Form 8-K

8-K — BANNER CORP

Accession: 0000946673-26-000169

Filed: 2026-08-03

Period: 2026-08-03

CIK: 0000946673

SIC: 6022 (STATE COMMERCIAL BANKS)

Item: Other Events

Item: Financial Statements and Exhibits

Documents

8-K — banr-20260803.htm (Primary)

EX-99.1 — PRESS RELEASE OF BANNER CORPORATION DATED AUGUST 3, 2026 (banr-ex991stockrepurchasep.htm)

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8-K

8-K (Primary)

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banr-20260803

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): August 3, 2026

Banner Corporation

(Exact name of registrant as specified in its charter)

Washington

000-26584

91-1691604

(State or other jurisdiction of incorporation) (Commission File Number) (I.R.S. Employer Identification No.)

10 S. First Avenue, Walla Walla, Washington 99362

(Address of principal executive offices) (Zip Code)

Registrant's telephone number (including area code) (509) 527-3636

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

[ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

[ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common Stock, par value $.01 per share BANR The NASDAQ Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 8.01 Other Events.

On August 3, 2026, Banner Corporation (“Company”) announced that the Company’s Board of Directors had authorized the repurchase of up to 1.7 million shares of its common stock, or approximately 5% of the Company’s issued and outstanding common stock.

The news release announcing the stock repurchase program is attached as Exhibit 99.1 and incorporated by reference herein.

Item 9.01 Financial Statements and Exhibits.*

(d) Exhibits

99.1 Press Release of Banner Corporation dated August 3, 2026

104 Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.

BANNER CORPORATION

Date: August 3, 2026

By: /s/ Robert G Butterfield

Robert G Butterfield

Executive Vice President, Treasurer and

Chief Financial Officer

EX-99.1 — PRESS RELEASE OF BANNER CORPORATION DATED AUGUST 3, 2026

EX-99.1

Filename: banr-ex991stockrepurchasep.htm · Sequence: 2

Document

Exhibit 99.1

CONTACT: MARK J. GRESCOVICH,

PRESIDENT & CEO

ROBERT G. BUTTERFIELD, CFO

(509) 527-3636

NEWS RELEASE

Banner Corporation Announces Stock Repurchase Program

Walla Walla, Wash – August 3, 2026 - Banner Corporation (NASDAQ GSM: BANR) (“Company”), the parent company of Banner Bank, today announced that its Board of Directors has authorized the repurchase of up to 1.7 million shares of the Company’s common stock, which is approximately 5% of its issued and outstanding common stock.

“We believe our stock represents an attractive value proposition, and that repurchasing shares is a sound way to build long-term value for our shareholders,” said Mark J. Grescovich, President and Chief Executive Officer. Under the repurchase program, shares may be repurchased by the Company in open market purchases. The extent to which the Company repurchases its shares and the timing of such repurchases will depend upon market conditions and other corporate considerations.

About the Company

Banner Corporation is a $16.59 billion bank holding company operating a commercial bank in four Western states through a network of branches offering a full range of deposit services and business, commercial real estate, construction, residential, agricultural and consumer loans. Visit Banner Bank on the Web at www.bannerbank.com.

Forward-Looking Statements

This press release contains statements that the Company believes are “forward-looking statements.” These statements relate to the Company’s financial condition, results of operations, plans, objectives, future performance or business. You should not place undue reliance on these statements, as they are subject to risks and uncertainties, and actual results and performance in future periods may be materially different from any future results or performance suggested by the forward-looking statements in this release. Factors that might cause such differences include, but are not limited to, those identified in our risk factors contained in Banner Corporation’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025. Such forward-looking statements speak only as of the date of this release. Banner Corporation expressly disclaims any obligation to update or revise any forward-looking statements found herein to reflect any changes in the Company’s expectations of results or any change in events.

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Cover

Aug. 03, 2026

Document Information [Line Items]

Document Type

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Document Period End Date

Aug. 03, 2026

Entity Registrant Name

Banner Corporation

Entity Incorporation, State or Country Code

Entity File Number

000-26584

Entity Tax Identification Number

91-1691604

Entity Address, Address Line One

10 S. First Avenue,

Entity Address, City or Town

Walla Walla

Entity Address, State or Province

Entity Address, Postal Zip Code

99362

City Area Code

509

Local Phone Number

527-3636

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Title of 12(b) Security

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Trading Symbol

BANR

Security Exchange Name

NASDAQ

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