Columbia Banking System (COLB): Director Gardner Steven R sold $328,617 worth of shares (10,522 units at $31.23) (SEC Form 4)

Historical context for COLB

Across the 30 sessions after earlier COLB headlines, the stock closed higher 13 times and lower 16 times, with a median move of 1.0% in either direction. This shows timing only: many things move a stock in a session, and these figures do not show that any headline caused a move.

Earlier insider filings at COLB

• Sep 15, 2026SEC Form 4 filed by Director Machuca Luis
• Sep 8, 2026Director Gardner Steven R was granted 2,577 shares (SEC Form 4)
• Aug 18, 2026EVP CHRO Giem Judi exercised 2,393 shares at a strike of $32.69 and covered exercise/tax liability with 643 shares (SEC Form 4)
• Jul 2, 2026EVP Chief Strategy/Innov Offcr Deer Aaron James bought $22,478 worth of shares (886 units at $25.37), increasing direct ownership by 2% to 42,761 units (SEC Form 4)
• Jun 16, 2026SEC Form 4 filed by Director Machuca Luis