---
schema_version: "secwatch.filing_event.v1"
accession: "0001140361-23-025497"
form_type: "8-K"
ticker: "KNF"
cik: "0001955520"
company_name: "Knife River Corp"
filed_at: "2023-05-18T23:59:59+00:00"
generated_at: "2026-06-14T21:34:35.927405+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "medium"
source: SEC EDGAR
---

# Knife River holds investor day; spin-off from MDU Resources effective May 31, 2023

## Summary
- Separation via pro rata distribution of ~90% of Knife River Holding Company common stock to MDU Resources stockholders.
- Distribution effective 11:59 p.m. EDT on May 31, 2023.
- Investor day held May 18, 2023; presentation furnished as Exhibit 99.1.
- Knife River to become standalone public company under ticker KNF.

## SEC filing metadata
- accession: 0001140361-23-025497
- form_type: 8-K
- ticker: KNF
- cik: 0001955520
- company_name: Knife River Corp
- filed_at: 2023-05-18T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: medium
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1955520/000114036123025497/0001140361-23-025497-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1955520/000114036123025497/brhc20053166_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001140361-23-025497
- JSON: https://secwatch.observer/filing/0001140361-23-025497.json
- Plain text: https://secwatch.observer/filing/0001140361-23-025497.txt

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