Tax withholding by Columbia Banking (NASDAQ: COLB) executive

Rhea-AI Filing Summary

Senior Executive VP Christopher Merrywell of Columbia Banking System reported a tax-withholding disposition of common stock. On February 15, 2026, 1,706 shares of common stock were disposed of at $31.49 per share to cover tax obligations. After this transaction, Merrywell directly owned 44,257 common shares of the company.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Merrywell Christopher

Role Senior Executive VP

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	1,706	$31.49	$54K

Holdings After Transaction: Common Stock — 44,257 shares (Direct)

Footnotes (1)

Form 4 Insider Transactions: What Each Field Means →

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
Estimated average burden
hours per response:			0.5

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)
02/15/2026

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	02/15/2026		F		1,706	D	$31.49	44,257	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	02/18/2026
	** 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 Columbia Banking System common stock. He used company shares to satisfy tax obligations tied to equity compensation, rather than executing an open-market purchase or sale transaction.

How many COLB shares were disposed of in Merrywell’s Form 4 filing?

Merrywell disposed of 1,706 shares of Columbia Banking System common stock. The transaction was reported as a tax-withholding disposition, meaning shares were used to cover tax liabilities associated with stock-based compensation.

At what price per share was Christopher Merrywell’s COLB tax-withholding transaction reported?

The transaction was reported at $31.49 per share for Columbia Banking System common stock. This price is used to calculate the value of shares applied toward Merrywell’s tax obligations arising from equity compensation.

How many Columbia Banking (COLB) shares does Merrywell own after this transaction?

After the reported disposition, Merrywell directly owns 44,257 shares of Columbia Banking System common stock. This post-transaction holding reflects his remaining direct ownership following shares used for the tax-withholding obligation.

What does transaction code F mean in Christopher Merrywell’s COLB Form 4?

Transaction code F indicates “payment of exercise price or tax liability by delivering securities.” For Merrywell, this means Columbia Banking System shares were disposed of specifically to satisfy tax liabilities, not through a typical open-market sale.

Was Merrywell’s COLB transaction a buy or a sell in the open market?

The transaction was a tax-withholding disposition, not an open-market buy or sell. Shares were delivered to cover tax liabilities, classified as a disposal rather than an investment-driven trade on the open market.