Columbia Banking (COLB) EVP logs share forfeiture and tax withholding

Rhea-AI Filing Summary

Columbia Banking System executive Namdar Frank reported routine equity adjustments related to prior stock awards. On January 20, 2026, 579 shares of common stock were forfeited under performance-based restricted stock units granted on February 21, 2023 because the total shareholder return target was not met at the target level.

On the same date, 1,652 shares were withheld at $28.35 per share to cover Frank’s tax obligations upon vesting of previously issued restricted stock units. After these transactions, Frank directly held 31,163 common shares and indirectly held 4,089 shares through a 401(k) plan, reflecting updated beneficial ownership rather than an open-market sale.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Namdar Frank

(Last) (First) (Middle)

C/O COLUMBIA BANKING SYSTEM, INC.

1301 A STREET

(Street)

TACOMA WA 98402

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
COLUMBIA BANKING SYSTEM, INC. [ COLB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP Chief Credit Officer

3. Date of Earliest Transaction (Month/Day/Year)
01/20/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	01/20/2026		D		579(1)	D	$0	32,815	D
Common Stock	01/20/2026		F		1,652(2)	D	$28.35	31,163	D
Common Stock								4,089	I	by 401(k)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Shares forfeited pursuant to the terms of the performance restricted stock units granted on February 21, 2023 and reported on the reporting person's Form 4 filed on February 21, 2023 (in accordance with Rule 16b-3(e)) due to the issuer's total shareholder return performance target not being met at target.

2. Represents withholding of shares of common stock to satisfy the reporting person's tax withholding obligations in connection with the vesting of previously issued restricted stock units.

Remarks:

	/s/ Andrea M. Newburn, Attorney-in-fact	01/22/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider activity did COLB executive Namdar Frank report?

Namdar Frank, EVP Chief Credit Officer of Columbia Banking System (COLB), reported a forfeiture of performance-based shares and a tax withholding transaction tied to restricted stock units.

How many COLB shares were forfeited in this Form 4?

The filing shows 579 shares of Columbia Banking common stock were forfeited under performance restricted stock units after a total shareholder return target was not met at target.

Why were some of Namdar Frank’s COLB shares withheld?

The Form 4 states that 1,652 shares of common stock were withheld at $28.35 per share to satisfy Frank’s tax withholding obligations upon vesting of previously issued restricted stock units.

How many COLB shares does Namdar Frank own after these transactions?

Following the reported transactions, Namdar Frank beneficially owned 31,163 shares directly and 4,089 shares indirectly through a 401(k) plan.

Did Namdar Frank sell COLB shares on the open market?

The reported transactions involve forfeiture of performance-based shares and share withholding for taxes, not open-market purchases or discretionary sales.

What performance condition led to the COLB share forfeiture?

The forfeited 579 shares were tied to performance restricted stock units granted on February 21, 2023, and were forfeited because the issuer’s total shareholder return performance target was not achieved at target.