Columbia Banking exec sells 4,481 shares

COLUMBIA BANKING SYSTEM, INC.

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Rhea-AI Filing Summary

COLUMBIA BANKING SYSTEM, INC. Senior Executive VP Nixon Torran B reported open-market sales of common stock. On 2026-03-04, he sold 2,240 shares at an average price of $28.85, and on 2026-03-03 he sold 2,241 shares at $28.25.

After these transactions, he held 98,229 shares directly. Indirect holdings included 3,650 shares by a family trust and 1,876 shares by a 401(k) as of 2026-03-03. An open-market sale was made pursuant to a Rule 10b5-1 trading plan established on 2025-11-25.

Insider Trade Summary

Net Seller: 4,481 shares

Net Sell 4 txns

Insider Nixon Torran B

Role Senior Executive VP

Sold 4,481 shs ($128K)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,240	$28.85	$65K
Sale	Common Stock	2,241	$28.25	$63K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 98,229 shares (Direct); Common Stock — 3,650 shares (Indirect, by family trust); Common Stock — 1,876 shares (Indirect, by 401(k))

Footnotes (1)

F1. Open market sale pursuant to a 10B5-1 Plan which was established by Reporting Person on November 25, 2025, in accordance with Rule 10B5-1 of the Securities Exchange Act of 1934, as amended.

FAQ

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What insider transactions did COLB report for Nixon Torran B?

COLUMBIA BANKING SYSTEM, INC. reported that Senior Executive VP Nixon Torran B sold 2,240 shares at $28.85 on 2026-03-04 and 2,241 shares at $28.25 on 2026-03-03, both as open-market sales of common stock.

How many COLB shares did Nixon Torran B sell and at what prices?

He sold a total of 4,481 COLB common shares. This included 2,240 shares at an average price of $28.85 on 2026-03-04 and 2,241 shares at $28.25 on 2026-03-03 in open-market transactions.

How many COLB shares does Nixon Torran B hold after these transactions?

Following the reported sales, Nixon Torran B held 98,229 COLB common shares directly. In addition, 3,650 shares were held indirectly by a family trust and 1,876 shares were held indirectly by a 401(k), all as of early March 2026.

Were the COLB insider sales by Nixon Torran B under a trading plan?

At least one open-market sale was executed under a Rule 10b5-1 trading plan. The plan was established by the reporting person on 2025-11-25 in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934.

What indirect COLB shareholdings are reported for Nixon Torran B?

The filing shows indirect ownership of 3,650 COLB common shares held by a family trust and 1,876 shares held by a 401(k). These positions are reported as indirect beneficial ownership separate from the 98,229 shares held directly.

What role does Nixon Torran B hold at Columbia Banking System, Inc.?

Nixon Torran B is identified in the filing as an officer of COLUMBIA BANKING SYSTEM, INC., serving as Senior Executive VP. The reported transactions relate to his beneficial ownership of the company’s common stock as of early March 2026.

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Accepted by SEC EDGAR 03/05/2026 - 04:27 PM

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^*

Nixon Torran B

(Last)

(First)

(Middle)

C/O COLUMBIA BANKING SYSTEM, INC.

1301 A STREET

(Street)

TACOMA

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)
	Senior Executive VP

3. Date of Earliest Transaction (Month/Day/Year)
03/03/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	03/03/2026		S⁽¹⁾		2,241	D	$28.25	100,469	D
Common Stock	03/04/2026		S⁽¹⁾		2,240	D	$28.85	98,229	D
Common Stock								3,650	I	by family trust
Common Stock								1,876	I	by 401(k)

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)	Code	V	(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)

Explanation of Responses:

1. Open market sale pursuant to a 10B5-1 Plan which was established by Reporting Person on November 25, 2025, in accordance with Rule 10B5-1 of the Securities Exchange Act of 1934, as amended.

Remarks:

	/s/ Andrea M. Newburn, Attorney-in-fact	03/05/2026
	** 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.

Source: View Original Filing on SEC EDGAR