UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 Commission file number 1-35015 ACNB CORPORATION (Exact name of Registrant as specified in its charter) Pennsylvania 23-2233457 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.) 16 Lincoln Square, Gettysburg, Pennsylvania 17325 (Address ...

Use these links to rapidly review the document Table of Contents ITEM 8—FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA Title of each class Trading Symbol Name of each exchange on which registered Common Stock, $2.50 par value per share ACNB The NASDAQ Stock Market, LLC Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-K (Mark One) ý ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year-ended December 31, 2019 OR o ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 Commission file number 1-35015 ACNB CORPORATION (Exact name of Registrant as specified in its charter) Pennsylvania 23-2233457 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.) 16 Lincoln Square, Gettysburg, Pennsylvania 17325 (Add ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 Commission file number 1-35015 ACNB CORPORATION (Exact name of Registrant as specified in its charter) Pennsylvania 23-2233457 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.) 16 Lincoln Square, Gettysburg, Pennsylvania 17325 (Address ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 Commission file number 1-35015 ACNB CORPORATION (Exact name of Registrant as specified in its charter) Pennsylvania 23-2233457 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.) 16 Lincoln Square, Gettysburg, Pennsylvania 17325 (Address ...

Use these links to rapidly review the document Table of Contents ITEM 8—FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-K (Mark One) ý ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year-ended December 31, 2018 OR o TRANSACTION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-35 ...