Comparable stake leader
Sakellaris George P.
SEC ownership of Ameresco, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001488139.
Disclosed value leader
Sakellaris George P.
Comparable rows
50/50
Latest evidence
24 Aug 2026
- Public ticker
- AMRC on NYSE
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Sakellaris George P.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Sakellaris George P.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
24 Aug 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001488139
- Issuer location
- Framingham, MA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Ameresco, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Sakellaris George P.
Disclosed value leader
Sakellaris George P.
Comparable rows
50/50
Latest evidence
24 Aug 2026
13D/G
3/4/5
13F
Lead comparable stake: 40%
13D/G row: Sakellaris George P.
Showing 1-8 of 50 holder rows.
Quick read
Sakellaris George P. leads the comparable SEC ownership view at 40%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Sakellaris George P.'s linked filing trail.
Comparable ownership
Top 5
Sakellaris George P.
40%
WELLINGTON MANAGEMENT GROUP LLP
10%
Grantham, Mayo, Van Otterloo & Co...
6.7%
MILLENNIUM MANAGEMENT LLC
5.2%
GAGNON SECURITIES LLC
5%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Sakellaris George P. |
13D/G
3/4/5
Chief Executive Officer, Director, 10%+ Owner
|
40%
|
$208,479,798
20,723,638 shares
|
$0 | 31 Dec 2024 |
| WELLINGTON MANAGEMENT GROUP LLP |
13D/G
13F
Company
|
10%
|
$93,497,633
3,541,577 shares
|
-$9,497,558 | 31 Mar 2026 |
| Grantham, Mayo, Van Otterloo & Co. LLC |
13D/G
13F
Company
|
6.7%
|
$67,994,154
2,323,792 shares
|
-$25,737,125 | 31 Dec 2025 |
| MILLENNIUM MANAGEMENT LLC |
13D/G
13F
Company
|
5.2%
|
$50,126,264
1,816,169 shares
|
$0 | 17 Jul 2026 |
| GAGNON SECURITIES LLC |
13D/G
13F
Neil Gagnon · Company
|
5%
|
$36,420,812
1,762,866 shares
|
+$940,485 | 20 Aug 2026 |
| Neil Gagnon |
13D/G
|
5%
|
$17,486,222
1,738,193 shares
|
$0 | 03 Mar 2025 |
| Handelsbanken Fonder AB |
13F
13D/G
Company
|
4.9%
from 13D/G
|
$23,680,000
857,979 shares
|
— | 30 Jun 2026 |
| FIRST TRUST PORTFOLIOS LP |
13D/G
First Trust Portfolios L.P.
|
0.78%
|
$9,071,167
270,136 shares
|
-$53,793,985 | 30 Sep 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$1,358,053.
Buys
$1,914,610
Insiders: 4
Sells
$3,272,662
Insiders: 6
Net
-$1,358,053
Shares: -8,012
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 81,025
Shares: 89,037
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 81,025 | 0 | $1,914,610 | $0 | +$1,914,610 |
| 3-6 | 0 | 26,953 | $0 | $867,420 | -$867,420 |
| 6-9 | 0 | 16,695 | $0 | $569,614 | -$569,614 |
| 9-12 | 0 | 45,389 | $0 | $1,835,628 | -$1,835,628 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 21 reporting-owner rows connected to Ameresco, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
21
Largest Forms 3/4/5 holder
Sakellaris George P.
Net 12M change
-$1,358,053
Latest report
28 Aug 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Sakellaris George P. | Chief Executive Officer, Director, 10%+ Owner | $58,464,201 | +$574,887 | +0.99% | Mixed | 28 Aug 2026 |
| Joseph W. Sutton | Director | $5,355,332 | +$202,439 | +3.9% | Mixed | 24 Aug 2026 |
| Nicole E. Bulgarino | President - Federal & Utility | $1,770,770 | Mixed | 18 May 2026 | ||
| Brian C. Cox | Director | $959,193 | +$1,095,364 | +114% | Filing P/S | 21 Aug 2026 |
| Francis V Wisneski Jr. | Director | $909,508 | -$483,500 | -35% | Mixed | 04 Jun 2026 |
| Louis P. Maltezos | President-Central&West USA Can | $854,044 | -$7,745 | -0.9% | Mixed | 18 May 2026 |
| Jennifer L. Miller | Director | $724,084 | -$280,795 | -28% | Filing P/S | 24 Aug 2026 |
| Nickolas Stavropoulos | Director | $625,923 | -$614,367 | -50% | Mixed | 04 Jun 2026 |
| David J. Corrsin | EVP and General Counsel, Director | $613,208 | -$2,330 | -0.38% | Mixed | 17 Aug 2026 |
| Charles R. Patton | Director | $607,512 | Mixed | 04 Jun 2026 | ||
| Claire D'Oyly-Hughes Johnson | Director | $569,823 | Mixed | 04 Jun 2026 | ||
| Bakas Michael T. | President - Renewable Fuels | $440,650 | Mixed | 10 Mar 2026 | ||
| Peter Christakis | President-EastUSA, ProjectRisk | $421,456 | Mixed | 18 May 2026 | ||
| Britta MacIntosh | Senior Vice President | $291,115 | Mixed | 17 Sep 2023 | ||
| David Anderson | Executive Vice President, Director | $167,000 | Mixed | 14 Jun 2021 | ||
| Mark Chiplock | Evp, Cfo & Cao | $77,926 | -$1,842,006 | -96% | Mixed | 10 Mar 2026 |
| Spencer Doran Hole | EVP and CFO | $61,936 | Mixed | 12 Aug 2024 | ||
| Douglas I. Foy | Director | $18,061 | Mixed | 04 Nov 2022 | ||
| Robert Georgeoff | Executive Vice President | Mixed | 04 Mar 2022 | |||
| Lauren Todd | SVP - HR and Operations | Mixed | 04 Mar 2022 |
Recent insider transactions for Ameresco, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| George P. Sakellaris | AMRC | Class A Common Stock | Purchase | 0.3% | $66,390 | $22.13 | 3,000 | 1,013,597 | 28 Aug 2026 | Direct |
| George P. Sakellaris | AMRC | Class A Common Stock | Purchase | 0.4% | $91,360 | $22.84 | 4,000 | 1,010,597 | 27 Aug 2026 | Direct |
| George P. Sakellaris | AMRC | Class A Common Stock | Purchase | 0.1% | $21,920 | $21.92 | 1,000 | 1,006,597 | 26 Aug 2026 | Direct |
| George P. Sakellaris | AMRC | Class A Common Stock | Purchase | 0.5% | $109,747 | $21.95 | 5,000 | 1,005,597 | 25 Aug 2026 | Direct |
| Jennifer L. Miller | AMRC | Class A Common Stock | Purchase | 6.15% | $41,920 | $20.96 | 2,000 | 34,546 | 24 Aug 2026 | Direct |
| Joseph W. Sutton | AMRC | Class A Common Stock | Purchase | 13.8% | $202,439 | $20.87 | 9,700 | 80,246 | 24 Aug 2026 | Direct |
| George P. Sakellaris | AMRC | Class A Common Stock | Purchase | 0.5% | $104,550 | $20.91 | 5,000 | 1,000,597 | 24 Aug 2026 | Direct |
| Brian C. Cox | AMRC | Class A Common Stock | Purchase | 11.6% | $100,085 | $21.64 | 4,625 | 44,325 | 21 Aug 2026 | Direct |
| David J. Corrsin | AMRC | Stock Option (right to purchase) | Award | 25,000 | 25,000 | 17 Aug 2026 | Direct | |||
| George P. Sakellaris | AMRC | Class A Common Stock | Purchase | 0.1% | $25,900 | $25.90 | 1,000 | 995,597 | 11 Aug 2026 | Direct |
| George P. Sakellaris | AMRC | Class A Common Stock | Purchase | 0.1% | $25,270 | $25.27 | 1,000 | 994,597 | 10 Aug 2026 | Direct |
| Brian C. Cox | AMRC | Class A Common Stock | Purchase | $995,279 | $25.07 | 39,700 | 39,700 | 10 Aug 2026 | Direct | |
| George P. Sakellaris | AMRC | Class A Common Stock | Purchase | 0.51% | $129,750 | $25.95 | 5,000 | 993,597 | 07 Aug 2026 | Direct |
| Brian C. Cox | AMRC | Restricted Stock Unit | Award | 5,132 | 5,132 | 01 Aug 2026 | Direct | |||
| Charles R. Patton | AMRC | Class A Common Stock | Options Exercise | 77.9% | 10,435 | 23,824 | 04 Jun 2026 | Direct | ||
| Charles R. Patton | AMRC | Restricted Stock Unit | Options Exercise | -100% | -10,435 | 0 | 04 Jun 2026 | Direct | ||
| Francis V Wisneski Jr. | AMRC | Class A Common Stock | Options Exercise | 41.4% | 10,435 | 35,667 | 04 Jun 2026 | Direct | ||
| Francis V Wisneski Jr. | AMRC | Restricted Stock Unit | Options Exercise | -100% | -10,435 | 0 | 04 Jun 2026 | Direct | ||
| Francis V Wisneski Jr. | AMRC | Restricted Stock Unit | Award | 4,812 | 4,812 | 04 Jun 2026 | Direct | |||
| Nickolas Stavropoulos | AMRC | Class A Common Stock | Options Exercise | 74% | 10,435 | 24,546 | 04 Jun 2026 | Direct | ||
| Nickolas Stavropoulos | AMRC | Restricted Stock Unit | Options Exercise | -100% | -10,435 | 0 | 04 Jun 2026 | Direct | ||
| Nickolas Stavropoulos | AMRC | Restricted Stock Unit | Award | 4,812 | 4,812 | 04 Jun 2026 | Direct | |||
| Jennifer L. Miller | AMRC | Class A Common Stock | Options Exercise | 47.2% | 10,435 | 32,546 | 04 Jun 2026 | Direct | ||
| Jennifer L. Miller | AMRC | Restricted Stock Unit | Options Exercise | -100% | -10,435 | 0 | 04 Jun 2026 | Direct | ||
| Jennifer L. Miller | AMRC | Restricted Stock Unit | Award | 4,812 | 4,812 | 04 Jun 2026 | Direct | |||
| Joseph W. Sutton | AMRC | Class A Common Stock | Options Exercise | 17.4% | 10,435 | 70,546 | 04 Jun 2026 | Direct | ||
| Joseph W. Sutton | AMRC | Restricted Stock Unit | Options Exercise | -100% | -10,435 | 0 | 04 Jun 2026 | Direct | ||
| Joseph W. Sutton | AMRC | Restricted Stock Unit | Award | 4,812 | 4,812 | 04 Jun 2026 | Direct | |||
| Claire D'Oyly-Hughes Johnson | AMRC | Class A Common Stock | Options Exercise | 103.2% | 10,435 | 20,546 | 04 Jun 2026 | Direct | ||
| Claire D'Oyly-Hughes Johnson | AMRC | Restricted Stock Unit | Options Exercise | -100% | -10,435 | 0 | 04 Jun 2026 | Direct | ||
| Claire D'Oyly-Hughes Johnson | AMRC | Restricted Stock Unit | Award | 4,812 | 4,812 | 04 Jun 2026 | Direct | |||
| Francis V Wisneski Jr. | AMRC | Class A Common Stock | Sale | -16.5% | $180,600 | $36.12 | -5,000 | 25,232 | 29 May 2026 | Direct |
| Francis V Wisneski Jr. | AMRC | Class A Common Stock | Options Exercise | 19.8% | 5,000 | 30,232 | 29 May 2026 | Direct | ||
| Francis V Wisneski Jr. | AMRC | Stock Option (right to puchase) | Options Exercise | -25% | -5,000 | 15,000 | 29 May 2026 | Direct | ||
| Francis V Wisneski Jr. | AMRC | Class A Common Stock | Sale | -28.4% | $302,900 | $30.29 | -10,000 | 25,232 | 19 May 2026 | Direct |
| Francis V Wisneski Jr. | AMRC | Class A Common Stock | Options Exercise | 39.6% | 10,000 | 35,232 | 19 May 2026 | Direct | ||
| Francis V Wisneski Jr. | AMRC | Stock Option (right to puchase) | Options Exercise | -33.3% | -10,000 | 20,000 | 19 May 2026 | Direct | ||
| Jennifer L. Miller | AMRC | Class A Common Stock | Sale | -31.1% | $322,715 | $32.27 | -10,000 | 22,111 | 18 May 2026 | Direct |
| Jennifer L. Miller | AMRC | Class A Common Stock | Options Exercise | 45.2% | 10,000 | 32,111 | 18 May 2026 | Direct | ||
| Jennifer L. Miller | AMRC | Stock Option (right to purchase) | Options Exercise | -100% | -10,000 | 0 | 18 May 2026 | Direct | ||
| Louis P. Maltezos | AMRC | Stock Option (right to puchase) | Award | 30,000 | 30,000 | 18 May 2026 | Direct | |||
| Nicole E. Bulgarino | AMRC | Stock Option (right to puchase) | Award | 30,000 | 30,000 | 18 May 2026 | Direct | |||
| Peter Christakis | AMRC | Stock Option (right to puchase) | Award | 30,000 | 30,000 | 18 May 2026 | Direct | |||
| Nickolas Stavropoulos | AMRC | Class A Common Stock | Sale | -8.76% | $46,070 | $34.00 | -1,355 | 14,111 | 15 May 2026 | Direct |
| Nickolas Stavropoulos | AMRC | Class A Common Stock | Options Exercise | 9.6% | 1,355 | 15,466 | 15 May 2026 | Direct | ||
| Nickolas Stavropoulos | AMRC | Stock Option (right to purchase) | Options Exercise | -18.4% | -1,355 | 6,000 | 15 May 2026 | Direct | ||
| Joseph W. Sutton | AMRC | Class A Common Stock | Options Exercise | 20% | 10,000 | 60,111 | 23 Apr 2026 | Direct | ||
| Joseph W. Sutton | AMRC | Stock Option (right to purchase) | Options Exercise | -100% | -10,000 | 0 | 23 Apr 2026 | Direct | ||
| Mark Chiplock | AMRC | Class A Common Stock | Sale | -14.1% | $6,910 | $25.31 | -273 | 1,666 | 12 Mar 2026 | Direct |
| Louis P. Maltezos | AMRC | Class A Common Stock | Sale | -0.94% | $7,745 | $25.31 | -306 | 32,095 | 12 Mar 2026 | Direct |
* marks a reported price that did not pass the local price check.