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Amentum (AMTM) Institutional Ownership

Amentum logo
$21.50 +0.89 (+4.32%)
As of 08/21/2026 03:58 PM Eastern
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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)
218
Total
Institutional Inflows
(last 12 months)
$1.84B
Number of
Institutional Sellers
(last 12 months)
128
Total
Institutional Outflows
(last 12 months)
$501.54M
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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
8/22/2026 TD Waterhouse Canada Inc.3,342$67K0.0%-24.9%0.001%
8/21/2026 AXQ Capital LP35,915$742K0.1%N/A0.015%
8/21/2026 Nykredit A S1,800$37K0.0%N/A0.001%
8/20/2026 Clifford Swan Investment Counsel LLC17,495$362K0.0%-8.9%0.007%
8/20/2026 Kerrisdale Advisers LLC59,845$1.24M0.3%+105.0%0.024%
8/20/2026 Ancora Advisors LLC715,652$14.79M0.3%+1.8%0.293%
8/20/2026 Susquehanna Fundamental Investments LLC394,370$8.15M0.2%+81.1%0.161%
8/20/2026 Moore Capital Management LP365,096$7.55M0.1%-58.2%0.149%
8/19/2026 UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC249,725$5.16M0.0%+0.7%0.102%
8/19/2026 Toth Financial Advisory Corp18,226$377K0.0%-18.5%0.007%
8/19/2026 Van ECK Associates Corp1,988,898$41.11M0.0%+263.2%0.813%
8/19/2026 Hsbc Holdings PLC22,218$460K0.0%N/A0.009%
8/18/2026 AWH Capital L.P.235,250$4.86B3.3%N/A0.096%
8/18/2026 Public Employees Retirement System of Ohio45,464$940K0.0%N/A0.019%
8/17/2026 Corient Private Wealth LP31,354$648K0.0%N/A0.013%
8/17/2026 Permian Investment Partners LP1,433,028$29.62B3.2%N/A0.586%
8/17/2026 Bank of America Corp DE2,042,897$42.23M0.0%N/A0.836%
8/15/2026 Strategic Global Advisors LLC99,103$2.05M0.3%N/A0.041%
8/15/2026 Jupiter Topco LLC69,400$1.43M0.0%N/A0.028%
8/14/2026 Hsbc Holdings PLC22,218$460K0.0%N/A0.009%
8/14/2026 Ancora Advisors LLC715,652$14.79M0.3%N/A0.293%
8/14/2026 Primecap Management Co. CA12,285,504$253.94M0.2%N/A5.025%
8/14/2026 Legal & General Group Plc349,048$7.22M0.0%N/A0.143%
8/14/2026 The Manufacturers Life Insurance Company 273,618$1.12M0.0%N/A0.112%
8/14/2026 Peak Asset Management LLC24,000$496K0.1%N/A0.010%
8/14/2026 Aberdeen Wealth Management LLC8,291$171K0.1%N/A0.003%
8/14/2026 Algert Global LLC102,220$2.11M0.0%+1.2%0.042%
8/13/2026 Sanctuary Advisors LLC15,732$325K0.0%N/A0.006%
8/13/2026 Clear Harbor Asset Management LLC31,780$657K0.0%N/A0.013%
8/12/2026 De Lisle Partners LLP374,818$7.74M0.8%N/A0.153%
8/11/2026 Allworth Financial LP9,805$203K0.0%N/A0.004%
8/10/2026 BOK Financial Private Wealth Inc.5,268$109K0.0%N/A0.002%
8/10/2026 Danske Bank A S8,536$176K0.0%N/A0.003%
8/8/2026 First National Bank of Omaha475,992$9.72M0.3%N/A0.195%
8/7/2026 BlackRock Inc.17,906,984$370.14M0.0%N/A7.329%
8/7/2026 Deutsche Bank AG21,821$451K0.0%N/A0.009%
8/7/2026 Old West Investment Management LLC32,875$680K0.1%N/A0.013%
8/6/2026 Global Retirement Partners LLC1,484$31K0.0%N/A0.001%
8/6/2026 Bank of New York Mellon Corp878,084$18.15M0.0%N/A0.359%
8/6/2026 State of Wyoming17,667$365K0.0%N/A0.007%
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8/3/2026 Oppenheimer Asset Management Inc.24,597$508K0.0%N/A0.010%
8/3/2026 Bryn Mawr Trust Advisors LLC141,443$2.92M0.1%N/A0.058%
7/10/2026 Wedge Capital Management L L P NC187,832$3.88M0.1%+14.1%0.077%
7/10/2026 Hudson Value Partners LLC250,185$5.17M1.3%+22.7%0.102%
7/9/2026 Steadtrust LLC30,400$628K0.3%-33.0%0.012%
7/7/2026 GAMMA Investing LLC4,958$102K0.0%-12.4%0.002%
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%
5/18/2026California 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 Company40,917$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%
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%
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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%


AMTM Institutional Ownership - Frequently Asked Questions

During the previous two years, 495 institutional investors and hedge funds held shares of Amentum. The most heavily invested institutionals were Permian Investment Partners LP ($29.62B), AWH Capital L.P. ($4.86B), American Securities LLC ($1.06B), Invesco Ltd. ($633.19M), Vanguard Group Inc. ($446.94M), BlackRock Inc. ($370.14M), and Legacy Advisors LLC ($284.61M).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 460 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), Primecap Management Co. CA ($24.52M), BlackRock Inc. ($17.91M), Kovitz Investment Group Partners LLC ($14.79M), Invesco Ltd. ($14.32M), Legacy Advisors LLC ($9.81M), and State Street Corp ($7.83M).

Institutional investors have bought a total of 76,825,986 shares in the last 24 months. This purchase volume represents approximately $1.84B in transactions.

Of the 128 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), Vanguard Group Inc. ($1.12M), Thompson Siegel & Walmsley LLC ($808.49K), Ruane Cunniff & Goldfarb L.P. ($800.77K), and Voss Capital LP ($775K).

Institutional investors have sold a total of 19,661,809 shares in the last 24 months. This volume of shares sold represents approximately $501.54M in transactions.


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Institutional ownership data for NYSE:AMTM is compiled from quarterly 13F filings submitted to the U.S. Securities and Exchange Commission (SEC), with the most recent received on 8/22/2026. New 13F filings are added each quarter as they're published.
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