Tecogen Inc. (TGEN) ownership: Top institutional holder: VANGUARD GROUP INC ($4.31M). Insider activity: Net Seller (3 buys, 17 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| VANGUARD GROUP INC | 871840.00 | $4.31M | 2025-12-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 769964.00 | $1.97M | 2026-03-31 |
| BARD ASSOCIATES INC | 688309.00 | $1.76M | 2026-03-31 |
| Clear Harbor Asset Management, LLC | 650000.00 | $1.66M | 2026-03-31 |
| Portolan Capital Management, LLC | 443555.00 | $1.14M | 2026-03-31 |
| HERALD INVESTMENT MANAGEMENT Ltd | 420000.00 | $1.08M | 2026-03-31 |
| Arosa Capital Management LP | 350000.00 | $896000.00 | 2026-03-31 |
| Palisades Investment Partners, LLC | 333907.00 | $854802.00 | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-26 | |
| Sell | null | 2026-06-26 | |
| Sell | null | 2026-06-26 | |
| Sell | null | 2026-06-26 | |
| Sell | null | 2026-06-26 | |
| Sell | null | 2026-06-26 | |
| Sell | null | 2026-06-26 | |
| Sell | null | 2026-06-26 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.