COLB executive granted 3,146 shares, withholds 1,710

Columbia Banking System executive reports stock grant and tax withholding.

Rhea-AI Filing Summary

Columbia Banking System executive reports stock grant and tax withholding. EVP Chief Admin Officer Anderson Drew K reported receiving 3,146 shares of Columbia Banking common stock on February 2, 2026 at $29.69 per share, following the vesting of performance-based restricted stock units granted in 2023.

On the same date, 1,710 shares were withheld at $29.69 per share to cover tax obligations related to this vesting. After these transactions, Anderson directly owned 23,274 shares of Columbia Banking common stock.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Anderson Drew K

Role EVP Chief Admin Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	3,146	$29.69	$93K
Exercise Price or Tax Liability	Common Stock	1,710	$29.69	$51K

Holdings After Transaction: Common Stock — 23,274 shares (Direct)

Footnotes (2)

1. F1. Shares granted pursuant to the terms of the performance restricted stock units granted on February 21, 2023, which vested on February 2, 2026 based on to the issuer's relative return on tangible common equity for fiscal years 2023-2025 compared to a Compensation Committee approved group of peers.
2. F2. Represents withholding of shares of common stock to satisfy the reporting person's tax withholding obligations in connection with the shares granted pursuant to the terms of the performance restricted stock units vesting.

FAQ

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

What insider transactions did COLB executive Anderson Drew K report?

EVP Chief Admin Officer Anderson Drew K reported two transactions on February 2, 2026: an acquisition of 3,146 Columbia Banking common shares from vested performance restricted stock units, and a disposition of 1,710 shares withheld to satisfy tax obligations tied to that vesting event.

How many COLB shares does Anderson Drew K own after this Form 4?

After the reported transactions, Anderson Drew K directly owns 23,274 shares of Columbia Banking common stock. This reflects both the 3,146-share grant from vested performance restricted stock units and the 1,710-share withholding to cover related tax liabilities on the same date.

What was the price used for the COLB Form 4 transactions?

Both the share grant and the tax withholding transactions were reported at a price of $29.69 per share. This price applied to the 3,146 shares acquired from vesting performance restricted stock units and the 1,710 shares withheld to meet the executive’s tax obligations.

What triggered the 3,146-share grant to the COLB executive?

The 3,146-share grant came from performance restricted stock units awarded on February 21, 2023, which vested on February 2, 2026. Vesting was based on Columbia Banking’s relative return on tangible common equity for fiscal years 2023–2025 versus a Compensation Committee–approved peer group.

Why were 1,710 COLB shares reported as disposed of on this Form 4?

The 1,710 shares reported as disposed were withheld to satisfy the executive’s tax withholding obligations. These shares relate directly to the stock granted upon vesting of performance restricted stock units, and represent a non-cash method of covering income tax liabilities on the award.

Is the COLB Form 4 transaction a direct or indirect ownership change?

Both reported transactions involve directly held Columbia Banking common stock, classified as direct ownership. There is no indication of trusts, partnerships, or other entities in the ownership description, so the 23,274 shares after the transactions are held directly by the reporting executive.

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

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Accepted by SEC EDGAR 02/04/2026 - 06:52 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
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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^*

Anderson Drew K

(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 Admin Officer

3. Date of Earliest Transaction (Month/Day/Year)
02/02/2026

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	02/02/2026		A		3,146(1)	A	$29.69	24,984	D
Common Stock	02/02/2026		F		1,710(2)	D	$29.69	23,274	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:

1. Shares granted pursuant to the terms of the performance restricted stock units granted on February 21, 2023, which vested on February 2, 2026 based on to the issuer's relative return on tangible common equity for fiscal years 2023-2025 compared to a Compensation Committee approved group of peers.

2. Represents withholding of shares of common stock to satisfy the reporting person's tax withholding obligations in connection with the shares granted pursuant to the terms of the performance restricted stock units vesting.

Remarks:

	/s/ Andrea M. Newburn, Attorney-in-fact	02/04/2026
	** 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).
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