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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): October 15, 2025
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 2.02 Results of Operations and Financial Condition.*
On October 15, 2025, Banner Corporation issued its earnings release for the quarter ended September 30, 2025. A copy of the earnings release is furnished herewith as Exhibit 99.1, and is incorporated herein by reference.
Item 7.01 Regulation FD Disclosure.*
Banner Corporation intends to review the investor presentation attached as Exhibit 99.2 to this Current Report on Form 8-K in conjunction with its earnings release conference call on October 16, 2025, and from time to time in presentations to investors and other stakeholders.
Item 8.01 Other Events.
On October 15, 2025, Banner Corporation announced its Board of Directors declared a regular quarterly cash dividend on Banner Corporation common stock of $0.50 per share, payable on November 14, 2025 to stockholders of record as of the close of business on November 4, 2025.
Item 9.01 Financial Statements and Exhibits.*
(d) Exhibits
99.1 Press Release of Banner Corporation dated October 15, 2025.
99.2 Banner Corporation Investor Materials
104 Cover Page Interactive Data File (embedded within the Inline XBRL document)
* The information furnished under Item 2.02, Item 7.01 and Item 9.01 of this Current Report on Form 8-K, including the exhibits, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to liabilities under that Section, nor shall it be deemed incorporated by reference in any registration statement or other filings of Banner Corporation under the Securities Act of 1933, as amended, except as shall be set forth by specific reference in such filing.

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: October 15, 2025 | By: /s/ Robert G Butterfield
| Robert G Butterfield
| Executive Vice President, Treasurer and Chief Financial Officer