TECOGEN INC.

Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip

TGEN Industrial Machinery & Equipment People in Industrial Machinery & Equipment SEC CIK 0001537435 ↗

Computed from SEC EDGAR filings and closing prices — not copied from any wealth ranking. Dataset . How we calculate this.

Market capitalisation
$92.07M
30,187,822 shares Covers every share class this company has on file.
Insiders on file
2
people who have filed Form 3, 4 or 5 naming this issuer
Value of insider-held stock
$6.42M
from the holdings reported on Forms 3/4/5; this figure has no separate as-of date on file
Insider-held share of market cap
6.97%
insider-held value divided by market capitalisation

What TECOGEN INC. reports

Revenue and net income below are for fiscal period FY2025, the period label carried by this company’s own annual XBRL filings to the SEC. Fiscal years do not line up between companies — one company’s FY2026 can cover much the same months as another’s FY2025 — so compare the periods, not just the numbers.

Revenue
$27.07M
FY2025 annual revenue, from this company’s own annual XBRL filings to the SEC
Net income
-$8.25M
FY2025 a loss for the period, from this company’s own annual XBRL filings to the SEC
Employees
119
Yahoo Finance
Where the employee count comes from

Headcount comes from Yahoo Finance, not from a filing. The date beside it is the day we retrieved the figure — it is not the date the company counted its staff, and Yahoo does not publish that date. Unlike the SEC filings behind the other figures on this page, this one carries no open licence, so we publish the number and nothing else from that source.

Insiders at TECOGEN INC.

Shares is what each person last reported holding here.

Everyone below has filed at least one insider report against this company.

Value is that share count priced at the same closing price used everywhere else on this site. A row priced from only some of a person’s securities says so — we do not quietly present a partial sum as a complete one.

People who file insider reports against TECOGEN INC..
Insider Reported role Shares Value Last action
John Hatsopoulos Board Member 1,038,951 $3.25M M Option exercise or conversion Mar 20, 2026 position reported
Earl Lewis Board Member 1,011,006 $3.16M P Open-market purchase Mar 27, 2026 position reported

Events from filings

Detected automatically in the filings linked below. Each headline is built from the numbers in those filings, not written by a model. Newest first; events older than 45 days stay listed and are marked as older.

Earl Lewis bought 100,000 TECOGEN INC. (TGEN) shares for $71,000 on Nov 22, 2024

Large trade for this person

Flagged because this trade was large compared with this person’s own earlier open-market trades in the same currency — not because it is large in absolute terms. A trade that is routine for one insider can be flagged for another.

Earl Lewis bought 100,000 TECOGEN INC. (TGEN) shares for $71,000 on Nov 22, 2024
Date Insider Transaction Shares Price Value Filing
Nov 22, 2024 Earl Lewis P Open-market purchase 100,000 held after: 737,000 $0.71 $71,000 SEC filing ↗

Source: SEC EDGAR (United States); every row links to where it was published. Event computed Sep 14, 2026.

John Hatsopoulos bought 13,800 TECOGEN INC. (TGEN) shares for $10,902 on May 21, 2024

Large trade for this person

Flagged because this trade was large compared with this person’s own earlier open-market trades in the same currency — not because it is large in absolute terms. A trade that is routine for one insider can be flagged for another.

John Hatsopoulos bought 13,800 TECOGEN INC. (TGEN) shares for $10,902 on May 21, 2024
Date Insider Transaction Shares Price Value Filing
May 21, 2024 John Hatsopoulos P Open-market purchase 13,800 held after: 913,285 $0.79 $10,902 SEC filing ↗

Source: SEC EDGAR (United States); every row links to where it was published. Event computed Sep 14, 2026.

John Hatsopoulos bought 10,000 TECOGEN INC. (TGEN) shares for $7,400 on May 15, 2024

Large trade for this person

Flagged because this trade was large compared with this person’s own earlier open-market trades in the same currency — not because it is large in absolute terms. A trade that is routine for one insider can be flagged for another.

John Hatsopoulos bought 10,000 TECOGEN INC. (TGEN) shares for $7,400 on May 15, 2024
Date Insider Transaction Shares Price Value Filing
May 15, 2024 John Hatsopoulos P Open-market purchase 10,000 held after: 896,485 $0.74 $7,400 SEC filing ↗

Source: SEC EDGAR (United States); every row links to where it was published. Event computed Sep 14, 2026.

Recent insider transactions

Of the 48 rows we hold, 41 are open-market purchases (P) and 0 open-market sales — the only codes we count as buying or selling.

The rest — awards, shares withheld to pay tax, option exercises, gifts and so on — follow from an employment contract or a transfer arranged off-market, not from a decision to buy or sell, so counting them would turn this into a pay table.

A price of 0.00 is a real reported figure on gifts (G) and share awards (A) — not a gap in our data.

Insider transactions disclosed to the SEC for TECOGEN INC., newest first, each with the filing behind it.
Date Insider Transaction Shares Price Value Filing
Mar 27, 2026 Earl Lewis P Open-market purchase 5,000 $2.52 $12.6K SEC filing ↗
Mar 26, 2026 Earl Lewis P Open-market purchase 5,000 $2.88 $14.4K SEC filing ↗
Mar 20, 2026 John Hatsopoulos M Option exercise or conversion 50,000 $0.88 $44.0K SEC filing ↗
May 6, 2025 Earl Lewis X In-the-money option exercise 6,250 $1.10 $6.9K SEC filing ↗
May 6, 2025 Earl Lewis X In-the-money option exercise 15,000 $1.75 $26.3K SEC filing ↗
May 6, 2025 Earl Lewis X In-the-money option exercise 12,500 $1.20 $15.0K SEC filing ↗
May 1, 2025 Earl Lewis J Other acquisition or disposition 240,256 $2.14 $514.1K SEC filing ↗
Nov 22, 2024 Earl Lewis X In-the-money option exercise 100,000 $0.71 $71.0K SEC filing ↗
Nov 22, 2024 Earl Lewis P Open-market purchase 100,000 $0.71 $71.0K SEC filing ↗
Sep 27, 2024 John Hatsopoulos P Open-market purchase 10,000 $0.84 $8.4K SEC filing ↗
Sep 25, 2024 John Hatsopoulos P Open-market purchase 10,000 $0.86 $8.6K SEC filing ↗
Aug 19, 2024 John Hatsopoulos P Open-market purchase 10,000 $0.90 $9.0K SEC filing ↗
Jul 15, 2024 Earl Lewis P Open-market purchase 10,000 $0.68 $6.8K SEC filing ↗
Jul 10, 2024 John Hatsopoulos P Open-market purchase 22,466 $0.65 $14.6K SEC filing ↗
May 29, 2024 John Hatsopoulos P Open-market purchase 10,000 $0.80 $8.0K SEC filing ↗
May 28, 2024 John Hatsopoulos P Open-market purchase 1,265 $0.80 $1.0K SEC filing ↗
May 24, 2024 John Hatsopoulos P Open-market purchase 8,735 $0.80 $7.0K SEC filing ↗
May 22, 2024 John Hatsopoulos P Open-market purchase 3,200 $0.79 $2.5K SEC filing ↗
May 21, 2024 John Hatsopoulos P Open-market purchase 13,800 $0.79 $10.9K SEC filing ↗
May 16, 2024 John Hatsopoulos P Open-market purchase 3,000 $0.75 $2.3K SEC filing ↗
May 15, 2024 John Hatsopoulos P Open-market purchase 10,000 $0.74 $7.4K SEC filing ↗
May 1, 2024 Earl Lewis P Open-market purchase 5,000 $0.75 $3.8K SEC filing ↗
Apr 24, 2024 Earl Lewis P Open-market purchase 10,000 $0.68 $6.8K SEC filing ↗
Apr 24, 2024 John Hatsopoulos P Open-market purchase 5,000 $0.67 $3.4K SEC filing ↗
Apr 23, 2024 John Hatsopoulos P Open-market purchase 5,000 $0.69 $3.5K SEC filing ↗

From SEC Form 4 filings. Every row links to the filing it came from. How we calculate this.

What a Form 4 is

The report an officer, director or large shareholder must file after trading their own company’s stock.

Think a number here is wrong? Open the linked filing and compare — how to report it.

Sources and technical notes

Every figure on this page comes from filings to the U.S. SEC via EDGAR. Nothing here is estimated, and nothing is taken from press coverage or company websites.

Share count: cover page of the latest filing (dei:EntityCommonStockSharesOutstanding), taken from TECOGEN INC.’s own filings and multiplied by our closing price. Full method.

What that share count means

the share count the company itself prints on the cover of its most recent filing, as of the date it signed that filing.

We do not take a market cap from a data vendor, and we do not estimate one: the figure is a share count from TECOGEN INC.’s own SEC filings multiplied by the closing price we hold for the same stock.