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

  5/9/24  Tecogen Inc.                      10-Q        3/31/24   65:6.1M                                                            
  5/9/24  Tecogen Inc.                      8-K:2,7,9    5/9/24   12:2M                                                              
  5/3/24  Lewis Earl R                      4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
  5/3/24  Tecogen Inc.                      8-K:1,9      5/1/24   11:926K                                                            
 4/24/24  Lewis Earl R                      4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
 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.             
 4/23/24  Tecogen Inc.                      DEF 14A     4/23/24    1:1M                                                              
 4/16/24  Hatsopoulos John                  4          Director²   1:4K   Tecogen Inc.                      Tecogen Inc.             
 4/16/24  Lewis Earl R                      5          Director²   1:13K  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.             
 4/12/24  Tecogen Inc.                      PRE 14A     4/12/24    1:1M                                                              
 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.             
 3/25/24  Tecogen Inc.                      10-K       12/31/23   93:8.8M                                                            
 3/14/24  Tecogen Inc.                      8-K:2,7,9   3/14/24   12:3.1M                                                            
  3/7/24  Tecogen Inc.                      8-K:5        3/1/24   10:145K                                                            

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¹	Filing/Form Types:  -U
	4	Statement of Changes in Beneficial Ownership of Securities by an Insider — Form 4 { The Filer is an Insider² of the Issuer }.
	5	Annual Statement of Changes in Beneficial Ownership of Securities by an Insider — Form 5 { The Filer is an Insider² of the Issuer }.
	8-K	Current Report — Form 8-K { Item 1: Business & Operations;  2: Financial Info;  3: Securities & Trading;  4: Accountants & Accounting;  5: Governance & Management;  6: Asset-Backed Securities;  7: Disclosures;  8: Events;  9: Financials }.
	10-K	Annual Report — Form 10-K.
	10-Q	Quarterly Report — Form 10-Q.
	DEF 14A	Definitive Proxy Statement — Schedule 14A.
	PRE 14A	Preliminary Proxy Statement — Schedule 14A.
²	Insider:  The Filer is a Director, Officer, 10% Owner and/or Other “insider” of the Issuer.