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Delaware ( State or other jurisdiction of incorporation or organization ) ( Mark One ) 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 " TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( D ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 1545 Courtney Ave. Los Angeles , CA ( Address of principal executive offices ) FORM 10 - K Tailwind Acquisition Corp. ( Exact name of registrant as specified in its charter ) 001-39489 ( Commission File Number ) Title of Each Class : Units , each consisting of one share of Class A common stock , 0.0001 par value , and one half of one warrant Class A common stock included as part of the units Redeemable warrants included as part of the units , each whole warrant exercisable for one share of Class A common stock at an exercise price of 11.50 Large accelerated filer Non - accelerated filer 90046 ( Zip Code ) Registrant's telephone number , including area code : ( 646 ) 432-0610 Not Applicable ( Former name or former address , if changed since last report ) Securities registered pursuant to Section 12 ( b ) of the Act : X Trading Symbol : TWND.U TWND 85-1288435 ( I.R.S. Employer Identification Number ) TWND WS Name of Each Exchange on Which Registered : The New York Stock Exchange The New York Stock Exchange 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 Exchange Act . Yes ¨ No x The New York Stock Exchange 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 ¨ 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 and post 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 . Accelerated filer Smaller reporting company Emerging growth company X X