---
schema_version: "secwatch.filing_event.v1"
accession: "0000067716-23-000062"
form_type: "8-K"
ticker: "MDU"
cik: "0000067716"
company_name: "MDU RESOURCES GROUP INC"
filed_at: "2023-05-04T23:59:59+00:00"
generated_at: "2026-06-15T23:24:02.362185+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# MDU Resources Board OKs Knife River Spin-Off; Distribution of 1 KNF per 4 MDU

## Summary
- Each MDU stockholder receives 1 share of Knife River (KNF) for every 4 MDU shares held on record date May 22, 2023.
- Distribution effective 11:59 p.m. ET May 31, 2023; when-issued trading of KNF starts May 25 on NYSE.
- MDU retains ~10% of KNF shares post-distribution; plans to divest via exchange for debt or additional distributions.
- Knife River reported $2.5B revenue in 2022; will trade on NYSE under 'KNF' as independent company.
- Distribution expected tax-free for U.S. federal income tax purposes; fractional shares cashed out.

## SEC filing metadata
- accession: 0000067716-23-000062
- form_type: 8-K
- ticker: MDU
- cik: 0000067716
- company_name: MDU RESOURCES GROUP INC
- filed_at: 2023-05-04T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/67716/000006771623000062/0000067716-23-000062-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/67716/000006771623000062/mdu-20230503.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000067716-23-000062
- JSON: https://secwatch.observer/filing/0000067716-23-000062.json
- Plain text: https://secwatch.observer/filing/0000067716-23-000062.txt

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