ATI Institutional Ownership & Shareholders
ATI INC (ATI) is currently held by 811 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $24.95B 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 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 $3.10B, representing an estimated loss of -15.99% 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
811
Total Reported Value
$24.95B
Largest Holder
Blackrock, Inc.
Largest Position
$3.69B
Insider Transactions (90d)
11
Latest Filing Quarter
Q2 2026
New Institutional Positions
75
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 | $3,098,010,394 | -$589,518,230 | -15.99% | |
| Vanguard Portfolio Management Llc | 0.06% | 6,219,875 | $1,225,937,363 | $1,029,949,101 | -$195,988,262 | -15.99% | |
| Vanguard Capital Management Llc | 0.03% | 6,162,418 | $1,214,612,588 | $1,020,434,797 | -$194,177,791 | -15.99% | |
| Capital World Investors | 0.12% | 5,249,249 | $1,034,626,978 | $869,223,142 | -$165,403,836 | -15.99% | |
| State Street Corp | 0.03% | 5,237,299 | $1,032,271,633 | $867,244,341 | -$165,027,292 | -15.99% | |
| Capital Research Global Investors | 0.14% | 5,093,768 | $1,003,985,098 | $843,477,043 | -$160,508,055 | -15.99% | |
| Fmr Llc | 0.04% | 4,989,171 | $983,365,727 | $826,156,826 | -$157,208,901 | -15.99% | |
| Capital International Investors | 0.15% | 3,719,485 | $733,172,380 | $615,909,521 | -$117,262,859 | -15.99% | |
| Invesco Ltd. | 0.05% | 3,449,291 | $679,855,324 | $571,168,097 | -$108,687,227 | -15.99% | |
| Geode Capital Management, Llc | 0.03% | 2,777,512 | $547,575,303 | $459,928,212 | -$87,647,091 | -16.01% | |
| Qube Research & Technologies Ltd | 0.47% | 2,144,028 | $422,587,919 | $355,029,597 | -$67,558,322 | -15.99% | |
| Morgan Stanley | 0.02% | 1,865,178 | $367,627,031 | $308,854,825 | -$58,772,206 | -15.99% | |
| Bank Of America Corp | 0.02% | 1,767,047 | $348,284,956 | $292,605,313 | -$55,679,643 | -15.99% | |
| Norges Bank | 0.03% | 1,739,884 | $342,931,136 | $288,107,392 | -$54,823,744 | -15.99% | |
| Charles Schwab Investment Management Inc | 0.04% | 1,483,253 | $292,349,166 | $245,611,864 | -$46,737,302 | -15.99% | |
| Aqr Capital Management Llc | 0.10% | 1,432,935 | $282,431,527 | $237,279,707 | -$45,151,820 | -15.99% | |
| Jane Street Group, Llc | 0.18% | 1,410,930 | $278,094,304 | $233,635,899 | -$44,458,405 | -15.99% | |
| Northern Trust Corp | 0.03% | 1,288,597 | $253,982,469 | $213,378,777 | -$40,603,692 | -15.99% | |
| Point72 Asset Management, L.P. | 0.37% | 1,240,348 | $244,472,591 | $205,389,225 | -$39,083,366 | -15.99% | |
| Dimensional Fund Advisors Lp | 0.04% | 1,160,274 | $228,696,927 | $192,129,772 | -$36,567,155 | -15.99% | |
| Viking Global Investors | Ole Andreas Halvorsen | 0.65% | 1,153,880 | $227,429,748 | $191,070,989 | -$36,358,759 | -15.99% |
| Mirae Asset Global Etfs Holdings Ltd. | 0.26% | 1,120,952 | $220,940,581 | $185,618,442 | -$35,322,139 | -15.99% | |
| Price T Rowe Associates Inc | 0.02% | 1,021,799 | $201,398,000 | $169,199,696 | -$32,198,304 | -15.99% | |
| Dendur Capital Lp | 11.64% | 1,009,000 | $198,873,900 | $167,080,310 | -$31,793,590 | -15.99% | |
| Bessemer Group Inc | 0.26% | 954,983 | $188,227,000 | $158,135,635 | -$30,091,365 | -15.99% | |
| Bnp Paribas Financial Markets | 0.10% | 922,903 | $181,904,181 | $152,823,508 | -$29,080,673 | -15.99% | |
| Vanguard Fiduciary Trust Co | 0.04% | 881,293 | $173,702,850 | $145,933,308 | -$27,769,542 | -15.99% | |
| Millennium Management Llc | 0.12% | 875,260 | $172,513,746 | $144,934,303 | -$27,579,443 | -15.99% | |
| Fisher Asset Management, Llc | 0.05% | 872,372 | $171,944,620 | $144,456,079 | -$27,488,541 | -15.99% | |
| Ameriprise Financial Inc | 0.03% | 858,201 | $169,150,580 | $142,109,504 | -$27,041,076 | -15.99% | |
| Bank Of New York Mellon Corp | 0.03% | 857,414 | $168,996,204 | $141,979,184 | -$27,017,020 | -15.99% | |
| Arrowstreet Capital, Limited Partnership | 0.07% | 839,786 | $165,521,821 | $139,060,164 | -$26,461,657 | -15.99% | |
| Artemis Investment Management Llp | 1.41% | 854,431 | $161,829,231 | $141,485,229 | -$20,344,002 | -12.57% | |
| Polen Capital Management | David M. Polen | 1.39% | 819,236 | $161,471,378 | $135,657,289 | -$25,814,089 | -15.99% |
| D. E. Shaw & Co., Inc. | 0.10% | 815,585 | $160,751,804 | $135,052,720 | -$25,699,084 | -15.99% | |
| Assenagon Asset Management S.A. | 0.16% | 837,941 | $158,706,025 | $138,754,650 | -$19,951,375 | -12.57% | |
| Bowen Hanes & Co Inc | 3.69% | 1,043,105 | $151,730,053 | $172,727,757 | +$20,997,704 | +13.84% | |
| American Century Companies Inc | 0.07% | 765,808 | $150,940,911 | $126,810,147 | -$24,130,764 | -15.99% | |
| Goldman Sachs Group Inc | 0.02% | 751,276 | $148,076,599 | $124,403,793 | -$23,672,806 | -15.99% | |
| Nuveen, Llc | 0.03% | 737,096 | $145,281,622 | $122,055,727 | -$23,225,895 | -15.99% | |
| Marshall Wace, Llp | 0.12% | 709,552 | $139,852,701 | $117,494,716 | -$22,357,985 | -15.99% | |
| Raymond James Financial Inc | 0.04% | 667,720 | $131,607,614 | $110,567,755 | -$21,039,859 | -15.99% | |
| Barrow Hanley Mewhinney & Strauss Llc | 0.39% | 658,413 | $129,773,203 | $109,026,609 | -$20,746,594 | -15.99% | |
| Two Sigma Investments, Lp | 0.09% | 636,671 | $125,487,854 | $105,426,351 | -$20,061,503 | -15.99% | |
| Freestone Grove Partners Lp | 0.76% | 587,093 | $115,716,030 | $97,216,730 | -$18,499,300 | -15.99% | |
| Loomis Sayles & Co L P | 0.14% | 581,326 | $114,579,355 | $96,261,772 | -$18,317,583 | -15.99% | |
| Balyasny Asset Management L.P. | 0.19% | 514,088 | $101,326,745 | $85,127,832 | -$16,198,913 | -15.99% | |
| Holocene Advisors, Lp | 0.22% | 497,600 | $98,076,960 | $82,397,584 | -$15,679,376 | -15.99% | |
| Citadel Advisors Llc | 0.06% | 497,418 | $98,041,088 | $82,367,447 | -$15,673,641 | -15.99% | |
| Sg Americas Securities, Llc | 0.06% | 489,505 | $96,481,000 | $81,057,133 | -$15,423,867 | -15.99% |
Frequently asked questions about ATI
Who are the largest institutional holders of ATI?
The largest institutional holders of ATI reported in the latest SEC Form 13F filings include Blackrock, Inc., Vanguard Portfolio Management Llc, Vanguard Capital Management Llc, Capital World Investors, and State Street Corp. InsiderSet ranks institutional holders by their latest reported ATI position.
What is ATI institutional ownership?
This page tracks ATI positions reported by institutional investment managers through SEC Form 13F. ATI INC (ATI) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own ATI?
InsiderSet currently tracks 811 institutional managers reporting ATI 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 ATI shareholders.
How much ATI stock do institutions own?
Institutional investment managers disclosed approximately $24.95B in ATI holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was ATI institutional ownership last updated?
The latest ATI 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 ATI 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 ATI position after the reporting date.
Are institutions buying or selling ATI?
Institutional buying and selling can be analyzed by comparing ATI positions across consecutive 13F reporting periods. InsiderSet's ATI Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View ATI ownership changes.
How has ATI institutional ownership changed over time?
InsiderSet tracks ATI institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.