Columbia and Pacific Premier receive all regulatory approvals; closing expected August 31, 2025

COLUMBIA BANKING SYSTEM, INC.

All required regulatory approvals received from Federal Reserve, FDIC, and Oregon DFB.
Shareholder approvals obtained July 21, 2025; merger expected to close on or about August 31, 2025.
All-stock transaction announced April 23, 2025; integration planning underway.
Clint Stein (Columbia CEO) cites strong shareholder support and expects seamless integration.

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