---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-24-221432"
form_type: "8-K"
ticker: "AMTM"
cik: "0002011286"
company_name: "Amentum Holdings, Inc."
filed_at: "2024-09-18T23:59:59+00:00"
generated_at: "2026-05-31T04:04:27.219352+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.85
calibrated_materiality_score: 0.85
confidence: "high"
source: SEC EDGAR
---

# Amazon Holdco spin-off cleared by SEC; merger with Amentum expected Sept 27; AMTM to trade

## Summary
- SEC declared effective Registration Statement on Form 10 for spin-off of Amazon Holdco (to be renamed Amentum Holdings).
- Record date for distribution: Sept 23, 2024; spin-off and merger with Amentum expected Sept 27, 2024.
- Post-close ownership: Jacobs shareholders 51%, Jacobs 7.5%, Amentum Equityholder 37%; 4.5% in escrow as contingent consideration.
- When-issued trading (AMTM WI) starts Sept 24; regular-way (AMTM) starts Sept 30.
- Jacobs intends to dispose of its 7.5% stake in the combined company within 12 months of distribution.

## SEC filing metadata
- accession: 0001193125-24-221432
- form_type: 8-K
- ticker: AMTM
- cik: 0002011286
- company_name: Amentum Holdings, Inc.
- filed_at: 2024-09-18T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.85
- calibrated_materiality_score: 0.85
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2011286/000119312524221432/0001193125-24-221432-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2011286/000119312524221432/d890714d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-24-221432
- JSON: https://secwatch.observer/filing/0001193125-24-221432.json
- Plain text: https://secwatch.observer/filing/0001193125-24-221432.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.