TGEN · Tecogen Inc. · Holdings

$3.23 +0.10 (+3.19%) At close · Sep 8

Market Cap

$94.49M

30.19M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Use institutional holdings through the 13F API or MCP →

Quarter:

Holders: 70

Total Value: $56,948,074

Total Shares: 10,909,599

Institutional Ownership Trend

22 quarters

Superinvestors Holding TGEN

All superinvestors →

Mario Gabelli $208,800

Holder Concentration

Across 70 13F filers · Δ vs Mar 31, 2026

Top Holder

14.2%

+5.2 pts

Top 5

39.0%

+3.4 pts

Top 10

59.7%

+2.3 pts

HHI

517

Broadly held+77

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: +8

Institutional value: +161.2%

Shares held: +28.1%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Mid Portolan Capital Management, LLC	+1,107,558	1,551,113
Mega JANE STREET GROUP, LLC	+243,145	434,287
Mega MORGAN STANLEY	+224,959	301,695
Mega CITADEL ADVISORS LLC	+155,504	585,576
Mega RAYMOND JAMES FINANCIAL INC	+104,466	290,260

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Small Arosa Capital Management LP	−225,000	125,000
Large GENDELL JEFFREY L	−195,718	49,823
Large MARSHALL WACE, LLP	−152,661	54,806
Mid Integrated Wealth Concepts LLC	−106,300	112,080
Large HighTower Advisors, LLC	−93,165	39,500

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Large PEAK6 LLC	471,900	$2,463,318
Small GRATIA CAPITAL, LLC	388,660	$2,028,805
Small Huntleigh Advisors, Inc.	220,074	$1,148,786
Mid HEARTLAND ADVISORS INC	182,100	$950,562
Mid XTX Topco Ltd	32,411	$169,185

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Large RENAISSANCE TECHNOLOGIES LLC	272,300	$697,088
Mid Granahan Investment Management, LLC	88,496	$226,549
Mega TWO SIGMA INVESTMENTS, LP	67,418	$172,590
Mega LPL Financial LLC	41,251	$105,602
Mid HARBOR CAPITAL ADVISORS, INC.	39,973	$102,330

Filter: New 21 Increased 19 Reduced 14 Sold out 13 Unchanged 16

Showing 77 of 77

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

Portolan Capital Management, LLC

$8,096,809

14.22%

1,551,113

VANGUARD CAPITAL MANAGEMENT LLC

$4,116,857

7.23%

788,670

BARD ASSOCIATES INC

$3,561,193

6.25%

682,221

Clear Harbor Asset Management, LLC

$3,393,000

5.96%

650,000

PEAK6 LLC

$2,463,318

4.33%

471,900

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
PEAK6 Investments LLC joint	471,900	$2,463,318	100.0%	Defined

HERALD INVESTMENT MANAGEMENT Ltd

$2,192,400

3.85%

420,000

GRATIA CAPITAL, LLC

$2,028,805

3.56%

388,660

UBS Group AG

$1,895,115

3.33%

363,049

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS AG	361,355	$1,886,273	99.5%	Defined
UBS Switzerland AG	3	$15	0.0%	Defined
UBS Securities LLC	1,691	$8,827	0.5%	Defined

Meros Investment Management, LP

$1,845,202

3.24%

353,487

Palisades Investment Partners, LLC

$1,686,529

2.96%

323,090

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$1,648,637

2.89%

315,831

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	315,831	$1,648,637	100.0%	Other

JANE STREET GROUP, LLC

$1,585,836

2.78%

303,800

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	303,800	$1,585,836	100.0%	Defined

MORGAN STANLEY

$1,574,847

2.77%

301,695

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY CAPITAL SERVICES, LLC	9,228	$48,170	3.1%	Defined
MORGAN STANLEY SMITH BARNEY LLC	292,467	$1,526,677	96.9%	Defined

RAYMOND JAMES FINANCIAL INC

$1,515,157

2.66%

290,260

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Raymond James Financial Services Advisors, Inc.	290,260	$1,515,157	100.0%	Defined

BlackRock, Inc.

$1,312,640

2.30%

251,464

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BlackRock Investment Management, LLC	4,158	$21,704	1.7%	Sole
BlackRock Fund Advisors	62,527	$326,390	24.9%	Sole
BlackRock Institutional Trust Company, N.A.	184,779	$964,546	73.5%	Sole

CITADEL ADVISORS LLC

$1,264,680

2.22%

242,276

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	242,050	$1,263,501	99.9%	Defined
Held directly	226	$1,179	0.1%	Defined

Huntleigh Advisors, Inc.

$1,148,786

2.02%

220,074

CITADEL ADVISORS LLC

$1,143,702

2.01%

219,100

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	219,100	$1,143,702	100.0%	Defined

HEARTLAND ADVISORS INC

$950,562

1.67%

182,100

GEODE CAPITAL MANAGEMENT, LLC

$944,140

1.66%

180,870

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	38,425	$200,578	21.2%	Defined
Held directly	142,445	$743,562	78.8%	Defined

THOMPSON DAVIS & CO., INC.

$756,064

1.33%

144,840

NEW YORK STATE COMMON RETIREMENT FUND

$716,184

1.26%

137,200

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$685,386

1.20%

131,300

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	131,300	$685,386	100.0%	Other

GSA CAPITAL PARTNERS LLP

$660,074

1.16%

126,451

Arosa Capital Management LP

$652,500

1.15%

125,000

CITADEL ADVISORS LLC

$648,324

1.14%

124,200

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	124,200	$648,324	100.0%	Defined

Integrated Wealth Concepts LLC

$585,057

1.03%

112,080

Apis Capital Advisors, LLC

$584,640

1.03%

112,000

VANGUARD FIDUCIARY TRUST CO

$553,090

0.97%

105,956

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$461,970

0.81%

88,500

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	88,500	$461,970	100.0%	Other

JANE STREET GROUP, LLC

$424,908

0.75%

81,400

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	81,400	$424,908	100.0%	Defined

GOLDMAN SACHS GROUP INC

$362,946

0.64%

69,530

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GOLDMAN SACHS & CO. LLC	17,370	$90,671	25.0%	Defined
GOLDMAN SACHS ASSET MANAGEMENT, L.P.	52,160	$272,275	75.0%	Defined

STATE STREET CORP

$361,359

0.63%

69,226

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STATE STREET GLOBAL ADVISORS TRUST COMPANY	69,226	$361,359	100.0%	Defined

Diametric Capital, LP

$346,221

0.61%

66,326

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Thakore Nainoor	66,326	$346,221	100.0%	Defined

PFG Investments, LLC

$326,370

0.57%

62,523

IMC-Chicago, LLC

$322,596

0.57%

61,800

HRT FINANCIAL LP

$309,467

0.54%

59,285

CORSAIR CAPITAL MANAGEMENT, L.P.

$287,188

0.50%

55,017

MARSHALL WACE, LLP

$286,086

0.50%

54,806

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Marshall Wace North America L.P. joint	54,806	$286,086	100.0%	Other

SHIKIAR ASSET MANAGEMENT INC

$282,141

0.50%

54,050

GROUP ONE TRADING LLC

$260,331

0.46%

49,872

GENDELL JEFFREY L

$260,076

0.46%

49,823

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Tontine Asset Management, LLC	49,823	$260,076	100.0%	Defined

JANE STREET GROUP, LLC

$256,233

0.45%

49,087

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	14,895	$77,751	30.3%	Defined
Jane Street Global Trading, LLC	34,192	$178,482	69.7%	Defined

GAMCO INVESTORS, INC. ET AL

$208,800

0.37%

40,000

HighTower Advisors, LLC

$206,190

0.36%

39,500

NORTHERN TRUST CORP

$196,110

0.34%

37,569

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	37,569	$196,110	100.0%	Defined

BRIDGEWAY CAPITAL MANAGEMENT, LLC

$172,510

0.30%

33,048

XTX Topco Ltd

$169,185

0.30%

32,411

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	32,411	$169,185	100.0%	Defined

Centiva Capital, LP

$143,696

0.25%

27,528

Crewe Advisors LLC

$120,060

0.21%

23,000

GABELLI FUNDS LLC

$104,400

0.18%

20,000

Jefferies Financial Group Inc.

$100,746

0.18%

19,300

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
JEFFERIES LLC	19,300	$100,746	100.0%	Defined

Pathstone Holdings, LLC

$97,744

0.17%

18,725

Virtu Financial LLC

$85,487

0.15%

16,377

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Virtu Americas LLC	16,377	$85,487	100.0%	Defined

D. E. Shaw & Co., Inc.

$80,069

0.14%

15,339

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
D. E. SHAW & CO, L.P.	15,339	$80,069	100.0%	Defined

Belvedere Trading LLC

$79,375

0.14%

15,206

Quadrature Capital Ltd

$73,398

0.13%

14,061

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Quadrature US Inc.	14,061	$73,398	100.0%	Other

COMMONWEALTH EQUITY SERVICES, LLC

$71,117

0.12%

13,624

Wealthspire Advisors, LLC

$61,131

0.11%

11,711

DIMENSIONAL FUND ADVISORS LP

$58,270

0.10%

11,163

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Dimensional Ireland Ltd	2	$10	0.0%	Defined
Held directly	11,161	$58,260	100.0%	Sole

CITIZENS FINANCIAL GROUP INC/RI

$52,200

0.09%

10,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
CITIZENS PRIVATE WEALTH, LLC	10,000	$52,200	100.0%	Defined

Belvedere Trading LLC

$42,282

0.07%

8,100

Vanguard Global Advisers, LLC

$28,365

0.05%

5,434

Persistent Asset Partners Ltd

$11,854

0.02%

2,271

CITIGROUP INC

$8,362

0.01%

1,602

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citigroup Financial Products Inc. joint	1,602	$8,362	100.0%	Defined

UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC

$8,263

0.01%

1,583

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Group AG	1,583	$8,263	100.0%	Defined

Federation des caisses Desjardins du Quebec

$2,933

0.01%

562

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Desjardins Securities inc.	562	$2,933	100.0%	Defined

SIMPLEX TRADING, LLC

$2,500

0.00%

479

NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO

$1,388

0.00%

266

ROYAL BANK OF CANADA

$1,184

0.00%

227

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RBC Capital Markets, LLC	200	$1,044	88.2%	Defined
Held directly	27	$140	11.8%	Sole

Fortitude Family Office, LLC

$944

0.00%

181

Bogart Wealth, LLC

$615

0.00%

118

SBI Securities Co., Ltd.

$574

0.00%

110

Bare Financial Services, Inc

$537

0.00%

103

FMR LLC

$276

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STRATEGIC ADVISERS LLC	53	$276	100.0%	Defined

HOLLENCREST CAPITAL MANAGEMENT

$78

0.00%

Caitong International Asset Management Co., Ltd

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Leap GP LLC joint	35,500	$90,880	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Latour Trading LLC (Latour)	10,189	$26,083	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
National Bank Financial Inc.	500	$1,280	100.0%	Defined

Key facts CIK 1537435 CUSIP 87876P201 13F (30d) 46 filings 46 filers Visit website Investor relations