Luis Machuca - 14 Sep 2026 Form 4 Insider Report for COLUMBIA BANKING SYSTEM, INC. (COLB)

Reporting relationship: Director
Issuer ticker: COLB
Reported as of: 14 Sep 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 15 Sep 2026, 16:55:01 UTC
Prior SEC filing: 16 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Kumi Yamamoto Baruffi, Attorney-in-fact

Key filing fact

Luis Machuca filed Form 4 for COLUMBIA BANKING SYSTEM, INC. (COLB) on 15 Sep 2026.

Key facts

This page summarizes Luis Machuca's Form 4 filing for COLUMBIA BANKING SYSTEM, INC. (COLB).
1 reported transaction and 1 derivative row are listed below.
Accepted by SEC: 15 Sep 2026, 16:55.

Change

Previous filing in this sequence was filed on 16 Jun 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 0001133099 Primary reporting owner

MACHUCA LUIS

Relationship: Director
Address: C/O COLUMBIA BANKING SYSTEM, INC., 1301 A STREET, TACOMA
Signature: /s/ Kumi Yamamoto Baruffi, Attorney-in-fact
Signature date: 15 Sep 2026

Reported derivative securities

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

COLB transaction Derivative

Deferred Compensation Phantom Stock

Award

Transaction value
Shares: +594
Change %: +1.2%
Price: $30.48^*
Shares after: 49,560
Date: 14 Sep 2026
Ownership: Deferred Compensation
Underlying class: Common
Underlying amount: 594
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

The deferred compensation plan phantom stock was accrued under the Registrant's deferred compensation plan and will be settled in accordance with the terms of the deferred compensation plan following the reporting person's cessation of service as a director of the Registrant.