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Amentum (AMTM) Institutional Ownership

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$23.87 +0.48 (+2.05%)
As of 02:01 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)
355
Total
Institutional Inflows
(last 12 months)
$2.51B
Number of
Institutional Sellers
(last 12 months)
127
Total
Institutional Outflows
(last 12 months)
$422.67M
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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
10/9/2025 Toth Financial Advisory Corp13,716$328K0.0%+32.4%0.006%
10/9/2025 Voya Investment Management LLC1,084,969$25.99M0.0%+66.5%0.446%
10/6/2025 Heartwood Wealth Advisors LLC1,892$45K0.0%N/A0.001%
10/2/2025 GAMMA Investing LLC5,021$120K0.0%+13.0%0.002%
10/1/2025 Cacti Asset Management LLC857,092$19.35M1.3%+1.0%0.352%
10/1/2025 Neville Rodie & Shaw Inc.26,442$633K0.0%-10.2%0.011%
9/26/2025Corient Private Wealth LLC48,384$1.14M0.0%+11.9%0.020%
9/22/2025Caldwell Trust Co1,954$46K0.0%N/A0.001%
9/4/2025Osaic Holdings Inc.21,993$519K0.0%+6.8%0.009%
8/26/2025Thrivent Financial for Lutherans1,687,105$39.83M0.1%+4.1%0.693%
8/19/2025Marex Group plc50,000$1.18M0.0%N/A0.021%
8/19/2025State of Wyoming2,758$65K0.0%N/A0.001%
8/16/2025Public Sector Pension Investment Board514,172$12.14M0.1%+13.0%0.211%
8/16/2025Evergreen Capital Management LLC11,196$264K0.0%N/A0.005%
8/15/2025Tower Research Capital LLC TRC 4,353$103K0.0%+182.1%0.002%
8/15/2025Security National Bank of Sioux City Iowa IA19,273$455K0.3%+12.9%0.008%
8/15/2025Security National Bank of SO Dak26,840$634K0.3%+8.1%0.011%
8/15/2025Corient Private Wealth LLC48,395$1.14M0.0%+11.9%0.020%
8/15/2025State of Tennessee Department of Treasury62,654$1.48M0.0%-17.1%0.026%
8/15/2025Captrust Financial Advisors30,815$728K0.0%+49.5%0.013%
8/15/2025Vident Advisory LLC432,165$10.20M0.1%+47.6%0.178%
8/15/2025Tidal Investments LLC9,430$223K0.0%N/A0.004%
8/15/2025Smartleaf Asset Management LLC1,814$43K0.0%+433.5%0.001%
8/15/2025Riggs Asset Managment Co. Inc.1,931$46K0.0%N/A0.001%
8/15/2025Ruane Cunniff & Goldfarb L.P.2,441,743$57.65M1.0%+2.0%1.003%
8/15/2025Moore Capital Management LP611,123$14.43M0.2%+22.7%0.251%
8/15/2025Hyperion Capital Advisors LP51,487$1.22M0.8%+177.0%0.021%
8/15/2025Fortress Investment Group LLC38,106$900K0.1%+506.1%0.016%
8/15/2025Grizzlyrock Capital LLC253,363$5.98M4.1%+54.3%0.104%
8/15/2025Bank of America Corp DE868,265$20.50M0.0%-10.4%0.357%
8/15/2025683 Capital Management LLC1,630,000$38.48M2.5%+46.5%0.670%
8/15/2025Ameriprise Financial Inc.342,862$8.10M0.0%+3.4%0.141%
8/15/2025AQR Capital Management LLC350,203$8.27M0.0%N/A0.144%
8/15/2025Avenir Corp895,352$21.14M2.2%-1.0%0.368%
8/15/2025AWH Capital L.P.165,250$3.90M4.6%+288.8%0.068%
8/15/2025Aberdeen Wealth Management LLC9,491$224K0.1%N/A0.004%
8/14/2025Sandia Investment Management LP22,505$531K1.4%+13.6%0.009%
8/14/2025BW Gestao de Investimentos Ltda.715,065$16.88M0.7%+81.3%0.294%
8/14/2025California State Teachers Retirement System162,297$3.83M0.0%+23.7%0.067%
8/14/2025Raymond James Financial Inc.189,810$4.48M0.0%+5.1%0.078%
8/14/2025Worldquant Millennium Advisors LLC13,358$315K0.0%N/A0.005%
8/14/2025Canada Pension Plan Investment Board8,094$191K0.0%N/A0.003%
8/14/2025Quantinno Capital Management LP51,543$1.22M0.0%+25.1%0.021%
8/14/2025MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.1,379,752$32.58M0.1%N/A0.567%
8/14/2025Treasurer of the State of North Carolina74,368$1.76M0.0%+9.7%0.031%
8/14/2025The Manufacturers Life Insurance Company 36,363$859K0.0%-3.1%0.015%
8/14/2025Sei Investments Co.219,126$5.17M0.0%-23.9%0.090%
8/14/2025Kopernik Global Investors LLC636,226$15.02M1.6%-41.0%0.261%
8/14/2025Frontier Capital Management Co. LLC5,460,743$128.93M1.2%+52.6%2.244%
8/14/2025Soviero Asset Management LP110,000$2.60M1.6%N/A0.045%
8/14/2025Intact Investment Management Inc.7,319$173K0.0%+6.1%0.003%
8/14/2025State Street Corp7,078,249$167.12M0.0%+7.6%2.909%
8/14/2025Voss Capital LP1,400,000$33.05M2.3%-37.0%0.575%
8/14/2025WINTON GROUP Ltd112,421$2.65M0.1%-3.7%0.046%
8/14/2025North Growth Management Ltd.97,000$2.30M0.4%+5.4%0.040%
8/14/2025California Public Employees Retirement System228,921$5.41M0.0%+21.9%0.094%
8/14/2025Cerity Partners LLC45,116$1.07M0.0%+16.3%0.019%
8/13/2025Gabelli Funds LLC25,053$592K0.0%N/A0.010%
8/13/2025Gamco Investors INC. ET AL108,670$2.57M0.0%N/A0.045%
8/13/2025Diametric Capital LP10,343$244K0.1%N/A0.004%
8/13/2025Brown Advisory Inc.10,608$250K0.0%-9.1%0.004%
8/13/2025Marshall Wace LLP74,831$1.77M0.0%-49.2%0.031%
8/13/2025EverSource Wealth Advisors LLC1,520$36K0.0%-58.5%0.001%
8/13/2025Invesco Ltd.19,577,241$462.22M0.1%+13.9%8.046%
8/13/2025M&T Bank Corp10,219$241K0.0%N/A0.004%
8/13/2025New York State Common Retirement Fund693,777$16.38M0.0%+13.4%0.285%
8/13/2025Loomis Sayles & Co. L P1,059,209$25.01M0.0%+143.1%0.435%
8/13/2025Norges Bank2,160,728$51.02M0.0%N/A0.888%
8/13/2025State Board of Administration of Florida Retirement System122,366$2.89M0.0%+6.7%0.050%
8/13/2025Korea Investment CORP3,986$94K0.0%N/A0.002%
8/13/2025Quadrant Capital Group LLC13,058$308K0.0%+11.9%0.005%
8/13/2025Russell Investments Group Ltd.328,182$7.75M0.0%+40.9%0.135%
8/12/2025Advisors Asset Management Inc.45,183$1.07M0.0%-20.2%0.019%
8/12/2025XTX Topco Ltd64,723$1.53M0.1%N/A0.027%
8/12/2025Steward Partners Investment Advisory LLC1,210$29K0.0%-49.5%0.000%
8/12/2025Prudential Financial Inc.150,008$3.77M0.0%+8.9%0.062%
8/12/2025Rock Creek Group LP15,000$354K0.0%-40.0%0.006%
8/12/2025Rhumbline Advisers287,247$6.78M0.0%-7.4%0.118%
8/12/2025CenterBook Partners LP125,340$2.96M0.2%-69.8%0.052%
8/12/2025Sfmg LLC11,652$275K0.0%+6.1%0.005%
8/12/2025AXQ Capital LP15,609$369K0.1%N/A0.006%
8/12/2025Legal & General Group Plc404,673$9.55M0.0%+3.5%0.166%
8/12/2025MAI Capital Management4,259$101K0.0%+12.3%0.002%
8/12/2025JPMorgan Chase & Co.91,322$2.16M0.0%+4.1%0.038%
8/12/2025Entropy Technologies LP26,167$618K0.0%N/A0.011%
8/12/2025Swiss National Bank302,191$7.14M0.0%+16.6%0.124%
8/12/2025Hikari Tsushin Inc.45,403$1.07M0.1%+6.1%0.019%
8/12/2025Ensign Peak Advisors Inc40,586$958K0.0%+6.1%0.017%
8/11/2025Primecap Management Co. CA12,030,656$284.04M0.2%+19.6%4.944%
8/11/2025Universal Beteiligungs und Servicegesellschaft mbH83,769$1.98M0.0%+290.3%0.034%
8/8/2025Cetera Investment Advisers14,179$335K0.0%N/A0.006%
8/8/2025Paragon Capital Management LLC48,710$1.15M0.6%+1.3%0.020%
8/8/2025Creative Planning34,301$810K0.0%+78.8%0.014%
8/8/2025Commonwealth of Pennsylvania Public School Empls Retrmt SYS38,732$914K0.0%+12.8%0.016%
8/8/2025Police & Firemen s Retirement System of New Jersey60,391$1.43M0.0%+161.2%0.025%
8/8/2025Geode Capital Management LLC2,513,161$59.35M0.0%+9.3%1.033%
8/8/2025Everett Harris & Co. CA10,085$238K0.0%-67.9%0.004%
8/8/2025PNC Financial Services Group Inc.13,924$329K0.0%-10.5%0.006%
8/8/2025KBC Group NV6,126$145K0.0%-16.5%0.003%
8/7/2025Allworth Financial LP10,256$242K0.0%+24.1%0.004%
(Data available from 1/1/2016 forward)

AMTM Institutional Ownership - Frequently Asked Questions

Who are the largest shareholders of AMTM shares?

During the previous two years, 391 institutional investors and hedge funds held shares of Amentum. The most heavily invested institutionals were American Securities LLC ($1.06B), Invesco Ltd. ($462.22M), Vanguard Group Inc. ($297.44M), Primecap Management Co. CA ($284.04M), State Street Corp ($167.12M), Frontier Capital Management Co. LLC ($128.93M), and Cooper Creek Partners Management LLC ($87.42M).Learn more on Amentum's institutional investors.

What percentage of Amentum's stock is owned by institutional investors?

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

Which institutional investors have been buying Amentum's stock?

Of the 355 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), Primecap Management Co. CA ($12.03M), Invesco Ltd. ($11.78M), State Street Corp ($7.83M), Wellington Management Group LLP ($3.73M), and Norges Bank ($3.60M).

How much institutional buying is happening at Amentum?

Institutional investors have bought a total of 159,339,813 shares in the last 24 months. This purchase volume represents approximately $2.51B in transactions.

Which of Amentum's major shareholders have been selling company stock?

Of the 127 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: Kovitz Investment Group Partners LLC ($11.71M), Geode Capital Management LLC ($1.18M), Deutsche Bank AG ($919.31K), Voss Capital LP ($820.71K), Kopernik Global Investors LLC ($441.27K), Renaissance Technologies LLC ($429.50K), and UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC ($400.43K).

How much institutional selling is happening at Amentum?

Institutional investors have sold a total of 21,572,427 shares in the last 24 months. This volume of shares sold represents approximately $422.67M in transactions.


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This page (NYSE:AMTM) was last updated on 10/13/2025 by MarketBeat.com Staff
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