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Equibles

ATI

Ati Inc

Company with tickers: ATI

CIK
1018963
CUSIP
01741R102
Shares Outstanding
136,470,427
13F Activity (30d)
200 filings 196 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: 611
Total Value: $8,322,050,321
Total Shares: 57,211,953
Showing 1–100 of 634 holdings by value · page 1 of 7

Institutional Ownership Trend

25 quarters

Superinvestors Holding ATI

All superinvestors →
Mario Gabelli $43,964,556 Joel Greenblatt $37,890,584 George Soros $7,684,942 Ray Dalio $3,192,847

Holder Concentration

Across 611 13F filers · Δ vs Dec 31, 2025
Top Holder
12.2%
Jun 2023 → Mar 2026 · range 11.7% – 15.1%
+0.2 pts
Top 5
34.9%
Jun 2023 → Mar 2026 · range 29.5% – 45.8%
+5.4 pts
Top 10
46.0%
Jun 2023 → Mar 2026 · range 42.1% – 60.8%
+3.9 pts
HHI
382
Jun 2023 → Mar 2026 · range 301 – 568
Broadly held+82

Quarterly Activity

vs Dec 31, 2025
New
163
Increased
212
Decreased
163
Sold Out
69
Unchanged
73
Holder count: +94
Institutional value: +56.3%
Shares held: +23.3%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Large SG Americas Securities, LLC +1,006,951 1,075,368
Mega PNC FINANCIAL SERVICES GROUP, INC. +785,885 831,736
Large Assenagon Asset Management S.A. +558,212 584,030
Mega GEODE CAPITAL MANAGEMENT, LLC +528,157 2,947,325
Mega BNP PARIBAS ARBITRAGE, SA +259,314 651,996

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mid DENDUR CAPITAL LP −756,188 1,283,103
Mega AMERICAN CENTURY COMPANIES INC −520,735 1,069,282
Mega NEUBERGER BERMAN GROUP LLC −327,789 494,925
Mid Twin Tree Management, LP −323,020 22,280
Mega D. E. Shaw & Co., Inc. −288,112 1,752,209

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD CAPITAL MANAGEMENT LLC 13,269,573 $1,930,192,087
Mega VANGUARD FIDUCIARY TRUST CO 844,377 $122,823,078
Mid Artemis Investment Management LLP 721,505 $104,950,117
Large Freestone Grove Partners LP 575,873 $83,766,486
Large BANK OF NOVA SCOTIA 467,149 $67,951,493

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mid FRONTIER CAPITAL MANAGEMENT CO LLC 1,227,453 $140,862,506
Mega UBS Group AG 1,193,129 $136,923,481
Large LOOMIS SAYLES & CO L P 935,673 $107,377,832
Large Jain Global LLC 665,276 $76,347,073
Large Qube Research & Technologies Ltd 430,227 $49,372,850
Filter: New 163 Increased 212 Reduced 163 Sold out 69 Unchanged 73
Showing 100 of 634
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mega VANGUARD CAPITAL MANAGEMENT LLC $1,039,376,429 12.49% 7,145,445
Mega VANGUARD CAPITAL MANAGEMENT LLC $890,815,658 10.70% 6,124,128
Mega STATE STREET CORP $782,722,150 9.41% 5,381,013
Mega GEODE CAPITAL MANAGEMENT, LLC $428,717,894 5.15% 2,947,325
Mega D. E. Shaw & Co., Inc. $253,479,904 3.05% 1,742,609
Mid DENDUR CAPITAL LP $186,640,162 2.24% 1,283,103
Mega NORTHERN TRUST CORP Bank $180,227,847 2.17% 1,239,020
Large Holocene Advisors, LP $159,655,150 1.92% 1,097,588
Large SG Americas Securities, LLC Broker-Dealer $156,423,029 1.88% 1,075,368
Mega AMERICAN CENTURY COMPANIES INC $155,537,759 1.87% 1,069,282
Mid BOWEN HANES & CO INC $151,730,053 1.82% 1,043,105
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $150,227,305 1.81% 1,032,774
Mega Fisher Asset Management, LLC $134,480,824 1.62% 924,521
Mega VANGUARD FIDUCIARY TRUST CO Bank $122,823,078 1.48% 844,377
Mega PNC FINANCIAL SERVICES GROUP, INC. $120,984,318 1.45% 831,736
Large BARROW HANLEY MEWHINNEY & STRAUSS LLC $113,817,503 1.37% 782,466
Mid Artemis Investment Management LLP $104,950,117 1.26% 721,505
Mega BNP PARIBAS ARBITRAGE, SA $94,839,338 1.14% 651,996
Mega RAYMOND JAMES FINANCIAL INC $92,906,171 1.12% 638,706
Large Assenagon Asset Management S.A. $84,953,003 1.02% 584,030
Mega Nuveen, LLC $84,165,482 1.01% 578,616
Large Freestone Grove Partners LP $83,766,486 1.01% 575,873
Large MARSHALL WACE, LLP $78,036,089 0.94% 536,478
Mega NEUBERGER BERMAN GROUP LLC $71,991,790 0.87% 494,925
Large BANK OF NOVA SCOTIA Bank $67,951,493 0.82% 467,149
Mega SCHRODER INVESTMENT MANAGEMENT GROUP $58,561,176 0.70% 402,593
Mid VAUGHAN NELSON INVESTMENT MANAGEMENT, L.P. $55,620,265 0.67% 382,375
Large ING GROEP NV $54,911,150 0.66% 377,500
Small Square Wave Capital, LLC $53,296,544 0.64% 366,400
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $51,600,041 0.62% 354,737
Mega RHUMBLINE ADVISERS $51,546,805 0.62% 354,371
Large JUPITER ASSET MANAGEMENT LTD $49,700,336 0.60% 341,677
Large Retirement Systems of Alabama Pension $45,425,267 0.55% 312,287
Mega PRINCIPAL FINANCIAL GROUP INC $44,097,362 0.53% 303,158
Mid SEGALL BRYANT & HAMILL, LLC $40,346,385 0.48% 277,371
Mega Swiss National Bank Bank $39,099,648 0.47% 268,800
Large Allianz Asset Management GmbH $38,959,132 0.47% 267,834
Mid KLCM Advisors, Inc. $38,232,560 0.46% 262,839
Large Gotham Asset Management, LLC $37,890,584 0.46% 260,488
Mega California Public Employees Retirement System Pension $36,917,311 0.44% 253,797
Large HRT FINANCIAL LP $36,786,543 0.44% 252,898
Large BLAIR WILLIAM & CO/IL $34,473,438 0.41% 236,996
Large Capital International, Inc./CA/ $34,172,626 0.41% 234,928
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $33,004,874 0.40% 226,900
Mega ENVESTNET ASSET MANAGEMENT INC $31,387,067 0.38% 215,778
Mega Legal & General Group Plc $30,837,228 0.37% 211,998
Mid HAWK RIDGE CAPITAL MANAGEMENT LP $26,997,376 0.32% 185,600
Mid Aventail Capital Group, LP $26,955,483 0.32% 185,312
Large LORD, ABBETT & CO. LLC $26,480,847 0.32% 182,049
Mid EMERALD ADVISERS, LLC $26,398,808 0.32% 181,485
Large PEAK6 LLC $24,975,482 0.30% 171,700
Mega LPL Financial LLC $24,083,812 0.29% 165,570
Large PANAGORA ASSET MANAGEMENT INC $24,078,139 0.29% 165,531
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $22,947,915 0.28% 157,761
Large Walleye Capital LLC $21,253,015 0.26% 146,109
Mid Senator Investment Group LP $21,091,700 0.25% 145,000
Large NEW YORK STATE TEACHERS RETIREMENT SYSTEM Pension $19,585,025 0.24% 134,642
Large NATIXIS ADVISORS, LLC $18,077,332 0.22% 124,277
Mid Sanctuary Advisors, LLC $16,817,503 0.20% 115,616
Large Russell Investments Group, Ltd. $15,891,356 0.19% 109,249
Mega DEUTSCHE BANK AG\ Bank $15,693,532 0.19% 107,889
Mid ALGERT GLOBAL LLC $15,601,166 0.19% 107,254
Large CIBC Bancorp USA Inc. Bank $15,551,855 0.19% 106,915
Mega VANGUARD ASSET MANAGEMENT, Ltd $15,247,699 0.18% 104,824
Large GUGGENHEIM CAPITAL LLC $15,180,350 0.18% 104,361
Large Tidal Investments LLC $15,079,256 0.18% 103,666
Small FACT Capital, LP $14,997,216 0.18% 103,102
Mid Advisors Asset Management, Inc. $14,910,377 0.18% 102,505
Mid SIGNATURE ESTATE & INVESTMENT ADVISORS LLC $14,539,017 0.17% 99,952
Mid Voleon Capital Management LP $14,389,339 0.17% 98,923
Large STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM Pension $14,332,173 0.17% 98,530
Mid EMERALD MUTUAL FUND ADVISERS TRUST Mutual Fund $13,650,984 0.16% 93,847
Mega FIRST TRUST ADVISORS LP $13,549,162 0.16% 93,147
Large STIFEL FINANCIAL CORP $13,472,358 0.16% 92,619
Small Mountaineer Partners Management, LLC $13,350,900 0.16% 91,784
Small TRAN CAPITAL MANAGEMENT, L.P. $13,216,786 0.16% 90,862
Large SEI INVESTMENTS CO $13,097,945 0.16% 90,045
Large TUDOR INVESTMENT CORP ET AL $12,936,485 0.16% 88,935
Large ExodusPoint Capital Management, LP $12,831,317 0.15% 88,212
Large HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND Pension $12,661,129 0.15% 87,042
Large Epoch Investment Partners, Inc. $12,451,521 0.15% 85,601
Mid SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC $12,042,051 0.14% 82,786
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $11,898,628 0.14% 81,800
Mid Tema ETFs LLC Mutual Fund $11,820,225 0.14% 81,261
Large Rokos Capital Management LLP $11,686,692 0.14% 80,343
Large NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO $11,536,141 0.14% 79,308
Large CANADA LIFE ASSURANCE Co Insurance $11,420,500 0.14% 78,513
Mid Channing Capital Management, LLC $11,345,589 0.14% 77,998
Mega CITIGROUP INC $10,999,102 0.13% 75,616
Mid Anomaly Capital Management, LP $10,884,771 0.13% 74,830
Large Mariner, LLC $10,543,959 0.13% 72,487
Small Mengis Capital Management, Inc. $10,277,039 0.12% 70,652
Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE Insurance $10,119,361 0.12% 69,568
Small GLOBEFLEX CAPITAL L P $10,060,159 0.12% 69,161
Mid Engineers Gate Manager LP $10,028,739 0.12% 68,945
Large MetLife Investment Management, LLC $9,719,055 0.12% 66,816
Large CREDIT AGRICOLE S A $9,603,559 0.12% 66,022
Large NEW YORK STATE COMMON RETIREMENT FUND Pension $9,227,546 0.11% 63,437
Mid Brevan Howard Capital Management LP $9,121,796 0.11% 62,710
Large AMALGAMATED BANK Bank $9,096,486 0.11% 62,536

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