Who owns TECOGEN INC., from the filings themselves: stakes over 5% (Schedule 13D/G), the institutional managers reporting the stock each quarter (13F), and the funds holding it (N-PORT).
Investors crossing 5% ownership must disclose it. Schedule 13G filers certify the stake is passive; Schedule 13D is the general form for everyone else — founders, strategic holders, and activists alike. Each entry is the holder's most recent disclosure. Coverage begins with SEC's structured filings from December 18, 2024; a holder appears once they file or amend after that date.
Portolan Capital Management, LLC: 5.2% · 1,552,232 shares — George McCabe: 5.2% · 1,552,232 shares
Tryfon Natsis and Depoina Pantopoulou, as Joint Tenants with the Right of Survivorship: 1.8% · 460,300 shares
Every institutional manager whose latest 13F reports this stock, largest position first. "% of their portfolio" is the weight inside that manager's own book — how much conviction the position represents; "% of company" is how much of TECOGEN INC. they hold. Together these 98 managers report 36.58% of shares outstanding.
| Investor | Position value | Shares | % of their portfolio | % of company | As of |
|---|---|---|---|---|---|
| Portolan Capital Management, LLC | $8.1M | 1,551,113 | 0.30% | 5.14% | June 30, 2026 |
| VANGUARD GROUP INC | $4.31M | 871,840 | 0.00% | 2.89% | December 31, 2025 |
96 more institutional holders behind a free account
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Sign up freeFunds disclosing this stock in their monthly N-PORT portfolio, with the position's share of the fund's net assets. Together these 20 funds hold 4.94% of shares outstanding — counted inside the manager totals above, not on top of them, since a fund's shares also appear in its manager's 13F.
| Fund | Position value | % of net assets | % of company | As of |
|---|---|---|---|---|
| VANGUARD TOTAL STOCK MARKET INDEX FUND | $3.03M | 0.00% | 1.92% | June 30, 2026 |
| Strategic Advisers U.S. Total Stock Fund | $1.1M | 0.00% | 1.05% | February 28, 2026 |
18 more funds behind a free account
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