COLB director receives 3,949-share stock grant

STUDENMUND JAYNIE M reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

STUDENMUND JAYNIE M reported acquisition or exercise transactions in this Form 4 filing.

Columbia Banking System director Jaynie M. Studenmund reported a compensation-related stock grant. She received 3,949 shares of Columbia Banking System common stock as a grant or award at a stated price of $0.00 per share, increasing her direct holdings to 21,807 shares. A separate line shows 3,843 shares held indirectly through an IRA, which reflects an existing position rather than a new market transaction.

Insider Trade Summary

Grant/Award: 3,949 shares

Grant/Award 2 txns

Insider STUDENMUND JAYNIE M

Role Director

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

Holdings After Transaction: Common Stock — 21,807 shares (Direct); Common Stock — 3,843 shares (Indirect, by IRA)

Key Figures

Stock grant: 3,949 shares Grant price: $0.00 per share Direct holdings after grant: 21,807 shares +1 more

4 metrics

Stock grant 3,949 shares Common Stock grant/award acquisition code A

Grant price $0.00 per share Reported transaction price for stock award

Direct holdings after grant 21,807 shares Total common stock directly owned following transaction

Indirect IRA holdings 3,843 shares Common stock held indirectly by IRA as a holding entry

Key Terms

grant/award acquisition, indirect ownership, IRA, Common Stock

4 terms

grant/award acquisition financial

"transaction_action": "grant/award acquisition"

indirect ownership financial

""direct_or_indirect": "I", "ownership_type": "indirect""

IRA financial

""nature_of_ownership": "by IRA""

An individual retirement account (IRA) is a savings account designed to help people put aside money for their retirement, often with tax advantages that encourage long-term savings. It matters to investors because it can grow over time, providing financial security later in life, and offers benefits that can reduce current taxes or allow investments to compound more effectively.

Common Stock financial

""security_title": "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.

FAQ

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

What insider transaction did COLB director Jaynie Studenmund report?

Director Jaynie M. Studenmund reported receiving a grant of 3,949 shares of Columbia Banking System common stock. This is a compensation-related award, not an open-market purchase, and increases her reported direct ownership position.

How many COLB shares does Jaynie Studenmund hold after this Form 4 filing?

After the reported grant, Jaynie Studenmund holds 21,807 shares directly of Columbia Banking System common stock. The filing also shows 3,843 shares held indirectly through an IRA, representing a separate indirect ownership position.

Was the COLB insider transaction a market purchase or a grant?

The transaction was a grant or award acquisition, not a market purchase. The Form 4 codes it as an “A” transaction, with 3,949 shares received at a reported price of $0.00 per share, indicating stock-based compensation.

Does the COLB Form 4 show any insider selling activity?

The Form 4 does not show any selling transactions. It reports one acquisition of 3,949 shares as a grant and a separate entry reflecting 3,843 shares held indirectly by an IRA, which is categorized as a holding rather than a sale.

How is indirect ownership reported for COLB director Jaynie Studenmund?

Indirect ownership is reported as 3,843 shares held “by IRA”. This line is classified as an indirect holding entry, indicating the shares are owned through an IRA account rather than directly in her own name.

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

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Accepted by SEC EDGAR 05/18/2026 - 05:16 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^*

STUDENMUND JAYNIE M

(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	21,807	D
Common Stock								3,843	I	by IRA

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)