Executive Aaron James Deer receives 4,001 RSUs at Columbia Banking System (COLB)

Rhea-AI Filing Summary

Deer Aaron James reported acquisition or exercise transactions in this Form 4 filing.

Columbia Banking System, Inc. executive Aaron James Deer, EVP Chief Strategy/Innovation Officer, reported receiving a grant of 4,001 restricted stock units on February 18, 2026 at a reference price of $31.24 per unit. The award will vest 33.33% per year over three years, and his directly held restricted stock units total 8,700 after this grant.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Deer Aaron James

Role EVP Chief Strategy/Innov Offcr

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Unit	4,001	$31.24	$125K

Holdings After Transaction: Restricted Stock Unit — 8,700 shares (Direct)

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^*

Deer Aaron James

(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 Chief Strategy/Innov Offcr

3. Date of Earliest Transaction (Month/Day/Year)
02/18/2026

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

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)	02/18/2026		A		4,001		(1)	(1)	Common Stock	4,001	$31.24	8,700	D

Explanation of Responses:

1. Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years.

Remarks:

	/s/ Andrea M. Newburn, Attorney-in-fact	02/20/2026
	** 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 Columbia Banking System (COLB) report for Aaron James Deer?

Columbia Banking System reported that executive Aaron James Deer received a grant of 4,001 restricted stock units on February 18, 2026. These units are equity-based awards that increase his direct holdings to a total of 8,700 restricted stock units following the transaction.

What type of security did Aaron James Deer acquire in the latest Columbia Banking System (COLB) Form 4?

Aaron James Deer acquired restricted stock units in Columbia Banking System, Inc. The Form 4 shows a grant of 4,001 restricted stock units, which are derivative equity awards that typically convert into common shares as they vest under the company’s compensation arrangements.

When do Aaron James Deer’s newly granted Columbia Banking System (COLB) restricted stock units vest?

The restricted stock units granted to Aaron James Deer on February 18, 2026 vest over three years. The vesting schedule is 33.33% per year, meaning equal annual portions become payable each year until the full award is vested, assuming applicable conditions are satisfied.

How many Columbia Banking System (COLB) restricted stock units does Aaron James Deer hold after this Form 4 transaction?

After the reported grant, Aaron James Deer holds a total of 8,700 restricted stock units directly. The Form 4 indicates that this figure reflects his holdings following the 4,001-unit award that was granted on February 18, 2026 as part of his equity compensation.

What was the reference price per unit for Aaron James Deer’s Columbia Banking System (COLB) restricted stock unit grant?

The Form 4 lists a price of $31.24 per restricted stock unit for the 4,001-unit grant. This price is typically a reference or fair market value used for reporting purposes and does not necessarily represent cash paid by the executive for the award.

What is Aaron James Deer’s role at Columbia Banking System (COLB) according to the Form 4?

According to the Form 4, Aaron James Deer serves as an officer of Columbia Banking System, Inc. His stated title is EVP Chief Strategy/Innov Offcr, indicating an executive vice president role overseeing strategy and innovation functions within the organization’s leadership team.