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SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K [ X ] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 Commission file number : 001-36271 WATERSTONE FINANCIAL , INC . Maryland ( Exact name of registrant as specified in its charter ) ( State or other jurisdiction of incorporation or organization ) 11200 W Plank Ct , Wauwatosa , Wisconsin ( Address of principal executive offices ) 90-1026709 ( I.R.S. Employer Identification No. ) 53226 ( Zip Code ) Title of each class Common Stock , $ 0.01 Par Value ( 414 ) 761-1000 Registrant's telephone number , including area code : Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol WSBF Name of each exchange on which registered The NASDAQ Stock Market LLC Securities registered pursuant to Section 12 ( g ) of the Act : NONE Indicate by check mark whether the registrant is a well - known seasoned issuer ( as defined in Rule 405 of the 1933 Act ) . Yes ☐ No T Indicate by check mark whether the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the 1934 Act . Yes ◎ No T 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 T No ㅁ 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 during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) Yes T 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 definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Large accelerated filer Emerging growth company ☐ ☐ Accelerated filer ☑ Non - accelerated filer ☐ Smaller Reporting 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 . o Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . T Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 under the Exchange Act ) . Yes ☐ No T The aggregate market value of the voting and non - voting common equity held by non - affiliates of the Registrant , computed by reference to the price at which the common equity was last sold on June 30 , 2020 as reported by the NASDAQ Global Select MarketⓇ , was approximately $ 383.3 million . As of February 26 , 2021 , 25,117,634 shares of the Registrant's Common Stock were issued and outstanding . DOCUMENTS INCORPORATED BY REFERENCE Document Proxy Statement for Annual Meeting of Shareholders on May 18 , 2021 Part of Form 10 - K Into Which Portions of Document are Incorporated Part III