Brock Lakely - 20 Nov 2025 Form 3 Insider Report for COLUMBIA BANKING SYSTEM, INC. (COLB)

Role
EVP, Chief Accounting Officer
Signature
/s/ Andrea M. Newburn, Attorney-in-fact
Issuer symbol
COLB
Transactions as of
20 Nov 2025
Net transactions value
$0
Form type
3
Filing time
01 Dec 2025, 20:03:41 UTC
Previous filing
01 Mar 2023
Next filing
20 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Lakely Brock EVP, Chief Accounting Officer C/O COLUMBIA BANKING SYSTEM, INC., 1301 A STREET, TACOMA /s/ Andrea M. Newburn, Attorney-in-fact 01 Dec 2025 0001740374

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
holding COLB Common Stock 10,860 20 Nov 2025 Direct

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 Restricted Stock Unit 20 Nov 2025 Common Stock 5,055 Direct F1, F2
holding COLB Performance Restricted Stock Unit 20 Nov 2025 Common Stock 6,312 Direct F3, F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 2,537 restricted stock units granted 02/25/2025. The grant will vest 33.33% per year over three years.
F2 2,518 restricted stock units granted 03/01/2024. The grant will vest 33.33% per year over two years.
F3 2,536 performance-based restricted stock units granted 02/25/2025. The grant will vest approximately three years following the grant date based on the issuer's relative total shareholder return 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.
F4 3,776 performance-based restricted stock units granted 03/01/2024. 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 2024-2026 compared to a group of peer companies approved by the issuer's compensation committee.