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 $24.83B 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 $3.69B 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 $3.55B, representing an estimated loss of -3.78% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 49% of the total disclosed ATI value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Portfolio Management Llc, 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
769
Total Reported Value
$24.83B
Largest Holder
Blackrock, Inc.
Largest Position
$3.69B
Insider Transactions (90d)
23
Latest Filing Quarter
Q2 2026
New Institutional Positions
110
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.05% | 18,708,922 | $3,687,528,624 | $3,548,147,057 | -$139,381,567 | -3.78% | |
| Vanguard Portfolio Management Llc | 0.06% | 6,219,875 | $1,225,937,363 | $1,179,599,294 | -$46,338,069 | -3.78% | |
| Vanguard Capital Management Llc | 0.03% | 6,162,418 | $1,214,612,588 | $1,168,702,574 | -$45,910,014 | -3.78% | |
| Capital World Investors | 0.12% | 5,249,249 | $1,034,626,978 | $995,520,073 | -$39,106,905 | -3.78% | |
| State Street Corp | 0.03% | 5,237,299 | $1,032,271,633 | $993,253,755 | -$39,017,878 | -3.78% | |
| Capital Research Global Investors | 0.14% | 5,093,768 | $1,003,985,098 | $966,033,101 | -$37,951,997 | -3.78% | |
| Fmr Llc | 0.04% | 4,989,171 | $983,365,727 | $946,196,280 | -$37,169,447 | -3.78% | |
| Capital International Investors | 0.15% | 3,719,485 | $733,172,380 | $705,400,330 | -$27,772,050 | -3.79% | |
| Invesco Ltd. | 0.05% | 3,449,291 | $679,855,324 | $654,158,038 | -$25,697,286 | -3.78% | |
| Geode Capital Management, Llc | 0.03% | 2,777,512 | $547,575,303 | $526,755,151 | -$20,820,152 | -3.80% | |
| Qube Research & Technologies Ltd | 0.47% | 2,144,028 | $422,587,919 | $406,614,910 | -$15,973,009 | -3.78% | |
| Morgan Stanley | 0.02% | 1,865,178 | $367,627,031 | $353,731,008 | -$13,896,023 | -3.78% | |
| Bank Of America Corp | 0.02% | 1,767,047 | $348,284,956 | $335,120,464 | -$13,164,492 | -3.78% | |
| Norges Bank | 0.03% | 1,739,884 | $342,931,136 | $329,969,001 | -$12,962,135 | -3.78% | |
| Charles Schwab Investment Management Inc | 0.04% | 1,483,253 | $292,349,166 | $281,298,931 | -$11,050,235 | -3.78% | |
| Aqr Capital Management Llc | 0.10% | 1,432,935 | $282,431,527 | $271,756,123 | -$10,675,404 | -3.78% | |
| Jane Street Group, Llc | 0.18% | 1,410,930 | $278,094,304 | $267,582,875 | -$10,511,430 | -3.78% | |
| Northern Trust Corp | 0.03% | 1,288,597 | $253,982,469 | $244,382,421 | -$9,600,048 | -3.78% | |
| Point72 Asset Management, L.P. | 0.37% | 1,240,348 | $244,472,591 | $235,231,998 | -$9,240,593 | -3.78% | |
| Dimensional Fund Advisors Lp | 0.04% | 1,160,274 | $228,696,927 | $220,045,964 | -$8,650,963 | -3.78% | |
| Viking Global Investors | Ole Andreas Halvorsen | 0.65% | 1,153,880 | $227,429,748 | $218,833,342 | -$8,596,406 | -3.78% |
| Mirae Asset Global Etfs Holdings Ltd. | 0.26% | 1,120,952 | $220,940,581 | $212,588,547 | -$8,352,034 | -3.78% | |
| Price T Rowe Associates Inc | 0.02% | 1,021,799 | $201,398,000 | $193,784,180 | -$7,613,820 | -3.78% | |
| Dendur Capital Lp | 11.64% | 1,009,000 | $198,873,900 | $191,356,850 | -$7,517,050 | -3.78% | |
| Bessemer Group Inc | 0.26% | 954,983 | $188,227,000 | $181,112,526 | -$7,114,474 | -3.78% | |
| Bnp Paribas Financial Markets | 0.10% | 922,903 | $181,904,181 | $175,028,554 | -$6,875,627 | -3.78% | |
| Vanguard Fiduciary Trust Co | 0.04% | 881,293 | $173,702,850 | $167,137,217 | -$6,565,633 | -3.78% | |
| Millennium Management Llc | 0.12% | 875,260 | $172,513,746 | $165,993,059 | -$6,520,687 | -3.78% | |
| Fisher Asset Management, Llc | 0.05% | 872,372 | $171,944,620 | $165,445,350 | -$6,499,270 | -3.78% | |
| Ameriprise Financial Inc | 0.03% | 858,201 | $169,150,580 | $162,757,820 | -$6,392,760 | -3.78% | |
| Bank Of New York Mellon Corp | 0.03% | 857,414 | $168,996,204 | $162,608,565 | -$6,387,639 | -3.78% | |
| Artemis Investment Management Llp | 1.48% | 841,493 | $165,858,270 | $159,589,147 | -$6,269,123 | -3.78% | |
| Arrowstreet Capital, Limited Partnership | 0.07% | 839,786 | $165,521,821 | $159,265,415 | -$6,256,406 | -3.78% | |
| Polen Capital Management | David M. Polen | 1.39% | 819,236 | $161,471,378 | $155,368,107 | -$6,103,271 | -3.78% |
| D. E. Shaw & Co., Inc. | 0.10% | 815,585 | $160,751,804 | $154,675,695 | -$6,076,109 | -3.78% | |
| Bowen Hanes & Co Inc | 3.69% | 1,043,105 | $151,730,053 | $197,824,863 | +$46,094,810 | +30.38% | |
| American Century Companies Inc | 0.07% | 765,808 | $150,940,911 | $145,235,487 | -$5,705,424 | -3.78% | |
| Goldman Sachs Group Inc | 0.02% | 751,276 | $148,076,599 | $142,479,493 | -$5,597,106 | -3.78% | |
| Nuveen, Llc | 0.03% | 737,096 | $145,281,622 | $139,790,256 | -$5,491,366 | -3.78% | |
| Marshall Wace, Llp | 0.12% | 709,552 | $139,852,701 | $134,566,537 | -$5,286,164 | -3.78% | |
| Raymond James Financial Inc | 0.04% | 667,720 | $131,607,614 | $126,633,098 | -$4,974,516 | -3.78% | |
| Barrow Hanley Mewhinney & Strauss Llc | 0.39% | 658,413 | $129,773,203 | $124,868,025 | -$4,905,178 | -3.78% | |
| Assenagon Asset Management S.A. | 0.17% | 657,117 | $129,517,761 | $124,622,239 | -$4,895,522 | -3.78% | |
| Two Sigma Investments, Lp | 0.09% | 636,671 | $125,487,854 | $120,744,655 | -$4,743,199 | -3.78% | |
| Freestone Grove Partners Lp | 0.76% | 587,093 | $115,716,030 | $111,342,187 | -$4,373,843 | -3.78% | |
| Loomis Sayles & Co L P | 0.14% | 581,326 | $114,579,355 | $110,248,476 | -$4,330,879 | -3.78% | |
| Balyasny Asset Management L.P. | 0.19% | 514,088 | $101,326,745 | $97,496,789 | -$3,829,956 | -3.78% | |
| Holocene Advisors, Lp | 0.22% | 497,600 | $98,076,960 | $94,369,840 | -$3,707,120 | -3.78% | |
| Citadel Advisors Llc | 0.06% | 497,418 | $98,041,088 | $94,335,324 | -$3,705,764 | -3.78% | |
| Sg Americas Securities, Llc | 0.06% | 489,505 | $96,481,000 | $92,834,623 | -$3,646,377 | -3.78% |
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.