Simone Lagomarsino - 02 Sep 2026 Form 4 Insider Report for COLUMBIA BANKING SYSTEM, INC. (COLB)

Reporting relationship: Director
Issuer ticker: COLB
Reported as of: 02 Sep 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 04 Sep 2026, 16:41:52 UTC
Prior SEC filing: 02 Sep 2026
Source filing: View source filing
Reporting owner signature: /s/ Kumi Yamamoto Baruffi, Attorney-in-fact

Key filing fact

Simone Lagomarsino filed Form 4 for COLUMBIA BANKING SYSTEM, INC. (COLB) on 04 Sep 2026.

Key facts

This page summarizes Simone Lagomarsino's Form 4 filing for COLUMBIA BANKING SYSTEM, INC. (COLB).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 04 Sep 2026, 16:41.

Change

Previous filing in this sequence was filed on 02 Sep 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 0001084960 Primary reporting owner

LAGOMARSINO SIMONE

Relationship: Director
Address: C/O COLUMBIA BANKING SYSTEM, INC., 1301 A STREET, TACOMA
Signature: /s/ Kumi Yamamoto Baruffi, Attorney-in-fact
Signature date: 04 Sep 2026

Reported non-derivative transactions

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

COLB transaction

Common Stock

Award

Transaction value
Shares: +2,670
Change %
Price: $0.000000^*
Shares after: 2,670
Date: 02 Sep 2026
Ownership: Direct

COLB holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 32,931
Date: 02 Sep 2026
Ownership: by family trust

COLB holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 7
Date: 02 Sep 2026
Ownership: by IRA

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

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