Columbia Banking (NASDAQ: COLB) risk chief exercises RSUs, boosts holdings

Rhea-AI Filing Summary

EVP and Chief Risk Officer Andrew H. Ognall of Columbia Banking System converted 2,381 Restricted Stock Units into the same number of common shares on March 13, 2026. The common stock is shown at $26.23 per share in the filing.

To cover tax obligations, 951 common shares were withheld, leaving Ognall with a net increase of common stock while maintaining a direct holding of 74,132 shares after these transactions. He also holds 2,635 common shares indirectly through a 401(k) plan.

The RSUs come from a grant of 7,142 units awarded on February 25, 2025, scheduled to vest in three annual installments beginning March 13, 2026.

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^*

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)
03/13/2026

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	03/13/2026		M		2,381	A	$26.23	75,083	D
Common Stock	03/13/2026		F		951	D	$26.23	74,132	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
Restricted Stock Unit	(1)	03/13/2026		M			2,381	(1)	(1)	Common Stock	2,381	$0	53,026	D

Explanation of Responses:

1. Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 7,142 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026.

Remarks:

	/s/ Andrea M. Newburn, Attorney-in-fact	03/17/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transaction did COLB executive Andrew H. Ognall report?

Andrew H. Ognall exercised 2,381 Restricted Stock Units into common stock on March 13, 2026. The filing also shows a related tax withholding of 951 common shares, resulting in a net increase to his ownership position.

How many COLUMBIA BANKING SYSTEM (COLB) shares does Andrew Ognall now hold?

After the reported transactions, Andrew H. Ognall holds 74,132 COLB common shares directly. He also has an additional 2,635 common shares held indirectly through a 401(k) plan, according to the ownership table.

What was the price used for Andrew Ognall’s COLB common stock in this Form 4?

The Form 4 lists the COLB common stock at $26.23 per share for the common stock entries. This price is used for both the acquisition entry and the tax-withholding disposition reported on March 13, 2026.

Why were 951 COLB shares disposed of in Andrew Ognall’s Form 4?

The 951 common shares were disposed of under code F, meaning they were withheld to satisfy exercise price or tax liabilities. This is a tax-withholding mechanism, not an open-market sale, and is common with RSU vesting events.

What is the vesting schedule of Andrew Ognall’s COLB Restricted Stock Units?

A footnote states Ognall received 7,142 Restricted Stock Units on February 25, 2025. These RSUs vest in three annual installments, beginning on March 13, 2026, with vested units converting into common stock on a one-for-one basis.

How many COLB RSUs did Andrew Ognall exercise in this transaction?

He exercised 2,381 Restricted Stock Units, which converted into 2,381 COLB common shares on March 13, 2026. The RSUs convert on a one-for-one basis into common stock, as described in the accompanying footnote.