Tecogen TGEN Institutional Ownership

NYSE TGEN

$2.08 -0.09 (-4.15%)

As of: Oct 22, 2026 · 3:59 PM EDT

Institutions by Trading Activity

69 Institutions

Increased 38 55.1%

Unchanged 16 23.2%

Reduced 15 21.7%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

31.42%

▲+5.39 pp QoQ

Shares Held by Institutions

9.48Mn

of 30.18Mn outstanding

▲+21.81% QoQ

Shares Outstanding

30.18Mn

20.70Mn held outside 13F filers

Institutional Investors

filed 13F for Jun 2026

▲+8 vs prior quarter

Net Shares Added (QoQ)

+1.70Mn

accumulated since last quarter

Value of Holdings

$20.76Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Updated Oct 10, 2026

Tecogen Inc. (NYSE:TGEN) had 69 institutional holders reporting a position on Form 13F for the quarter ended June 30, 2026.

Together they owned 31.42% of the outstanding stock in Q2 2026, up from 26.03% a quarter earlier.
Total shares held in TGEN rose 21.81% from Q1 2026; the number of holders rose 137.93% from Q2 2025.
Among the 69 holders of Tecogen, 38 added to their positions, 15 reduced their stakes and 16 left their positions unchanged.
The aggregate institutional position in Tecogen was 9.48Mn shares at the end of Q2 2026, up 1.7Mn from the prior quarter and up 5.62Mn from a year earlier.
As of June 30, 2026, the biggest holder of Tecogen was Portolan Capital Management, LLC with 1.55Mn shares, or 5.14% of shares outstanding.
The biggest increases in TGEN positions during Q2 2026 came from Portolan Capital Management, LLC (+1.11Mn shares), Morgan Stanley (+224.96K shares), Susquehanna International Group, LLP (+206.37K shares), Raymond James Financial Inc (+104.47K shares) and Citadel Advisors LLC (+94.8K shares).
Among holders that kept a stake in Tecogen, the biggest sellers in Q2 2026 were Arosa Capital Management LP (-225K shares), Jeffrey L. Gendell (-195.72K shares), Marshall Wace, LLP (-152.66K shares), Integrated Wealth Concepts LLC (-106.3K shares) and HighTower Advisors, LLC (-93.17K shares).
Tecogen's 10 largest institutional shareholders as of Q2 2026 were Portolan Capital Management, LLC (1.55Mn shares), Vanguard Capital Management LLC (788.67K shares), Bard Associates Inc (682.22K shares), Clear Harbor Asset Management, LLC (650K shares), Herald Investment Management Ltd (420K shares), Gratia Capital, LLC (388.66K shares), UBS Group AG (363.05K shares), Meros Investment Management, LP (353.49K shares), Palisades Investment Partners, LLC (323.09K shares) and Susquehanna International Group, LLP (315.83K shares), per Business Quant data.

Form 13F Holdings

69 Institutional Holders

Report period 30 Jun, 2026

Total shares held 9.48Mn

Of outstanding 31.42%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	Portolan Capital Management, LLC	0001350290	1,551,113	5.14%	▲1,107,558	+249.70%	$8.10Mn
2	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	788,670	2.61%	▲18,706	+2.43%	$4.12Mn
3	BARD ASSOCIATES INC	0001105907	682,221	2.26%	▼6,088	-0.88%	$3.56Mn
4	Clear Harbor Asset Management, LLC	0001511857	650,000	2.15%	0	0.00%	$3.39Mn
5	HERALD INVESTMENT MANAGEMENT Ltd	0001512022	420,000	1.39%	0	0.00%	$2.19Mn
6	GRATIA CAPITAL, LLC	0001599793	388,660	1.29%	▲388,660	0.00%	$2.03Mn
7	UBS Group AG	0001610520	363,049	1.20%	▲43,213	+13.51%	$1.90Mn
8	Meros Investment Management, LP	0001911372	353,487	1.17%	▲61,782	+21.18%	$1.85Mn
9	Palisades Investment Partners, LLC	0001427373	323,090	1.07%	▼10,817	-3.24%	$1.69Mn
10	SUSQUEHANNA INTERNATIONAL GROUP, LLP	0001446194	315,831	1.05%	▲206,374	+188.54%	$1.65Mn
11	Morgan Stanley	0000895421	301,695	1.00%	▲224,959	+293.16%	$1.57Mn
12	Raymond James Financial Inc	0000720005	290,260	0.96%	▲104,466	+56.23%	$1.52Mn
13	BlackRock, Inc.	0002012383	251,464	0.83%	▲66,685	+36.09%	$1.31Mn
14	CITADEL ADVISORS LLC	0001423053	242,276	0.80%	▲94,804	+64.29%	$1.26Mn
15	Huntleigh Advisors, Inc.	0001367653	220,074	0.73%	▲220,074	0.00%	$1.15Mn
16	HEARTLAND ADVISORS INC	0000937394	182,100	0.60%	▲182,100	0.00%	$950.56K
17	GEODE CAPITAL MANAGEMENT, LLC	0001214717	180,870	0.60%	▼11,132	-5.80%	$944.80K
18	THOMPSON DAVIS & CO., INC.	0001017284	144,840	0.48%	▲45,840	+46.30%	$755.86K
19	NEW YORK STATE COMMON RETIREMENT FUND	0000810265	137,200	0.45%	0	0.00%	$716.18K
20	GSA CAPITAL PARTNERS LLP	0001362033	126,451	0.42%	▲32,281	+34.28%	$660

Showing 1 to 20 of 69 holders