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( Mark One ) 冈 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 FORM 10 - K 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 : 001-37461 Delaware ( State or other jurisdiction of incorporation ) ALARM.COM HOLDINGS , INC . ( Exact name of registrant as specified in its charter ) ALARM.COM®Ⓡ 8281 Greensboro Suite Tysons Virginia Drive 100 ( Address of principal executive offices ) Title of each class Common Stock , $ 0.01 par value per share Tel : ( 877 ) 389-4033 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : 26-4247032 ( IRS Employer Identification No. ) 22102 Trading Symbol ALRM ( Zip Code ) 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 . þ 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 þ 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 . þ Yes " 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 such files ) . p Yes " No