Kumi Yamamoto Baruffi - 18 Feb 2026 Form 4 Insider Report for COLUMBIA BANKING SYSTEM, INC. (COLB)

Role
EVP General Counsel, Corp Sec
Signature
/s/ Andrea M. Newburn, Attorney-in-fact
Issuer symbol
COLB
Transactions as of
18 Feb 2026
Net transactions value
+$259,979
Form type
4
Filing time
20 Feb 2026, 19:21:01 UTC
Previous filing
18 Feb 2026
Next filing
02 Mar 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
BARUFFI KUMI YAMAMOTO EVP General Counsel, Corp Sec C/O COLUMBIA BANKING SYSTEM, INC., 1301 A STREET, TACOMA /s/ Andrea M. Newburn, Attorney-in-fact 20 Feb 2026 0001619728

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
transaction COLB Restricted Stock Unit Award $259,979 +8,322 +117% $31.24 15,464 18 Feb 2026 Common Stock 8,322 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years.