BARUFFI KUMI YAMAMOTO 4

What Happened

• Kumi Baruffi Yamamoto, EVP General Counsel and Corporate Secretary of Columbia Banking System, disposed of 1,799 shares on 2026-03-01. The shares were surrendered to cover tax liability related to an equity award/option transaction at $28.45 per share, for a total value of $51,182. This was a tax-withholding disposition (not an open-market sale).

Key Details

• Transaction date: 2026-03-01
• Price per share: $28.45
• Shares disposed: 1,799; total value: $51,182
• Transaction code: F (payment of exercise price or tax liability — shares withheld to satisfy taxes)
• Shares owned after transaction: not specified in the provided details
• Filing: Form 4 filed 2026-03-02 (appears timely; not marked late)

Context

• This type of transaction commonly reflects the company withholding or receiving shares to satisfy withholding tax when options are exercised or restricted stock vests. It reduces the insider’s reported share count but is routine and does not necessarily indicate a personal decision to sell shares on the open market.