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ATI (ATI) Institutional Ownership

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$227.79 +0.57 (+0.25%)
As of 01:01 PM Eastern
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Institutional Ownership Changes (13F Filings) for ATI (NYSE:ATI)

Number of
Institutional Buyers
(last 12 months)
386
Total
Institutional Inflows
(last 12 months)
$6.67B
Number of
Institutional Sellers
(last 12 months)
218
Total
Institutional Outflows
(last 12 months)
$1.63B
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ATI Institutional Buying and Selling by Quarter

ATI Major Shareholders & Ownership History

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Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
8/14/2026S Squared Technology LLC40,000$7.88B2.4%N/A0.029%
8/14/2026Marathon Partners Equity Management LLC6,000$1.18M1.1%N/A0.004%
8/14/2026Cetera Trust Company N.A6,548$1.29M0.6%N/A0.005%
8/14/2026Paradigm Capital Management Inc. NY18,000$3.55M0.1%N/A0.013%
8/14/2026Algert Global LLC112,780$22.23M0.3%+5.2%0.083%
8/13/2026Gallo Partners LP2,974$586K1.3%N/A0.002%
8/13/2026Cibc World Market Inc.1,043$206K0.0%N/A0.001%
8/13/2026Tribune Investment Group LP29,380$5.79M2.3%N/A0.022%
8/13/2026Sanctuary Advisors LLC117,432$23.15M0.1%N/A0.086%
8/13/2026Connor Clark & Lunn Investment Management Ltd.21,561$4.25M0.0%N/A0.016%
8/13/2026Meiji Yasuda Asset Management Co Ltd.3,159$623K0.0%N/A0.002%
8/13/2026 Barrow Hanley Mewhinney & Strauss LLC658,413$129.77M0.4%N/A0.484%
8/13/2026 Globeflex Capital L P67,186$13.24M1.7%N/A0.049%
8/13/2026 Bank of Nova Scotia417,290$82.25M0.1%N/A0.306%
8/12/2026 Commerce Bank2,117$417K0.0%N/A0.002%
8/12/2026 Pinnbrook Capital Management LP82,081$16.18M1.7%N/A0.060%
8/12/2026 Northwestern Mutual Wealth Management Co.78,629$15.50M0.0%N/A0.058%
8/12/2026 Quantbot Technologies LP27,156$5.35M0.2%N/A0.020%
8/12/2026 Emerald Investment Advisers LLC4,468$881K0.1%N/A0.003%
8/12/2026 Landscape Capital Management L.L.C.7,649$1.51M0.1%N/A0.006%
8/12/2026 Rakuten Securities Inc.460$91K0.0%N/A0.000%
8/12/2026 Ieq Capital LLC66,949$13.20M0.1%N/A0.049%
8/12/2026 Callan Family Office LLC3,926$774K0.0%N/A0.003%
8/11/2026 Keating Financial Advisory Services Inc.694$137K0.0%N/A0.001%
8/11/2026 Allworth Financial LP2,840$560K0.0%N/A0.002%
8/11/2026 Greenspring Advisors LLC1,172$231K0.0%N/A0.001%
8/11/2026 Vise Technologies Inc.3,406$671K0.0%N/A0.002%
8/10/2026 Johnson Financial Group Inc.550$108K0.0%N/A0.000%
8/10/2026 NewEdge Wealth LLC3,985$785K0.0%N/A0.003%
8/10/2026 Danske Bank A S36,988$7.29M0.0%N/A0.027%
8/10/2026 Diversify Advisory Services LLC2,014$388K0.0%N/A0.001%
8/8/2026 Meeder Advisory Services Inc.1,385$273K0.0%N/A0.001%
8/8/2026 Meeder Asset Management Inc.389$77K0.0%N/A0.000%
8/7/2026 Citizens Financial Group Inc. RI2,328$459K0.0%N/A0.002%
8/7/2026 BlackRock Inc.18,708,922$3.69B0.1%N/A13.709%
8/7/2026 Pallas Capital Advisors LLC1,617$319K0.0%N/A0.001%
8/7/2026 Deutsche Bank AG162,592$32.05M0.0%N/A0.119%
8/7/2026 Perigon Wealth Management LLC2,256$445K0.0%N/A0.002%
8/7/2026 Mitsubishi UFJ Asset Management Co. Ltd.369$73K0.0%N/A0.000%
8/7/2026 OneDigital Investment Advisors LLC1,214$239K0.0%N/A0.001%
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8/7/2026 Old West Investment Management LLC12,555$2.48M0.3%N/A0.009%
8/6/2026 Global Retirement Partners LLC3,989$786K0.0%N/A0.003%
8/6/2026 Bank of New York Mellon Corp857,414$169.00M0.0%N/A0.628%
8/6/2026 Focus Partners Advisor Solutions LLC3,438$678K0.0%N/A0.003%
8/6/2026 State of Wyoming6,652$1.31M0.1%N/A0.005%
8/6/2026 Mivtachim The Workers Social Insurance Fund Ltd. Under Special Management 24,000$4.73M0.6%N/A0.018%
8/6/2026 GSA Capital Partners LLP8,292$1.63M0.1%N/A0.006%
8/5/2026USA Financial Formulas992$144K0.0%N/A0.001%
8/3/2026 Oppenheimer Asset Management Inc.14,532$2.86M0.0%N/A0.011%
7/20/2026 Graphene Investments SAS16,800$3.31M1.9%-15.6%0.012%
7/10/2026 Tema ETFs LLC72,045$14.20M0.5%-11.3%0.053%
7/9/2026 Arista Wealth Management LLC5,753$1.13M0.1%-37.6%0.004%
7/9/2026 Hennion & Walsh Asset Management Inc.36,829$7.26M0.2%+18.0%0.027%
7/8/2026 Thurston Springer Miller Herd & Titak Inc.2,886$569K0.2%N/A0.002%
7/8/2026 Assenagon Asset Management S.A.657,117$129.52M0.2%+12.5%0.482%
7/8/2026 55 North Private Wealth LLC1,195$236K0.0%N/A0.001%
7/7/2026 Dynamic Advisor Solutions LLC1,207$238K0.0%N/A0.001%
7/7/2026 GK Wealth Management LLC2,115$417K0.2%N/A0.002%
7/7/2026 GAMMA Investing LLC4,793$945K0.0%+23.0%0.004%
7/7/2026 Harbor Investment Advisory LLC581$115K0.0%N/A0.000%
7/7/2026 CoreCap Advisors LLC154$30K0.0%N/A0.000%
6/18/2026Pacer Advisors Inc.21,679$3.15M0.0%-64.5%0.016%
6/16/2026 PVG Asset Management Corp10,475$1.52M1.1%N/A0.008%
6/16/2026Empowered Funds LLC55,970$8.14M0.1%+304.6%0.041%
6/3/2026DV Trading LLC1,600$233K0.0%+100.0%0.001%
6/3/2026 NewEdge Advisors LLC3,969$577K0.0%+3,869.0%0.003%
6/2/2026 Optiver Holding B.V.1,226$178K0.0%N/A0.001%
5/22/2026 Segall Bryant & Hamill LLC277,371$40.35M0.5%-13.8%0.203%
5/19/2026Dayah Capital LLC9,842$1.43M0.5%-34.4%0.007%
5/19/2026Bank of America Corp DE1,364,941$198.54M0.0%+70.8%1.000%
5/19/2026 Edgestream Partners L.P.9,517$1.38M0.0%+17.2%0.007%
5/19/2026 Bull Harbor Capital LLC2,686$391K0.1%N/A0.002%
5/19/2026Strategic Investment Advisors MI1,214$177K0.0%N/A0.001%
5/19/2026 South Dakota Investment Council5,300$771K0.0%N/A0.004%
5/18/2026 Amundi261,186$37.99M0.0%+775.0%0.191%
5/18/2026 EverSource Wealth Advisors LLC3,756$546K0.0%-2.9%0.003%
5/18/2026California State Teachers Retirement System157,761$22.95M0.0%+21.0%0.116%
5/18/2026Royal Bank of Canada171,029$24.88M0.0%+124.3%0.125%
5/18/2026Rokos Capital Management LLP80,343$11.68M0.1%N/A0.059%
5/18/2026Empowered Funds LLC55,970$8.14M0.1%+304.6%0.041%
5/16/2026The Manufacturers Life Insurance Company69,568$10.12M0.0%-25.8%0.051%
5/16/2026Hawk Ridge Capital Management LP185,600$27.00M1.0%-11.4%0.136%
5/16/2026Quantinno Capital Management LP40,458$5.89M0.0%+22.7%0.030%
5/16/2026Lazard Asset Management LLC24,105$3.51M0.0%+281.4%0.018%
5/15/2026 Gateway Wealth Partners LLC3,439$500K0.0%N/A0.003%
5/15/2026Waverly Advisors LLC46,082$6.70M0.1%-23.0%0.034%
5/15/2026Epoch Investment Partners Inc.85,601$12.45M0.1%-5.2%0.063%
5/15/2026Entropy Technologies LP19,026$2.77M0.1%N/A0.014%
5/14/2026Healthcare of Ontario Pension Plan Trust Fund87,042$12.66M0.0%+62.8%0.064%
5/14/2026 Gabelli Funds LLC15,316$2.23M0.0%+11.8%0.011%
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5/14/2026 Gamco Investors INC. ET AL361,500$52.58M0.5%-5.6%0.265%
5/14/2026Public Employees Retirement System of Ohio39,930$5.81M0.0%-3.5%0.029%
5/14/2026 Compound Planning Inc.2,378$346K0.0%+15.5%0.002%
5/14/2026Arrowstreet Capital Limited Partnership1,203,726$175.09M0.1%+231.4%0.882%
5/14/2026 Inceptionr LLC1,546$225K0.1%-40.9%0.001%
5/14/2026Bowen Hanes & Co. Inc.1,043,105$151.73M3.7%-11.4%0.764%
5/14/2026 Bank of Nova Scotia467,149$67.95M0.1%+92.9%0.342%
5/14/2026Sei Investments Co.90,045$13.10M0.0%-24.7%0.066%
5/14/2026 Lido Advisors LLC5,110$743K0.0%+29.0%0.004%
5/14/2026 State of Wyoming2,882$419K0.0%-44.8%0.002%


ATI Institutional Ownership - Frequently Asked Questions

During the previous two years, 611 institutional investors and hedge funds held shares of ATI. The most heavily invested institutionals were S Squared Technology LLC ($7.88B), BlackRock Inc. ($3.69B), Capital International Investors ($1.96B), Vanguard Group Inc. ($1.46B), Capital World Investors ($844.15M), State Street Corp ($642.57M), and Capital Research Global Investors ($414.48M).Learn more on ATI's institutional investors.

Of the 552 institutional investors that purchased ATI's stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: BlackRock Inc. ($18.71M), Mountaineer Partners Management LLC ($9.26M), Norges Bank ($4.98M), Capital World Investors ($4.53M), Dendur Capital LP ($3.06M), Vanguard Group Inc. ($2.02M), and Holocene Advisors LP ($1.82M).

Institutional investors have bought a total of 43,784,946 shares in the last 24 months. This purchase volume represents approximately $6.67B in transactions.

Of the 213 institutional investors that sold ATI's stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: Ameriprise Financial Inc. ($1.60M), Royal Bank of Canada ($1.21M), Channing Capital Management LLC ($1.00M), Dimensional Fund Advisors LP ($775.20K), Dendur Capital LP ($649.87K), Voloridge Investment Management LLC ($646.96K), and Vanguard Group Inc. ($603.95K).

Institutional investors have sold a total of 15,310,945 shares in the last 24 months. This volume of shares sold represents approximately $1.63B in transactions.


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Institutional ownership data for NYSE:ATI is compiled from quarterly 13F filings submitted to the U.S. Securities and Exchange Commission (SEC), with the most recent received on 8/14/2026. New 13F filings are added each quarter as they're published.
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