---
schema_version: "secwatch.filing_event.v1"
accession: "0001437749-23-034741"
form_type: "8-K"
ticker: "MRTN"
cik: "0000799167"
company_name: "MARTEN TRANSPORT LTD"
filed_at: "2023-12-18T23:59:59+00:00"
generated_at: "2026-06-07T11:33:31.385563+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# Marten Transport appoints Adam Phillips as EVP and COO, effective Dec 13, 2023

## Summary
- Adam Phillips appointed Executive VP and COO effective Dec 13, 2023; base salary $310,000/year.
- Phillips receives $26,539 for accumulated vacation pay; eligible for cash bonus under incentive plan.
- Change-in-control severance: lump sum 100% base salary plus 1x highest bonus in prior 3 years.
- Phillips has served as COO since March 2023; prior roles include President of Western Operations.

## SEC filing metadata
- accession: 0001437749-23-034741
- form_type: 8-K
- ticker: MRTN
- cik: 0000799167
- company_name: MARTEN TRANSPORT LTD
- filed_at: 2023-12-18T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/799167/000143774923034741/0001437749-23-034741-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/799167/000143774923034741/mrtn20231215_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001437749-23-034741
- JSON: https://secwatch.observer/filing/0001437749-23-034741.json
- Plain text: https://secwatch.observer/filing/0001437749-23-034741.txt

## Key facts
- Executive change
  Adam Phillips was appointed as Executive Vice President and Chief Operating Officer at MARTEN TRANSPORT LTD.
  - Action: appointed
  - Role: Executive Vice President and Chief Operating Officer
  source text: On December 13, 2023, the Board of Directors of Marten Transport, Ltd. (the “Company”) approved the appointment of Adam Phillips as its Executive Vice President and Chief Operating Officer.
  evidence_url: https://www.sec.gov/Archives/edgar/data/799167/000143774923034741/0001437749-23-034741-index.htm

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