Atmos Energy (ATO) Market Cap 1985–2026

As of October 29, 2026, Atmos Energy had a market cap of $28.91 billion, which increased by 0.91% compared to the previous trading day. Market capitalization, often referred to as market cap, represents the total value of a company's outstanding shares on the stock market and is a common measure of its overall size and valuation.

Data updated: Oct 29, 2026, 4:00 PM ET
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Atmos Energy Corp. (ATO)

🌍 United States 📈 NYSE 🏭 Utilities 🏢 Gas Utilities
Latest Market Cap
$28.91B ▲ 0.91%
Start of 2026
$27.11B ▲ 6.64%
1 Year Ago
$27.83B ▲ 3.88%
All-Time High
$31.84B ▼ 9.20%


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Note: Each point on the chart represents the market capitalization at the end of the trading day.
Source: Data compiled from EDGAR filings, Bloomberg and Yahoo Finance.

📈 Atmos Energy Market Cap History by Year and Month

Atmos Energy Market Cap History by Year and Month
Year / MonthMarket Cap% Change
2026$28.91B▲ 6.64%
$28.91B▲ 9.34%
$26.44B▼ 5.81%
$28.07B▼ 2.67%
$28.84B▲ 0.28%
$28.76B▲ 1.88%
$28.23B▼ 10.18%
$31.43B▲ 2.85%
$30.56B▼ 1.10%
$30.9B▲ 14.83%
$26.91B▼ 0.74%
2025$27.11B▲ 22.64%
2024$22.106B▲ 26.46%
2023$17.481B▲ 10.61%
2022$15.804B▲ 11.38%
All market cap values reflect closing prices for the period shown.

📊 Atmos Energy Market Cap and Other Industry Peers

Below are selected companies from the Utilities sector / subsector:

  1. $37.35B
  2. $36.67B
  3. $30.51B
  4. $29.14B
  5. $28.91B
  6. $28.26B
  7. $27.99B
  8. $27.98B
  9. $27.1B
  10. $26.81B
  11. $25.57B
  12. $22.85B
  13. $21.8B
  14. $21.46B
  15. $20.51B
  16. $8.29B
  17. $7.54B
  18. $6.75B
  19. $5.11B
  20. $4.15B


Data reflect the most recent market capitalization values available.

Note: Market capitalization figures are based on available sources and may differ slightly from actual values, particularly for historical data.