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Amentum Holdings, Inc. — DEFA14A Filings

2 DEFA14A filings on record

This page lists all DEFA14A filings submitted to the SEC by Amentum Holdings, Inc. (AMTM), sorted by most recent first. Each row links to the full filing on EdgarLookup. Amentum Holdings, Inc. has filed 2 DEFA14A documents with the SEC since 2024. To view all SEC filings by Amentum Holdings, Inc., see the full filings list.

Overview All Filings Financials Insiders
All 10-12B 10-12B/A 10-K 10-Q 3 3/A 4 4/A 424B4 8-K 8-K/A ARS CERT CORRESP DEF 14A DEFA14A DRS DRS/A DRSLTR EFFECT S-1 S-3ASR S-8 SC 13D SC 13G SC 13G/A SCHEDULE 13D SCHEDULE 13D/A SCHEDULE 13G/A SEC STAFF ACTION UPLOAD
Form Description Accession Number Filed Period
DEFA14A DEFA14A 0001104659-25-123126 Dec 19, 2025 —
DEFA14A DEFA14A 0002011286-25-000026 Jan 21, 2025 —