ATI INC (ATI) Institutional Ownership and Insiders Activity

ATI INC (ATI) is widely held by institutional investors, with 4 tracked firms reporting positions valued at approximately $652.98M based on SEC Form 13F filings for the quarter ended June 30, 2026.

Viking Global Investors is the largest disclosed holder, reporting approximately $484.80M in ATI holdings in its latest filing.

Institutional ownership among tracked investors remains highly concentrated, with Viking Global Investors representing the majority of disclosed value.

Recent insider activity includes 28 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.