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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): November 10, 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 7.01 Regulation FD Disclosure
ACNB Corporation (the “Company”) is furnishing an Investor Presentation that the Company will present, in whole or in part, to investors and analysts from time to time on or after November 10, 2025. A copy of the Investor Presentation is attached hereto as Exhibit 99.1, and will also be made available on the Corporation’s website at investor.acnb.com.
The information in this Item 7.01 of this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, is being furnished and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that Section, nor shall it be deemed subject to the requirements of amended Item 10 of Regulation S-K, nor shall it be deemed incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, whether made before or after the date hereof, regardless of any general incorporation language in such filing. The furnishing of this information hereby shall not be deemed an admission as to the materiality of any such information.
ITEM 9.01 Financial Statements and Exhibits
(d) Exhibits.
Exhibit Number Description
99.1 ACNB Corporation Investor Presentation dated November 10, 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: | November 10, 2025 |  | /s/ Kevin J. Hayes
|  | Kevin J. Hayes
|  | Senior Vice President/
|  | General Counsel, Secretary & Chief Governance Officer