GARDNER STEVEN R 4

What Happened
Steven R. Gardner, a director of Columbia Banking System, Inc. (COLB), sold 13,725 shares in an open-market/private sale on January 30, 2026. The shares were sold at $29.43 each, for total proceeds of $403,927. This was a sale (not a purchase); the filing notes the sale was to satisfy mandatory liquidation requirements of the reporting person's self-directed 401(k) plan in connection with a rollover.

Key Details

• Transaction date and price: 2026-01-30 — 13,725 shares sold at $29.43 per share.
• Proceeds: $403,927 (gross).
• Shares owned after transaction: Not specified in the Form 4 filing.
• Footnote F1: Sale made to satisfy mandatory liquidation requirements of the reporting person's self-directed 401(k) plan in connection with a rollover (non-discretionary, plan-related).
• Footnote F2: The filing corrects prior reporting — 232,150 shares previously reported as directly owned are actually indirectly beneficially owned via a family trust.
• Timeliness: Form 4 was filed on Feb 3, 2026 for a Jan 30, 2026 transaction (filed within the standard two-business-day window).

Context
This transaction is a routine sale tied to a retirement-plan rollover requirement, which typically reflects plan mechanics rather than a director’s view on the stock. The correction about 232,150 shares clarifies beneficial ownership reporting but does not change the nature of this sale.