Amentum Holdings Ownership

Who are the major shareholders and have insiders been buying or selling?

Recent Insider Transactions

NYSE:AMTM Recent Insider Transactions by Companies or Individuals
Date	Value	Name	Entity	Role	Shares	Max Price
18 Feb 25	BuyUS$97,635	Barbara Loughran	Individual		4,600	US$21.23
12 Feb 25	BuyUS$2,080,700	Steven Demetriou	Individual		100,000	US$20.81

Insider Trading Volume

Insider Buying: AMTM insiders have bought more shares than they have sold in the past 3 months.

Ownership Breakdown

What is the ownership structure of AMTM?
Owner Type	Number of Shares	Ownership Percentage
Public Companies	0	0%
State or Government	99,616	0.0409%
Individual Insiders	1,222,285	0.502%
Private Companies	2,433,022	1%
General Public	18,530,037	7.62%
VC/PE Firms	87,787,808	36.1%
Institutions	133,229,658	54.8%

Dilution of Shares: AMTM only recently listed within the past 12 months

Top Shareholders

Top 25 shareholders own 79.01% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
18%	American Securities LLC	43,893,904	US$974.0m	0%	100.0%
18%	Lindsay Goldberg LLC	43,893,904	US$974.0m	0%	100.0%
6.89%	BlackRock, Inc.	16,774,623	US$372.2m	88.1%	0.01%
6.8%	The Vanguard Group, Inc.	16,542,447	US$367.1m	18.1%	0.01%
6.08%	Kovitz Investment Group Partners, LLC	14,787,345	US$328.1m	10,900%	1.14%
4.99%	Invesco Ltd.	12,143,956	US$269.5m	841%	0.07%
2.65%	State Street Global Advisors, Inc.	6,454,253	US$143.2m	-11.9%	0.01%
2.64%	PRIMECAP Management Company	6,414,379	US$142.3m	21.7%	0.11%
1.71%	Cooper Creek Partners Management LLC	4,157,034	US$92.2m	396%	3.3%
1%	Ruane, Cunniff & Goldfarb L.P.	2,436,294	US$54.1m	-3.72%	0.72%
1%	Amentum Joint Venture LP	2,433,022	US$54.0m	0%	no data
0.96%	FMR LLC	2,342,855	US$52.0m	13,100%	no data
0.96%	Wellington Management Group LLP	2,333,221	US$51.8m	150%	0.01%
0.81%	Geode Capital Management, LLC	1,963,248	US$43.6m	-37.6%	no data
0.8%	Thompson, Siegel & Walmsley LLC	1,948,684	US$43.2m	469%	0.5%
0.74%	Fidelity International Ltd	1,793,553	US$39.8m	144%	0.02%
0.7%	Invesco Capital Management LLC	1,712,283	US$38.0m	-73.7%	0.01%
0.66%	Thrivent Investment Management Inc.	1,611,796	US$35.8m	201%	0.07%
0.59%	Norges Bank Investment Management	1,440,127	US$32.0m	0%	no data
0.58%	UBS Asset Management AG	1,405,478	US$31.2m	27.7%	no data
0.52%	Charles Schwab Investment Management, Inc.	1,264,257	US$28.1m	0%	no data
0.49%	Millennium Management LLC	1,196,574	US$26.6m	78.1%	0.02%
0.47%	Dimensional Fund Advisors LP	1,154,130	US$25.6m	-8.35%	no data
0.47%	Van Eck Associates Corporation	1,132,285	US$25.1m	2,570%	0.02%
0.41%	Castalian Partners, LLC	1,000,000	US$22.2m	0%	21.33%

Company Analysis and Financial Data Status

Data	Last Updated (UTC time)
Company Analysis	2025/04/30 07:26
End of Day Share Price	2025/04/30 00:00
Earnings	2024/12/27
Annual Earnings	2024/09/27

Data Sources

The data used in our company analysis is from S&P Global Market Intelligence LLC. The following data is used in our analysis model to generate this report. Data is normalised which can introduce a delay from the source being available.

Package	Data	Timeframe	Example US Source ^*
Company Financials	10 years	Income statement Cash flow statement Balance sheet	SEC Form 10-K SEC Form 10-Q
Analyst Consensus Estimates	+3 years	Forecast financials Analyst price targets	Analyst Research Reports Blue Matrix
Market Prices	30 years	Stock prices Dividends, Splits and Actions	ICE Market Data SEC Form S-1
Ownership	10 years	Top shareholders Insider trading	SEC Form 4 SEC Form 13D
Management	10 years	Leadership team Board of directors	SEC Form 10-K SEC Form DEF 14A
Key Developments	10 years	Company announcements	SEC Form 8-K

^* Example for US securities, for non-US equivalent regulatory forms and sources are used.

Unless specified all financial data is based on a yearly period but updated quarterly. This is known as Trailing Twelve Month (TTM) or Last Twelve Month (LTM) Data. Learn more.

Analysis Model and Snowflake

Details of the analysis model used to generate this report is available on our Github page, we also have guides on how to use our reports and tutorials on Youtube.

Learn about the world class team who designed and built the Simply Wall St analysis model.

Industry and Sector Metrics

Our industry and section metrics are calculated every 6 hours by Simply Wall St, details of our process are available on Github.

Analyst Sources

Amentum Holdings, Inc. is covered by 7 analysts. 7 of those analysts submitted the estimates of revenue or earnings used as inputs to our report. Analysts submissions are updated throughout the day.

Analyst	Institution
Andre Madrid	BTIG
Colin Canfield	Cantor Fitzgerald & Co.
Noah Poponak	Goldman Sachs