---
schema_version: "secwatch.filing_event.v1"
accession: "0001437749-25-004350"
form_type: "8-K"
ticker: "MRTN"
cik: "0000799167"
company_name: "MARTEN TRANSPORT LTD"
filed_at: "2025-02-19T23:59:59+00:00"
generated_at: "2026-05-26T12:46:07.610026+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.25
calibrated_materiality_score: 0.25
confidence: "high"
source: SEC EDGAR
---

# Director Thomas J. Winkel steps down from Marten Transport board at 2025 Annual Meeting

## Summary
- Thomas J. Winkel will not seek reelection at the 2025 Annual Meeting for personal reasons.
- He will continue serving on the Board until the Annual Meeting.
- Winkel stated his decision is not due to any disagreement with the Company.
- No replacement announced; board size will decrease by one after the meeting.

## SEC filing metadata
- accession: 0001437749-25-004350
- form_type: 8-K
- ticker: MRTN
- cik: 0000799167
- company_name: MARTEN TRANSPORT LTD
- filed_at: 2025-02-19T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.25
- calibrated_materiality_score: 0.25
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/799167/000143774925004350/0001437749-25-004350-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/799167/000143774925004350/mrtn20250218_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001437749-25-004350
- JSON: https://secwatch.observer/filing/0001437749-25-004350.json
- Plain text: https://secwatch.observer/filing/0001437749-25-004350.txt

## Key facts
- Executive change
  Thomas J. Winkel departed as Director at MARTEN TRANSPORT LTD.
  - Action: will not seek reelection
  - Role: Director
  source text: On February 13, 2025, Mr. Thomas J. Winkel, a member of the Board of Directors of Marten Transport, Ltd. (the “Company”), notified the Company that he will not seek reelection as a director of the Company at the Company’s upcoming 2025 Annual Meeting of Stockholders for personal reasons.
  evidence_url: https://www.sec.gov/Archives/edgar/data/799167/000143774925004350/0001437749-25-004350-index.htm

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