---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-028132"
form_type: "8-K/A"
ticker: "CNR"
cik: "0001710366"
company_name: "Core Natural Resources, Inc."
filed_at: "2025-02-18T23:59:59+00:00"
generated_at: "2026-05-26T16:48:57.276357+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.1
confidence: "low"
source: SEC EDGAR
---

# Core Natural Resources files amendment to include Arch financials in 8-K

## Summary
- Amendment adds audited Arch financials for 2023, 2022, 2021 and unaudited 2024 nine-month period.
- Includes pro forma combined financials as of Sept 30, 2024 and for year ended Dec 31, 2023.
- No new material changes; original 8-K merger close on Jan 14, 2025 unchanged.

## SEC filing metadata
- accession: 0001193125-25-028132
- form_type: 8-K/A
- ticker: CNR
- cik: 0001710366
- company_name: Core Natural Resources, Inc.
- filed_at: 2025-02-18T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.1
- confidence: low
- sec_items: 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1710366/000119312525028132/0001193125-25-028132-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1710366/000119312525028132/d900101d8ka.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-028132
- JSON: https://secwatch.observer/filing/0001193125-25-028132.json
- Plain text: https://secwatch.observer/filing/0001193125-25-028132.txt

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