Columbia Banking (NASDAQ: COLB) exec vests 5,013 RSUs, with 2,002 shares withheld for taxes

Rhea-AI Filing Summary

Columbia Banking System senior executive Torran B. Nixon reported routine equity compensation activity. On March 13, 2026, 5,013 Restricted Stock Units converted into the same number of common shares, reflecting the first vesting installment from a 15,037-unit grant made on February 25, 2025.

To cover tax obligations, 2,002 common shares were withheld at $26.23 per share, a non‑market, tax-withholding disposition rather than an open-market sale. Following this vesting, Nixon still holds 49,052 Restricted Stock Units, which are scheduled to vest in later installments, and also has indirect common stock holdings through a family trust and a 401(k) plan.

Insider Trade Summary

5,013 shares exercised/converted

Mixed 5 txns

Insider Nixon Torran B

Role Senior Executive VP

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit	5,013	$0.00	--
Exercise	Common Stock	5,013	$26.23	$131K
Tax Withholding	Common Stock	2,002	$26.23	$53K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Restricted Stock Unit — 49,052 shares (Direct); Common Stock — 103,242 shares (Direct); Common Stock — 3,650 shares (Indirect, by family trust)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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 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)
	Senior Executive VP

3. Date of Earliest Transaction (Month/Day/Year)
03/13/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/13/2026		M		5,013	A	$26.23	103,242	D
Common Stock	03/13/2026		F		2,002	D	$26.23	101,240	D
Common Stock								3,650	I	by family trust
Common Stock								1,910	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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Unit	(1)	03/13/2026		M			5,013	(1)	(1)	Common Stock	5,013	$0	49,052	D

Explanation of Responses:

1. Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 15,037 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026.

Remarks:

	/s/ Andrea M. Newburn, Attorney-in-fact	03/17/2026
	** 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.

FAQ

What insider transaction did Torran B. Nixon report for COLB?

Senior Executive VP Torran B. Nixon reported RSU vesting that converted 5,013 Restricted Stock Units into common stock. The activity reflects routine equity compensation rather than open-market trading and was paired with share withholding to satisfy tax obligations on the vested stock.

How many Columbia Banking System RSUs vested for Torran Nixon?

5,013 Restricted Stock Units vested for Torran Nixon, converting one-for-one into common stock. These units are the first of three annual installments from a 15,037-unit grant awarded on February 25, 2025, with vesting beginning on March 13, 2026.

How many COLB shares were withheld for taxes in Nixon’s Form 4?

2,002 Columbia Banking System common shares were withheld at $26.23 per share for tax obligations. This F‑code transaction is a tax-withholding disposition, meaning the shares were used to pay taxes rather than sold in the open market for investment purposes.

Did Torran Nixon make any open-market buy or sell of COLB stock?

No open-market buys or sells were reported. The Form 4 shows RSU vesting, conversion into 5,013 common shares, and 2,002 shares withheld to cover taxes. These events are compensation-related and do not reflect discretionary open-market trading decisions by the executive.

How many Restricted Stock Units does Nixon still hold after this COLB transaction?

After the March 13, 2026 vesting, Nixon still holds 49,052 Restricted Stock Units. These remaining RSUs are part of longer-term compensation and are expected to vest in future installments according to the original grant schedule disclosed in the footnote.

What indirect COLB holdings are reported for Torran Nixon?

The filing shows indirect ownership of Columbia Banking System common stock through a family trust and a 401(k) plan. Each indirect line lists total shares following the reported date, indicating long-term holdings managed within those vehicles rather than direct trading activity.