TGEN
TECOGEN INC.
Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig EquipNYSENon-accelerated filer<br>Smaller reporting company
Total Trades
78
Buys
77
Sells
1
Largest Trade
$100K–$500K
Insiders
5
Institutional Funds
51
Inst. Value
$1M+
Activist Filings
2
Insider Trades
| Insider | Title | Type | Value | Shares | Price | Date |
|---|---|---|---|---|---|---|
| Lafaille Stephen | VP of Business Dev… | SELL | $100K–$500K | 60K | $5.76 | Jun 24, 2025 |
| Lafaille Stephen | VP of Business Dev… | BUY | $1K–$15K | 400 | $2.50 | Jun 24, 2025 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 10K | $0.84 | Sep 27, 2024 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 10K | $0.86 | Sep 25, 2024 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 10K | $0.90 | Aug 20, 2024 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 1K | $0.80 | May 29, 2024 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 10K | $0.80 | May 29, 2024 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 12K | $0.80 | May 28, 2024 |
| LEWIS EARL R | Director | BUY | $1K–$15K | 5K | $0.75 | May 3, 2024 |
| LEWIS EARL R | Director | BUY | $1K–$15K | 10K | $0.68 | Apr 24, 2024 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 5K | $0.67 | Apr 24, 2024 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 6K | $0.68 | Apr 23, 2024 |
| HATSOPOULOS JOHN | Director | BUY | <$1K | 1K | $0.68 | Apr 16, 2024 |
| HATSOPOULOS JOHN | Director | BUY | <$1K | 1K | $0.70 | Apr 16, 2024 |
| HATSOPOULOS JOHN | Director | BUY | <$1K | 1K | $0.70 | Apr 12, 2024 |
| HATSOPOULOS JOHN | Director | BUY | <$1K | 1K | $0.70 | Apr 11, 2024 |
| HATSOPOULOS JOHN | Director | BUY | <$1K | 1K | $0.70 | Apr 9, 2024 |
| HATSOPOULOS JOHN | Director | BUY | <$1K | 1K | $0.70 | Apr 8, 2024 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 10K | $0.70 | Apr 2, 2024 |
| LEWIS EARL R | Director | BUY | $1K–$15K | 9K | $0.78 | Jan 25, 2024 |
| LEWIS EARL R | Director | BUY | $1K–$15K | 10K | $0.68 | Jan 23, 2024 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 10K | $0.77 | Jan 23, 2024 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 10K | $0.73 | Jan 19, 2024 |
| HATSOPOULOS JOHN | Director | BUY | $50K–$100K | 100K | $0.73 | Jan 16, 2024 |
| HATSOPOULOS JOHN | Director | BUY | $15K–$50K | 25K | $0.80 | Dec 28, 2023 |
| HATSOPOULOS JOHN | Director | BUY | $15K–$50K | 25K | $0.80 | Dec 26, 2023 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 4K | $0.84 | Nov 21, 2023 |
| HATSOPOULOS JOHN | Director | BUY | $15K–$50K | 46K | $0.84 | Nov 17, 2023 |
| HATSOPOULOS JOHN | Director | BUY | <$1K | 100 | $0.84 | Nov 17, 2023 |
| Hirsch Susan B | Director | BUY | $1K–$15K | 5K | $0.92 | Oct 20, 2023 |
| LEWIS EARL R | Director | BUY | $15K–$50K | 25K | $0.91 | Oct 18, 2023 |
| HATSOPOULOS JOHN | Director | BUY | $15K–$50K | 50K | $0.80 | Oct 17, 2023 |
| HATSOPOULOS JOHN | Director | BUY | $15K–$50K | 50K | $0.80 | Oct 13, 2023 |
| LEWIS EARL R | Director | BUY | $1K–$15K | 2K | $0.80 | Oct 11, 2023 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 2K | $0.98 | Oct 2, 2023 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 1K | $0.91 | Sep 28, 2023 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 2K | $0.92 | Sep 27, 2023 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 5K | $0.91 | Sep 19, 2023 |
| LEWIS EARL R | Director | BUY | $1K–$15K | 10K | $0.95 | Sep 11, 2023 |
| HATSOPOULOS JOHN | Director | BUY | <$1K | 200 | $1.00 | Sep 8, 2023 |
| LEWIS EARL R | Director | BUY | $1K–$15K | 10K | $1.00 | Sep 6, 2023 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 10K | $0.97 | Sep 6, 2023 |
| Rangesh Abinand | CEO | BUY | $1K–$15K | 1K | $1.02 | Sep 1, 2023 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 5K | $1.12 | Aug 23, 2023 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 10K | $1.02 | Aug 17, 2023 |
| LEWIS EARL R | Director | BUY | $1K–$15K | 2K | $1.00 | Aug 17, 2023 |
| HATSOPOULOS JOHN | Director | BUY | <$1K | 1K | $0.96 | Jun 27, 2023 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 3K | $1.00 | Jun 21, 2023 |
| Rangesh Abinand | CEO | BUY | $1K–$15K | 2K | $1.04 | Jun 20, 2023 |
| HATSOPOULOS JOHN | Director | BUY | $1K–$15K | 5K | $1.11 | Jun 15, 2023 |
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Institutional Ownership
13F filings as of Dec 31, 2025 · 51 funds holding
| Fund | Shares | Value | Type |
|---|---|---|---|
| BARD ASSOCIATES INC | 689K | $1M+ | SH |
| Clear Harbor Asset Management, LLC | 610K | $1M+ | SH |
| Portolan Capital Management, LLC | 446K | $1M+ | SH |
| HERALD INVESTMENT MANAGEMENT Ltd | 420K | $1M+ | SH |
| Palisades Investment Partners, LLC | 390K | $1M+ | SH |
| GENDELL JEFFREY L | 296K | $1M+ | SH |
| GEODE CAPITAL MANAGEMENT, LLC | 141K | $500K+ | SH |
| NEW YORK STATE COMMON RETIREMENT FUND | 137K | $500K+ | SH |
| HighTower Advisors, LLC | 133K | $500K+ | SH |
| THOMPSON DAVIS & CO., INC. | 120K | $500K+ | SH |
| UBS Group AG | 102K | $500K+ | SH |
| RAYMOND JAMES FINANCIAL INC | 100K | $100K–$500K | SH |
| JANE STREET GROUP, LLC | 85K | $100K–$500K | SH |
| Point72 Asset Management, L.P. | 84K | $100K–$500K | SH |
| LPL Financial LLC | 74K | $100K–$500K | SH |
| STATE STREET CORP | 69K | $100K–$500K | SH |
| GOLDMAN SACHS GROUP INC | 68K | $100K–$500K | SH |
| PFG Investments, LLC | 63K | $100K–$500K | SH |
| GROUP ONE TRADING LLC | 57K | $100K–$500K | SH |
| RENAISSANCE TECHNOLOGIES LLC | 54K | $100K–$500K | SH |
Activist & 5%+ Owners
SC 13D/13G filings — investors holding 5%+ of outstanding shares
Tryfon Natsis and Depoina Pantopoulou, as Joint Tenants with the Right of Survivorship
SC 13G/A · Aug 14, 2025
1.8%
460K shares
SC 13G · May 10, 2022
14.9%
3.7M shares