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

COLUMBIA BANKING SYSTEM, INC.

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.

item 5.02 item 7.01 item 9.01

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Appointed

Simone Lagomarsino

Director

COLB · COLUMBIA BANKING SYSTEM, INC.

Effective: 2026-09-01
Filed: July 30, 2026, 5:27 PM ET

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”).

Key facts

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Executive change SEC 8-K Item 5.02 confidence 0.95

Simone Lagomarsino was appointed as Director at COLUMBIA BANKING SYSTEM, INC..

Action: appointed
Role: Director

Exact text from the filing

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”).

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Source: SEC EDGAR

accession 0000887343-26-000167

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