HDSN / Hudson Technologies, Inc. - SEC 보고서, 연례 보고, 기업 사업 설명서

허드슨 테크놀로지스, Inc.
US ˙ NasdaqCM ˙ US4441441098

기본 통계
CIK 925528
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Hudson Technologies, Inc.
SEC Filings (Chronological Order)
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May 28, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) May 27, 2026 Hudson Technologies, Inc.

May 28, 2026 EX-99.1

HUDSON TECHNOLOGIES receives EXTENSION OF Contract with the united states defense logistics agency

Exhibit 99.1 HUDSON TECHNOLOGIES receives EXTENSION OF Contract with the united states defense logistics agency WOODCLIFF LAKE, NJ – MAY 28, 2026 – Hudson Technologies, Inc. (NASDAQ: HDSN), a leading provider of innovative and sustainable refrigerant products and services to the Heating, Ventilation, Air Conditioning, and Refrigeration industry - and one of the nation’s largest refrigerant reclaim

May 20, 2026 EX-10.1

FIFTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT

Exhibit 10.1 FIFTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT THIS FIFTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT (this “Amendment”), dated as of May 19, 2026, is entered into by and among WELLS FARGO BANK, NATIONAL ASSOCIATION, a national banking association (“Wells Fargo”), in its capacity as agent for the Lender Group and the Bank Product Providers (in such capacity, together

May 20, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) May 19, 2026 Hudson Technologies, Inc.

May 18, 2026 EX-99.1

HUDSON TECHNOLOGIES ANNOUNCES OPEN MARKET SHARE PURCHASES BY THE BOARD AND SENIOR MANAGEMENT

Exhibit 99.1 HUDSON TECHNOLOGIES ANNOUNCES OPEN MARKET SHARE PURCHASES BY THE BOARD AND SENIOR MANAGEMENT Woodcliff Lake, NJ – May 18, 2026– Hudson Technologies, Inc. (NASDAQ: HDSN) (“Hudson”; or “the Company”) a leading provider of innovative and sustainable refrigerant products and services to the Heating, Ventilation, Air Conditioning and Refrigeration Industry – and one of the nation’s largest

May 18, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) May 18, 2026 Hudson Technologies, Inc.

May 11, 2026 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2026 ☐ TRANSITION REPORT PURSUANT TO SE

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2026 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

May 6, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) May 6, 2026 Hudson Technologies, Inc.

May 6, 2026 EX-99.1

HUDSON TECHNOLOGIES REPORTS FIRST quarter 2026 reSults Strong volumes drive 9% revenue growth

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS FIRST quarter 2026 reSults Strong volumes drive 9% revenue growth First Quarter 2026 Financial Highlights · Revenue increased 9% to $60.2 million · 20% sales volume growth · Share repurchases of $2.5 million · HFC prices firming above $6 per pound WOODCLIFF LAKE, NJ – MAY 6, 2026 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the first qua

April 24, 2026 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.    )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

April 24, 2026 ARS

ARS

UNITEDSTATES SECURITIESANDEXCHANGECOMMISSION WASHINGTON,DC20549 FORM10-K ☒ ANNUALREPORTPURSUANTTOSECTION13OR15(d)OFTHESECURITIESEXCHANGEACTOF1934 ForthefiscalyearendedDecember31,2025 OR ☐ TRANSITIONREPORTPURSUANTTOSECTION13OR15(d)OFTHESECURITIESEXCHANGEACTOF1934 Forthetransitionperiodfrom to Commissionfilenumber1-13412 HudsonTechnologies,Inc.

April 24, 2026 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A 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)) ¨ Defin

April 13, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) April 10, 2026 Hudson Technologies, Inc.

April 13, 2026 EX-99.1

HUDSON TECHNOLOGIES ANNOUNCES ELECTION OF ALAN SHERIFF AND JEFFREY FEELER AS INDEPENDENT DIRECTORS -        Appointments Add Capital Markets and Operational Expertise

Exhibit 99.1 HUDSON TECHNOLOGIES ANNOUNCES ELECTION OF ALAN SHERIFF AND JEFFREY FEELER AS INDEPENDENT DIRECTORS -        Appointments Add Capital Markets and Operational Expertise Woodcliff Lake, NJ –April 13, 2026– Hudson Technologies, Inc. (NASDAQ: HDSN) (“Hudson”; “the Company”) a leading provider of innovative and sustainable refrigerant products and services to the Heating, Ventilation, Air C

March 18, 2026 EX-99.1

HUDSON TECHNOLOGIES ANNOUNCES MANAGEMENT APPOINTMENTS TO STRENGTHEN OPERATIONS, EXTEND MARKET REACH AND ACCELERATE GROWTH

Exhibit 99.1 HUDSON TECHNOLOGIES ANNOUNCES MANAGEMENT APPOINTMENTS TO STRENGTHEN OPERATIONS, EXTEND MARKET REACH AND ACCELERATE GROWTH · ROB STOODY PROMOTED TO SENIOR VICE PRESIDENT, OPERATIONS · KIRK REIMER NAMED VICE PRESIDENT, SALES & MARKETING Woodcliff Lake, NJ –March 18, 2026– Hudson Technologies, Inc. (NASDAQ: HDSN) (“Hudson” or “the Company”) a leading provider of innovative and sustainabl

March 18, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) March 13, 2026 Hudson Technologies, Inc.

March 16, 2026 EX-19

Insider Trading Policy HUDSON TECHNOLOGIES, INC. Effective as of January 1, 2026

Exhibit 19 Insider Trading Policy HUDSON TECHNOLOGIES, INC. Effective as of January 1, 2026 1. Purpose of this Policy. In the course of performing your duties for Hudson Technologies, Inc., you may from time to time receive or become aware of material nonpublic information (“MNPI”) about the Company and its subsidiaries (the “Company”) or other companies that do business with the Company. This Ins

March 16, 2026 EX-21

Subsidiaries of the Registrant

Exhibit 21 Subsidiaries of the Registrant Hudson Technologies Company incorporated in the State of Delaware Hudson Holdings, Inc.

March 16, 2026 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2025 ☐ TRANSITION REPORT PURSUANT TO SECTIO

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

March 4, 2026 EX-99.1

HUDSON TECHNOLOGIES REPORTS Fourth quarter And year-end 2025 reSults

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS Fourth quarter And year-end 2025 reSults · 28% growth in fourth quarter revenue to $44.4 million · Annual refrigerant sales volume grew by 6% · Annual refrigerant reclamation volume increased by 18% for second consecutive year · Maintained strong, unlevered balance sheet · Completed accretive acquisition of Refrigerants Inc. · Board approved $20 million sha

March 4, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) March 4, 2026 Hudson Technologies, Inc.

February 2, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) January 30, 2026 Hudson Technologies, Inc.

February 2, 2026 EX-10.1

AGREEMENT

Exhibit 10.1 AGREEMENT THIS AGREEMENT (the “Agreement”) is made as of the 2 day of November, 2021 by and between Hudson Technologies, Inc., P.O. Box 1541, One Blue Hill Plaza, Pearl River, New York 10965 and Hudson Technologies Company, P.O. Box 1541, One Blue Hill Plaza, Pearl River, New York 10965 (hereinafter Hudson Technologies, Inc. and Hudson Technologies Company are collectively referred to

January 30, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) January 30, 2026 Hudson Technologies, Inc.

January 30, 2026 EX-99.1

HUDSON TECHNOLOGIES PROVIDES UPDATE ON STATUS OF DEFENSE LOGISTICS AGENCY CONTRACT

Exhibit 99.1 HUDSON TECHNOLOGIES PROVIDES UPDATE ON STATUS OF DEFENSE LOGISTICS AGENCY CONTRACT WOODCLIFF LAKE, NJ – JANUARY 30, 2026 –Hudson Technologies, Inc. (NASDAQ: HDSN) a leading provider of innovative and sustainable refrigerant products and services to the Heating, Ventilation, Air Conditioning, and Refrigeration industry – and one of the nation’s largest refrigerant reclaimers – today pr

January 5, 2026 CORRESP

HUDSON TECHNOLOGIES, INC. 300 Tice Boulevard, Suite 290 Woodcliff Lake, NJ 07677 845-735-6000 (Phone)

HUDSON TECHNOLOGIES, INC. 300 Tice Boulevard, Suite 290 Woodcliff Lake, NJ 07677 845-735-6000 (Phone) January 5, 2026 VIA EDGAR Division of Corporation Finance U.S. Securities and Exchange Commission 100 F Street NE Washington, DC 20549 Re: HUDSON TECHNOLOGIES, INC. (the “Company”) Registration Statement on Form S-3 (File No. 333-292167) Ladies and Gentlemen: Pursuant to Rule 461 under the Securit

December 17, 2025 EX-99.1

HUDSON TECHNOLOGIES ANNOUNCES ACCRETIVE ACQUISITION OF REFRIGERANTS INC. - EPA-Certified reclaimer and refrigerant distributor expands recovery network and geographic footprint

Exhibit 99.1 HUDSON TECHNOLOGIES ANNOUNCES ACCRETIVE ACQUISITION OF REFRIGERANTS INC. - EPA-Certified reclaimer and refrigerant distributor expands recovery network and geographic footprint Woodcliff Lake, NJ –December 17, 2025– Hudson Technologies, Inc. (NASDAQ: HDSN) a leading provider of innovative and sustainable refrigerant products and services to the Heating, Ventilation, Air Conditioning a

December 17, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) December 17, 2025 Hudson Technologies, Inc.

December 16, 2025 EX-4.12

HUDSON TECHNOLOGIES, INC. Dated as of Debt Securities Reconciliation and tie between Trust Indenture Act of 1939, as amended, and the Indenture

Exhibit 4.12 HUDSON TECHNOLOGIES, INC. AND Trustee INDENTURE Dated as of Debt Securities Reconciliation and tie between Trust Indenture Act of 1939, as amended, and the Indenture Trust Indenture Act Section Indenture Section (S)310(a)(1) 6.8 (a)(2) 6.8 (b) 6.9 (S)312(a) 7.1 (b) 7.2 (c) 7.2 (S)313(a) 7.3 (b)(2) 7.3 (c) 7.3 (d) 7.3 (S)314(a) 7.4 (c)(1) 1.2 (c)(2) 1.2 (e) 1.2 (f) 1.2 (S)316(a) (last

December 16, 2025 S-3

As filed with the Securities and Exchange Commission on December 16, 2025

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on December 16, 2025 Registration No.

December 16, 2025 EX-FILING FEES

Security Type

Calculation of Filing Fee Tables S-3 HUDSON TECHNOLOGIES INC /NY Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Equity Common Stock, par value $0.

December 9, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) December 9, 2025 Hudson Technologies, Inc.

December 1, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) November 25, 2025 Hudson Technologies, Inc.

December 1, 2025 EX-99.1

HUDSON TECHNOLOGIES Board of Directors approves increase in share repurchase authorization

Exhibit 99.1 HUDSON TECHNOLOGIES Board of Directors approves increase in share repurchase authorization WOODCLIFF LAKE, NJ – December 1, 2025 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced that its board of directors has approved an increase to the Company’s share repurchase authorization. Hudson may now purchase up to $20 million in shares of its common stock during calendar year 2025, an i

December 1, 2025 EX-10.1

FOURTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT

  Exhibit 10.1   FOURTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT   THIS FOURTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT (this “Amendment”), dated as of November 25, 2025, is entered into by and among WELLS FARGO BANK, NATIONAL ASSOCIATION, a national banking association (“Wells Fargo”), in its capacity as agent for the Lender Group and the Bank Product Providers (in such capaci

November 13, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) November 13, 2025 Hudson Technologies, Inc.

November 13, 2025 EX-10.1

EMPLOYMENT AGREEMENT

  Exhibit 10.1   EMPLOYMENT AGREEMENT   THIS EMPLOYMENT AGREEMENT (this “Agreement”) is made as of the 24th day of November, 2025 by and between Hudson Technologies, Inc., 300 Tice Boulevard, Suite 290, Woodcliff Lake, NJ 07677 (the “Company” or “Hudson”) and Kenneth Gaglione, residing at [•] (“Executive”).   WHEREAS, Hudson desires to retain Executive as Chairman of the Board, President and Chief

November 13, 2025 EX-99.1

HUDSON TECHNOLOGIES Appoints Kenneth Gaglione as Chairman of the board, president and chief exEcutive officer

Exhibit 99.1 HUDSON TECHNOLOGIES Appoints Kenneth Gaglione as Chairman of the board, president and chief exEcutive officer WOODCLIFF LAKE, NJ – NOVEMBER 13, 2025 – Hudson Technologies, Inc. (NASDAQ: HDSN) (the “Company”) today announced that its Board of Directors has appointed Kenneth Gaglione as Chairman of the Board, President and Chief Executive Officer, effective November 24, 2025. Mr. Gaglio

November 7, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2025 ☐ TRANSITION REPORT PURSUANT T

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

November 5, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) November 5, 2025 Hudson Technologies, Inc.

November 5, 2025 EX-99.1

HUDSON TECHNOLOGIES REPORTS THIRD quarter 2025 reSults

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS THIRD quarter 2025 reSults · Third quarter revenue grew 20% to $74.0 million; Gross margin improved to 32.0% · Net income grew 59% to $12.4 million or $0.27 per diluted share · Substantial cash position and no debt at September 30, 2025 WOODCLIFF LAKE, NJ – November 5, 2025 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the third quarter a

November 3, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) November 3, 2025 Hudson Technologies, Inc.

November 3, 2025 EX-99.1

HUDSON TECHNOLOGIES ANNOUNCES CEO DEPARTURE AND SUCCESSION PLAN - COMPANY ANNOUNCES strong PRELIMINARY THIRD QUARTER 2025 RESULTS -

Exhibit 99.1 HUDSON TECHNOLOGIES ANNOUNCES CEO DEPARTURE AND SUCCESSION PLAN - COMPANY ANNOUNCES strong PRELIMINARY THIRD QUARTER 2025 RESULTS - WOODCLIFF LAKE, NJ – NOVEMBER 3, 2025 –Hudson Technologies, Inc. (NASDAQ: HDSN) a leading provider of innovative and sustainable refrigerant products and services to the Heating, Ventilation, Air Conditioning, and Refrigeration industry – and one of the n

October 22, 2025 EX-99.1

HUDSON TECHNOLOGIES WINs U.S. DEFENSE LOGISTICS AGENCY contract

Exhibit 99.1 HUDSON TECHNOLOGIES WINs U.S. DEFENSE LOGISTICS AGENCY contract WOODCLIFF LAKE, NJ – OCTOBER 22, 2025 –Hudson Technologies, Inc. (NASDAQ: HDSN) a leading provider of innovative and sustainable refrigerant products and services to the Heating, Ventilation, Air Conditioning, and Refrigeration industry – and one of the nation’s largest refrigerant reclaimers – today announced that it has

October 22, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) October 22, 2025 Hudson Technologies, Inc.

August 1, 2025 EX-10.1

Agreement dated July 31, 2025 between Hudson Technologies, Inc., Hudson Technologies Company and Brian J. Bertaux*

Exhibit 10.1 AGREEMENT THIS AGREEMENT (the “Agreement”) is made as of the 31st day of July, 2025 by and between Hudson Technologies, Inc., 300 Tice Boulevard, Suite 290, Woodcliff Lake, New Jersey 07677, and Hudson Technologies Company, 300 Tice Boulevard, Suite 290, Woodcliff Lake, New Jersey 07677 (hereinafter Hudson Technologies, Inc. and Hudson Technologies Company are collectively referred to

August 1, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 ☐ TRANSITION REPORT PURSUANT TO SEC

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

July 30, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) July 30, 2025 Hudson Technologies, Inc.

July 30, 2025 EX-99.1

HUDSON TECHNOLOGIES REPORTS SECOND quarter 2025 reSults

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS SECOND quarter 2025 reSults · Second quarter revenue of $72.8 million; Gross margin of 31% · Net income of $10.2 million or $0.23 per diluted share · Reports $84.3 million in cash and no debt at June 30, 2025 WOODCLIFF LAKE, NJ – July 30, 2025 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the second quarter and six months ended June 30, 2

June 23, 2025 EX-10.1

Third Amendment to Amended and Restated Credit Agreement dated June 23, 2025 by and among Wells Fargo Bank, National Association, as Agent, Hudson Technologies, Inc., and the Borrowers and Lenders party thereto

  Exhibit 10.1   THIRD AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT   THIS THIRD AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT (this “Amendment”), dated as of June 23, 2025, is entered into by and among WELLS FARGO BANK, NATIONAL ASSOCIATION, a national banking association (“Wells Fargo”), in its capacity as agent for the Lender Group and the Bank Product Providers (in such capacity, to

June 23, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) June 23, 2025 Hudson Technologies, Inc.

June 12, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported)   June 11, 2025 Hudson Technologies, Inc.

May 9, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 ☐ TRANSITION REPORT PURSUANT TO SE

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

May 7, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) May 7, 2025 Hudson Technologies, Inc.

May 7, 2025 EX-99.1

HUDSON TECHNOLOGIES REPORTS first quarter 2025 reSults

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS first quarter 2025 reSults · First quarter revenue reflects continued low refrigerant market price landscape · Reports $81 million in cash and no debt at March 31, 2025 · Continues share repurchase program WOODCLIFF LAKE, NJ – May 7, 2025 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the first quarter ended March 31, 2025. Brian F. Colema

April 25, 2025 ARS

ARS

UNITEDSTATES SECURITIESANDEXCHANGECOMMISSION WASHINGTON,DC20549 FORM10-K ☒ ANNUALREPORTPURSUANTTOSECTION13OR15(d)OFTHESECURITIESEXCHANGEACTOF1934 ForthefiscalyearendedDecember31,2024 OR ☐ TRANSITIONREPORTPURSUANTTOSECTION13OR15(d)OFTHESECURITIESEXCHANGEACTOF1934 Forthetransitionperiodfrom to Commissionfilenumber1-13412 HudsonTechnologies,Inc.

April 25, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A 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)) ¨ Defin

April 25, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.    )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 12, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 ☐ TRANSITION REPORT PURSUANT TO SECTIO

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

March 12, 2025 EX-10.44

Form of Incentive Stock Option Agreement under the 2024 Stock Incentive Plan with full vesting upon issuance (31)*

Exhibit 10.44 INCENTIVE STOCK OPTION AGREEMENT HUDSON TECHNOLOGIES, INC. AGREEMENT made as of the (insert date) (the “Grant Date”) between Hudson Technologies, Inc. (the “Company”), a New York corporation, having a principal place of business at 300 Tice Boulevard, Suite 290, Woodcliff Lake, New Jersey 07677, and (insert name of Grantee) (the “Grantee”). WHEREAS, the Company desires to grant to th

March 12, 2025 EX-10.45

Form of Incentive Stock Option Agreement under the 2024 Stock Incentive Plan with vesting in equal installments over a specified period of time (31)*

Exhibit 10.45 INCENTIVE STOCK OPTION AGREEMENT HUDSON TECHNOLOGIES, INC. AGREEMENT made as of the (insert date) (the “Grant Date”) between Hudson Technologies, Inc. (the “Company”), a New York corporation, having a principal place of business at 300 Tice Boulevard, Suite 290, Woodcliff Lake, New Jersey 07677, and (insert name of Grantee) (the “Grantee”). WHEREAS, the Company desires to grant to th

March 12, 2025 EX-10.47

Form of Non-Qualified Stock Option Agreement under the 2024 Stock Incentive Plan with vesting in equal installments over a specified period of time (31)*

Exhibit 10.47 NON-QUALIFIED STOCK OPTION AGREEMENT HUDSON TECHNOLOGIES, INC. AGREEMENT made as of (insert date) (the “Grant Date”) between Hudson Technologies, Inc. (the “Company”), a New York corporation, having a principal place of business at 300 Tice Boulevard, Suite 290, Woodcliff Lake, New Jersey 07677, and (insert name of Grantee) (the “Grantee”). WHEREAS, the Company desires to grant to th

March 12, 2025 EX-10.48

Form of Non-Qualified Stock Option Agreement under the 2024 Stock Incentive Plan with conditional vesting provisions (31)*

Exhibit 10.48 NON-QUALIFIED STOCK OPTION AGREEMENT HUDSON TECHNOLOGIES, INC. AGREEMENT made as of (grant date) (the “Grant Date”) between Hudson Technologies, Inc. (the “Company”), a New York corporation, having a principal place of business at 300 Tice Boulevard, Suite 290, Woodcliff Lake, New Jersey 07677, and (insert name of Grantee) (the “Grantee”). WHEREAS, the Company desires to grant to the

March 12, 2025 EX-10.46

Form of Non-Qualified Stock Option Agreement under the 2024 Stock Incentive Plan with full vesting upon issuance (31)*

Exhibit 10.46 NON-QUALIFIED STOCK OPTION AGREEMENT HUDSON TECHNOLOGIES, INC. AGREEMENT made as of (insert date) (the “Grant Date”) between Hudson Technologies, Inc. (the “Company”), a New York corporation, having a principal place of business at 300 Tice Boulevard, Suite 290, Woodcliff Lake, New Jersey 07677, and (insert name of Grantee) (the “Grantee”). WHEREAS, the Company desires to grant to th

March 12, 2025 EX-21

Subsidiaries of the Company. (31)

Exhibit 21: Subsidiaries of the Registrant Hudson Technologies Company incorporated in the State of Delaware Hudson Holdings, Inc.

March 6, 2025 EX-99.1

HUDSON TECHNOLOGIES REPORTS fourth quarter and YEAR END 2024 reSults

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS fourth quarter and YEAR END 2024 reSults · Strong unlevered balance sheet with $70.1 million in cash and no debt · Repurchased $8.1 million of common stock in 2024 · Increased refrigerant reclamation volume by 18% in 2024 WOODCLIFF LAKE, NJ – March 6, 2025 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the fourth quarter and year ended Dec

March 6, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) March 6, 2025 Hudson Technologies, Inc.

November 12, 2024 SC 13G/A

HDSN / Hudson Technologies, Inc. / VANGUARD GROUP INC Passive Investment

240.13d-102 Schedule 13G - Information to be included in statements filed pursuant to 240.13d-1(b), (c), and (d) and amendments thereto filed pursuant to 240.13d-2. Securities and Exchange Commission, Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* (Name of Issuer) Hudson Technologies Inc (Title of Class of Securities) Common Stock (CUSIP Number) 44

November 8, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 ☐ TRANSITION REPORT PURSUANT T

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

November 4, 2024 SC 13G/A

HDSN / Hudson Technologies, Inc. / VANGUARD GROUP INC Passive Investment

240.13d-102 Schedule 13G - Information to be included in statements filed pursuant to 240.13d-1(b), (c), and (d) and amendments thereto filed pursuant to 240.13d-2. Securities and Exchange Commission, Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No. )* (Name of Issuer) Hudson Technologies Inc (Title of Class of Securities) Common Stock (CUSIP Number) 444

November 4, 2024 EX-99.1

HUDSON TECHNOLOGIES REPORTS THIRD quarter 2024 reSults

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS THIRD quarter 2024 reSults · Third Quarter Revenue of $61.9 million · Net income of $7.8 million or $0.17 per diluted share · Strengthened balance sheet with $56.5 million in cash and no debt · Repurchased $2.6 million of common stock during the third quarter WOODCLIFF LAKE, NJ – November 4, 2024 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced results

November 4, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) November 4, 2024 Hudson Technologies, Inc.

October 25, 2024 EX-10.1

Second Amendment to Amended and Restated Credit Agreement dated October 23, 2024 by and among Wells Fargo Bank, National Association, as Agent, Hudson Technologies, Inc., and the Borrowers and Lenders party thereto

Exhibit 10.1 SECOND AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT THIS SECOND AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT (this “Amendment”), dated as of October 23, 2024, is entered into by and among WELLS FARGO BANK, NATIONAL ASSOCIATION, a national banking association (“Wells Fargo”), in its capacity as agent for the Lender Group and the Bank Product Providers (in such capacity, tog

October 25, 2024 EX-99.1

HUDSON TECHNOLOGIES Board of Directors approves increase to company’s share repurchase Program

Exhibit 99.1 HUDSON TECHNOLOGIES Board of Directors approves increase to company’s share repurchase Program WOODCLIFF LAKE, NJ – October 25, 2024 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced that its board of directors has approved an increase to the Company’s share repurchase program. Hudson may now purchase up to $20 million in shares of its common stock, consisting of up to $10 million

October 25, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) October 23, 2024 Hudson Technologies, Inc.

August 23, 2024 EX-4.12

Hudson Technologies, Inc. 2024 Stock Incentive Plan (29)*

Exhibit 4.12 HUDSON TECHNOLOGIES, INC. 2024 STOCK INCENTIVE PLAN 1.            Purpose The 2024 Hudson Technologies, Inc. Stock Incentive Plan (the "Plan") is intended to provide incentives which will attract, retain, motivate and reward highly competent persons as non-employee directors, executive officers and other employees of, or consultants and advisors to, Hudson Technologies, Inc. (the "Com

August 23, 2024 EX-FILING FEES

Filing Fee Table

Exhibit 107 CALCULATION OF FILING FEE TABLE FORM S-8 (Form Type) HUDSON TECHNOLOGIES, INC.

August 23, 2024 S-8

As filed with the Securities and Exchange Commission on August 23, 2024

As filed with the Securities and Exchange Commission on August 23, 2024 Registration Statement No.

August 9, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 ☐ TRANSITION REPORT PURSUANT TO SEC

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

August 6, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) August 6, 2024 Hudson Technologies, Inc.

August 6, 2024 EX-99.1

HUDSON TECHNOLOGIES REPORTS SECOND quarter 2024 reSults Board Authorizes Share Repurchase Program

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS SECOND quarter 2024 reSults Board Authorizes Share Repurchase Program WOODCLIFF LAKE, NJ – August 6, 2024 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the second quarter and six months ended June 30, 2024. For the quarter ended June 30, 2024, Hudson reported revenues of $75.3 million, a decrease of 17% compared to revenues of $90.5 milli

July 30, 2024 EX-99.1

HUDSON TECHNOLOGIES ANNOUNCES APPOINTMENT OF BRIAN J. BERTAUX AS CHIEF FINANCIAL OFFICER

Exhibit 99.1 HUDSON TECHNOLOGIES ANNOUNCES APPOINTMENT OF BRIAN J. BERTAUX AS CHIEF FINANCIAL OFFICER Woodcliff Lake, NJ – July 30, 2024– Hudson Technologies, Inc. (NASDAQ: HDSN) a leading provider of innovative and sustainable refrigerant products and services to the Heating, Ventilation, Air Conditioning, and Refrigeration industry – and one of the nation’s largest refrigerant reclaimers – today

July 30, 2024 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) July 30, 2024 Hudson Technologies, Inc.

June 13, 2024 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) June 12, 2024 Hudson Technologies, Inc.

June 7, 2024 EX-99.1

HUDSON TECHNOLOGIES ANNOUNCES ACQUISITION OF USA REFRIGERANTS

Exhibit 99.1 HUDSON TECHNOLOGIES ANNOUNCES ACQUISITION OF USA REFRIGERANTS Woodcliff Lake, NJ – June 7, 2024– Hudson Technologies, Inc. (NASDAQ: HDSN) today announced the acquisition of substantially all of the assets of USA United Suppliers of America, Inc. d/b/a USA Refrigerants (“USA”) for $20.7 million, subject to customary post-closing adjustments, and up to an additional $2 million in potent

June 7, 2024 EX-10.2

First Amendment to Amended and Restated Credit Agreement and Limited Consent dated June 6, 2024 by and among Wells Fargo Bank, National Association, as Agent, Hudson Technologies, Inc., and the Borrowers and Lenders party thereto (1)

Exhibit 10.2 EXECUTION VERSION FIRST AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT AND LIMITED CONSENT THIS FIRST AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT AND LIMITED CONSENT (this “Amendment”), dated as of June 6, 2024, is entered into by and among WELLS FARGO BANK, NATIONAL ASSOCIATION, a national banking association (“Wells Fargo”), in its capacity as agent for the Lender Group a

June 7, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) June 6, 2024 Hudson Technologies, Inc.

June 7, 2024 EX-10.1

Asset Purchase Agreement dated June 6, 2024 by and among Hudson Technologies Company, USA United Suppliers of America, Inc. (d/b/a USA Refrigerants), B&B Jobber Services, Inc., and the equityholders signatory thereto (1)

Exhibit 10.1 EXECUTION COPY ASSET PURCHASE AGREEMENT This Asset Purchase Agreement (this “Agreement”), dated as of June 6, 2024, is entered into by and among Hudson Technologies Company, a Delaware corporation (“Buyer”), USA United Suppliers of America, Inc. (d/b/a USA Refrigerants), a Florida corporation (“USAR”), B&B Jobber Services, Inc., a Florida corporation (“B&B” and, collectively with USAR

May 8, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 ☐ TRANSITION REPORT PURSUANT TO SE

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

May 1, 2024 EX-99.1

HUDSON TECHNOLOGIES REPORTS FIRST quarter 2024 reSults

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS FIRST quarter 2024 reSults WOODCLIFF LAKE, NJ – MAY 1, 2024 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the first quarter ended March 31, 2024. For the quarter ended March 31, 2024, Hudson reported revenues of $65.3 million, a decrease of 15% compared to revenues of $77.2 million in the comparable 2023 period. The decrease is primarily

May 1, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) May 1, 2024 Hudson Technologies, Inc.

April 25, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A 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)) ¨ Defin

April 25, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.    )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

April 25, 2024 ARS

ARS

UNITEDSTATES SECURITIESANDEXCHANGECOMMISSION WASHINGTON,DC20549 FORM10-K ☒ ANNUALREPORTPURSUANTTOSECTION13OR15(d)OFTHESECURITIESEXCHANGEACTOF1934 ForthefiscalyearendedDecember31,2023 OR ☐ TRANSITIONREPORTPURSUANTTOSECTION13OR15(d)OFTHESECURITIESEXCHANGEACTOF1934 Forthetransitionperiodfrom to Commissionfilenumber1-13412 HudsonTechnologies,Inc.

March 14, 2024 EX-97

Hudson Technologies, Inc. Clawback Policy (27)

Exhibit 97 HUDSON TECHNOLOGIES, INC. CLAWBACK POLICY The Board of Directors (the “Board”) of Hudson Technologies, Inc. (the “Company”) believes that it is in the best interests of the Company and its shareholders to adopt this Clawback Policy (the “Policy”), which provides for the recovery of certain incentive compensation in the event of an Accounting Restatement (as defined below). This Policy i

March 14, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 ☐ TRANSITION REPORT PURSUANT TO SECTIO

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

March 14, 2024 EX-21

Subsidiaries of the Company. (28)

Exhibit 21: Subsidiaries of the Registrant Hudson Technologies Company incorporated in the State of Delaware Hudson Holdings, Inc.

March 6, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) March 6, 2024 Hudson Technologies, Inc.

March 6, 2024 EX-99.1

HUDSON TECHNOLOGIES REPORTS FOURTH quarter ANd YEAR END 2023 reSults

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS FOURTH quarter ANd YEAR END 2023 reSults WOODCLIFF LAKE, NJ – MARCH 6, 2024 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the fourth quarter and year ended December 31, 2023. For the quarter ended December 31, 2023, Hudson reported revenues of $44.9 million, a decrease of 5% compared to revenues of $47.4 million in the comparable 2022 per

February 14, 2024 SC 13G/A

HDSN / Hudson Technologies, Inc. / Riva Ridge Capital Management LP Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No.

February 12, 2024 SC 13G/A

HDSN / Hudson Technologies, Inc. / COOPER CREEK PARTNERS MANAGEMENT LLC - HDSN1231202313GA Passive Investment

SC 13G/A 1 HDSN13gA2023.txt HDSN1231202313GA | OMB APPROVAL | || |OMB NUMBER: | UNITED STATES |EXPIRES: | SECURITIES AND EXCHANGE COMMISSION | February 12, 2024 | Washington, D.C. 20549 |ESTIMATED AVERAGE | |BURDEN HOURS | |PER RESPONSE ...11 | SCHEDULE 13G | Under the Securities Exchange Act of 1934 (Amendment No. 17)* Hudson Technologies Inc (HDSN) - (Name of Issuer) Common Stock - (Title of Cla

January 26, 2024 SC 13G/A

HDSN / Hudson Technologies, Inc. / BlackRock Inc. Passive Investment

SC 13G/A 1 us4441441098012624.txt us4441441098012624.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: 1) HUDSON TECHNOLOGIES, INC - (Name of Issuer) Common Stock - (Title of Class of Securities) 444144109 - (CUSIP Number) December 31, 2023 - (Date of Event Which Requires Filing of this Statement) Check the appropria

November 7, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 ☐ TRANSITION REPORT PURSUANT T

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

November 1, 2023 EX-99.1

HUDSON TECHNOLOGIES REPORTS third quarter RESULTS

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS third quarter RESULTS WOODCLIFF LAKE, NJ – november 1, 2023 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the third quarter ended September 30, 2023. For the quarter ended September 30, 2023, Hudson reported revenues of $76.5 million, a decrease of 15% compared to revenues of $89.5 million in the third quarter of 2022. The decrease is pri

November 1, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) November 1, 2023 Hudson Technologies, Inc.

October 12, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) October 11, 2023 Hudson Technologies, Inc.

October 12, 2023 EX-99.1

HUDSON TECHNOLOGIES ANNOUNCES APPOINTMENT OF KAthleen l. houghton to board of directors

Exhibit 99.1 HUDSON TECHNOLOGIES ANNOUNCES APPOINTMENT OF KAthleen l. houghton to board of directors WoodclifF lake, nj – October 12, 2023 – Hudson Technologies, Inc. (NASDAQ: HDSN), a leading provider of innovative and sustainable refrigerant products and services to the Heating, Ventilation, Air Conditioning, and Refrigeration industry – and one of the nation’s largest refrigerant reclaimers – t

August 22, 2023 EX-99.1

HUDSON TECHNOLOGIES ANNOUNCES FULL REPAYMENT OF OUTSTANDING TERM DEBT

Exhibit 99.1 HUDSON TECHNOLOGIES ANNOUNCES FULL REPAYMENT OF OUTSTANDING TERM DEBT WOODCLIFF LAKE, NJ – August 21, 2023 – Hudson Technologies, Inc. (NASDAQ: HDSN) a leading provider of innovative and sustainable refrigerant products and services to the Heating, Ventilation, Air Conditioning, and Refrigeration industry–and one of the nation’s largest refrigerant reclaimers–today announced that the

August 22, 2023 8-K

Regulation FD Disclosure, Termination of a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) August 21, 2023 Hudson Technologies, Inc.

August 8, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 ☐ TRANSITION REPORT PURSUANT TO SEC

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

August 2, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) August 2, 2023 Hudson Technologies, Inc.

August 2, 2023 EX-99.1

HUDSON TECHNOLOGIES REPORTS Second QUARTER 2023 Results

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS Second QUARTER 2023 Results WOODCLIFF LAKE, NJ – August 2, 2023 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the second quarter ended June 30, 2023. For the quarter ended June 30, 2023, Hudson reported revenues of $90.5 million, a decrease of 13% compared to revenues of $103.9 million in the second quarter of 2022. The decrease is primar

June 8, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) June 7, 2023 Hudson Technologies, Inc.

May 9, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 ☐ TRANSITION REPORT PURSUANT TO SE

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

May 3, 2023 EX-99.1

HUDSON TECHNOLOGIES REPORTS FIrst QUARTER 2023 Results

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS FIrst QUARTER 2023 Results WOODCLIFF LAKE, NJ – MAY 3, 2023 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the first quarter ended March 31, 2023. For the quarter ended March 31, 2023, Hudson reported revenues of $77.2 million, a decrease of 8% compared to revenues of $84.3 million in the first quarter of 2022. The decrease is primarily re

May 3, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) May 3, 2023 Hudson Technologies, Inc.

April 26, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A 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)) ¨ Defin

April 26, 2023 ARS

ARS

UNITEDSTATES SECURITIESANDEXCHANGECOMMISSION WASHINGTON,DC20549 FORM10-K ☒ ANNUALREPORTPURSUANTTOSECTION13OR15(d)OFTHESECURITIESEXCHANGEACTOF1934 ForthefiscalyearendedDecember31,2022 OR ☐ TRANSITIONREPORTPURSUANTTOSECTION13OR15(d)OFTHESECURITIESEXCHANGEACTOF1934 Forthetransitionperiodfrom to Commissionfilenumber1-13412 HudsonTechnologies,Inc.

April 26, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.     )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 14, 2023 EX-21

Subsidiaries of the Company. (28)

Exhibit 21: Subsidiaries of the Registrant Hudson Technologies Company incorporated in the State of Delaware Hudson Holdings, Inc.

March 14, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 ☐ TRANSITION REPORT PURSUANT TO SECTIO

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

March 8, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) March 8, 2023 Hudson Technologies, Inc.

March 8, 2023 EX-99.1

HUDSON TECHNOLOGIES REPORTS FOURTH QUARTER Revenue Growth of 26%; Record Full YEAR 2022 revenue of $325.2 Million

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS FOURTH QUARTER Revenue Growth of 26%; Record Full YEAR 2022 revenue of $325.2 Million WOODCLIFF LAKE, NJ – MARCH 8, 2023 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the fourth quarter and year ended December 31, 2022. For the quarter ended December 31, 2022, Hudson reported revenues of $47.4 million, an increase of 26% compared to reven

February 23, 2023 8-K/A

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K/A (Amendment No.

February 15, 2023 SC 13G/A

HDSN / Hudson Technologies, Inc. / ArrowMark Colorado Holdings LLC Passive Investment

SC 13G/A 1 arrowmark-hdsn123122a6.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 6)* Hudson Technologies, Inc. (Name of Issuer) Common Stock, $0.01 par value (Title of Class of Securities) 444144109 (CUSIP Number) December 31, 2022 (Date of Event Which Requires Filing of this Statement) Check the app

February 13, 2023 SC 13G/A

HDSN / Hudson Technologies, Inc. / COOPER CREEK PARTNERS MANAGEMENT LLC - HDSN 13G Passive Investment

SC 13G/A 1 HDSN13gA.txt HDSN 13G | OMB APPROVAL | || |OMB NUMBER: | UNITED STATES |EXPIRES: | SECURITIES AND EXCHANGE COMMISSION | February 13, 2023 | Washington, D.C. 20549 |ESTIMATED AVERAGE | |BURDEN HOURS | |PER RESPONSE ...11 | SCHEDULE 13G | Under the Securities Exchange Act of 1934 (Amendment No. 17)* Hudson Technologies Inc (HDSN) - (Name of Issuer) Common Stock - (Title of Class of Securi

February 3, 2023 SC 13G

HDSN / Hudson Technologies, Inc. / BlackRock Inc. Passive Investment

SC 13G 1 us4441441098020323.txt us4441441098020323.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: ) HUDSON TECHNOLOGIES, INC - (Name of Issuer) Common Stock - (Title of Class of Securities) 444144109 - (CUSIP Number) December 31, 2022 - (Date of Event Which Requires Filing of this Statement) Check the appropriate

February 2, 2023 SC 13G/A

HDSN / Hudson Technologies, Inc. / Riva Ridge Capital Management LP Passive Investment

SC 13G/A 1 d993243013g-a.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2)* Hudson Technologies, Inc. (Name of Issuer) Common Stock, $0.01 par value (Title of Class of Securities) 444144109 (CUSIP Number) December 31, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate bo

January 19, 2023 CORRESP

HUDSON TECHNOLOGIES, INC. 300 Tice Boulevard, Suite 290 Woodcliff Lake, NJ 07677 845-735-6000 (Phone)

HUDSON TECHNOLOGIES, INC. 300 Tice Boulevard, Suite 290 Woodcliff Lake, NJ 07677 845-735-6000 (Phone) January 19, 2023 VIA EDGAR Division of Corporation Finance U.S. Securities and Exchange Commission 100 F Street NE Washington, DC 20549 Re: HUDSON TECHNOLOGIES, INC. (the “Company”) Registration Statement on Form S-3 (File No. 333-269221) Ladies and Gentlemen: Pursuant to Rule 461 under the Securi

January 18, 2023 LETTER

LETTER

United States securities and exchange commission logo January 18, 2023 Brian F. Coleman Chairman and Chief Executive Officer Hudson Technologies, Inc. 300 Tice Boulevard, Suite 290 Woodcliff Lake, NJ 07677 Re: Hudson Technologies, Inc. Registration Statement on Form S-3 Filed January 13, 2023 File No. 333-269221 Dear Brian F. Coleman: This is to advise you that we have not reviewed and will not re

January 13, 2023 EX-4.12

Form of Indenture

Exhibit 4.12 HUDSON TECHNOLOGIES, INC. AND Trustee INDENTURE Dated as of Debt Securities Reconciliation and tie between Trust Indenture Act of 1939, as amended, and the Indenture Trust Indenture Act Section Indenture Section (S)310(a)(1) 6.8 (a)(2) 6.8 (b) 6.9 (S)312(a) 7.1 (b) 7.2 (c) 7.2 (S)313(a) 7.3 (b)(2) 7.3 (c) 7.3 (d) 7.3 (S)314(a) 7.4 (c)(1) 1.2 (c)(2) 1.2 (e) 1.2 (f) 1.2 (S)316(a) (last

January 13, 2023 EX-FILING FEES

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) Hudson Technologies, Inc.

January 13, 2023 S-3

As filed with the Securities and Exchange Commission on January 13, 2023

S-3 1 tm231653-1s3.htm S-3 TABLE OF CONTENTS As filed with the Securities and Exchange Commission on January 13, 2023 Registration No. 333-       UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 HUDSON TECHNOLOGIES, INC. (Exact name of registrant as specified in its charter) New York 13-3641539 (State or other ju

November 8, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 ☐ TRANSITION REPORT PURSUANT T

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

November 2, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) November 2, 2022 Hudson Technologies, Inc.

November 2, 2022 EX-99.1

HUDSON TECHNOLOGIES REPORTS record THIRD Quarter 2022 reSults

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS record THIRD Quarter 2022 reSults WoodclifF lake, nj ? November 2, 2022 ? Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the third quarter ended September 30, 2022. For the quarter ended September 30, 2022, Hudson reported revenues of $89.5 million, an increase of 48% compared to revenues of $60.6 million in the comparable 2021 period. Third

October 3, 2022 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) September 30, 2022 Hudson Technologies, Inc.

October 3, 2022 EX-99.1

HUDSON TECHNOLOGIES Appoints Nicole bulgarino and Loan Mansy to board of directors

Exhibit 99.1 HUDSON TECHNOLOGIES Appoints Nicole bulgarino and Loan Mansy to board of directors WoodclifF lake, nj ? October 3, 2022 ? Hudson Technologies, Inc. (NASDAQ: HDSN), a leading provider of innovative and sustainable refrigerant products and services to the Heating, Ventilation, Air Conditioning, and Refrigeration industry ? and one of the nation?s largest refrigerant reclaimers ? today a

September 28, 2022 SC 13G/A

HDSN / Hudson Technologies, Inc. / Goldberg Capital Management Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. ) Hudson Technologies, Inc. - (Name of Issuer) Common Stock, Par Value $.000001 - (Title of Class of Securities) 444144109 - (CUSIP Number) 9/28/2022 - (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule

August 8, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 ☐ TRANSITION REPORT PURSUANT TO SEC

Table of Contents ? ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 ? FORM 10-Q ? ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ? For the quarterly period ended June 30, 2022 ? OR ? ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ? For the transition period from to ? Commission file number 1-13412 ? Hudson Technologies, Inc.

August 3, 2022 EX-99.1

HUDSON TECHNOLOGIES REPORTS record Second Quarter 2022 reSults; raises 2022 FORECAST and PROVIDES update ON longer-term Targets

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS record Second Quarter 2022 reSults; raises 2022 FORECAST and PROVIDES update ON longer-term Targets WoodclifF lake, nj ? August 3, 2022 ? Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the second quarter ended June 30, 2022. For the quarter ended June 30, 2022, Hudson reported revenues of $103.9 million, an increase of 72% compared to revenu

August 3, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) August 3, 2022 Hudson Technologies, Inc.

June 10, 2022 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) June 9, 2022 Hudson Technologies, Inc.

May 10, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 ☐ TRANSITION REPORT PURSUANT TO SE

Table of Contents ? ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 ? FORM 10-Q ? ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ? For the quarterly period ended March 31, 2022 ? OR ? ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ? For the transition period from to ? Commission file number 1-13412 ? Hudson Technologies, Inc.

May 4, 2022 EX-99.1

HUDSON TECHNOLOGIES REPORTS record First Quarter 2022 reSults

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS record First Quarter 2022 reSults WoodclifF lake, nj ? MAy 4, 2022 ? Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the first quarter ended March 31, 2022. For the quarter ended March 31, 2022, Hudson reported revenues of $84.3 million, an increase of 149% compared to revenues of $33.8 million in the comparable 2021 period. First quarter rev

May 4, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) May 4, 2022 Hudson Technologies, Inc.

April 26, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.     )

? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

April 26, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A 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)) ? Defin

March 24, 2022 EX-10.56

Form of Stock Appreciation Rights Award Agreement (27)

Exhibit 10.56 STOCK APPRECIATION RIGHTS AWARD HUDSON TECHNOLOGIES, INC. AGREEMENT made as of [DATE] (the "Grant Date") between Hudson Technologies, Inc. (the "Company"), a New York corporation, having a principal place of business at PO Box 1541, One Blue Hill Plaza, 14th Floor, Pearl River, New York 10965, and [[FIRSTNAME]] [[LASTNAME]] (the "Grantee"). WHEREAS, the Company desires to grant to th

March 24, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 ☐ TRANSITION REPORT PURSUANT TO SECTIO

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

March 24, 2022 EX-21

Subsidiaries of the Company. (36)

Exhibit 21: Subsidiaries of the Registrant Hudson Technologies Company incorporated in the State of Delaware Hudson Holdings, Inc.

March 22, 2022 SC 13G

HDSN / Hudson Technologies, Inc. / Goldberg Capital Management Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. ) Hudson Technologies, Inc. - (Name of Issuer) Common Stock, Par Value $.000001 - (Title of Class of Securities) 444144109 - (CUSIP Number) 3/18/2022 - (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pu

March 16, 2022 NT 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 12b-25 SEC File Number: 1-13412 NOTIFICATION OF LATE FILING Cusip Number: 444144 10 9 (Check one) x Form 10-K ? Form 20-F ? Form 11-K ? Form 10-Q ? Form 10-D ? Form N-CEN ? Form N-CSR For Period Ended: December 31, 2021 ? Transition Report on Form 10-K ? Transition Report on Form 20-F ? Transition Report on Form 11-K ? Transition Report on Form 10-Q For the Transition Period Ended: Nothing in this form shall be construed to imply that the Commission has verified any information contained herein.

March 8, 2022 EX-99.1

HUDSON TECHNOLOGIES REPORTS record FOURTH quarter ANd YEAR END 2021 reSults

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS record FOURTH quarter ANd YEAR END 2021 reSults WOODCLIFF LAKE, nJ ? MARCH 8, 2022 ? Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the fourth quarter and year ended December 31, 2021. For the quarter ended December 31, 2021, Hudson reported revenues of $37.8 million, an increase of 71% compared to revenues of $22.1 million in the comparable

March 8, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) March 8, 2022 Hudson Technologies, Inc.

March 3, 2022 EX-10.2

Guaranty and Security Agreement dated March 2, 2022 by and among the Grantors named therein and TCW Asset Management Company LLC, as Agent

Exhibit 10.2 GUARANTY AND SECURITY AGREEMENT This GUARANTY AND SECURITY AGREEMENT (this "Agreement"), dated as of March 2, 2022, by and among the Persons listed on the signature pages hereof as "Grantors" and those additional entities that hereafter become parties hereto by executing the form of Joinder attached hereto as Annex 1 (each, a "Grantor" and collectively, the "Grantors"), and TCW ASSET

March 3, 2022 EX-10.1

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

Exhibit 10.1 CREDIT AGREEMENT by and among TCW ASSET MANAGEMENT COMPANY LLC, as Agent, THE LENDERS THAT ARE PARTIES HERETO as the Lenders, HUDSON TECHNOLOGIES INC., as Parent, and HUDSON HOLDINGS, INC., HUDSON TECHNOLOGIES COMPANY, and THE OTHER BORROWERS THAT ARE PARTIES FROM TIME TO TIME HERETO, collectively, as the Borrowers Dated as of March 2, 2022 TABLE OF CONTENTS Page 1. DEFINITIONS AND CO

March 3, 2022 EX-99.1

Hudson Technologies Enters Into New $85 Million Term Loan and Increases ABL Facility to a Total of $90 Million

Exhibit 99.1 Hudson Technologies Enters Into New $85 Million Term Loan and Increases ABL Facility to a Total of $90 Million Woodcliff Lake, NJ ? March 2, 2022 ? Hudson Technologies, Inc. (NASDAQ: HDSN), a leading provider of innovative and sustainable refrigerant products and services to the Heating, Ventilation, Air Conditioning, and Refrigeration industry ? and one of the nation?s largest refrig

March 3, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Entry into a Material Definitive Agreement, Termination of a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) March 2, 2022 Hudson Technologies, Inc.

March 3, 2022 EX-3.1

Amended and Restated By-Laws. (26)

Exhibit 3.1 AMENDED AND RESTATED BY-LAWS OF HUDSON TECHNOLOGIES, INC. (a New York corporation) (With all amendments through March 2, 2022) ARTICLE I OFFICES, SEAL AND FISCAL YEAR 1. OFFICES: The principal office of the Corporation shall be at such location as the Board of Directors of the Corporation (the ?Board of Directors?) may from time to time designate. The Corporation may also have offices

March 3, 2022 EX-10.3

Amended and Restated Credit Agreement dated March 2, 2022 by and among Wells Fargo Bank, National Association, as Agent, Hudson Technologies, Inc., and the Borrowers and Lenders party thereto (26)

Exhibit 10.3 AMENDED AND RESTATED CREDIT AGREEMENT by and among WELLS FARGO BANK, NATIONAL ASSOCIATION, as Agent, THE LENDERS THAT ARE PARTIES HERETO as the Lenders, HUDSON TECHNOLOGIES INC., as Parent, and HUDSON HOLDINGS, INC., HUDSON TECHNOLOGIES COMPANY, and THE OTHER BORROWERS THAT ARE PARTIES FROM TIME TO TIME HERETO, collectively, as the Borrowers Dated as of March 2, 2022 Table of Contents

March 3, 2022 EX-10.4

First Amendment to Guaranty and Security Agreement dated March 2, 2022 by and among the Grantors named therein and Wells Fargo Bank, National Association, as Agent (26)

Exhibit 10.4 Execution Version FIRST AMENDMENT TO GUARANTY AND SECURITY AGREEMENT THIS FIRST AMENDMENT TO GUARANTY AND SECURITY AGREEMENT (this ?Amendment?), dated as of March 2, 2022, is entered into by and among WELLS FARGO BANK, NATIONAL ASSOCIATION, a national banking association (?Wells Fargo?), as administrative agent for each member of the Lender Group and the Bank Product Providers (in suc

February 14, 2022 SC 13G/A

HDSN / Hudson Technologies, Inc. / ArrowMark Colorado Holdings LLC Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No.

February 14, 2022 SC 13G

HDSN / Hudson Technologies, Inc. / COOPER CREEK PARTNERS MANAGEMENT LLC - HDSN2213G Passive Investment

| OMB APPROVAL | || |OMB NUMBER: | UNITED STATES |EXPIRES: | SECURITIES AND EXCHANGE COMMISSION | February 14, 2022 | Washington, D.

February 10, 2022 SC 13G/A

HDSN / Hudson Technologies, Inc. / CALM WATERS PARTNERSHIP - AMENDMENT NO. 1 TO SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* HUDSON TECHNOLOGIES, INC. (Name of Issuer) Common Stock Par Value $0.01 (Title of Class of Securities) 444144109 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pur

February 9, 2022 SC 13G/A

HDSN / Hudson Technologies, Inc. / Zugibe Maura - SC 13G/A Passive Investment

SC 13G/A 1 tm225853d1sc13ga.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G/A (Amendment No. 1)* Hudson Technologies, Inc. (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) 444144 10 9 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate t

February 7, 2022 SC 13G/A

HDSN / Hudson Technologies, Inc. / Riva Ridge Capital Management LP Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No.

November 15, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ⌧ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 ◻ TRANSITION REPORT PURSUANT T

Table of Contents ? ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 ? FORM 10-Q ? ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ? For the quarterly period ended September 30, 2021 ? OR ? ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ? For the transition period from to ? Commission file number 1-13412 ? Hudson Technologies, Inc.

November 3, 2021 EX-99.1

HUDSON TECHNOLOGIES REPORTS Third quarter 2021 reSults

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS Third quarter 2021 reSults pearl river, ny ? November 3, 2021 ? Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the third quarter and nine months ended September 30, 2021. For the quarter ended September 30, 2021, Hudson reported revenues of $60.6 million, an increase of 46% compared to revenues of $41.5 million in the comparable 2020 period.

November 3, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) November 3, 2021 Hudson Technologies, Inc.

October 8, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) October 7, 2021 Hudson Technologies, Inc.

August 11, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q ⌧ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 ◻ TRANSITION REPORT PURSUANT TO SEC

Table of Contents ? ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 ? FORM 10-Q ? ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ? For the quarterly period ended June 30, 2021 ? OR ? ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ? For the transition period from to ? Commission file number 1-13412 ? Hudson Technologies, Inc.

August 4, 2021 EX-99.1

HUDSON TECHNOLOGIES REPORTS record second quarter 2021 revenues

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS record second quarter 2021 revenues pearl river, ny ? August 4, 2021 ? Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the second quarter and six months ended June 30, 2021. For the quarter ended June 30, 2021, Hudson reported revenues of $60.5 million, an increase of 27% compared to revenues of $47.7 million in the comparable 2020 period. Se

August 4, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) August 4, 2021 Hudson Technologies, Inc.

July 1, 2021 SC 13G

HDSN / Hudson Technologies, Inc. / CALM WATERS PARTNERSHIP - SCHEDULE 13G Passive Investment

SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* HUDSON TECHNOLOGIES, INC. (Name of Issuer) Common Stock Par Value $0.01 (Title of Class of Securities) 444144109 (CUSIP Number) June 29, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the r

June 29, 2021 EX-99.1

HUDSON TECHNOLOGIES RECEIVES 5-YEAR RENEWAL AWARD FOR DEPARTMENT OF DEFENSE CONTRACT; extending the toTal contract period to ten years

Exhibit 99.1 HUDSON TECHNOLOGIES RECEIVES 5-YEAR RENEWAL AWARD FOR DEPARTMENT OF DEFENSE CONTRACT; extending the toTal contract period to ten years PEARL RIVER, NY ? June 29, 2021? Hudson Technologies, Inc. (NASDAQ: HDSN) announced today that the United States Defense Logistics Agency (?DLA?) has exercised its renewal option to contract Hudson for an additional five years as the prime contractor f

June 29, 2021 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 29, 2021 Hudson Technologies, Inc.

June 11, 2021 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 10, 2021 Hudson Technologies, Inc.

May 25, 2021 SC 13D

HDSN / Hudson Technologies, Inc. / COLEMAN BRIAN F - SC 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13D (Amendment No.

May 24, 2021 SC 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )*

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No.

May 11, 2021 10-Q

Quarterly Report - FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

May 5, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

8-K 1 tm2114946d18k.htm FORM 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 5, 2021 Hudson Technologies, Inc. (Exact Name of Registrant as Specified in Charter) New York (State or Other Jurisdiction of Incorporation) 1-13412

May 5, 2021 EX-99.1

HUDSON TECHNOLOGIES REPORTS FIRST Quarter 2021 RESULTS

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS FIRST Quarter 2021 RESULTS pearl river, ny ? MaY 5, 2021 ? Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the first quarter ended March 31, 2021. For the quarter ended March 31, 2021, Hudson reported revenues of $33.8 million, a decrease of 7% compared to revenues of $36.4 million in the comparable 2020 period. The decrease in revenue was pr

May 4, 2021 SC 13D/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13D (Amendment No. 9)**

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13D (Amendment No.

May 4, 2021 SC 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G (Amendment No. )*

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G (Amendment No.

April 28, 2021 DEF 14A

- DEF 14A

? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 ? SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

April 28, 2021 DEFA14A

- DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 12, 2021 EX-10.54

Form of Non-Qualified Stock Option Agreement under the 2020 Stock Incentive Plan with full vesting upon issuance (25)*

Exhibit 10.54 NON-QUALIFIED STOCK OPTION AGREEMENT HUDSON TECHNOLOGIES, INC. AGREEMENT made as of (insert date) (the "Grant Date") between Hudson Technologies, Inc. (the "Company"), a New York corporation, having a principal place of business at PO Box 1541, One Blue Hill Plaza, 14th Floor, Pearl River, New York 10965, and (insert name of Grantee) (the "Grantee"). WHEREAS, the Company desires to g

March 12, 2021 EX-10.52

Form of Incentive Stock Option Agreement under the 2020 Stock Incentive Plan with full vesting upon issuance (25)*

Exhibit 10.52 INCENTIVE STOCK OPTION AGREEMENT HUDSON TECHNOLOGIES, INC. AGREEMENT made as of the (insert date) (the "Grant Date") between Hudson Technologies, Inc. (the "Company"), a New York corporation, having a principal place of business at PO Box 1541, One Blue Hill Plaza, 14th Floor, Pearl River, New York 10965, and (insert name of Grantee) (the "Grantee"). WHEREAS, the Company desires to g

March 12, 2021 EX-10.55

Form of Non-Qualified Stock Option Agreement under the 2020 Stock Incentive Plan with vesting in equal installments over a specified period of time (25)*

Exhibit 10.55 NON-QUALIFIED STOCK OPTION AGREEMENT HUDSON TECHNOLOGIES, INC. AGREEMENT made as of (insert date) (the "Grant Date") between Hudson Technologies, Inc. (the "Company"), a New York corporation, having a principal place of business at PO Box 1541, One Blue Hill Plaza, 14th Floor, Pearl River, New York 10965, and (insert name of Grantee) (the "Grantee"). WHEREAS, the Company desires to g

March 12, 2021 10-K

Annual Report - FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc. (E

March 12, 2021 EX-10.53

Form of Incentive Stock Option Agreement under the 2020 Stock Incentive Plan with vesting in equal installments over a specified period of time (25)*

Exhibit 10.53 INCENTIVE STOCK OPTION AGREEMENT HUDSON TECHNOLOGIES, INC. AGREEMENT made as of the (insert date) (the "Grant Date") between Hudson Technologies, Inc. (the "Company"), a New York corporation, having a principal place of business at PO Box 1541, One Blue Hill Plaza, 14th Floor, Pearl River, New York 10965, and (insert name of Grantee) (the "Grantee"). WHEREAS, the Company desires to g

March 12, 2021 EX-10.56

Form of Non-Qualified Stock Option Agreement under the 2020 Stock Incentive Plan with conditional vesting provisions (24)*

Exhibit 10.56 NON-QUALIFIED STOCK OPTION AGREEMENT HUDSON TECHNOLOGIES, INC. AGREEMENT made as of (grant date) (the "Grant Date") between Hudson Technologies, Inc. (the "Company"), a New York corporation, having a principal place of business at PO Box 1541, One Blue Hill Plaza, 14th Floor, Pearl River, New York 10965, and (insert name of Grantee) (the "Grantee"). WHEREAS, the Company desires to gr

March 12, 2021 EX-21

Subsidiaries of the Company. (34)

Exhibit 21: Subsidiaries of the Registrant Hudson Technologies Company incorporated in the State of Delaware Hudson Holdings, Inc.

March 3, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) March 3, 2021 Hudson Technologies, Inc.

March 3, 2021 EX-99.1

HUDSON TECHNOLOGIES REPORTS FOURTH Quarter 2020 RESULTS

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS FOURTH Quarter 2020 RESULTS pearl river, ny – March 3, 2021 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the fourth quarter and year ended December 31, 2020. For the quarter ended December 31, 2020, Hudson reported revenues of $22.1 million, a decrease of 14% compared to revenues of $25.8 million in the comparable 2019 period. The decrea

February 16, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 4)* Hudson Technologies, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No.

February 12, 2021 SC 13G

HDSN1362020

| OMB APPROVAL | || |OMB NUMBER: | UNITED STATES |EXPIRES: | SECURITIES AND EXCHANGE COMMISSION | February 12, 2021 | Washington, D.

February 8, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 3)* HUDSON TECHNOLOGIES, INC. (Name of Issuer) Common Stock Par Value $0.01 (Title of Class of Securities) (

SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 3)* HUDSON TECHNOLOGIES, INC. (Name of Issuer) Common Stock Par Value $0.01 (Title of Class of Securities) 444144109 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate

January 12, 2021 S-3/A

- S-3/A

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on January 12, 2021 Registration No.

January 6, 2021 CORRESP

-

CORRESP 1 filename1.htm HUDSON TECHNOLOGIES, INC. One Blue Hill Plaza Pearl River, NY 10965 845-735-6000 (Phone) January 6, 2021 Division of Corporation Finance U.S. Securities and Exchange Commission 100 F Street NE Washington, DC 20549 Re: HUDSON TECHNOLOGIES, INC. (the “Company”) Registration Statement on Form S-3 (File No. 333-251646) Ladies and Gentlemen: In connection with the above-captione

January 4, 2021 TEXT-EXTRACT

-

United States securities and exchange commission logo January 4, 2021 Nat Krishnamurti Chief Financial Officer Hudson Technologies, Inc.

January 4, 2021 LETTER

LETTER

United States securities and exchange commission logo January 4, 2021 Nat Krishnamurti Chief Financial Officer Hudson Technologies, Inc.

December 29, 2020 EX-99.1

HUDSON TECHNOLOGIES APPLAUDS adoption of Omnibus/COVID-19 Relief which INCLUDes THE PHASEDOWN OF HFC PRODUCTION

Exhibit 99.1 HUDSON TECHNOLOGIES APPLAUDS adoption of Omnibus/COVID-19 Relief which INCLUDes THE PHASEDOWN OF HFC PRODUCTION pearl river, ny – DECember 29, 2020 – Hudson Technologies, Inc. (NASDAQ: HDSN), a leading provider of innovative and sustainable solutions for optimizing performance and improving efficiency of commercial and industrial chiller plants and refrigeration systems, commented tod

December 29, 2020 8-K

Financial Statements and Exhibits, Other Events - FORM 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) December 29, 2020 Hudson Technologies, Inc.

December 23, 2020 S-3

- S-3

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on December 23, 2020 Registration No.

December 23, 2020 EX-4.12

Form of Indenture

Exhibit 4.12 HUDSON TECHNOLOGIES, INC. AND Trustee INDENTURE Dated as of Debt Securities Reconciliation and tie between Trust Indenture Act of 1939, as amended, and the Indenture Trust Indenture Act Section Indenture Section (S)310(a)(1) 6.8 (a)(2) 6.8 (b) 6.9 (S)312(a) 7.1 (b) 7.2 (c) 7.2 (S)313(a) 7.3 (b)(2) 7.3 (c) 7.3 (d) 7.3 (S)314(a) 7.4 (c)(1) 1.2 (c)(2) 1.2 (e) 1.2 (f) 1.2 (S)316(a) (last

November 10, 2020 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 ¨ TRANSITION REPORT PURSUANT T

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

November 5, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

8-K 1 tm2034797d18k.htm FORM 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) November 5, 2020 Hudson Technologies, Inc. (Exact Name of Registrant as Specified in Charter) New York (State or Other Jurisdiction of Incorporation) 1-1

November 5, 2020 EX-99.1

HUDSON TECHNOLOGIES REPORTS THIRD Quarter 2020 RESULTS

EX-99.1 2 tm2034797d1ex99-1.htm EXHIBIT 99.1 Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS THIRD Quarter 2020 RESULTS pearl river, ny – November 5, 2020 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the third quarter and nine months ended September 30, 2020. For the quarter ended September 30, 2020, Hudson reported revenues of $41.5 million, a decrease of 9% compared to revenues of $

September 16, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

8-K 1 tm2030585-18k.htm FORM 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) September 14, 2020 Hudson Technologies, Inc. (Exact Name of Registrant as Specified in Charter) New York (State or Other Jurisdiction of Incorporation) 1

September 16, 2020 EX-99.1

HUDSON TECHNOLOGIES NAMES KENNETH GAGLIONE VICE PRESIDENT - OPERATIONS

Exhibit 99.1 HUDSON TECHNOLOGIES NAMES KENNETH GAGLIONE VICE PRESIDENT - OPERATIONS PEARL RIVER, NY – September 14, 2020– Hudson Technologies, Inc. (NASDAQ: HDSN) (the “Company”) today announced the appointment of Kenneth Gaglione to the Company’s newly created role of Vice President - Operations. Mr. Gaglione most recently served as Global Marketing Director for aftermarket refrigerants at Honeyw

September 16, 2020 EX-99.2

HUDSON TECHNOLOGIES ANNOUNCES APPOINTMENT OF KATHLEEN L. HOUGHTON AS AN EXECUTIVE OFFICER

Exhibit 99.2 HUDSON TECHNOLOGIES ANNOUNCES APPOINTMENT OF KATHLEEN L. HOUGHTON AS AN EXECUTIVE OFFICER PEARL RIVER, NY – September 16, 2020– Hudson Technologies, Inc. (NASDAQ: HDSN) (the “Company”) today announced the appointment of Kathleen L. Houghton, as an executive officer of the Company. Ms. Houghton has served as Hudson’s Vice President – Sales and Marketing since May 2019. She joined the C

September 16, 2020 EX-10.1

Agreement dated September 14, 2020 between the Company and Kenneth Gaglione (31)*

Exhibit 10.1 AGREEMENT THIS AGREEMENT (the “Agreement”) is made as of the 14th day of September, 2020 by and between Hudson Technologies, Inc., P.O. Box 1541, One Blue Hill Plaza, Pearl River, New York 10965, Hudson Technologies Company, P.O. Box 1541, One Blue Hill Plaza, Pearl River, New York 10965, and Aspen Refrigerants, Inc., P.O. Box 1541, One Blue Hill Plaza, Pearl River, New York, 10965 (h

September 16, 2020 EX-10.2

Amended and Restated Agreement dated September 30, 2019 between the Company and Kathleen L. Houghton (22)*

Exhibit 10.2 AMENDED AND RESTATED AGREEMENT THIS AMENDED AND RESTATED AGREEMENT (the “Agreement”) is made as of the 30 day of September, 2019 by and between Hudson Technologies, Inc., P.O. Box 1541, One Blue Hill Plaza, Pearl River, New York 10965 (“HTI”), Hudson Technologies Company, P.O. Box 1541, One Blue Hill Plaza, Pearl River, New York 10965 (“HTC” and hereinafter HTI, HTC and their Affiliat

September 1, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits - FORM 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) September 1, 2020 Hudson Technologies, Inc.

September 1, 2020 EX-99.1

HUDSON TECHNOLOGIES Appoints Stephen P. Mandracchia to Board of Directors

EX-99.1 2 tm2029371d1ex99-1.htm EXHIBIT 99.1 Exhibit 99.1 HUDSON TECHNOLOGIES Appoints Stephen P. Mandracchia to Board of Directors pearl river, ny – SEPTEMBER 1, 2020 – Hudson Technologies, Inc. (NASDAQ: HDSN) (the “Company”) today announced the appointment of Stephen P. Mandracchia to its Board of Directors. Mr. Mandracchia fills the Board vacancy resulting from the passing of Kevin J. Zugibe in

August 11, 2020 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) August 11, 2020 Hudson Technologies, Inc.

August 11, 2020 EX-99.1

HUDSON TECHNOLOGIES REGAINS COMPLIANCE WITH NASDAQ MINIMUM CLOSING BID PRICE RULE

Exhibit 99.1 HUDSON TECHNOLOGIES REGAINS COMPLIANCE WITH NASDAQ MINIMUM CLOSING BID PRICE RULE PEARL RIVER, NY – August 11, 2020 – Hudson Technologies, Inc. (NASDAQ: HDSN) today announced that it received a letter from The Nasdaq Stock Market LLC (“Nasdaq”) indicating that the closing bid price of the Company’s common stock has been at $1.00 per share or greater for ten consecutive business days (

August 5, 2020 EX-99.1

HUDSON TECHNOLOGIES REPORTS Second Quarter 2020 Net Income of $2.4 Million or $0.06 Per share

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS Second Quarter 2020 Net Income of $2.4 Million or $0.06 Per share pearl river, ny – August 5, 2020 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the second quarter and six months ended June 30, 2020. For the quarter ended June 30, 2020, Hudson reported revenues of $47.7 million, a decrease of 14.8% compared to revenues of $56.0 million in

August 5, 2020 10-Q

Quarterly Report - FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

August 5, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

8-K 1 tm2026366d18k.htm FORM 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) August 5, 2020 Hudson Technologies, Inc. (Exact Name of Registrant as Specified in Charter) New York (State or Other Jurisdiction of Incorporation) 1-134

August 3, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Results of Operations and Financial Condition

8-K 1 tm2026035d18k.htm FORM 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) July 29, 2020 Hudson Technologies, Inc. (Exact Name of Registrant as Specified in Charter) New York (State or Other Jurisdiction of Incorporation) 1-1341

July 20, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) July 15, 2020 Hudson Technologies, Inc.

July 20, 2020 EX-10.1

Fourth Amended and Restated Agreement dated as of June 24, 2020 between the Registrant and Brian F. Coleman (21)*

Exhibit 10.1 FOURTH AMENDED AND RESTATED AGREEMENT THIS FOURTH AMENDED AND RESTATED AGREEMENT (this “Agreement”) is made as of the 24th day of June, 2020 by and between Hudson Technologies, Inc., P.O. Box 1541, One Blue Hill Plaza, Pearl River, New York 10965, Hudson Technologies Company, P.O. Box 1541, One Blue Hill Plaza, Pearl River, New York 10965 and Aspen Refrigerants, Inc., P.O. Box 1541, O

July 20, 2020 EX-99.1

HUDSON TECHNOLOGIES NAMES BRIAN F. COLEMAN CHAIRMAN OF THE BOARD, PRESIDENT & CHIEF EXECUTIVE OFFICER

Exhibit 99.1 HUDSON TECHNOLOGIES NAMES BRIAN F. COLEMAN CHAIRMAN OF THE BOARD, PRESIDENT & CHIEF EXECUTIVE OFFICER PEARL RIVER, NY – July 20, 2020– Hudson Technologies, Inc. (NASDAQ: HDSN) (the “Company”) today announced that its Board of Directors has appointed Brian F. Coleman Chairman of the Board, President and Chief Executive Officer, roles he had assumed on an interim basis following the pas

June 30, 2020 S-8

- S-8

As filed with the Securities and Exchange Commission on June 30, 2020 Registration Statement No.

June 30, 2020 EX-4.12

Hudson Technologies, Inc. 2020 Stock Incentive Plan (23)*

Exhibit 4.12 HUDSON TECHNOLOGIES, INC. 2020 STOCK INCENTIVE PLAN 1. Purpose The 2020 Hudson Technologies, Inc. Stock Incentive Plan (the "Plan") is intended to provide incentives which will attract, retain, motivate and reward highly competent persons as non-employee directors, executive officers and other employees of, or consultants and advisors to, Hudson Technologies, Inc. (the "Company") or a

June 24, 2020 EX-99.1

HUDSON TECHNOLOGIES ANNOUNCES THE PASSING OF CEO KEVIN. J. ZUGIBE

Exhibit 99.1 HUDSON TECHNOLOGIES ANNOUNCES THE PASSING OF CEO KEVIN. J. ZUGIBE pearl river, ny – JUNE 24, 2020 – Hudson Technologies, Inc. (NASDAQ: HDSN) today issued the following statement: “It is with great sadness that we announce that Kevin J. Zugibe, Chairman of the Board and Chief Executive Officer of Hudson Technologies, Inc., passed away unexpectedly yesterday. The entire Hudson family mo

June 24, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

8-K 1 tm2023323d18k.htm FORM 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 23, 2020 Hudson Technologies, Inc. (Exact Name of Registrant as Specified in Charter) New York (State or Other Jurisdiction of Incorporation) 1-1341

June 12, 2020 8-K

Submission of Matters to a Vote of Security Holders

8-K 1 tm2022518d18k.htm FORM 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 11, 2020 Hudson Technologies, Inc. (Exact Name of Registrant as Specified in Charter) New York (State or Other Jurisdiction of Incorporation) 1-1341

May 15, 2020 EX-10.2

Fifth Amendment to Term Loan and Credit and Security Agreement dated April 23, 2020 (29)

EX-10.2 3 tm2014556d1ex10-2.htm EXHIBIT 10.2 Exhibit 10.2 EXECUTION VERSION FIFTH AMENDMENT TO TERM LOAN CREDIT AND SECURITY AGREEMENT THIS FIFTH AMENDMENT TO TERM LOAN CREDIT AND SECURITY AGREEMENT (this “Amendment”), dated as of April 23, 2020, is by and among Hudson Technologies Company, a Tennessee corporation (“Hudson Technologies”), HUDSON HOLDINGS, INC., a Nevada corporation (“Holdings”), a

May 15, 2020 10-Q

The Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2020;

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc.

May 15, 2020 EX-10.1

First Amendment to Credit Agreement dated April 23, 2020 with Wells Fargo Bank, National Association (29)

Exhibit 10.1 EXECUTION VERSION FIRST AMENDMENT TO CREDIT AGREEMENT THIS FIRST AMENDMENT TO CREDIT AGREEMENT (this “Amendment”), dated as of April 23, 2020, is entered into by and among WELLS FARGO BANK, NATIONAL ASSOCIATION, a national banking association (“Wells Fargo”), in its capacity as agent for the Lender Group and the Bank Product Providers (in such capacity, together with its successors an

May 6, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

8-K 1 tm2018490d18k.htm FORM 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 6, 2020 Hudson Technologies, Inc. (Exact Name of Registrant as Specified in Charter) New York (State or Other Jurisdiction of Incorporation) 1-13412

May 6, 2020 EX-99.1

HUDSON TECHNOLOGIES REPORTS first quarter 2020 REVENUES OF $36.4 MILLION, gross MARGIN of 23% AND LIQUIDITY OF $27 MILLION

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS first quarter 2020 REVENUES OF $36.4 MILLION, gross MARGIN of 23% AND LIQUIDITY OF $27 MILLION pearl river, ny – MaY 6, 2020 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the first quarter ended March 31, 2020. For the quarter ended March 31, 2020, Hudson reported revenues of $36.4 million, a 5% increase compared to $34.7 million in the c

April 28, 2020 DEF 14A

our proxy statement filed with the SEC on April 28, 2020;

DEF 14A 1 tm2015040-3def14a.htm DEF 14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.     ) Filed by the registrant ☒ Filed by a party other than the registrant ☐ Check the appropriate box: ☐ Preliminary proxy statement ☐ Confidential, For Use of the Commission Only

April 28, 2020 DEFA14A

- DEFA14A

DEFA14A 1 tm2015040d4defa14a.htm DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A 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

April 20, 2020 8-K

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing

8-K 1 tm2016366d18k.htm FORM 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 17, 2020 Hudson Technologies, Inc. (Exact Name of Registrant as Specified in Charter) New York (State or Other Jurisdiction of Incorporation) 1-134

April 9, 2020 PRE 14A

HDSN / Hudson Technologies, Inc. PRE 14A - - PRE 14A

PRE 14A 1 tm2015040-2pre14a.htm PRE 14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.     ) Filed by the registrant ☒ Filed by a party other than the registrant ☐ Check the appropriate box: ☒ Preliminary proxy statement ☐ Confidential, For Use of the Commission Only

March 13, 2020 EX-21

Subsidiaries of the Company. (29)

Exhibit 21: Subsidiaries of the Registrant Hudson Technologies Company incorporated in the State of Tennessee Hudson Holdings, Inc.

March 13, 2020 EX-4.1

Description of Equity Securities. (24)

EX-4.1 2 tm205284d1ex4-1.htm EXHIBIT 4.1 Exhibit 4.1: DESCRIPTION OF COMMON STOCK The following description summarizes the material terms of Hudson Technologies, Inc. (“Hudson”) common stock. Because it is only a summary, it does not contain all the information that may be important to you. For a complete description, you should refer to our certificate of incorporation, as amended, and amended an

March 13, 2020 10-K

The Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2019;

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13412 Hudson Technologies, Inc. (E

March 4, 2020 EX-99.1

HUDSON TECHNOLOGIES REPORTS Fourth quarter 2019 RESULTS

Exhibit 99.1 HUDSON TECHNOLOGIES REPORTS Fourth quarter 2019 RESULTS pearl river, ny – March 4, 2020 – Hudson Technologies, Inc. (NASDAQ: HDSN) announced results for the fourth quarter and year ended December 31, 2019. For the quarter ended December 31, 2019 Hudson reported revenues of $25.8 million, slightly higher than revenues of $25.7 million in the comparable 2018 period. Gross margin in the

March 4, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

8-K 1 tm2011513d18k.htm 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) March 4, 2020 Hudson Technologies, Inc. (Exact Name of Registrant as Specified in Charter) New York (State or Other Jurisdiction of Incorporation) 1-13412 13-

February 14, 2020 SC 13G/A

HDSN / Hudson Technologies, Inc. / Arrowpoint Asset Management, LLC - SCHEDULE 13G HOLDINGS REPORT AMENDMENT Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No.

February 12, 2020 SC 13G/A

HDSN / Hudson Technologies, Inc. / DIMENSIONAL FUND ADVISORS LP - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 dfs318.htm SCHEDULE 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2)* HUDSON TECHNOLOGIES INC (Name of Issuer) Common Stock (Title of Class of Securities) 444144109 (CUSIP Number) December 31, 2019 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to desi

February 12, 2020 SC 13G/A

HDSN / Hudson Technologies, Inc. / PEKIN SINGER STRAUSS ASSET MANAGEMENT /IL - PEKIN SINGER STRAUSS ASSET MANAGEMENT, INC Passive Investment

SC 13G/A 1 hdsna121220.htm PEKIN SINGER STRAUSS ASSET MANAGEMENT, INC UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* HUDSON TECHNOLOGIES INC COM (Name of Issuer) Common (Title of Class of Securities) 444144109 (CUSIP Number) December 31, 2019 (Date of Event which Requires Filing of this Statement) Ch

February 12, 2020 SC 13G/A

HDSN / Hudson Technologies, Inc. / GRANAHAN INVESTMENT MANAGEMENT INC/MA - SC 13G/A Passive Investment

SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* Hudson Technologies, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 444144109 (CUSIP Number) December 31, 2019 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to

February 11, 2020 SC 13G/A

HDSN / Hudson Technologies, Inc. / COOPER CREEK PARTNERS MANAGEMENT LLC - HDSN201913G Passive Investment

| OMB APPROVAL | || |OMB NUMBER: | UNITED STATES |EXPIRES: | SECURITIES AND EXCHANGE COMMISSION | February 11, 2020 | Washington, D.

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