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Amentum (AMTM) Institutional Ownership

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$21.64 -0.02 (-0.11%)
Closing price 06/18/2026 03:59 PM Eastern
Extended Trading
$21.51 -0.13 (-0.59%)
As of 06/18/2026 07:53 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Massive. Learn more.
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Institutional Ownership Changes (13F Filings) for Amentum (NYSE:AMTM)

Current
Institutional Ownership
Percentage
39.93%
Number of
Institutional Buyers
(last 12 months)
264
Total
Institutional Inflows
(last 12 months)
$1.40B
Number of
Institutional Sellers
(last 12 months)
136
Total
Institutional Outflows
(last 12 months)
$539.07M
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Skip Chart & View Institutional Buying and Selling Data

AMTM Institutional Buying and Selling by Quarter

Amentum Major Shareholders & Ownership History

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Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
6/16/2026 Empowered Funds LLC7,900$206K0.0%N/A0.003%
6/8/2026 Pine Valley Investments Ltd Liability Co79,275$2.07M0.1%+4.5%0.032%
5/27/2026 Alpine Woods Capital Investors LLC8,402$219K0.1%N/A0.003%
5/19/2026 Western Wealth Management LLC1,252$33K0.0%N/A0.001%
5/19/2026 Rovida Investment Management Ltd315,000$8.21M1.0%N/A0.129%
5/19/2026 Bank of America Corp DE2,405,041$62.72M0.0%+107.8%0.984%
5/18/2026 California State Teachers Retirement System184,555$4.81M0.0%+23.1%0.076%
5/18/2026 Royal Bank of Canada231,742$6.04M0.0%-13.1%0.095%
5/18/2026 Ruane Cunniff & Goldfarb L.P.1,622,982$42.33M0.7%-32.2%0.664%
5/18/2026 Empowered Funds LLC7,900$206K0.0%N/A0.003%
5/16/2026 The Manufacturers Life Insurance Company 40,917$1.07M0.0%+10.8%0.017%
5/16/2026 Maverick Capital Ltd.46,335$1.21M0.0%N/A0.019%
5/16/2026 Quantinno Capital Management LP145,574$3.80M0.0%+86.7%0.060%
5/15/2026 Troluce Capital Advisors LLC1,000,000$26.08M1.6%N/A0.409%
5/15/2026 Entropy Technologies LP26,895$701K0.0%N/A0.011%
5/14/2026 Gabelli Funds LLC69,783$1.82M0.0%+226.3%0.029%
5/14/2026 Gamco Investors INC. ET AL95,331$2.49M0.0%+3.8%0.039%
5/14/2026 Public Employees Retirement System of Ohio47,842$1.25M0.0%-2.8%0.020%
5/14/2026 Sei Investments Co.294,668$7.69M0.0%+35.8%0.121%
5/14/2026 State of Wyoming8,302$217K0.0%-30.3%0.003%
5/13/2026 Cetera Investment Advisers24,375$636K0.0%+14.6%0.010%
5/13/2026 CI Investments Inc.420,068$10.96M0.1%-1.3%0.172%
5/13/2026 First Trust Advisors LP228,083$5.95M0.0%-39.6%0.094%
5/8/2026 PNC Financial Services Group Inc.13,674$357K0.0%+8.3%0.006%
5/7/2026 Dimensional Fund Advisors LP3,787,420$98.77M0.0%+106.6%1.553%
5/7/2026 Hahn Capital Management LLC51,120$1.33M0.8%-17.5%0.021%
5/7/2026 KBC Group NV5,431$142K0.0%-7.1%0.002%
5/7/2026 Swiss National Bank313,391$8.17M0.0%+0.5%0.128%
5/6/2026 California Public Employees Retirement System277,052$7.23M0.0%-0.6%0.114%
5/6/2026 Gryphon Financial Partners LLC18,883$492K0.1%+16.0%0.008%
5/6/2026 Modera Wealth Management LLC18,402$480K0.0%-16.1%0.008%
5/6/2026 Bessemer Group Inc.125,952$3.28M0.0%+7,142.8%0.052%
5/5/2026 Bank of New York Mellon Corp908,599$23.70M0.0%-1.5%0.372%
5/5/2026 Illinois Municipal Retirement Fund83,407$2.18M0.0%N/A0.034%
5/5/2026 NFSG Corp1,350$35K0.0%N/A0.001%
5/4/2026 Bryn Mawr Trust Advisors LLC116,871$3.05M0.1%+14.6%0.048%
5/4/2026 Principal Financial Group Inc.744,728$19.42M0.0%+2.2%0.305%
5/1/2026 Fifth Third Bancorp273,316$7.13M0.0%+10,456.8%0.112%
4/28/2026 Intrinsic Value Partners LLC13,899$362K0.3%-16.7%0.006%
4/28/2026 Stephens Inc. AR23,395$610K0.0%+3.7%0.010%
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4/27/2026 Moran Wealth Management LLC19,585$511K0.0%N/A0.008%
4/27/2026 PFG Investments LLC10,332$269K0.0%+9.6%0.004%
4/27/2026 New York State Teachers Retirement System165,329$4.31M0.0%-0.4%0.068%
4/23/2026 Formidable Asset Management LLC13,473$351K0.1%+88.1%0.006%
4/22/2026 Janney Montgomery Scott LLC12,728$332K0.0%N/A0.005%
4/22/2026 Pictet Asset Management Holding SA26,893$701K0.0%+6.5%0.011%
4/22/2026 Sterling Capital Management LLC14,408$376K0.0%-18.0%0.006%
4/21/2026 Louisiana State Employees Retirement System68,200$1.78M0.0%N/A0.028%
4/20/2026 Delphi Management Inc. MA37,873$988K1.2%-22.9%0.016%
4/20/2026 Legal Advantage Investments Inc.28,900$754K0.4%+52.9%0.012%
4/17/2026 Telos Capital Management Inc.189,901$4.95M0.5%+1.3%0.078%
4/16/2026 SG Americas Securities LLC274,602$7.16M0.0%-20.5%0.113%
4/15/2026 Weatherly Asset Management L. P.9,690$253K0.0%N/A0.004%
3/17/2026 Rockefeller Capital Management L.P.4,412$128K0.0%-22.5%0.002%
3/9/2026 Corient Private Wealth LLC36,949$1.07M0.0%-5.4%0.015%
2/26/2026 Alpine Global Management LLC25,000$725K0.1%-66.7%0.010%
2/25/2026 Hahn Capital Management LLC61,962$1.80M1.0%-5.8%0.025%
2/19/2026 Invesco Ltd.21,834,003$633.19M0.1%-1.3%8.951%
2/19/2026 Corient Private Wealth LLC36,872$1.07M0.0%-5.6%0.015%
2/18/2026 Mercer Global Advisors Inc. ADV15,502$453K0.0%N/A0.006%
2/18/2026 Vident Advisory LLC382,540$11.09M0.1%-15.9%0.157%
2/18/2026 State of Tennessee Department of Treasury46,262$1.34M0.0%-28.7%0.019%
2/18/2026 Mackenzie Financial Corp15,479$453K0.0%N/A0.006%
2/18/2026 XTX Topco Ltd44,821$1.30M0.0%-9.0%0.018%
2/18/2026 Utah Retirement Systems8,339$242K0.0%N/A0.003%
2/18/2026 Wellington Management Group LLP18,948$549K0.0%-3.8%0.008%
2/18/2026 Symmetry Investments LP10,000$290K0.0%N/A0.004%
2/18/2026 Twinbeech Capital LP137,453$3.99M0.3%-38.3%0.056%
2/18/2026 Susquehanna Fundamental Investments LLC219,931$6.38M0.2%+304.8%0.090%
2/18/2026 Oxford Asset Management LLP18,629$540K0.2%N/A0.008%
2/18/2026 Old West Investment Management LLC19,355$561K0.1%N/A0.008%
2/18/2026 Millennium Management LLC61,187$1.77M0.0%-90.5%0.025%
2/18/2026 Moore Capital Management LP475,314$13.78M0.2%+16.7%0.195%
2/18/2026 Gotham Asset Management LLC635,430$18.43M0.1%+159.5%0.260%
2/18/2026 Aristotle Capital Boston LLC358,867$10.41M0.6%-12.3%0.147%
2/18/2026 Balyasny Asset Management L.P.267,999$7.77M0.0%+644.2%0.110%
2/18/2026 Boothbay Fund Management LLC7,214$209K0.0%N/A0.003%
2/18/2026 American Trust Investment Advisors LLC29,175$846K0.5%-4.3%0.012%
2/18/2026 683 Capital Management LLC835,000$24.22M1.1%-34.5%0.342%
2/17/2026 Guggenheim Capital LLC9,439$274K0.0%N/A0.004%
2/17/2026 AQR Capital Management LLC1,452,049$42.11M0.0%+778.9%0.595%
2/17/2026 Cetera Investment Advisers21,274$617K0.0%-8.3%0.009%
2/17/2026 FIL Ltd1,429,384$41.45M0.0%-8.3%0.586%
2/17/2026 Price T Rowe Associates Inc. MD129,482$3.76M0.0%+9.6%0.053%
2/17/2026 Soviero Asset Management LP178,000$5.16M2.5%+14.8%0.073%
2/17/2026 Osaic Holdings Inc.29,126$845K0.0%+9.5%0.012%
2/17/2026 Public Employees Retirement System of Ohio49,232$1.43M0.0%-4.1%0.020%
2/17/2026 California State Teachers Retirement System149,912$4.35M0.0%-7.6%0.061%
2/17/2026 Russell Investments Group Ltd.437,016$12.67M0.0%+50.9%0.179%
2/17/2026 Maryland State Retirement & Pension System29,913$867K0.0%+1.6%0.012%
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2/17/2026 Atom Investors LP43,737$1.27M0.1%-69.7%0.018%
2/17/2026 State of Wisconsin Investment Board103,682$3.01M0.0%+13.4%0.043%
2/17/2026 Captrust Financial Advisors31,935$926K0.0%+7.6%0.013%
2/17/2026 ExodusPoint Capital Management LP1,184,186$34.34M0.3%+1,015.2%0.485%
2/17/2026 Royal Bank of Canada266,543$7.73M0.0%+10.1%0.109%
2/17/2026 Blair William & Co. IL79,965$2.32M0.0%+57.9%0.033%
2/17/2026 Magnetar Financial LLC20,875$605K0.0%N/A0.009%
2/16/2026 Vanguard Personalized Indexing Management LLC17,751$515K0.0%+12.7%0.007%
2/16/2026 Verition Fund Management LLC865,172$25.09M0.1%-23.8%0.355%
2/16/2026 Mariner LLC48,837$1.42M0.0%+20.2%0.020%


AMTM Institutional Ownership - Frequently Asked Questions

During the previous two years, 483 institutional investors and hedge funds held shares of Amentum. The most heavily invested institutionals were American Securities LLC ($1.06B), Invesco Ltd. ($633.19M), Vanguard Group Inc. ($446.94M), Primecap Management Co. CA ($351.68M), Legacy Advisors LLC ($284.61M), State Street Corp ($146.79M), and Frontier Capital Management Co. LLC ($128.93M).Learn more on Amentum's institutional investors.

39.93% of Amentum's stock is owned by institutional investors. Learn more on AMTM's institutional investor holdings.

Of the 446 institutional investors that purchased Amentum's stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: American Securities LLC ($45.03M), Kovitz Investment Group Partners LLC ($14.79M), Invesco Ltd. ($14.32M), Primecap Management Co. CA ($12.24M), Legacy Advisors LLC ($9.81M), State Street Corp ($7.83M), and Norges Bank ($5.89M).

Institutional investors have bought a total of 53,387,619 shares in the last 24 months. This purchase volume represents approximately $1.40B in transactions.

Of the 136 institutional investors that sold Amentum's stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: Millennium Management LLC ($4.61M), Van ECK Associates Corp ($2.54M), State Street Corp ($1.77M), Voss Capital LP ($1.60M), Vanguard Group Inc. ($1.12M), Thompson Siegel & Walmsley LLC ($808.49K), and Ruane Cunniff & Goldfarb L.P. ($800.77K).

Institutional investors have sold a total of 21,186,551 shares in the last 24 months. This volume of shares sold represents approximately $539.07M in transactions.


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This page (NYSE:AMTM) was last updated on 6/21/2026 by MarketBeat.com Staff.
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