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No insider purchase over the last 90 days. The latest was filed 27 Apr 2026.
Tecogen Inc.: what insiders have been doing
Every trade that managers of Tecogen Inc. disclose to SEC (Form 4) is tracked on this page. The company sits in the Industry sector. The last twelve months, up to 18 October 2026, brought 16 filings signed by 9 insiders.
Every open-market trade in the period is a purchase: 8 purchases worth €116k, from 6 insiders, and not a single sale. Unlike grants, an open-market purchase is paid for by the insider, at the market price. Among those who bought: 4 senior executives, 1 finance chief and 1 chief executive. The largest single trade was a purchase of €22k by Hirsch Susan B, published on 27 March 2026.
In the case of 8 purchases, another manager of the company was buying within the same 30 days. Purchases made close together by different insiders form what is called a cluster. The clock since the last published purchase (27 April 2026) now reads 174 days. Between a trade and the moment it shows up on SEC (Form 4), the median delay is 4 days. For comparison, the SEC allows two business days to file a Form 4.
Compared with its exchange (5,816 companies, median 19 filings), a count of 16 filings is below the norm. Looking back to 2016, when coverage begins, insiders filed 93 purchases and 1 sale. The 10-K for the year ended 31 December 2025 shows 27.1 m USD of revenue and -8.2 m USD of net income.
For comparison within the same sector, see the insider buying recorded at Tennant Co and Butler National Corp. Source: insider filings from SEC (Form 4). Past trades are no guide to future returns.
Insider Decl.
111
Thresholds
n/a
Buy Volume
€815,917
93 ops. · all time
Sell Volume
€107,111
1 ops. · all time
Who traded when
BuySaleEarl Lewis2 buys
Susan B. Hirsch2 buys
Abinand Rangesh1 buy
Ahmed Ghoniem1 buy
Earl R. Lewis1 buy
John Kimball Whiting IV1 buy
+3 other insiders
Since the insiders bought
- -20.5%Entry US$4.20 · Close at T+90 US$3.34
- +2.3%Entry US$3.92 · Close at T+90 US$4.01
- +110.2%Entry US$2.46 · Close at T+90 US$5.17
Entry is the close on the day after publication, the first price a reader could act on. Prices in the listing currency. Past moves are not a forecast.
This score ranks the purchase within its own market. A position size is suggested only on the venues of the backtested strategy universe; elsewhere, signals stay on watch. Not investment advice.
Fundamental score
Ranked 22,704 of 24,158 companies
17.4
score / 100
Value13
Quality22
FCF yld-15%
Earn yld-12%
EV/EBITDA·
ROE-78%
Gross mgn36%
Net mgn-30%
Debt/EBITDA·
Pillars2/3
Transparent value + quality ranking, distinct from the insider signal.
Financial data
as of FY 2025FY ended December 2025 · cache
US$2.25
Analyst consensus
3 analysts1.00/5
US$7.00Target US$8.17(+263%)US$10.00
Income statement
RevenueUS$27.1M
Gross profitUS$9.8M36% margin
EBITDA-US$7.2M-27% margin
Net income-US$8.2M-42.3% margin
Valuation
PER (forward)15.0x
P/Book3.8x
Beta2.22
Balance sheet & cash
Market capUS$67.9M
Total debtUS$2.8M
Free Cash Flow-US$10.3M
Debt / Equity15%
Profitability & ownership
ROE-78.3%
ROA-19.6%
% insiders39.6%
% institutions31.3%
Last declaration on 8 September 2026
Declarations111 total
29,013 shares0Common StockSEC:0001537435-26-000088:0
9,671 shares0Common StockSEC:0001585814-26-000003:0
29,013 shares0Common StockSEC:0001537435-26-000087:0
174,081 shares0Common StockSEC:0001537435-26-000086:0
19,342 shares0Common StockSEC:0001808199-26-000003:0
29,013 sharesCommon StockSEC:0001537435-26-000049:0
29,013 sharesCommon StockSEC:0001537435-26-000050:0
12,723 shares@ US$0.7860.0075% mcap100.0% of flowCommon StockSEC:0001537435-26-000032:0
Canonical exit: 23 Jul 2026 (T+90)
5,000 shares@ US$3.730.014% mcap37.6% of flowCommon StockSEC:0001827663-26-000004:0
Canonical exit: 12 Jul 2026 (T+90)
10,000 shares@ US$2.5452.2% of flowCommon StockSEC:0001827663-26-000002:0
Canonical exit: 25 Jun 2026 (T+90)
5,000 shares@ US$2.881753.3% of flowCommon StockSEC:0001537435-26-000024:0
Canonical exit: 24 Jun 2026 (T+90)
5,000 shares@ US$2.519246.7% of flowCommon StockSEC:0001230427-26-000002:0
Canonical exit: 25 Jun 2026 (T+90)
10,000 shares@ US$2.23100.0% of flowCommon StockSEC:0001537435-26-000020:0
Canonical exit: 18 Jun 2026 (T+90)
3,000 shares@ US$2.29874.3% of flowCommon StockSEC:0001537435-26-000019:0
Canonical exit: 18 Jun 2026 (T+90)
50,000 shares@ US$0.88100.0% of flowCommon StockSEC:0001274775-26-000003:0
10,000 shares@ US$2.38100.0% of flowCommon StockSEC:0001537435-26-000021:0
Canonical exit: 21 Jun 2026 (T+90)
11,976 shares0Common StockSEC:0001537435-25-000122:0
11,976 shares0Common StockSEC:0001537435-25-000120:0
17,964 shares0Common StockSEC:0001537435-25-000119:0
53,892 shares0Common StockSEC:0001537435-25-000118:0
26,000 shares@ US$4.6967.1% of flowCommon StockSEC:0001537435-25-000071:0
70,000 shares@ US$0.7127.5% of flowCommon StockSEC:0001537435-25-000069:0
400 shares@ US$2.50100.0% of flowCommon StockSEC:0001537435-25-000064:0
Canonical exit: 1 Jun 2025 (T+90)
12,723 shares@ US$0.795.5% of flowCommon StockSEC:0001537435-25-000058:0
15,000 shares@ US$1.753.5% of flowCommon StockSEC:0001537435-25-000031:0
25 of 111 declarations
About Tecogen Inc.
Tecogen Inc. is a U.S.-based company listed on NYSE American under the ticker TGEN, with operations and manufacturing facilities in North Billerica, Massachusetts, United States. Incorporated in Delaware in 2000, the company has built a focused position in distributed energy and clean thermal solutions, rather than competing as a broad-based industrial conglomerate. Tecogen designs, manufactures, markets, and maintains high-efficiency, ultra-clean cogeneration products, together with chillers, air-conditioning systems, and related hot-water or chilled-water equipment for commercial and industrial customers.
From an investor’s perspective, Tecogen offers exposure to energy efficiency, decentralized power generation, and HVAC-adjacent infrastructure where operating cost reduction and reliability matter. Its core product set includes natural-gas engine-driven combined heat and power systems, industrial and commercial chillers, air conditioning systems, and water-heating solutions. The business is not limited to equipment sales: it also includes service and maintenance, which can support more recurring revenue and deepen customer relationships over time.
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Tecogen’s competitive position is best understood as niche and technically differentiated. The company serves multi-family residential properties, commercial facilities, recreational venues, and industrial end markets that value lower emissions, energy savings, and dependable onsite thermal and power solutions. Rather than competing on scale alone, Tecogen appears to compete through engineering know-how, customized configurations, and lifecycle support. That makes it relevant in markets where customers seek practical decarbonization and resilience benefits without immediately moving to fully electrified systems.
Recent corporate developments suggest a company in transition from a small specialized manufacturer toward a broader growth story. In 2025 and 2026, Tecogen highlighted product-development efforts and commercial expansion initiatives, including plans tied to the data center market, which could become an important opportunity for onsite power and cooling solutions. In July 2025, the company completed a public equity offering to help fund product development, sales and marketing, additional staffing, capital expenditures, and general corporate purposes. Recent filings and earnings materials also pointed to revenue growth in 2025, although profitability remained under pressure, indicating that execution and scale remain key variables for the investment case.
Overall, Tecogen is a specialized U.S. clean-energy equipment provider with a narrow but relevant market position, listed on NYSE American in the United States, and currently focused on expanding its commercial footprint while continuing to invest in product development and market expansion.
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