---
schema_version: "secwatch.filing_event.v1"
accession: "0001260221-25-000084"
form_type: "8-K"
ticker: "TDG"
cik: "0001260221"
company_name: "TransDigm Group INC"
filed_at: "2025-12-31T23:59:59+00:00"
generated_at: "2026-05-16T11:53:14.178247+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.8
calibrated_materiality_score: 0.8
confidence: "high"
source: SEC EDGAR
---

# TransDigm acquires Stellant Systems for ~$960M in cash

## Summary
- TransDigm (NYSE:TDG) agrees to buy Stellant Systems from Arlington Capital Partners for approx. $960M cash, including tax benefits.
- Stellant is a designer/manufacturer of high-power electronic components for aerospace/defense, with ~$300M expected 2025 revenue.
- About 50% of Stellant revenue is aftermarket; nearly all from proprietary products, adding new products/services to TransDigm portfolio.
- Stellant employs ~950 people across four U.S. facilities: Torrance, Williamsport, Melville, and Topsfield.
- Transaction is subject to U.S. regulatory approvals and customary closing conditions.

## SEC filing metadata
- accession: 0001260221-25-000084
- form_type: 8-K
- ticker: TDG
- cik: 0001260221
- company_name: TransDigm Group INC
- filed_at: 2025-12-31T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.8
- calibrated_materiality_score: 0.8
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1260221/000126022125000084/0001260221-25-000084-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1260221/000126022125000084/tdg-20251231.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001260221-25-000084
- JSON: https://secwatch.observer/filing/0001260221-25-000084.json
- Plain text: https://secwatch.observer/filing/0001260221-25-000084.txt

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