Pinnacle West Short Interest Climbs to Year High Before Earnings

Short sellers have built their largest position in PNW in at least a year, with 12.6 million shares now borrowed against the stock, equal to 10.6% of the free float. That figure has risen 27% over the past month, with the steepest acceleration coming in the second half of October. The put/call ratio reached 1.23 on October 30, its highest reading of the past 52 weeks and more than three standard deviations above its 20-day average of 0.37. Options positioning and short interest are pointing in the same direction.

The stock itself has not responded in kind. PNW closed at $106.28 on October 30, up 14% over the past month and roughly flat on the week. That is a noticeably softer weekly showing than the closest peer group: LNT gained 2.9% over the same five days, IDA rose 3.3%, and XEL added 2.3%. Borrow costs remain low at 0.54%, and availability at 218% means there is no shortage of shares to lend. The short position is large and growing, but it has not created any friction in the lending market.

The analyst debate is genuinely split. HSBC initiated coverage on October 22 with a Buy and a $119.50 target, one of the more constructive calls on the stock. The bull case centres on 5.2% retail sales growth and a 2.4% expansion in the customer base, alongside management's stated 4-6% long-term sales growth outlook. Morgan Stanley lifted its target by $2 to $91 on October 21 but remains at Equal-Weight, still well below the current price. Jefferies trimmed its target from $129 to $109 on October 5, keeping its Buy rating, while Barclays and Truist both cut targets without changing their neutral-to-hold stances. The consensus mean target is $104.97, fractionally below the current price, a compressed implied return that reflects the stock's recent run. Bears point to a roughly 10% year-on-year earnings decline driven by higher operating costs, and a rate case procedural announcement from Arizona Public Service that has shifted EPS expectations for 2026 and 2027 into negative territory.

The ORTEX Nuclear output dataset from the US Nuclear Regulatory Commission tracks daily reactor power output for Pinnacle West's nuclear units. As of October 13, reactor output registered a z-score of negative 10.0 against its own trailing history, consistent with a significant outage event. The dataset's lead status is untested against the company's financial results, so no connection to the earnings print can be drawn from it. It is operational colour, not a financial signal.

The November 3 report will test whether the strong retail sales trend and customer growth can offset the cost pressures and rate-case uncertainty that have kept most of the Street cautious even as the stock trades at a 52-week high.