144 0001780676 XXXXXXXX LIVE 0000764622 Pinnacle West Capital Corporation 001-08962 400 North 5th Street PO Box 53999 Phoenix AZ 85004 602-250-4402 Elizabeth A Blankenship VP Controller and CAO Common Stock Cerity Partners 7659 E Pinnacle Peak Rd., Suite 100 Scottsdale AZ 85255 980 98803.6 121197234 08/07/2026 NYSE Common Stock 02/20/2015 Stock issued in connection with awards granted under the Company's Long-Term Incentive Plan Pinnacle West Capital Corporation N 30 02/20/2015 N/A Common Stock 02/19/2016 Stock issued in connection with awards granted under the Company's Long-Term Incentive Plan Pinnacle West Capital Corporation N 59 02/19/2016 N/A Common Stock 02/17/2017 Stock issued in connection with awards granted under the Company's Long-Term Incentive Plan Pinnacle West Capital Corporation N 84 02/17/2017 N/A Common Stock 02/20/2018 Stock issued in connection with awards granted under the Company's Long-Term Incentive Plan Pinnacle West Capital Corporation N 198 02/20/2018 N/A Common Stock 02/20/2018 Stock issued in connection with awards granted under the Company's Long-Term Incentive Plan Pinnacle West Capital Corporation N 94 02/20/2018 N/A Common Stock 10/17/2018 Stock issued in connection with awards granted under the Company's Long-Term Incentive Plan Pinnacle West Capital Corporation N 235 10/17/2018 N/A Common Stock 02/19/2019 Stock issued in connection with awards granted under the Company's Long-Term Incentive Plan Pinnacle West Capital Corporation N 213 02/19/2019 N/A 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 60 02/20/2019 N/A Common Stock 10/22/2019 Stock issued in connection with awards granted under the Company's Long-Term Incentive Plan Pinnacle West Capital Corporation N 7 10/22/2019 N/A Y Aggregate value based on 8/06/26 stock price. Number of shares outstanding as of 7/28/26. The filing of this Form 144 shall not be construed as an admission that the undersigned is an Affiliate of the Issuer. 08/07/2026 /s/ Elizabeth A Blankenship