Amentum  Inc. logo

Amentum Inc.

AMTM | NYSE
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$19.90
+$0.30 (+1.53%)
At close: Sep 21, 2026, 4:00 PM ET
$19.90
$0 (0.00%)
Pre-market: Sep 22, 2026, 5:27 AM ET

Company Profile

Amentum Holdings, Inc. is a provider of critical, technology-driven services, serving both governmental and commercial sectors. Its operations are structured around two distinct segments: Critical Mission Solutions and Cyber & Intelligence. The Critical Mission Solutions (CMS) segment delivers comprehensive support across various domains. This includes testing, training, and operational oversight for advanced missile defense systems. It also furnishes IT and engineering expertise to both defense organizations and the burgeoning space sector. Moreover, CMS offers technological solutions to energy clients, encompassing installation, decommissioning, and vital environmental remediation efforts, in addition to specialized technical consulting services. Meanwhile, the Cyber & Intelligence (C&I) segment focuses on advanced cyber training and sophisticated data analytics for government professionals. It also deploys cutting-edge communication systems and aerial mapping technologies for national security applications, alongside other specialized technical support for U.S. defense and intelligence agencies. Established on November 26, 2019, the company maintains its corporate headquarters in Chantilly, VA.

Key Executives

Name Position
John E. Heller Chief Executive Officer & Director
Jill Bruning Chief Technology Officer
Luis German Chief Information Officer
Michele Mary Chief Legal Officer, General Counsel & Corporate Secretary
Stephen Arnette Chief Operating Officer
Travis Barton Johnson Chief Financial Officer
Adam Harrison Senior Vice President of Strategy & Corporate Development
Joseph William DeNardi Senior Vice President & Head of Investor Relations
Karina Vollmer Chief Ethics & Compliance Officer
Roela Santos Chief Marketing & Communications Officer
Sean Mullen Chief Growth Officer
Steven J. Demetriou Executive Chair

Latest SEC Filings

Date Type Title
Aug 11, 2026 10-Q Quarterly Report
Aug 10, 2026 8-K Current Report
Aug 06, 2026 SC 13G Statement of acquisition of beneficial ownership b...
May 12, 2026 10-Q Quarterly Report
May 11, 2026 8-K Current Report
May 07, 2026 4 Filing
May 07, 2026 4 Filing
May 07, 2026 4 Filing
May 07, 2026 4 Filing
May 07, 2026 4 Filing
View All SEC Filings
Amentum Inc.
Amentum  Inc. logo
Country United States
IPO Date Sep 23, 2024
Industry Aerospace & Defense
Sector Industrials
Employees 50,000
CEO John E. Heller

Contact Details

4800 Westfields Blvd Chantilly, Virginia 20151 United States

Stock Details

Ticker Symbol AMTM
Exchange NYSE
Fiscal Year October - September
Reporting Currency USD
CIK Code 0002011286
CUSIP Number 023939101
ISIN Number US0239391016
SIC Code 7389

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