---
schema_version: "secwatch.filing_event.v1"
accession: "0000887343-23-000291"
form_type: "8-K"
ticker: "COLB"
cik: "0000887343"
company_name: "COLUMBIA BANKING SYSTEM, INC."
filed_at: "2023-07-19T23:59:59+00:00"
generated_at: "2026-06-13T06:44:43.444680+00:00"
event_type: "earnings"
sentiment: "neutral"
materiality_score: 0.85
calibrated_materiality_score: 0.85
confidence: "high"
source: SEC EDGAR
---

# Columbia Banking Q2 net income $133M; adjusted EPS $0.81; NIM and FY guidance lowered

## Summary
- GAAP diluted EPS $0.64 vs ($0.09) in Q1; operating EPS $0.81.
- Net interest margin (GAAP) 3.93%, down 15bp QoQ; adjusted NIM 3.32%, down 41bp.
- FY2023 adjusted NIM guidance cut to 3.20-3.40% from 3.55-3.65%.
- Cost synergies of $105M annualized realized; on track for $135M+ by Q3.
- Deposits declined $751M QoQ to $40.8B; loans flat excluding $373M sale.

## SEC filing metadata
- accession: 0000887343-23-000291
- form_type: 8-K
- ticker: COLB
- cik: 0000887343
- company_name: COLUMBIA BANKING SYSTEM, INC.
- filed_at: 2023-07-19T23:59:59+00:00
- event_type: earnings
- sentiment: neutral
- materiality_score: 0.85
- calibrated_materiality_score: 0.85
- confidence: high
- sec_items: 2.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/887343/000088734323000291/0000887343-23-000291-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/887343/000088734323000291/colb-20230719.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000887343-23-000291
- JSON: https://secwatch.observer/filing/0000887343-23-000291.json
- Plain text: https://secwatch.observer/filing/0000887343-23-000291.txt

## Key facts
- Earnings Releases
  COLUMBIA BANKING SYSTEM, INC. reported financial results for second quarter 2023.
  - Period: second quarter 2023
  - Result: reported results
  source text: On July 19, 2023, Columbia Banking System, Inc. issued a press release announcing second quarter 2023 financial results.
  evidence_url: https://www.sec.gov/Archives/edgar/data/887343/000088734323000291/0000887343-23-000291-index.htm

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