COLB EVP logs stock forfeiture, tax withholding

Columbia Banking System EVP Drew K. Anderson reported two stock transactions involving company common shares.

Rhea-AI Filing Summary

Columbia Banking System EVP Drew K. Anderson reported two stock transactions involving company common shares. On January 20, 2026, 390 shares were forfeited at $0 pursuant to performance-based restricted stock units granted on February 21, 2023, after the company’s total shareholder return target was not met at target. On the same date, 1,114 shares were withheld at $28.35 per share to cover tax obligations tied to the vesting of previously issued restricted stock units. After these transactions, Anderson directly owned 21,838 shares of Columbia Banking System 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
Disposition	Common Stock	390	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	1,114	$28.35	$32K

Holdings After Transaction: Common Stock — 21,838 shares (Direct)

Footnotes (2)

1. F1. Shares forfeited pursuant to the terms of the performance restricted stock units granted on February 21, 2023 and reported on the reporting person's Form 4 filed on February 21, 2023 (in accordance with Rule 16b-3(e)) due to the issuer's total shareholder return performance target not being met at target.
2. F2. Represents withholding of shares of common stock to satisfy the reporting person's tax withholding obligations in connection with the vesting of previously issued restricted stock units.

FAQ

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

What insider activity did COLB executive Drew K. Anderson report?

EVP Chief Admin Officer Drew K. Anderson reported the forfeiture of 390 shares and the withholding of 1,114 Columbia Banking System common shares on January 20, 2026.

Why were 390 COLB shares forfeited by the EVP?

The 390 forfeited shares reflect performance restricted stock units granted on February 21, 2023, that did not vest because the issuer’s total shareholder return performance target was not met at target.

Why were 1,114 COLB shares withheld from Drew K. Anderson?

The 1,114 shares were withheld to cover tax withholding obligations arising from the vesting of previously issued restricted stock units.

How many COLB shares does the EVP own after these transactions?

Following the reported transactions, Drew K. Anderson directly owned 21,838 shares of Columbia Banking System common stock.

Are these COLB insider transactions open-market sales?

No. The Form 4 indicates a forfeiture of performance-based units and a tax withholding related to vesting, rather than discretionary open-market share sales.

What role does Drew K. Anderson hold at Columbia Banking System (COLB)?

Drew K. Anderson is reported as an officer of Columbia Banking System with the title EVP Chief Admin Officer.

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

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Accepted by SEC EDGAR 01/22/2026 - 06:09 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^*

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)
01/20/2026

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	01/20/2026		D		390(1)	D	$0	22,952	D
Common Stock	01/20/2026		F		1,114(2)	D	$28.35	21,838	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 forfeited pursuant to the terms of the performance restricted stock units granted on February 21, 2023 and reported on the reporting person's Form 4 filed on February 21, 2023 (in accordance with Rule 16b-3(e)) due to the issuer's total shareholder return performance target not being met at target.

2. Represents withholding of shares of common stock to satisfy the reporting person's tax withholding obligations in connection with the vesting of previously issued restricted stock units.

Remarks:

	/s/ Andrea M. Newburn, Attorney-in-fact	01/22/2026
	** 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.