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ATI (ATI) Institutional Ownership

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$184.16 -2.40 (-1.29%)
Closing price 03:59 PM Eastern
Extended Trading
$186.20 +2.05 (+1.11%)
As of 06:24 PM Eastern
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Institutional Ownership Changes (13F Filings) for ATI (NYSE:ATI)

Number of
Institutional Buyers
(last 12 months)
393
Total
Institutional Inflows
(last 12 months)
$7.29B
Number of
Institutional Sellers
(last 12 months)
216
Total
Institutional Outflows
(last 12 months)
$1.52B
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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
9/18/2026 Security National Bank of Sioux City Iowa IA600$118K0.0%N/A0.000%
9/9/2026 Sequoia Financial Advisors LLC33,554$6.61M0.0%+485.8%0.025%
9/9/2026 Tidal Investments LLC91,436$18.02M0.0%-11.8%0.067%
9/9/2026 Arlington Capital Management Inc.1,211$239K0.1%N/A0.001%
9/9/2026 WINTON GROUP Ltd13,394$2.64M0.1%+50.5%0.010%
9/9/2026 Engineers Gate Manager LP87,049$17.16M0.2%+26.3%0.064%
9/9/2026 Integrated Wealth Concepts LLC5,890$1.16M0.0%+7.8%0.004%
9/9/2026 NewEdge Advisors LLC5,967$1.18M0.0%+50.3%0.004%
9/9/2026 Baird Financial Group Inc.1,779$351K0.0%-8.3%0.001%
9/8/2026 Allworth Financial LP2,840$560K0.0%+15.7%0.002%
9/8/2026 Arizona State Retirement System37,654$7.42M0.0%+0.9%0.028%
9/8/2026 Waverly Advisors LLC44,418$8.76M0.1%-3.6%0.033%
9/8/2026 Nykredit A S3,855$760K0.0%N/A0.003%
9/4/2026 Parkside Financial Bank & Trust610$120K0.0%+28.4%0.000%
8/27/2026 Corient Private Wealth LP78,728$15.52M0.0%+578.2%0.058%
8/26/2026 Amundi388,616$76.60M0.0%+48.8%0.285%
8/26/2026 HighTower Advisors LLC31,264$6.16M0.0%-8.2%0.023%
8/25/2026 VIRGINIA RETIREMENT SYSTEMS ET Al23,828$4.70M0.0%N/A0.017%
8/23/2026 Ameritas Advisory Services LLC1,658$327K0.0%N/A0.001%
8/23/2026 Wedmont Private Capital2,198$411K0.0%+13.2%0.002%
8/23/2026 HB Wealth Management LLC4,979$981K0.0%+20.9%0.004%
8/23/2026 Nilsine Partners LLC25,713$5.07M0.4%+2.7%0.019%
8/23/2026 Angeles Wealth Management LLC1,220$240K0.0%N/A0.001%
8/22/2026 AlphaGrep UK Ltd4,725$931K0.3%N/A0.003%
8/22/2026 Oakmont Investment Advisors Inc.5,371$1.06M0.7%N/A0.004%
8/22/2026 Three Seasons Wealth LLC1,190$235K0.0%N/A0.001%
8/22/2026 TD Waterhouse Canada Inc.2,515$483K0.0%-67.1%0.002%
8/22/2026 Concurrent Investment Advisors LLC6,808$1.34M0.0%+9.8%0.005%
8/21/2026 AXQ Capital LP18,637$3.67M0.4%-14.1%0.014%
8/21/2026 Greenspring Advisors LLC1,172$231K0.0%N/A0.001%
8/21/2026 Nykredit A S3,855$760K0.0%N/A0.003%
8/21/2026 Triumph Capital Management317$62K0.0%+22.4%0.000%
8/20/2026 Headlands Technologies LLC8,300$1.64M0.2%+152.5%0.006%
8/20/2026 Senator Investment Group LP80,000$15.77M0.6%-44.8%0.059%
8/20/2026 Quantitative Investment Management LLC1,953$384K0.0%-9.5%0.001%
8/20/2026 Susquehanna Fundamental Investments LLC95,495$18.82M0.4%+15.4%0.070%
8/20/2026 Moore Capital Management LP30,927$6.10M0.1%-8.8%0.023%
8/20/2026 Sigma Planning Corp4,934$972K0.0%-53.1%0.004%
8/20/2026 Two Sigma Securities LLC2,646$522K0.0%-40.9%0.002%
8/20/2026 Cookson Peirce & Co. Inc.45,845$9.04M0.3%+58.4%0.034%
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8/20/2026 Northwestern Mutual Wealth Management Co.78,629$15.50M0.0%-0.9%0.058%
8/20/2026 Rational Advisors Inc.14,100$2.78M0.3%+104.3%0.010%
8/20/2026 Greenleaf Trust1,286$253K0.0%N/A0.001%
8/19/2026 UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC428,271$84.41M0.0%+20.7%0.315%
8/19/2026 Toth Financial Advisory Corp5,609$1.11M0.1%+124.4%0.004%
8/19/2026 Van ECK Associates Corp27,953$5.51M0.0%N/A0.021%
8/19/2026 Hsbc Holdings PLC65,083$12.82M0.0%+126.1%0.048%
8/19/2026 Wellington Management Group LLP81,401$16.04M0.0%+7.5%0.060%
8/19/2026 Archer Investment Corp1,510$298K0.0%N/A0.001%
8/18/2026 Beacon Pointe Advisors LLC1,680$331K0.0%N/A0.001%
8/18/2026 Empowered Funds LLC91,374$18.01M0.1%N/A0.067%
8/18/2026 United Capital Financial Advisors LLC1,687$333K0.0%N/A0.001%
8/18/2026 Public Employees Retirement System of Ohio40,142$7.91M0.0%N/A0.029%
8/17/2026 Capstone Investment Advisors LLC10,849$2.14M0.0%N/A0.008%
8/17/2026 Corient Private Wealth LP67,987$13.40M0.0%N/A0.050%
8/17/2026 Ausdal Financial Partners Inc.2,127$419K0.0%N/A0.002%
8/17/2026 Bank of America Corp DE1,767,047$348.29M0.0%N/A1.298%
8/15/2026 Freestone Grove Partners LP587,093$115.72M0.7%N/A0.431%
8/15/2026 Caisse de depot et placement du Quebec1,800$355K0.0%N/A0.001%
8/15/2026 Man Group plc59,556$11.74M0.0%N/A0.044%
8/15/2026 Jupiter Topco LLC60,508$11.92M0.0%N/A0.044%
8/14/2026 Hsbc Holdings PLC65,083$12.82M0.0%N/A0.048%
8/14/2026 EFG International AG719$142K0.0%N/A0.001%
8/14/2026 Expect Equity LLC22,645$4.46M2.9%N/A0.017%
8/14/2026 Canada Pension Plan Investment Board321,526$63.37M0.0%N/A0.236%
8/14/2026 Castleark Management LLC4,830$952K0.0%N/A0.004%
8/14/2026 Legal & General Group Plc199,420$39.31M0.0%N/A0.146%
8/14/2026 The Manufacturers Life Insurance Company64,289$12.67M0.0%N/A0.047%
8/14/2026 S Squared Technology LLC40,000$7.88M0.0%N/A0.029%
8/14/2026 Marathon Partners Equity Management LLC6,000$1.18M1.1%N/A0.004%
8/14/2026 Cetera Trust Company N.A6,548$1.29M0.6%N/A0.005%
8/14/2026 Paradigm Capital Management Inc. NY18,000$3.55M0.1%N/A0.013%
8/14/2026 Algert Global LLC112,780$22.23M0.3%+5.2%0.083%
8/13/2026 Gallo Partners LP2,974$586K1.3%N/A0.002%
8/13/2026 Cibc World Market Inc.1,043$206K0.0%N/A0.001%
8/13/2026 Tribune Investment Group LP29,380$5.79M2.3%-8.2%0.022%
8/13/2026 Sanctuary Advisors LLC117,432$23.15M0.1%N/A0.086%
8/13/2026 Connor Clark & Lunn Investment Management Ltd.21,561$4.25M0.0%N/A0.016%
8/13/2026 Meiji 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%
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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%


ATI Institutional Ownership - Frequently Asked Questions

During the previous two years, 627 institutional investors and hedge funds held shares of ATI. The most heavily invested institutionals were BlackRock Inc. ($3.69B), Capital International Investors ($1.96B), Vanguard Group Inc. ($1.46B), Capital World Investors ($844.15M), State Street Corp ($642.57M), Capital Research Global Investors ($414.48M), and Invesco Ltd. ($388.45M).Learn more on ATI's institutional investors.

Of the 563 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), Bank of America Corp DE ($2.44M), and Vanguard Group Inc. ($2.02M).

Institutional investors have bought a total of 46,083,161 shares in the last 24 months. This purchase volume represents approximately $7.29B in transactions.

Of the 216 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: Royal Bank of Canada ($1.21M), Channing Capital Management LLC ($1.00M), Ameriprise Financial Inc. ($795.00K), 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 13,854,985 shares in the last 24 months. This volume of shares sold represents approximately $1.52B 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 9/18/2026. New 13F filings are added each quarter as they're published.
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