Insider · SEC Form 4 filer
John Hatsopoulos
Companies
Where they file as an insider
Tecogen (TGEN) Director Latest filing Mar 20, 2026
Track record
Did their buys beat the typical stock?
Open-market buys38
Quarters checked 6 months later0
Beat the typical stock —
Quarters too new to check0
Too soon to tell. None of their buys has a finished 6-month check yet.
Tecogen (TGEN) Bought Jul 10–Sep 27, 2024 · $40.6K · 52,466 shares Not counted Not counted. We have no fund price for this stock on both Sep 30, 2024 and Mar 31, 2025.
Tecogen (TGEN) Bought Apr 1–May 29, 2024 · $54.7K · 72,612 shares Not counted Not counted. We have no fund price for this stock on both Jun 30, 2024 and Dec 31, 2024.
Tecogen (TGEN) Bought Jan 16–Mar 28, 2024 · $91.1K · 124,388 shares Not counted Not counted. We have no fund price for this stock on both Mar 31, 2024 and Sep 30, 2024.
Tecogen (TGEN) Bought Oct 12–Dec 27, 2023 · $207K · 250,100 shares Not counted Not counted. We have no fund price for this stock on both Dec 31, 2023 and Jun 30, 2024.
Tecogen (TGEN) Bought Sep 29, 2023 · $1.96K · 2,000 shares Not counted Not counted. We have no fund price for this stock on both Sep 30, 2023 and Mar 31, 2024.
Each row is one stock in one quarter, however many buys it took. We take the stock's price at the end of that quarter and again 6 months later, and compare it with the typical stock over the same dates. Prices are quarter-end values from funds' 13F reports (the middle value across 3 or more funds), through Sep 30, 2026. Moves past 3 times up or down, mostly stock splits, are left out. How we tested this.
Past results. This is data, not advice.
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