Columbia Banking EVP reports tax-share disposition

COLUMBIA BANKING SYSTEM, INC. executive Andrew H. Ognall reported a tax-related share disposition on Common Stock.

Rhea-AI Filing Summary

COLUMBIA BANKING SYSTEM, INC. executive Andrew H. Ognall reported a tax-related share disposition on Common Stock. An automatic tax-withholding transaction disposed of 1,304 shares at $28.45 per share, leaving 72,702 shares held directly and 2,635 shares held indirectly through a 401(k) plan.

Insider Trade Summary

Exercise Price or Tax Liability: 1,304 shares

Exercise Price or Tax Liability 2 txns

Insider OGNALL ANDREW H

Role EVP Chief Risk Officer

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	1,304	$28.45	$37K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 72,702 shares (Direct); Common Stock — 2,635 shares (Indirect, by 401(k))

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did COLB executive Andrew H. Ognall report on this Form 4?

Andrew H. Ognall reported a tax-related disposition of Columbia Banking System common stock. A tax-withholding transaction disposed of 1,304 shares, recorded at $28.45 per share, as part of satisfying an exercise price or tax liability using previously owned shares.

How many COLB shares did Andrew H. Ognall dispose of and at what price?

The filing shows a disposition of 1,304 shares of Columbia Banking System common stock. These shares were valued at $28.45 per share and were used to pay an exercise price or tax liability, rather than being sold in a traditional open-market transaction.

What does transaction code F mean in Andrew H. Ognalls COLB Form 4 filing?

Transaction code F indicates payment of an exercise price or tax liability by delivering securities. In this case, 1,304 Columbia Banking System common shares were used to cover a tax obligation, categorized as a tax-withholding disposition instead of a standard market sale.

How many COLB shares does Andrew H. Ognall hold after the reported transactions?

After the reported activity, Andrew H. Ognall directly holds 72,702 Columbia Banking System common shares. He also has an indirect position of 2,635 shares held through a 401(k) plan, reflecting both personal and retirement-related ownership reported in the Form 4.

How are Andrew H. Ognalls indirect COLB holdings structured in this Form 4?

The Form 4 lists 2,635 Columbia Banking System common shares as indirectly owned. These indirect holdings are identified with a nature of ownership by 401(k), indicating they are held within a 401(k) retirement plan rather than in a standard brokerage account.

Does this COLB Form 4 show any open-market buying or selling by Andrew H. Ognall?

The filing does not show open-market buying or selling. The only characterized transaction is a tax-withholding disposition under code F, where 1,304 Columbia Banking System shares were delivered to satisfy an exercise price or tax liability, rather than sold on the market.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/02/2026 - 09:06 PM Learn about SEC filing dates

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^*

OGNALL ANDREW H

(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 Risk Officer

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		1,304	D	$28.45	72,702	D
Common Stock								2,635	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:

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.