---
schema_version: "secwatch.filing_event.v1"
accession: "0000887343-26-000167"
form_type: "8-K"
ticker: "COLB"
cik: "0000887343"
company_name: "COLUMBIA BANKING SYSTEM, INC."
filed_at: "2026-07-30T21:27:01+00:00"
generated_at: "2026-07-30T21:28:05.162775+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.35
calibrated_materiality_score: 0.35
confidence: "high"
source: SEC EDGAR
---

# Columbia Banking System appoints Simone Lagomarsino to board, effective Sept 1, 2026

## Summary
- Lagomarsino will serve on Audit and Enterprise Risk Management Committees.
- She receives annual cash retainer of $95,000 and equity retainer of $115,000, prorated for 2026.
- She previously served as President of First Foundation Inc. until its sale in April 2026.
- Lagomarsino also receives $100,000 annual deferred compensation payments from Heritage Oaks Bank through 2032.
- Appointment subject to Oregon regulator approval for Columbia Bank board seat.

## SEC filing metadata
- accession: 0000887343-26-000167
- form_type: 8-K
- ticker: COLB
- cik: 0000887343
- company_name: COLUMBIA BANKING SYSTEM, INC.
- filed_at: 2026-07-30T21:27:01+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.35
- calibrated_materiality_score: 0.35
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/887343/000088734326000167/0000887343-26-000167-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/887343/000088734326000167/colb-20260728.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000887343-26-000167
- JSON: https://secwatch.observer/filing/0000887343-26-000167.json
- Plain text: https://secwatch.observer/filing/0000887343-26-000167.txt

## Key facts
- Executive change
  Simone Lagomarsino was appointed as Director at COLUMBIA BANKING SYSTEM, INC..
  - Action: appointed
  - Role: Director
  source text: On July 28, 2026, the Board of Directors of Columbia Banking System, Inc. (the “Company”) appointed Simone Lagomarsino to the Board of Directors of the Company and, subject to approval by the Oregon Department of Consumer and Financial Services Division of Financial Regulation, the Board of Directors of Columbia Bank, the Company’s wholly owned subsidiary, effective as of September 1, 2026 (the “Effective Date”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/887343/000088734326000167/0000887343-26-000167-index.htm

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