Who owns Atmos Energy (ATO)
Which tracked institutional funds hold ATO, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ATO company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
175 tracked funds added or opened ATO while 276 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
ATO’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 0.0pp gap the other way — the median holder sizes ATO more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in ATO divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 985 tracked filers holding ATO, 523 increased or opened the position and 487 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in ATO between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 61
- Point72 Asset Management, L.P.$234M
- ONTARIO TEACHERS PENSION PLAN BOARD$101M
- ADAGE CAPITAL PARTNERS GP, L.L.C.$26M
- MARSHALL WACE, LLP$24M
- D. E. Shaw & Co., Inc.$22M
- Engineers Gate Manager LP$13M
Full exits 63
- Amundi$241M
- COHEN & STEERS, INC.$148M
- T. Rowe Price Investment Management, Inc.$66M
- KBC Group NV$58M
- Pacer Advisors, Inc.$48M
- CANADA LIFE ASSURANCE Co$35M
Largest adds
- Qube Research & Technologies Ltd$353M
- AQR CAPITAL MANAGEMENT LLC$258M
- CITADEL ADVISORS LLC$160M
- NORGES BANK$137M
- FMR LLC$95M
- JANE STREET GROUP, LLC$66M
Largest trims
- Aristotle Capital Management, LLC$893M
- Capital Research Global Investors$481M
- WELLINGTON MANAGEMENT GROUP LLP$200M
- STATE STREET CORP$140M
- VANGUARD CAPITAL MANAGEMENT LLC$108M
- VANGUARD PORTFOLIO MANAGEMENT LLC$103M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 15,237,564 | $2.6B | 10.7% | 2026-Q2 |
| STATE STREET CORP added | 11,380,060 | $2.0B | 8.0% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 10,885,153 | $1.9B | 7.7% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 9,360,135 | $1.6B | 6.6% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 9,185,788 | $1.6B | 6.5% | 2026-Q2 |
| Capital International Investors added | 7,483,012 | $1.3B | 5.3% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 4,489,277 | $770M | 3.2% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 4,180,718 | $720M | 2.9% | 2026-Q2 |
| Invesco Ltd. added | 3,173,775 | $547M | 2.2% | 2026-Q2 |
| MORGAN STANLEY trimmed | 2,863,719 | $493M | 2.0% | 2026-Q2 |
| DEUTSCHE BANK AG\ trimmed | 2,505,816 | $432M | 1.8% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 2,481,649 | $428M | 1.8% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 2,373,903 | $409M | 1.7% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 2,165,784 | $373M | 1.5% | 2026-Q2 |
| Qube Research & Technologies Ltd added | 2,136,532 | $368M | 1.5% | 2026-Q2 |
| NORGES BANK added | 2,079,227 | $358M | 1.5% | 2026-Q2 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ added | 1,842,583 | $321M | 1.3% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 1,736,405 | $299M | 1.2% | 2026-Q2 |
| Legal & General Group Plc trimmed | 1,605,373 | $277M | 1.1% | 2026-Q2 |
| Capital Research Global Investors trimmed | 1,508,563 | $260M | 1.1% | 2026-Q2 |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main added | 1,491,483 | $257M | 1.1% | 2026-Q2 |
| NORTHERN TRUST CORP trimmed | 1,393,267 | $240M | 1.0% | 2026-Q2 |
| Point72 Asset Management, L.P. new | 1,361,162 | $234M | 1.0% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 1,271,473 | $219M | 0.9% | 2026-Q2 |
| Pictet Asset Management Holding SA added | 1,270,400 | $219M | 0.9% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN trimmed | 1,204,326 | $207M | 0.8% | 2026-Q2 |
| GQG Partners LLC added | 1,175,136 | $202M | 0.8% | 2026-Q2 |
| Perpetual Ltd trimmed | 1,133,323 | $195M | 0.8% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 1,098,374 | $189M | 0.8% | 2026-Q2 |
| SFMG, LLC added | 1,060,369 | $183M | 0.7% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 1,059,660 | $183M | 0.7% | 2026-Q2 |
| CBRE INVESTMENT MANAGEMENT LISTED REAL ASSETS LLC added | 999,550 | $172M | 0.7% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC trimmed | 998,021 | $172M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 936,822 | $161M | 0.7% | 2026-Q2 |
| ProShare Advisors LLC trimmed | 924,825 | $159M | 0.7% | 2026-Q2 |
| Nuveen, LLC trimmed | 896,066 | $154M | 0.6% | 2026-Q2 |
| PNC Financial Services Group, Inc. trimmed | 884,648 | $152M | 0.6% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 877,494 | $151M | 0.6% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 768,834 | $132M | 0.5% | 2026-Q2 |
| UBS Group AG trimmed | 713,094 | $123M | 0.5% | 2026-Q2 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC trimmed | 682,414 | $118M | 0.5% | 2026-Q2 |
| HSBC HOLDINGS PLC trimmed | 672,843 | $116M | 0.5% | 2026-Q2 |
| FMR LLC added | 660,432 | $114M | 0.5% | 2026-Q2 |
| DUFF & PHELPS INVESTMENT MANAGEMENT CO added | 637,725 | $110M | 0.4% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC added | 627,569 | $108M | 0.4% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 608,876 | $105M | 0.4% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC trimmed | 603,994 | $104M | 0.4% | 2026-Q2 |
| ONTARIO TEACHERS PENSION PLAN BOARD new | 586,175 | $101M | 0.4% | 2026-Q2 |
| PFA Pension, Forsikringsaktieselskab trimmed | 565,963 | $97M | 0.4% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 560,812 | $98M | 0.4% | 2026-Q2 |
| Chevy Chase Trust Holdings, LLC added | 521,671 | $90M | 0.4% | 2026-Q2 |
| Nilsine Partners, LLC trimmed | 485,268 | $84M | 0.3% | 2026-Q2 |
| HUNTINGTON NATIONAL BANK added | 476,123 | $82M | 0.3% | 2026-Q2 |
| Swiss National Bank trimmed | 466,600 | $80M | 0.3% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 447,900 | $77M | 0.3% | 2026-Q2 |
| Clark Capital Management Group, Inc. added | 435,310 | $75M | 0.3% | 2026-Q2 |
| EARNEST PARTNERS LLC added | 429,513 | $74M | 0.3% | 2026-Q2 |
| Mitsubishi UFJ Asset Management Co., Ltd. added | 428,952 | $74M | 0.3% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC trimmed | 427,047 | $74M | 0.3% | 2026-Q2 |
| Energy Income Partners, LLC added | 410,650 | $71M | 0.3% | 2026-Q2 |
| Sumitomo Mitsui Trust Group, Inc. added | 401,601 | $69M | 0.3% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 396,719 | $68M | 0.3% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 387,012 | $67M | 0.3% | 2026-Q2 |
| AVIVA PLC trimmed | 381,486 | $66M | 0.3% | 2026-Q2 |
| Vanguard Global Advisers, LLC trimmed | 359,072 | $62M | 0.3% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 351,786 | $61M | 0.2% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 344,472 | $59M | 0.2% | 2026-Q2 |
| BENJAMIN EDWARDS INC added | 341,125 | $59M | 0.2% | 2026-Q2 |
| JENNISON ASSOCIATES LLC trimmed | 337,122 | $58M | 0.2% | 2026-Q2 |
| FIRST TRUST ADVISORS LP trimmed | 330,298 | $57M | 0.2% | 2026-Q2 |
| Capital International, Inc./CA/ trimmed | 316,825 | $55M | 0.2% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND trimmed | 291,757 | $50M | 0.2% | 2026-Q2 |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS trimmed | 288,789 | $50M | 0.2% | 2026-Q2 |
| Boston Trust Walden Corp trimmed | 281,447 | $48M | 0.2% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 272,772 | $47M | 0.2% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT CO LTD trimmed | 272,224 | $47M | 0.2% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 270,808 | $47M | 0.2% | 2026-Q2 |
| Quantinno Capital Management LP added | 268,788 | $46M | 0.2% | 2026-Q2 |
| Vest Financial, LLC trimmed | 265,448 | $46M | 0.2% | 2026-Q2 |
| BARCLAYS PLC trimmed | 260,209 | $45M | 0.2% | 2026-Q2 |
| ROYAL LONDON ASSET MANAGEMENT LTD trimmed | 254,611 | $44M | 0.2% | 2026-Q2 |
| Clearbridge Investments, LLC added | 254,286 | $44M | 0.2% | 2026-Q2 |
| Munich Reinsurance Co Stock Corp in Munich | 251,761 | $43M | 0.2% | 2026-Q2 |
| National Pension Service added | 250,465 | $43M | 0.2% | 2026-Q2 |
| Aberdeen Group plc added | 241,629 | $42M | 0.2% | 2026-Q2 |
| PANAGORA ASSET MANAGEMENT INC added | 237,071 | $41M | 0.2% | 2026-Q2 |
| Bahl & Gaynor LLC trimmed | 236,682 | $41M | 0.2% | 2026-Q2 |
| STIFEL FINANCIAL CORP added | 235,331 | $41M | 0.2% | 2026-Q2 |
| Partners Group Holding AG trimmed | 230,844 | $40M | 0.2% | 2026-Q2 |
| CITIGROUP INC trimmed | 214,158 | $37M | 0.2% | 2026-Q2 |
| EXCHANGE TRADED CONCEPTS, LLC added | 210,342 | $36M | 0.1% | 2026-Q2 |
| California Public Employees Retirement System trimmed | 209,558 | $36M | 0.1% | 2026-Q2 |
| M&G PLC added | 206,179 | $35M | 0.1% | 2026-Q2 |
| LPL Financial LLC added | 206,138 | $36M | 0.1% | 2026-Q2 |
| Aventail Capital Group, LP trimmed | 202,896 | $35M | 0.1% | 2026-Q2 |
| BANK OF MONTREAL /CAN/ added | 199,427 | $34M | 0.1% | 2026-Q2 |
| LAZARD ASSET MANAGEMENT LLC added | 193,220 | $33M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 193,061 | $33M | 0.1% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. added | 192,607 | $33M | 0.1% | 2026-Q2 |
| DEARBORN PARTNERS LLC | 188,269 | $35M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.