---
schema_version: "secwatch.filing_event.v1"
accession: "0001437749-26-021135"
form_type: "8-K"
ticker: "MRTN"
cik: "0000799167"
company_name: "MARTEN TRANSPORT LTD"
filed_at: "2026-06-18T20:01:54+00:00"
generated_at: "2026-06-18T20:08:59.887767+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Marten Transport amends credit facility, increases letter of credit sublimit to $35M and aggregate capacity to $105M

## Summary
- Letter of credit sublimit raised from $30M to $35M under existing unsecured revolving credit facility.
- Maximum aggregate principal amount increased from $100M to $105M via accordion feature.
- Amended and Restated Revolving Note for $35M replaces prior $30M note; U.S. Bank remains sole lender.
- Facility terms otherwise unchanged; proceeds for general corporate and working capital purposes.

## SEC filing metadata
- accession: 0001437749-26-021135
- form_type: 8-K
- ticker: MRTN
- cik: 0000799167
- company_name: MARTEN TRANSPORT LTD
- filed_at: 2026-06-18T20:01:54+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 1.01, 2.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/799167/000143774926021135/0001437749-26-021135-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/799167/000143774926021135/mrtn20260617_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001437749-26-021135
- JSON: https://secwatch.observer/filing/0001437749-26-021135.json
- Plain text: https://secwatch.observer/filing/0001437749-26-021135.txt

## Key facts
- Debt Financings
  MARTEN TRANSPORT LTD amended credit facility of maximum aggregate principal amount of up to $105 million with U.S. Bank National Association.
  - Instrument: credit facility
  - Principal: maximum aggregate principal amount of up to $105 million
  - Counterparty: U.S. Bank National Association
  - Event: amendment
  source text: On June 12, 2026, Marten entered into the First Amendment to Credit Agreement (the “Amendment”) to increase the sublimit for the issuance of letters of credit from $30 million to $35 million and increase the maximum aggregate principal amount from $100 million to $105 million.
  evidence_url: https://www.sec.gov/Archives/edgar/data/799167/000143774926021135/0001437749-26-021135-index.htm
- Material Agreements
  MARTEN TRANSPORT LTD amended First Amendment to Credit Agreement with U.S. Bank National Association, as agent, and certain banks party thereto (effective 2026-06-12).
  - Action: amendment
  - Agreement: credit facility
  - Counterparty: U.S. Bank National Association, as agent, and certain banks party thereto
  - Effective: 2026-06-12
  source text: On June 12, 2026, Marten entered into the First Amendment to Credit Agreement (the “Amendment”) to increase the sublimit for the issuance of letters of credit from $30 million to $35 million and increase the maximum aggregate principal amount from $100 million to $105 million.
  evidence_url: https://www.sec.gov/Archives/edgar/data/799167/000143774926021135/0001437749-26-021135-index.htm

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