Page 1

( Mark One ) 冈 ☐ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , DC 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number : 0-422 MIDDLESEX WATER COMPANY ( Exact name of registrant as specified in its charter ) New Jersey ( State of Incorporation ) 22-1114430 ( IRS employer identification no . ) 485C Route 1 South , Suite 400 , Iselin New Jersey 08830 ( Address of principal executive offices , including zip code ) ( 732 ) 634-1500 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Title of Each Class : Common Stock , No Par Value Trading Symbol : MSEX 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 if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes > No □ 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 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 and posted on their corporate web site , if any , every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S - T during the preceding 12 months ( or for such shorter period that the registrants were required to submit and post such files ) . Yes > 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 the definitions of “ large accelerated filer ” , “ accelerated filer ” , “ smaller reporting company " and " emerging growth company " in Rule 12 ( b ) -2 of the Exchange Act . Large accelerated filer Smaller reporting company ☐ Accelerated filer ☐ Non - accelerated filer 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 . 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 . ☑ Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes No The aggregate market value of the voting stock held by non - affiliates of the registrant at June 30 , 2020 was $ 1,152,416,738 based on the closing market price of $ 67.18 per share on the NASDAQ Global Select Market . The number of shares outstanding for each of the registrant's classes of common stock , as of February 25 , 2021 : Common Stock , No par Value 17,474,598 shares outstanding Documents Incorporated by Reference