Shareholder plans Rule 144 sale of 13,725 Columbia Banking (COLB) shares on NASDAQ

Rhea-AI Filing Summary

Columbia Banking System, Inc. (COLB) has a shareholder filing to sell common stock under Rule 144. The notice covers 13,725 shares of common stock to be sold through Fidelity Brokerage Services LLC on or about 01/30/2026 on the NASDAQ market, with an aggregate market value of 403,927.36. Shares outstanding for the issuer are listed as 299,120,976 common shares.

The shares to be sold were originally acquired in two open market purchases from the issuer: 4,575 common shares on 11/21/2013 and 9,150 common shares on 04/25/2014, both paid in cash on their respective acquisition dates. The person for whose account the securities are to be sold represents that they do not know of any material adverse, non‑public information about the issuer’s current or prospective operations.

Insights

Equity capital markets analyst

Rule 144 filing details a modest secondary sale of existing COLB shares.

This notice describes a planned Rule 144 sale of 13,725 Columbia Banking System common shares on NASDAQ through Fidelity, with an aggregate market value of 403,927.36. The filing lists 299,120,976 common shares outstanding for context.

The shares come from prior open market purchases in 2013 and 2014, both acquired for cash directly from the issuer. This is a secondary sale by an existing holder, with proceeds going to that holder rather than to Columbia Banking System.

The person on whose behalf the shares will be sold affirms they do not know of any undisclosed material adverse information about the issuer’s operations. Actual impact on trading will depend on market liquidity and execution around the approximate sale date of 01/30/2026.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	13725	403927.36	299120976	01/30/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	11/21/2013	Open Market Purchase	Issuer			4575	11/21/2013	Cash
Common	04/25/2014	Open Market Purchase	Issuer			9150	04/25/2014	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks

Date of Notice

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the Form 144 filing for Columbia Banking System (COLB) disclose?

The Form 144 discloses a planned Rule 144 sale of 13,725 Columbia Banking System common shares on NASDAQ through Fidelity Brokerage Services LLC, with an aggregate market value of 403,927.36. It documents the intention to sell restricted or control securities under SEC Rule 144.

How many Columbia Banking System (COLB) shares are planned to be sold and on what date?

The filing indicates an intention to sell 13,725 common shares of Columbia Banking System. The approximate date of sale listed is 01/30/2026. These sales are expected to occur on the NASDAQ exchange through Fidelity Brokerage Services LLC as the broker.

What is the aggregate market value of the COLB shares covered by this Form 144?

The Form 144 lists an aggregate market value of 403,927.36 for the 13,725 Columbia Banking System common shares to be sold. This value reflects the market price used in the notice for the planned Rule 144 transaction on NASDAQ.

How and when were the Columbia Banking System (COLB) shares being sold originally acquired?

The shares were acquired in two cash, open market purchases from the issuer: 4,575 common shares on 11/21/2013 and 9,150 common shares on 04/25/2014. In each case, payment was made in cash on the respective acquisition date.

How many Columbia Banking System (COLB) shares are outstanding according to this notice?

The notice reports that 299,120,976 common shares of Columbia Banking System are outstanding. This figure provides context for the relative size of the 13,725-share Rule 144 sale disclosed in the filing, which represents a very small fraction of total shares.

Does the person selling COLB shares under this Form 144 claim to know any undisclosed bad news?

The person for whose account the COLB shares are to be sold represents that they do not know any material adverse information about the issuer’s current or prospective operations that has not been publicly disclosed, as required in the Form 144 representation language.