---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-094676"
form_type: "8-K"
ticker: "COLB"
cik: "0000887343"
company_name: "COLUMBIA BANKING SYSTEM, INC."
filed_at: "2025-04-25T23:59:59+00:00"
generated_at: "2026-05-23T06:30:39.339566+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.8
calibrated_materiality_score: 0.8
confidence: "high"
source: SEC EDGAR
---

# Columbia Banking to acquire Pacific Premier Bancorp in all-stock merger (0.9150x)

## Summary
- Each PPBI share converts to 0.9150 COLB shares; fractional shares paid in cash.
- Termination fee of $75M payable by either party under specified conditions.
- Three PPBI directors, incl. CEO Steven R. Gardner, to join Columbia board.
- Deal requires approvals from Columbia & Pacific Premier shareholders and regulators (Fed, FDIC, Oregon).
- Columbia will file Form S-4 with joint proxy/prospectus for shareholder votes.

## SEC filing metadata
- accession: 0001193125-25-094676
- form_type: 8-K
- ticker: COLB
- cik: 0000887343
- company_name: COLUMBIA BANKING SYSTEM, INC.
- filed_at: 2025-04-25T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.8
- calibrated_materiality_score: 0.8
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/887343/000119312525094676/0001193125-25-094676-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/887343/000119312525094676/d677345d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-094676
- JSON: https://secwatch.observer/filing/0001193125-25-094676.json
- Plain text: https://secwatch.observer/filing/0001193125-25-094676.txt

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