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

Role
Director
Signature
/s/ Lisa M. White, Attorney-in-fact
Stock symbol
COLB
Transactions as of
Aug 31, 2025
Transactions value $
$0
Form type
4
Date filed
9/3/2025, 09:41 PM
Previous filing
May 6, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
STUDENMUND JAYNIE M Director C/O COLUMBIA BANKING SYSTEM, INC., 1301 A STREET, TACOMA /s/ Lisa M. White, Attorney-in-fact 2025-09-03 0001222385

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction COLB Common Stock Award $0 +15.7K $0.00 15.7K Aug 31, 2025 Direct F1
transaction COLB Common Stock Award $0 +3.84K $0.00 3.84K Aug 31, 2025 By Morgan Stanley IRA F1
transaction COLB Common Stock Award $0 +2.21K +14.09% $0.00 17.9K Sep 2, 2025 Direct F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
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.
F2 Restricted stock awards that vest in their entirety on May 15, 2026.