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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 ( 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 1934 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF FORM 10 - K For the transition period from Cayman Islands ( State or other jurisdiction of incorporation or organization ) OR Altimar Acquisition Corporation ( Exact name of Registrant as specified in its Charter ) Title of each class Units , each consisting of one share of Class A Ordinary share , $ 0.0001 par value , and one - third of one redeemable warrant Class A Ordinary Shares included as part of the units Redeemable warrants included as part of the units , each whole warrant exercisable for one Class A Ordinary Share at an exercise price of $ 11.50 Commission File Number 001-39653 to 40 West 57th Street 33rd Floor New York , NY 10019 ( Address of principal executive offices and zip code ) Registrant's telephone number , including area code : ( 212 ) 287-6767 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) ATAC.U ATAC ATAC.W Securities registered pursuant to Section 12 ( g ) of the Act : None 98-1554235 ( I.R.S. Employer Identification No. ) Name of each exchange on which registered New York Stock Exchange New York Stock Exchange New York Stock Exchange 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 15 ( d ) of the Act . YES □ NO >