[Form 4] COLUMBIA BANKING SYSTEM, INC. Insider Trading Activity

MACHUCA LUIS reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

MACHUCA LUIS reported acquisition or exercise transactions in this Form 4 filing.

Columbia Banking System director Luis Machuca received a grant of 3,949 shares of Common Stock on May 14, 2026. The shares were awarded at a price of $0.00 per share, indicating a compensation-related grant rather than a market purchase. Following this award, Machuca directly holds 29,953 shares of Columbia Banking System common stock.

Insights

Equity compensation analyst

Director received a routine stock grant that increased his direct holdings.

Director Luis Machuca acquired 3,949 shares of Columbia Banking System common stock via a grant coded "A" for grant, award, or other acquisition. The shares were issued at $0.00 per share, confirming this is equity compensation rather than an open-market transaction.

After the grant, Machuca directly holds 29,953 common shares. With no derivative positions reported and no sales activity, this filing reflects additional alignment through stock-based compensation. There is no indication of a trading plan or discretionary buying or selling in this disclosure.

Insider Trade Summary

Grant/Award: 3,949 shares

Grant/Award 1 txn

Insider MACHUCA LUIS

Role Director

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

Holdings After Transaction: Common Stock — 29,953 shares (Direct)

Key Figures

Shares granted: 3,949 shares Grant price: $0.00 per share Shares held after grant: 29,953 shares

3 metrics

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

Grant price $0.00 per share Equity compensation, not market purchase

Shares held after grant 29,953 shares Total direct holdings after transaction

Key Terms

Common Stock, Grant, award, or other acquisition, equity compensation

3 terms

Common Stock financial

"Luis Machuca received a grant of 3,949 shares of 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.

Grant, award, or other acquisition financial

"transaction code "A" for Grant, award, or other acquisition"

equity compensation financial

"indicating a compensation-related grant rather than a market purchase, reflecting equity compensation"

Equity compensation is pay given to employees, executives or contractors in the form of company ownership—such as stock, stock options or restricted shares—rather than just cash. It matters to investors because it can align workers' incentives with shareholders (like paying someone in slices of the same pie they help grow), but it also increases the number of shares outstanding and company expenses, affecting ownership percentages and earnings per share.

FAQ

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

What did Luis Machuca do in this Form 4 for COLB?

Luis Machuca reported receiving a grant of 3,949 shares of Columbia Banking System common stock. The shares were awarded at no cash cost, reflecting equity compensation rather than an open-market purchase or sale.

How many COLB shares did Luis Machuca acquire in the latest filing?

Luis Machuca acquired 3,949 Columbia Banking System common shares through a grant. This award was reported with a transaction code "A", meaning a grant, award, or other acquisition, and carried a price of $0.00 per share.

What is Luis Machuca’s total COLB shareholding after this grant?

After the reported grant, Luis Machuca directly holds 29,953 shares of Columbia Banking System common stock. This total reflects his position following the 3,949-share award disclosed in the Form 4 insider transaction report.

Was the COLB Form 4 transaction a market buy or sell?

The COLB Form 4 shows a compensation grant, not a market trade. The transaction code "A" and the $0.00 per-share price indicate a grant or award of 3,949 shares rather than an open-market purchase or sale.

Does the COLB Form 4 show any stock options or derivatives for Luis Machuca?

The Form 4 data show no derivative securities for Luis Machuca. The filing only reports a non-derivative grant of 3,949 shares of Columbia Banking System common stock and lists no remaining derivative positions.

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

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Accepted by SEC EDGAR 05/18/2026 - 05:10 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^*

MACHUCA LUIS

(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	29,953	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)