As of March 23, 2026, Tecogen's top three insider holders are John Hatsopoulos (Director, 988.95K shares), Susan B Hirsch (Director, 250.42K shares), Robert A Panora (Coo And President, 165.22K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| John Hatsopoulos | 1,038,951 | 0 | 23 Mar, 2026 | |
| Abinand Rangesh | Chief Executive Officer | 67,193 | 0 | 23 Mar, 2026 |
| Roger P. Deschenes | Cao | 52,962 | 0 | 23 Mar, 2026 |
| John Kimball Iv Whiting | General Counsel Secretary | 22,612 | 0 | 23 Mar, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 20 Mar, 2026 | Roger P. Deschenes | Common Stock | A | 10,000 | $2.23 | 52,962 | D | P |
| 20 Mar, 2026 | Abinand Rangesh | Common Stock | A | 3,000 | $2.30 | 67,193 | D | P |
| 23 Mar, 2026 | John Kimball Iv Whiting | Common Stock | A | 10,000 | $2.38 | 22,612 | D | P |
| 20 Mar, 2026 | John Hatsopoulos | Common Stock | A | 50,000 | $0.88 | 1,038,951 | D | M |
| 20 Mar, 2026 | John Hatsopoulos | Stock Option (Right to Buy) | D | 50,000 | $0.88 | 0 | D | M |
| 24 Jul, 2025 | John M Albertine | Stock Option (Right to Buy) | A | 25,000 | $8.35 | 175,000 | D | A |
| 24 Jul, 2025 | Roger P. Deschenes | Common Stock | A | 17,964 | $0.00 | 42,962 | D | A |
| 24 Jul, 2025 | John Kimball Iv Whiting | Common Stock | A | 11,976 | $0.00 | 12,612 | D | A |
| 24 Jul, 2025 | Abinand Rangesh | Common Stock | A | 53,892 | $0.00 | 64,193 | D | A |
| 24 Jul, 2025 | Roger P. Deschenes | Stock Option (Right to Buy) | A | 12,063 | $8.35 | 152,063 | D | A |
| 24 Jul, 2025 | John Kimball Iv Whiting | Stock Option (Right to Buy) | A | 24,075 | $8.35 | 424,075 | D | A |
| 24 Jul, 2025 | Abinand Rangesh | Stock Option (Right to Buy) | A | 24,075 | $8.35 | 294,075 | D | A |
| 24 Jul, 2025 | Abinand Rangesh | Stock Option (Right to Buy) | A | 12,048 | $8.35 | 306,123 | D | A |
| 27 Sep, 2024 | John Hatsopoulos | Common Stock | A | 10,000 | $0.84 | 988,951 | D | P |
| 25 Sep, 2024 | John Hatsopoulos | Common Stock | A | 10,000 | $0.86 | 978,951 | D | P |
| 19 Aug, 2024 | John Hatsopoulos | Common Stock | A | 10,000 | $0.90 | 968,951 | D | P |
| 10 Jul, 2024 | John Hatsopoulos | Common Stock | A | 22,466 | $0.65 | 958,951 | D | P |
| 06 Jun, 2024 | John M Albertine | Stock Option (Right to Buy) | A | 25,000 | $0.77 | 150,000 | D | A |
| 29 May, 2024 | John Hatsopoulos | Common Stock | A | 10,000 | $0.80 | 935,220 | D | P |
| 28 May, 2024 | John Hatsopoulos | Common Stock | A | 1,265 | $0.80 | 936,485 | D | P |