# EDGAR Filing Document

**Accession Number:** 0001496596
**File Stem:** 0001628280-26-017478
**Filing Date:** 2026-3
**Character Count:** 7643
**Document Hash:** 13f003eff2de6bd3b22aff541bc51fda
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001628280-26-017478.hdr.sgml**: 20260312

**ACCESSION NUMBER**: 0001628280-26-017478

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260310

**FILED AS OF DATE**: 20260312

**DATE AS OF CHANGE**: 20260312

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Corrsin David J
- **CENTRAL INDEX KEY:** 0001496596

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-34811
- **FILM NUMBER:** 26749748

**MAIL ADDRESS:**
- **STREET 1:** 411 SPEEN STREET
- **STREET 2:** SUITE 410
- **CITY:** FRAMINGHAM
- **STATE:** MA
- **ZIP:** 01701
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Ameresco, Inc.
- **CENTRAL INDEX KEY:** 0001488139
- **STANDARD INDUSTRIAL CLASSIFICATION:** CONSTRUCTION SPECIAL TRADE CONTRACTORS [1700]
- **ORGANIZATION NAME:** 05 Real Estate & Construction
- **EIN:** 043512838
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 111 SPEEN STREET
- **CITY:** FRAMINGHAM
- **STATE:** MA
- **ZIP:** 01701
- **BUSINESS PHONE:** 508-661-2200

**MAIL ADDRESS:**
- **STREET 1:** 111 SPEEN STREET
- **CITY:** FRAMINGHAM
- **STATE:** MA
- **ZIP:** 01701

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[x] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Corrsin David J<br><sub>(Last) (First) (Middle)</sub><br>C/O AMERESCO, INC.<br>111 SPEEN STREET, SUITE 410<br><sub>(Street)</sub><br>FRAMINGHAM, MA 01701<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-03-10 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_EVP and General Counsel_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Ameresco, Inc. [ AMRC ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Class A Common Stock | 2026-03-10 |  | M |  | 50 | A | $0 | 460<sup>(1)</sup> | I | By Spouse<sup>(2)</sup> |
| Class A Common Stock | 2026-03-12 |  | S |  | 19 | D | 25.31<sup>(3)</sup> | 441 | I | By Spouse<sup>(2)</sup> |
| Class A Common Stock |  |  |  |  |  |  |  | 20471 | D |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Stock Option (right to purchase) | $26.36 | 2026-03-10 |  | A |  | 20000 |  | <sup>(4)</sup> | <sup>(4)</sup> | Class A Common Stock | 20000 | $0 | 20000 | D |  |
| Restricted Stock Unit | <sup>(5)</sup> | 2026-03-10 |  | A |  | 3500 |  | <sup>(6)</sup> | <sup>(6)</sup> | Class A Common Stock | 3500 | $0 | 3500 | D |  |
| Stock Option (right to purchase) | $26.36 | 2026-03-10 |  | A |  | 4000 |  | <sup>(4)</sup> | <sup>(4)</sup> | Class A Common Stock | 4000 | $0 | 4000 | I | By spouse<sup>(2)</sup> |
| Restricted Stock Unit | <sup>(5)</sup> | 2026-03-10 |  | A |  | 350 |  | <sup>(6)</sup> | <sup>(6)</sup> | Class A Common Stock | 350 | $0 | 500 | I | By spouse<sup>(2)</sup> |
| Restricted Stock Unit | <sup>(5)</sup> | 2026-03-10 |  | M |  |  | 50 | <sup>(6)</sup> | <sup>(6)</sup> | Class A Common Stock | 50 | $0 | 450 | I | By spouse<sup>(2)</sup> |

---

### Footnotes:

(1) The shares held following the transaction reflect a correction to a clerical error in the Form 4 filed for the March 8, 2026 RSU vesting. That filing incorrectly reported 50 shares sold under an automatic sell-to-cover instruction; the correct number of shares sold was 19.

(2) 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.

(3) 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.

(4) 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.

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

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

**Signature:** David J. Corrsin  
**Date:** 2026-03-12

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**