Canonical: https://ownershiptrace.com/13f/companies/482

# Who owns ATI INC (AT)? Elite investor 13F holders

7 tracked elite investors reported holding ATI INC as of 2026-06-30, including Viking Global Investors, D.E. Shaw, Polen Capital Management, GAMCO, Gotham Asset Management. Who bought, trimmed or exited each quarter, with links to the original SEC 13F filings.

7 tracked investors currently reported holding · Latest report period: 2026-06-30 · Materials · Materials

ATI Inc. produces and sells specialty materials and complex components worldwide. It operates in two segments, High Performance Materials & Components, and Advanced Alloys & Solutions. The company produces high performance materials, including titanium and titanium-based alloys, nickel- and cobalt-based alloys and superalloys, advanced powder alloys and other specialty materials, and metallic…

## Reported holders and securities, including exits (up to 20)

| Investor | Security | Instrument | Report period | Filed | Value | Quantity | Units | Change | Source |
|  --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| [Viking Global Investors](https://ownershiptrace.com/13f/investors/81) | ALLEGHENY TECHNOLOGIES INC | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 227429748.00 USD | 1153880.000000 | Shares | reduce | [Original filing](https://www.sec.gov/Archives/edgar/data/1103804/0001103804-26-000006-index.html) |
| [D.E. Shaw](https://ownershiptrace.com/13f/investors/98) | ALLEGHENY TECHNOLOGIES INC | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 160751804.00 USD | 815585.000000 | Shares | reduce | [Original filing](https://www.sec.gov/Archives/edgar/data/1009207/0001104659-26-097217-index.html) |
| [Polen Capital Management](https://ownershiptrace.com/13f/investors/61) | ALLEGHENY TECHNOLOGIES INC | SHARE | 2026-06-30 | 2026-08-04 00:00:00 | 161471378.00 USD | 819236.000000 | Shares | buy | [Original filing](https://www.sec.gov/Archives/edgar/data/1034524/0001172661-26-003035-index.html) |
| [GAMCO](https://ownershiptrace.com/13f/investors/137) | ALLEGHENY TECHNOLOGIES INC | SHARE | 2026-06-30 | 2026-08-12 00:00:00 | 70561800.00 USD | 358000.000000 | Shares | reduce | [Original filing](https://www.sec.gov/Archives/edgar/data/807249/0001140361-26-032508-index.html) |
| [Gotham Asset Management](https://ownershiptrace.com/13f/investors/94672) | ALLEGHENY TECHNOLOGIES INC | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 53132641.00 USD | 269572.000000 | Shares | add | [Original filing](https://www.sec.gov/Archives/edgar/data/1510387/0001398344-26-014644-index.html) |
| [Tudor Investment](https://ownershiptrace.com/13f/investors/94675) | ALLEGHENY TECHNOLOGIES INC | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 29296550.00 USD | 148638.000000 | Shares | add | [Original filing](https://www.sec.gov/Archives/edgar/data/923093/0000902664-26-003485-index.html) |
| [Bridgewater Associates](https://ownershiptrace.com/13f/investors/8) | ALLEGHENY TECHNOLOGIES INC | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 22654674.00 USD | 114940.000000 | Shares | add | [Original filing](https://www.sec.gov/Archives/edgar/data/1350694/0001350694-26-000003-index.html) |
| [Ancora Advisors / Ancora Holdings](https://ownershiptrace.com/13f/investors/101) | ALLEGHENY TECHNOLOGIES INC | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 0.00 USD | 0.000000 | Shares | exited | [Original filing](https://www.sec.gov/Archives/edgar/data/1446114/0001446114-26-000012-index.html) |

Public disclosures can be delayed, incomplete, or amended. Report period describes a position date; transaction date describes a reported transaction; filed describes submission. A recent filing or page update does not establish a current holding. A dash means unavailable or not comparable, not zero.

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