Tecogen Inc. (TGEN)
NYSE: TGEN · Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip · North Billerica, MA · filing with the SEC since 2011
Who owns Tecogen Inc.
As filed with the SECHolders of 5% or more
1
Portolan Capital Management, LLC holds 5.19% of Common Stock, $0.001 par value per share, as its SCHEDULE 13G filed Jun 10, 2026 says.
Directors and officers
11
report now, of 20 people on the record since 2013. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 1 named at left.
Holders of 5% or moreshare of the class, as filed
Portolan Capital Management, LLC
SCHEDULE 13G · filed Jun 10, 2026 · Common Stock, $0.001 par value per share
Tryfon Natsis and Depoina Pantopoulou, as Joint Tenants with the Right of Survivorship
SCHEDULE 13G/A · filed Aug 14, 2025 · Common Stock, $0.001 par value · reported falling below 5%
What TGEN reports owning in othersstakes of 5% or more, and other ties
Other ties the annual report names
Eurosite Power Inc
An entity · legal entity · owns, named in the 10-K filed Mar 19, 2026
American DG Energy
A company bought · acquisition · May 2017 · owns, named in the 10-K filed Mar 19, 2026
Insider tradesForm 4
0sales
8purchases
0sales on a scheduled plan
0people selling
$0sold, in dollars
$100,000bought, in dollars
Open-market trades on Form 4 from Sep 30, 2025 to Sep 30, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Sep 30, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window6 of 22 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Hirsch Susan B | director | 0 | $0 | 0 | 2 | $0 |
| Lewis Earl R | director | 0 | $0 | 0 | 2 | $0 |
| Rangesh Abinand | Chief Executive Officer | 0 | $0 | 0 | 1 | $0 |
| Deschenes Roger P. | Chief Financial Officer | 0 | $0 | 0 | 1 | $0 |
| Whiting John Kimball IV | General Counsel & Secretary | 0 | $0 | 0 | 1 | $0 |
| Ghoniem Ahmed | director | 0 | $0 | 0 | 1 | $0 |