144 0001628362 XXXXXXXX LIVE 0000764622 Pinnacle West Capital Corporation 001-08962 400 North Fifth Street, P.O. Box 53999 Phoenix AZ 85072-3999 (602)-250-1000 Robert E. Smith Officer Common Stock E*TRADE from Morgan Stanley

PO Box 484 Jersey City NJ 07303-0484

1610 122698.10 113398346 12/08/2023 NYSE Common Stock 02/20/2019 Stock issued in connection with awards granted under the Company's Long Term Incentive Plan Pinnacle West Capital Corporation N 338 02/20/2019 N/A 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 946 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 326 11/09/2020 N/A Y Aggregate value based on 12/6/2023 stock price. Number of shares outstanding as of 10/27/2023. The filing of this Form 144 shall not be construed as an admission that the undersigned is an Affiliate of the Issuer. 12/08/2023 /s/ Robert E. Smith