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
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      
1. Name and Address of Reporting Person * Corrsin David J 2. Issuer Name and Ticker or Trading Symbol Ameresco, Inc. [ AMRC ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable)__X__ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
EVP and General Counsel
(Last)         (First)         (Middle)
C/O AMERESCO, INC., 111 SPEEN STREET, SUITE 410
3. Date of Earliest Transaction (MM/DD/YYYY)
9/2/2021
(Street)
FRAMINGHAM, MA 01701
(City)       (State)       (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)
 
6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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
Class A Common Stock  9/2/2021    M    24401  A $4.64  24401  D   
Class A Common Stock  9/2/2021    S    7156  D $71.58 (1) 17245  D   
Class A Common Stock  9/2/2021    S    17245  D $70.81 (2) 0  D   

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 7. Title and Amount of Securities Underlying Derivative Security
(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 purchase)  $4.64  9/2/2021    M        24401   3/22/2019  5/9/2026  Class A Common Stock  24401.0  $0  20000  D   

Explanation of Responses:
(1)  The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $71.30 to $72.20, inclusive. The reporting person undertakes to provide to Ameresco, Inc., any security holder of Ameresco, Inc., 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 footnotes (1) and (2) to this Form 4.
(2)  The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $70.40 to $71.16, inclusive.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Corrsin David J
C/O AMERESCO, INC.
111 SPEEN STREET, SUITE 410
FRAMINGHAM, MA 01701
X
EVP and General Counsel

Signatures
/s/ David J. Corrsin 9/7/2021
**Signature of Reporting Person Date
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