---
schema_version: "secwatch.filing_event.v1"
accession: "0000887343-25-000229"
form_type: "8-K"
ticker: "COLB"
cik: "0000887343"
company_name: "COLUMBIA BANKING SYSTEM, INC."
filed_at: "2025-08-06T23:59:59+00:00"
generated_at: "2026-05-17T20:16:58.599822+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Columbia and Pacific Premier receive all regulatory approvals; closing expected August 31, 2025

## Summary
- All required regulatory approvals received from Federal Reserve, FDIC, and Oregon DFB.
- Shareholder approvals obtained July 21, 2025; merger expected to close on or about August 31, 2025.
- All-stock transaction announced April 23, 2025; integration planning underway.
- Clint Stein (Columbia CEO) cites strong shareholder support and expects seamless integration.

## SEC filing metadata
- accession: 0000887343-25-000229
- form_type: 8-K
- ticker: COLB
- cik: 0000887343
- company_name: COLUMBIA BANKING SYSTEM, INC.
- filed_at: 2025-08-06T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 7.01, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/887343/000088734325000229/0000887343-25-000229-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/887343/000088734325000229/colb-20250806.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000887343-25-000229
- JSON: https://secwatch.observer/filing/0000887343-25-000229.json
- Plain text: https://secwatch.observer/filing/0000887343-25-000229.txt

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