Pinnacle West Capital Corporation and its subsidiary Arizona Public Service Company filed a combined quarterly report with the SEC on November 3, 2026, covering the three-month period ended September 30, 2026.

Key Highlights

  • Dual registrant filing: The report covers both Pinnacle West Capital Corporation and Arizona Public Service Company, each providing disclosures on its own behalf.
  • Pinnacle West shares outstanding: As of October 28, 2026, Pinnacle West had 121,201,207 shares of common stock, no par value, outstanding.
  • APS shares outstanding: As of October 28, 2026, Arizona Public Service Company had 71,264,947 shares of common stock, with a $2.50 par value, outstanding.
  • Large accelerated filer: Pinnacle West Capital Corporation is classified as a large accelerated filer; Arizona Public Service Company is classified as a non-accelerated filer.
  • Reduced disclosure format: APS filed under the reduced disclosure format permitted by General Instruction H(2) of the applicable quarterly reporting form, as it meets the conditions in General Instruction H(1)(a) and (b).
  • Key regulatory bodies: The filing identifies the Arizona Corporation Commission and the Federal Energy Regulatory Commission as among the primary regulators overseeing the companies' operations.

Pinnacle West and APS Operations and Regulatory Context in Q3 2026

Pinnacle West Capital Corporation, an Arizona corporation headquartered at 400 North Fifth Street, Phoenix, Arizona, is the parent of Arizona Public Service Company, the operating electric utility subsidiary. According to the filing, the combined quarterly report is provided separately by each registrant, with each company responsible for the disclosures relating to itself and, where required, its subsidiaries. The common stock of Pinnacle West Capital Corporation trades on the New York Stock Exchange under the symbol NYSE:PNW.

The filing notes that APS is subject to oversight from multiple regulatory bodies, including the Arizona Corporation Commission, the Federal Energy Regulatory Commission, the Nuclear Regulatory Commission, and the Environmental Protection Agency. The company's operations include the Palo Verde Generating Station, Four Corners Power Plant, Cholla Power Plant, Ocotillo Power Plant, and other generation assets identified in the filing's glossary. The filing references adjustor mechanisms such as the Power Supply Adjustor, Lost Fixed Cost Recovery Mechanism, and Transmission Cost Adjustor as part of the rate structure through which APS seeks recovery of its costs.

The filing contains forward-looking statements, which the company attributes to current expectations. Pinnacle West cautions, in the filing's own words, that "actual results may differ materially from expectations" and identifies numerous risk factors, including the ability to achieve timely rate recovery, impacts of federal and state regulatory changes, and liabilities associated with the operation of Palo Verde. These forward-looking statements are subject to the company's cautionary language contained in the filing.

What Was Disclosed

Pinnacle West Capital Corporation and Arizona Public Service Company jointly filed a quarterly report for the period ended September 30, 2026, disclosing share counts as of October 28, 2026, filer classifications, regulatory relationships, and operational assets, along with cautionary language regarding forward-looking statements.