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No No 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 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 : 001-39637 DATTO HOLDING CORP . ( Exact name of registrant as specified in its charter ) Delaware ( State or other jurisdiction of incorporation ) 81-3345706 ( I.R.S. Employer Identification No. ) 101 Merritt 7 Norwalk , CT 06851 ( Address of principal executive offices and Zip Code ) 888-995-1431 ( Registrant's telephone number , including area code ) Title of each class Common Stock , par value $ 0.001 per share Not Applicable ( Former name or former address , if changed since last report . ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) MSP Name of each exchange on which registered 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 o Yes | 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 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