PNW Historical PE Ratio Notes

— Pinnacle West Capital Corporation (ticker symbol: PNW) is a holding company primarily engaged in the regulated electricity utility business through its main subsidiary, Arizona Public Service (APS). APS is the largest electric utility in Arizona, serving about 1.3 million customers by generating, transmitting, & distributing electricity—much of it from a mix of natural gas, nuclear, & renewable sources. As a regulated utility, PNW’s revenues & earnings are largely determined by rates set by state regulators, which stabilizes profits despite fluctuating market conditions. This industry structure means that PNW historically trades at price-to-earnings (PE) ratios reflecting stable but slow-growing earnings, with swings in the historical PE ratio often linked to changes in interest rates, regulatory outlook, or investor appetite for utility sector stability versus growth. When reviewing PNW’s historical PE ratios, consider how earnings have moved in response to regulatory decisions, fuel costs, & regional population growth impacting electricity demand. Utilities like PNW tend to have lower earnings volatility & pay relatively steady dividends, which can result in PE ratios that at times appear elevated during periods of depressed or lagging earnings, yet are generally more stable compared to companies in cyclical sectors.

On this page we presented the PNW Historical PE Ratio information for Pinnacle West Capital' stock. The average PNW historical PE based on using the annualized quarterly earnings result at each measurement period (for the "E" in the PE calculation; and the closing price on earnings date as the "P") is 56.3. Meanwhile, using the trailing twelve month (TTM) quarterly earnings result as our method of calculation the "E" value at each measurement period, the average PNW historical PE based on this TTM earnings result method is 17.6. Note: any PE calculations resulting in a value exceeding 500 were discarded as not meaningful. Note: any PE calculations involving negative earnings were discarded as not meaningful.

Let's now compare this PNW historical PE result, against the recent PE: when this page was posted on 8/5/2026, the most recent closing price for PNW had been 101.50, and the most recent quarterly earnings result, annualized, was 5.72. Meanwhile, the most recent TTM earnings summed to 5.22. From these numbers, we calculate the recent PNW PE on 8/5/2026 based on annualized quarterly EPS was 17.7. Based on PNW's history, that recent PE is low relative to the historical average, with the recent PE 68.6% lower than the historical average PE across our data set for Pinnacle West Capital. Looking at the recent PNW PE on 8/5/2026 based on TTM EPS, we calculate the ratio at 19.4. Based on PNW's history, that recent PE is elevated relative to the historical average, with the recent PE 10.2% higher than the historical average PE across our Pinnacle West Capital data set with TTM EPS used in the calculation at each period.

Another interesting PNW historical PE Ratio calculation we look at is to take the median earnings per share of the last four quarters for PNW, and then annualize the resulting value... with that annualized number then being used in the PE calculation. To walk through this math for PNW, we start with the past four EPS numbers and we first sort them from lowest to highest: 0.13, 0.27, 1.43, and 3.39. We then toss out the highest and lowest result, and then take the average of those two middle numbers — 0.27 and 1.43 — which gives us the median of 0.85. Basically the way to think about this 0.85 number is this: for the trailing four earnings reports, 0.85 marks the "middle ground" number where PNW has reported a value higher than 0.85 half the time, and has reported a value lower than 0.85 half the time. Annualizing that median value then gets us to 3.4/share, which we use as the denominator in our next PE calculation. With 101.50 as the numerator (as of 8/5/2026), the calculation is then 101.50 / 3.4 = 29.9 as the PNW PE ratio as of 8/5/2026, based on that annualized median value we calculated.

For self directed investors doing their due diligence on PNW or any other given stock, valuation analysis for PNW can greatly benefit from studying the past earnings and resulting PE calculations. This exercise can help inform an analysis as to whether the past earnings trajectory and current versus historical PE ratios justify the current stock value.

That's why we bring you HistoricalPERatio.com to make it easy for investors to investigate Pinnacle West Capital PE history or the past PE information for any stock in our coverage universe. And in your continued research we hope you will be sure to check out the further links included for earnings surprises history (beat/miss data) as well as next earnings dates for PNW. Thanks for visiting, and the next time you need to research PNW Historical PE Ratio or the ratio for another stock, we hope you'll think of our site, as your go-to historical PE ratio research resource of choice.