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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: $23.23
Price Change: ▼ Price Decrease of -0.005 (-0.02%)
As of 05/22/2026 03:59 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
5/19/2026Western Wealth Management LLC1,252$33K0.0%N/A0.001%Search for SEC Filing on Google Icon
5/19/2026Rovida Investment Management Ltd315,000$8.21M1.0%N/A0.129%Search for SEC Filing on Google Icon
5/19/2026Bank of America Corp DE2,405,041$62.72M0.0%+107.8%0.984%Search for SEC Filing on Google Icon
5/18/2026California State Teachers Retirement System184,555$4.81M0.0%+23.1%0.076%Search for SEC Filing on Google Icon
5/18/2026Royal Bank of Canada231,742$6.04M0.0%-13.1%0.095%Search for SEC Filing on Google Icon
5/18/2026Ruane Cunniff & Goldfarb L.P.1,622,982$42.33M0.7%-32.2%0.664%Search for SEC Filing on Google Icon
5/18/2026Empowered Funds LLC7,900$0.21M0.0%N/A0.003%Search for SEC Filing on Google Icon
5/16/2026The Manufacturers Life Insurance Company 40,917$1.07M0.0%+10.8%0.017%Search for SEC Filing on Google Icon
5/16/2026Maverick Capital Ltd.46,335$1.21M0.0%N/A0.019%Search for SEC Filing on Google Icon
5/16/2026Quantinno Capital Management LP145,574$3.80M0.0%+86.7%0.060%Search for SEC Filing on Google Icon
5/15/2026Troluce Capital Advisors LLC1,000,000$26.08M1.6%N/A0.409%Search for SEC Filing on Google Icon
5/15/2026Entropy Technologies LP26,895$0.70M0.0%N/A0.011%Search for SEC Filing on Google Icon
5/14/2026Gabelli Funds LLC69,783$1.82M0.0%+226.3%0.029%Search for SEC Filing on Google Icon
5/14/2026Gamco Investors INC. ET AL95,331$2.49M0.0%+3.8%0.039%Search for SEC Filing on Google Icon
5/14/2026Public Employees Retirement System of Ohio47,842$1.25M0.0%-2.8%0.020%Search for SEC Filing on Google Icon
5/14/2026Sei Investments Co.294,668$7.69M0.0%+35.8%0.121%Search for SEC Filing on Google Icon
5/14/2026State of Wyoming8,302$0.22M0.0%-30.3%0.003%Search for SEC Filing on Google Icon
5/13/2026Cetera Investment Advisers24,375$0.64M0.0%+14.6%0.010%Search for SEC Filing on Google Icon
5/13/2026CI Investments Inc.420,068$10.96M0.1%-1.3%0.172%Search for SEC Filing on Google Icon
5/13/2026First Trust Advisors LP228,083$5.95M0.0%-39.6%0.094%Search for SEC Filing on Google Icon
5/8/2026PNC Financial Services Group Inc.13,674$0.36M0.0%+8.3%0.006%Search for SEC Filing on Google Icon
5/7/2026Dimensional Fund Advisors LP3,787,420$98.77M0.0%+106.6%1.553%Search for SEC Filing on Google Icon
5/7/2026Hahn Capital Management LLC51,120$1.33M0.8%-17.5%0.021%Search for SEC Filing on Google Icon
5/7/2026KBC Group NV5,431$0.14M0.0%-7.1%0.002%Search for SEC Filing on Google Icon
5/7/2026Swiss National Bank313,391$8.17M0.0%+0.5%0.128%Search for SEC Filing on Google Icon
5/6/2026California Public Employees Retirement System277,052$7.23M0.0%-0.6%0.114%Search for SEC Filing on Google Icon
5/6/2026Gryphon Financial Partners LLC18,883$0.49M0.1%+16.0%0.008%Search for SEC Filing on Google Icon
5/6/2026Modera Wealth Management LLC18,402$0.48M0.0%-16.1%0.008%Search for SEC Filing on Google Icon
5/6/2026Bessemer Group Inc.125,952$3.28M0.0%+7,142.8%0.052%Search for SEC Filing on Google Icon
5/5/2026Bank of New York Mellon Corp908,599$23.70M0.0%-1.5%0.372%Search for SEC Filing on Google Icon
5/5/2026Illinois Municipal Retirement Fund83,407$2.18M0.0%N/A0.034%Search for SEC Filing on Google Icon
5/5/2026NFSG Corp1,350$35K0.0%N/A0.001%Search for SEC Filing on Google Icon
5/4/2026Bryn Mawr Trust Advisors LLC116,871$3.05M0.1%+14.6%0.048%Search for SEC Filing on Google Icon
5/4/2026Principal Financial Group Inc.744,728$19.42M0.0%+2.2%0.305%Search for SEC Filing on Google Icon
5/1/2026Fifth Third Bancorp273,316$7.13M0.0%+10,456.8%0.112%Search for SEC Filing on Google Icon
4/28/2026Intrinsic Value Partners LLC13,899$0.36M0.3%-16.7%0.006%Search for SEC Filing on Google Icon
4/28/2026Stephens Inc. AR23,395$0.61M0.0%+3.7%0.010%Search for SEC Filing on Google Icon
4/27/2026Moran Wealth Management LLC19,585$0.51M0.0%N/A0.008%Search for SEC Filing on Google Icon
4/27/2026PFG Investments LLC10,332$0.27M0.0%+9.6%0.004%Search for SEC Filing on Google Icon
4/27/2026New York State Teachers Retirement System165,329$4.31M0.0%-0.4%0.068%Search for SEC Filing on Google Icon
4/23/2026Formidable Asset Management LLC13,473$0.35M0.1%+88.1%0.006%Search for SEC Filing on Google Icon
4/22/2026Janney Montgomery Scott LLC12,728$0.33M0.0%N/A0.005%Search for SEC Filing on Google Icon
4/22/2026Pictet Asset Management Holding SA26,893$0.70M0.0%+6.5%0.011%Search for SEC Filing on Google Icon
4/22/2026Sterling Capital Management LLC14,408$0.38M0.0%-18.0%0.006%Search for SEC Filing on Google Icon
4/21/2026Louisiana State Employees Retirement System68,200$1.78M0.0%N/A0.028%Search for SEC Filing on Google Icon
4/20/2026Delphi Management Inc. MA37,873$0.99M1.2%-22.9%0.016%Search for SEC Filing on Google Icon
4/20/2026Legal Advantage Investments Inc.28,900$0.75M0.4%+52.9%0.012%Search for SEC Filing on Google Icon
4/17/2026Telos Capital Management Inc.189,901$4.95M0.5%+1.3%0.078%Search for SEC Filing on Google Icon
4/16/2026SG Americas Securities LLC274,602$7.16M0.0%-20.5%0.113%Search for SEC Filing on Google Icon
4/15/2026Weatherly Asset Management L. P.9,690$0.25M0.0%N/A0.004%Search for SEC Filing on Google Icon
3/17/2026Rockefeller Capital Management L.P.4,412$0.13M0.0%-22.5%0.002%Search for SEC Filing on Google Icon
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
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: $23.23
Low: $22.97
High: $23.72

50 Day Range

MA: $25.86
Low: $22.47
High: $27.94

52 Week Range

Now: $23.23
Low: $19.11
High: $38.11

Volume

1,466,267 shs

Average Volume

2,240,653 shs

Market Capitalization

$5.67 billion

P/E Ratio

38.71

Dividend Yield

N/A

Beta

0.43

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. Dimensional Fund Advisors LP — 1.55%
  2. Bank of America Corp DE — 0.98%
  3. Ruane Cunniff & Goldfarb L.P. — 0.66%
  4. Troluce Capital Advisors LLC — 0.41%
  5. Bank of New York Mellon Corp — 0.37%
  6. Principal Financial Group Inc. — 0.31%
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. Ruane Cunniff & Goldfarb L.P.
  2. First Trust Advisors LP
  3. SG Americas Securities LLC
  4. Royal Bank of Canada
  5. Bank of New York Mellon Corp
  6. Delphi Management Inc. MA
  7. Hahn Capital Management LLC
  8. CI Investments Inc.

Which major investors are buying Amentum stock?

In the previous quarter, AMTM stock was bought by institutional investors including:
  1. Dimensional Fund Advisors LP
  2. Bank of America Corp DE
  3. Troluce Capital Advisors LLC
  4. Rovida Investment Management Ltd
  5. Fifth Third Bancorp
  6. Bessemer Group Inc.
  7. Illinois Municipal Retirement Fund
  8. Sei Investments Co.
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.

Amentum Active Insiders

Steven J Demetriou
Executive Chair