Columbia Banking (COLB) EVP gets 2,620 shares; 1,191 withheld

Rhea-AI Filing Summary

Columbia Banking, Inc. reported an insider equity transaction by EVP Chief Strategy/Innovation Officer Aaron James Deer. On February 2, 2026, he acquired 2,620 shares of common stock at $29.69 per share from performance restricted stock units granted on February 21, 2023.

The units vested based on the company’s relative return on tangible common equity for fiscal years 2023–2025 versus a Compensation Committee–approved peer group. On the same date, 1,191 shares were withheld to cover tax obligations, leaving Deer with 42,374 common shares held directly.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Deer Aaron James

Role EVP Chief Strategy/Innov Offcr

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	2,620	$29.69	$78K
Tax Withholding	Common Stock	1,191	$29.69	$35K

Holdings After Transaction: Common Stock — 43,565 shares (Direct)

Footnotes (1)

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. 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.

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^*

Deer Aaron James

(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 Strategy/Innov Offcr

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		2,620(1)	A	$29.69	43,565	D
Common Stock	02/02/2026		F		1,191(2)	D	$29.69	42,374	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).
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 Columbia Banking (COLB) report in this Form 4?

Columbia Banking reported that EVP Chief Strategy/Innovation Officer Aaron James Deer acquired 2,620 shares of common stock on February 2, 2026. The shares came from performance restricted stock units that vested based on relative return on tangible common equity for fiscal years 2023–2025.

How many Columbia Banking (COLB) shares did the EVP receive and at what price?

Aaron James Deer received 2,620 Columbia Banking common shares at a reported price of $29.69 per share. These shares were issued upon vesting of performance restricted stock units originally granted on February 21, 2023 under the company’s incentive program.

Why were 1,191 Columbia Banking (COLB) shares disposed of in this filing?

The 1,191 Columbia Banking shares reported as disposed represent stock withheld to satisfy Aaron James Deer’s tax withholding obligations. This withholding is tied to the shares received when his performance restricted stock units vested on February 2, 2026.

How many Columbia Banking (COLB) shares does Aaron James Deer own after this transaction?

After the reported award and tax withholding, Aaron James Deer beneficially owns 42,374 Columbia Banking common shares directly. This figure reflects the net position following the 2,620-share acquisition and 1,191-share withholding on February 2, 2026.

What performance period determined the vesting of Columbia Banking (COLB) performance restricted stock units?

The performance restricted stock units vested based on Columbia Banking’s relative return on tangible common equity for fiscal years 2023–2025. Results were measured against a peer group approved by the Compensation Committee, which governed how many shares were ultimately delivered.

Who is the insider involved in this Columbia Banking (COLB) Form 4 filing?

The insider is Aaron James Deer, who serves as Executive Vice President and Chief Strategy/Innovation Officer at Columbia Banking. He is an officer but not a director or 10% owner, and the reported holdings are listed as directly owned common stock.