Washington, DC 20549





Proxy Statement Pursuant to Section 14(a) of the Securities

Exchange Act of 1934 (Amendment No. __)




  Filed by the registrant   x 
  Filed by a party other than the registrant ¨ 


  Check the appropriate box:
  ¨  Preliminary proxy statement
  ¨  Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e) (2))
  ¨  Definitive proxy statement
  x  Definitive additional materials
  ¨  Soliciting material under Section 240.14a-12


Hudson Technologies, Inc.

(Name of Registrant as Specified in Its Charter)


(Name of Person(s) Filing Proxy Statement, if other than the Registrant)


Payment of filing fee (Check the appropriate box):
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  ¨  Fee computed on table below per Exchange Act Rules 14a-6(i) (1) and 0-11.
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  ¨  Fee paid previously with preliminary materials.
  ¨  Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a) (2) and identify the filing for which the offsetting fee was paid previously.  Identify the previous filing by registration statement number, or the form or schedule and the date of its filing.
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Your Vote Counts! FLASHID-JOB# For complete information and to vote, visit www.ProxyVote.com Control # Ricky Campana P.O. Box 123456 Suite 500 51 Mercedes Way Edgewood, NY 11717 1 OF 2 322,224 148,294 30# Hextone, Inc. P.O. Box 9142 Farmingdale, NY 11735 XXXX XXXX XXXX XXXX HUDSON TECHNOLOGIES, INC. 2021 Annual Meeting Vote by June 09, 2021 11:59 PM ET You invested in HUDSON TECHNOLOGIES, INC. and it's time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the shareholder meeting to be held on June 10, 2021. View the Annual Report, Notice & Proxy Statement online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 27, 2021. If you would like to request a copy of the material(s) for this and/or future shareholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a Smartphone users Point your camera here and vote without entering a control number Vote in Person at the Meeting* June 10, 2021 10:00 AM EST One Blue Hill Plaza Pearl River, New York 10965 *If you choose to vote these shares in person at the meeting, you must request a “legal proxy.” To do so, please follow the instructions at www.ProxyVote.com or request a paper copy of the materials, which will contain the appropriate instructions. Please check the meeting materials for any special requirements for meeting attendance.






THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming shareholder meeting. Please follow the instructions on the reverse side to vote these important matters. Vote at www.ProxyVote.com FLASHID-JOB# Control # XXXX XXXX XXXX XXXX 1.00000 322,224 148,294 Under New York Stock Exchange rules, brokers may vote “routine” matters at their discretion if your voting instructions are not communicated to us at least 10 days before the meeting. We will nevertheless follow your instructions, even if the broker’s discretionary vote has already been given, provided your instructions are received prior to the meeting date. HUDSON TECHNOLOGIES, INC. 2021 Annual Meeting Vote by June 09, 2021 11:59 PM ET 1. Election of Directors Nominees: 01 Vincent P. Abbatecola 03 Jill K. Frizzley 02 Brian F. Coleman 04 Otto C. Morch For 2. To approve, by non-binding advisory vote, named executive officer compensation. For 3. To ratify the appointment of BDO USA, LLP as independent registered public accountants for the fiscal year ending December 31, 2021. For NOTE: In their discretion, the Proxies are authorized to vote upon such other business as may properly come before the meeting.




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