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UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 or 15 ( d ) of THE SECURITIES AND EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 RESEARCH FRONTIERS INCORPORATED ( Exact name of registrant as specified in its charter ) DELAWARE ( State or other jurisdiction of incorporation or organization ) 240 CROSSWAYS PARK DRIVE WOODBURY , NEW YORK ( Address of principal executive offices ) Securities registered pursuant to Section 12 ( b ) of the Act : Title of Class Common Stock , $ 0.0001 Par Value Commission File Number 000-14893 Registrant's telephone number , including area code ( 516 ) 364-1902 11-2103466 ( I.R.S. Employer Identification No. ) 11797-2033 ( Zip Code ) 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 [ 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 [ X ] No [ ] Large accelerated filer [ ] Smaller reporting company [ X ] Name of Exchange on Which Registered The NASDAQ Stock Market Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site , if any , every Interactive Data File required to be submitted and posted 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 and post such files ) . Yes [ X ] No [ ] Accelerated filer [ ] Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S - K is not contained herein , and will not be contained , to the best of registrant's knowledge , in definitive proxy or information statements incorporated by reference in Part III of this Form 10 - K or any amendment to this Form 10 - K . [ X ] Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , 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 12b - 2 of the Exchange Act . ( Check one ) : 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 is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes [ ] No [ X ] The aggregate market value of the voting and non - voting common equity held by non - affiliates of the registrant as of June 30 , 2020 ( the last business day of the registrant's most recently completed second fiscal quarter ) , computed based on the closing sale price of $ 4.06 was $ 101,397,136 . In making this computation , all direct and indirect shares known to be owned by directors and executive officers of the