---
schema_version: "secwatch.filing_event.v1"
accession: "0000887343-24-000024"
form_type: "8-K"
ticker: "COLB"
cik: "0000887343"
company_name: "COLUMBIA BANKING SYSTEM, INC."
filed_at: "2024-01-24T23:59:59+00:00"
generated_at: "2026-06-06T19:42:17.856937+00:00"
event_type: "earnings"
sentiment: "negative"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Columbia Banking Q4 net income $93.5M, EPS $0.45; NIM contracts to 3.78%

## Summary
- GAAP EPS $0.45, operating EPS $0.44; net income $93.5M, down from $135.8M in Q3 2023.
- Net interest margin 3.78%, down 13 bps QoQ as deposit costs rose; cost of deposits increased 53 bps to 2.54%.
- Non-interest expense included $33M FDIC special assessment ($0.12 per share); efficiency ratio 64.81%.
- Loans grew $271M (3% annualized); deposits flat; book value per share rose 8% to $23.95.
- Annualized cost synergies from Umpqua merger reached $143M, exceeding $135M target by 6%.

## SEC filing metadata
- accession: 0000887343-24-000024
- form_type: 8-K
- ticker: COLB
- cik: 0000887343
- company_name: COLUMBIA BANKING SYSTEM, INC.
- filed_at: 2024-01-24T23:59:59+00:00
- event_type: earnings
- sentiment: negative
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 2.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/887343/000088734324000024/0000887343-24-000024-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/887343/000088734324000024/colb-20240124.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000887343-24-000024
- JSON: https://secwatch.observer/filing/0000887343-24-000024.json
- Plain text: https://secwatch.observer/filing/0000887343-24-000024.txt

## Key facts
- Earnings Releases
  COLUMBIA BANKING SYSTEM, INC. reported financial results for fourth quarter and full year 2023.
  - Period: fourth quarter and full year 2023
  - Result: reported results
  source text: Columbia Banking System, Inc. issued a press release announcing fourth quarter and full year 2023 financial results.
  evidence_url: https://www.sec.gov/Archives/edgar/data/887343/000088734324000024/0000887343-24-000024-index.htm

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