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AMTM Insider Trading

Insider Ownership Percentage: 18.67%
Insider Buying (Last 12 Months): $2,178,658.00
Insider Selling (Last 12 Months): $0.00

Amentum Insider Trading History Chart

This chart shows the insider buying and selling history at Amentum by year and by quarter.

Skip ChartChart Data in Insider Trading History Table

Amentum Share Price & Price History

Current Price: $29.31
Price Change: ▲ Price Increase of +0.746 (2.61%)
As of 12/4/2025 04:59 PM ET

This chart shows the closing price history over time for AMTM up to the past year.

Skip Chart and Table DataPrice Data in Insider Trading History Table
Days: 30 | 90 | 365

Amentum Insider Trading History

Transaction DateInsider NameTitleBuy/SellNumber of SharesAverage Share PriceTotal TransactionShares Held After TransactionDetails
2/18/2025Barbara LoughranDirectorBuy4,600$21.23$97,658.004,600View SEC Filing Icon  
2/12/2025Steven J. DemetriouInsiderBuy100,000$20.81$2,081,000.00620,893View SEC Filing Icon  
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SEC Filings (Institutional Ownership Changes) for Amentum (NYSE:AMTM)

39.93% of Amentum stock is owned by institutions. Institutional ownership can be a sign of analyst confidence in the fundamentals of the stock.

Institutional Buying and Selling by Quarter

This chart shows the instiutional buying and selling at AMTM by year and by quarter.

Skip Institutional Buying and Selling Chart and Table DataRead Chart Data in Institutional Trading History Table

Amentum Institutional Trading History

Reporting DateHedge FundShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
11/26/2025Vermillion & White Wealth Management Group LLC1,905$46K0.0%N/A0.001%Search for SEC Filing on Google Icon
11/24/2025Penn Capital Management Company LLC960,607$23.06M1.8%-4.3%0.395%Search for SEC Filing on Google Icon
11/24/2025CIBC Private Wealth Group LLC5,300$0.13M0.0%+63.6%0.002%Search for SEC Filing on Google Icon
11/20/2025Voss Capital LP625,000$14.97M0.7%-55.4%0.257%Search for SEC Filing on Google Icon
11/18/2025Advisory Services Network LLC2,542$61K0.0%N/A0.001%Search for SEC Filing on Google Icon
11/17/2025Williams Jones Wealth Management LLC.36,709$0.88M0.0%-23.0%0.015%Search for SEC Filing on Google Icon
11/17/2025Dark Forest Capital Management LP95,866$2.30M0.1%N/A0.039%Search for SEC Filing on Google Icon
11/17/2025XTX Topco Ltd49,265$1.18M0.1%-23.9%0.020%Search for SEC Filing on Google Icon
11/17/2025Verition Fund Management LLC1,135,626$27.20M0.1%+1,128.0%0.467%Search for SEC Filing on Google Icon
11/17/2025Susquehanna Fundamental Investments LLC54,337$1.30M0.1%N/A0.022%Search for SEC Filing on Google Icon
11/17/2025Segra Capital Management LLC417,025$9.99M4.0%N/A0.171%Search for SEC Filing on Google Icon
11/17/2025Quantessence Capital LLC10,879$0.26M0.1%N/A0.004%Search for SEC Filing on Google Icon
11/17/2025Prelude Capital Management LLC10,449$0.25M0.0%N/A0.004%Search for SEC Filing on Google Icon
11/17/2025Mariner LLC40,642$0.97M0.0%-5.5%0.017%Search for SEC Filing on Google Icon
11/17/2025Millennium Management LLC640,799$15.35M0.0%-86.3%0.263%Search for SEC Filing on Google Icon
11/17/2025MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.2,081,611$49.86M0.1%+50.9%0.855%Search for SEC Filing on Google Icon
11/17/2025Moore Capital Management LP407,417$9.76M0.1%-33.3%0.167%Search for SEC Filing on Google Icon
11/17/2025Lido Advisors LLC9,789$0.23M0.0%-4.8%0.004%Search for SEC Filing on Google Icon
11/17/2025Holocene Advisors LP45,814$1.10M0.0%N/A0.019%Search for SEC Filing on Google Icon
11/17/2025Hyperion Capital Advisors LP420,008$10.06M5.4%+715.8%0.173%Search for SEC Filing on Google Icon
11/17/2025Gotham Asset Management LLC244,826$5.86M0.0%N/A0.101%Search for SEC Filing on Google Icon
11/17/2025Focus Partners Wealth32,616$0.78M0.0%-11.7%0.013%Search for SEC Filing on Google Icon
11/17/2025CSM Advisors LLC202,807$4.86M0.1%-68.0%0.083%Search for SEC Filing on Google Icon
11/17/2025California Public Employees Retirement System232,009$5.56M0.0%+1.3%0.095%Search for SEC Filing on Google Icon
11/17/2025Bank of America Corp DE798,437$19.12M0.0%-8.0%0.328%Search for SEC Filing on Google Icon
11/17/2025American Trust Investment Advisors LLC30,483$0.73M0.4%-8.3%0.013%Search for SEC Filing on Google Icon
11/17/2025Aristotle Capital Boston LLC409,143$9.80M0.5%-3.3%0.168%Search for SEC Filing on Google Icon
11/17/2025Algert Global LLC221,610$5.31M0.1%+828.0%0.091%Search for SEC Filing on Google Icon
11/17/2025Alliancebernstein L.P.169,726$4.07M0.0%-51.3%0.070%Search for SEC Filing on Google Icon
11/17/2025Ameriprise Financial Inc.355,946$8.53M0.0%+3.8%0.146%Search for SEC Filing on Google Icon
11/14/2025Creative Planning36,113$0.87M0.0%+5.3%0.015%Search for SEC Filing on Google Icon
11/14/2025Ancora Advisors LLC133,874$3.21M0.1%+1.3%0.055%Search for SEC Filing on Google Icon
11/14/2025Raymond James Financial Inc.139,403$3.34M0.0%-26.6%0.057%Search for SEC Filing on Google Icon
11/14/2025Hotchkis & Wiley Capital Management LLC268,130$6.42M0.0%N/A0.110%Search for SEC Filing on Google Icon
11/14/2025Zurcher Kantonalbank Zurich Cantonalbank 29,538$0.71M0.0%+10.1%0.012%Search for SEC Filing on Google Icon
11/14/2025UBS AM A Distinct Business Unit of UBS Asset Management Americas LLC277,897$6.66M0.0%-35.5%0.114%Search for SEC Filing on Google Icon
11/14/2025Two Sigma Investments LP399,123$9.56M0.0%+2,807.2%0.164%Search for SEC Filing on Google Icon
11/14/2025Soviero Asset Management LP155,000$3.71M1.9%+40.9%0.064%Search for SEC Filing on Google Icon
11/14/2025Vident Advisory LLC454,704$10.89M0.1%+5.2%0.187%Search for SEC Filing on Google Icon
11/14/2025Caption Management LLC41,100$0.98M0.0%-92.8%0.017%Search for SEC Filing on Google Icon
11/14/2025iSAM Funds UK Ltd10,848$0.26M0.1%N/A0.004%Search for SEC Filing on Google Icon
11/14/2025Comerica Bank312,639$7.49M0.0%-13.6%0.128%Search for SEC Filing on Google Icon
11/13/2025Entropy Technologies LP14,570$0.35M0.0%-44.3%0.006%Search for SEC Filing on Google Icon
11/13/2025Invesco Ltd.22,116,835$529.70M0.1%+13.0%9.089%Search for SEC Filing on Google Icon
11/13/2025Sei Investments Co.200,523$4.80M0.0%-8.5%0.082%Search for SEC Filing on Google Icon
11/13/2025UBS Group AG231,190$5.54M0.0%-69.8%0.095%Search for SEC Filing on Google Icon
11/13/2025Franklin Resources Inc.9,035$0.22M0.0%N/A0.004%Search for SEC Filing on Google Icon
11/13/2025Brightline Capital Management LLC1,200,000$28.74M11.8%+20.0%0.493%Search for SEC Filing on Google Icon
11/13/2025Van ECK Associates Corp765,677$18.34M0.0%-75.0%0.315%Search for SEC Filing on Google Icon
11/13/2025FourThought Financial Partners LLC9,379$0.23M0.0%N/A0.004%Search for SEC Filing on Google Icon
11/13/2025BW Gestao de Investimentos Ltda.511,477$12.25M0.5%-28.5%0.210%Search for SEC Filing on Google Icon
11/13/2025Legal & General Group Plc388,289$9.30M0.0%-4.0%0.160%Search for SEC Filing on Google Icon
11/13/2025Swiss National Bank306,491$7.34M0.0%+1.4%0.126%Search for SEC Filing on Google Icon
11/13/2025WINTON GROUP Ltd53,409$1.28M0.0%-52.5%0.022%Search for SEC Filing on Google Icon
11/13/2025Russell Investments Group Ltd.289,549$6.93M0.0%-11.8%0.119%Search for SEC Filing on Google Icon
11/13/2025Dynamic Technology Lab Private Ltd18,458$0.44M0.1%N/A0.008%Search for SEC Filing on Google Icon
11/13/2025Korea Investment CORP1,166$28K0.0%-70.7%0.000%Search for SEC Filing on Google Icon
11/13/2025Grantham Mayo Van Otterloo & Co. LLC10,457$0.25M0.0%N/A0.004%Search for SEC Filing on Google Icon
11/13/2025Blair William & Co. IL50,649$1.21M0.0%-10.5%0.021%Search for SEC Filing on Google Icon
11/13/2025First Trust Advisors LP38,590$0.92M0.0%N/A0.016%Search for SEC Filing on Google Icon
11/12/2025Gabelli Funds LLC22,288$0.53M0.0%-11.0%0.009%Search for SEC Filing on Google Icon
11/12/2025Gamco Investors INC. ET AL99,643$2.39M0.0%-8.3%0.041%Search for SEC Filing on Google Icon
11/12/2025Barclays PLC53,662$1.29M0.0%+9.0%0.022%Search for SEC Filing on Google Icon
11/12/2025Tower Bridge Advisors37,204$0.89M0.1%+3.2%0.015%Search for SEC Filing on Google Icon
11/12/2025Dimensional Fund Advisors LP1,306,051$31.27M0.0%-2.2%0.537%Search for SEC Filing on Google Icon
11/12/2025Arvin Capital Management LP1,636,492$39.19M7.1%-26.9%0.673%Search for SEC Filing on Google Icon
11/12/2025South Dakota Investment Council64,420$1.54M0.0%N/A0.026%Search for SEC Filing on Google Icon
11/12/2025Teachers Retirement System of The State of Kentucky42,388$1.02M0.0%-17.4%0.017%Search for SEC Filing on Google Icon
11/12/2025Victory Capital Management Inc.28,908$0.69M0.0%-14.2%0.012%Search for SEC Filing on Google Icon
11/12/2025CI Investments Inc.428,271$10.26M0.0%-5.8%0.176%Search for SEC Filing on Google Icon
11/12/2025Paragon Capital Management LLC48,070$1.15M0.6%-1.3%0.020%Search for SEC Filing on Google Icon
11/12/2025Lathrop Investment Management Co.22,817$0.55M0.1%-18.0%0.009%Search for SEC Filing on Google Icon
11/12/2025Royce & Associates LP454,500$10.89M0.1%+35.7%0.187%Search for SEC Filing on Google Icon
11/12/2025Aster Capital Management DIFC Ltd2,931$70K0.0%N/A0.001%Search for SEC Filing on Google Icon
11/12/2025Clifford Swan Investment Counsel LLC28,072$0.67M0.0%-1.8%0.012%Search for SEC Filing on Google Icon
11/12/2025Primecap Management Co. CA11,918,586$285.45M0.2%-0.9%4.898%Search for SEC Filing on Google Icon
11/10/2025Optiver Holding B.V.7,954$0.19M0.0%N/A0.003%Search for SEC Filing on Google Icon
11/10/2025Counterpoint Mutual Funds LLC21,913$0.53M0.0%N/A0.009%Search for SEC Filing on Google Icon
11/10/2025Washington Trust Advisors Inc.8,263$0.20M0.0%-20.4%0.003%Search for SEC Filing on Google Icon
11/10/2025Granite Investment Partners LLC14,758$0.35M0.0%-26.1%0.006%Search for SEC Filing on Google Icon
11/10/2025Kovitz Investment Group Partners LLC3,007,750$72.04M0.3%+0.2%1.236%Search for SEC Filing on Google Icon
11/10/2025Dover Advisors LLC17,285$0.41M0.2%N/A0.007%Search for SEC Filing on Google Icon
11/10/2025Advyzon Investment Management LLC10,481$0.25M0.0%N/A0.004%Search for SEC Filing on Google Icon
11/10/2025Citigroup Inc.76,709$1.84M0.0%-40.9%0.032%Search for SEC Filing on Google Icon
11/7/2025CenterBook Partners LP308,081$7.38M0.4%+145.8%0.127%Search for SEC Filing on Google Icon
11/7/2025BOK Financial Private Wealth Inc.7,088$0.17M0.0%-24.3%0.003%Search for SEC Filing on Google Icon
11/7/2025Crestwood Advisors Group LLC77,532$1.86M0.0%-5.2%0.032%Search for SEC Filing on Google Icon
11/7/2025GSA Capital Partners LLP23,285$0.56M0.0%N/A0.010%Search for SEC Filing on Google Icon
11/7/2025Vanguard Group Inc.15,554,691$372.54M0.0%-5.9%6.392%Search for SEC Filing on Google Icon
11/7/2025JPMorgan Chase & Co.104,771$2.51M0.0%+14.7%0.043%Search for SEC Filing on Google Icon
11/7/2025State of New Jersey Common Pension Fund D87,642$2.10M0.0%-12.4%0.036%Search for SEC Filing on Google Icon
11/6/2025Mraz Amerine & Associates Inc.29,195$0.70M0.1%+241.5%0.012%Search for SEC Filing on Google Icon
11/6/2025Public Sector Pension Investment Board597,976$14.32M0.1%+16.3%0.246%Search for SEC Filing on Google Icon
11/6/2025Illinois Municipal Retirement Fund82,628$1.98M0.0%+9.5%0.034%Search for SEC Filing on Google Icon
11/6/2025Rhumbline Advisers289,818$6.94M0.0%+0.9%0.119%Search for SEC Filing on Google Icon
11/6/2025Advisors Asset Management Inc.31,064$0.74M0.0%-31.2%0.013%Search for SEC Filing on Google Icon
11/6/2025Versor Investments LP42,911$1.03M0.2%-30.8%0.018%Search for SEC Filing on Google Icon
11/6/2025Oppenheimer & Co. Inc.75,483$1.81M0.0%+723.8%0.031%Search for SEC Filing on Google Icon
11/6/2025Oppenheimer Asset Management Inc.12,116$0.29M0.0%-5.2%0.005%Search for SEC Filing on Google Icon
11/5/2025Carlson Capital L.P.24,000$0.58M0.2%N/A0.010%Search for SEC Filing on Google Icon
Data available starting January 2016

See Full Table
Amentum logo
Amentum Holdings, Inc. provides engineering and technology solutions to address challenges in science, security, and sustainability. It serves various markets, such as energy and environment, space, intelligence, defense, civilian, commercial, and international markets. The company was incorporated in 2010 and is headquatered in Chantilly, Virginia.
Read More on Amentum

Today's Range

Now: $29.31
Low: $28.45
High: $29.68

50 Day Range

MA: $24.14
Low: $21.49
High: $30.00

52 Week Range

Now: $29.31
Low: $16.01
High: $31.87

Volume

3,924,354 shs

Average Volume

2,802,131 shs

Market Capitalization

$7.14 billion

P/E Ratio

108.54

Dividend Yield

N/A

Beta

N/A

Who are the company insiders with the largest holdings of Amentum?

Amentum's top insider investors include:
  1. Steven J Demetriou (Insider)
  2. Barbara Loughran (Director)
Learn More about top insider investors at Amentum.

Who are the major institutional investors of Amentum?

Amentum's top institutional shareholders include:
  1. Invesco Ltd. — 9.09%
  2. Vanguard Group Inc. — 6.39%
  3. Primecap Management Co. CA — 4.90%
  4. Kovitz Investment Group Partners LLC — 1.24%
  5. MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. — 0.86%
  6. Thrivent Financial for Lutherans — 0.74%
Learn More about top institutional investors of Amentum stock.

Which major investors are selling Amentum stock?

In the previous quarter, AMTM stock was sold by these institutional investors:
  1. Millennium Management LLC
  2. Van ECK Associates Corp
  3. Vanguard Group Inc.
  4. Voss Capital LP
  5. Arvin Capital Management LP
  6. UBS Group AG
  7. Caption Management LLC
  8. CSM Advisors LLC

Which major investors are buying Amentum stock?

In the previous quarter, AMTM stock was bought by institutional investors including:
  1. Invesco Ltd.
  2. Verition Fund Management LLC
  3. MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.
  4. Voya Investment Management LLC
  5. Segra Capital Management LLC
  6. Two Sigma Investments LP
  7. Hyperion Capital Advisors LP
  8. Hotchkis & Wiley Capital Management LLC
In the previous year, these company insiders have bought Amentum stock:
  1. Steven J Demetriou (Insider)
  2. Barbara Loughran (Director)
Learn More investors buying Amentum stock.