X0306 4 2021-06-01 0 0001459200 Alarm.com Holdings, Inc. ALRM 0001304655 Valenzuela Steve C/O ALARM.COM HOLDINGS, INC. 8281 GREENSBORO DRIVE, SUITE 100 TYSONS VA 22102 0 1 0 0 Chief Financial Officer Common Stock 2021-06-01 4 M 0 1083 27.90 A 42177 D Common Stock 2021-06-01 4 M 0 208 37.94 A 42385 D Common Stock 2021-06-01 4 S 0 1291 82.07 D 41094 D Employee Stock Option (Right to Buy) 27.90 2021-06-01 4 M 0 1083 0.00 D 2026-11-14 Common Stock 1083 5417 D Employee Stock Option (Right to Buy) 37.94 2021-06-01 4 M 0 208 0.00 D 2030-03-31 Common Stock 208 9584 D These exercises and subsequent sale were effected pursuant to a Rule 10b5-1 Trading Plan adopted by the Reporting Person on August 21, 2020. The shares underlying the option exercised in this transaction were fully vested and exercisable. The remainder of the shares underlying the option shall continue to vest and become exercisable ratably on a monthly basis on the first day of each month through November 1, 2021, subject to the Reporting Person's continued service with the Issuer through each such date. The shares underlying the option exercised in this transaction were fully vested and exercisable. The remainder of the shares underlying the option shall continue to vest and become exercisable ratably on a monthly basis on the first day of each month through April 1, 2025, subject to the Reporting Person's continued service with the Issuer through each such date. /s/ Daniel Ramos, Attorney-in-Fact 2021-06-03