Columbia Bank SEC Filings

Columbia Banking System (COLB) announced a quarterly cash dividend of $0.37 per common share, representing a 3% increase from its most recent dividend. The dividend is payable December 15, 2025 to shareholders of record as of November 28, 2025.

The update, disclosed under an Other Events report, reflects the company’s ongoing cash returns to shareholders through regular dividends. A related press release was filed as Exhibit 99.1.

Columbia Banking System (COLB) director reported a Form 4 transaction involving deferred compensation. On 11/05/2025, the reporting person acquired 630 deferred compensation phantom stock units (Transaction Code: A) at a derivative price of $26.55 per unit. Following this accrual, the reporting person beneficially owns 47,117 derivative securities, held indirectly through the company’s deferred compensation plan. Per the plan, these units are payable after the individual’s employment ends.

Columbia Banking System (COLB) appointed Ivan Seda as Chief Financial Officer of the company and Columbia Bank effective December 31, 2025. Beginning November 1, 2025, his compensation terms include an annual base salary of $550,000, a target annual incentive of 85% of base salary, and performance stock units valued at $750,000 that will cliff vest after three years based on performance conditions.

Ronald L. Farnsworth will transition from CFO to senior advisor from the effective date through June 1, 2026. Under a transition letter, he will receive salary at his current annual rate, continue health and welfare benefits eligibility, and vest outstanding equity per award terms, but will not receive a 2026 incentive or new equity. Upon his termination on June 1, 2026 (subject to conditions), he is entitled to severance per his participation agreement, a lump sum equal to the company’s monthly benefits contribution multiplied by 18, and a lump sum equal to 62,572 multiplied by the closing price of COLB common stock on the separation date.

Columbia Banking System (COLB) reported that it issued a press release announcing its third quarter 2025 financial results. The company also released an investor slide presentation to be discussed on its earnings conference call on October 30, 2025.

The press release is furnished as Exhibit 99.1 and the presentation as Exhibit 99.2; these materials are not deemed filed under the Exchange Act. Final financial statements for the quarter ended September 30, 2025 will be included in the upcoming Form 10‑Q.

Columbia Banking System insider acquisition tied to Pacific Premier merger The reporting person, a company director, received 245,875 shares of Columbia common stock directly and 338,221 shares indirectly through the Gardner Family Trust as part of Columbia's acquisition of Pacific Premier Bancorp. Under the merger terms each Pacific Premier share was converted into 0.9150 Columbia shares, with fractional shares paid in cash. The filing discloses the share conversion and the closing prices on August 29: Columbia at $26.77 and Pacific Premier at $24.49.

Jaynie M. Studenmund, a director of Columbia Banking System, Inc. (COLB), reported acquisition of Columbia common stock related to Columbia's acquisition of Pacific Premier Bancorp, Inc. Pursuant to the merger, each Pacific Premier share held by the reporting person converted into the right to receive 0.9150 shares of Columbia common stock, with fractional shares paid in cash. The reporter acquired 15,653 shares directly and 3,843 shares indirectly (via a Morgan Stanley IRA) on 08/31/2025, and an additional 2,205 restricted shares were acquired on 09/02/2025 that vest in full on 05/15/2026. The form notes closing prices on 08/29/2025: Columbia $26.77 and Pacific Premier $24.49.

Mitchell M. Christian, a director of Columbia Banking System, Inc. (COLB), reported acquisitions totaling 37,960 shares of Columbia common stock. On 08/31/2025 he received 35,755 shares as part of Columbia's acquisition of Pacific Premier Bancorp, Inc., where each Pacific Premier share converted into 0.9150 Columbia shares; fractional shares were paid in cash. The filing shows closing prices on 08/29/2025 of Columbia at $26.77 and Pacific Premier at $24.49. Separately, on 09/02/2025 he was granted 2,205 restricted shares that vest on 05/15/2026. All reported holdings are direct beneficial ownership and the transactions are coded as acquisitions with a reported price of $0, reflecting conversion/award mechanics.

Columbia Banking System, Inc. (COLB) filed an Initial Statement on Form 3 for reporting person Jaynie M. Studenmund, indicating her relationship to the issuer as a Director. The filing states no securities are beneficially owned by the reporting person. The form was executed by an attorney-in-fact on 09/03/2025 and records the triggering event date as 08/31/2025.