As at Aug 21, 2026, the ATO stock has a PE ratio of 19.65. This is based on the current EPS of $8.49 and the stock price of $166.85 per share. A decrease of 10% has been recorded in the P/E ratio compared to the average of 21.7 of the last 4 quarters.
ATO PE ratio history
The mean historical PE ratio of Atmos Energy over the last ten years is 20.32. The current 19.65 PE ratio is 3.3% below the historical average. In the past ten years, ATO's PE ratio was at its highest in the Sep 2019 quarter at 26.12, with a price of $113.89 and an EPS of $4.36. The Mar 2018 quarter recorded the bottom point at 15.37, with a price of $84.24 and an EPS of $5.48.
Atmos Energy PE ratio by year
Maximum annual increase: 51.07% in 2019
Maximum annual decrease: -25.15% in 2020
| Year | PE ratio | PE change | Price | EPS |
|---|---|---|---|---|
| 2025 | 22.65 | 11.52% | $170.75 | $7.54 |
| 2024 | 20.31 | 16.93% | $138.71 | $6.83 |
| 2023 | 17.37 | -4.35% | $105.93 | $6.1 |
| 2022 | 18.16 | 5.4% | $101.85 | $5.61 |
| 2021 | 17.23 | -11.87% | $88.2 | $5.12 |
| 2020 | 19.55 | -25.15% | $95.59 | $4.89 |
| 2019 | 26.12 | 51.07% | $113.89 | $4.36 |
| 2018 | 17.29 | -23.09% | $93.91 | $5.43 |
| 2017 | 22.48 | 2.04% | $83.84 | $3.73 |
| 2016 | 22.03 | 16.99% | $74.47 | $3.38 |
| 2015 | 18.83 | 16.88% | $58.18 | $3.09 |
| 2014 | 16.11 | 1.38% | $47.7 | $2.96 |
| 2013 | 15.89 | 6.15% | $42.59 | $2.68 |
| 2012 | 14.97 | 5.2% | $35.79 | $2.39 |
| 2011 | 14.23 | 7.97% | $32.45 | $2.28 |
Atmos Energy PE ratio by quarter (TTM)
| Year | PE ratio | PE change | Price | EPS |
|---|---|---|---|---|
| Jun 2026 | 20.29 | -9.7% | $172.27 | $8.49 |
| Mar 2026 | 22.47 | 4.27% | $184.72 | $8.22 |
| Dec 2025 | 21.55 | -4.86% | $167.63 | $7.78 |
| Sep 2025 | 22.65 | 7.3% | $170.75 | $7.54 |
| Jun 2025 | 21.11 | -1.54% | $154.11 | $7.3 |
| Mar 2025 | 21.44 | 7.74% | $154.58 | $7.21 |
| Dec 2024 | 19.9 | -2.02% | $139.27 | $7 |
| Sep 2024 | 20.31 | 17.88% | $138.71 | $6.83 |
| Jun 2024 | 17.23 | -3.9% | $116.65 | $6.77 |
| Mar 2024 | 17.93 | -3.13% | $118.87 | $6.63 |
| Dec 2023 | 18.51 | 6.56% | $115.9 | $6.26 |
| Sep 2023 | 17.37 | -13.41% | $105.93 | $6.1 |
| Jun 2023 | 20.06 | 3.19% | $116.34 | $5.8 |
| Mar 2023 | 19.44 | -1.67% | $112.36 | $5.78 |
| Dec 2022 | 19.77 | 8.87% | $112.07 | $5.67 |
ATO Price vs fair value
ATO average PE ratio chart
What this chart measures
The Historical Valuation Regime chart shows where the stock's current valuation sits relative to its own historical valuation range over the selected lookback period.
This is a history-relative tool, not a market-relative percentile. It does not compare the stock to other companies. Instead, it compares each historical valuation reading to the stock's own past readings.
Percentile logic
The threshold lines are calculated them from the stock's real historical values using percentile interpolation. That is why some colored bands are narrow while others are wide: the band widths reflect how the stock actually traded through time.
Regime map
| Historical percentile | Regime | Chart meaning |
|---|---|---|
| 0-10 | Historically Low | Deep cheap zone |
| >10-25 | Below Average | Cheap relative to history |
| >25-75 | Average | Within the normal historical range |
| >75-90 | Above Average | Expensive relative to history |
| >90-100 | Historically High | Extreme or stretched valuation |
How to read each part
| Chart element | What it tells you |
|---|---|
| Main line | The actual historical valuation values over time for the selected metric. |
| Dashed horizontal lines | The stock's computed P10, P25, Median, P75, and P90 thresholds for the selected period. |
| Colored bands | The historical valuation zones between those thresholds. |
| Metric boxes | Current ratio, historical median, current percentile, and current regime. |
| Timeline strip | A condensed regime history showing how the stock moved between cheap, fair, and expensive states across each observation. |
Important metric definitions
Current Percentile is the percentile rank of the latest valid historical observation within the selected lookback range.
Current Regime is assigned directly from the latest observation's percentile bucket using the fixed 10 / 25 / 75 / 90 cutoffs shown above.
How to use it well
This chart is most useful for answering a narrow question: Is this stock trading high, low, or normal relative to its own history? It works best alongside growth, profitability, and forward-looking business analysis, because a stock can deserve a higher or lower regime if its business quality has changed.
The current PE ratio of ATO is lower than the 3, 5 and 10-year averages.
PE comparison
With a P/E of 19.65, ATO stands above the industry and its peers average but below the Utilities sector average. But compared to its Utilities sector average of 19.82, Atmos Energy's P/E is only 0.9% lower.
ATO PE vs peers
Frequently asked questions
What is Atmos Energy's PE ratio?
As of Aug 21, 2026, ATO stock has a price to earnings ratio of 19.65.
What is the 3-year average PE ratio for Atmos Energy (ATO)?
The 3-year average PE ratio for ATO stock is 20.06.
What is the 5-year average PE ratio for Atmos Energy (ATO)?
The 5-year average PE ratio for ATO stock is 19.91.
What is the highest PE ratio for ATO?
Over the last ten years, the quarterly PE ratio reached a historic high of 26.12 in the Sep 2019 quarter.
How does the current PE ratio for ATO compare to its historical average?
ATO's current price to earnings ratio is 3.3% below its 10-year historical average.
How is ATO's PE ratio calculated (Atmos Energy PE ratio formula)?
To determine the PE ratio, divide the most recent stock price by the TTM earnings per share (EPS). As of today (Aug 21, 2026), Atmos Energy's stock price is $166.85. The earnings per share for the trailing twelve months (TTM) ending Jun 2026 is $8.49. Therefore, Atmos Energy's P/E ratio for today is 19.65. PE RATIO(19.65) = STOCK PRICE($166.85) / TTM EPS($8.49)
All PE ratio stats are based on quarterly TTM periods, unless otherwise specified.