[SCHEDULE 13G/A] Ameresco, Inc. SEC Filing

Rhea-AI Filing Summary

Ameresco (AMRC): Gagnon Securities LLC, Gagnon Advisors, LLC, and Neil Gagnon filed an amended Schedule 13G reporting a passive beneficial stake in Ameresco Class A Common Stock as of the 09/30/2025 event date.

Neil Gagnon reports beneficial ownership of 1,717,344 shares (4.9%), with 153,541 shares held with sole voting and dispositive power and shared voting power over 1,511,094 shares. Gagnon Securities LLC reports 964,139 shares (2.8%) with shared voting power over 920,138 shares. Gagnon Advisors, LLC reports 472,798 shares (1.4%), all with shared voting and dispositive power.

Percentages are based on 34,703,659 shares outstanding as of August 1, 2025. The certification states the securities were not acquired to change or influence control.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Ameresco, Inc.

(Name of Issuer)

Class A Common Stock

(Title of Class of Securities)

02361E108

(CUSIP Number)

09/30/2025

(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)

SCHEDULE 13G

CUSIP No. 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 920,138.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 964,139.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

964,139.00

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)

2.8 %

12

Type of Reporting Person (See Instructions)

BD, IA

SCHEDULE 13G

CUSIP No. 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)

1.4 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

CUSIP No. 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 1,511,094.00
7	Sole Dispositive Power 153,541.00
8	Shared Dispositive Power 1,563,803.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,717,344.00

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)

4.9 %

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 1,511,094 shares of Common Stock and shared dispositive power over 1,563,803 shares of Common Stock. Mr. Gagnon is the managing member 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 920,138 shares of Common Stock held in the Accounts and dispositive power with respect to 964,139 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 Chief Executive Officer 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 No.: 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).
Item 4.	Ownership
(a)	Amount beneficially owned: Gagnon Securities LLC 964,139 Gagnon Advisors, LLC 472,798 Neil Gagnon 1,717,344
(b)	Percent of class: Gagnon Securities LLC 2.8% Gagnon Advisors, LLC 1.4% Neil Gagnon 4.9% Calculation of percentage of beneficial ownership is based on 34,703,659 Common Stock outstanding as of August 1, 2025, based on the Issuer's Form 10-Q filed with the Securities and Exchange Commission on August 5, 2025.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Gagnon Securities LLC 0 Gagnon Advisors, LLC 0 Neil Gagnon 153,541
	(ii) Shared power to vote or to direct the vote: Gagnon Securities LLC 920,138 Gagnon Advisors, LLC 472,798 Neil Gagnon 1,511,094
	(iii) Sole power to dispose or to direct the disposition of: Gagnon Securities LLC 0 Gagnon Advisors, LLC 0 Neil Gagnon 153,541
	(iv) Shared power to dispose or to direct the disposition of: Gagnon Securities LLC 964,139 Gagnon Advisors, LLC 472,798 Neil Gagnon 1,563,803
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	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. [ ] Not Applicable 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 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.

Gagnon Securities LLC

Signature:	/s/ Neil Gagnon
Name/Title:	Neil Gagnon/Managing Member
Date:	10/24/2025

Gagnon Advisors, LLC

Signature:	/s/ Neil Gagnon
Name/Title:	Neil Gagnon/Chief Executive Officer
Date:	10/24/2025

Neil Gagnon

Signature:	/s/ Neil Gagnon
Name/Title:	Neil Gagnon
Date:	10/24/2025

FAQ

What ownership did Neil Gagnon report in AMRC?

Neil Gagnon reported 1,717,344 shares, representing 4.9% of Ameresco Class A Common Stock.

How many shares did Gagnon Securities LLC report for AMRC?

Gagnon Securities LLC reported 964,139 shares, or 2.8% of the class, with shared voting power over 920,138 shares.

What stake did Gagnon Advisors, LLC disclose in AMRC?

Gagnon Advisors, LLC disclosed 472,798 shares, equal to 1.4% of Ameresco’s Class A Common Stock.

What share count was used to calculate the reported percentages for AMRC?

The filing uses 34,703,659 shares outstanding as of August 1, 2025.

Is the Ameresco 13G/A filing passive or active?

The certification states the holdings were not acquired to change or influence control, indicating a passive filing.

What is the event date for the AMRC Schedule 13G/A?

The date of the event requiring the filing is 09/30/2025.

What voting and dispositive powers were reported by Neil Gagnon?

Neil Gagnon has 153,541 shares with sole voting and dispositive power and shared voting power over 1,511,094 shares.