ATI INC (ATI) Institutional Ownership and Insiders Activity

ATI INC (ATI) is widely held by institutional investors, with 3 tracked firms reporting positions valued at approximately $485.73M based on SEC Form 13F filings for the quarter ended March 31, 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.