Namdar Frank 4

What Happened
Frank Namdar, EVP and Chief Credit Officer of Columbia Banking System (COLB), received 4,667 shares of common stock on Feb 2, 2026 as the vesting of performance restricted stock units (PRSUs), valued at $29.69 each (total ~$138,563). Of those vested shares, 2,383 shares were withheld to cover tax obligations (at the same $29.69 price), representing a tax payment of about $70,751. The transaction code shows an award/grant (A) and a tax-withholding disposition (F).

Key Details

• Transaction date: February 2, 2026; Filing date: February 4, 2026 (filed on time).
• Award: 4,667 shares @ $29.69 each = $138,563 (code A).
• Withholding: 2,383 shares @ $29.69 each = $70,751 withheld for taxes (code F).
• Shares owned after transaction: not specified in the provided filing details.
• Footnotes: F1 — shares granted pursuant to performance RSUs granted Feb 21, 2023 that vested based on relative return on tangible common equity for FY2023–2025 vs. peers; F2 — withholding of shares to satisfy tax obligations.

Context
This was a compensation-related vesting of performance RSUs, not an open-market purchase or sale. The withholding of shares for taxes is a routine administrative step and does not by itself indicate a buy or sell decision by the insider. Performance RSU vesting reflects prior compensation terms tied to multi-year performance vs. peers.