Oak Thistle LLC Significantly Increases Pinnacle West Capital Holdings

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Oak Thistle LLC, an institutional investment firm, has significantly increased its holdings in Pinnacle West Capital Corporation (NYSE: PNW), the parent company of Arizona utility provider Arizona Public Service (APS). According to a recent 13F filing, Oak Thistle increased its stake in Pinnacle West by 251% during the fourth quarter, adding over 31,000 shares to bring its total position to 44,316 shares worth $3.93 million.

Why it matters

Pinnacle West Capital is one of the largest utility providers in Arizona, serving over 1 million residential, commercial, and industrial customers across the state. The substantial increase in Oak Thistle's position suggests the institutional investor sees significant upside potential in the company's stock, which could signal broader confidence in Pinnacle West's future performance and growth prospects.

The details

According to the 13F filing, Oak Thistle LLC increased its stake in Pinnacle West Capital from 12,626 shares at the end of the third quarter to 44,316 shares by the end of the fourth quarter, a 251% increase. The investment firm's total position in Pinnacle West is now valued at $3.93 million, making it the 12th largest holding in Oak Thistle's portfolio.

• Oak Thistle LLC filed its 13F report for the fourth quarter of 2025 on April 8, 2026.
• The firm increased its Pinnacle West Capital holdings during the fourth quarter of 2025.