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Tecogen Inc. (TGEN) institutional ownership

Market cap$113M SectorIndustrials
Funds holding · Q1 2026
65
reported TGEN position changes
Top owners · Q1 2026
No disclosed owners are available.
Institutional activity · Q1 2026
Activity unavailable N/A
28 buyers · 37 sellers

Tecogen Inc. (TGEN) price and institutional activity

Dates

Q1 2026

$0 bought by 28 investors
Meros Investment Management, LPIntegrated Wealth Concepts LLC +26 more
$0 sold by 37 investors
Susquehanna International Group, LLPTwo Sigma Investments, LP +35 more
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Bought Sold Totals per quarter; hover a bar for the names.

Tecogen Inc. (TGEN) institutional activity · 65

Investor Type Est. change Change Δ Own Date
Meros Investment Management, LP · New
Change +292K Date Q1 2026
Meros Investment Management, LP New· Q1 2026 +292K Q1 2026
Integrated Wealth Concepts LLC · New
Change +218K Date Q1 2026
Integrated Wealth Concepts LLC New· Q1 2026 +218K Q1 2026
Renaissance Technologies LLC Added· Q1 2026 +218K +401.5% Q1 2026
UBS Group AG · Added
Change +215K Date Q1 2026
UBS Group AG Added· Q1 2026 +215K Q1 2026
Susquehanna International Group, LLP · Reduced
Change −193K Date Q1 2026
Susquehanna International Group, LLP Reduced· Q1 2026 −193K Q1 2026
Two Sigma Investments, LP · Reduced
Change −151K Δ Own −69.2% Date Q1 2026
Two Sigma Investments, LP Reduced· Q1 2026 −151K −69.2% Q1 2026
Citadel Advisors LLC Added· Q1 2026 +99K +201.5% Q1 2026
Jane Street Group, LLC · Reduced
Change −90K Date Q1 2026
Jane Street Group, LLC Reduced· Q1 2026 −90K Q1 2026
Granahan Investment Management, LLC · Reduced
Change −89K Date Q1 2026
Granahan Investment Management, LLC Reduced· Q1 2026 −89K Q1 2026
Raymond James Financial Inc · Added
Change +86K Date Q1 2026
Raymond James Financial Inc Added· Q1 2026 +86K Q1 2026
Point72 Asset Management, L.P. · Exited
Change −84K Δ Own −100.0% Date Q1 2026
Point72 Asset Management, L.P. Exited· Q1 2026 −84K −100.0% Q1 2026
Royal Bank of Canada · Reduced
Change −82K Date Q1 2026
Royal Bank of Canada Reduced· Q1 2026 −82K Q1 2026
Marshall Wace, LLP · Reduced
Change −79K Date Q1 2026
Marshall Wace, LLP Reduced· Q1 2026 −79K Q1 2026
Apis Capital Advisors, LLC · New
Change +77K Date Q1 2026
Apis Capital Advisors, LLC New· Q1 2026 +77K Q1 2026
Gsa Capital Partners LLP · Added
Change +75K Date Q1 2026
Gsa Capital Partners LLP Added· Q1 2026 +75K Q1 2026
Data through Q1 2026 · filed Jun 3, 2026
15 of 65

Famous investor activity in Tecogen Inc. (TGEN)

Tecogen Inc. (TGEN) insider trading

Company insiders, action and economics first; trade and filed dates last.
Dates
Insider Title Type Price Qty Value Owned ΔOwn Trade date Filed date
Whiting John Kimball IV · Officer Grant (A) 19K
Owned 19K Trade date Jun 26, 2026 Filed date Jun 30, 2026
Whiting John Kimball IV Officer Grant (A) 19K 19K Jun 26, 2026 Jun 30, 2026
Lafaille Stephen · Officer Grant (A) 29K
Owned 29K Trade date Jun 26, 2026 Filed date Jun 30, 2026
Lafaille Stephen Officer Grant (A) 29K 29K Jun 26, 2026 Jun 30, 2026
Deschenes Roger P. · Officer Grant (A) 29K
Owned 29K Trade date Jun 26, 2026 Filed date Jun 30, 2026
Deschenes Roger P. Officer Grant (A) 29K 29K Jun 26, 2026 Jun 30, 2026
Panora Robert · Officer 2 operations 36K
Price $5.17 Owned 26K Trade date Jun 26, 2026 Filed date Jun 30, 2026
Panora Robert Officer 2 operations $5.17 36K 26K Jun 26, 2026 Jun 30, 2026
Rangesh Abinand · Director 2 operations 200K
Price $5.17 Owned 26K Trade date Jun 26, 2026 Filed date Jun 30, 2026
Rangesh Abinand Director 2 operations $5.17 200K 26K Jun 26, 2026 Jun 30, 2026
Hirsch Susan B. · Director Grant (A) $129K
Price $5.17 Qty 25K Owned 25K Trade date Jun 26, 2026 Filed date Jun 30, 2026
Hirsch Susan B. Director Grant (A) $5.17 25K $129K 25K Jun 26, 2026 Jun 30, 2026
Albertine John M. · Director Grant (A) $129K
Price $5.17 Qty 25K Owned 25K Trade date Jun 26, 2026 Filed date Jun 30, 2026
Albertine John M. Director Grant (A) $5.17 25K $129K 25K Jun 26, 2026 Jun 30, 2026
Lewis Earl · Director Grant (A) $129K
Price $5.17 Qty 25K Owned 25K Trade date Jun 26, 2026 Filed date Jun 30, 2026
Lewis Earl Director Grant (A) $5.17 25K $129K 25K Jun 26, 2026 Jun 30, 2026
Ghoniem Ahmed · Director Grant (A) $129K
Price $5.17 Qty 25K Owned 25K Trade date Jun 26, 2026 Filed date Jun 30, 2026
Ghoniem Ahmed Director Grant (A) $5.17 25K $129K 25K Jun 26, 2026 Jun 30, 2026
Galiteva Angelina · Director Grant (A) $129K
Price $5.17 Qty 25K Owned 25K Trade date Jun 26, 2026 Filed date Jun 30, 2026
Galiteva Angelina Director Grant (A) $5.17 25K $129K 25K Jun 26, 2026 Jun 30, 2026
Ghoniem Ahmed · Director Buy +$10K
Price $0.79 Qty +13K Owned 13K Trade date Apr 24, 2026 Filed date Apr 27, 2026
Ghoniem Ahmed Director Buy $0.79 +13K +$10K 13K Apr 24, 2026 Apr 27, 2026
Ghoniem Ahmed · Director Exercise or conversion (M/X/C) -$10K
Price $0.79 Qty -13K Owned 0 Trade date Apr 24, 2026 Filed date Apr 27, 2026
Ghoniem Ahmed Director Exercise or conversion (M/X/C) $0.79 -13K -$10K 0 Apr 24, 2026 Apr 27, 2026
Hirsch Susan B. · Director Buy +$19K
Price $3.73 Qty +5K Owned 265K Trade date Apr 13, 2026 Filed date Apr 14, 2026
Hirsch Susan B. Director Buy $3.73 +5K +$19K 265K Apr 13, 2026 Apr 14, 2026
Hirsch Susan B. · Director Buy +$25K
Price $2.54 Qty +10K Owned 260K Trade date Mar 27, 2026 Filed date Mar 27, 2026
Hirsch Susan B. Director Buy $2.54 +10K +$25K 260K Mar 27, 2026 Mar 27, 2026
Lewis Earl · Director Buy +$13K
Price $2.52 Qty +5K Owned 1.0M Trade date Mar 27, 2026 Filed date Mar 27, 2026
Lewis Earl Director Buy $2.52 +5K +$13K 1.0M Mar 27, 2026 Mar 27, 2026
15 of 29
15 of 29 Sign in to continue to older insider transactions.

Tecogen Inc. (TGEN) activist and large shareholders

What are Schedules 13D and 13G?

Dates
Owner/Filer identity Shares reported % of shares outstanding Filing date
Portolan Capital Management, LLC 1.6M
% of shares outstanding 5.2% Filing date Jun 10, 2026
Portolan Capital Management, LLC 1.6M 5.2% Jun 10, 2026
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Tecogen Inc. (TGEN) ownership FAQ

Who owns TGEN?

65 reporting institutions disclosed TGEN position changes in the Q1 2026 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.