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Tecogen
TGEN
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Overview
Overview
News
News
Posts
Posts
Financials
Financials
Forecast
Forecast
Valuation
Valuation
Shareholders
Shareholders
Profile
Profile
All Shareholders
Institutional Holders
Insiders
All Shareholders
Shareholder Type
Individuals & Insiders
33.82%
Public and others
28.65%
Institutions
26.38%
Private companies
6.00%
Hedge funds
5.14%
Major Shareholders
Latest
Major Shareholders Latest
Shareholder
% Held
Shares Held
Change %
Shares Changed
Report Date
John Hatsopoulos
Independent Lead Director
15.70%
4.74M
0.15%
+0
03/20/2026
Michael Bass
7.49%
2.26M
0.07%
+0
04/25/2025
Estate Of George N. Hatsopoulos
6.00%
1.81M
0.06%
+0
04/25/2025
Portolan Capital Management, LLC
5.14%
1.55M
3.66%
+1.11M
06/30/2026
Earl Lewis
Independent Director
3.35%
1.01M
0.03%
+0
03/27/2026
Daphne Hatsopoulos
3.09%
931.92K
0.03%
+0
04/25/2025
Vanguard Capital Management, LLC
2.96%
894.63K
0.07%
+28.22K
06/30/2026
Bard Associates Inc.
2.26%
682.22K
0.04%
-6.09K
06/30/2026
Clear Harbor Asset Management, LLC
2.15%
650.00K
0.02%
+0
06/30/2026
Tryfon Natsis
1.52%
460.30K
0.01%
+0
06/30/2025
Herald Investment Management Ltd.
1.39%
420.00K
0.01%
+0
06/30/2026
Gratia Capital, LLC
1.29%
388.66K
--
+388.66K
06/30/2026
UBS Asset Management AG
1.21%
364.63K
0.13%
+43.21K
06/30/2026
Meros Investment Management, LP
1.17%
353.49K
0.20%
+61.78K
06/30/2026
Palisades Investment Partners, LLC
1.07%
323.09K
0.05%
-10.82K
06/30/2026
Susquehanna International Group, LLP
1.05%
315.83K
0.68%
+206.37K
06/30/2026
Morgan Stanley
1.00%
301.70K
0.74%
+224.96K
06/30/2026
Raymond James Financial, Inc.
0.96%
290.26K
0.34%
+104.47K
06/30/2026
Susan Hirsch
Independent Director
0.88%
265.42K
<0.01%
+5.00K
04/13/2026
BlackRock, Inc.
0.83%
251.46K
0.22%
+66.69K
06/30/2026
