TGEN Institutional Ownership & Shareholders
TECOGEN INC/WALTHAM MA (TGEN) is currently held by 66 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $46.70M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Portolan Capital Management, Llc is currently the largest disclosed institutional shareholder of TGEN tracked by InsiderSet, reporting ownership valued at approximately $8.10M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $2.79M, representing an estimated loss of -65.52% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 64% of the total disclosed TGEN value among the investors covered in this analysis. Major shareholders include Portolan Capital Management, Llc, Vanguard Capital Management Llc, Bard Associates Inc, and several other long-term asset managers with concentrated positions in TECOGEN INC/WALTHAM MA (TGEN).
This page ranks the largest institutional TGEN shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
66
Total Reported Value
$46.70M
Largest Holder
Portolan Capital Management, Llc
Largest Position
$8.10M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
95
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Portolan Capital Management, Llc | 0.30% | 1,551,113 | $8,096,810 | $2,792,003 | -$5,304,807 | -65.52% | |
| Vanguard Capital Management Llc | 0.00% | 788,670 | $4,116,857 | $1,419,606 | -$2,697,251 | -65.52% | |
| Bard Associates Inc | 0.79% | 682,221 | $3,561,194 | $1,227,998 | -$2,333,196 | -65.52% | |
| Clear Harbor Asset Management, Llc | 0.21% | 650,000 | $3,393,000 | $1,170,000 | -$2,223,000 | -65.52% | |
| Gratia Capital, Llc | 2.33% | 388,660 | $2,028,805 | $699,588 | -$1,329,217 | -65.52% | |
| Ubs Group Ag | 0.00% | 363,049 | $1,895,117 | $653,488 | -$1,241,629 | -65.52% | |
| Meros Investment Management, Lp | 0.59% | 353,487 | $1,845,202 | $636,277 | -$1,208,925 | -65.52% | |
| Palisades Investment Partners, Llc | 0.48% | 323,090 | $1,686,530 | $581,562 | -$1,104,968 | -65.52% | |
| Susquehanna International Group, Llp | 0.00% | 315,831 | $1,648,638 | $568,496 | -$1,080,142 | -65.52% | |
| Morgan Stanley | 0.00% | 301,695 | $1,574,848 | $543,051 | -$1,031,797 | -65.52% | |
| Raymond James Financial Inc | 0.00% | 290,260 | $1,515,157 | $522,468 | -$992,689 | -65.52% | |
| Blackrock, Inc. | 0.00% | 251,464 | $1,312,642 | $452,635 | -$860,007 | -65.52% | |
| Citadel Advisors Llc | 0.00% | 242,276 | $1,264,681 | $436,097 | -$828,584 | -65.52% | |
| Huntleigh Advisors, Inc. | 0.16% | 220,074 | $1,148,788 | $396,133 | -$752,655 | -65.52% | |
| Heartland Advisors Inc | 0.04% | 182,100 | $950,562 | $327,780 | -$622,782 | -65.52% | |
| Geode Capital Management, Llc | 0.00% | 180,870 | $944,802 | $325,566 | -$619,236 | -65.54% | |
| Thompson Davis & Co., Inc. | 0.45% | 144,840 | $755,856 | $260,712 | -$495,144 | -65.51% | |
| New York State Common Retirement Fund | 0.00% | 137,200 | $716,184 | $246,960 | -$469,224 | -65.52% | |
| Gsa Capital Partners Llp | 0.04% | 126,451 | $660,000 | $227,612 | -$432,388 | -65.51% | |
| Arosa Capital Management Lp | 0.57% | 125,000 | $652,500 | $225,000 | -$427,500 | -65.52% | |
| Integrated Wealth Concepts Llc | 0.00% | 112,080 | $585,058 | $201,744 | -$383,314 | -65.52% | |
| Apis Capital Advisors, Llc | 0.06% | 112,000 | $584,640 | $201,600 | -$383,040 | -65.52% | |
| Vanguard Fiduciary Trust Co | 0.00% | 105,956 | $553,090 | $190,721 | -$362,369 | -65.52% | |
| Goldman Sachs Group Inc | 0.00% | 69,530 | $362,946 | $125,154 | -$237,792 | -65.52% | |
| State Street Corp | 0.00% | 69,226 | $361,360 | $124,607 | -$236,753 | -65.52% | |
| Diametric Capital, Lp | 0.04% | 66,326 | $346,221 | $119,387 | -$226,834 | -65.52% | |
| Pfg Investments, Llc | 0.01% | 62,523 | $326,370 | $112,541 | -$213,829 | -65.52% | |
| Imc-Chicago, Llc | 0.00% | 61,800 | $322,596 | $111,240 | -$211,356 | -65.52% | |
| Hrt Financial Lp | 0.00% | 59,285 | $309,000 | $106,713 | -$202,287 | -65.47% | |
| Corsair Capital Management, L.P. | 0.04% | 55,017 | $287,189 | $99,031 | -$188,158 | -65.52% | |
| Marshall Wace, Llp | 0.00% | 54,806 | $286,087 | $98,651 | -$187,436 | -65.52% | |
| Group One Trading Llc | 0.01% | 49,872 | $260,332 | $89,770 | -$170,562 | -65.52% | |
| Gendell Jeffrey L | 0.00% | 49,823 | $260,076 | $89,681 | -$170,395 | -65.52% | |
| Jane Street Group, Llc | 0.00% | 49,087 | $256,234 | $88,357 | -$167,877 | -65.52% | |
| Gamco Investors, Inc. Et Al | 0.00% | 40,000 | $208,800 | $72,000 | -$136,800 | -65.52% | |
| Northern Trust Corp | 0.00% | 37,569 | $196,110 | $67,624 | -$128,486 | -65.52% | |
| Bridgeway Capital Management, Llc | 0.00% | 33,048 | $172,511 | $59,486 | -$113,025 | -65.52% | |
| Xtx Topco Ltd | 0.00% | 32,411 | $169,185 | $58,340 | -$110,845 | -65.52% | |
| Centiva Capital, Lp | 0.00% | 27,528 | $143,696 | $49,550 | -$94,146 | -65.52% | |
| Crewe Advisors Llc | 0.01% | 23,000 | $120,060 | $41,400 | -$78,660 | -65.52% | |
| Gabelli Funds Llc | 0.00% | 20,000 | $104,400 | $36,000 | -$68,400 | -65.52% | |
| Jefferies Financial Group Inc. | 0.00% | 19,300 | $100,746 | $34,740 | -$66,006 | -65.52% | |
| Virtu Financial Llc | 0.00% | 16,377 | $85,000 | $29,479 | -$55,521 | -65.32% | |
| D. E. Shaw & Co., Inc. | 0.00% | 15,339 | $80,070 | $27,610 | -$52,460 | -65.52% | |
| Belvedere Trading Llc | 0.01% | 15,206 | $79,375 | $27,371 | -$52,004 | -65.52% | |
| Quadrature Capital Ltd | 0.00% | 14,061 | $73,398 | $25,310 | -$48,088 | -65.52% | |
| Wealthspire Advisors, Llc | 0.00% | 11,711 | $61,131 | $21,080 | -$40,051 | -65.52% | |
| Dimensional Fund Advisors Lp | 0.00% | 11,163 | $58,270 | $20,093 | -$38,177 | -65.52% | |
| Pathstone Holdings, Llc | 0.00% | 18,725 | $47,936 | $33,705 | -$14,231 | -29.69% | |
| Commonwealth Equity Services, Llc | 0.00% | 15,124 | $42,950 | $27,223 | -$15,727 | -36.62% |
Frequently asked questions about TGEN
Who are the largest institutional holders of TGEN?
The largest institutional holders of TGEN reported in the latest SEC Form 13F filings include Portolan Capital Management, Llc, Vanguard Capital Management Llc, Bard Associates Inc, Clear Harbor Asset Management, Llc, and Gratia Capital, Llc. InsiderSet ranks institutional holders by their latest reported TGEN position.
What is TGEN institutional ownership?
This page tracks TGEN positions reported by institutional investment managers through SEC Form 13F. TECOGEN INC/WALTHAM MA (TGEN) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own TGEN?
InsiderSet currently tracks 66 institutional managers reporting TGEN holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of TGEN shareholders.
How much TGEN stock do institutions own?
Institutional investment managers disclosed approximately $46.70M in TGEN holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was TGEN institutional ownership last updated?
The latest TGEN institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional TGEN holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its TGEN position after the reporting date.
Are institutions buying or selling TGEN?
Institutional buying and selling can be analyzed by comparing TGEN positions across consecutive 13F reporting periods. InsiderSet's TGEN Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View TGEN ownership changes.
How has TGEN institutional ownership changed over time?
InsiderSet tracks TGEN institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.