---
schema_version: "secwatch.filing_event.v1"
accession: "0000887343-25-000242"
form_type: "8-K/A"
ticker: "COLB"
cik: "0000887343"
company_name: "COLUMBIA BANKING SYSTEM, INC."
filed_at: "2025-09-03T23:59:59+00:00"
generated_at: "2026-05-17T08:42:06.193675+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Columbia Banking closes $2.38B Pacific Premier acquisition; pro forma assets $68.9B

## Summary
- Total consideration ~$2.38B: 88.9M COLB shares issued, exchange ratio 0.915, based on COLB closing price $26.77.
- Pro forma combined assets $68.9B, loans $48.6B, deposits $56.2B as of June 30, 2025.
- Pro forma 2024 net income $669M, diluted EPS $2.24; 2025 H1 net income $365M, diluted EPS $1.22.
- Preliminary goodwill ~$502M; $185M in merger-related expenses included in pro forma adjustments.
- Core deposit intangible of $414M recognized; fair value marks on Pacific Premier loans, securities, and deposits.

## SEC filing metadata
- accession: 0000887343-25-000242
- form_type: 8-K/A
- ticker: COLB
- cik: 0000887343
- company_name: COLUMBIA BANKING SYSTEM, INC.
- filed_at: 2025-09-03T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/887343/000088734325000242/0000887343-25-000242-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/887343/000088734325000242/colb-20250902.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000887343-25-000242
- JSON: https://secwatch.observer/filing/0000887343-25-000242.json
- Plain text: https://secwatch.observer/filing/0000887343-25-000242.txt

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