With a market cap of $29.7 billion, Atmos Energy Corporation (ATO) is one of the largest fully regulated natural-gas-only utility companies in the United States. Headquartered in Dallas, Texas, the company focuses primarily on the distribution, transmission, and storage of natural gas for residential, commercial, industrial, and public-sector customers.
Shares of this natural gas distributor have outperformed the broader market over the past year. ATO has gained 14.5% over this time frame, while the broader S&P 500 Index ($SPX) has rallied nearly 27.9%. In 2026, ATO stock is up 6.1%, trailing the SPX’s 9.2% rise on a YTD basis.
