ATO Institutional Ownership
Top institutional (13F) holders of ATO and 5%+ (13D/G) positions, sourced from SEC EDGAR.
Institutional owners
54
Institutional value
$18.28B
Top holder
BlackRock, Inc.
Top holders
| Holder | Stake | Filed | Value |
|---|---|---|---|
| BlackRock, Inc.holding company | 9.0% | Aug 7, 2026 | $2.62B |
| STATE STREET CORPORATIONholding company | 6.7% | Sep 22, 2026 | $1.96B |
| Vanguard Capital Managementinvestment advisor | 6.4% | Aug 13, 2026 | $1.88B |
| Vanguard Portfolio Managementinvestment advisor | 5.5% | Aug 13, 2026 | $1.61B |
| WELLINGTON MANAGEMENT GROUP LLPinvestment advisor | 5.4% | Aug 14, 2026 | $1.58B |
| Capital International Investorsinvestment advisor | 4.4% | Aug 12, 2026 | $1.29B |
| BANK OF AMERICA CORP /DE/holding company | 2.5% | Aug 14, 2026 | $720.21M |
| GEODE CAPITAL MANAGEMENT, LLCinvestment advisor | 2.7% | Nov 6, 2026 | $704.64M |
| Invesco Ltd.holding company | 1.9% | Aug 14, 2026 | $546.75M |
| MORGAN STANLEYholding company | 1.7% | Aug 13, 2026 | $493.33M |
| T. Rowe Price Associates, Inc.investment advisor | 1.5% | Aug 14, 2026 | $427.51M |
| AQR CAPITAL MANAGEMENT LLCinvestment advisor | 1.4% | Aug 14, 2026 | $408.95M |
| GOLDMAN SACHS GROUP INCinvestment advisor | 1.3% | Aug 14, 2026 | $373.1M |
| Norges Bankother | 1.2% | Aug 12, 2026 | $358.19M |
| Massachusetts Financial Services Companyinvestment advisor | 1.1% | Aug 3, 2026 | $321.41M |
| CITADEL ADVISORS LLCinvestment advisor | 1.0% | Sep 1, 2026 | $304.35M |
| Capital Research Global Investorsinvestment advisor | 0.9% | Aug 12, 2026 | $259.89M |
| NORTHERN TRUST CORPinvestment advisor | 0.8% | Aug 13, 2026 | $240.02M |
| Point72 Asset Management, L.P.investment advisor | 0.8% | Aug 14, 2026 | $234.49M |
| WELLS FARGO & COMPANY/MNinvestment advisor | 0.7% | Aug 14, 2026 | $207.47M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INCinvestment advisor | 0.6% | Aug 14, 2026 | $182.55M |
| Bank of New York Mellon Corpholding company | 0.5% | Nov 5, 2026 | $136.33M |
| UBS Group AGbank | 0.4% | Aug 13, 2026 | $122.84M |
| Dimensional Fund Advisors LPinvestment advisor | 0.5% | Nov 4, 2026 | $122.76M |
| FMR LLCinvestment advisor | 0.4% | Aug 13, 2026 | $113.77M |
5%+ holders
Current stakes of 5% or more from Schedule 13D and 13G filings. A joint filing shows once, under its lead filer.
| Holder | Form | Stake | Filed |
|---|---|---|---|
| BlackRock, Inc.holding company | SC 13G/A | 8.7% | Jul 27, 2026 |
| Vanguard Capital Managementinvestment advisor | SC 13G | 7.5% | Apr 29, 2026 |
| Vanguard Portfolio Managementinvestment advisor | SC 13G | 5.6% | Apr 28, 2026 |
| WELLINGTON MANAGEMENT GROUP LLPinvestment advisorwith Wellington Group Holdings LLP and 2 others | SC 13G/A | 5.5% | Aug 13, 2026 |
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Source: SEC EDGAR Schedule 13D / 13G and 13F filings.