Frank Namdar - 18 Feb 2026 Form 4 Insider Report for COLUMBIA BANKING SYSTEM, INC. (COLB)

Reporting relationship: EVP Chief Credit Officer
Issuer ticker: COLB
Reported as of: 18 Feb 2026
Net transaction value: +$249,982
SEC form: 4
Accepted by SEC: 20 Feb 2026, 19:34:42 UTC
Prior SEC filing: 18 Feb 2026
Next SEC filing: 02 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Andrea M. Newburn, Attorney-in-fact

Key filing fact

Frank Namdar filed Form 4 for COLUMBIA BANKING SYSTEM, INC. (COLB) on 20 Feb 2026.

Key facts

This page summarizes Frank Namdar's Form 4 filing for COLUMBIA BANKING SYSTEM, INC. (COLB).
1 reported transaction and 2 derivative rows are listed below.
Accepted by SEC: 20 Feb 2026, 19:34.

Change

Previous filing in this sequence was filed on 18 Feb 2026.
Current net transaction value: +$249,982.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001759802 Primary reporting owner

Namdar Frank

Relationship: EVP Chief Credit Officer
Address: C/O COLUMBIA BANKING SYSTEM, INC., 1301 A STREET, TACOMA
Signature: /s/ Andrea M. Newburn, Attorney-in-fact
Signature date: 20 Feb 2026

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

COLB transaction Derivative

Restricted Stock Unit

Award

Transaction value: $249,982
Shares: +8,002
Change %: +95%
Price: $31.24
Shares after: 16,460
Date: 18 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 8,002
Exercise price
Footnotes: F1

COLB holding Derivative

Deferred Compensation Phantom Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 2,917
Date: 18 Feb 2026
Ownership: Deferred Compensation
Underlying class: Common
Underlying amount: 2,917
Exercise price
Footnotes: F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years.

Footnote F2

The deferred compensation plan phantom stock was accrued under the Registrant's deferred compensation plan and will be paid in cash in accordance with the terms of the deferred compensation plan following end of the reporting person's employment with the Registrant.