Ranked by reported Q1 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. | 17.5M | $3.22B | +2.5% | 10.455% | 0.06% |
| 2 | STATE STREET CORP | 11.4M | $2.10B | +5.4% | 6.813% | 0.07% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 10.7M | $1.98B | β | 6.432% | 0.05% |
| 4 | WELLINGTON MANAGEMENT GROUP LLP | 9.7M | $1.78B | -3.6% | 5.782% | 0.33% |
| 5 | VANGUARD PORTFOLIO MANAGEMENT LLC | 9.3M | $1.72B | β | 5.563% | 0.09% |
| 6 | Capital International Investors | 7.3M | $1.35B | -38.4% | 4.389% | 0.32% |
| 7 | Aristotle Capital Management, LLC | 4.9M | $899.0M | -23.6% | 2.916% | 1.88% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 4.3M | $798.1M | +2.9% | 2.598% | 0.05% |
| 9 | BANK OF AMERICA CORP /DE/ | 4.2M | $775.7M | +11.0% | 2.516% | 0.06% |
| 10 | Capital Research Global Investors | 4.0M | $740.8M | β | 2.403% | 0.11% |
| 11 | Invesco Ltd. | 3.0M | $555.5M | -0.2% | 1.802% | 0.09% |
| 12 | MORGAN STANLEY | 3.0M | $554.4M | +8.9% | 1.798% | 0.03% |
| 13 | DEUTSCHE BANK AG\ | 2.5M | $470.5M | -11.8% | 1.526% | 0.16% |
| 14 | GOLDMAN SACHS GROUP INC | 1.9M | $357.5M | +55.3% | 1.159% | 0.04% |
| 15 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 1.8M | $331.4M | -10.3% | 1.062% | 0.11% |
| 16 | Legal & General Group Plc | 1.6M | $298.6M | +2.3% | 0.968% | 0.07% |
| 17 | NORTHERN TRUST CORP | 1.5M | $286.3M | +2.5% | 0.928% | 0.04% |
| 18 | DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt | 1.5M | $275.4M | +17.6% | 0.893% | 0.27% |
| 19 | WELLS FARGO & COMPANY/MN | 1.3M | $245.6M | -1.5% | 0.796% | 0.05% |
| 20 | Amundi | 1.3M | $240.7M | +49.6% | 0.781% | 0.07% |
| 21 | Perpetual Ltd | 1.2M | $229.1M | -11.3% | 0.743% | 3.51% |
| 22 | RAYMOND JAMES FINANCIAL INC | 1.2M | $222.9M | +8.6% | 0.723% | 0.07% |
| 23 | Pictet Asset Management Holding SA | 1.2M | $217.1M | +10.9% | 0.704% | 0.23% |
| 24 | UBS ASSET MANAGEMENT AMERICAS INC | 1.1M | $196.5M | +3.3% | 0.637% | 0.04% |
| 25 | SFMG, LLC | 1.1M | $195.5M | -0.2% | 0.634% | 13.24% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in ATO β a direct measure of their conviction.
Filings activity in ATO during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new ATO position in Q1 2026
Institutions that fully closed their ATO position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 1,000 | +4.0% | 99.99% | +10.05 pp | $28.37B | +11% |
| Q4 2025 | 962 | +8.7% | 89.94% | +0.61 pp | $25.52B | +0.7% |
| Q3 2025 | 885 | +3.4% | 89.33% | +8.29 pp | $25.34B | +10% |
| Q2 2025 | 856 | +2.5% | 81.04% | +2.30 pp | $22.99B | +2.9% |
| Q1 2025 | 835 | +5.4% | 78.74% | +8.42 pp | $22.34B | +12% |
| Q4 2024 | 792 | +8.0% | 70.32% | +4.80 pp | $19.95B | +7.3% |
| Q3 2024 | 733 | +2.4% | 65.52% | +9.09 pp | $18.59B | +16% |
| Q2 2024 | 716 | β | 56.43% | β | $16.01B | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying ATO stock.
Based on Q1 2026 13F filings, institutional ownership of Atmos Energy Corporation stands at 100.0%, held across 1,000 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of ATO, with approximately 17,451,963 shares worth $3.22B as of Q1 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of ATO.
Our composite Smart Money Score for ATO is 53 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
151 institutions opened new positions in ATO during Q1 2026, while 113 fully exited. 685 added to existing positions and 156 trimmed.
ATO institutional ownership rose by 10.05 percentage points quarter-over-quarter, with a net change of +38 holders.
The top 10 institutions account for 54.2% of all reported 13F value in ATO, and the top 25 account for 70.7%.
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