Ameresco, Inc. (AMRC) received a Schedule 13G reporting that investor Neil Gagnon and related advisory entities hold a significant position in the company’s Class A Common Stock. Based on 35,066,211 shares outstanding as of July 31, 2026, Neil Gagnon is reported as beneficially owning 1,762,866 shares, or 5.0% of the class.
Gagnon Securities LLC is reported with beneficial ownership of 999,794 shares (2.9%), and Gagnon Advisors, LLC with 472,798 shares (1.3%). Neil Gagnon has sole voting and dispositive power over 153,541 shares and shared voting and/or dispositive power over additional shares through client accounts and a private fund. The reporting parties state that Gagnon Securities, Gagnon Advisors, and Neil Gagnon expressly disclaim beneficial ownership of securities held in those managed accounts and the fund, which have the economic right to dividends and sale proceeds.
Shares outstanding35,066,211 sharesAmeresco Class A Common Stock outstanding as of July 31, 2026
Neil Gagnon beneficial ownership1,762,866 shares (5.0%)Ameresco Class A Common Stock, based on 35,066,211 shares outstanding
Gagnon Securities LLC beneficial ownership999,794 shares (2.9%)Ameresco Class A Common Stock
Gagnon Advisors, LLC beneficial ownership472,798 shares (1.3%)Ameresco Class A Common Stock
Neil Gagnon sole voting and dispositive power153,541 sharesShares over which Neil Gagnon has sole voting and dispositive power
Neil Gagnon shared voting power1,551,948 sharesAmeresco Class A Common Stock with shared voting power
Neil Gagnon shared dispositive power1,609,325 sharesAmeresco Class A Common Stock with shared dispositive power
Key Terms
beneficial ownership, shared voting power, shared dispositive power, Investment Advisers Act of 1940, +1 more
5 terms
beneficial ownershipfinancial
"Calculation of percentage of beneficial ownership is based on 35,066,211"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.
"an investment adviser registered with the U.S. ("SEC") under the Investment Advisers Act of 1940"
A U.S. federal law that sets rules for people and firms who give investment advice, requiring them to register with regulators, be honest about conflicts, keep records, and follow basic standards of care. It matters to investors because those rules act like licensing and consumer protections — similar to having safety standards for a mechanic — helping ensure advisers act in clients’ financial interests and reducing the risk of fraud or misuse of funds.
Schedule 13Gregulatory
"Calculation of percentage of beneficial ownership is based on 35,066,211"
A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.
FAQ
How much of Ameresco, Inc. (AMRC) stock does Neil Gagnon report owning?
Neil Gagnon reports beneficial ownership of 1,762,866 shares of Ameresco Class A Common Stock, representing 5.0% of the class, based on 35,066,211 shares outstanding as of July 31, 2026.
What Ameresco (AMRC) stake is reported for Gagnon Securities LLC?
Gagnon Securities LLC reports beneficial ownership of 999,794 shares of Ameresco Class A Common Stock, equal to 2.9% of the outstanding class, with shared voting power over 951,125 shares and shared dispositive power over 999,794 shares.
What Ameresco (AMRC) stake is reported for Gagnon Advisors, LLC?
Gagnon Advisors, LLC reports beneficial ownership of 472,798 shares of Ameresco Class A Common Stock, representing 1.3% of the class, with shared voting and shared dispositive power over all 472,798 shares.
How many Ameresco (AMRC) shares outstanding were used to calculate the reported percentages?
The ownership percentages are calculated using 35,066,211 shares of Ameresco Class A Common Stock outstanding as of July 31, 2026, as reported in Ameresco’s Form 10-Q filed on August 4, 2026.
What voting and dispositive powers over Ameresco (AMRC) shares does Neil Gagnon report?
Neil Gagnon reports sole voting and sole dispositive power over 153,541 shares, shared voting power over 1,551,948 shares, and shared dispositive power over 1,609,325 shares of Ameresco Class A Common Stock.
Do the Gagnon entities claim economic ownership of all reported Ameresco (AMRC) shares?
No. Gagnon Securities LLC, Gagnon Advisors, LLC, and Neil Gagnon expressly disclaim beneficial ownership of securities held in client accounts and the private fund, stating those accounts have the right to receive dividends and sale proceeds and, to their knowledge, no such account exceeds 5% of the class.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
Ameresco, Inc.
(Name of Issuer)
Class A Common Stock
(Title of Class of Securities)
02361E108
(CUSIP Number)
08/20/2026
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
02361E108
1
Names of Reporting Persons
Gagnon Securities LLC
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
951,125.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
999,794.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
999,794.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
2.9 %
12
Type of Reporting Person (See Instructions)
BD, IA
SCHEDULE 13G
CUSIP Number(s):
02361E108
1
Names of Reporting Persons
Gagnon Advisors, LLC
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
472,798.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
472,798.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
472,798.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
1.3 %
12
Type of Reporting Person (See Instructions)
IA
SCHEDULE 13G
CUSIP Number(s):
02361E108
1
Names of Reporting Persons
Neil Gagnon
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
153,541.00
6
Shared Voting Power
1,551,948.00
7
Sole Dispositive Power
153,541.00
8
Shared Dispositive Power
1,609,325.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,762,866.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
5.0 %
12
Type of Reporting Person (See Instructions)
IN
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Ameresco, Inc.
(b)
Address of issuer's principal executive offices:
111 Speen Street, Framingham, Massachusetts 01701
Item 2.
(a)
Name of person filing:
Neil Gagnon has sole voting and dispositive power over 153,541 shares of the Issuer's Class A Common Stock (the "Common Stock"). In addition, Mr. Gagnon has shared voting power over 1,551,948 shares of Common Stock and shared dispositive power over 1,609,325 shares of Common Stock.
Mr. Gagnon is the Chief Executive Officer and principal owner of Gagnon Securities LLC ("GS"), an investment adviser registered with the U.S. Securities and Exchange Commission ("SEC") under the Investment Advisers Act of 1940, as amended (the "Advisers Act"), and a registered broker-dealer, in its role as investment manager to several customer accounts, foundations, partnerships and trusts (collectively, the "Accounts") to which it furnishes investment advice. GS and Mr. Gagnon may be deemed to share voting power with respect to 951,125 shares of Common Stock held in the Accounts and dispositive power with respect to 999,794 shares of Common Stock held in the Accounts. GS and Mr. Gagnon expressly disclaim beneficial ownership of all securities held in the Accounts.
Mr. Gagnon is also the managing member of Gagnon Advisors, LLC ("Gagnon Advisors"), an investment adviser registered with the SEC under the Advisers Act. Mr. Gagnon and Gagnon Advisors, in its role as investment manager to Gagnon Investment Associates, LLC ("GIA"), a private investment fund, may be deemed to share voting and dispositive power with respect to the 472,798 shares of Common Stock held by GIA. Gagnon Advisors and Mr. Gagnon expressly disclaim beneficial ownership of all securities held by GIA.
(b)
Address or principal business office or, if none, residence:
1370 Ave. of Americas, 26th Floor, New York, NY 10019
(c)
Citizenship:
Gagnon Securities LLC Delaware limited liability company
Gagnon Advisors, LLC Delaware limited liability company
Neil Gagnon USA
(d)
Title of class of securities:
Class A Common Stock
(e)
CUSIP Number(s):
02361E108
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Gagnon Securities LLC 2.9%
Gagnon Advisors, LLC 1.3%
Neil Gagnon 5.0%
Calculation of percentage of beneficial ownership is based on 35,066,211 Common Stock outstanding as of July 31, 2026, based on the Issuer's Form 10-Q filed with the Securities and Exchange Commission on August 4, 2026.
Ownership of more than 5 Percent on Behalf of Another Person.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
The Accounts described above in Item 2 have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, securities held in their respective accounts. To the knowledge of the Reporting Persons, the interest in any such account does not exceed 5% of the class of securities. Except to the extent described herein, the Reporting Person disclaims beneficial ownership of all such securities.
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
Not Applicable
Item 8.
Identification and Classification of Members of the Group.
Not Applicable
Item 9.
Notice of Dissolution of Group.
Not Applicable
Item 10.
Certifications:
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
