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hwbk-202601280000893847FALSE132 East High StreetPO Box 688Jefferson CityMissouri6510200008938472026-01-282026-01-28

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): January 28, 2026

Hawthorn Bancshares, Inc. (Exact Name of Registrant as Specified in Charter)

Missouri0-2363643-1626350 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

132 East High Street, PO Box 688, Jefferson City, Missouri 65102 (Address of Principal Executive Offices) (Zip Code)

573-761-6100 (Registrant’s telephone number, including area code)

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 (see General Instruction A.2. below): ☐    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 classTrading Symbol(s)Name of each exchange on which registered Common Stock, $1.00 par valueHWBKThe 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 January 28, 2026, Hawthorn Bancshares, Inc. issued a press release announcing its financial results for the fourth quarter and year ended December 31, 2025. A copy of the press release is attached to this report as Exhibit 99.1. The information set forth in Item 2.02 of this Current Report on Form 8-K, including Exhibit 99.1, is being “furnished” and shall not be deemed “filed” for the purposes of or otherwise subject to liabilities under Section 18 of the Securities Exchange Act of 1934, as amended, and shall not be deemed to be incorporated by reference into the filings of Hawthorn Bancshares, Inc. under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended. Item 8.01 Other Events. On January 28, 2026, Hawthorn Bancshares, Inc. announced that its Board of Directors approved a quarterly cash dividend of $0.21 per common share, an increase of $0.01 per common share, or 5%, from the previous quarterly dividend. The dividend is payable on April 1, 2026 to shareholders of record at the close of business on March 15, 2026. A copy of the press release relating to such announcement is attached to this report as Exhibit 99.2. Item 9.01 Financial Statements and Exhibits.

Exhibit NoDescription

99.1Press release, dated January 28, 2026, issued by Hawthorn Bancshares, Inc. announcing its financial results for the fourth quarter and year ended December 31, 2025.

99.2Press release, dated January 28, 2026, issued by Hawthorn Bancshares, Inc. announcing cash dividends.

104Cover Page Interactive Data File – the cover page XBRL tags are embedded within the Inline XBRL document

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SIGNATURES

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

Dated: January 28, 2026 Hawthorn Bancshares, Inc. By: /s/ Brent M. Giles Name: Brent M. Giles Title: Chief Executive Officer

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