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Amentum (AMTM) Institutional Ownership

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$18.14 -0.34 (-1.85%)
Closing price 03:59 PM Eastern
Extended Trading
$18.08 -0.06 (-0.33%)
As of 05:56 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)
219
Total
Institutional Inflows
(last 12 months)
$1.89B
Number of
Institutional Sellers
(last 12 months)
131
Total
Institutional Outflows
(last 12 months)
$501.82M
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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
10/1/2026Cacti Asset Management LLC875,097$15.88M0.9%-0.7%0.358%
9/18/2026Security National Bank of Sioux City Iowa IA23,326$482K0.2%+31.3%0.010%
9/9/2026WINTON GROUP Ltd58,393$1.21M0.0%+5.2%0.024%
9/9/2026Integrated Wealth Concepts LLC2,405$50K0.0%N/A0.001%
9/8/2026Mraz Amerine & Associates Inc.90,200$1.86M0.3%+25.3%0.037%
9/8/2026Nykredit A S1,800$37K0.0%N/A0.001%
8/27/2026Corient Private Wealth LP27,543$569K0.0%-6.7%0.011%
8/26/2026HighTower Advisors LLC14,108$292K0.0%-24.2%0.006%
8/25/2026VIRGINIA RETIREMENT SYSTEMS ET Al19,400$401K0.0%N/A0.008%
8/23/2026Washington Trust Advisors Inc.3,598$74K0.0%-55.7%0.001%
8/23/2026Ameritas Advisory Services LLC26,747$553K0.0%N/A0.011%
8/23/2026Troluce Capital Advisors LLC3,565,399$73.70M7.6%+256.5%1.458%
8/22/2026TD Waterhouse Canada Inc.3,342$67K0.0%-24.9%0.001%
8/21/2026AXQ Capital LP35,915$742K0.1%N/A0.015%
8/21/2026Nykredit A S1,800$37K0.0%N/A0.001%
8/20/2026Clifford Swan Investment Counsel LLC17,495$362K0.0%-8.9%0.007%
8/20/2026Kerrisdale Advisers LLC59,845$1.24M0.3%+105.0%0.024%
8/20/2026Ancora Advisors LLC715,652$14.79M0.3%+1.8%0.293%
8/20/2026Susquehanna Fundamental Investments LLC394,370$8.15M0.2%+81.1%0.161%
8/20/2026Moore Capital Management LP365,096$7.55M0.1%-58.2%0.149%
8/19/2026UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC249,725$5.16M0.0%+0.7%0.102%
8/19/2026Toth Financial Advisory Corp18,226$377K0.0%-18.5%0.007%
8/19/2026Van ECK Associates Corp1,988,898$41.11M0.0%+263.2%0.813%
8/19/2026Hsbc Holdings PLC22,218$460K0.0%N/A0.009%
8/18/2026AWH Capital L.P.235,250$4.86M0.0%N/A0.096%
8/18/2026Public Employees Retirement System of Ohio45,464$940K0.0%N/A0.019%
8/17/2026Corient Private Wealth LP31,354$648K0.0%N/A0.013%
8/17/2026Permian Investment Partners LP1,433,028$29.62M0.0%N/A0.586%
8/17/2026Bank of America Corp DE2,042,897$42.23M0.0%N/A0.836%
8/15/2026Strategic Global Advisors LLC99,103$2.05M0.3%N/A0.041%
8/15/2026Jupiter Topco LLC69,400$1.43M0.0%N/A0.028%
8/14/2026Hsbc Holdings PLC22,218$460K0.0%N/A0.009%
8/14/2026Ancora Advisors LLC715,652$14.79M0.3%N/A0.293%
8/14/2026Primecap Management Co. CA12,285,504$253.94M0.2%N/A5.025%
8/14/2026Legal & General Group Plc349,048$7.22M0.0%N/A0.143%
8/14/2026The Manufacturers Life Insurance Company273,618$1.12M0.0%N/A0.112%
8/14/2026Peak Asset Management LLC24,000$496K0.1%N/A0.010%
8/14/2026Aberdeen Wealth Management LLC8,291$171K0.1%N/A0.003%
8/14/2026Algert Global LLC102,220$2.11M0.0%+1.2%0.042%
8/13/2026Sanctuary Advisors LLC15,732$325K0.0%N/A0.006%
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8/13/2026Clear Harbor Asset Management LLC31,780$657K0.0%N/A0.013%
8/12/2026De Lisle Partners LLP374,818$7.74M0.8%N/A0.153%
8/11/2026Allworth Financial LP9,805$203K0.0%N/A0.004%
8/10/2026BOK Financial Private Wealth Inc.5,268$109K0.0%N/A0.002%
8/10/2026Danske Bank A S8,536$176K0.0%N/A0.003%
8/8/2026First National Bank of Omaha475,992$9.72M0.3%N/A0.195%
8/7/2026BlackRock Inc.17,906,984$370.14M0.0%N/A7.329%
8/7/2026Deutsche Bank AG21,821$451K0.0%N/A0.009%
8/7/2026Old West Investment Management LLC32,875$680K0.1%N/A0.013%
8/6/2026Global Retirement Partners LLC1,484$31K0.0%N/A0.001%
8/6/2026Bank of New York Mellon Corp878,084$18.15M0.0%N/A0.359%
8/6/2026State of Wyoming17,667$365K0.0%N/A0.007%
8/3/2026Oppenheimer Asset Management Inc.24,597$508K0.0%N/A0.010%
8/3/2026Bryn Mawr Trust Advisors LLC141,443$2.92M0.1%N/A0.058%
7/10/2026Wedge Capital Management L L P NC187,832$3.88M0.1%+14.1%0.077%
7/10/2026Hudson Value Partners LLC250,185$5.17M1.3%+22.7%0.102%
7/9/2026Steadtrust LLC30,400$628K0.3%-33.0%0.012%
7/7/2026GAMMA Investing LLC4,958$102K0.0%-12.4%0.002%
6/16/2026Empowered Funds LLC7,900$206K0.0%N/A0.003%
6/8/2026Pine Valley Investments Ltd Liability Co79,275$2.07M0.1%+4.5%0.032%
5/27/2026Alpine Woods Capital Investors LLC8,402$219K0.1%N/A0.003%
5/19/2026Western Wealth Management LLC1,252$33K0.0%N/A0.001%
5/19/2026Rovida Investment Management Ltd315,000$8.21M1.0%N/A0.129%
5/19/2026Bank 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%
5/18/2026Royal Bank of Canada231,742$6.04M0.0%-13.1%0.095%
5/18/2026Ruane Cunniff & Goldfarb L.P.1,622,982$42.33M0.7%-32.2%0.664%
5/18/2026Empowered Funds LLC7,900$206K0.0%N/A0.003%
5/16/2026The Manufacturers Life Insurance Company40,917$1.07M0.0%+10.8%0.017%
5/16/2026Maverick Capital Ltd.46,335$1.21M0.0%N/A0.019%
5/16/2026Quantinno Capital Management LP145,574$3.80M0.0%+86.7%0.060%
5/15/2026Troluce Capital Advisors LLC1,000,000$26.08M1.6%N/A0.409%
5/15/2026Entropy Technologies LP26,895$701K0.0%N/A0.011%
5/14/2026Gabelli Funds LLC69,783$1.82M0.0%+226.3%0.029%
5/14/2026Gamco Investors INC. ET AL95,331$2.49M0.0%+3.8%0.039%
5/14/2026Public Employees Retirement System of Ohio47,842$1.25M0.0%-2.8%0.020%
5/14/2026Sei Investments Co.294,668$7.69M0.0%+35.8%0.121%
5/14/2026State of Wyoming8,302$217K0.0%-30.3%0.003%
5/13/2026Cetera Investment Advisers24,375$636K0.0%+14.6%0.010%
5/13/2026CI Investments Inc.420,068$10.96M0.1%-1.3%0.172%
5/13/2026First Trust Advisors LP228,083$5.95M0.0%-39.6%0.094%
5/8/2026PNC Financial Services Group Inc.13,674$357K0.0%+8.3%0.006%
5/7/2026Dimensional Fund Advisors LP3,787,420$98.77M0.0%+106.6%1.553%
5/7/2026Hahn Capital Management LLC51,120$1.33M0.8%-17.5%0.021%
5/7/2026KBC Group NV5,431$142K0.0%-7.1%0.002%
5/7/2026Swiss National Bank313,391$8.17M0.0%+0.5%0.128%
5/6/2026California Public Employees Retirement System277,052$7.23M0.0%-0.6%0.114%
5/6/2026Gryphon Financial Partners LLC18,883$492K0.1%+16.0%0.008%
5/6/2026Modera Wealth Management LLC18,402$480K0.0%-16.1%0.008%
5/6/2026Bessemer Group Inc.125,952$3.28M0.0%+7,142.8%0.052%
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5/5/2026Bank of New York Mellon Corp908,599$23.70M0.0%-1.5%0.372%
5/5/2026Illinois Municipal Retirement Fund83,407$2.18M0.0%N/A0.034%
5/5/2026NFSG Corp1,350$35K0.0%N/A0.001%
5/4/2026Bryn Mawr Trust Advisors LLC116,871$3.05M0.1%+14.6%0.048%
5/4/2026Principal Financial Group Inc.744,728$19.42M0.0%+2.2%0.305%
5/1/2026Fifth Third Bancorp273,316$7.13M0.0%+10,456.8%0.112%
4/28/2026Intrinsic Value Partners LLC13,899$362K0.3%-16.7%0.006%
4/28/2026Stephens Inc. AR23,395$610K0.0%+3.7%0.010%
4/27/2026Moran Wealth Management LLC19,585$511K0.0%N/A0.008%
4/27/2026PFG Investments LLC10,332$269K0.0%+9.6%0.004%


AMTM Institutional Ownership - Frequently Asked Questions

During the previous two years, 497 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), BlackRock Inc. ($370.14M), Legacy Advisors LLC ($284.61M), Primecap Management Co. CA ($253.94M), and State Street Corp ($146.79M).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 462 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 79,385,407 shares in the last 24 months. This purchase volume represents approximately $1.89B in transactions.

Of the 131 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 19,676,431 shares in the last 24 months. This volume of shares sold represents approximately $501.82M 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 10/1/2026. New 13F filings are added each quarter as they're published.
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