Columbia Banking director granted 2,577 shares

Director Steven R. Gardner reported a stock award and significant family-trust holdings in Columbia Banking System, Inc.

Rhea-AI Filing Summary

COLUMBIA BANKING SYSTEM, INC. (symbol: COLB) is the issuer of record for a Form 4 filing submitted to the SEC. GARDNER STEVEN R reported acquisition or exercise transactions in this Form 4 filing.

COLUMBIA BANKING SYSTEM, INC. (COLB) reported that director Steven R. Gardner received a grant or award of 2,577 shares of Common Stock on September 4, 2026, at no stated purchase price, bringing his directly held shares to 2,577. He also reports indirect ownership of 570,370 shares held by a family trust.

Insider Trade Summary

Grant/Award: 2,577 shares

Grant/Award 2 txns

Insider GARDNER STEVEN R

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	2,577	$0.00	$0.00
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 2,577 shares (Direct); Common Stock — 570,370 shares (Indirect, by family trust)

Key Figures

Shares acquired via grant: 2,577 shares Reported grant price: $0.00 per share Direct holdings after transaction: 2,577 shares +1 more

4 metrics

Shares acquired via grant 2,577 shares Grant or award of Common Stock on September 4, 2026

Reported grant price $0.00 per share Price field for the 2,577-share stock award

Direct holdings after transaction 2,577 shares Common Stock directly owned by Steven R. Gardner after the award

Indirect holdings by family trust 570,370 shares Common Stock held indirectly by a family trust

Key Terms

grant or award, indirect ownership, family trust, Rule 10b5-1 trading plan

4 terms

grant or award financial

"reported a grant or award of 2,577 shares of Common Stock"

indirect ownership financial

"He also reports indirect ownership of 570,370 shares held by a family trust"

family trust financial

"570,370 shares held indirectly by a family trust"

Rule 10b5-1 trading plan regulatory

"indicates no Rule 10b5-1 trading plan for the reported transactions"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

FAQ

What insider transaction did COLB director Steven R. Gardner report?

He reported a grant or award of 2,577 shares of Columbia Banking System, Inc. Common Stock on September 4, 2026, at a reported price of $0.00 per share, classified as a grant or other acquisition.

How many COLB shares does Steven R. Gardner now hold directly?

Following the September 4, 2026 award, Steven R. Gardner directly holds 2,577 shares of Columbia Banking System, Inc. Common Stock, as reported in the filing.

What are Steven R. Gardner’s indirect holdings of COLB stock?

He reports 570,370 shares of Columbia Banking System, Inc. Common Stock held indirectly by a family trust, according to the holding information in the Form 4.

Was Steven R. Gardner’s COLB stock award made under a Rule 10b5-1 plan?

No. The Form 4 indicates no Rule 10b5-1 trading plan for the reported transactions, meaning the grant was not identified as being executed under such a pre-arranged plan.

Did Steven R. Gardner sell any COLB shares in this Form 4?

No. The Form 4 shows a grant or award acquisition of 2,577 shares and an indirect holding entry, with no reported sales or dispositions of Columbia Banking System, Inc. stock in this filing.

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Available on EDGAR 09/08/2026 - 05:25 PM Accepted by SEC EDGAR 09/08/2026 - 05:24 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^*

GARDNER STEVEN R

(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)
09/04/2026

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	09/04/2026		A		2,577	A	$0	2,577	D
Common Stock								570,370	I	by family 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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

	/s/ Kumi Yamamoto Baruffi, Attorney-in-fact	09/08/2026
	** 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)