Tecogen
TGEN on NYSEAmerican. Market value $77m.
Should I look at this?
We have not checked this company yet
This is not advice.
Who owns it
2 long-term investors we follow own it, up from 1 last quarter. 69 funds in all.
- GAMCO InvestorsMario Gabelli
- Value
- $208,800
- Share of fund
- <0.1%
| Fund | Value | Share of that fund | Change |
|---|---|---|---|
| Heartland AdvisorsBill Nasgovitz | $950,562 | <0.1% | New |
| GAMCO InvestorsMario Gabelli | $208,800 | <0.1% |
Largest holders overall
- Portolan Capital Management$8mAdded
- Vanguard Capital Management$4mAdded
- Bard Associates$4m
- Clear Harbor Asset Management$3m
- Herald Investment Management$2m
- Gratia Capital$2mNew
- UBS Group AG$2mAdded
- Meros Investment Management, LP$2mAdded
- Palisades Investment Partners$2mCut
- Susquehanna International Group, LLP$2mAdded
From 13F filings for the quarter ended 30 June 2026.
Big holders and activists
1 investor owns more than 5%.
- Portolan Capital Management, LLCPassive investorat least 5.2%(filed with 1 related holder)Since 3 June 2026
- Tryfon Natsis and Depoina Pantopoulou, as Joint Tenants with the Right of SurvivorshipPassive investorSold down below 5%Since 30 June 2025
| Holder | Stake | Since | |
|---|---|---|---|
Portolan Capital Management, LLC Passive investor | at least 5.2% (filed with 1 related holder) | 3 June 2026 | |
Tryfon Natsis and Depoina Pantopoulou, as Joint Tenants with the Right of Survivorship Passive investor | Sold down below 5% | 30 June 2025 |
From Schedule 13D and 13G filings: anyone owning more than 5% must file one.
What insiders did
In the last 12 months, 6 insiders bought $134,101 of shares on the open market.
- Ghoniem AhmedDirectorBought
- Date
- 24 April 2026
- Shares
- 12,723
- Price
- $0.79
- Value
- $10,051
- Hirsch Susan BDirectorBought
- Date
- 13 April 2026
- Shares
- 5,000
- Price
- $3.73
- Value
- $18,650
- Hirsch Susan BDirectorBought
- Date
- 27 March 2026
- Shares
- 10,000
- Price
- $2.54
- Value
- $25,400
- Lewis EarlDirectorBought
- Date
- 27 March 2026
- Shares
- 5,000
- Price
- $2.52
- Value
- $12,600
- Lewis EarlDirectorBought
- Date
- 26 March 2026
- Shares
- 5,000
- Price
- $2.88
- Value
- $14,400
- Whiting John Kimball IVGeneral Counsel & SecretaryBought
- Date
- 23 March 2026
- Shares
- 10,000
- Price
- $2.38
- Value
- $23,800
- Deschenes Roger P.CAOBought
- Date
- 20 March 2026
- Shares
- 10,000
- Price
- $2.23
- Value
- $22,300
- Rangesh AbinandChief Executive Officer, DirectorBought
- Date
- 20 March 2026
- Shares
- 3,000
- Price
- $2.30
- Value
- $6,900
| Date | Who | Did | Shares | Price | Value |
|---|---|---|---|---|---|
| 24 April 2026 | Ghoniem Ahmed Director | Bought | 12,723 | $0.79 | $10,051 |
| 13 April 2026 | Hirsch Susan B Director | Bought | 5,000 | $3.73 | $18,650 |
| 27 March 2026 | Hirsch Susan B Director | Bought | 10,000 | $2.54 | $25,400 |
| 27 March 2026 | Lewis Earl Director | Bought | 5,000 | $2.52 | $12,600 |
| 26 March 2026 | Lewis Earl Director | Bought | 5,000 | $2.88 | $14,400 |
| 23 March 2026 | Whiting John Kimball IV General Counsel & Secretary | Bought | 10,000 | $2.38 | $23,800 |
| 20 March 2026 | Deschenes Roger P. CAO | Bought | 10,000 | $2.23 | $22,300 |
| 20 March 2026 | Rangesh Abinand Chief Executive Officer, Director | Bought | 3,000 | $2.30 | $6,900 |
From Form 4 filings: insiders must report trades in their own company's shares within two days.
The deep dive
Everything above is arithmetic on public filings. The deep dive reads the last ten years of annual reports, the proxy statements, and the earnings calls, then argues the case the way Buffett, Klarman, and Hohn would, and checks every claim against the source.
- What the business is worth, as a range, and the margin of safety at today’s price
- Prices to start buying, buy, and buy hard
- The three things that would make this a mistake
- Every number footnoted to the filing it came from
Your first deep dive is free.
Not advice. Numbers on this page come from SEC filings and are updated each night; prices are updated again after the US market closes. The five-year figures are rounded.