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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 23, 2025
ACNB Corporation
(Exact name of Registrant as specified in its charter)

Pennsylvania |  | 1-35015 |  | 23-2233457
(State or other jurisdiction of incorporation) |  | (Commission File Number) |  | (IRS Employer Identification No.)

16 Lincoln Square, Gettysburg, PA |  | 17325
(Address of principal executive offices) |  | (Zip Code)

| 717.334.3161 |
(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))
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. ☐
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, $2.50 par value per share | ACNB | The NASDAQ Stock Market, LLC

CURRENT REPORT ON FORM 8-K
ITEM 2.02 Results of Operations and Financial Condition
ACNB Corporation released financial results for the three months ended September 30, 2025, as more fully described in the attached press release dated October 23, 2025. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information furnished under this Item 2.02 of this Current Report on Form 8-K shall not be deemed to be filed for purposes of the Securities Exchange Act of 1934.
ITEM 9.01 Financial Statements and Exhibits
(d) Exhibits.
Exhibit Number Description
99.1 ACNB Corporation Press Release dated October 23, 2025.
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 Current Report on Form 8-K to be signed on its behalf by the undersigned, thereunto duly authorized.

|  | ACNB CORPORATION (Registrant)
Dated: | October 23, 2025 |  | /s/ Kevin J. Hayes
|  | Kevin J. Hayes
|  | Senior Vice President/
|  | General Counsel, Secretary & Chief Governance Officer