[Form 4] Columbia Banking Systems Inc Insider Trading Activity

Insider Trade Summary

Grant/Award: 14,359 shares

Grant/Award 3 txns

Insider Giem Judi

Role EVP CHRO

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Unit	7,179	$24.38	$175K
Grant/Award	Performance Restricted Stock Unit	3,590	$24.38	$88K
Grant/Award	Performance Restricted Stock Unit	3,590	$24.38	$88K

Holdings After Transaction: Restricted Stock Unit — 7,179 contracts (Direct); Performance Restricted Stock Unit — 7,180 contracts (Direct)

Footnotes (3)

1. F1. Restricted stock units granted 07/22/2025. The grant will vest 33.33% per year over three years.
2. F2. Performance restricted stock units granted 07/22/2025. The grant will vest approximately three years following the grant date based on the issuer's relative total shareholder return performance for fiscal years 2025-2027 compared to a Compensation Committee approved group of peers.
3. F3. Performance restricted stock units granted 07/22/2025. The grant will vest approximately three years following the grant date based on the issuer's relative return on tangible common equity for fiscal years 2025-2027 compared to a Compensation Committee approved group of peers.

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Accepted by SEC EDGAR 07/23/2025 - 06:46 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).

1. Name and Address of Reporting Person^*

Giem Judi

(Last) (First) (Middle)

C/O COLUMBIA BANKING SYSTEM, INC.

1301 A STREET

(Street)

TACOMA WA 98402

(City) (State) (Zip)

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

3. Date of Earliest Transaction (Month/Day/Year)
07/22/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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

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)	07/22/2025		A		7,179		(1)	(1)	Common Stock	7,179	$24.38	7,179	D
Performance Restricted Stock Unit	(2)	07/22/2025		A		3,590		(2)	(2)	Common Stock	3,590	$24.38	3,590	D
Performance Restricted Stock Unit	(3)	07/22/2025		A		3,590		(3)	(3)	Common Stock	3,590	$24.38	7,180	D

Explanation of Responses:

1. Restricted stock units granted 07/22/2025. The grant will vest 33.33% per year over three years.

2. Performance restricted stock units granted 07/22/2025. The grant will vest approximately three years following the grant date based on the issuer's relative total shareholder return performance for fiscal years 2025-2027 compared to a Compensation Committee approved group of peers.

3. Performance restricted stock units granted 07/22/2025. The grant will vest approximately three years following the grant date based on the issuer's relative return on tangible common equity for fiscal years 2025-2027 compared to a Compensation Committee approved group of peers.

Remarks:

	/s/ Lisa M. White, Attorney-in-fact	07/23/2025
	** 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.