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) 08/29/2017 (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 08/29/2017   M   38,592 A $ 0.41 310,733 D (1)   Common Stock 08/29/2017   S   38,592 D $ 44.94 (2) 272,141 D (1)   Common Stock 08/30/2017   S   29,100 D $ 45.75 (3) 243,041 D (1)   Common Stock 08/31/2017   S   10,850 D $ 44.98 (4) 232,191 D (1)   Common Stock 08/11/2017   G V 140,118 D $ 0 0 I By Trust (5) Common Stock               204,642 I By Trust (6) Common Stock               2,141,235 I By LLC (7)

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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

Employee Stock Option (Right to Buy)

$ 0.41

08/29/2017

M

38,592

(8)

06/30/2019

Common Stock

38,592

$ 0

0

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		08/31/2017
**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)	Includes (i) 44,804 shares previously held by the Stephen Trundle 2015 2 Year GRAT (the "2 Year GRAT"), and (ii) 20,520 shares previously held by the Stephen Trundle 2015 4 Year GRAT (the "4 Year GRAT"), which were distributed to the Reporting Person on August 11, 2017 and are now owned directly.
(2)	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.80 - $45.14, 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 (1) to this Form 4.
(3)	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.41 - $45.92, 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.
(4)	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.95 - $45.05, 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 (3) to this Form 4.
(5)	The Reporting Person had previously contributed 250,000 shares of common stock to the 2 Year GRAT. Upon termination of the 2 Year GRAT on August 11, 2017, 140,118 of the shares were transferred to the Stephen Trundle 2015 Gift Trust. The remaining 109,882 shares were previously distributed to the reporting person and continue to be reported in this Form 4 as directly owned.
(6)	These shares are owned by the 4 Year GRAT. The Reporting Person is the sole trustee and primary beneficiary of the 4 Year GRAT.
(7)	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 those shares owned by Backbone except to the extent of his pecuniary interest therein.
(8)	Immediately exercisable.

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