Steven R. Gardner - 30 Jan 2026 Form 4 Insider Report for COLUMBIA BANKING SYSTEM, INC. (COLB)

Reporting relationship: Director
Issuer ticker: COLB
Reported as of: 30 Jan 2026
Net transaction value: -$403,927
SEC form: 4
Accepted by SEC: 03 Feb 2026, 17:13:20 UTC
Prior SEC filing: 03 Sep 2025
Source filing: View source filing
Reporting owner signature: /s/ Andrea M. Newburn, Attorney-in-fact

Key filing fact

Steven R. Gardner filed Form 4 for COLUMBIA BANKING SYSTEM, INC. (COLB) on 03 Feb 2026.

Key facts

This page summarizes Steven R. Gardner's Form 4 filing for COLUMBIA BANKING SYSTEM, INC. (COLB).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 03 Feb 2026, 17:13.

Change

Previous filing in this sequence was filed on 03 Sep 2025.
Current net transaction value: -$403,927.

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 0001267342 Primary reporting owner

GARDNER STEVEN R

Relationship: Director
Address: C/O COLUMBIA BANKING SYSTEM, INC., 1301 A STREET, TACOMA
Signature: /s/ Andrea M. Newburn, Attorney-in-fact
Signature date: 03 Feb 2026

Reported non-derivative transactions

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

COLB transaction

Common Stock

Sale

Transaction value: $403,927
Shares: -13,725
Change %: -100%
Price: $29.43
Shares after: 0
Date: 30 Jan 2026
Ownership: by 401(k)
Footnotes: F1

COLB holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 570,370
Date: 30 Jan 2026
Ownership: by family trust
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

Shares sold to satisfy mandatory liquidation requirements of the reporting person's self-directed 401(k) plan in connection with a rollover.

Footnote F2

232,150 shares of the Issuer's common stock were previously inadvertently reported as directly owned by the reporting person and are indirectly beneficially owned by the reporting person via family trust.