---
schema_version: "secwatch.filing_event.v1"
accession: "0001260221-25-000025"
form_type: "8-K"
ticker: "TDG"
cik: "0001260221"
company_name: "TransDigm Group INC"
filed_at: "2025-05-06T23:59:59+00:00"
generated_at: "2026-05-22T11:05:00.361303+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# TransDigm CEO Kevin Stein to retire Sept 30, 2025; COO Mike Lisman named successor

## Summary
- Kevin Stein retires as President & CEO effective Sept 30, 2025; will remain as advisor through March 2026 and continue on board.
- Mike Lisman, current Co-COO, appointed President & CEO; previously served as CFO and led M&A at TransDigm.
- Chairman cites planned succession following Stein's ~11-year tenure generating shareholder value.
- Lisman holds B.S. in aerospace engineering from Notre Dame and MBA from Harvard Business School.

## SEC filing metadata
- accession: 0001260221-25-000025
- form_type: 8-K
- ticker: TDG
- cik: 0001260221
- company_name: TransDigm Group INC
- filed_at: 2025-05-06T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1260221/000126022125000025/0001260221-25-000025-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1260221/000126022125000025/tdg-20250506.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001260221-25-000025
- JSON: https://secwatch.observer/filing/0001260221-25-000025.json
- Plain text: https://secwatch.observer/filing/0001260221-25-000025.txt

## Key facts
- Executive change
  Kevin M. Stein retired as President and Chief Executive Officer at TransDigm Group INC.
  - Action: retired
  - Role: President and Chief Executive Officer
  source text: Kevin M. Stein, President and Chief Executive Officer of TransDigm Group Incorporated (the “Company”), notified the Board that he will retire as President and Chief Executive Officer, effective as of September 30, 2025.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1260221/000126022125000025/0001260221-25-000025-index.htm
- Executive change
  Michael J. Lisman was appointed as President and Chief Executive Officer at TransDigm Group INC.
  - Action: appointed
  - Role: President and Chief Executive Officer
  source text: Michael J. Lisman will succeed Mr. Stein as President and Chief Executive Officer.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1260221/000126022125000025/0001260221-25-000025-index.htm

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