Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Trundle Stephen
   2. Issuer Name and Ticker or Trading Symbol
Alarm.com Holdings, Inc. [ALRM] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
President and CEO
(Last)
(First)
(Middle)
C/O ALARM.COM HOLDINGS, INC., 8281 GREENSBORO DRIVE SUITE 100		 3. Date of Earliest Transaction (Month/Day/Year)
03/15/2018
(Street)

TYSONS, VA 22102		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 03/15/2018   M   5,000 A $ 3.89 167,191 D  
Common Stock 03/15/2018   S(1)   5,000 D $ 39.8 162,191 D  
Common Stock 03/15/2018   M   2,500 A $ 21.7 164,691 D  
Common Stock 03/16/2018   M   20,000 A $ 3.89 184,691 D  
Common Stock 03/16/2018   S(1)   20,000 D $ 38.94 (2) 164,691 D  
Common Stock               130,118 I By Trust (3)
Common Stock               204,642 I By Trust (4)
Common Stock               2,141,235 I By LLC (5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (Right to Buy) $ 3.89 03/15/2018   M     5,000   (6) 07/11/2022 Common Stock 5,000 $ 0 72,193 D  
Stock Option (Right to Buy) $ 21.7 03/15/2018   M     2,500   (7) 05/14/2026 Common Stock 2,500 $ 0 47,500 D  
Stock Option (Right to Buy) $ 3.89 03/16/2018   M     20,000   (6) 07/11/2022 Common Stock 20,000 $ 0 52,193 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Trundle Stephen
C/O ALARM.COM HOLDINGS, INC.
8281 GREENSBORO DRIVE SUITE 100
TYSONS, VA 22102		   X     President and CEO  

Signatures

 /s/ Daniel Ramos, Attorney-in-Fact   03/19/2018
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) These sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.
(2) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.90 - $38.97, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.
(3) These shares are owned by the Stephen Trundle 2015 Gift Trust (the "Trust"). Certain members of the Reporting Person's immediate family are beneficiaries of the Trust. The Reporting Person disclaims beneficial ownership of the shares owned by the Trust except to the extent, if any, of his pecuniary interest therein.
(4) These shares are owned by the Stephen Trundle 2015 4 Year GRAT (the "4 Year GRAT"). The Reporting Person is the sole trustee and primary beneficiary of the 4 Year GRAT.
(5) These shares are owned by Backbone Partners, LLC ("Backbone"). The Reporting Person has the sole power to vote and dispose of the shares held by Backbone. The Reporting Person disclaims beneficial ownership of the shares owned by Backbone except to the extent, if any, of his pecuniary interest therein.
(6) Immediately exercisable.
(7) This option is immediately exercisable. Twenty percent (20%) of the shares subject to this option vested on May 15, 2017 and the balance of the shares vest in a series of forty-eight (48) successive equal monthly installments beginning on June 1, 2017, subject to the Reporting Person's continuous service with the Company through each vesting date.

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