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

11/19/21  Mandracchia Stephen P             4          Director²   1:7K   Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
11/17/21  Krishnamurti Nat                  4          Officer²    1:10K  Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
11/17/21  Coleman Brian F                   4          Dir.,Off.²  1:9K   Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
 9/15/21  Monetta Dominic J                 4          Director²   1:18K  Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
 8/31/21  Prouty Eric A                     4          Director²   1:6K   Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
 8/26/21  Monetta Dominic J                 4          Director²   1:6K   Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
 8/18/21  Coleman Brian F                   4          Dir.,Off.²  1:6K   Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
  8/9/21  Morch Otto C                      4          Director²   1:4K   Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
  8/2/21  Morch Otto C                      4          Director²   1:6K   Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
  7/6/21  Abbatecola Vincent P              4          Director²   1:4K   Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
  7/2/21  Parrillo Richard                  4          Director²   1:4K   Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
  7/2/21  Mandracchia Stephen P             4          Director²   1:5K   Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
  7/2/21  Caruso Richard Damian             4          Director²   1:5K   Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
  7/2/21  Prouty Eric A                     4          Director²   1:4K   Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
  7/2/21  Morch Otto C                      4          Director²   1:4K   Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
  7/2/21  Monetta Dominic J                 4          Director²   1:5K   Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
 6/22/21  Prouty Eric A                     4          Director²   1:6K   Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
 6/11/21  Houghton Kathleen                 4          Officer²    1:9K   Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
  6/7/21  Houghton Kathleen                 4          Officer²    1:6K   Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     
  6/3/21  Morch Otto C                      4          Director²   1:4K   Hudson Technologies Inc./NY       Wiggin & Dana LLP/FA     

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¹	Filing/Form Type:
	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.