Columbia Banking EVP converts 2,393 RSUs at $32.69

COLUMBIA BANKING SYSTEM, INC.

Rhea-AI Filing Summary

COLUMBIA BANKING SYSTEM, INC. (COLB) reported insider equity activity by EVP and CHRO Judi Giem. On August 14, 2026, 2,393 Restricted Stock Units converted into an equal number of common shares at a reported value of $32.69 per share. Of these shares, 643 common shares were delivered or withheld for payment of exercise price or tax liability, and 13,108 Restricted Stock Units remained outstanding after the conversion. The filing’s Rule 10b5-1 trading-plan box was not checked.

Insider Trade Summary

2,393 shares exercised/converted

Exercise 3 txns

Insider Giem Judi

Role EVP CHRO

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit F1	2,393	--	--
Exercise	Common Stock	2,393	$32.69	$78K
Exercise Price or Tax Liability	Common Stock	643	$32.69	$21K

Holdings After Transaction: Restricted Stock Unit — 13,108 contracts (Direct); Common Stock — 1,750 shares (Direct)

Footnotes (1)

1. F1. Restricted Stock Units convert into common stock on a one-for-one basis. On July 22, 2025, the reporting person was granted 7,179 Restricted Stock Units, which vest in three annual installments beginning on August 14, 2026.

Key Figures

RSUs converted: 2,393 shares Common shares received: 2,393 shares Shares delivered/withheld: 643 shares +3 more

6 metrics

RSUs converted 2,393 shares Restricted Stock Units converting into common stock on August 14, 2026

Common shares received 2,393 shares Common stock acquired upon RSU conversion at $32.69 per share

Shares delivered/withheld 643 shares Common shares delivered or withheld for payment of exercise price or tax liability

Per-share value $32.69 per share Price applied to common stock transactions on August 14, 2026

RSUs remaining 13,108 units Restricted Stock Units held after the reported RSU conversion

Total RSU grant 7,179 units Restricted Stock Units granted on July 22, 2025, vesting in three annual installments from August 14, 2026

Key Terms

Restricted Stock Unit, derivative security, exercise price or tax liability

3 terms

Restricted Stock Unit financial

"Restricted Stock Units convert into common stock on a one-for-one basis"

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

derivative security financial

"Exercise or conversion of derivative security"

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

exercise price or tax liability financial

"Payment of exercise price or tax liability by delivering or withholding securities"

FAQ

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

What insider transaction did COLB executive Judi Giem report on August 14, 2026?

Judi Giem reported the conversion of 2,393 Restricted Stock Units into common stock of COLUMBIA BANKING SYSTEM, INC. on August 14, 2026. These units converted on a one-for-one basis into an equal number of common shares.

At what price were the COLB shares associated with Judi Giem’s Form 4 valued?

The common stock in Judi Giem’s Form 4 was reported at $32.69 per share. This price applied to 2,393 common shares received from RSU conversion and to 643 shares delivered or withheld for payment of exercise price or tax liability.

How many Restricted Stock Units does Judi Giem hold after the reported COLB transactions?

After the August 14, 2026 RSU conversion, Judi Giem held 13,108 Restricted Stock Units. These remaining units are separate from the common shares received and reflect her continuing derivative equity position in COLB.

How many COLB shares were delivered or withheld for exercise price or taxes in this Form 4?

A total of 643 common shares of COLUMBIA BANKING SYSTEM, INC. were delivered or withheld. The filing states these shares were used for payment of exercise price or tax liability related to the RSU conversion.

Was Judi Giem’s COLB Form 4 filed under a Rule 10b5-1 trading plan?

The Form 4 for COLUMBIA BANKING SYSTEM, INC. indicates the Rule 10b5-1 checkbox is not checked. This means the filing does not affirm that the reported transactions were executed pursuant to a Rule 10b5-1 trading plan.

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

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Available on EDGAR 08/18/2026 - 04:51 PM Accepted by SEC EDGAR 08/18/2026 - 04:50 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^*

Giem Judi

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP CHRO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/14/2026

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	08/14/2026		M		2,393	A	$32.69	2,393	D
Common Stock	08/14/2026		F		643	D	$32.69	1,750	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
Restricted Stock Unit	(1)	08/14/2026		M			2,393	(1)	(1)	Common Stock	2,393	(1)	13,108	D

Explanation of Responses:

1. Restricted Stock Units convert into common stock on a one-for-one basis. On July 22, 2025, the reporting person was granted 7,179 Restricted Stock Units, which vest in three annual installments beginning on August 14, 2026.

Remarks:

	/s/ Kumi Yamamoto Baruffi, Attorney-in-fact	08/18/2026
	** 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)