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Equibles

ATO

Atmos Energy Corp

Company with tickers: ATO

CIK
731802
CUSIP
049560105
Shares Outstanding
166,919,822
13F Activity (30d)
278 filings 268 filers

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 1,011
Total Value: $29,575,651,877
Total Shares: 160,110,722
Showing 1–100 of 1,021 holdings by value · page 1 of 11

Institutional Ownership Trend

25 quarters

Superinvestors Holding ATO

All superinvestors →
Joel Greenblatt $12,564,100

Holder Concentration

Across 1,011 13F filers · Δ vs Dec 31, 2025
Top Holder
10.9%
Jun 2023 → Mar 2026 · range 10.9% – 14.6%
−2.3 pts
Top 5
36.5%
Jun 2023 → Mar 2026 · range 36.5% – 50.3%
−4.6 pts
Top 10
52.0%
Jun 2023 → Mar 2026 · range 50.8% – 59.6%
+1.2 pts
HHI
365
Jun 2023 → Mar 2026 · range 365 – 603
Broadly held−87

Quarterly Activity

vs Dec 31, 2025
New
166
Increased
394
Decreased
291
Sold Out
104
Unchanged
160
Holder count: +62
Institutional value: +96.0%
Shares held: +77.9%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mega STATE STREET CORP +586,392 11,372,750
Mega BNP PARIBAS ARBITRAGE, SA +516,491 834,718
Mega Nuveen, LLC +463,524 947,508
Mega Amundi +432,147 1,302,886
Mega BANK OF AMERICA CORP /DE/ +416,933 4,199,433

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mega Capital International Investors −4,567,048 7,326,778
Large Aristotle Capital Management, LLC −1,503,648 4,866,481
Mid COOKE & BIELER LP −637,699 2,942
Mega DEUTSCHE BANK AG\ −340,330 2,547,037
Mid Merewether Investment Management, LP −166,727 71,509

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega BlackRock, Inc. 17,451,963 $3,223,726,595
Mega VANGUARD CAPITAL MANAGEMENT LLC 10,735,547 $1,983,070,241
Mega WELLINGTON MANAGEMENT GROUP LLP 9,651,472 $1,782,819,903
Mega VANGUARD PORTFOLIO MANAGEMENT LLC 9,285,633 $1,715,242,127
Mega Capital Research Global Investors 4,010,550 $740,828,796

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mid MIZUHO MARKETS AMERICAS LLC 240,814 $40,367,650
Mid Skandinaviska Enskilda Banken AB (publ) 145,874 $24,452,858
Mid SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC 80,229 $13,448,787
Mega D. E. Shaw & Co., Inc. 73,350 $12,295,660
— FORSTA AP-FONDEN 65,000 $10,895,950
Filter: New 166 Increased 394 Reduced 291 Sold out 104 Unchanged 160
Showing 100 of 1,021
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mega BlackRock, Inc. $3,223,726,595 10.90% 17,451,963
Mega STATE STREET CORP $2,100,774,380 7.10% 11,372,750
Mega VANGUARD CAPITAL MANAGEMENT LLC $1,983,070,241 6.71% 10,735,547
Mega WELLINGTON MANAGEMENT GROUP LLP $1,782,819,903 6.03% 9,651,472
Mega VANGUARD PORTFOLIO MANAGEMENT LLC $1,715,242,127 5.80% 9,285,633
Mega Capital International Investors $1,353,402,432 4.58% 7,326,778
Large Aristotle Capital Management, LLC $898,936,370 3.04% 4,866,481
Mega GEODE CAPITAL MANAGEMENT, LLC $801,129,901 2.71% 4,336,996
Mega BANK OF AMERICA CORP /DE/ Bank $775,719,261 2.62% 4,199,433
Mega Capital Research Global Investors $740,828,796 2.50% 4,010,550
Mega Invesco Ltd. $555,509,558 1.88% 3,007,306
Mega MORGAN STANLEY $554,379,070 1.87% 3,001,186
Mega PRICE T ROWE ASSOCIATES INC /MD/ $501,534,564 1.70% 2,715,107
Mega DEUTSCHE BANK AG\ Bank $470,488,673 1.59% 2,547,037
Mega GOLDMAN SACHS GROUP INC $357,463,120 1.21% 1,935,162
Mega MASSACHUSETTS FINANCIAL SERVICES CO /MA/ $327,434,853 1.11% 1,772,601
Mega Legal & General Group Plc $298,577,711 1.01% 1,616,380
Mega NORTHERN TRUST CORP Bank $286,259,472 0.97% 1,549,694
Mega DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main Bank $275,353,421 0.93% 1,490,653
Mega WELLS FARGO & COMPANY/MN $245,553,466 0.83% 1,329,328
Mega Amundi $240,669,099 0.81% 1,302,886
Mid Perpetual Ltd $229,139,432 0.77% 1,240,469
Mega RAYMOND JAMES FINANCIAL INC $222,911,226 0.75% 1,206,752
Large Pictet Asset Management Holding SA $217,122,658 0.73% 1,175,415
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $196,482,595 0.66% 1,063,678
Small SFMG, LLC $195,534,432 0.66% 1,058,545
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $191,484,631 0.65% 1,036,621
Large ProShare Advisors LLC $189,127,788 0.64% 1,023,862
Mega AMERICAN CENTURY COMPANIES INC $185,174,041 0.63% 1,002,458
Mega Nuveen, LLC $175,023,676 0.59% 947,508
Mega VANGUARD FIDUCIARY TRUST CO Bank $171,908,190 0.58% 930,642
Mega Bank of New York Mellon Corp Bank $164,898,799 0.56% 892,696
Large GQG Partners LLC $163,884,322 0.55% 887,204
Mega PNC FINANCIAL SERVICES GROUP, INC. $163,715,669 0.55% 886,291
Mega BNP PARIBAS ARBITRAGE, SA $154,189,108 0.52% 834,718
Mega AQR CAPITAL MANAGEMENT LLC $151,983,178 0.51% 822,776
Large COHEN & STEERS, INC. $147,821,441 0.50% 800,246
Mega JPMORGAN CHASE & CO $147,079,042 0.50% 796,227
Mega HSBC HOLDINGS PLC $144,115,586 0.49% 780,184
Mid CBRE INVESTMENT MANAGEMENT LISTED REAL ASSETS LLC $140,009,078 0.47% 757,953
Mega DIMENSIONAL FUND ADVISORS LP $139,091,572 0.47% 752,986
Mega CITADEL ADVISORS LLC $138,836,290 0.47% 751,604
Mega UBS Group AG $132,755,861 0.45% 718,687
Large SILVERCREST ASSET MANAGEMENT GROUP LLC $130,638,602 0.44% 707,225
Mega ENVESTNET ASSET MANAGEMENT INC $124,605,831 0.42% 674,566
Large PFA Pension, Forsikringsaktieselskab Pension $123,400,348 0.42% 668,040
Mid DUFF & PHELPS INVESTMENT MANAGEMENT CO $112,299,600 0.38% 607,945
Mega NEUBERGER BERMAN GROUP LLC $111,033,344 0.38% 601,090
Large Chevy Chase Trust Holdings, LLC $95,816,664 0.32% 518,713
Large SEI INVESTMENTS CO $94,729,033 0.32% 512,825
Mega PRINCIPAL FINANCIAL GROUP INC $93,727,666 0.32% 507,404
Mega ROYAL BANK OF CANADA Bank $93,087,239 0.31% 503,937
Small Nilsine Partners, LLC $90,758,662 0.31% 491,331
Mega Swiss National Bank Bank $87,686,584 0.30% 474,700
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $87,511,654 0.30% 473,753
Large HUNTINGTON NATIONAL BANK Bank $86,445,634 0.29% 467,982
Large Clark Capital Management Group, Inc. $79,887,151 0.27% 432,477
Large EARNEST PARTNERS LLC $78,101,463 0.26% 422,810
Mega Mitsubishi UFJ Asset Management Co., Ltd. $73,365,611 0.25% 397,172
Mega Sumitomo Mitsui Trust Group, Inc. $72,906,952 0.25% 394,689
Large AVIVA PLC $70,877,433 0.24% 383,702
Mega BARCLAYS PLC $68,963,732 0.23% 373,342
Mid Energy Income Partners, LLC $67,110,807 0.23% 363,311
Mega Vanguard Global Advisers, LLC $66,655,103 0.23% 360,844
Mega T. Rowe Price Investment Management, Inc. $66,250,197 0.22% 358,652
Mega RHUMBLINE ADVISERS $65,383,491 0.22% 353,960
Mega JENNISON ASSOCIATES LLC $63,929,744 0.22% 346,090
Mega FIRST TRUST ADVISORS LP $62,880,165 0.21% 340,408
Mid BENJAMIN EDWARDS INC $62,676,050 0.21% 339,303
Large BAHL & GAYNOR INC $62,019,740 0.21% 335,750
Large Capital International, Inc./CA/ $60,147,233 0.20% 325,613
Large Boston Trust Walden Corp $60,020,515 0.20% 324,927
Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE Insurance $59,742,696 0.20% 323,423
Large KBC Group NV $58,431,923 0.20% 316,327
Large TORONTO DOMINION BANK Bank $57,163,635 0.19% 309,461
Mid Vest Financial, LLC $56,812,852 0.19% 307,562
Mega VANGUARD ASSET MANAGEMENT, Ltd $56,102,234 0.19% 303,715
Large COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS $55,780,452 0.19% 301,973
Large NEW YORK STATE COMMON RETIREMENT FUND Pension $54,576,817 0.18% 295,457
Mega California Public Employees Retirement System Pension $53,724,518 0.18% 290,843
Large NOMURA ASSET MANAGEMENT CO LTD $53,491,217 0.18% 289,580
Mega MILLENNIUM MANAGEMENT LLC $48,289,687 0.16% 261,421
Mega SCHRODER INVESTMENT MANAGEMENT GROUP $47,885,149 0.16% 259,231
Large ROYAL LONDON ASSET MANAGEMENT LTD $47,110,065 0.16% 255,035
Mid Munich Reinsurance Co Stock Corp in Munich Insurance $46,505,291 0.16% 251,761
Mid Aventail Capital Group, LP $45,780,635 0.15% 247,838
Mega National Pension Service Pension $45,198,582 0.15% 244,687
Mega CITIGROUP INC $44,648,116 0.15% 241,707
Mid Partners Group Holding AG $44,001,412 0.15% 238,206
Large STIFEL FINANCIAL CORP $43,039,388 0.15% 232,998
Large Aberdeen Group plc $42,156,244 0.14% 228,217
Mega Clearbridge Investments, LLC $40,983,641 0.14% 221,869
Large M&G PLC $37,205,932 0.13% 201,418
Mid EXCHANGE TRADED CONCEPTS, LLC $36,104,816 0.12% 195,457
Mega LPL Financial LLC $35,886,847 0.12% 194,277
Large Eurizon Capital SGR S.p.A. $34,976,732 0.12% 189,350
Large Allspring Global Investments Holdings, LLC $34,959,367 0.12% 189,256
Mid DEARBORN PARTNERS LLC $34,777,049 0.12% 188,269
Large CANADA LIFE ASSURANCE Co Insurance $34,737,334 0.12% 188,054
Large Universal- Beteiligungs- und Servicegesellschaft mbH $34,084,164 0.12% 184,518

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