Columbia Banking director granted 2,670 shares

A Columbia Banking System director received a 2,670-share stock award and now holds additional shares both directly and through indirect accounts.

Rhea-AI Filing Summary

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

COLUMBIA BANKING SYSTEM, INC. (COLB) director Simone Lagomarsino received a grant of 2,670 shares of common stock on September 2, 2026, as an award with no cash price per share. After this award, Lagomarsino holds 2,670 shares directly, plus additional indirect holdings through a family trust and an IRA.

The director is reported as holding 32,931 shares indirectly through a family trust and 7 shares indirectly through an IRA. No transactions in this filing are reported as being made under a Rule 10b5-1 trading plan.

Insider Trade Summary

Grant/Award: 2,670 shares

Grant/Award 3 txns

Insider LAGOMARSINO SIMONE

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	2,670	$0.00	$0.00
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 2,670 shares (Direct); Common Stock — 32,931 shares (Indirect, by family trust); Common Stock — 7 shares (Indirect, by IRA)

Key Figures

Shares acquired by award: 2,670 shares Direct holdings after award: 2,670 shares Indirect holdings via family trust: 32,931 shares +2 more

5 metrics

Shares acquired by award 2,670 shares Common stock grant to director on September 2, 2026

Direct holdings after award 2,670 shares Common stock held directly by Simone Lagomarsino after September 2, 2026 grant

Indirect holdings via family trust 32,931 shares Common stock held indirectly through a family trust as reported on September 2, 2026

Indirect holdings via IRA 7 shares Common stock held indirectly through an IRA as reported on September 2, 2026

Rule 10b5-1 trading plan status No Rule 10b5-1 plan reported Applies to the transactions reported for September 2, 2026

FAQ

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

What insider transaction did COLB report for director Simone Lagomarsino?

The filing reports that director Simone Lagomarsino received a grant of 2,670 shares of Columbia Banking System common stock on September 2, 2026, as an award with no cash price per share, increasing direct ownership to 2,670 shares.

How many COLB shares does Simone Lagomarsino now hold directly and indirectly?

After the reported award, Simone Lagomarsino holds 2,670 shares directly, plus 32,931 shares indirectly through a family trust and 7 shares indirectly through an IRA, as of the September 2, 2026 report.

Was the COLB insider stock award to Simone Lagomarsino a market purchase?

No. The Form 4 shows the 2,670 COLB shares were acquired as a grant or award on September 2, 2026, at a reported cash price of zero per share, rather than as a purchase in the market.

Does the Simone Lagomarsino Form 4 for COLB involve any reported stock sales?

No. The summary of reported transactions shows one acquisition by grant of 2,670 shares and no reported sales or dispositions of Columbia Banking System common stock in this filing.

Is the COLB insider transaction for Simone Lagomarsino under a Rule 10b5-1 plan?

The filing indicates that no Rule 10b5-1 trading plan is reported for these transactions. The grant of 2,670 shares on September 2, 2026 is reported without reference to any trading plan.

How are Simone Lagomarsino’s indirect COLB holdings structured?

According to the filing, Simone Lagomarsino holds 32,931 COLB shares indirectly through a family trust and 7 COLB shares indirectly through an IRA, in addition to the 2,670 shares held directly.

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

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Available on EDGAR 09/04/2026 - 04:42 PM EDT Accepted by SEC EDGAR 09/04/2026 - 04:41 PM EDT 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^*

LAGOMARSINO SIMONE

(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)
09/02/2026

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	09/02/2026		A		2,670	A	$0	2,670	D
Common Stock								32,931	I	by family trust
Common Stock								7	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/ Kumi Yamamoto Baruffi, Attorney-in-fact	09/04/2026
	** 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)