Pinnacle West Capital Corporation filed a combined Form 8-K on November 3, 2026, disclosing financial results for the fiscal quarter ended September 30, 2026, along with a slide presentation covering third-quarter operating results and full-year 2026 earnings outlook.

Key Highlights

  • Filing date: November 3, 2026, covering the fiscal quarter ended September 30, 2026.
  • Co-registrants: Both Pinnacle West Capital Corporation (NYSE:PNW) and its subsidiary Arizona Public Service Company filed this report jointly, each on its own behalf.
  • Earnings release: A press release containing financial results was attached as Exhibit 99.1, issued November 3, 2026.
  • Slide presentation: A third-quarter 2026 results slide presentation, including a 2026 earnings outlook, was attached as Exhibit 99.2 and presented during a quarterly earnings conference call on November 3, 2026.
  • Signed by: Andrew Cooper, Senior Vice President and Chief Financial Officer, signed on behalf of both registrants.
  • Items reported: Item 2.02 (Results of Operations and Financial Condition) and Item 7.01 (Regulation FD Disclosure) were both invoked, meaning the financial information is furnished, not filed, under SEC rules.

Pinnacle West and Arizona Public Service Disclose Third-Quarter 2026 Financial Results

According to the filing, Pinnacle West Capital Corporation, an Arizona corporation headquartered at 400 North Fifth Street in Phoenix, Arizona, submitted a combined Form 8-K on November 3, 2026. Arizona Public Service Company, also an Arizona corporation sharing the same principal offices, is a co-registrant on the same report. The filing states that each registrant is filing or furnishing the information solely on its own behalf and "makes no representation" as to information that does not relate to it.

The disclosure was made under two items. Under Item 2.02, Pinnacle West issued a press release on November 3, 2026, reporting financial results for the fiscal quarter ended September 30, 2026. Under Item 7.01, the company provided a slide presentation used during a quarterly earnings conference call held on the same date. That presentation, according to the filing, covers Pinnacle West operating results for the fiscal quarter ended September 30, 2026, as well as an earnings outlook for the full year 2026.

Because both items are furnished rather than filed, the exhibits fall outside the scope of liability under Section 18 of the Securities Exchange Act of 1934 unless the registrant specifically incorporates them by reference. Pinnacle West Capital Corporation's common stock, which carries no par value, trades on the New York Stock Exchange under the ticker symbol PNW, as stated on the filing's cover page. Andrew Cooper, identified as Senior Vice President and Chief Financial Officer, signed the report on behalf of both registrants as of November 3, 2026.

What Was Disclosed

Pinnacle West Capital Corporation and Arizona Public Service Company jointly filed an 8-K on November 3, 2026, furnishing a third-quarter 2026 earnings press release and a conference call slide presentation that also included a 2026 full-year earnings outlook. Both documents were filed as exhibits.