---
schema_version: "secwatch.filing_event.v1"
accession: "0001733998-25-000142"
form_type: "8-K"
ticker: "NWN"
cik: "0001733998"
company_name: "Northwest Natural Holding Co"
filed_at: "2025-08-26T23:59:59+00:00"
generated_at: "2026-05-17T09:58:14.028343+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# NWN subsidiary SiEnergy issues $185M in senior notes across three tranches

## Summary
- SiEnergy issues $50M 4.86% Series A notes due 2030, $40M 5.42% Series B due 2035, $95M 6.04% Series C due 2055.
- Notes sold via private placement to institutional investors; interest payable semi-annually starting Dec 15, 2025.
- Proceeds to be used for general corporate purposes, including repayment of existing credit agreement debt.
- NW Holdings is not a party and has not guaranteed the obligations; notes secured by first-priority lien on SiEnergy assets.
- Notes require SiEnergy to maintain a consolidated indebtedness-to-total capitalization ratio of 70% or less.

## SEC filing metadata
- accession: 0001733998-25-000142
- form_type: 8-K
- ticker: NWN
- cik: 0001733998
- company_name: Northwest Natural Holding Co
- filed_at: 2025-08-26T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1733998/000173399825000142/0001733998-25-000142-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1733998/000173399825000142/nwn-20250825.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001733998-25-000142
- JSON: https://secwatch.observer/filing/0001733998-25-000142.json
- Plain text: https://secwatch.observer/filing/0001733998-25-000142.txt

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