As Of	Filer	Filing¹	For·On·As	Docs:Size	Issuer		Filing Agent

 4/24/24  Hatsopoulos John                  4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
 4/23/24  Hatsopoulos John                  4          Director²   1:5K   Tecogen Inc.                      Tecogen Inc.             
 4/16/24  Hatsopoulos John                  4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
 4/16/24  Hatsopoulos John                  4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
 4/12/24  Hatsopoulos John                  4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
 4/11/24  Hatsopoulos John                  4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
  4/9/24  Hatsopoulos John                  4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
  4/8/24  Hatsopoulos John                  4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
  4/2/24  Hatsopoulos John                  4          Director²   1:7K   Tecogen Inc.                      Tecogen Inc.             
 1/23/24  Hatsopoulos John                  4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
 1/19/24  Hatsopoulos John                  4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
 1/16/24  Hatsopoulos John                  4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
12/28/23  Hatsopoulos John                  4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
12/26/23  Hatsopoulos John                  4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
12/15/23  Hatsopoulos John                  4          Director²   1:6K   Tecogen Inc.                      Tecogen Inc.             
11/21/23  Hatsopoulos John                  4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
11/17/23  Hatsopoulos John                  4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
11/17/23  Hatsopoulos John                  4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
10/17/23  Hatsopoulos John                  4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
10/13/23  Hatsopoulos John                  4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             

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¹	Filing/Form Type:  -K
	4	Statement of Changes in Beneficial Ownership of Securities by an Insider — Form 4 { The Filer is an Insider² of the Issuer }.
²	Insider:  The Filer is a Director, Officer, 10% Owner and/or Other “insider” of the Issuer.