Atmos Energy ATO Institutional Ownership

Ownership Summary

Atmos Energy Corp (NYSE:ATO) has 1,004 institutional investors that have filed 13F reports for the period ending March 2026.

• Collectively, these holders controlled 95.6% of Atmos Energy's outstanding shares in March 2026, down from 97.4% in December 2025.
• They increased total shares held in ATO by 18.91% quarter over quarter, and investors in Atmos Energy increased 16.2% from a year ago.
• During the quarter, 541 of these 1,004 funds increased positions in ATO, 304 reduced exposure, and 159 held steady.
• Combined, these investors held 159.14Mn shares in ATO for March 2026, up by 25.31Mn shares quarter on quarter, and down 4.42Mn shares year over year.
• BlackRock, Inc. holds the largest position in ATO at 17.45Mn shares as of March 31, 2026, or 10.48% of shares outstanding.
• The largest buyers of Atmos Energy for the quarter ending March 2026 were VANGUARD CAPITAL MANAGEMENT LLC (10.74Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (9.29Mn), Capital Research Global Investors (4.01Mn), PRICE T ROWE ASSOCIATES INC /MD/ (2.72Mn), VANGUARD FIDUCIARY TRUST CO (930.64K).
• Leading sellers of Atmos Energy shares for the quarter ending March 2026 were Capital International Investors (4.57Mn), Aristotle Capital Management, LLC (1.5Mn), NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO (1.03Mn), HSBC HOLDINGS PLC (852.99K), COOKE & BIELER LP (637.7K).
• Per Business Quant, the top 10 investors in ATO for the quarter ending March 2026 include BlackRock, Inc. (17.45Mn), State Street Corp (11.37Mn), VANGUARD CAPITAL MANAGEMENT LLC (10.74Mn), WELLINGTON MANAGEMENT GROUP LLP (9.65Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (9.29Mn), Capital International Investors (7.33Mn), Aristotle Capital Management, LLC (4.87Mn), GEODE CAPITAL MANAGEMENT, LLC (4.34Mn), Bank Of America Corp /De/ (4.2Mn), Capital Research Global Investors (4.01Mn).