---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-005000"
form_type: "8-K"
ticker: "COLB"
cik: "0000887343"
company_name: "COLUMBIA BANKING SYSTEM, INC."
filed_at: "2023-01-10T23:59:59+00:00"
generated_at: "2026-06-20T17:22:11.014721+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Columbia-Umpqua merger gets FDIC approval; closing by end of Feb 2023

## Summary
- FDIC approved bank merger of Columbia State Bank into Umpqua Bank, final regulatory approval.
- Merger expected to close by end of February; outside date extended to March 11, 2023.
- Combined company to have >$50B assets, operate in eight western states, trade under COLB.
- Branch divestitures of 10 branches required as condition; previously announced.

## SEC filing metadata
- accession: 0001193125-23-005000
- form_type: 8-K
- ticker: COLB
- cik: 0000887343
- company_name: COLUMBIA BANKING SYSTEM, INC.
- filed_at: 2023-01-10T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 1.01, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/887343/000119312523005000/0001193125-23-005000-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/887343/000119312523005000/d124899d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-005000
- JSON: https://secwatch.observer/filing/0001193125-23-005000.json
- Plain text: https://secwatch.observer/filing/0001193125-23-005000.txt

## Key facts
- Material Agreements
  COLUMBIA BANKING SYSTEM, INC. amended Amendment No. 1 to Agreement and Plan of Merger with Umpqua Holdings Corporation and Cascade Merger Sub, Inc. (effective 2023-01-09).
  - Action: amendment
  - Agreement: merger
  - Counterparty: Umpqua Holdings Corporation and Cascade Merger Sub, Inc.
  - Effective: 2023-01-09
  source text: On January 9, 2023, Columbia Banking System, Inc., a Washington corporation (“Columbia”), Umpqua Holdings Corporation, an Oregon corporation (“Umpqua”), and Cascade Merger Sub, Inc., a Delaware corporation and a direct, wholly-owned subsidiary of Columbia (“Merger Sub”), entered into Amendment No. 1 (the “Amendment”) to the Agreement and Plan of Merger, dated as of October 11, 2021 (the “Merger Agreement”), by and among Columbia, Umpqua, and Merger Sub.
  evidence_url: https://www.sec.gov/Archives/edgar/data/887343/000119312523005000/0001193125-23-005000-index.htm

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