Alpha Profiles · Company Profile

Amentum Holdings, Inc.

Canonical company identity and public leadership record.

https://registry.alpha.ac/companies/amentum-holdings-inc

Entity: Public listing published
Primary listing: NYSE: AMTM
Verification: Partially verified
Last reviewed: 2026-09-13T04:45:40.900436+00:00

Overview

Alpha's canonical identity and public leadership record for Amentum Holdings, Inc..

Canonical AEGIS identity graph

Executive leadership

Current, confirmed roles are shown only when both the person Profile and supporting source record satisfy the public projection boundary. A missing role is not evidence that it does not exist.

Executive team

8 public records

Arnette

Named Executive Officer

State: confirmed
Effective: From Dec 19, 2025
Confidence: 94%
Evidence: AMTM DEF 14A executive officersDec 19, 2025

Demetriou

Named Executive Officer

State: confirmed
Effective: From Dec 19, 2025
Confidence: 94%
Evidence: AMTM DEF 14A executive officersDec 19, 2025

John Heller

Chief Executive Officer

State: confirmed
Effective: Date not stated
Confidence: 94%
Evidence: AMTM executive roster sourceJul 11, 2026

Michele T. St. Mary

Chief Legal Officer, General Counsel and Corporate Secretary

State: confirmed
Effective: From Dec 19, 2025
Confidence: 94%
Evidence: AMTM DEF 14A executive officersDec 19, 2025

Mullen

Named Executive Officer

State: confirmed
Effective: From Dec 19, 2025
Confidence: 94%
Evidence: AMTM DEF 14A executive officersDec 19, 2025

Steven J. Demetriou

Named Executive Officer

State: confirmed
Effective: Date not stated
Confidence: 94%
Evidence: AMTM executive roster sourceJul 11, 2026

Todd B. Johnson

Executive Vice President Chief Financial Officer

State: confirmed
Effective: From Dec 19, 2025
Confidence: 94%
Evidence: AMTM DEF 14A executive officersDec 19, 2025

Travis B. Johnson

Executive Vice President Chief Financial Officer

State: confirmed
Effective: Date not stated
Confidence: 94%
Evidence: AMTM executive roster sourceMay 3, 2026

Governance leadership

Boards & Committees

Board and committee assignments appear only when the canonical public projection retains a current role and supporting source. Unpublished records are not interpreted as absence.

Record as of Sep 13, 2026. Chair, executive office, Lead Independent Director and committee appointments retain their separate source roles. A complete board composition denominator and committee charters are not established by a partial roster.