COLUMBIA BANKING SYSTEM, INC. REPORTS FIRST QUARTER 2026 RESULTS

$192 million $209 million $0.66 $0.72 Net income Operating net income1 Earnings per common share - diluted Operating earnings per common share - diluted1 CEO Commentary "Our first quarter results reflect continued execution against the priorities we have previously outlined: delivering sustainable performance, strengthening our balance sheet, and returning excess capital to shareholders," said Clint Stein, Chair, CEO & President. "During the quarter, we increased capital returns, reflecting our confidence in earnings durability and ongoing capital generation. We also made further progress optimizing our balance sheet, as commercial loan growth and muted seasonal deposit trends contributed to the profitable remix of assets and liabilities, positioning Columbia for attractive returns over time. At the same time, our credit performance continues to benefit from disciplined underwriting and our diversified, relationship-based loan portfolio that is performing as designed. With these