AMRC

Annual grant pursuant to Ameresco, Inc.'s non-employee director compensaiton plan.

Each RSU represents a contingent right to receive one share of Ameresco, Inc. Class A Common Stock ("Common Stock").

The RSUs vest in full on the first anniversary of the grant date, assuming continues service through the vesting date.

Annual grant pursuant to Ameresco, Inc.'s non-employee director compensaiton plan.

Each RSU represents a contingent right to receive one share of Ameresco, Inc. Class A Common Stock ("Common Stock").

The RSUs vest in full on the first anniversary of the grant date, assuming continues service through the vesting date.

Annual grant pursuant to Ameresco, Inc.'s non-employee director compensaiton plan.

Each RSU represents a contingent right to receive one share of Ameresco, Inc. Class A Common Stock ("Common Stock").

The RSUs vest in full on the first anniversary of the grant date, assuming continues service through the vesting date.

Annual grant pursuant to Ameresco, Inc.'s non-employee director compensaiton plan.

Each RSU represents a contingent right to receive one share of Ameresco, Inc. Class A Common Stock ("Common Stock").

The RSUs vest in full on the first anniversary of the grant date, assuming continues service through the vesting date.

Annual grant pursuant to Ameresco, Inc.'s non-employee director compensation plan.

Each RSU represents a contingent right to receive one share of Ameresco, Inc. Class A Common Stock ("Common Stock").

The RSUs vest in full on the first anniversary of the grant date, assuming continues service through the vesting date.

Annual grant pursuant to Ameresco, Inc.'s non-employee director compensaiton plan.

Each RSU represents a contingent right to receive one share of Ameresco, Inc. Class A Common Stock ("Common Stock").

The RSUs vest in full on the first anniversary of the grant date, assuming continues service through the vesting date.

Annual grant pursuant to Ameresco, Inc.'s non-employee director compensaiton plan.

Each RSU represents a contingent right to receive one share of Ameresco, Inc. Class A Common Stock ("Common Stock").

The RSUs vest in full on the first anniversary of the grant date, assuming continues service through the vesting date.

Annual grant pursuant to Ameresco, Inc.'s non-employee director compensation plan.

Each RSU represents a contingent right to receive one share of Ameresco, Inc. Class A Common Stock ("Common Stock").

The RSUs vest in full on the first anniversary of the grant date, assuming continues service through the vesting date.

Annual grant pursuant to Ameresco, Inc.'s non-employee director compensaiton plan.

Each RSU represents a contingent right to receive one share of Ameresco, Inc. Class A Common Stock ("Common Stock").

The RSUs vest in full on the first anniversary of the grant date, assuming continues service through the vesting date.

Annual grant pursuant to Ameresco, Inc.'s non-employee director compensaiton plan.

Each RSU represents a contingent right to receive one share of Ameresco, Inc. Class A Common Stock ("Common Stock").

The RSUs vest in full on the first anniversary of the grant date, assuming continues service through the vesting date.

Annual grant pursuant to Ameresco, Inc.'s non-employee director compensaiton plan.

Each RSU represents a contingent right to receive one share of Ameresco, Inc. Class A Common Stock ("Common Stock").

The RSUs vest in full on the first anniversary of the grant date, assuming continues service through the vesting date.

The shares subject to the option vest fully upon the earlier of (a) the company achieving adjusted EBITDA of at least $100 million or (b) the three year anniversary of the grant.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.21 to $30.45, 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 to this Form 4.

Of the shares subject to the option, 20% vest on each of anniversary of the grant date of May 18, 2026 over a period of five years.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 6, 2024.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.44 to $33.26 , 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 2 and 3 to this Form 4.

Of the shares subject to the option, 20% vest on each of anniversary of the grant date of May 18, 2026 over a period of five years.

Of the shares subject to the option, 20% vest on each of anniversary of the grant date of May 18, 2026 over a period of five years.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 6, 2024.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.57 to $32.43, inclusive.

Of the shares subject to the option, 20% vest on May 26, 2017, and the remainder vest in four equal installments on each of the subsequent four anniversaries of such date.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 8, 2025.

Of the shares subject to the option, 20% vest on April 24, 2020, and the remainder vest in four equal installments on each of the subsequent four anniversaries of such date.

Of the shares subject to the option, 20% vest on May 26, 2017, and the remainder vest in four equal installments on each of the subsequent four anniversaries of such date.

The shares were sold pursuant to an automatic sell-to-cover instruction signed September 5, 2025 solely to cover applicable withholding taxes in connection with the vesting of RSUs.

The shares were sold pursuant to an automatic sell-to-cover instruction signed March 7, 2023 solely to cover applicable withholding taxes in connection with the vesting of RSUs.

The shares were sold pursuant to an automatic sell-to-cover instruction signed March 8, 2023 solely to cover applicable withholding taxes in connection with the vesting of RSUs.

The reporting person disclaims beneficial ownership of the shares held by his spouse, and this report should not be deemed an admission that the reporting person is the beneficial owner of his spouse's shares for purposes of Section 16 or for any other purpose.

Each RSU represents a contingent right to receive one share of Ameresco, Inc. Class A Common Stock ("Common Stock").

Each RSU vests over two years with 25% vesting on each 6-month anniversary of the applicable grant date.

Each RSU represents a contingent right to receive one share of Ameresco, Inc. Class A Common Stock ("Common Stock").

Each RSU vests over two years with 25% vesting on each 6-month anniversary of the applicable grant date.

Of the shares subject to the option, 20% vest on each of anniversary of the grant date of March 10, 2026 over a period of five years.

Each RSU represents a contingent right to receive one share of Ameresco, Inc. Class A Common Stock ("Common Stock").

Each RSUs represents a contingent right to receive one share of Common Stock and vest over two years with 25% vesting on each 6-month anniversary of the applicable grant date.

Of the shares subject to the option, 20% vest on each of anniversary of the grant date of March 10, 2026 over a period of five years.

Of the shares subject to the option, 20% vest on each of anniversary of the grant date of March 10, 2026 over a period of five years.

Each RSU represents a contingent right to receive one share of Ameresco, Inc. Class A Common Stock ("Common Stock").

Each RSU vests over two years with 25% vesting on each 6-month anniversary of the applicable grant date.

Each RSU represents a contingent right to receive one share of Ameresco, Inc. Class A Common Stock ("Common Stock").

Each RSU vests over two years with 25% vesting on each 6-month anniversary of the applicable grant date.

The reporting person disclaims beneficial ownership of the shares held by his spouse, and this report should not be deemed an admission that the reporting person is the beneficial owner of his spouse's shares for purposes of Section 16 or for any other purpose.

Each RSU represents a contingent right to receive one share of Ameresco, Inc. Class A Common Stock ("Common Stock").

Each RSU vests over two years with 25% vesting on each 6-month anniversary of the applicable grant date.

Each RSU represents a contingent right to receive one share of Ameresco, Inc. Class A Common Stock ("Common Stock").

Each RSU vests over two years with 25% vesting on each 6-month anniversary of the applicable grant date.