Market Cap for Atmos Energy (ATO)
According to Atmos Energy's latest reported financial statements, the company's latest reported market cap is $27.64B USD. Market capitalization is the total dollar value of all outstanding shares — shares outstanding × stock price — and the standard measure of a company's equity value. On this page, historical market cap snaps filing-period share counts to closing prices on or before each statement date (not intraday tick data).
Headline figure above is from the reporting period ending (reported ). Chart and table below cover the full reported history back to .
ATO
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Latest period
$27.64B
YoY change
+11.7%
5Y CAGR
+21.7%
Peak year (2026)
$30.62B
Latest annual
$30.62B
Market Cap history chart for Atmos Energy (ATO) from 1985 to 2026
Market Cap history table for Atmos Energy (ATO) from 1985 to 2026
| Fiscal year | Period ended | Reported | Market Cap | YoY |
|---|---|---|---|---|
| 2026 | $30.62B | +11.7% | ||
| 2025 | $27.42B | +29.5% | ||
| 2024 | $21.18B | +37.7% | ||
| 2023 | $15.38B | +9.3% | ||
| 2022 | $14.07B | +22.8% | ||
| 2021 | $11.45B | -2.5% | ||
| 2020 | $11.75B | -12.2% | ||
| 2019 | $13.38B | +28.3% | ||
| 2018 | $10.43B | +17.2% | ||
| 2017 | $8.90B | +15.4% | ||
| 2016 | $7.71B | +30.0% | ||
| 2015 | $5.93B | +27.3% | ||
| 2014 | $4.66B | +19.2% | ||
| 2013 | $3.91B | +19.7% | ||
| 2012 | $3.26B | +10.9% | ||
| 2011 | $2.94B | +8.8% | ||
| 2010 | $2.70B | +4.2% | ||
| 2009 | $2.59B | +7.9% | ||
| 2008 | $2.40B | -3.3% | ||
| 2007 | $2.48B | +6.9% | ||
| 2006 | $2.32B | +4.1% | ||
| 2005 | $2.23B | +62.8% | ||
| 2004 | $1.37B | +23.1% | ||
| 2003 | $1.11B | +25.5% | ||
| 2002 | $886.88M | +7.4% | ||
| 2001 | $826.14M | +26.7% | ||
| 2000 | $651.78M | -12.4% | ||
| 1999 | $743.66M | -13.3% | ||
| 1998 | $857.69M | +17.3% | ||
| 1997 | $731.04M | +97.2% | ||
| 1996 | $370.63M | +24.1% | ||
| 1995 | $298.71M | +10.8% | ||
| 1994 | $269.71M | +22.5% | ||
| 1993 | $220.12M | +43.1% | ||
| 1992 | $153.81M | +11.3% | ||
| 1991 | $138.25M | +33.8% | ||
| 1990 | $103.32M | +2.5% | ||
| 1989 | $100.84M | +34.5% | ||
| 1988 | $74.97M | +32.1% | ||
| 1987 | $56.76M | -8.7% | ||
| 1986 | $62.14M | +26.8% | ||
| 1985 | $49.00M | — |
Market Cap values are taken from Atmos Energy's reported income statements (10-Q quarterly and 10-K annual filings with the U.S. Securities and Exchange Commission). Each row shows the period end date and the date the filing was reported; YoY compares each figure to the same period one year earlier. Amounts are in USD as filed.
Analysis
As of the 2026 fiscal year, Atmos Energy (ATO) reported market cap of $30.62B – grew 11.7% year-over-year.
Atmos Energy market cap has grown for 5 consecutive years, with a +21.7% compound annual growth rate over 2021–2026 (5 years).
2026 marks the peak market cap at $30.62B, with the historical low of $49.00M recorded in 1985.
Among 8 Utilities peers, Atmos Energy (ATO) ranks 9th; the peer median for market cap is $97.46B.
Atmos Energy Market Cap by Year
Atmos Energy Market Cap 2026: $30.62B
Atmos Energy market cap in 2026 was $30.62B, grew 11.7% from 2025. This figure represents the highest annual value in the available history.
Atmos Energy Market Cap 2025: $27.42B
Atmos Energy market cap in 2025 was $27.42B, grew 29.5% from 2024.
Atmos Energy Market Cap 2024: $21.18B
Atmos Energy market cap in 2024 was $21.18B, surged 37.7% from 2023.
Atmos Energy Market Cap 2023: $15.38B
Atmos Energy market cap in 2023 was $15.38B, grew 9.3% from 2022.
Atmos Energy Market Cap 2022: $14.07B
Atmos Energy market cap in 2022 was $14.07B.
See more financial history for Atmos Energy (ATO).
Sector peers — Market Cap
Companies in the same sector as Atmos Energy, ranked by their latest market cap.
| Company | Market Cap | Sector |
|---|---|---|
| GE Vernova Inc. (GEV) | $292.62B | Utilities |
| NextEra Energy, Inc. (NEE) | $201.26B | Utilities |
| The Southern Company (SO) | $106.43B | Utilities |
| Duke Energy Corporation (DUK) | $99.46B | Utilities |
| Constellation Energy Corporation (CEG) | $95.47B | Utilities |
| American Electric Power Company, Inc. (AEP) | $73.70B | Utilities |
| Sempra (SRE) | $60.69B | Utilities |
| Dominion Energy, Inc. (D) | $55.28B | Utilities |
Frequently asked questions
What is Atmos Energy's market cap?
- Latest reported market cap for Atmos Energy (ATO) is $27.64B (period ending December 31, 2025).
How has Atmos Energy market cap changed year-over-year?
- Atmos Energy (ATO) market cap changed +11.7% year-over-year on the latest annual filing.
What is the long-term growth rate of Atmos Energy market cap?
- Atmos Energy (ATO) market cap compound annual growth rate is +21.7% over the most recent 5 years available.
When did Atmos Energy market cap hit its highest annual value?
- Atmos Energy market cap reached its highest annual value of $30.62B in 2026.
What was Atmos Energy market cap in 2025?
- Atmos Energy (ATO) market cap in 2025 was $27.42B.
What was Atmos Energy market cap in 2026?
- Atmos Energy (ATO) market cap in 2026 was $30.62B.
Metrics overview
Pick a metric for charts, filings, and peers — each row shows the latest TTM or annual value with year-over-year change.
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ATO Overview
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