Ivan A. Seda - 31 Dec 2025 Form 3 Insider Report for COLUMBIA BANKING SYSTEM, INC. (COLB)

Role
EVP, Chief Financial Officer
Signature
/s/ Andrea M. Newburn, Attorney-in-fact
Issuer symbol
COLB
Transactions as of
31 Dec 2025
Net transactions value
$0
Form type
3
Filing time
31 Dec 2025, 17:59:08 UTC
Next filing
20 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Seda Ivan A EVP, Chief Financial Officer C/O COLUMBIA BANKING SYSTEM, INC., 1301 A STREET, TACOMA /s/ Andrea M. Newburn, Attorney-in-fact 31 Dec 2025 0002099171

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
holding COLB Performance Restricted Stock Unit 31 Dec 2025 Common Stock 28,464 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 28,464 performance-based restricted stock units granted 10/29/2025. The grant will vest approximately three years following the grant date based on the issuer's relative total shareholder return performance and return on tangible common equity for fiscal years 2025-2027 compared to a group of peer companies approved by the issuer's compensation committee.