FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF 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 *   GAGNON NEIL 2. Date of Event Requiring Statement (Month/Day/Year) 10/30/2015 3. Issuer Name and Ticker or Trading Symbol Ameresco, Inc. [AMRC] (Last) (First) (Middle) 1370 AVENUE OF THE AMERICAS, 24TH FLOOR 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) NEW YORK, NY 10019 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 Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Class A Common Stock, $0.0001 par value per share 488,082 (1) D   Class A Common Stock, $0.0001 par value per share 1,055,979 I By Managing Member as General Partner of Gagnon Investment Associates Class A Common Stock, $0.0001 par value per share 93,746 I By Limited Partner of the Family Partnership Class A Common Stock, $0.0001 par value per share 93,106 I By Managing Member as General Partner of Darwin Partnership Class A Common Stock, $0.0001 par value per share 15,941 I By Neil Gagnon as Trustee of Gagnon Securities LLC Profit Sharing Plan

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
GAGNON NEIL 1370 AVENUE OF THE AMERICAS 24TH FLOOR NEW YORK, NY 10019	Â	  X	Â	Â

Signatures

/s/ Neil Gagnon		11/04/2015
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(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)	Neil Gagnon serves as the Chief Executive Officer of Gagnon Advisors, LLC and is the managing member and owner of Gagnon Securities LLC, each of which provide investment management services to investment vehicles and managed accounts (collectively, the "Accounts"), and as such, has investment discretion with respect to the Accounts. For the purposes of Rule 13d-3, Mr. Gagnon is deemed to beneficially own 1,746,854 shares of common stock of Ameresco, Inc. Mr. Gagnon's interest in the securities reported herein is limited to the extent of his pecuniary interest in each of the Accounts, if any.

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