Columbia Banking (NASDAQ: COLB) CMO uses 838 shares for taxes

Rhea-AI Filing Summary

Columbia Banking System executive reports tax-related share transfer. EVP and Chief Marketing Officer David Moore Devine disposed of 838 shares of common stock on March 1, 2026 in a transaction coded “F,” which represents a tax-withholding disposition rather than an open-market sale. The shares were valued at $28.45 per share. After this transaction, he directly owned 21,944 common shares.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Moore Devine David

Role EVP Chief Marketing Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	838	$28.45	$24K

Holdings After Transaction: Common Stock — 21,944 shares (Direct)

Footnotes (1)

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^*

Moore Devine David

(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 Marketing 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		838	D	$28.45	21,944	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:

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.

FAQ

What insider transaction did COLB executive David Moore Devine report?

EVP and Chief Marketing Officer David Moore Devine reported a tax-related transfer of 838 shares of Columbia Banking System common stock. The Form 4 shows this as a tax-withholding disposition, not an open-market trade, related to paying exercise price or tax liability.

How many COLB shares were involved in the March 1, 2026 Form 4?

The Form 4 reports 838 shares of Columbia Banking System common stock disposed of on March 1, 2026. The transaction is coded “F,” indicating shares were delivered to satisfy an exercise price or tax obligation rather than being sold on the open market.

At what price were the 838 COLB shares valued in the insider transaction?

The 838 Columbia Banking System common shares were valued at $28.45 per share in the reported transaction. This price is used to calculate the value of shares delivered to cover the executive’s exercise price or tax liability, according to the Form 4 details.

How many COLB shares does David Moore Devine own after this transaction?

After the tax-withholding disposition, David Moore Devine directly owns 21,944 Columbia Banking System common shares. This post-transaction holding figure is reported in the Form 4 and reflects his remaining direct ownership following the 838-share transfer for tax purposes.

What does transaction code “F” mean in the COLB insider filing?

Transaction code “F” in the Columbia Banking System Form 4 signifies payment of an exercise price or tax liability by delivering securities. It indicates a tax-withholding disposition, distinguishing this event from a typical open-market purchase or sale of common stock by the insider.

Was the COLB insider transaction a market sale of shares?

The reported COLB insider transaction was not a standard market sale. It is coded “F,” describing a tax-withholding disposition where shares are delivered to cover exercise price or tax obligations, rather than shares being sold directly into the open market for cash proceeds.