TECOGEN INC/WALTHAM MA (TGEN) Institutional Ownership Changes & 13F Activity
TECOGEN INC/WALTHAM MA (TGEN). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q2 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Portolan Capital Management, Llc, Gratia Capital, Llc, Arosa Capital Management Lp, Morgan Stanley, and Susquehanna International Group, Llp.
| Institution | Type | Change in shares | Change Position % | Shares | Reported stock balance | Portfolio quarter | Filing date |
|---|---|---|---|---|---|---|---|
| Integrated Wealth Concepts Llc | Sell | -106,300 | -48.7% | 112,080 | $585.06K | Q2 2026 | Sep 09, 2026 |
| Citadel Advisors Llc | Buy | +94,804 | +64.3% | 242,276 | $1.26M | Q2 2026 | Sep 02, 2026 |
| Jefferies Financial Group Inc. | Buy | +19,300 | — | 19,300 | $100.75K | Q2 2026 | Aug 17, 2026 |
| Portolan Capital Management, Llc | Buy | +1,107,558 | +249.7% | 1,551,113 | $8.10M | Q2 2026 | Aug 14, 2026 |
| Gratia Capital, Llc | Buy | +388,660 | — | 388,660 | $2.03M | Q2 2026 | Aug 14, 2026 |
| Arosa Capital Management Lp | Sell | -225,000 | -64.3% | 125,000 | $652.50K | Q2 2026 | Aug 14, 2026 |
| Susquehanna International Group, Llp | Buy | +206,374 | +188.5% | 315,831 | $1.65M | Q2 2026 | Aug 14, 2026 |
| Gendell Jeffrey L | Sell | -195,718 | -79.7% | 49,823 | $260.08K | Q2 2026 | Aug 14, 2026 |
| Raymond James Financial Inc | Buy | +104,466 | +56.2% | 290,260 | $1.52M | Q2 2026 | Aug 14, 2026 |
| Jane Street Group, Llc | Sell | -68,255 | -58.2% | 49,087 | $256.23K | Q2 2026 | Aug 14, 2026 |
| Meros Investment Management, Lp | Buy | +61,782 | +21.2% | 353,487 | $1.85M | Q2 2026 | Aug 14, 2026 |
| Goldman Sachs Group Inc | Buy | +44,424 | +176.9% | 69,530 | $362.95K | Q2 2026 | Aug 14, 2026 |
| Hrt Financial Lp | Buy | +44,214 | +293.4% | 59,285 | $309.00K | Q2 2026 | Aug 14, 2026 |
| Apis Capital Advisors, Llc | Buy | +35,000 | +45.5% | 112,000 | $584.64K | Q2 2026 | Aug 14, 2026 |
| Group One Trading Llc | Sell | -34,050 | -40.6% | 49,872 | $260.33K | Q2 2026 | Aug 14, 2026 |
| Xtx Topco Ltd | Buy | +32,411 | — | 32,411 | $169.19K | Q2 2026 | Aug 14, 2026 |
| D. E. Shaw & Co., Inc. | Buy | +15,339 | — | 15,339 | $80.07K | Q2 2026 | Aug 14, 2026 |
| Diametric Capital, Lp | Buy | +13,195 | +24.8% | 66,326 | $346.22K | Q2 2026 | Aug 14, 2026 |
| Royal Bank Of Canada | Sell | -2,916 | -92.8% | 227 | $1.00K | Q2 2026 | Aug 14, 2026 |
| Morgan Stanley | Buy | +224,959 | +293.2% | 301,695 | $1.57M | Q2 2026 | Aug 13, 2026 |
| Marshall Wace, Llp | Sell | -152,661 | -73.6% | 54,806 | $286.09K | Q2 2026 | Aug 13, 2026 |
| Ubs Group Ag | Buy | +43,213 | +13.5% | 363,049 | $1.90M | Q2 2026 | Aug 13, 2026 |
| Centiva Capital, Lp | Buy | +27,528 | — | 27,528 | $143.70K | Q2 2026 | Aug 13, 2026 |
| Vanguard Capital Management Llc | Buy | +18,706 | +2.4% | 788,670 | $4.12M | Q2 2026 | Aug 13, 2026 |
| Virtu Financial Llc | Buy | +16,377 | — | 16,377 | $85.00K | Q2 2026 | Aug 13, 2026 |
| Vanguard Fiduciary Trust Co | Buy | +9,514 | +9.9% | 105,956 | $553.09K | Q2 2026 | Aug 13, 2026 |
| Northern Trust Corp | Sell | -112 | -0.3% | 37,569 | $196.11K | Q2 2026 | Aug 13, 2026 |
| Fmr Llc | Buy | +53 | — | 53 | $279.00 | Q2 2026 | Aug 13, 2026 |
| Hollencrest Capital Management | Buy | +15 | — | 15 | $78.00 | Q2 2026 | Aug 13, 2026 |
| Simplex Trading, Llc | Sell | -40,853 | -98.8% | 479 | $2.50K | Q2 2026 | Aug 12, 2026 |
Frequently asked questions about TGEN activity
Which institutional owners are buying TGEN?
Institutional owners buying TGEN include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in TGEN activity?
"Buy" means an investor increased their reported position in TGEN compared to the prior reporting period. This reflects growing exposure to TECOGEN INC/WALTHAM MA (TGEN) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in TGEN increasing?
Institutional interest in TGEN can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.