John Hatsopoulos

Sits on 1 board. Last updated September 28, 2026

Time on boards

Boards served
1
Current seats
1
Board service
4 years
Director since
2023

4 years of board service in total across 1 board, counting each seat separately. Longest: Tecogen Inc., 3 years.

Tecogen Inc. Director
3 years ยท Since 2023

Insider trades

All notable trades →

From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.

Date Company Transaction Shares Price Value
Mar 20, 2026 Tecogen Inc. Option exercise +50,000 $0.88 $44,000
Sep 27, 2024 Tecogen Inc. Open-market purchase +10,000 $0.84 $8,400
Sep 25, 2024 Tecogen Inc. Open-market purchase +10,000 $0.86 $8,600
Aug 19, 2024 Tecogen Inc. Open-market purchase +10,000 $0.90 $9,000
Jul 10, 2024 Tecogen Inc. Open-market purchase +22,466 $0.65 $14,603
May 29, 2024 Tecogen Inc. Open-market purchase +10,000 $0.80 $8,000
May 28, 2024 Tecogen Inc. Open-market purchase +1,265 $0.80 $1,012
May 24, 2024 Tecogen Inc. Open-market purchase +8,735 $0.80 $6,988
May 22, 2024 Tecogen Inc. Open-market purchase +3,200 $0.79 $2,528
May 21, 2024 Tecogen Inc. Open-market purchase +13,800 $0.79 $10,902
May 16, 2024 Tecogen Inc. Open-market purchase +3,000 $0.75 $2,250
May 15, 2024 Tecogen Inc. Open-market purchase +10,000 $0.74 $7,400
Apr 24, 2024 Tecogen Inc. Open-market purchase +5,000 $0.67 $3,350
Apr 23, 2024 Tecogen Inc. Open-market purchase +5,000 $0.69 $3,450
Apr 23, 2024 Tecogen Inc. Open-market purchase +1,000 $0.68 $680

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