TGEN · Tecogen Inc. · Shareholders & Ownership

$2.13 +0.01 (+0.47%) At close · Oct 20

Market Cap

$64.00M

30.19M

Volume · Oct 20 57.3K Avg daily vol (3M) 180.18K

Every disclosed holder of TGEN in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns TGEN

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	69	9,492,299	31.44%	Yes
Insiders (Forms 3, 4, 5)	9	2,806,882	9.30%	Yes
13D/G-only blocks	1	460,300	1.52%	Yes
Remaining	—	17,428,341	57.73%	Rest
Registered funds (N-PORT, not summed)	17	1,885,279	6.25%	No

Shares outstanding: 30,187,822, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of TGEN

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	Portolan Capital Management, LLC 13F CIK 1350290 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,551,113	5.14%	+1,107,558	Jun 30, 2026	carried, not yet filed for the newest quarter
2	Hatsopoulos John Insider CIK 1274775 · Mar 20, 2026 Director, issuer-wide	1,038,951	3.44%	+50,000	Mar 20, 2026	Director, issuer-wide
3	Lewis Earl Insider CIK 1230427 · Mar 27, 2026 Director, issuer-wide	1,011,006	3.35%	+5,000	Mar 27, 2026	Director, issuer-wide
4	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	788,670	2.61%	+18,706	Jun 30, 2026	carried, not yet filed for the newest quarter
5	BARD ASSOCIATES INC 13F CIK 1105907 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	682,221	2.26%	-6,088	Jun 30, 2026	carried, not yet filed for the newest quarter
6	Clear Harbor Asset Management, LLC 13F CIK 1511857 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	650,000	2.15%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
7	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	579,798	1.92%	0	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
8	Tryfon Natsis and Depoina Pantopoulou, as Joint Tenants with the Right of Survivorship 13G CIK 1674697 · Unknown · Jun 30, 2025 Rule 13d-1(c), passive investor	460,300	1.52%	—	Jun 30, 2025	Rule 13d-1(c), passive investor
9	HERALD INVESTMENT MANAGEMENT Ltd 13F CIK 1512022 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	420,000	1.39%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
10	GRATIA CAPITAL, LLC 13F CIK 1599793 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	388,660	1.29%	+388,660	Jun 30, 2026	carried, not yet filed for the newest quarter
11	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	363,049	1.20%	+43,213	Jun 30, 2026	carried, not yet filed for the newest quarter
12	Meros Investment Management, LP 13F CIK 1911372 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	353,487	1.17%	+61,782	Jun 30, 2026	carried, not yet filed for the newest quarter
13	Palisades Investment Partners, LLC 13F CIK 1427373 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	323,090	1.07%	-10,817	Jun 30, 2026	carried, not yet filed for the newest quarter
14	SUSQUEHANNA INTERNATIONAL GROUP, LLP 13F CIK 1446194 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	315,831	1.05%	+206,374	Jun 30, 2026	carried, not yet filed for the newest quarter
15	MORGAN STANLEY 13F CIK 895421 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	301,695	1.00%	+224,959	Jun 30, 2026	carried, not yet filed for the newest quarter
16	RAYMOND JAMES FINANCIAL INC 13F CIK 720005 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	290,260	0.96%	+104,466	Jun 30, 2026	carried, not yet filed for the newest quarter
17	Hirsch Susan B Insider CIK 1827663 · Apr 13, 2026 Director, issuer-wide	265,416	0.88%	+5,000	Apr 13, 2026	Director, issuer-wide
18	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	251,464	0.83%	+66,685	Jun 30, 2026	carried, not yet filed for the newest quarter
18.1	iShares Micro-Cap ETF Fund S000004439 · Registered fund · Jun 30, 2026 iShares Trust, not summed	62,527	0.21%	—	Jun 30, 2026	iShares Trust, not summed
19	CITADEL ADVISORS LLC 13F CIK 1423053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	242,276	0.80%	+94,804	Jun 30, 2026	carried, not yet filed for the newest quarter
20	Rangesh Abinand Insider CIK 1917503 · Jun 26, 2026 Director, Chief Executive Officer, issuer-wide	241,274	0.80%	+174,081	Jun 26, 2026	Director, Chief Executive Officer, issuer-wide
21	Huntleigh Advisors, Inc. 13F CIK 1367653 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	220,074	0.73%	+220,074	Jun 30, 2026	carried, not yet filed for the newest quarter
22	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	189,154	0.63%	+18,706	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
23	HEARTLAND ADVISORS INC 13F CIK 937394 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	182,100	0.60%	+182,100	Jun 30, 2026	carried, not yet filed for the newest quarter
24	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	180,870	0.60%	-11,132	Jun 30, 2026	carried, not yet filed for the newest quarter
25	THOMPSON DAVIS & CO., INC. 13F CIK 1017284 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	144,840	0.48%	+45,840	Jun 30, 2026	carried, not yet filed for the newest quarter
26	NEW YORK STATE COMMON RETIREMENT FUND 13F CIK 810265 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	137,200	0.45%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
27	GSA CAPITAL PARTNERS LLP 13F CIK 1362033 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	126,451	0.42%	+32,281	Jun 30, 2026	carried, not yet filed for the newest quarter
28	Arosa Capital Management LP 13F CIK 1596053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	125,000	0.41%	-225,000	Jun 30, 2026	carried, not yet filed for the newest quarter
29	Integrated Wealth Concepts LLC 13F CIK 1737109 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	112,080	0.37%	-106,300	Jun 30, 2026	carried, not yet filed for the newest quarter
30	Apis Capital Advisors, LLC 13F CIK 1386892 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	112,000	0.37%	+35,000	Jun 30, 2026	carried, not yet filed for the newest quarter
31	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	105,956	0.35%	+9,514	Jun 30, 2026	carried, not yet filed for the newest quarter
32	Deschenes Roger P. Insider CIK 1496259 · Jun 26, 2026 CAO, issuer-wide	81,975	0.27%	+29,013	Jun 26, 2026	CAO, issuer-wide
33	PANORA ROBERT A Insider CIK 1585814 · Jun 26, 2026 COO and President, issuer-wide	72,194	0.24%	+9,671	Jun 26, 2026	COO and President, issuer-wide
34	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	69,530	0.23%	+44,424	Jun 30, 2026	carried, not yet filed for the newest quarter
34.1	Goldman Sachs Absolute Return Tracker Fund Fund S000020314 · Registered fund · Jun 30, 2026 GOLDMAN SACHS TRUST, not summed	46,949	0.16%	+32,747	Jun 30, 2026	GOLDMAN SACHS TRUST, not summed
35	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	69,226	0.23%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
36	Diametric Capital, LP 13F CIK 1719087 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	66,326	0.22%	+13,195	Jun 30, 2026	carried, not yet filed for the newest quarter
37	SHIKIAR ASSET MANAGEMENT INC 13F CIK 1058022 · Registered investment adviser · Sep 30, 2026	65,050	0.22%	+11,000	Sep 30, 2026
38	PFG Investments, LLC 13F CIK 1973224 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	62,523	0.21%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
39	IMC-Chicago, LLC 13F CIK 1452861 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	61,800	0.20%	+48,150	Jun 30, 2026	carried, not yet filed for the newest quarter
40	HRT FINANCIAL LP 13F CIK 1475597 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	59,285	0.20%	+44,214	Jun 30, 2026	carried, not yet filed for the newest quarter
41	CORSAIR CAPITAL MANAGEMENT, L.P. 13F CIK 1276470 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	55,017	0.18%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
42	MARSHALL WACE, LLP 13F CIK 1318757 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	54,806	0.18%	-152,661	Jun 30, 2026	carried, not yet filed for the newest quarter
43	GROUP ONE TRADING LLC 13F CIK 932540 · Broker-dealer · Jun 30, 2026 carried, not yet filed for the newest quarter	49,872	0.17%	-34,050	Jun 30, 2026	carried, not yet filed for the newest quarter
44	GENDELL JEFFREY L 13F CIK 1056581 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	49,823	0.17%	-195,718	Jun 30, 2026	carried, not yet filed for the newest quarter
45	JANE STREET GROUP, LLC 13F CIK 1595888 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	49,087	0.16%	-68,255	Jun 30, 2026	carried, not yet filed for the newest quarter
46	Whiting John Kimball IV Insider CIK 1808199 · Jun 26, 2026 General Counsel & Secretary, issuer-wide	41,954	0.14%	+19,342	Jun 26, 2026	General Counsel & Secretary, issuer-wide
47	Lafaille Stephen Insider CIK 2074096 · Jun 26, 2026 VP of Business Development, issuer-wide	41,389	0.14%	+29,013	Jun 26, 2026	VP of Business Development, issuer-wide
48	GAMCO INVESTORS, INC. ET AL 13F CIK 807249 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	40,000	0.13%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
49	HighTower Advisors, LLC 13F CIK 1462245 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	39,500	0.13%	-93,165	Jun 30, 2026	carried, not yet filed for the newest quarter
50	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	37,569	0.12%	-112	Jun 30, 2026	carried, not yet filed for the newest quarter

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 86 holders

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Key facts CIK 1537435 CUSIP 87876P201 13F (30d) 3 filings 3 filers Visit website Investor relations