United States Securities and Exchange Commission Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File No.: 000-51821 Lake Shore Bancorp, Inc. (Exact Name of Registrant as Specified in Its Charter) United States (State or Other Jurisdiction 20-4729288 of Incorporation or Organizati ...