ATI INC (ATI) Institutional Ownership Changes & 13F Activity

ATI INC (ATI). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings. This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Viking Global Investors, Sequoia Financial Advisors, ARK Invest, Renaissance Technologies LLC, and Alta Fox Capital Management.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2026Viking Global InvestorsBuy3,332,8433,332,843$484,795,343
Q1 2026Sequoia Financial AdvisorsSell-1,2485,728$833,195
Q1 2026ARK InvestSell-210679$98,767
Q4 2025Sequoia Financial AdvisorsBuy2,5526,976$800,566
Q4 2025ARK InvestBuy147889$102,022
Q3 2025Renaissance Technologies LLCSell-221,700259,992$21,147,749
Q3 2025ARK InvestBuy587742$60,354
Q3 2025Sequoia Financial AdvisorsBuy1024,424$359,849
Q2 2025Renaissance Technologies LLCBuy307,800481,692$41,589,287
Q2 2025ARK InvestSell-1,390155$13,383
Q2 2025Sequoia Financial AdvisorsBuy1444,322$373,162
Q1 2025Alta Fox Capital ManagementBuy216,300216,300$11,254,089
Q1 2025Renaissance Technologies LLCSell-4,300173,892$9,047,601
Q1 2025Sequoia Financial AdvisorsSell-8174,178$217,382
Q1 2025ARK InvestBuy1201,545$80,386
Q4 2024Renaissance Technologies LLCBuy90,000178,192$9,807,688
Q4 2024Sequoia Financial AdvisorsSell-3884,995$274,925
Q4 2024ARK InvestSell-2471,425$78,432
Q3 2024Renaissance Technologies LLCSell-92,00088,192$5,900,927
Q3 2024ARK InvestSell-6951,672$111,874
Q3 2024Sequoia Financial AdvisorsBuy1725,383$360,178
Q2 2024Renaissance Technologies LLCBuy44,600180,192$9,991,646
Q2 2024ARK InvestSell-9242,367$131,250
Q2 2024Sequoia Financial AdvisorsSell-175,211$288,950
Q1 2024Renaissance Technologies LLCBuy20,100135,592$6,938
Q1 2024ARK InvestSell-5913,291$168,400
Q1 2024Sequoia Financial AdvisorsBuy85,228$267,517
Q4 2023Sequoia Financial AdvisorsSell-4285,220$237,354
Q4 2023ARK InvestSell-3193,882$176,515
Q3 2023Renaissance Technologies LLCSell-70,008115,492$4,752

Frequently asked questions about ATI activity

  • Which institutional owners are buying ATI?

    Institutional owners buying ATI include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in ATI activity?

    "Buy" means an investor increased their reported position in ATI compared to the prior reporting period. This reflects growing exposure to ATI INC (ATI) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in ATI increasing?

    Institutional interest in ATI can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.

Related ATI Institutional Insights

ATI Institutional Ownership Changes and 13F Activity Q1 2026 | InsiderSet