X0203 3 2010-07-21 0 0001488139 Ameresco, Inc. AMRC 0001496421 Derrington Keith A C/O AMERESCO, INC. 111 SPEEN STREET , SUITE 410 FRAMINGHAM MA 01701 0 1 0 0 Executive Vice President Stock Option (right to purchase) 2.75 2014-06-25 Class A Common Stock 200000 D Stock Option (right to purchase) 3.41 2017-01-24 Class A Common Stock 100000 D Stock Option (right to purchase) 13.05 2020-04-26 Class A Common Stock 200000 D Of the shares subject to the option, 20% vested on June 25, 2005, and the remainder vest in 16 equal quarterly installments thereafter. Of the shares subject to the option, 20% vested on January 24, 2008, and the remainder vest in 16 equal quarterly installments thereafter. Of the shares subject to the option, 20% vest on April 26, 2011, and the remainder vest in 16 equal quarterly installments thereafter. /s/ David J. Corrsin, Attorney-in-fact 2010-07-21