Columbia Banking (COLB) director awarded 3,949 common shares

Rhea-AI Filing Summary

Columbia Banking System, Inc. director Mark A. Finkelstein reported an equity grant of company common stock. He acquired 3,949 shares of Common Stock on May 14, 2026 in a transaction coded as a grant, award, or other acquisition at a stated price of $0.00 per share. Following this award, his directly held position increased to 35,554 common shares.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Finkelstein Mark A

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	3,949	$0.00	--

Holdings After Transaction: Common Stock — 35,554 shares (Direct, null)

Footnotes (1)

Key Figures

Shares granted: 3,949 shares Grant price per share: $0.00 per share Shares held after transaction: 35,554 shares

3 metrics

Shares granted 3,949 shares Common Stock grant on May 14, 2026

Grant price per share $0.00 per share Recorded transaction price for awarded shares

Shares held after transaction 35,554 shares Direct ownership following the grant

Key Terms

Grant, award, or other acquisition, Common Stock, Form 4

3 terms

Grant, award, or other acquisition financial

"Transaction code description is "Grant, award, or other acquisition" for the shares."

Common Stock financial

"The security title for the reported transaction is listed as Common Stock."

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 regulatory

"The insider transaction is disclosed in a Form 4 insider filing."

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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^*

Finkelstein Mark A

(Last) (First) (Middle)

C/O COLUMBIA BANKING SYSTEM, INC.

1301 A STREET

(Street)

TACOMA WASHINGTON 98402

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
COLUMBIA BANKING SYSTEM, INC. [ COLB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/14/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	05/14/2026		A		3,949	A	$0	35,554	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	05/18/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did COLB director Mark A. Finkelstein report?

Director Mark A. Finkelstein reported acquiring 3,949 shares of Columbia Banking System common stock. The transaction is coded as a grant, award, or other acquisition, indicating the shares were awarded rather than bought in the open market.

How many Columbia Banking System (COLB) shares did the director receive?

Mark A. Finkelstein received 3,949 shares of Columbia Banking System common stock. This award increased his directly held position, providing him with additional equity exposure to the company’s performance through its common shares.

At what price were the new COLB shares granted to the director?

The 3,949 Columbia Banking System shares were recorded at a transaction price of $0.00 per share. This aligns with the filing’s description of the event as a grant, award, or other acquisition rather than a market purchase.

What are Mark A. Finkelstein’s COLB holdings after this Form 4 transaction?

After the reported transaction, Mark A. Finkelstein directly holds 35,554 shares of Columbia Banking System common stock. This figure reflects his ownership immediately following the 3,949-share grant, award, or other acquisition disclosed in the Form 4.

Was the COLB director’s transaction a market buy or a share grant?

The transaction was a share grant, not a market buy. It is coded as a grant, award, or other acquisition with a $0.00 per-share price, indicating the shares were awarded rather than purchased on the open market.