---
schema_version: "secwatch.filing_event.v1"
accession: "0000887343-23-000304"
form_type: "8-K"
ticker: "COLB"
cik: "0000887343"
company_name: "COLUMBIA BANKING SYSTEM, INC."
filed_at: "2023-10-18T23:59:59+00:00"
generated_at: "2026-06-09T22:16:27.632616+00:00"
event_type: "earnings"
sentiment: "neutral"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Columbia Banking Q3 net income $135.8M, EPS $0.65; cost synergies exceed target

## Summary
- GAAP net income of $135.8M ($0.65 diluted EPS) vs Q2 net income of $133.4M ($0.64).
- Operating net income $164.3M ($0.79 diluted EPS); operating ROTCE 20.48%.
- Net interest margin 3.91%, down 2 bps from Q2 on higher funding costs.
- Total deposits $41.6B, up from $40.8B in Q2; loan growth $121M (excluding $159M mortgage sale).
- Annualized cost synergies reached $140M, exceeding original $135M target; non-interest expense down $24M.

## SEC filing metadata
- accession: 0000887343-23-000304
- form_type: 8-K
- ticker: COLB
- cik: 0000887343
- company_name: COLUMBIA BANKING SYSTEM, INC.
- filed_at: 2023-10-18T23:59:59+00:00
- event_type: earnings
- sentiment: neutral
- 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/887343/000088734323000304/0000887343-23-000304-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/887343/000088734323000304/colb-20231018.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000887343-23-000304
- JSON: https://secwatch.observer/filing/0000887343-23-000304.json
- Plain text: https://secwatch.observer/filing/0000887343-23-000304.txt

## Key facts
- Earnings Releases
  COLUMBIA BANKING SYSTEM, INC. reported financial results for third quarter 2023.
  - Period: third quarter 2023
  - Result: reported results
  source text: On October 18, 2023, Columbia Banking System, Inc. issued a press release announcing third quarter 2023 financial results.
  evidence_url: https://www.sec.gov/Archives/edgar/data/887343/000088734323000304/0000887343-23-000304-index.htm

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