Deer Aaron James 4

What Happened Aaron Deer, EVP & Chief Strategy and Innovation Officer at Columbia Banking System (COLB), had 1,567 restricted stock units (RSUs) convert into common shares on March 13, 2026. The conversion is reported as 1,567 shares acquired at an imputed value of $26.23 per share (total value ~$41,102). To satisfy tax withholding obligations, 617 of those shares were withheld/disposed (value ~$16,184), leaving a net issuance of 950 shares to Deer (net value ~ $24,918).

Key Details

• Transaction date: March 13, 2026; Form 4 filed March 17, 2026 (within the required reporting window).
• Conversion price/value shown: $26.23 per share; total gross value reported ~$41,102.
• Tax withholding: 617 shares withheld (transaction code F) valued at ~$16,184.
• Net shares received: 950 shares (1,567 vested − 617 withheld) — net value ≈ $24,918.
• Footnote: The RSUs were part of a grant of 4,699 RSUs on Feb 25, 2025 that vest in three annual installments beginning March 13, 2026 (this appears to be one tranche of that grant).
• Shares owned after the transaction: not specified in the provided details.

Context This was an RSU vesting event (conversion of derivative award into common stock), not an open-market purchase or sale. The withholding of shares to cover taxes is a routine administrative step and not a market sale signal. The filing shows the derivative (RSU) was extinguished upon conversion (reported as disposed at $0), which is standard when RSUs convert into shares.