Tecogen's three largest insider shareholders as of September 09, 2026 are John Hatsopoulos (Co Chief Executive Officer, 1.04Mn shares), Earl Lewis (Director, 1.01Mn shares), Earl R Lewis (Director, 635.00K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | John Hatsopoulos | Co Chief Executive Officer | 1,038,951 | 0 | 1,038,951 | 37.0% | 23 Mar, 2026 |
| 2 | Earl Lewis | Director | 1,011,006 | 0 | 1,011,006 | 36.0% | 27 Mar, 2026 |
| 3 | Susan B Hirsch | Director | 265,416 | 0 | 265,416 | 9.5% | 14 Apr, 2026 |
| 4 | Abinand Rangesh | Chief Executive Officer | 241,274 | 0 | 241,274 | 8.6% | 08 Sep, 2026 |
| 5 | Roger P. Deschenes | Chief Financial Officer | 81,975 | 0 | 81,975 | 2.9% | 08 Sep, 2026 |
| 6 | Robert Panora | Coo And President | 72,194 | 0 | 72,194 | 2.6% | 08 Sep, 2026 |
| 7 | John Kimball Iv Whiting | General Counsel Secretary | 41,954 | 0 | 41,954 | 1.5% | 08 Sep, 2026 |
| 8 | Stephen Lafaille | Vp Of Business Development | 41,389 | 0 | 41,389 | 1.5% | 08 Sep, 2026 |
| 9 | Ahmed Ghoniem | Director | 12,723 | 0 | 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.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 26 Jun, 2026 | Robert Panora | Coo And President | Acquired A | 9,671 | $0.00 | $0 | 72,194 | Direct |
| 26 Jun, 2026 | John Kimball Iv Whiting | General Counsel Secretary | Acquired A | 19,342 | $0.00 | $0 | 41,954 | 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 | Robert Panora | Coo And President | Acquired A | 9,671 | — | — | 9,671 | Direct |
| 26 Jun, 2026 | John M Albertine | Director | Acquired A | 25,000 | $5.17 | $129.25K | 25,000 | Direct |
| 26 Jun, 2026 | Susan B Hirsch | Director | Acquired A | 25,000 | $5.17 | $129.25K | 25,000 | Direct |
| 26 Jun, 2026 | Earl Lewis | Director | Acquired A | 25,000 | $5.17 | $129.25K | 25,000 | Direct |
| 26 Jun, 2026 | Stephen Lafaille | Vp Of Business Development | Acquired A | 29,013 | — | — | 29,013 | 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 | 174,081 | — | — | 174,081 | Direct |
| 26 Jun, 2026 | John Kimball Iv Whiting | General Counsel Secretary | Acquired A | 19,342 | — | — | 19,342 | Direct |
| 26 Jun, 2026 | Angelina Galiteva | 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 | 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 |