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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: $18.28
Price Change: ▼ Price Decrease of -0.23 (-1.24%)
As of 10/8/2026 12:09 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
10/6/2026Segra Capital Management LLC774,867$14.04M1.4%-65.4%0.317%Search for SEC Filing on Google Icon
10/1/2026Cacti Asset Management LLC875,097$15.88M0.9%-0.7%0.358%Search for SEC Filing on Google Icon
9/18/2026Security National Bank of Sioux City Iowa IA23,326$0.48M0.2%+31.3%0.010%Search for SEC Filing on Google Icon
9/9/2026WINTON GROUP Ltd58,393$1.21M0.0%+5.2%0.024%Search for SEC Filing on Google Icon
9/9/2026Integrated Wealth Concepts LLC2,405$50K0.0%N/A0.001%Search for SEC Filing on Google Icon
9/8/2026Mraz Amerine & Associates Inc.90,200$1.86M0.3%+25.3%0.037%Search for SEC Filing on Google Icon
9/8/2026Nykredit A S1,800$37K0.0%N/A0.001%Search for SEC Filing on Google Icon
8/27/2026Corient Private Wealth LP27,543$0.57M0.0%-6.7%0.011%Search for SEC Filing on Google Icon
8/26/2026HighTower Advisors LLC14,108$0.29M0.0%-24.2%0.006%Search for SEC Filing on Google Icon
8/25/2026VIRGINIA RETIREMENT SYSTEMS ET Al19,400$0.40M0.0%N/A0.008%Search for SEC Filing on Google Icon
8/23/2026Washington Trust Advisors Inc.3,598$74K0.0%-55.7%0.001%Search for SEC Filing on Google Icon
8/23/2026Ameritas Advisory Services LLC26,747$0.55M0.0%N/A0.011%Search for SEC Filing on Google Icon
8/23/2026Troluce Capital Advisors LLC3,565,399$73.70M7.6%+256.5%1.458%Search for SEC Filing on Google Icon
8/22/2026TD Waterhouse Canada Inc.3,342$67K0.0%-24.9%0.001%Search for SEC Filing on Google Icon
8/21/2026AXQ Capital LP35,915$0.74M0.1%N/A0.015%Search for SEC Filing on Google Icon
8/21/2026Nykredit A S1,800$37K0.0%N/A0.001%Search for SEC Filing on Google Icon
8/20/2026Clifford Swan Investment Counsel LLC17,495$0.36M0.0%-8.9%0.007%Search for SEC Filing on Google Icon
8/20/2026Kerrisdale Advisers LLC59,845$1.24M0.3%+105.0%0.024%Search for SEC Filing on Google Icon
8/20/2026Ancora Advisors LLC715,652$14.79M0.3%+1.8%0.293%Search for SEC Filing on Google Icon
8/20/2026Susquehanna Fundamental Investments LLC394,370$8.15M0.2%+81.1%0.161%Search for SEC Filing on Google Icon
8/20/2026Moore Capital Management LP365,096$7.55M0.1%-58.2%0.149%Search for SEC Filing on Google Icon
8/19/2026UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC249,725$5.16M0.0%+0.7%0.102%Search for SEC Filing on Google Icon
8/19/2026Toth Financial Advisory Corp18,226$0.38M0.0%-18.5%0.007%Search for SEC Filing on Google Icon
8/19/2026Van ECK Associates Corp1,988,898$41.11M0.0%+263.2%0.813%Search for SEC Filing on Google Icon
8/19/2026Hsbc Holdings PLC22,218$0.46M0.0%N/A0.009%Search for SEC Filing on Google Icon
8/18/2026AWH Capital L.P.235,250$4.86M0.0%N/A0.096%Search for SEC Filing on Google Icon
8/18/2026Public Employees Retirement System of Ohio45,464$0.94M0.0%N/A0.019%Search for SEC Filing on Google Icon
8/17/2026Corient Private Wealth LP31,354$0.65M0.0%N/A0.013%Search for SEC Filing on Google Icon
8/17/2026Permian Investment Partners LP1,433,028$29.62M0.0%N/A0.586%Search for SEC Filing on Google Icon
8/17/2026Bank of America Corp DE2,042,897$42.23M0.0%N/A0.836%Search for SEC Filing on Google Icon
8/15/2026Strategic Global Advisors LLC99,103$2.05M0.3%N/A0.041%Search for SEC Filing on Google Icon
8/15/2026Jupiter Topco LLC69,400$1.43M0.0%N/A0.028%Search for SEC Filing on Google Icon
8/14/2026Hsbc Holdings PLC22,218$0.46M0.0%N/A0.009%Search for SEC Filing on Google Icon
8/14/2026Ancora Advisors LLC715,652$14.79M0.3%N/A0.293%Search for SEC Filing on Google Icon
8/14/2026Primecap Management Co. CA12,285,504$253.94M0.2%N/A5.025%Search for SEC Filing on Google Icon
8/14/2026Legal & General Group Plc349,048$7.22M0.0%N/A0.143%Search for SEC Filing on Google Icon
8/14/2026The Manufacturers Life Insurance Company273,618$1.12M0.0%N/A0.112%Search for SEC Filing on Google Icon
8/14/2026Peak Asset Management LLC24,000$0.50M0.1%N/A0.010%Search for SEC Filing on Google Icon
8/14/2026Aberdeen Wealth Management LLC8,291$0.17M0.1%N/A0.003%Search for SEC Filing on Google Icon
8/14/2026Algert Global LLC102,220$2.11M0.0%+1.2%0.042%Search for SEC Filing on Google Icon
8/13/2026Sanctuary Advisors LLC15,732$0.33M0.0%N/A0.006%Search for SEC Filing on Google Icon
8/13/2026Clear Harbor Asset Management LLC31,780$0.66M0.0%N/A0.013%Search for SEC Filing on Google Icon
8/12/2026De Lisle Partners LLP374,818$7.74M0.8%N/A0.153%Search for SEC Filing on Google Icon
8/11/2026Allworth Financial LP9,805$0.20M0.0%N/A0.004%Search for SEC Filing on Google Icon
8/10/2026BOK Financial Private Wealth Inc.5,268$0.11M0.0%N/A0.002%Search for SEC Filing on Google Icon
8/10/2026Danske Bank A S8,536$0.18M0.0%N/A0.003%Search for SEC Filing on Google Icon
8/8/2026First National Bank of Omaha475,992$9.72M0.3%N/A0.195%Search for SEC Filing on Google Icon
8/7/2026BlackRock Inc.17,906,984$370.14M0.0%N/A7.329%Search for SEC Filing on Google Icon
8/7/2026Deutsche Bank AG21,821$0.45M0.0%N/A0.009%Search for SEC Filing on Google Icon
8/7/2026Old West Investment Management LLC32,875$0.68M0.1%N/A0.013%Search for SEC Filing on Google Icon
8/6/2026Global Retirement Partners LLC1,484$31K0.0%N/A0.001%Search for SEC Filing on Google Icon
8/6/2026Bank of New York Mellon Corp878,084$18.15M0.0%N/A0.359%Search for SEC Filing on Google Icon
8/6/2026State of Wyoming17,667$0.37M0.0%N/A0.007%Search for SEC Filing on Google Icon
8/3/2026Oppenheimer Asset Management Inc.24,597$0.51M0.0%N/A0.010%Search for SEC Filing on Google Icon
8/3/2026Bryn Mawr Trust Advisors LLC141,443$2.92M0.1%N/A0.058%Search for SEC Filing on Google Icon
7/10/2026Wedge Capital Management L L P NC187,832$3.88M0.1%+14.1%0.077%Search for SEC Filing on Google Icon
7/10/2026Hudson Value Partners LLC250,185$5.17M1.3%+22.7%0.102%Search for SEC Filing on Google Icon
7/9/2026Steadtrust LLC30,400$0.63M0.3%-33.0%0.012%Search for SEC Filing on Google Icon
7/7/2026GAMMA Investing LLC4,958$0.10M0.0%-12.4%0.002%Search for SEC Filing on Google Icon
6/16/2026Empowered Funds LLC7,900$0.21M0.0%N/A0.003%Search for SEC Filing on Google Icon
6/8/2026Pine Valley Investments Ltd Liability Co79,275$2.07M0.1%+4.5%0.032%Search for SEC Filing on Google Icon
5/27/2026Alpine Woods Capital Investors LLC8,402$0.22M0.1%N/A0.003%Search for SEC Filing on Google Icon
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 Company40,917$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
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: $18.28
Low: $18.10
High: $18.77

50 Day Range

MA: $20.51
Low: $18.13
High: $24.78

52 Week Range

Now: $18.28
Low: $17.72
High: $38.11

Volume

800,581 shs

Average Volume

2,042,524 shs

Market Capitalization

$4.47 billion

P/E Ratio

22.02

Dividend Yield

N/A

Beta

0.31

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. Cacti Asset Management LLC — 0.36%
  2. Segra Capital Management LLC — 0.32%
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. Segra Capital Management LLC
  2. Cacti Asset Management LLC

Amentum Active Insiders

Steven J Demetriou
Executive Chair