Columbia Banking System (COLB) exec withholds shares for tax

Rhea-AI Filing Summary

Columbia Banking System Senior Executive VP Christopher Merrywell reported a tax-withholding disposition of 3,230 shares of common stock at $28.45 per share. This Form 4 event reflects shares withheld to satisfy tax obligations rather than an open-market sale. After the transaction, he directly owned 41,027 common shares.

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

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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^*

Merrywell Christopher

(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)
	Senior Executive VP

3. Date of Earliest Transaction (Month/Day/Year)
03/01/2026

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	03/01/2026		F		3,230	D	$28.45	41,027	D

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:

Remarks:

	/s/ Andrea M. Newburn, Attorney-in-fact	03/02/2026
	** 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 transaction did COLB executive Christopher Merrywell report?

Christopher Merrywell reported a tax-withholding disposition of 3,230 COLB common shares. The shares were withheld at $28.45 per share to cover tax liabilities, and the transaction was coded as a tax-withholding event rather than an open-market sale.

Did the COLB executive buy or sell shares in this Form 4 filing?

The COLB executive did not report a traditional open-market buy or sell. Instead, he reported a tax-withholding disposition, where 3,230 shares of common stock were withheld at $28.45 per share to satisfy tax obligations associated with equity compensation.

How many COLUMBIA BANKING SYSTEM (COLB) shares were involved in the tax withholding?

The tax-withholding transaction involved 3,230 COLB common shares. These shares were disposed of at $28.45 per share to pay tax liabilities tied to equity awards, as reflected in the Form 4 insider transaction report.

How many COLB shares does Christopher Merrywell own after this transaction?

After the tax-withholding disposition, Christopher Merrywell directly owned 41,027 COLB common shares. This post-transaction holding reflects his remaining stake following the 3,230-share tax-withholding event disclosed in the Form 4 filing.

What does transaction code F mean in the COLB Form 4 filing?

Transaction code F indicates a tax-withholding disposition of shares. In this COLB filing, it shows that 3,230 common shares were delivered at $28.45 per share to cover exercise price or tax liabilities linked to equity compensation.