BARUFFI KUMI YAMAMOTO 4

What Happened
Kumi Yamamoto, EVP, General Counsel and Corporate Secretary of Columbia Banking System, had 1,036 shares disposed/withheld to cover tax or exercise-related liabilities (transaction code F). The shares were valued at $31.49 each, for a total of roughly $32,624. This was a withholding to satisfy tax obligations—not an open-market sale driven by a decision to liquidate holdings.

Key Details

• Transaction date: 2026-02-15
• Filing date: 2026-02-18 (filed three days after the transaction; appears late under the Form 4 two-business-day rule)
• Shares involved: 1,036 shares withheld/disposed
• Price per share: $31.49
• Total value: ~$32,624
• Shares owned after transaction: Not disclosed in this filing excerpt
• Transaction code: F — payment of exercise price or tax liability (share withholding)

Context
Code F typically indicates shares were withheld to cover taxes from an option exercise or vesting event (a routine, administrative action). This type of transaction usually does not signal a change in the insider’s investment view; purchases are generally more indicative of a bullish signal.