ATI INC (ATI) Institutional Shareholders
ATI INC (ATI) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $18.26B in ATI holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of ATI tracked by InsiderSet, reporting ownership valued at approximately $2.39B in its March 31, 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 $3.08B, representing an estimated gain of +28.86% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 51% of the total disclosed ATI value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Capital Research Global Investors, Vanguard Capital Management Llc, and several other long-term asset managers with concentrated positions in ATI INC (ATI).
This page ranks the largest institutional ATI 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
727
Total Reported Value
$18.26B
Largest Holder
Blackrock, Inc.
Largest Position
$2.39B
Insider Transactions (90d)
28
Latest Filing Quarter
Q2 2026
New Institutional Positions
97
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% | 16,441,653 | $2,391,602,818 | $3,081,823,438 | +$690,220,620 | +28.86% | |
| Capital Research Global Investors | 0.14% | 6,160,107 | $895,961,750 | $1,154,650,456 | +$258,688,706 | +28.87% | |
| Vanguard Capital Management Llc | 0.02% | 6,124,128 | $890,815,659 | $1,147,906,552 | +$257,090,893 | +28.86% | |
| Capital International Investors | 0.20% | 5,883,949 | $854,869,070 | $1,102,887,401 | +$248,018,331 | +29.01% | |
| Vanguard Portfolio Management Llc | 0.04% | 5,821,508 | $846,796,554 | $1,091,183,460 | +$244,386,906 | +28.86% | |
| Capital World Investors | 0.11% | 5,712,929 | $831,002,652 | $1,070,831,412 | +$239,828,760 | +28.86% | |
| State Street Corp | 0.03% | 5,381,013 | $782,722,151 | $1,008,617,077 | +$225,894,926 | +28.86% | |
| Fmr Llc | 0.04% | 5,247,175 | $763,254,091 | $983,530,482 | +$220,276,391 | +28.86% | |
| Invesco Ltd. | 0.09% | 3,855,643 | $560,841,879 | $722,701,724 | +$161,859,845 | +28.86% | |
| Viking Global Investors | Ole Andreas Halvorsen | 1.36% | 3,332,843 | $484,795,343 | $624,708,092 | +$139,912,749 | +28.86% |
| Geode Capital Management, Llc | 0.03% | 2,947,325 | $428,807,254 | $552,446,598 | +$123,639,344 | +28.83% | |
| Point72 Asset Management, L.P. | 0.49% | 1,932,579 | $281,112,941 | $362,242,608 | +$81,129,667 | +28.86% | |
| D. E. Shaw & Co., Inc. | 0.20% | 1,742,609 | $253,479,905 | $326,634,631 | +$73,154,726 | +28.86% | |
| Morgan Stanley | 0.01% | 1,668,591 | $242,713,664 | $312,760,697 | +$70,047,033 | +28.86% | |
| Charles Schwab Investment Management Inc | 0.03% | 1,502,129 | $218,499,684 | $281,559,060 | +$63,059,376 | +28.86% | |
| Jane Street Group, Llc | 0.23% | 1,491,263 | $216,919,115 | $279,522,337 | +$62,603,222 | +28.86% | |
| Ubs Group Ag | 0.04% | 1,419,080 | $206,419,377 | $265,992,355 | +$59,572,978 | +28.86% | |
| Dimensional Fund Advisors Lp | 0.04% | 1,366,804 | $198,718,554 | $256,193,742 | +$57,475,188 | +28.92% | |
| Bank Of America Corp | 0.01% | 1,364,941 | $198,544,318 | $255,844,541 | +$57,300,223 | +28.86% | |
| Dendur Capital Lp | 13.73% | 1,283,103 | $186,640,162 | $240,504,826 | +$53,864,664 | +28.86% | |
| Northern Trust Corp | 0.02% | 1,239,020 | $180,227,849 | $232,241,909 | +$52,014,060 | +28.86% | |
| Arrowstreet Capital, Limited Partnership | 0.09% | 1,203,726 | $175,093,984 | $225,626,401 | +$50,532,417 | +28.86% | |
| Aqr Capital Management Llc | 0.08% | 1,222,580 | $174,132,098 | $229,160,395 | +$55,028,297 | +31.60% | |
| Artemis Investment Management Llp | 1.48% | 841,493 | $165,858,270 | $157,729,448 | -$8,128,822 | -4.90% | |
| Holocene Advisors, Lp | 0.39% | 1,097,588 | $159,655,150 | $205,731,895 | +$46,076,745 | +28.86% | |
| American Century Companies Inc | 0.08% | 1,069,282 | $155,538,135 | $200,426,218 | +$44,888,083 | +28.86% | |
| Bowen Hanes & Co Inc | 3.69% | 1,043,105 | $151,730,053 | $195,519,601 | +$43,789,548 | +28.86% | |
| Mirae Asset Global Etfs Holdings Ltd. | 0.20% | 1,032,774 | $150,213,382 | $193,583,159 | +$43,369,777 | +28.87% | |
| Ameriprise Financial Inc | 0.03% | 998,834 | $145,290,393 | $187,221,445 | +$41,931,052 | +28.86% | |
| Fisher Asset Management, Llc | 0.05% | 924,521 | $134,480,823 | $173,292,216 | +$38,811,393 | +28.86% | |
| Assenagon Asset Management S.A. | 0.17% | 657,117 | $129,517,761 | $123,170,010 | -$6,347,751 | -4.90% | |
| Bank Of New York Mellon Corp | 0.02% | 869,184 | $126,431,536 | $162,919,849 | +$36,488,313 | +28.86% | |
| Qube Research & Technologies Ltd | 0.18% | 858,818 | $124,923,666 | $160,976,846 | +$36,053,180 | +28.86% | |
| Balyasny Asset Management L.P. | 0.24% | 851,664 | $123,883,045 | $159,635,900 | +$35,752,855 | +28.86% | |
| Vanguard Fiduciary Trust Co | 0.03% | 844,377 | $122,823,078 | $158,270,025 | +$35,446,947 | +28.86% | |
| Pnc Financial Services Group, Inc. | 0.08% | 830,812 | $120,849,913 | $155,727,401 | +$34,877,488 | +28.86% | |
| Prudential Financial Inc | 0.15% | 809,970 | $117,818,236 | $151,820,777 | +$34,002,541 | +28.86% | |
| Barrow Hanley Mewhinney & Strauss Llc | 0.37% | 782,466 | $113,817,504 | $146,665,427 | +$32,847,923 | +28.86% | |
| Frontier Capital Management Co Llc | 1.04% | 694,422 | $101,010,604 | $130,162,460 | +$29,151,856 | +28.86% | |
| Loomis Sayles & Co L P | 0.13% | 653,416 | $95,045,892 | $122,476,295 | +$27,430,403 | +28.86% | |
| Bnp Paribas Financial Markets | 0.06% | 651,996 | $94,839,338 | $122,210,130 | +$27,370,792 | +28.86% | |
| Raymond James Financial Inc | 0.03% | 638,706 | $92,492,286 | $119,719,053 | +$27,226,767 | +29.44% | |
| Millennium Management Llc | 0.07% | 619,240 | $90,074,650 | $116,070,346 | +$25,995,696 | +28.86% | |
| Nuveen, Llc | 0.02% | 578,616 | $84,165,484 | $108,455,783 | +$24,290,299 | +28.86% | |
| Freestone Grove Partners Lp | 0.61% | 575,873 | $83,766,487 | $107,941,635 | +$24,175,148 | +28.86% | |
| Federated Hermes, Inc. | 0.13% | 545,532 | $79,353,085 | $102,254,518 | +$22,901,433 | +28.86% | |
| Allspring Global Investments Holdings, Llc | 0.13% | 520,246 | $78,687,207 | $97,514,910 | +$18,827,703 | +23.93% | |
| Marshall Wace, Llp | 0.08% | 536,478 | $78,036,089 | $100,557,436 | +$22,521,347 | +28.86% | |
| Neuberger Berman Group Llc | 0.05% | 494,925 | $71,991,838 | $92,768,742 | +$20,776,904 | +28.86% | |
| Bank Of Nova Scotia | 0.12% | 467,149 | $67,951,494 | $87,562,409 | +$19,610,915 | +28.86% |
Frequently asked questions about ATI
Who owns the most ATI stock?
The largest holders of ATI are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for ATI INC (ATI).
Is ATI widely held by superinvestors?
Many widely followed stocks like ATI appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly ATI is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.