EVP boosts stake in Columbia Banking (NASDAQ: COLB) with ESPP buy

Rhea-AI Filing Summary

Columbia Banking System EVP Aaron James Deer, Chief Strategy and Innovation Officer, bought 886 shares of common stock in an open-market transaction recorded as an ESPP purchase at $25.37 per share. After this transaction, he directly owns 42,761 common shares, indicating a small incremental increase in his personal stake.

Insider Trade Summary

Net Buyer: 886 shares ($22,478)

Net Buy 1 txn

Insider Deer Aaron James

Role EVP Chief Strategy/Innov Offcr

Bought 886 shs ($22K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	886	$25.37	$22K

Holdings After Transaction: Common Stock — 42,761 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares purchased: 886 shares Purchase price: $25.37 per share Shares held after transaction: 42,761 shares +1 more

4 metrics

Shares purchased 886 shares Open-market ESPP-related buy on 2026-06-30

Purchase price $25.37 per share Price paid for common stock

Shares held after transaction 42,761 shares Direct ownership following purchase

Net buy shares 886 shares Net change from this Form 4

Key Terms

ESPP, open-market purchase, Common Stock, Form 4

4 terms

ESPP financial

"The footnote labeled “ESPP Purchase” indicates the transaction occurred through an employee stock purchase plan."

An Employee Stock Purchase Plan (ESPP) is a company program that lets employees buy the company’s shares at a reduced price, usually by setting aside a small portion of their pay over time. It matters to investors because it encourages employees to own part of the business—like giving staff a discounted membership— which can boost commitment and performance, while also potentially increasing the number of shares available and affecting shareholder value.

open-market purchase financial

"The transaction was coded as an open-market purchase and noted as an ESPP purchase."

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

Common Stock financial

"He purchased 886 shares of Columbia Banking System common stock at $25.37 per share."

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 regulatory

"This Form 4 reports a buy transaction for Aaron James Deer."

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/02/2026 - 05:17 PM Accepted by SEC EDGAR 07/02/2026 - 05:17 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).

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 WASHINGTON 98402

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/30/2026

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

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

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

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	06/30/2026		P		886(1)	A	$25.37	42,761	D

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

Explanation of Responses:

1. ESPP Purchase

Remarks:

	/s/ Andrea M. Newburn, Attorney-in-fact	07/02/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did COLB executive Aaron James Deer report?

Aaron James Deer reported buying 886 shares of Columbia Banking System common stock. The transaction was coded as an open-market purchase and noted as an ESPP purchase, indicating participation in an employee stock purchase plan at a specified share price.

How many COLB shares did Aaron James Deer purchase and at what price?

He purchased 886 shares of Columbia Banking System common stock at $25.37 per share. This transaction reflects a relatively small incremental addition to his holdings while documenting the exact price paid in the open market under the ESPP designation.

What are Aaron James Deer’s total COLB holdings after this Form 4 transaction?

Following the purchase, Aaron James Deer directly holds 42,761 shares of Columbia Banking System common stock. This post-transaction figure, disclosed in the filing, shows his updated ownership level after adding the 886 ESPP-related shares to his existing position.

What does the ESPP footnote mean in Aaron James Deer’s COLB filing?

The footnote labeled “ESPP Purchase” indicates the transaction occurred through an employee stock purchase plan. This typically allows employees to buy company stock on defined terms, and the filing clarifies that Deer’s 886-share acquisition was made under that program.

Is this COLB Form 4 transaction a buy or sell for Aaron James Deer?

This Form 4 reports a buy transaction for Aaron James Deer. The code “P” and the transaction description identify it as an open-market purchase, and the summary data show a net increase of 886 shares in his directly held Columbia Banking System position.