Pinnacle West Capital (PNW) Announces Proposed $650M Share Offering

Pinnacle West Capital Corp. (NYSE: PNW) (“Pinnacle West”) announced today that it is commencing a registered public offering of $650 million of its common stock in connection with the forward sale agreements described below, subject to market and other conditions.

Pinnacle West intends to grant the underwriters the option to purchase up to an additional $97.5 million of its common stock. If such option is exercised, Pinnacle West may, in its sole discretion, enter into additional forward sale agreements with the forward purchasers in respect of, in the aggregate, the number of additional shares of Pinnacle West’s common stock that are subject to the exercise of such option, and Pinnacle West currently anticipates that, if such option is exercised, it will do so.

Barclays, Citigroup, Mizuho and Wells Fargo Securities are acting as joint book-running managers for this offering. The underwriters may offer shares of Pinnacle West’s common stock in transactions on the New York Stock Exchange, in the over-the-counter market, through negotiated transactions or otherwise at market prices prevailing at the time of sale, at prices related to prevailing market prices or at negotiated prices.

In connection with the offering, Pinnacle West intends to enter into separate forward sale agreements with Mizuho Markets Americas LLC and Wells Fargo Bank, National Association (or their respective affiliates), referred to in such capacity as the forward purchasers, pursuant to which Pinnacle West will agree to sell shares of its common stock to the forward purchasers at an initial forward sale price per share equal to the price per share at which the underwriters purchase the shares in the offering, subject to certain adjustments. In connection with the forward sale agreements, the forward purchasers or their respective affiliates, acting as forward sellers, expect to borrow from third parties an aggregate of approximately $650 million of Pinnacle West’s common stock. Such borrowed shares of Pinnacle West’s common stock will be delivered by the forward sellers for sale to the underwriters in the offering. Settlement of each forward sale agreement is expected to occur no later than September 4, 2025. Although Pinnacle West expects to settle each forward sale agreement entirely by the full physical delivery of shares of its common stock in exchange for cash proceeds, Pinnacle West may, subject to certain conditions, elect cash settlement or net share settlement for all or a portion of its rights or obligations under the forward sale agreements.

Pinnacle West will not initially receive any proceeds from the sale of shares of its common stock by the forward sellers or their affiliates to the underwriters. If Pinnacle West elects physical settlement of the forward sale agreements, it expects to use any net proceeds received for investment in its principal subsidiary Arizona Public Service Company to fund capital expenditures and general corporate purposes.

This press release does not constitute an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of these securities, in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. The offering of these securities may be made only by means of a prospectus supplement and accompanying base prospectus relating to this offering.

The public offering is being made pursuant to an effective shelf registration statement that has been filed with the Securities and Exchange Commission (the “SEC”). A preliminary prospectus supplement related to the offering will be filed with the SEC and will be available on the SEC’s website. In addition, copies of the preliminary prospectus supplement and accompanying base prospectus relating to the shares of common stock being offered may be obtained by contacting: Barclays Capital Inc., c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, New York 11717, telephone: 1-888-603-5847 or by emailing [email protected]; Citigroup, c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, New York 11717, telephone: 1-800-831-9146; Mizuho Securities USA LLC, ATTN: Equity Capital Markets, 1271 Avenue of the Americas, 3rd Floor, New York, New York 10020, telephone: 1-212-205-7600 or by emailing [email protected]; Wells Fargo Securities, 90 South 7th Street, 5th Floor, Minneapolis, Minnesota 55402, telephone: 1-800-645-3751 or by emailing [email protected]; or by accessing the SEC’s website at www.sec.gov.

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