---
schema_version: "secwatch.filing_event.v1"
accession: "0000887343-25-000212"
form_type: "8-K"
ticker: "COLB"
cik: "0000887343"
company_name: "COLUMBIA BANKING SYSTEM, INC."
filed_at: "2025-07-22T23:59:59+00:00"
generated_at: "2026-05-18T04:50:00.652626+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Columbia Banking and Pacific Premier shareholders approve proposed acquisition

## Summary
- Columbia shareholders approved issuance of common stock: 183,261,639 for, 291,911 against (99.8% of votes cast).
- Pacific Premier stockholders also approved the merger at their special meeting on July 21, 2025.
- Deal expected to close later in 2025, subject to receipt of remaining regulatory approvals and customary conditions.
- Combined entity to enhance market leadership across the West; teams preparing for swift closing.

## SEC filing metadata
- accession: 0000887343-25-000212
- form_type: 8-K
- ticker: COLB
- cik: 0000887343
- company_name: COLUMBIA BANKING SYSTEM, INC.
- filed_at: 2025-07-22T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 5.07, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/887343/000088734325000212/0000887343-25-000212-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/887343/000088734325000212/colb-20250721.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000887343-25-000212
- JSON: https://secwatch.observer/filing/0000887343-25-000212.json
- Plain text: https://secwatch.observer/filing/0000887343-25-000212.txt

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