HUDSON TECHNOLOGIES INC | Business Contracts

Form of Stock Appreciation Rights Award Agreement (Filed With SEC on March 24, 2022)

Guaranty and Security Agreement dated March 2, 2022 by and among the Grantors named therein and TCW Asset Management Company LLC, as Agent (Filed With SEC on March 3, 2022)

Credit Agreement dated March 2, 2022 by and among TCW Asset Management Company LLC, as Agent, Hudson Technologies, Inc., and the Borrowers and Lenders party thereto (Filed With SEC on March 3, 2022)

Form of Non-Qualified Stock Option Agreement under the 2020 Stock Incentive Plan with conditional vesting provisions (Filed With SEC on March 12, 2021)

Form of Non-Qualified Stock Option Agreement under the 2020 Stock Incentive Plan with vesting in equal installments over a specified period of time (Filed With SEC on March 12, 2021)

Form of Non-Qualified Stock Option Agreement under the 2020 Stock Incentive Plan with full vesting upon issuance (Filed With SEC on March 12, 2021)

Form of Incentive Stock Option Agreement under the 2020 Stock Incentive Plan with vesting in equal installments over a specified period of time (Filed With SEC on March 12, 2021)

Form of Incentive Stock Option Agreement under the 2020 Stock Incentive Plan with full vesting upon issuance (Filed With SEC on March 12, 2021)

Amended and Restated Agreement dated September 30, 2019 between the Company and Kathleen L. Houghton (Filed With SEC on September 16, 2020)

Agreement dated September 14, 2020 between the Company and Kenneth Gaglione (Filed With SEC on September 16, 2020)

Fourth Amended and Restated Agreement dated as of June 24, 2020 between the Registrant and Brian F. Coleman (Filed With SEC on July 20, 2020)

First Amendment to Credit Agreement dated April 23, 2020 with Wells Fargo Bank, National Association (Filed With SEC on May 15, 2020)

Fifth Amendment to Term Loan and Credit and Security Agreement dated April 23, 2020 (Filed With SEC on May 15, 2020)

Description of Equity Securities (Filed With SEC on March 13, 2020)

Amended and Restated Agreement dated as of September 20, 2019 between the Registrant and Nat Krishnamurti (Filed With SEC on September 23, 2019)

Second Amended and Restated Agreement dated as of September 20, 2019 between the Registrant and Brian F. Coleman (Filed With SEC on September 23, 2019)

Third Amended and Restated Employment Agreement dated as of September 20, 2019 between the Registrant and Kevin J. Zugibe (Filed With SEC on September 23, 2019)

Joinder to Term Loan Credit and Security Agreement and Other Documents dated April 17, 2019 (Filed With SEC on May 2, 2019)

Third Amendment and Joinder to Amended and Restated Revolving Credit and Security Agreement and Waiver dated April 17, 2019 (Filed With SEC on May 2, 2019)

Form of Incentive Stock Option Agreement under the 2018 Stock Incentive Plan with vesting in equal installments over a specified of time (Filed With SEC on March 15, 2019)

Form of Incentive Stock Option Agreement under the 2018 Stock Incentive Plan with full vesting upon issuance (Filed With SEC on March 15, 2019)

Form of Non-Qualified Stock Option Agreement under the 2018 Stock Incentive Plan with vesting in equal installments over a specified period of time (Filed With SEC on March 15, 2019)

Form of Non-Qualified Stock Option Agreement under the 2018 Stock Incentive Plan with full vesting upon issuances (Filed With SEC on March 15, 2019)

Form of Non-Qualified Stock Option Agreement under the 2018 Stock Incentive Plan with conditional vesting provisions (Filed With SEC on March 15, 2019)

Second Amendment to Amended and Restated Revolving Credit and Security Agreement, Consent and Waiver (Filed With SEC on December 3, 2018)

Waiver and Third Amendment to Term Loan Credit and Security Agreement (Filed With SEC on December 3, 2018)

Limited Waiver and First Amendment to the Term Loan Credit and Security Agreement and certain other documents (Filed With SEC on November 30, 2018)

Extension Letter dated July 31, 2018 (Filed With SEC on November 30, 2018)

Extension Letter dated August 7, 2018 (Filed With SEC on November 30, 2018)

Third Extension Letter dated November 21, 2018 (Filed With SEC on November 23, 2018)

Second Extension Letter dated November 14, 2018 (Filed With SEC on November 15, 2018)

Extension Letter dated October 15, 2018 (Filed With SEC on October 16, 2018)

Waiver and Second Amendment to Term Loan Credit and Security Agreement (Filed With SEC on August 15, 2018)

First Amendment to Amended and Restated Revolving Credit and Security Agreement with PNC Bank, National Association (Filed With SEC on December 7, 2017)

Amended and Restated Revolving Credit and Security Agreement dated October 10, 2017 with PNC Bank, National Association (Filed With SEC on October 11, 2017)

Amended and Restated Guaranty and Suretyship Agreement dated October 10, 2017 by Hudson Technologies, Inc (Filed With SEC on October 11, 2017)

Term Loan Credit and Security Agreement dated October 10, 2017 with U.S. Bank National Association as Administrative Agent and Collateral Agent for the Term Lenders (Filed With SEC on October 11, 2017)

Guaranty and Suretyship Agreement dated October 10, 2017 by Hudson Technologies, Inc (Filed With SEC on October 11, 2017)

STOCK PURCHASE AGREEMENT by and among AIRGAS, INC., HUDSON HOLDINGS, INC. and HUDSON TECHNOLOGIES, INC. dated as of August 9, 2017 (Filed With SEC on August 9, 2017)

HUDSONTECHNOLOGIES, INC. 6,428,571Shares of Common Stock UnderwritingAgreement (Filed With SEC on December 9, 2016)

AGREEMENT (Filed With SEC on September 9, 2016)

SECOND AMENDED AND RESTATED REVOLVINGCREDIT NOTE PNC Bank, National Association (Filed With SEC on April 14, 2016)

GUARANTORS’ RATIFICATION (Filed With SEC on April 14, 2016)

FIFTH AMENDMENT TO REVOLVING CREDIT,TERM LOAN AND SECURITY AGREEMENT (Filed With SEC on April 14, 2016)

SECOND AMENDED AND RESTATED EMPLOYMENTAGREEMENT (Filed With SEC on March 11, 2016)

AMENDED AND RESTATED AGREEMENT (Filed With SEC on March 11, 2016)

FOURTH AMENDMENT TO REVOLVING CREDIT,TERM LOAN AND SECURITY AGREEMENT (Filed With SEC on July 8, 2015)

GUARANTORS’ RATIFICATION (Filed With SEC on July 8, 2015)

INCENTIVE STOCK OPTION AGREEMENT (BARRIEROPTION) HUDSON TECHNOLOGIES, INC. (Filed With SEC on October 29, 2014)

NON-QUALIFIED STOCK OPTION AGREEMENT(BARRIER OPTION) HUDSON TECHNOLOGIES, INC. (Filed With SEC on October 29, 2014)

INCENTIVE STOCK OPTION AGREEMENT (BARRIEROPTION) HUDSON TECHNOLOGIES, INC. (Filed With SEC on October 29, 2014)

NON-QUALIFIED STOCK OPTION AGREEMENT(BARRIER OPTION) HUDSON TECHNOLOGIES, INC. (Filed With SEC on October 29, 2014)

NON-QUALIFIED STOCK OPTION AGREEMENT HUDSON TECHNOLOGIES, INC. (Filed With SEC on October 29, 2014)

INCENTIVE STOCK OPTION AGREEMENT HUDSON TECHNOLOGIES, INC. (Filed With SEC on October 29, 2014)

NON-QUALIFIED STOCK OPTION AGREEMENT HUDSON TECHNOLOGIES, INC. (Filed With SEC on October 29, 2014)

THIRD AMENDMENT TO REVOLVING CREDIT,TERM LOAN AND SECURITY AGREEMENT (Filed With SEC on July 7, 2014)

GUARANTORS’ RATIFICATION (Filed With SEC on July 7, 2014)

HUDSONTECHNOLOGIES, INC. 6,000,000Shares of Common Stock UnderwritingAgreement (Filed With SEC on June 6, 2014)

AMENDMENTNO. 1 TO THE HUDSONTECHNOLOGIEs, Inc. 2008 Stock Incentive Plan (Filed With SEC on February 28, 2014)

AMENDMENTNO. 1 TO THE HUDSONTECHNOLOGIEs, Inc. 2004 Stock Incentive Plan (Filed With SEC on February 28, 2014)

SECOND AMENDMENT TO REVOLVING CREDIT,TERM LOAN AND SECURITY AGREEMENT (Filed With SEC on October 31, 2013)

GUARANTORS’ RATIFICATION (Filed With SEC on October 31, 2013)

FIRST AMENDMENT TO REVOLVING CREDIT,TERM LOAN AND SECURITY AGREEMENT (Filed With SEC on February 20, 2013)

AMENDED AND RESTATED REVOLVING CREDITNOTE PNC Bank, National Association (Filed With SEC on February 20, 2013)

GUARANTORS’ RATIFICATION (Filed With SEC on February 20, 2013)

Hudson Technologies, Inc. Long Term Care Insurance Plan Summary (Filed With SEC on October 31, 2012)

2,737,500Units HUDSONTECHNOLOGIES, INC. CommonStock PLACEMENT AGENCYAGREEMENT (Filed With SEC on July 2, 2010)

3,870,000Shares of Common Stock HUDSONTECHNOLOGIES, INC. PLACEMENT AGENTAGREEMENT (Filed With SEC on August 3, 2009)

HUDSONTECHNOLOGIES, INC. WARRANT (Filed With SEC on August 3, 2009)

SUBSCRIPTIONAGREEMENT (Filed With SEC on August 3, 2009)

HUDSON TECHNOLOGIES INC (71)