Tecogen TGEN Insider Ownership

NYSE TGEN

$2.17 +0.06 (+2.63%)

As of: Oct 20, 2026 · 1:33 PM EDT

Insider Holdings by Owner

2.81Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

11.40%

■0% pp QoQ

Shares Held by Insiders

3.44Mn

filed for Sep 2026

■0.00% QoQ

Shares Outstanding

30.18Mn

30,179,072 shares

Direct Holdings

2.81Mn

Indirect: 635.00K

Net Shares Traded (QoQ)

no net change in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 10, 2026

Over the past 12 months, Tecogen insiders bought $134,049 of stock on the open market (60.72K shares) and made no open-market sales.

By number of insiders, Tecogen saw 6 insiders buy on the open market over the past 12 months and none sell.
Among Tecogen insiders, Susan B. Hirsch (Director) led open-market buying over the past 12 months with $44,050 of purchases (15K shares); the latest was on April 13, 2026.
Ahmed Ghoniem (Director) made the most recent open-market trade by an insider of Tecogen, a purchase of 12.72K shares for $10,000 on April 24, 2026.
Outside the open market, Tecogen insiders received 464.21K shares in stock awards and acquired 50K shares through option exercises and conversions over the past 12 months.
According to Business Quant data, insiders at Tecogen reported 3.44Mn shares in total in their latest Form 4 filings, unchanged from 3.44Mn shares at the end of Q2 2026 and up 8.48% from 3.17Mn shares at the end of Q3 2025.
By type of ownership, TGEN insiders hold 81.55% of their shares directly (2.81Mn shares) and 18.45% indirectly (635K shares).
The insider holdings in Tecogen belong to 9 insiders who have reported on Form 4 within the past two years.
TGEN's three largest insider shareholders, per their latest Form 4 filings, are Earl Lewis (Director, 1.65Mn shares), John Hatsopoulos (Director, 1.04Mn shares) and Susan B. Hirsch (Director, 265.42K shares).
The largest insider, Earl Lewis, holds 47.82% of TGEN's insider total.
Institutions owned 31.42% of TGEN shares as of Q2 2026; insiders' latest Form 4 filings account for about 11.40%, leaving roughly 57.18% with other investors, including the public.
Over the past 12 months, 11 insiders reported transactions in Tecogen stock in 24 Form 4 filings.
This summary of Tecogen insider activity covers Form 4 filings through September 8, 2026.

Form 4 Holdings

Insiders Holding TGEN

Insiders 9

Shares held 2.81Mn

Of outstanding 9.30%

#	Insider	Position	Direct	Total	Share of Insiders	Last Filed
1	John Hatsopoulos	Co Chief Executive Officer	1,038,951	1,038,951	37.0%	23 Mar, 2026
2	Earl Lewis	Director	1,011,006	1,011,006	36.0%	27 Mar, 2026
3	Susan B Hirsch	Director	265,416	265,416	9.5%	14 Apr, 2026
4	Abinand Rangesh	Chief Executive Officer	241,274	241,274	8.6%	08 Sep, 2026
5	Roger P. Deschenes	Chief Financial Officer	81,975	81,975	2.9%	08 Sep, 2026
6	Robert Panora	Coo And President	72,194	72,194	2.6%	08 Sep, 2026
7	John Kimball Iv Whiting	General Counsel Secretary	41,954	41,954	1.5%	08 Sep, 2026
8	Stephen Lafaille	Vp Of Business Development	41,389	41,389	1.5%	08 Sep, 2026
9	Ahmed Ghoniem	Director	12,723	12,723	0.5%	27 Apr, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

293 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
26 Jun, 2026	John Kimball Iv Whiting	General Counsel Secretary	Acquired A	19,342	$0.00	$0	41,954	Direct
26 Jun, 2026	Robert Panora	Coo And President	Acquired A	9,671	$0.00	$0	72,194	Direct
26 Jun, 2026	Abinand Rangesh	Chief Executive Officer	Acquired A	174,081	$0.00	$0	241,274	Direct
26 Jun, 2026	Roger P. Deschenes	Chief Financial Officer	Acquired A	29,013	$0.00	$0	81,975	Direct
26 Jun, 2026	Stephen Lafaille	Vp Of Business Development	Acquired A	29,013	$0.00	$0	41,389	Direct
26 Jun, 2026	John Kimball Iv Whiting	General Counsel Secretary	Acquired A	19,342	—	—	19,342	Direct
26 Jun, 2026	John M Albertine	Director	Acquired A	25,000	$5.17	$129.25K	25,000	Direct
26 Jun, 2026	Angelina Galiteva	Director	Acquired A	25,000	$5.17	$129.25K	25,000	Direct
26 Jun, 2026	Robert Panora	Coo And President	Acquired A	9,671	—	—	9,671	Direct
26 Jun, 2026	Stephen Lafaille	Vp Of Business Development	Acquired A	29,013	—	—	29,013	Direct
26 Jun, 2026	Earl Lewis	Director	Acquired A	25,000	$5.17	$129.25K	25,000	Direct
26 Jun, 2026	Ahmed Ghoniem	Director	Acquired A	25,000	$5.17	$129.25K	25,000	Direct
26 Jun, 2026	Abinand Rangesh	Chief Executive Officer	Acquired A	174,081	—	—	174,081	Direct
26 Jun, 2026	Susan B Hirsch	Director	Acquired A	25,000	$5.17	$129.25K	25,000	Direct
26 Jun, 2026	Roger P. Deschenes	Cao	Acquired A	29,013	—	—	29,013	Direct
26 Jun, 2026	Abinand Rangesh	Chief Executive Officer	Acquired A	26,041	$5.17	$134.63K	26,041	Direct
26 Jun, 2026	Robert Panora	Coo And President	Acquired A	26,041	$5.17	$134.63K	26,041	Direct
24 Apr, 2026	Ahmed Ghoniem	Director	Acquired P	12,723	$0.79	$10.00K	12,723	Direct
24 Apr, 2026	Ahmed Ghoniem	Director	Disposed M	12,723	$0.79	$10.00K	0	Direct
13 Apr, 2026	Susan B Hirsch	Director	Acquired P	5,000	$3.73	$18.65K	265,416	Direct

Showing 1 to 20 of 293 transactions