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$TGEN
$2.10 +$0.18 (9.38%) Close

Ownership

13F as of Q2 2026 · 30.2M shares outstanding

Who owns TGEN?

By type of holder
Institutions 30.4% Insiders 9.5% Everyone else 60.1%
Concentration Top 10 holders own 24.3%
Portolan Capital Management, LLC 5.1% · Hatsopoulos John 3.7%
Institutional ownership
30.4%
+4.6 pts vs last qtr
Institutional holders
68
+6 vs last qtr
Net shares bought
+1.4M
by institutions in Q2 2026
New / sold out
20 / 14
positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026
  • Portolan Capital Management, LLC +1.1M
  • Gratia Capital, LLC NEW +388.7K

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Biggest sellers in Q2 2026
  • Renaissance Technologies LLC SOLD OUT −272.3K
  • Arosa Capital Management LP −225.0K

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Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Tecogen Inc in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2016–FY2025
+41.1%
+4.40% a year
Each share's claim on the business
−29.1%
shrank without buying or selling a share
Spent on buybacks vs paid in stock
— vs $2.03M
over 9 fiscal years
Diluted shares, split-adjusted
18.7M23.1M27.5M2016: 19.3M shares'162017: 23.3M shares'172018: 24.8M shares'182020: 24.9M shares'202021: 25.1M shares'212022: 24.9M shares'222023: 24.9M shares'232024: 24.9M shares'242025: 27.2M shares'25
Buybacks Stock-based comp
$0$174.0K$348.0K2016 buybacks: $02016 stock comp: $165.9K'162017 buybacks: $02017 stock comp: $183.8K'172018 buybacks: $02018 stock comp: $181.2K'182020 buybacks: $02020 stock comp: $190.9K'202021 buybacks: $02021 stock comp: $202.4K'212022 buybacks: $02022 stock comp: $334.1K'222023 buybacks: $02023 stock comp: $250.4K'232024 buybacks: $02024 stock comp: $173.0K'242025 buybacks: $02025 stock comp: $348.0K'25

How patient are the owners?

Institutional shares by how long they've been held
5+ years0% 3–5 years0% 1–3 years62% Under 1 year38%
Quarterly turnover
29.7%
of institutional shares changed hands
Top 10 managers, median time held
1 year

Super Investors

Investment managers reporting TGEN on Form 13F
PC
Portolan Capital Management, LLC
Shares
1.6M
% of company
5.14%
Change vs last qtr
+1.1M (+249.7%)
Held since
2025
VC
Vanguard Capital Management LLC
Shares
788.7K
% of company
2.61%
Change vs last qtr
+18.7K (+2.4%)
Held since
2025

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Institutional Funds

Mutual funds and ETFs reporting TGEN on Form N-PORT; together they hold 6.4% of the company
VT
Vanguard Total Stock Market Index Fund
Vanguard Index Funds
Position value
$3.03M
% of company
1.92%
% of the fund
0.00%
As of
June 30, 2026
SA
Strategic Advisers U.S. Total Stock Fund
Fidelity Rutland Square Trust II
Position value
$2.33M
% of company
2.53%
% of the fund
0.00%
As of
August 31, 2026

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Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G
HJ
Hatsopoulos John
Insider
Shares
1.1M
% of company
3.69%
Change vs last qtr
—
Held since
—
LE
Lewis Earl R
Insider
Shares
1.0M
% of company
3.35%
Change vs last qtr
—
Held since
—

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