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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 , 2020 □ 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 of Incorporation or Organization ) 20-4729288 ( I.R.S. Employer Identification No. ) 31 East Fourth Street , Dunkirk , NY 14048 ( Address of Principal Executive Offices , including zip code ) ( 716 ) 366-4070 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Exchange Act : Title of each class Common stock , par value $ 0.01 per share Trading Symbol ( s ) LSBK Securities registered pursuant to Section 12 ( g ) of the Act : None . Name of each exchange on which registered The Nasdaq Stock Market LLC Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes [ ] No [ X ] Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes [ ] No [ X ] Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes ( ✗ ] No [ ] Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( $ 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes [ X ] No [ ] Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company or an emerging growth company . See definition of “ large accelerated filer , ” “ accelerated filer , ” “ smaller reporting company ” and “ emerging growth company ” in Rule 12b - 2 of the Exchange Act . Large accelerated filer ☐ Non - accelerated filer Emerging growth company ☐ Accelerated filer Smaller reporting company ☑