144 0001862964 XXXXXXXX LIVE 0000764622 Pinnacle West Capital Corporation 001-08962 400 North 5th Street PO Box 53999 Phoenix AZ 85004 602-250-4402 Jacob Tetlow EVP and COO, APS Common Stock Wells Fargo Advisors One North Jefferson Avenue St. Louis MO 63103 6567 654795.57 121187166 05/12/2026 NYSE Common Stock 03/18/2026 Stock issued in connection with awards granted under the Company's Long-Term Incentive Plan Pinnacle West Capital Corporation N 6567 03/18/2026 N/A Y Aggregate value based on 5/11/26 stock price. Number of shares outstanding as of 4/28/26. The filing of this Form 144 shall not be construed as an admission that the undersigned is an Affiliate of the Issuer. 05/12/2026 /s/ Jacob Tetlow