Clint Stein - 13 Mar 2026 Form 4 Insider Report for COLUMBIA BANKING SYSTEM, INC. (COLB)

Reporting relationship: Chair, CEO, President, Director
Issuer ticker: COLB
Reported as of: 13 Mar 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 17 Mar 2026, 20:48:47 UTC
Prior SEC filing: 02 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Andrea M. Newburn, Attorney-in-fact

Key filing fact

Clint Stein filed Form 4 for COLUMBIA BANKING SYSTEM, INC. (COLB) on 17 Mar 2026.

Key facts

This page summarizes Clint Stein's Form 4 filing for COLUMBIA BANKING SYSTEM, INC. (COLB).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 17 Mar 2026, 20:48.

Change

Previous filing in this sequence was filed on 02 Mar 2026.
Current net transaction value: $0.

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 0001550429 Primary reporting owner

Stein Clint

Relationship: Chair, CEO, President, Director
Address: C/O COLUMBIA BANKING SYSTEM, INC., 1301 A STREET, TACOMA
Signature: /s/ Andrea M. Newburn, Attorney-in-fact
Signature date: 17 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

COLB transaction

Common Stock

Options Exercise

Transaction value
Shares: +18,171
Change %: +13%
Price: $26.23^*
Shares after: 158,735
Date: 13 Mar 2026
Ownership: Direct

COLB transaction

Common Stock

Tax liability

Transaction value
Shares: -7,151
Change %: -4.5%
Price: $26.23^*
Shares after: 151,584
Date: 13 Mar 2026
Ownership: Direct

Reported derivative securities

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

COLB transaction Derivative

Restricted Stock Unit

Options Exercise

Transaction value
Shares: -18,171
Change %: -9.8%
Price: $0.000000^*
Shares after: 166,984
Date: 13 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 18,171
Exercise price
Footnotes: F1

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 54,511 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026.