NI Historical PE Ratio Notes

— NiSource, Inc. (NYSE: NI) is a regulated utility company focused on natural gas and electric service, serving approximately 3.3 million customers across seven Midwestern & Northeastern states in the U.S. The company's business model centers on the transmission, distribution, and storage of natural gas as well as the generation and distribution of electricity. As a regulated utility, NiSource operates with relatively stable and predictable revenues, since rates are set through regulatory processes rather than market forces. This stability often results in lower stock price volatility and, historically, price-to-earnings (PE) ratios that are lower than high-growth sectors, but higher than sectors considered to have more risk or uncertainty in their earnings. When studying historical PE ratio charts for NI, it’s important to recognize that these ratios reflect both the predictability of NiSource’s income & the impact of interest rates, regulatory changes, and broader market sentiment toward utility stocks. Periods of economic downturn or unusually low interest rates can sometimes drive higher PE ratios, while regulatory headwinds or rising rates can bring them down. Understanding NI’s fundamentally stable business helps contextualize trends in these historical metrics.

On this page we presented the NI Historical PE Ratio information for NiSource' stock. The average NI 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 33.6. Meanwhile, using the trailing twelve month (TTM) quarterly earnings result as our method of calculation the "E" value at each measurement period, the average NI historical PE based on this TTM earnings result method is 17.9.

Let's now compare this NI historical PE result, against the recent PE: when this page was posted on 8/7/2026, the most recent closing price for NI had been 42.61, and the most recent quarterly earnings result, annualized, was 0.64. Meanwhile, the most recent TTM earnings summed to 1.92. From these numbers, we calculate the recent NI PE on 8/7/2026 based on annualized quarterly EPS was 66.6. Based on NI's history, that recent PE is elevated relative to the historical average, with the recent PE 98.2% higher than the historical average PE across our data set for NiSource. Looking at the recent NI PE on 8/7/2026 based on TTM EPS, we calculate the ratio at 22.2. Based on NI's history, that recent PE is elevated relative to the historical average, with the recent PE 24.0% higher than the historical average PE across our NiSource data set with TTM EPS used in the calculation at each period.

Another interesting NI historical PE Ratio calculation we look at is to take the median earnings per share of the last four quarters for NI, and then annualize the resulting value... with that annualized number then being used in the PE calculation. To walk through this math for NI, we start with the past four EPS numbers and we first sort them from lowest to highest: 0.16, 0.19, 0.51, and 1.06. We then toss out the highest and lowest result, and then take the average of those two middle numbers — 0.19 and 0.51 — which gives us the median of 0.35. Basically the way to think about this 0.35 number is this: for the trailing four earnings reports, 0.35 marks the "middle ground" number where NI has reported a value higher than 0.35 half the time, and has reported a value lower than 0.35 half the time. Annualizing that median value then gets us to 1.4/share, which we use as the denominator in our next PE calculation. With 42.61 as the numerator (as of 8/7/2026), the calculation is then 42.61 / 1.4 = 30.4 as the NI PE ratio as of 8/7/2026, based on that annualized median value we calculated.

For self directed investors doing their due diligence on NI or any other given stock, valuation analysis for NI 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 NiSource 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 NI. Thanks for visiting, and the next time you need to research NI 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.