate value based on 11/11/24 stock price. Number of shares outstanding as of 10/30/2024. The filing of this Form 144 shall not be construed as an admission that the undersigned is an Affiliate of the Issuer. 11/13/2024 /s/ Diane Wood, Attorney-in-Fact