SEC FORM 5

SEC FORM 5 SEC Form 5

FORM 5

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

ANNUAL 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

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Form 3 Holdings Reported.

Form 4 Transactions Reported.

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^*

Namdar Frank

(Last)

(First)

(Middle)

C/O COLUMBIA BANKING SYSTEM, INC.

PO BOX 2156, MS 3100

(Street)

TACOMA

98401-2156

(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)
	Chief Credit Officer

3. Statement for Issuer's Fiscal Year Ended (Month/Day/Year)
12/31/2023

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 at end of Issuer's Fiscal Year (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)	3. Transaction Code (Instr. 8)	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)

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)	4. Transaction Code (Instr. 8)	(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)
Common Stock	⁽¹⁾	03/17/2023		4A	352		⁽¹⁾	⁽¹⁾	Common	352	$21.47	2,737⁽²⁾⁽³⁾	I	Deferred Compensation
Common Stock	⁽¹⁾	04/13/2023		4A		1	⁽¹⁾	⁽¹⁾	Common	1	$21.86	2,736⁽³⁾	I	Deferred Compensation
Common Stock	⁽¹⁾	06/15/2023		4A	43		⁽¹⁾	⁽¹⁾	Common	43	$22.68	2,779⁽³⁾	I	Deferred Compensation
Common Stock	⁽¹⁾	07/14/2023		4A		1	⁽¹⁾	⁽¹⁾	Common	1	$21.75	2,778⁽³⁾	I	Deferred Compensation
Common Stock	⁽¹⁾	09/11/2023		4A	49		⁽¹⁾	⁽¹⁾	Common	49	$20.49	2,827⁽³⁾	I	Deferred Compensation
Common Stock	⁽¹⁾	10/11/2023		4A		1	⁽¹⁾	⁽¹⁾	Common	1	$19.83	2,826⁽³⁾	I	Deferred Compensation
Common Stock	⁽¹⁾	12/11/2023		4A	41		⁽¹⁾	⁽¹⁾	Common	41	$24.89	2,867⁽³⁾	I	Deferred Compensation

Explanation of Responses:

1. Not required.

2. 2,385 shares in respect of deferred compensation plan obligations were previously inadvertently disclosed on Form 3 as held directly by the reporting person.

3. Holdings reported include shares acquired in the issuer's Nonqualified Deferred Compensation Plan through dividend reinvestment, payroll deferrals and/or employer contributions in transactions that were exempt under Rule 16b-3(c).

Remarks:

	/s/ Lisa M. White, Attorney-in-fact	02/14/2024
	** 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).
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