John Hatsopoulos, Co- CEO, Director at American Dg Energy Inc, holds 2.33M shares in Tecogen (Ticker: TGEN), holds 1.13M shares in American Dg Energy Inc (Ticker: ADGE), holds 3.33K shares in American Caresource Holdings (Ticker: GNOW). Most recently, John Hatsopoulos Bought ― shares of Tecogen on Apr 24, 2020 for an estimated value of 24.95K.