Atmos Energy (ATO) Market Capitalization (2010 - 2026)
Atmos Energy (ATO) posted Market Capitalization of $29.11 billion for fiscal Q3 2026 (quarter ended Jun 30, 2026), up 17.7% from $24.74 billion a year earlier but down 5.6% from the prior quarter.
Powered by 
Analysis
Atmos Energy (ATO) Market Capitalization (2010 - 2026) Analysis & Trends
For FY2025 (ended Sep 30, 2025), Atmos Energy's Market Capitalization came in at $27.59 billion, up 28.1% from FY2024.
- Annual Market Capitalization has increased for four consecutive fiscal years, with a five-year compound annual growth rate of 18.1% (FY2020 to FY2025).
- In prior fiscal years, Atmos Energy's Market Capitalization was $21.54 billion in FY2024 (+36.9%), $15.73 billion in FY2023 (+9.6%), $14.35 billion in FY2022 (+22.9%) and $11.68 billion in FY2021 (-2.9%).
- Quarterly Market Capitalization has run from a low of $11.68 billion in fiscal Q4 2021 to a high of $30.83 billion in fiscal Q2 2026 over five years.
- On a year-over-year basis, Market Capitalization has increased in each of the last 13 quarters, with growth averaging 29.2% over the last eight quarters.
- The strongest year-over-year quarter for Market Capitalization in the past five years was fiscal Q4 2024, with growth of 36.9%; the weakest was fiscal Q4 2021, with a decline of 2.9%.
- According to Business Quant data, Market Capitalization for the three prior fiscal quarters was $30.83 billion (Q2 2026), $27.73 billion (Q1 2026) and $27.59 billion (Q4 2025).
Peer Set
Peer Comparison
| # | Company | Market Cap | Enterprise Value | Gross Profit (Qtr) |
|---|---|---|---|---|
| 1 | Enel Chile | 293.96 Bn | 293.96 Bn | 890.00 Mn |
| 2 | National Grid | 78.23 Bn | 59.76 Bn | - |
| 3 | Dominion Energy | 53.03 Bn | 55.71 Bn | - |
| 4 | Xcel Energy | 43.33 Bn | 38.23 Bn | - |
| 5 | Wec Energy | 33.06 Bn | 33.29 Bn | 1.51 Bn |
| 6 | Ameren | 27.51 Bn | 27.60 Bn | - |
| 7 | Fortis | 26.94 Bn | 27.43 Bn | 1.60 Bn |
| 8 | Atmos Energy | 26.53 Bn | 25.30 Bn | 870.85 Mn |
| 9 | American Water Works Company | 25.62 Bn | 25.03 Bn | - |
| 10 | Dte Energy | 25.14 Bn | 24.62 Bn | - |
Historic Data
Download Data
Historic Data
| Date | Value |
|---|---|
| Jun 30, 2026 | 29.11 Bn |
| Mar 31, 2026 | 30.83 Bn |
| Dec 31, 2025 | 27.73 Bn |
| Sep 30, 2025 | 27.59 Bn |
| Jun 30, 2025 | 24.74 Bn |
| Mar 31, 2025 | 24.55 Bn |
| Dec 31, 2024 | 22.11 Bn |
| Sep 30, 2024 | 21.54 Bn |
| Jun 30, 2024 | 18.11 Bn |
| Mar 31, 2024 | 17.93 Bn |
| Dec 31, 2023 | 17.48 Bn |
| Sep 30, 2023 | 15.73 Bn |
| Jun 30, 2023 | 17.14 Bn |
| Mar 31, 2023 | 16.23 Bn |
| Dec 31, 2022 | 16.04 Bn |
| Sep 30, 2022 | 14.35 Bn |
| Jun 30, 2022 | 15.68 Bn |
| Mar 31, 2022 | 16.61 Bn |
| Dec 31, 2021 | 14.19 Bn |
| Sep 30, 2021 | 11.68 Bn |
API Access
Atmos Energy Market Capitalization API
Pull this series into your own models, spreadsheets and apps with the Business Quant
Historical Metrics API. The request below matches the chart above — change the
frequency, period or values and it follows. Swap YOUR_API_KEY for your own key.
https://data.businessquant.com/historic?slug=market-capitalization&ticker=ATO&period=max&api_key=YOUR_API_KEYimport requests
url = "https://data.businessquant.com/historic"
params = {"slug": "market-capitalization", "ticker": "ATO", "period": "max", "api_key": "YOUR_API_KEY"}
data = requests.get(url, params=params).json()const res = await fetch("https://data.businessquant.com/historic?slug=market-capitalization&ticker=ATO&period=max&api_key=YOUR_API_KEY");
const data = await res.json();