Tecogen Inc. (TGEN) · Insider trading
What Tecogen's directors, officers and largest holders bought and sold themselves, from the Form 4 each of them files with the SEC within two business days of a trade. Open-market purchases and sales first: those are the trades somebody chose to make at the market price.
Bought, 12 months
$134,101
6 insiders, 8 trades
Sold, 12 months
$0
0 insiders
Net, 12 months
+$134,101
bought less sold
Latest filing
2026-09-08
filings read to 2026-10-19
Who traded, two years
| Insider | Bought | Sold | Trades | Last trade | Holds after |
|---|---|---|---|---|---|
| Panora Robert ACOO and President | – | $550,752 | 5 | 2025-06-24 | 62,523 |
| Lafaille StephenVP of Business Development | $1,000 | $345,800 | 5 | 2025-06-23 | 400 |
| Lewis EarlDirector | $98,000 | – | 3 | 2026-03-27 | 1,011,006 |
| Hirsch Susan BDirector | $44,050 | – | 2 | 2026-04-13 | 265,416 |
| Whiting John Kimball IVGeneral Counsel & Secretary | $23,800 | – | 1 | 2026-03-23 | 22,612 |
| Deschenes Roger P.CAO | $22,300 | – | 1 | 2026-03-20 | 52,962 |
| Ghoniem AhmedDirector | $10,051 | – | 1 | 2026-04-24 | 12,723 |
| Rangesh AbinandDirector, Chief Executive Officer, Other | $6,900 | – | 1 | 2026-03-20 | 67,193 |
Open-market purchases and sales
Newest first. “Plan” marks a trade made under a 10b5-1 plan set up in advance.
| Date | Insider | Trade | Shares | Price | Value | Holds after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-04-24 | Ghoniem AhmedDirector | Buy | 12,723 | 0.79 | $10,051 | 12,723 | Form 4 |
| 2026-04-13 | Hirsch Susan BDirector | Buy | 5,000 | 3.73 | $18,650 | 265,416 | Form 4 |
| 2026-03-27 | Lewis EarlDirector | Buy | 5,000 | 2.52 | $12,600 | 1,011,006 | Form 4 |
| 2026-03-27 | Hirsch Susan BDirector | Buy | 10,000 | 2.54 | $25,400 | 260,416 | Form 4 |
| 2026-03-26 | Lewis EarlDirector | Buy | 5,000 | 2.88 | $14,400 | 1,006,006 | Form 4 |
| 2026-03-23 | Whiting John Kimball IVGeneral Counsel & Secretary | Buy | 10,000 | 2.38 | $23,800 | 22,612 | Form 4 |
| 2026-03-20 | Rangesh AbinandDirector, Chief Executive Officer, Other | Buy | 3,000 | 2.30 | $6,900 | 67,193 | Form 4 |
| 2026-03-20 | Deschenes Roger P.CAO | Buy | 10,000 | 2.23 | $22,300 | 52,962 | Form 4 |
| 2025-06-24 | Panora Robert ACOO and President | Sale | 900 | 6.86 | $6,174 | 62,523 | Form 4/A |
| 2025-06-23 | Panora Robert ACOO and President | Sale | 31,800 | 6.36 | $202,248 | 63,423 | Form 4/A |
| 2025-06-23 | Lafaille StephenVP of Business Development | Sale | 10,000 | 7.25 | $72,500 | 400 | Form 4 |
| 2025-06-18 | Panora Robert ACOO and President | Sale | 13,000 | 5.03 | $65,390 | 95,223 | Form 4/A |
| 2025-06-06 | Lafaille StephenVP of Business Development | Sale | 25,000 | 5.98 | $149,500 | 400 | Form 4 |
| 2025-06-04 | Panora Robert ACOO and President | Sale | 31,000 | 5.00 | $155,000 | 13,000 | Form 4/A |
| 2025-06-04 | Lafaille StephenVP of Business Development | Sale | 15,000 | 5.00 | $75,000 | 400 | Form 4 |
| 2025-06-03 | Panora Robert ACOO and President | Sale | 26,000 | 4.69 | $121,940 | 44,000 | Form 4/A |
| 2025-06-03 | Lafaille StephenVP of Business Development | Sale | 10,000 | 4.88 | $48,800 | 400 | Form 4 |
| 2025-03-03 | Lafaille StephenVP of Business Development | Buy | 400 | 2.50 | $1,000 | 400 | Form 4 |
| 2024-11-22 | Lewis Earl RDirector | Buy | 100,000 | 0.71 | $71,000 | 737,000 | Form 4 |
Grants, exercises and other transactions
Pay, tax and paperwork rather than a choice to trade at the market price. Two years.
11 × option exercise9 × grant or award5 × option exercise1 × other
Show them
| Date | Insider | What | Shares | Price | Holds after | Filing |
|---|---|---|---|---|---|---|
| 2026-06-26 | Rangesh AbinandDirector, Chief Executive Officer | Grant or award A | +174,081 | – | 241,274 | Form 4/A |
| 2026-06-26 | Deschenes Roger P.Chief Financial Officer | Grant or award A | +29,013 | – | 81,975 | Form 4/A |
| 2026-06-26 | Lafaille StephenVP of Business Development | Grant or award A | +29,013 | – | 41,389 | Form 4/A |
| 2026-06-26 | Panora RobertCOO and President | Grant or award A | +9,671 | – | 72,194 | Form 4/A |
| 2026-06-26 | Whiting John Kimball IVGeneral Counsel & Secretary | Grant or award A | +19,342 | – | 41,954 | Form 4/A |
| 2026-03-20 | Hatsopoulos JohnDirector | Option exercise M | +50,000 | 0.88 | 1,038,951 | Form 4 |
| 2025-07-24 | Rangesh AbinandDirector, Chief Executive Officer, Other | Grant or award A | +53,892 | – | 64,193 | Form 4 |
| 2025-07-24 | Deschenes Roger P.CAO | Grant or award A | +17,964 | – | 42,962 | Form 4 |
| 2025-07-24 | Whiting John Kimball IVGeneral Counsel & Secretary | Grant or award A | +11,976 | – | 12,612 | Form 4 |
| 2025-07-24 | Lafaille StephenVP of Business Development | Grant or award A | +11,976 | – | 12,376 | Form 4 |
| 2025-06-23 | Lafaille StephenVP of Business Development | Option exercise X | +10,000 | 1.10 | 10,400 | Form 4 |
| 2025-06-16 | Panora Robert ACOO and President | Option exercise M | +12,723 | 0.79 | 25,723 | Form 4/A |
| 2025-06-16 | Panora Robert ACOO and President | Option exercise M | +30,000 | 0.71 | 55,723 | Form 4/A |
| 2025-06-16 | Panora Robert ACOO and President | Option exercise M | +52,500 | 1.10 | 108,223 | Form 4/A |
| 2025-06-16 | Panora Robert ACOO and President | Option exercise X | +12,723 | 0.79 | 82,723 | Form 4 |
| 2025-06-16 | Panora Robert ACOO and President | Option exercise X | +30,000 | 0.71 | 112,723 | Form 4 |
| 2025-06-16 | Panora Robert ACOO and President | Option exercise X | +52,500 | 1.10 | 165,223 | Form 4 |
| 2025-06-06 | Lafaille StephenVP of Business Development | Option exercise X | +25,000 | 1.10 | 25,400 | Form 4 |
| 2025-06-04 | Lafaille StephenVP of Business Development | Option exercise X | +15,000 | 0.71 | 15,400 | Form 4 |
| 2025-06-03 | Lafaille StephenVP of Business Development | Option exercise X | +10,000 | 0.71 | 10,400 | Form 4 |
| 2025-05-27 | Panora Robert ACOO and President | Option exercise M | +70,000 | 0.71 | 70,000 | Form 4/A |
| 2025-05-06 | Lewis Earl RDirector | Option exercise X | +15,000 | 1.75 | 982,256 | Form 4 |
| 2025-05-06 | Lewis Earl RDirector | Option exercise X | +12,500 | 1.20 | 994,756 | Form 4 |
| 2025-05-06 | Lewis Earl RDirector | Option exercise X | +6,250 | 1.10 | 1,001,006 | Form 4 |
| 2025-05-01 | Lewis Earl RDirector | Other J | +240,256 | 2.14 | 967,256 | Form 4 |
| 2024-11-22 | Lewis Earl RDirector | Option exercise X | +100,000 | 0.71 | 727,000 | Form 4/A |
How to read it
- Buy, sale
- Code P and S on the form: shares bought or sold in the market, at the market price. The other codes are mostly pay (a grant, an option exercised) or tax (shares the company withheld), and say little about what the insider thinks of the price.
- Plan
- A sale or purchase under a Rule 10b5-1 plan, set up in advance and running on its own schedule. Since April 2023 the form has a box for it. Much executive selling is planned and says more about diversifying than about the company.
- Holds after
- The shares the insider still held after the trade, in the form the trade was in (directly, or indirectly through a trust or a fund).
- Value
- Shares times the price the form reports, which is often an average over several fills on the day.
Read from the SEC's own quarterly data sets of Forms 3, 4 and 5, and from each day's filings since the last one. A correcting amendment replaces the lines it restates. Every row links to its filing. None of this is advice: insiders sell for many reasons, and buy for fewer.