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 *

Bakas Michael T
2. Issuer Name and Ticker or Trading Symbol

Ameresco, Inc. [ AMRC ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
Executive Vice President
(Last)          (First)          (Middle)

C/O AMERESCO, INC., 111 SPEEN STREET, SUITE 410
3. Date of Earliest Transaction (MM/DD/YYYY)

9/1/2021
(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 9/1/2021  M  16551 A$4.64 16551 D  
Class A Common Stock 9/1/2021  M  5000 A$8.35 21551 D  
Class A Common Stock 9/1/2021  M  5000 A$5.80 26551 D  
Class A Common Stock 9/1/2021  S  21889 D$69.06 (1)4662 D  
Class A Common Stock 9/1/2021  S  4662 D$68.159 (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 Security3. Trans. Date3A. Deemed Execution Date, if any4. 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 Date7. 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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option (right to purchase) $4.64 9/1/2021  M     16551  3/22/2019 5/9/2026 Class A Common Stock 16551.0 $0 650 D  
Stock Option (right to purchase) $8.35 9/1/2021  M     5000   (3)2/1/2028 Class A Common Stock 5000.0 $0 20000 D  
Stock Option (right to purchase) $5.8 9/1/2021  M     5000   (4)3/8/2027 Class A Common Stock 5000.0 $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 $68.51 to $69.47, 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 $67.92 to $68.40, inclusive.
(3) Of the shares subject to the option, 20% vest on February 2, 2019, and the remainder vest in four equal installments on each of the subsequent four anniversaries of such date.
(4) Of the shares subject to the option, 20% vest on March 9, 2018, and the remainder vest in four equal installments on each of the subsequent four anniversaries of such date.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Bakas Michael T
C/O AMERESCO, INC.
111 SPEEN STREET, SUITE 410
FRAMINGHAM, MA 01701


Executive Vice President

Signatures
/s/ David J. Corrsin, attorney-in-fact9/2/2021
**Signature of Reporting PersonDate

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