ATO Institutional Ownership & Shareholders
ATMOS ENERGY CORP (ATO) is currently held by 1,043 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $27.45B based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of ATO tracked by InsiderSet, reporting ownership valued at approximately $2.62B in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $2.63B, representing an estimated gain of +0.08% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 49% of the total disclosed ATO value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., State Street Corp, Vanguard Capital Management Llc, and several other long-term asset managers with concentrated positions in ATMOS ENERGY CORP (ATO).
This page ranks the largest institutional ATO shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
1,043
Total Reported Value
$27.45B
Largest Holder
Blackrock, Inc.
Largest Position
$2.62B
Insider Transactions (90d)
3
Latest Filing Quarter
Q2 2026
New Institutional Positions
49
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.04% | 15,237,564 | $2,624,975,204 | $2,627,108,409 | +$2,133,205 | +0.08% | |
| State Street Corp | 0.06% | 11,380,060 | $1,960,442,936 | $1,962,036,145 | +$1,593,209 | +0.08% | |
| Vanguard Capital Management Llc | 0.04% | 10,885,153 | $1,875,185,307 | $1,876,709,229 | +$1,523,922 | +0.08% | |
| Vanguard Portfolio Management Llc | 0.07% | 9,360,135 | $1,612,470,457 | $1,613,780,875 | +$1,310,418 | +0.08% | |
| Wellington Management Group Llp | 0.27% | 9,185,788 | $1,582,435,699 | $1,583,721,709 | +$1,286,010 | +0.08% | |
| Capital International Investors | 0.27% | 7,483,012 | $1,289,959,643 | $1,290,146,099 | +$186,456 | +0.01% | |
| Geode Capital Management, Llc | 0.04% | 4,489,277 | $770,329,095 | $773,996,248 | +$3,667,153 | +0.48% | |
| Bank Of America Corp | 0.05% | 4,180,718 | $720,212,336 | $720,797,590 | +$585,254 | +0.08% | |
| Invesco Ltd. | 0.04% | 3,173,775 | $546,746,189 | $547,190,548 | +$444,359 | +0.08% | |
| Morgan Stanley | 0.03% | 2,863,719 | $493,333,105 | $493,733,793 | +$400,688 | +0.08% | |
| Deutsche Bank Ag\ | 0.13% | 2,505,816 | $431,676,922 | $432,027,737 | +$350,815 | +0.08% | |
| Price T Rowe Associates Inc | 0.04% | 2,481,649 | $427,515,000 | $427,861,104 | +$346,104 | +0.08% | |
| Aqr Capital Management Llc | 0.14% | 2,373,903 | $408,952,307 | $409,284,616 | +$332,309 | +0.08% | |
| Goldman Sachs Group Inc | 0.04% | 2,165,784 | $373,099,563 | $373,402,819 | +$303,256 | +0.08% | |
| Qube Research & Technologies Ltd | 0.41% | 2,136,532 | $368,060,368 | $368,359,482 | +$299,114 | +0.08% | |
| Norges Bank | 0.04% | 2,079,227 | $358,188,435 | $358,479,527 | +$291,092 | +0.08% | |
| Massachusetts Financial Services Co | 0.10% | 1,842,583 | $321,411,259 | $317,679,735 | -$3,731,524 | -1.16% | |
| Citadel Advisors Llc | 0.17% | 1,736,405 | $299,130,489 | $299,373,586 | +$243,097 | +0.08% | |
| Legal & General Group Plc | 0.06% | 1,605,373 | $276,557,615 | $276,782,359 | +$224,744 | +0.08% | |
| Capital Research Global Investors | 0.04% | 1,508,563 | $259,885,813 | $260,091,347 | +$205,534 | +0.08% | |
| Dz Bank Ag Deutsche Zentral Genossenschafts Bank, Frankfurt Am Main | 0.20% | 1,491,483 | $256,937,775 | $257,146,584 | +$208,809 | +0.08% | |
| Northern Trust Corp | 0.03% | 1,393,267 | $240,018,106 | $240,213,163 | +$195,057 | +0.08% | |
| Point72 Asset Management, L.P. | 0.36% | 1,361,162 | $234,487,378 | $234,677,940 | +$190,562 | +0.08% | |
| Raymond James Financial Inc | 0.06% | 1,271,473 | $219,036,634 | $219,214,660 | +$178,026 | +0.08% | |
| Pictet Asset Management Holding Sa | 0.21% | 1,270,400 | $218,851,808 | $219,029,664 | +$177,856 | +0.08% | |
| Wells Fargo & Company/Mn | 0.04% | 1,204,326 | $207,469,130 | $207,637,846 | +$168,716 | +0.08% | |
| Gqg Partners Llc | 0.38% | 1,175,136 | $202,443,484 | $202,605,198 | +$161,714 | +0.08% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.04% | 1,063,678 | $196,482,600 | $183,388,724 | -$13,093,876 | -6.66% | |
| Sfmg, Llc | 11.13% | 1,060,369 | $182,669,745 | $182,818,219 | +$148,474 | +0.08% | |
| Charles Schwab Investment Management Inc | 0.02% | 1,059,660 | $182,547,628 | $182,695,981 | +$148,353 | +0.08% | |
| Perpetual Ltd | 2.70% | 1,132,448 | $177,160,165 | $195,245,360 | +$18,085,195 | +10.21% | |
| Cbre Investment Management Listed Real Assets Llc | 2.40% | 999,550 | $172,192,479 | $172,332,416 | +$139,937 | +0.08% | |
| American Century Companies Inc | 0.08% | 998,021 | $171,929,120 | $172,068,801 | +$139,681 | +0.08% | |
| Vanguard Fiduciary Trust Co | 0.04% | 936,822 | $161,386,326 | $161,517,481 | +$131,155 | +0.08% | |
| Nuveen, Llc | 0.04% | 896,066 | $154,365,195 | $154,490,739 | +$125,544 | +0.08% | |
| Bank Of New York Mellon Corp | 0.02% | 877,494 | $151,165,891 | $151,288,741 | +$122,850 | +0.08% | |
| Proshare Advisors Llc | 0.22% | 965,250 | $151,003,712 | $166,418,753 | +$15,415,041 | +10.21% | |
| Pnc Financial Services Group, Inc. | 0.08% | 832,731 | $143,454,547 | $143,571,152 | +$116,605 | +0.08% | |
| Dimensional Fund Advisors Lp | 0.02% | 768,834 | $132,463,944 | $132,554,670 | +$90,726 | +0.07% | |
| Sg Americas Securities, Llc | 0.07% | 739,939 | $127,469,000 | $127,572,883 | +$103,883 | +0.08% | |
| Ubs Group Ag | 0.02% | 713,094 | $122,844,704 | $122,944,537 | +$99,833 | +0.08% | |
| Silvercrest Asset Management Group Llc | 0.77% | 682,414 | $117,559,794 | $117,654,998 | +$95,204 | +0.08% | |
| Hsbc Holdings Plc | 0.06% | 672,843 | $115,984,972 | $116,004,862 | +$19,890 | +0.02% | |
| Fmr Llc | 0.00% | 660,432 | $113,772,614 | $113,865,081 | +$92,467 | +0.08% | |
| Cohen & Steers, Inc. | 0.17% | 641,326 | $110,481,000 | $110,571,016 | +$90,016 | +0.08% | |
| Duff & Phelps Investment Management Co | 1.04% | 637,725 | $109,860,886 | $109,950,167 | +$89,281 | +0.08% | |
| Bnp Paribas Financial Markets | 0.05% | 608,876 | $104,891,069 | $104,976,311 | +$85,242 | +0.08% | |
| Envestnet Asset Management Inc | 0.02% | 603,994 | $104,050,109 | $104,134,606 | +$84,497 | +0.08% | |
| Ontario Teachers Pension Plan Board | 0.64% | 586,175 | $100,980,367 | $101,062,432 | +$82,065 | +0.08% | |
| Neuberger Berman Group Llc | 0.07% | 596,913 | $100,080,685 | $102,913,770 | +$2,833,085 | +2.83% |
Frequently asked questions about ATO
Who are the largest institutional holders of ATO?
The largest institutional holders of ATO reported in the latest SEC Form 13F filings include Blackrock, Inc., State Street Corp, Vanguard Capital Management Llc, Vanguard Portfolio Management Llc, and Wellington Management Group Llp. InsiderSet ranks institutional holders by their latest reported ATO position.
What is ATO institutional ownership?
This page tracks ATO positions reported by institutional investment managers through SEC Form 13F. ATMOS ENERGY CORP (ATO) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own ATO?
InsiderSet currently tracks 1,043 institutional managers reporting ATO holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of ATO shareholders.
How much ATO stock do institutions own?
Institutional investment managers disclosed approximately $27.45B in ATO holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was ATO institutional ownership last updated?
The latest ATO institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional ATO holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its ATO position after the reporting date.
Are institutions buying or selling ATO?
Institutional buying and selling can be analyzed by comparing ATO positions across consecutive 13F reporting periods. InsiderSet's ATO Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View ATO ownership changes.
How has ATO institutional ownership changed over time?
InsiderSet tracks ATO institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.