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AMTM Insider Trading

Insider Ownership Percentage: 19.38%
Insider Buying (Last 12 Months): $0.00
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: $27.94
Price Change: ▼ Price Decrease of -0.061 (-0.22%)
As of 03/13/2026 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
3/9/2026Corient Private Wealth LLC36,949$1.07M0.0%-5.4%0.015%Search for SEC Filing on Google Icon
2/26/2026Alpine Global Management LLC25,000$0.73M0.1%-66.7%0.010%Search for SEC Filing on Google Icon
2/25/2026Hahn Capital Management LLC61,962$1.80M1.0%-5.8%0.025%Search for SEC Filing on Google Icon
2/19/2026Invesco Ltd.21,834,003$633.19M0.1%-1.3%8.951%Search for SEC Filing on Google Icon
2/19/2026Corient Private Wealth LLC36,872$1.07M0.0%-5.6%0.015%Search for SEC Filing on Google Icon
2/18/2026Mercer Global Advisors Inc. ADV15,502$0.45M0.0%N/A0.006%Search for SEC Filing on Google Icon
2/18/2026Vident Advisory LLC382,540$11.09M0.1%-15.9%0.157%Search for SEC Filing on Google Icon
2/18/2026State of Tennessee Department of Treasury46,262$1.34M0.0%-28.7%0.019%Search for SEC Filing on Google Icon
2/18/2026Mackenzie Financial Corp15,479$0.45M0.0%N/A0.006%Search for SEC Filing on Google Icon
2/18/2026XTX Topco Ltd44,821$1.30M0.0%-9.0%0.018%Search for SEC Filing on Google Icon
2/18/2026Utah Retirement Systems8,339$0.24M0.0%N/A0.003%Search for SEC Filing on Google Icon
2/18/2026Wellington Management Group LLP18,948$0.55M0.0%-3.8%0.008%Search for SEC Filing on Google Icon
2/18/2026Symmetry Investments LP10,000$0.29M0.0%N/A0.004%Search for SEC Filing on Google Icon
2/18/2026Twinbeech Capital LP137,453$3.99M0.3%-38.3%0.056%Search for SEC Filing on Google Icon
2/18/2026Susquehanna Fundamental Investments LLC219,931$6.38M0.2%+304.8%0.090%Search for SEC Filing on Google Icon
2/18/2026Oxford Asset Management LLP18,629$0.54M0.2%N/A0.008%Search for SEC Filing on Google Icon
2/18/2026Old West Investment Management LLC19,355$0.56M0.1%N/A0.008%Search for SEC Filing on Google Icon
2/18/2026Millennium Management LLC61,187$1.77M0.0%-90.5%0.025%Search for SEC Filing on Google Icon
2/18/2026Moore Capital Management LP475,314$13.78M0.2%+16.7%0.195%Search for SEC Filing on Google Icon
2/18/2026Gotham Asset Management LLC635,430$18.43M0.1%+159.5%0.260%Search for SEC Filing on Google Icon
2/18/2026Aristotle Capital Boston LLC358,867$10.41M0.6%-12.3%0.147%Search for SEC Filing on Google Icon
2/18/2026Balyasny Asset Management L.P.267,999$7.77M0.0%+644.2%0.110%Search for SEC Filing on Google Icon
2/18/2026Boothbay Fund Management LLC7,214$0.21M0.0%N/A0.003%Search for SEC Filing on Google Icon
2/18/2026American Trust Investment Advisors LLC29,175$0.85M0.5%-4.3%0.012%Search for SEC Filing on Google Icon
2/18/2026683 Capital Management LLC835,000$24.22M1.1%-34.5%0.342%Search for SEC Filing on Google Icon
2/17/2026Guggenheim Capital LLC9,439$0.27M0.0%N/A0.004%Search for SEC Filing on Google Icon
2/17/2026AQR Capital Management LLC1,452,049$42.11M0.0%+778.9%0.595%Search for SEC Filing on Google Icon
2/17/2026Cetera Investment Advisers21,274$0.62M0.0%-8.3%0.009%Search for SEC Filing on Google Icon
2/17/2026FIL Ltd1,429,384$41.45M0.0%-8.3%0.586%Search for SEC Filing on Google Icon
2/17/2026Price T Rowe Associates Inc. MD129,482$3.76M0.0%+9.6%0.053%Search for SEC Filing on Google Icon
2/17/2026Soviero Asset Management LP178,000$5.16M2.5%+14.8%0.073%Search for SEC Filing on Google Icon
2/17/2026Osaic Holdings Inc.29,126$0.85M0.0%+9.5%0.012%Search for SEC Filing on Google Icon
2/17/2026Public Employees Retirement System of Ohio49,232$1.43M0.0%-4.1%0.020%Search for SEC Filing on Google Icon
2/17/2026California State Teachers Retirement System149,912$4.35M0.0%-7.6%0.061%Search for SEC Filing on Google Icon
2/17/2026Russell Investments Group Ltd.437,016$12.67M0.0%+50.9%0.179%Search for SEC Filing on Google Icon
2/17/2026Maryland State Retirement & Pension System29,913$0.87M0.0%+1.6%0.012%Search for SEC Filing on Google Icon
2/17/2026Atom Investors LP43,737$1.27M0.1%-69.7%0.018%Search for SEC Filing on Google Icon
2/17/2026State of Wisconsin Investment Board103,682$3.01M0.0%+13.4%0.043%Search for SEC Filing on Google Icon
2/17/2026Captrust Financial Advisors31,935$0.93M0.0%+7.6%0.013%Search for SEC Filing on Google Icon
2/17/2026ExodusPoint Capital Management LP1,184,186$34.34M0.3%+1,015.2%0.485%Search for SEC Filing on Google Icon
2/17/2026Royal Bank of Canada266,543$7.73M0.0%+10.1%0.109%Search for SEC Filing on Google Icon
2/17/2026Blair William & Co. IL79,965$2.32M0.0%+57.9%0.033%Search for SEC Filing on Google Icon
2/17/2026Magnetar Financial LLC20,875$0.61M0.0%N/A0.009%Search for SEC Filing on Google Icon
2/16/2026Vanguard Personalized Indexing Management LLC17,751$0.52M0.0%+12.7%0.007%Search for SEC Filing on Google Icon
2/16/2026Verition Fund Management LLC865,172$25.09M0.1%-23.8%0.355%Search for SEC Filing on Google Icon
2/16/2026Mariner LLC48,837$1.42M0.0%+20.2%0.020%Search for SEC Filing on Google Icon
2/16/2026Focus Partners Wealth2,794,417$81.04M0.1%+8,467.6%1.146%Search for SEC Filing on Google Icon
2/16/2026Landscape Capital Management L.L.C.32,981$0.96M0.1%N/A0.014%Search for SEC Filing on Google Icon
2/16/2026Arax Advisory Partners4,361$0.13M0.0%-43.8%0.002%Search for SEC Filing on Google Icon
2/16/2026Barclays PLC50,375$1.46M0.0%-6.1%0.021%Search for SEC Filing on Google Icon
2/16/2026Atlas Capital Advisors Inc.1,662$48K0.0%N/A0.001%Search for SEC Filing on Google Icon
2/13/2026Kestra Advisory Services LLC3,690$0.11M0.0%N/A0.002%Search for SEC Filing on Google Icon
2/13/2026Marshall Wace LLP35,084$1.02M0.0%N/A0.014%Search for SEC Filing on Google Icon
2/13/2026The Manufacturers Life Insurance Company 36,919$1.07M0.0%+3.6%0.015%Search for SEC Filing on Google Icon
2/13/2026Avenir Corp850,944$24.68M2.7%-1.3%0.349%Search for SEC Filing on Google Icon
2/13/2026Soros Fund Management LLC109,303$3.17M0.0%N/A0.045%Search for SEC Filing on Google Icon
2/13/2026Bridgewater Associates LP18,251$0.53M0.0%N/A0.007%Search for SEC Filing on Google Icon
2/13/2026Williams Jones Wealth Management LLC.35,492$1.03M0.0%-3.3%0.015%Search for SEC Filing on Google Icon
2/13/2026Brightline Capital Management LLC1,392,000$40.37M16.3%+16.0%0.571%Search for SEC Filing on Google Icon
2/13/2026Stifel Financial Corp30,550$0.89M0.0%-13.8%0.013%Search for SEC Filing on Google Icon
2/13/2026Ridge Creek Global Inc70,888$2.06M1.7%N/A0.029%Search for SEC Filing on Google Icon
2/13/2026Quarry LP2,063$60K0.0%+209.8%0.001%Search for SEC Filing on Google Icon
2/13/2026Advyzon Investment Management LLC12,276$0.36M0.0%+17.1%0.005%Search for SEC Filing on Google Icon
2/13/2026Paragon Capital Management LLC43,730$1.27M0.6%-9.0%0.018%Search for SEC Filing on Google Icon
2/13/2026Morgan Stanley2,075,352$60.19M0.0%+14.9%0.851%Search for SEC Filing on Google Icon
2/13/2026Public Sector Pension Investment Board530,566$15.39M0.1%-11.3%0.218%Search for SEC Filing on Google Icon
2/13/2026First Trust Advisors LP377,828$10.96M0.0%+879.1%0.155%Search for SEC Filing on Google Icon
2/13/2026North Growth Management Ltd.98,000$2.84M0.4%+1.0%0.040%Search for SEC Filing on Google Icon
2/13/2026OpenArc Corporate Advisory LLC200,325$5.81M0.1%N/A0.082%Search for SEC Filing on Google Icon
2/13/2026Tower Bridge Advisors34,182$0.99M0.1%-8.1%0.014%Search for SEC Filing on Google Icon
2/13/2026Charles Schwab Investment Management Inc.1,952,002$56.61M0.0%+6.0%0.800%Search for SEC Filing on Google Icon
2/13/2026Police & Firemen s Retirement System of New Jersey66,654$1.93M0.0%-7.0%0.027%Search for SEC Filing on Google Icon
2/13/2026State Street Corp5,061,620$146.79M0.0%-25.9%2.075%Search for SEC Filing on Google Icon
2/13/2026Van ECK Associates Corp531,007$15.40M0.0%-30.6%0.218%Search for SEC Filing on Google Icon
2/13/2026Ieq Capital LLC38,025$1.10M0.0%N/A0.016%Search for SEC Filing on Google Icon
2/13/2026First National Bank of Omaha177,700$5.21M0.2%N/A0.073%Search for SEC Filing on Google Icon
2/13/2026Dynamic Technology Lab Private Ltd30,863$0.90M0.2%+67.2%0.013%Search for SEC Filing on Google Icon
2/13/2026UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC253,016$7.34M0.0%-9.0%0.104%Search for SEC Filing on Google Icon
2/13/2026Wells Fargo & Company MN464,739$13.48M0.0%+970.0%0.191%Search for SEC Filing on Google Icon
2/13/2026Ruane Cunniff & Goldfarb L.P.2,394,129$69.43M1.1%-1.2%0.981%Search for SEC Filing on Google Icon
2/13/2026Hyperion Capital Advisors LP491,872$14.26M7.0%+17.1%0.202%Search for SEC Filing on Google Icon
2/12/2026Advisors Asset Management Inc.21,078$0.61M0.0%-32.1%0.009%Search for SEC Filing on Google Icon
2/12/2026CI Investments Inc.425,528$12.34M0.1%-0.6%0.175%Search for SEC Filing on Google Icon
2/12/2026Federation des caisses Desjardins du Quebec1,485$43K0.0%-19.5%0.001%Search for SEC Filing on Google Icon
2/12/2026Commonwealth Equity Services LLC16,511$0.48M0.0%-7.1%0.007%Search for SEC Filing on Google Icon
2/12/2026Dimensional Fund Advisors LP1,832,926$53.16M0.0%+40.3%0.752%Search for SEC Filing on Google Icon
2/12/2026Ensign Peak Advisors Inc9,386$0.27M0.0%-68.7%0.004%Search for SEC Filing on Google Icon
2/12/2026Marex Group plc13,002$0.38M0.0%N/A0.005%Search for SEC Filing on Google Icon
2/12/2026New York State Common Retirement Fund535,218$15.52M0.0%-18.8%0.220%Search for SEC Filing on Google Icon
2/12/2026Granite Investment Partners LLC13,248$0.38M0.0%-10.2%0.005%Search for SEC Filing on Google Icon
2/12/2026CIBC Private Wealth Group LLC3,139$91K0.0%-40.8%0.001%Search for SEC Filing on Google Icon
2/12/2026Wilmington Savings Fund Society FSB26,869$0.78M0.0%+30.6%0.011%Search for SEC Filing on Google Icon
2/12/2026Bank of Montreal Can19,409$0.56M0.0%-10.2%0.008%Search for SEC Filing on Google Icon
2/12/2026Loomis Sayles & Co. L P1,118,930$32.45M0.0%+5.2%0.459%Search for SEC Filing on Google Icon
2/12/2026HM Payson & Co.1,941$56K0.0%+58.3%0.001%Search for SEC Filing on Google Icon
2/12/2026South Dakota Investment Council123,037$3.57M0.1%+91.0%0.050%Search for SEC Filing on Google Icon
2/12/2026ASO GROUP Ltd17,724$0.51M0.2%N/A0.007%Search for SEC Filing on Google Icon
2/12/2026Swiss National Bank311,791$9.04M0.0%+1.7%0.128%Search for SEC Filing on Google Icon
2/12/2026Nuveen LLC813,774$23.60M0.0%+8.3%0.334%Search for SEC Filing on Google Icon
2/12/2026Xponance LLC8,438$0.25M0.0%N/A0.003%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: $27.94
Low: $27.33
High: $28.50

50 Day Range

MA: $32.59
Low: $27.94
High: $37.58

52 Week Range

Now: $27.94
Low: $16.01
High: $38.11

Volume

1,720,008 shs

Average Volume

1,875,875 shs

Market Capitalization

$6.82 billion

P/E Ratio

69.85

Dividend Yield

N/A

Beta

0.23

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. — 8.95%
  2. Vanguard Group Inc. — 6.32%
  3. Primecap Management Co. CA — 4.98%
  4. Legacy Advisors LLC — 4.03%
  5. State Street Corp — 2.08%
  6. Focus Partners Wealth — 1.15%
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. State Street Corp
  2. Thompson Siegel & Walmsley LLC
  3. Millennium Management LLC
  4. 683 Capital Management LLC
  5. Invesco Ltd.
  6. Verition Fund Management LLC
  7. Van ECK Associates Corp
  8. Penn Capital Management Company LLC

Which major investors are buying Amentum stock?

In the previous quarter, AMTM stock was bought by institutional investors including:
  1. Legacy Advisors LLC
  2. Focus Partners Wealth
  3. Norges Bank
  4. AQR Capital Management LLC
  5. ExodusPoint Capital Management LP
  6. Dimensional Fund Advisors LP
  7. M&T Bank Corp
  8. Wells Fargo & Company MN
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.