Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in ATO held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 15.2M | $2.62B | -12.7% | 9.129% | 0.04% |
| 2 | STATE STREET CORP | 11.4M | $1.96B | +0.1% | 6.818% | 0.03% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 10.9M | $1.88B | +1.4% | 6.521% | 0.04% |
| 4 | VANGUARD PORTFOLIO MANAGEMENT LLC | 9.4M | $1.61B | +0.8% | 5.608% | 0.07% |
| 5 | WELLINGTON MANAGEMENT GROUP LLP | 9.2M | $1.58B | -4.8% | 5.503% | 0.27% |
| 6 | Capital International Investors | 7.5M | $1.29B | +2.1% | 4.483% | 0.27% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 4.5M | $770.3M | +3.5% | 2.689% | 0.04% |
| 8 | BANK OF AMERICA CORP /DE/ | 4.2M | $720.2M | -0.4% | 2.505% | 0.05% |
| 9 | Invesco Ltd. | 3.2M | $546.7M | +5.5% | 1.901% | 0.04% |
| 10 | MORGAN STANLEY | 2.9M | $493.3M | -4.6% | 1.716% | 0.03% |
| 11 | DEUTSCHE BANK AG\ | 2.5M | $431.7M | -1.6% | 1.501% | 0.13% |
| 12 | AQR CAPITAL MANAGEMENT LLC | 2.4M | $409.0M | +188.5% | 1.422% | 0.14% |
| 13 | GOLDMAN SACHS GROUP INC | 2.2M | $373.1M | +11.9% | 1.298% | 0.03% |
| 14 | Qube Research & Technologies Ltd | 2.1M | $368.1M | +2485.6% | 1.280% | 0.34% |
| 15 | NORGES BANK | 2.1M | $358.2M | — | 1.246% | 0.04% |
| 16 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 1.8M | $321.4M | +4.0% | 1.104% | 0.10% |
| 17 | Amundi | 1.8M | $314.2M | +40.0% | 1.093% | 0.08% |
| 18 | CITADEL ADVISORS LLC | 1.8M | $304.4M | +125.4% | 1.058% | 0.02% |
| 19 | Legal & General Group Plc | 1.6M | $276.6M | -0.7% | 0.962% | 0.06% |
| 20 | Capital Research Global Investors | 1.5M | $259.9M | -62.4% | 0.904% | 0.04% |
| 21 | DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt | 1.5M | $256.9M | +0.1% | 0.894% | 0.20% |
| 22 | NORTHERN TRUST CORP | 1.4M | $240.0M | -10.1% | 0.835% | 0.03% |
| 23 | Point72 Asset Management, L.P. | 1.4M | $234.5M | — | 0.816% | 0.26% |
| 24 | RAYMOND JAMES FINANCIAL INC | 1.3M | $219.0M | +5.4% | 0.762% | 0.06% |
| 25 | Pictet Asset Management Holding SA | 1.3M | $218.9M | +8.1% | 0.761% | 0.21% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in ATO — a direct measure of their conviction.
Filings activity in ATO during Q2 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 1,045 | +3.5% | 97.51% | +0.42 pp | $27.09B | 5.0% |
| Q1 2026 | 1,010 | +5.0% | 97.09% | 2.13 pp | $28.53B | +12% |
| Q4 2025 | 962 | +8.3% | 99.22% | 0.36 pp | $25.52B | +0.6% |
| Q3 2025 | 888 | +3.7% | 99.58% | 1.56 pp | $25.35B | +10% |
| Q2 2025 | 856 | +2.5% | 101.14% | +1.59 pp | $22.99B | +2.9% |
| Q1 2025 | 835 | +5.4% | 99.55% | +0.30 pp | $22.34B | +12% |
| Q4 2024 | 792 | +8.0% | 99.25% | +3.02 pp | $19.95B | +7.3% |
| Q3 2024 | 733 | — | 96.23% | — | $18.59B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying ATO stock.
Based on Q2 2026 13F filings, institutional ownership of Atmos Energy Corporation stands at 97.5%, held across 1,045 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of ATO, with approximately 15,237,564 shares worth $2.62B as of Q2 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of ATO, including CITADEL ADVISORS LLC, Point72 Asset Management, L.P..
Our composite Smart Money Score for ATO is 67 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
120 institutions opened new positions in ATO during Q2 2026, while 93 fully exited. 247 added to existing positions and 646 trimmed.
ATO institutional ownership rose by 0.42 percentage points quarter-over-quarter, with a net change of +35 holders.
The top 10 institutions account for 49.7% of all reported 13F value in ATO, and the top 25 account for 66.7%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Atmos Energy Corporation (ATO) Institutional Ownership