Transaction Details

Footnotes

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2025. | The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $39.45 to $39.59, 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 this footnote 2 to this Form 4. | The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $39.72 to $39.82, inclusive. | On August 6, 2019, the reporting person was granted an option to purchase 40,000 shares of Class A common stock. The option vested based on continued service to Ameresco, Inc. and performance relative to goals established for the three-year performance period from January 1, 2019 to December 31, 2021. Based on the level of achievement of these goals, as determined by Ameresco, Inc.'s Board of Directors, this option vested as to 36,000 shares.