What is Seaton’s direct share ownership in COLB after this Form 4?

After the reported grant, Seaton directly holds 3,949 shares of common stock. This figure comes from the total shares following the A-code transaction, which reflects her direct ownership position separate from any indirect holdings via a trust.

What does the trust-related footnote in the COLB Form 4 mean?

The footnote states that 32,566 shares previously reported as directly owned are now indirectly beneficially owned via a trust. This changes how the shares are categorized—direct versus indirect ownership—but keeps them attributed to Seaton for beneficial ownership reporting.

COLB director awarded 3,949 shares in Form 4

SEATON ELIZABETH WHITEHEAD reported acquisition or exercise transactions in this Form 4 filing.

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Filing Sentiment

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Form Type

Rhea-AI Filing Summary

SEATON ELIZABETH WHITEHEAD reported acquisition or exercise transactions in this Form 4 filing.

COLUMBIA BANKING SYSTEM, INC. director Elizabeth Whitehead Seaton reported a routine equity grant and a change in how some shares are held. She received 3,949 shares of common stock as a grant, bringing her directly held shares to 3,949. A footnote explains that 32,566 shares previously reported as directly owned are now indirectly beneficially owned through a trust.

Insider Trade Summary

Grant/Award: 3,949 shares

Grant/Award 2 txns

Insider SEATON ELIZABETH WHITEHEAD

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 — 3,949 shares (Direct); Common Stock — 32,566 shares (Indirect, by trust)

Footnotes (1)

F1. 32,566 shares of the Issuer's common stock were previously reported as directly owned by the reporting person and are now indirectly beneficially owned by the reporting person via trust.

Key Figures

Stock grant: 3,949 shares Grant price: $0.0000 per share Direct holdings after grant: 3,949 shares +1 more

4 metrics

Stock grant 3,949 shares Common Stock grant reported with code A

Grant price $0.0000 per share Price per share for 3,949-share grant

Direct holdings after grant 3,949 shares Total shares following A-code transaction

Shares now held via trust 32,566 shares Reclassified from direct to indirect beneficial ownership

Key Terms

Grant, award, or other acquisition, indirectly beneficially owned, by trust

3 terms

Grant, award, or other acquisition financial

"transaction_code_description": "Grant, award, or other acquisition""

indirectly beneficially owned financial

"are now indirectly beneficially owned by the reporting person via trust"

by trust financial

"nature_of_ownership": "by trust""

FAQ

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

What did Elizabeth Whitehead Seaton report in this COLB Form 4 filing?

She reported a grant of common stock and a change in ownership form. The filing shows a grant of 3,949 COLB shares and reclassifies 32,566 shares from direct ownership to indirect beneficial ownership through a trust.

How many COLUMBIA BANKING SYSTEM (COLB) shares were granted to Seaton?

The filing shows a grant of 3,949 shares of common stock. These shares were acquired at a stated price of $0.0000 per share, indicating a compensation-related award rather than an open-market purchase of COLUMBIA BANKING SYSTEM, INC. stock.

Were there any open-market buys or sells of COLB stock in this Form 4?

The filing does not show any open-market purchases or sales. It reports one grant or award of 3,949 shares and one holding entry reflecting indirect ownership via trust, with no transactions coded as open-market buys (P) or sales (S).

What does transaction code "A" indicate in Seaton’s COLB Form 4?

Code “A” indicates a grant, award, or other acquisition of shares. In this case, Seaton acquired 3,949 COLB common shares at a price of $0.0000 per share, which is typical of stock awards granted as part of director compensation.

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

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Accepted by SEC EDGAR 05/18/2026 - 05:14 PM

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^*

SEATON ELIZABETH WHITEHEAD

(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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/14/2026		A		3,949	A	$0	3,949	D
Common Stock								32,566⁽¹⁾	I	by trust

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. 32,566 shares of the Issuer's common stock were previously reported as directly owned by the reporting person and are now indirectly beneficially owned by the reporting person via trust.

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)

Source: View Original Filing on SEC EDGAR