TECOGEN INC/WALTHAM MA (TGEN) Institutional Shareholders
TECOGEN INC/WALTHAM MA (TGEN) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $49.22M in TGEN holdings during the latest filing period.
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 $4.84M, representing an estimated loss of -40.23% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 62% 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
65
Total Reported Value
$49.22M
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 | $4,839,473 | -$3,257,337 | -40.23% | |
| Vanguard Capital Management Llc | 0.00% | 788,670 | $4,116,857 | $2,460,650 | -$1,656,207 | -40.23% | |
| Bard Associates Inc | 0.79% | 682,221 | $3,561,194 | $2,128,530 | -$1,432,664 | -40.23% | |
| Clear Harbor Asset Management, Llc | 0.21% | 650,000 | $3,393,000 | $2,028,000 | -$1,365,000 | -40.23% | |
| Herald Investment Management Ltd | 0.30% | 420,000 | $2,188,200 | $1,310,400 | -$877,800 | -40.12% | |
| Gratia Capital, Llc | 2.33% | 388,660 | $2,028,805 | $1,212,619 | -$816,186 | -40.23% | |
| Ubs Group Ag | 0.00% | 363,049 | $1,895,117 | $1,132,713 | -$762,404 | -40.23% | |
| Meros Investment Management, Lp | 0.59% | 353,487 | $1,845,202 | $1,102,879 | -$742,323 | -40.23% | |
| Palisades Investment Partners, Llc | 0.48% | 323,090 | $1,686,530 | $1,008,041 | -$678,489 | -40.23% | |
| Susquehanna International Group, Llp | 0.00% | 315,831 | $1,648,638 | $985,393 | -$663,245 | -40.23% | |
| Morgan Stanley | 0.00% | 301,695 | $1,574,848 | $941,288 | -$633,560 | -40.23% | |
| Raymond James Financial Inc | 0.00% | 290,260 | $1,515,157 | $905,611 | -$609,546 | -40.23% | |
| Blackrock, Inc. | 0.00% | 251,464 | $1,312,642 | $784,568 | -$528,074 | -40.23% | |
| Citadel Advisors Llc | 0.00% | 242,276 | $1,264,681 | $755,901 | -$508,780 | -40.23% | |
| Huntleigh Advisors, Inc. | 0.16% | 220,074 | $1,148,788 | $686,631 | -$462,157 | -40.23% | |
| Heartland Advisors Inc | 0.04% | 182,100 | $950,562 | $568,152 | -$382,410 | -40.23% | |
| Geode Capital Management, Llc | 0.00% | 180,870 | $944,802 | $564,314 | -$380,488 | -40.27% | |
| Thompson Davis & Co., Inc. | 0.45% | 144,840 | $755,856 | $451,901 | -$303,955 | -40.21% | |
| New York State Common Retirement Fund | 0.00% | 137,200 | $716,184 | $428,064 | -$288,120 | -40.23% | |
| Gsa Capital Partners Llp | 0.04% | 126,451 | $660,000 | $394,527 | -$265,473 | -40.22% | |
| Arosa Capital Management Lp | 0.57% | 125,000 | $652,500 | $390,000 | -$262,500 | -40.23% | |
| Integrated Wealth Concepts Llc | 0.00% | 112,080 | $585,058 | $349,690 | -$235,368 | -40.23% | |
| Apis Capital Advisors, Llc | 0.06% | 112,000 | $584,640 | $349,440 | -$235,200 | -40.23% | |
| Vanguard Fiduciary Trust Co | 0.00% | 105,956 | $553,090 | $330,583 | -$222,507 | -40.23% | |
| Goldman Sachs Group Inc | 0.00% | 69,530 | $362,946 | $216,934 | -$146,012 | -40.23% | |
| State Street Corp | 0.00% | 69,226 | $361,360 | $215,985 | -$145,375 | -40.23% | |
| Diametric Capital, Lp | 0.04% | 66,326 | $346,221 | $206,937 | -$139,284 | -40.23% | |
| Pfg Investments, Llc | 0.01% | 62,523 | $326,370 | $195,072 | -$131,298 | -40.23% | |
| Imc-Chicago, Llc | 0.00% | 61,800 | $322,596 | $192,816 | -$129,780 | -40.23% | |
| Hrt Financial Lp | 0.00% | 59,285 | $309,000 | $184,969 | -$124,031 | -40.14% | |
| Corsair Capital Management, L.P. | 0.04% | 55,017 | $287,189 | $171,653 | -$115,536 | -40.23% | |
| Marshall Wace, Llp | 0.00% | 54,806 | $286,087 | $170,995 | -$115,092 | -40.23% | |
| Shikiar Asset Management Inc | 0.07% | 54,050 | $282,000 | $168,636 | -$113,364 | -40.20% | |
| Group One Trading Llc | 0.01% | 49,872 | $260,332 | $155,601 | -$104,731 | -40.23% | |
| Gendell Jeffrey L | 0.00% | 49,823 | $260,076 | $155,448 | -$104,628 | -40.23% | |
| Jane Street Group, Llc | 0.00% | 49,087 | $256,234 | $153,151 | -$103,083 | -40.23% | |
| Gamco Investors, Inc. Et Al | 0.00% | 40,000 | $208,800 | $124,800 | -$84,000 | -40.23% | |
| Northern Trust Corp | 0.00% | 37,569 | $196,110 | $117,215 | -$78,895 | -40.23% | |
| Bridgeway Capital Management, Llc | 0.00% | 33,048 | $172,511 | $103,110 | -$69,401 | -40.23% | |
| Xtx Topco Ltd | 0.00% | 32,411 | $169,185 | $101,122 | -$68,063 | -40.23% | |
| Centiva Capital, Lp | 0.00% | 27,528 | $143,696 | $85,887 | -$57,809 | -40.23% | |
| Crewe Advisors Llc | 0.01% | 23,000 | $120,060 | $71,760 | -$48,300 | -40.23% | |
| Gabelli Funds Llc | 0.00% | 20,000 | $104,400 | $62,400 | -$42,000 | -40.23% | |
| Jefferies Financial Group Inc. | 0.00% | 19,300 | $100,746 | $60,216 | -$40,530 | -40.23% | |
| Virtu Financial Llc | 0.00% | 16,377 | $85,000 | $51,096 | -$33,904 | -39.89% | |
| D. E. Shaw & Co., Inc. | 0.00% | 15,339 | $80,070 | $47,858 | -$32,212 | -40.23% | |
| Belvedere Trading Llc | 0.01% | 15,206 | $79,375 | $47,443 | -$31,932 | -40.23% | |
| Quadrature Capital Ltd | 0.00% | 14,061 | $73,398 | $43,870 | -$29,528 | -40.23% | |
| Commonwealth Equity Services, Llc | 0.00% | 13,624 | $71,120 | $42,507 | -$28,613 | -40.23% | |
| Wealthspire Advisors, Llc | 0.00% | 11,711 | $61,131 | $36,538 | -$24,593 | -40.23% |
Frequently asked questions about TGEN
Who owns the most TGEN stock?
The largest holders of TGEN are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for TECOGEN INC/WALTHAM MA (TGEN).
Is TGEN widely held by superinvestors?
Many widely followed stocks like TGEN appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly TGEN is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.