Tecogen Inc. (TGEN) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

30,442,100Shares Outstanding

297,309Shares held by institutions

$1,144,640Value of institutional holdings

25.51%Institutional ownership %

13.69%Shares Changed QoQ

64No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Tecogen Inc. (NYSE:TGEN) currently has 64 active institutional owners and shareholders as of today (December 2025), that have filed 13F forms with the Securities Exchange Commission (SEC).

Institutional ownership in Tecogen edged down to 25.5% in December 2025, compared to 25.8% in September 2025.
On a quarter-over-quarter basis, institutional holdings shifted by 13.69%, with a year-over-year an unavailable change in the count of filers.
Of these 64 institutional investors, 39 increased their holdings in Tecogen, while 14 of them reduced positions, and 11 investors maintained their exposure.
The total number of shares held by institutions in Tecogen increased to 7.77Mn as of December 2025, a net change of up by 935.02K shares quarter on quarter, and up 7.44Mn shares year over year.
VANGUARD GROUP INC's holding of 871.84K shares as of December 31, 2025 makes it the primary institutional investor in Tecogen, owning 2.86% of the stock.
Among the most significant buyers of Tecogen during December 2025 were MARSHALL WACE, LLP (237.24K), Caption Management, LLC (150.00K), JANE STREET GROUP, LLC (96.20K), UBS Group AG (95.37K), Point72 Asset Management, L.P. (83.91K).
Leading sellers of Tecogen stock in December 2025 included CITADEL ADVISORS LLC (164.79K), Portolan Capital Management, LLC (150.00K), GOLDMAN SACHS GROUP INC (65.04K), RENAISSANCE TECHNOLOGIES LLC (47.90K), ROYAL BANK OF CANADA (36.84K).
The top 10 institutional holders of Tecogen for the quarter ending December 2025 included VANGUARD GROUP INC (871.84K), BARD ASSOCIATES INC (689.11K), Clear Harbor Asset Management, LLC (610.00K), Portolan Capital Management, LLC (445.81K), HERALD INVESTMENT MANAGEMENT Ltd (420.00K), Palisades Investment Partners, LLC (390.21K), Arosa Capital Management LP (350.00K), JANE STREET GROUP, LLC (318.01K), SUSQUEHANNA INTERNATIONAL GROUP, LLP (302.91K), GENDELL JEFFREY L (295.54K).

64 Institutional Holders

297,309 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
VANGUARD GROUP INC	31 Dec, 2025	871,840	1,400	0.16%	$4,306,889.00
BARD ASSOCIATES INC	31 Dec, 2025	689,107	-1,504	-0.22%	$3,404,189.00
Clear Harbor Asset Management, LLC	31 Dec, 2025	610,000	-1,600	-0.26%	$3,013,400.00
Portolan Capital Management, LLC	31 Dec, 2025	445,810	-149,996	-25.18%	$2,202,301.00
HERALD INVESTMENT MANAGEMENT Ltd	31 Dec, 2025	420,000	-26,078	-5.85%	$2,083,200.00
Palisades Investment Partners, LLC	31 Dec, 2025	390,212	13,618	3.62%	$1,927,647.00
Arosa Capital Management LP	31 Dec, 2025	350,000	62,500	21.74%	$1,729,000.00
JANE STREET GROUP, LLC	31 Dec, 2025	318,007	96,197	43.37%	$1,570,954.00
SUSQUEHANNA INTERNATIONAL GROUP, LLP	31 Dec, 2025	302,911	50,876	20.19%	$1,496,380.00
GENDELL JEFFREY L	31 Dec, 2025	295,541	51,919	21.31%	$1,459,973.00
MARSHALL WACE, LLP	31 Dec, 2025	286,325	237,236	483.28%	$1,414,446.00
TWO SIGMA INVESTMENTS, LP	31 Dec, 2025	218,628	-28,077	-11.38%	$1,080,022.00
BlackRock, Inc.	31 Dec, 2025	191,360	6,581	3.56%	$945,318.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	177,914	11,357	6.82%	$879,452.00
Granahan Investment Management, LLC	31 Dec, 2025	177,822	65,484	58.29%	$878,441.00
Caption Management, LLC	31 Dec, 2025	150,000	150,000	0.00%	$741,000.00
NEW YORK STATE COMMON RETIREMENT FUND	31 Dec, 2025	137,200	0	0.00%	$677,768.00
HighTower Advisors, LLC	31 Dec, 2025	132,665	69,598	110.36%	$655,366.00
THOMPSON DAVIS & CO., INC.	31 Dec, 2025	120,450	2,497	2.12%	$595,023.00
UBS Group AG	31 Dec, 2025	104,959	95,371	994.69%	$518,498.00

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