Jaynie M. Studenmund - 31 Aug 2025 Form 4 Insider Report for COLUMBIA BANKING SYSTEM, INC. (COLB)

Reporting relationship: Director
Issuer ticker: COLB
Reported as of: 31 Aug 2025
Net transaction value: $0
SEC form: 4
Accepted by SEC: 03 Sep 2025, 21:41:31 UTC
Prior SEC filing: 06 May 2025
Next SEC filing: 18 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Lisa M. White, Attorney-in-fact

Key filing fact

Jaynie M. Studenmund filed Form 4 for COLUMBIA BANKING SYSTEM, INC. (COLB) on 03 Sep 2025.

Key facts

This page summarizes Jaynie M. Studenmund's Form 4 filing for COLUMBIA BANKING SYSTEM, INC. (COLB).
3 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 03 Sep 2025, 21:41.

Change

Previous filing in this sequence was filed on 06 May 2025.
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 0001222385 Primary reporting owner

STUDENMUND JAYNIE M

Relationship: Director
Address: C/O COLUMBIA BANKING SYSTEM, INC., 1301 A STREET, TACOMA
Signature: /s/ Lisa M. White, Attorney-in-fact
Signature date: 03 Sep 2025

Reported non-derivative transactions

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

COLB transaction

Common Stock

Award

Transaction value: $0
Shares: +15,653
Change %
Price: $0.000000
Shares after: 15,653
Date: 31 Aug 2025
Ownership: Direct
Footnotes: F1

COLB transaction

Common Stock

Award

Transaction value: $0
Shares: +3,843
Change %
Price: $0.000000
Shares after: 3,843
Date: 31 Aug 2025
Ownership: By Morgan Stanley IRA
Footnotes: F1

COLB transaction

Common Stock

Award

Transaction value: $0
Shares: +2,205
Change %: +14%
Price: $0.000000
Shares after: 17,858
Date: 02 Sep 2025
Ownership: Direct
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

Acquired in connection with Columbia Banking System, Inc.'s ("Columbia") acquisition of Pacific Premier Bancorp, Inc. ("Pacific Premier") on August 31, 2025. Pursuant to the merger agreement, each issued and outstanding share of Pacific Premier common stock held by the reporting person was converted into the right to receive 0.9150 of a share of Columbia common stock. All fractional share holdings were paid in cash. On August 29, 2025, the closing price of Columbia common stock was $26.77, and the closing price of Pacific Premier common stock was $24.49.

Footnote F2

Restricted stock awards that vest in their entirety on May 15, 2026.