As of November 6, 2026, 4 holders' latest Schedule 13D or 13G filings report owning 5% or more of Ameresco, Inc. The largest reported stake is Wellington Management Group LLP's, at 10.2%. 15 filings are on record since July 16, 2025 (Schedule 13G/A, May 15, 2026).
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Key facts
- · Reporting person: Millennium Management LLC · Sole voting: 0 · Shared voting: 29,686 · Sole dispositive: 0 · Shared dispositive: 29,686 · SCHEDULE 13G/A, 2026-10-13
- · Reporting person: Dimensional Fund Advisors LP · Sole voting: 1,781,722 · Shared voting: 0 · Sole dispositive: 1,815,018 · Shared dispositive: 0 · SCHEDULE 13G, 2026-10-08
- · Reporting person: Gagnon Securities LLC · Sole voting: 0 · Shared voting: 951,125 · Sole dispositive: 0 · Shared dispositive: 999,794 · SCHEDULE 13G, 2026-08-27
- · Holder: Millennium Management LLC · Percent: 5.2% · SCHEDULE 13G
- · Holder: Wellington Management Group LLP · Percent: 10.2% · SCHEDULE 13G/A
Ameresco, Inc. has 15 Schedule 13D or 13G filings on record since 2025-07-16. 4 holders' latest filing reports 5% or more of class a common stock, par value $0.0001 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Wellington Management Group LLP | 10.2% | 3,541,577 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 |
| Grantham, Mayo, Van Otterloo & Co. LLC | 6.67% | 2,323,792 | SCHEDULE 13G/A, 2026-02-10 | 2025-12-31 |
| Dimensional Fund Advisors LP | 5.2% | 1,815,018 | SCHEDULE 13G, 2026-10-08 | 2026-09-30 |
| 5% | 1,762,866 | SCHEDULE 13G, 2026-08-27 | 2026-08-20 | |
| First Trust Portfolios L.P. | 0.78% | 270,136 | SCHEDULE 13G/A, 2025-10-31 | 2025-09-30 |
| Millennium Management LLC | 0.1% | 29,686 | SCHEDULE 13G/A, 2026-10-13 | 2026-09-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
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More on Ameresco, Inc. and the records around it.
Ameresco, Inc. elsewhere on the record
- Leadership changes Sep 2026
- Who owns it
Companies that share a holder
- Gagnon Securities LLC also filed stake reports on 4 other companies: CNFinance Holdings Ltd. (Nov 2026), Kaltura, Inc. (Aug 2026), CareDx, Inc. (Aug 2026)
- Grantham, Mayo, Van Otterloo & Co. LLC also filed stake reports on 6 other companies: Array Technologies Inc (Nov 2026), Clean Energy Fuels Corp (Aug 2026), Kosmos Energy Ltd (May 2026)
- First Trust Portfolios L.P. also filed stake reports on 105 other companies: First Trust Exchange-Traded Fund (Nov 2026), First Trust Exchange-Traded Fund IV (Nov 2026), First Trust Exchange-Traded Fund VIII (Nov 2026)
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What the Full Report on Ameresco, Inc. covers
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Dimensional Fund Advisors LP | 1,781,722 | 0 | 1,815,018 | 0 | SCHEDULE 13G, 2026-10-08 |
| Gagnon Securities LLC | 0 | 951,125 | 0 | 999,794 | SCHEDULE 13G, 2026-08-27 |
| Gagnon Advisors, LLC | 0 | 472,798 | 0 | 472,798 | SCHEDULE 13G, 2026-08-27 |
| Neil Gagnon | 153,541 | 1,551,948 | 153,541 | 1,609,325 | SCHEDULE 13G, 2026-08-27 |
| Millennium Management LLC | 0 | 29,686 | 0 | 29,686 | SCHEDULE 13G/A, 2026-10-13 |
| Millennium Group Management LLC | 0 | 29,686 | 0 | 29,686 | SCHEDULE 13G/A, 2026-10-13 |
| Israel A. Englander | 0 | 29,686 | 0 | 29,686 | SCHEDULE 13G/A, 2026-10-13 |
The latest filing identifies Ameresco, Inc. by CUSIP 02361E108 and gives its principal executive office as 111 Speen Street, Suite 410, Framingham, MA 01701 (SCHEDULE 13G/A, 2026-10-13).
What the percentages are based on
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.Neil Gagnon, SCHEDULE 13G, 2026-08-27
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-16 | First Trust Portfolios L.P. | 5.41% | SCHEDULE 13G |
| 2025-08-12 | Wellington Management Group LLP | 5.1% | SCHEDULE 13G |
| 2025-09-08 | Wellington Management Group LLP | 11.1% | SCHEDULE 13G/A |
| 2025-10-24 | Neil Gagnon | 4.9% | SCHEDULE 13G/A |
| 2025-10-31 | First Trust Portfolios L.P. | 0.78% | SCHEDULE 13G/A |
| 2025-11-05 | Grantham, Mayo, Van Otterloo & Co. LLC | 9.23% | SCHEDULE 13G/A |
| 2025-11-12 | Wellington Management Group LLP | 13.6% | SCHEDULE 13G/A |
| 2026-02-10 | Wellington Management Group LLP | 11.2% | SCHEDULE 13G/A |
| 2026-02-10 | Grantham, Mayo, Van Otterloo & Co. LLC | 6.67% | SCHEDULE 13G/A |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-05-15 | Wellington Management Group LLP | 10.2% | SCHEDULE 13G/A |
| 2026-07-22 | Millennium Management LLC | 5.2% | SCHEDULE 13G |
| 2026-08-27 | Neil Gagnon | 5% | SCHEDULE 13G |
| 2026-10-08 | Dimensional Fund Advisors LP | 5.2% | SCHEDULE 13G |
| 2026-10-13 | Millennium Management LLC | 0.1% | SCHEDULE 13G/A |
Questions about who owns Ameresco, Inc.
Who owns Ameresco, Inc.?
On this page, 4 holders' latest ownership filings report 5% or more of Ameresco, Inc.: Wellington Management Group LLP (10.2%, Schedule 13G/A, filed 2026-05-15), Grantham, Mayo, Van Otterloo & Co. LLC (6.67%, Schedule 13G/A, filed 2026-02-10), Dimensional Fund Advisors LP (5.2%, Schedule 13G, filed 2026-10-08) and Neil Gagnon (5%, Schedule 13G, filed 2026-08-27).
Who are the largest shareholders of Ameresco, Inc.?
By the share each holder's latest filing reports, the largest holders of Ameresco, Inc. on this page are Wellington Management Group LLP (10.2%), Grantham, Mayo, Van Otterloo & Co. LLC (6.67%) and Dimensional Fund Advisors LP (5.2%).
When did Wellington Management Group LLP buy into Ameresco, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Wellington Management Group LLP on this page is the Schedule 13G, filed 2025-08-12, reporting 5.1%; its latest, Schedule 13G/A filed 2026-05-15, reports 10.2%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 15 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Also on the record for Ameresco, Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| September 10, 2026 | Leadership change: Julie Bradshaw appointed, Vice President, Finance | — | Leadership changes | Source |
| August 19, 2026 | Leadership change: David J. Corrsin departs, Director | — | Leadership changes | Source |
| August 19, 2026 | Leadership change: Mark A. Chiplock departs, Chief Financial Officer and Chief Accounting Officer | — | Leadership changes | Source |
| July 27, 2026 | Leadership change: Brian Cox appointed, Director | — | Leadership changes | Source |
| March 31, 2026 | Leadership change: Nicole A. Bulgarino appointed, Chief Operating Officer | — | Leadership changes | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.