<SEC-DOCUMENT>0001144204-16-135387.txt : 20161118
<SEC-HEADER>0001144204-16-135387.hdr.sgml : 20161118
<ACCEPTANCE-DATETIME>20161118162106
ACCESSION NUMBER:		0001144204-16-135387
CONFORMED SUBMISSION TYPE:	SC 13D/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20161118
DATE AS OF CHANGE:		20161118

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			HUDSON TECHNOLOGIES INC /NY
		CENTRAL INDEX KEY:			0000925528
		STANDARD INDUSTRIAL CLASSIFICATION:	WHOLESALE-MACHINERY, EQUIPMENT & SUPPLIES [5080]
		IRS NUMBER:				133641539
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-48635
		FILM NUMBER:		162008015

	BUSINESS ADDRESS:	
		STREET 1:		PO BOX 1541
		STREET 2:		ONE BLUE HILL PLAZA, 14TH FLOOR
		CITY:			PEARL RIVER
		STATE:			NY
		ZIP:			10965
		BUSINESS PHONE:		8457356000

	MAIL ADDRESS:	
		STREET 1:		PO BOX 1541
		STREET 2:		ONE BLUE HILL PLAZA, 14TH FLOOR
		CITY:			PEARL RIVER
		STATE:			NY
		ZIP:			10965

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	REFRIGERANT RECLAMATION INDUSTRIES INC
		DATE OF NAME CHANGE:	19940617

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MANDRACCHIA STEPHEN P
		CENTRAL INDEX KEY:			0001010541

	FILING VALUES:
		FORM TYPE:		SC 13D/A

	MAIL ADDRESS:	
		STREET 1:		25 TORNE VALLEY ROAD
		CITY:			HILLBURN
		STATE:			NY
		ZIP:			10931
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D/A
<SEQUENCE>1
<FILENAME>v453460_sc13da.htm
<DESCRIPTION>SC 13D/A
<TEXT>
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<P STYLE="margin-top: 0; text-align: center; margin-bottom: 0">&nbsp;</P>

<P STYLE="margin-top: 0; text-align: center; margin-bottom: 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>UNITED STATES</B> <B></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>SECURITIES AND EXCHANGE COMMISSION</B> <B></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Washington, D.C. 20549</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>&nbsp;</B></P>

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>SCHEDULE
13D</B></FONT><B>&nbsp;</B></P>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; text-align: center; margin-bottom: 0pt"><FONT STYLE="font-variant: small-caps"><B>Under
the Securities Exchange Act of 1934</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; text-align: center; margin-bottom: 0pt"><FONT STYLE="font-size: 10pt; font-variant: small-caps"><B>(Amendment
No. 5)</B></FONT><B><FONT STYLE="font-variant: small-caps"><SUP>*</SUP></FONT></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; text-align: center; margin-bottom: 0pt"><B>&nbsp;</B></P>

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><FONT STYLE="font-family: Times New Roman, Times, Serif">HUDSON TECHNOLOGIES, INC.</FONT></P>

<!-- Field: Rule-Page --><DIV ALIGN="LEFT" STYLE="margin-top: 0; margin-bottom: 0"><DIV STYLE="font-size: 1pt; border-top: Black 1pt solid; width: 100%">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><FONT STYLE="font-family: Times New Roman, Times, Serif"></FONT></P>

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><FONT STYLE="font: small-caps 10pt Times New Roman, Times, Serif">(Name of Issuer)</FONT></P>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; text-align: center; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; text-align: center; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><FONT STYLE="font-family: Times New Roman, Times, Serif">COMMON STOCK, $.01 PAR VALUE</FONT></P>

<!-- Field: Rule-Page --><DIV ALIGN="LEFT" STYLE="margin-top: 0; margin-bottom: 0"><DIV STYLE="font-size: 1pt; border-top: Black 1pt solid; width: 100%">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><FONT STYLE="font-family: Times New Roman, Times, Serif"></FONT></P>

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><FONT STYLE="font: small-caps 10pt Times New Roman, Times, Serif">(Title of Class of Securities)</FONT></P>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; text-align: center; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><FONT STYLE="font-family: Times New Roman, Times, Serif">444144-10-9</FONT></P>

<!-- Field: Rule-Page --><DIV ALIGN="LEFT" STYLE="margin-top: 0; margin-bottom: 0"><DIV STYLE="font-size: 1pt; border-top: Black 1pt solid; width: 100%">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><FONT STYLE="font-family: Times New Roman, Times, Serif"></FONT></P>

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><FONT STYLE="font: small-caps 10pt Times New Roman, Times, Serif">(CUSIP Number)</FONT></P>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 15.15pt 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 15.15pt 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">Stephen P. Mandracchia</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">Hudson Technologies, Inc.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">1 Blue Hill Plaza</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">PO Box 1541</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">Pearl River, New York 10965</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">(845) 735-6000</P>

<!-- Field: Rule-Page --><DIV ALIGN="LEFT" STYLE="margin-top: 0; margin-bottom: 0"><DIV STYLE="font-size: 1pt; border-top: Black 1pt solid; width: 100%">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><FONT STYLE="font-variant: small-caps">(Name, Address and Telephone Number of Person</FONT> <FONT STYLE="font-variant: small-caps"></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><FONT STYLE="font-variant: small-caps">Authorized to receive Notice and Communications)</FONT></P>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 15.15pt 0pt 0">&nbsp;</P>

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><FONT STYLE="font-family: Times New Roman, Times, Serif">August 9, 2016</FONT></P>

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<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><FONT STYLE="font-family: Times New Roman, Times, Serif"></FONT></P>

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><FONT STYLE="font: small-caps 10pt Times New Roman, Times, Serif">(Date of Event which Requires Filing of this Statement)</FONT></P>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0.7in 0pt 0"><FONT STYLE="font-variant: small-caps">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 15.15pt 0pt 0"><FONT STYLE="font-variant: small-caps">if the filing
person has previously filed a statement on schedule 13g to report the acquisition that is the subject of this schedule 13d, and
is filing this schedule because of &sect;&sect;</FONT>240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), <FONT STYLE="font-family: Times New Roman, Times, Serif; font-variant: small-caps">check
the following box </FONT><FONT STYLE="font-family: Wingdings; font-variant: small-caps">&#168;</FONT><FONT STYLE="font-family: Times New Roman, Times, Serif; font-variant: small-caps">.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0.7in 0pt 0"><FONT STYLE="font-variant: small-caps">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 15.15pt 0pt 0"><FONT STYLE="font-variant: small-caps"><B>Note:</B>
Schedules filed in paper format shall include a signed original and five copies of the Schedule, including all exhibits. See </FONT>RULE
13d-7 <FONT STYLE="font-variant: small-caps">for other parties to whom copies are to be sent.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0.7in 0pt 0"><FONT STYLE="font-variant: small-caps">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0.7in 0pt 0"><FONT STYLE="font-variant: small-caps"><SUP>*</SUP>
The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject
class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior
cover page.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0.7in 0pt 0"><FONT STYLE="font-variant: small-caps">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0.7in 0pt 0"><FONT STYLE="font-variant: small-caps">The information
required on the remainder of this cover page shall not be deemed to be &quot;filed&quot; for the purpose of Section 18 of the Securities
Exchange Act of 1934 (&quot;Act&quot;) or otherwise subject to the liabilities of that section of the Act but shall be subject
to all other provisions of the Act (however, see the Notes).</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 15.15pt 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 15.15pt 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 15.15pt 0pt 0">&nbsp;</P>


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    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 30%; padding-top: 0.9pt; padding-bottom: 2.7pt; font-size: 10pt; layout-grid-mode: line"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>CUSIP NO.</B> &nbsp;<U>444144-10-9</U></FONT></TD>
    <TD STYLE="width: 42%; padding-top: 0.9pt; padding-bottom: 2.7pt; font-size: 10pt; layout-grid-mode: line">&nbsp;</TD>
    <TD STYLE="width: 28%; padding-top: 0.9pt; padding-bottom: 2.7pt; font-size: 10pt; layout-grid-mode: line">&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="border-top: Black 1pt solid; border-bottom: Black 1pt solid; padding: 0; font-size: 10pt; layout-grid-mode: line; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">1.</FONT></TD>
    <TD COLSPAN="2" STYLE="border-top: Black 1pt solid; border-bottom: Black 1pt solid; padding: 0; text-indent: 0"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">NAMES
        OF REPORTING PERSONS.</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">Stephen
        P. Mandracchia</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid; padding: 0; font-size: 10pt; layout-grid-mode: line; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">2.</FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid; padding: 0; text-indent: 0"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">CHECK
        THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">(A)</FONT><FONT STYLE="font-family: Wingdings">&#168;</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">(B) </FONT><FONT STYLE="font-family: Wingdings">&#168;</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid; padding: 0; font-size: 10pt; layout-grid-mode: line; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">3.</FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid; padding: 0; background-color: #CCCCCC; text-indent: 0"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">SEC
        USE ONLY</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid; padding: 0; font-size: 10pt; layout-grid-mode: line; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">4.</FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid; padding: 0; text-indent: 0"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">SOURCE
        OF FUNDS (SEE INSTRUCTIONS)</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">Personal
        Funds (PF)</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid; padding: 0; font-size: 10pt; layout-grid-mode: line; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5.</FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid; padding: 0; text-indent: 0"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">CHECK
IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) </FONT><FONT STYLE="font-family: Wingdings">&#168;</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; font-size: 10pt; layout-grid-mode: line; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">6.</FONT></TD>
    <TD COLSPAN="2" STYLE="padding: 0; text-indent: 0"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">CITIZENSHIP
        OR PLACE OF ORGANIZATION</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">United
        States</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 14%; border-top: Black 1pt solid; padding: 0; text-align: center; vertical-align: bottom"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif">NUMBER
        OF</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif">SHARES</FONT></P></TD>
    <TD STYLE="width: 6%; border-top: Black 1pt solid; border-bottom: Black 1pt solid; padding: 0; font-size: 10pt; layout-grid-mode: line; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">7.</FONT></TD>
    <TD STYLE="width: 80%; border-top: Black 1pt solid; border-bottom: Black 1pt solid; padding: 0; text-indent: 0"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">SOLE
        VOTING POWER</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">1,628,961
        (of which 747,961 shares are held of record in the name of Reporting Person&rsquo;s spouse and 438,000 Shares are issuable
        upon exercise of options)</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-align: center"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif">BENEFICIALLY</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif">OWNED
        BY</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">EACH</FONT></P>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">REPORTING</FONT></P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"></P></TD>
    <TD STYLE="border-bottom: Black 1pt solid; padding: 0; font-size: 10pt; layout-grid-mode: line; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">8.</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; padding: 0; text-indent: 0"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">SHARED
        VOTING POWER</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">0</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">PERSON
    WITH</FONT><P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"></P></TD>
    <TD STYLE="border-bottom: Black 1pt solid; padding: 0; font-size: 10pt; layout-grid-mode: line; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">9.</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; padding: 0; text-indent: 0"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">SOLE
        DISPOSITIVE POWER</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">811,000
        (of which 438,000 shares are issuable upon exercise of options)</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid; padding: 0; font-size: 10pt; layout-grid-mode: line; text-align: center"></TD>
    <TD STYLE="border-bottom: Black 1pt solid; padding: 0; font-size: 10pt; layout-grid-mode: line; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; padding: 0; text-indent: 0"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">SHARED
        DISPOSITIVE POWER</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">747,961
        shares that are held of record in the name of Reporting Person&rsquo;s spouse</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid; padding: 0; font-size: 10pt; layout-grid-mode: line; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">11.</FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid; padding: 0; text-indent: 0"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">AGGREGATE
        AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">1,628,961
        (of which 747,961 shares are held of record in the name of Reporting Person&rsquo;s spouse and 438,000 Shares are issuable
        upon exercise of options)</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid; padding: 0; font-size: 10pt; layout-grid-mode: line; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">12.</FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid; padding: 0; text-indent: 0"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">CHECK
IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) </FONT><FONT STYLE="font-family: Wingdings">&#168;</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid; padding: 0; font-size: 10pt; layout-grid-mode: line; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">13.</FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid; padding: 0; text-indent: 0"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">PERCENT
        OF CLASS REPRESENTED BY AMOUNT IN ROW (11)</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">4.7%</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid; padding: 0; font-size: 10pt; layout-grid-mode: line; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">14.</FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid; padding: 0; text-indent: 0"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">TYPE
        OF REPORTING PERSON*</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">IN</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P></TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left">Item 1.</TD><TD STYLE="text-align: justify"><U>Security and Issuer</U></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">This Amendment No.
5 amends and supplements the Schedule 13D, as previously amended by Amendment Nos. 1, 2, 3 and 4 (the &ldquo;Schedule 13D&rdquo;),
of Stephen P. Mandracchia (the &ldquo;Reporting Person&rdquo;) with respect to his beneficial ownership of the common stock, par
value $.01 per share (&quot;Common Stock&quot;), of Hudson Technologies, Inc., a New York corporation (the &quot;Company&quot;),
whose principal executive offices are located at PO Box 1541, One Blue Hill Plaza, 14<SUP>th</SUP> Floor, Pearl River, New York
10965. Except as amended hereby, there has been no change in the information contained in the Schedule 13D.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left">Item 2.</TD><TD STYLE="text-align: justify"><U>Identity and Background</U></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Item 2 of the Statement is hereby amended
and supplemented as follows:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in; text-align: left">(a)</TD><TD STYLE="text-align: justify">This Statement is being filed by Stephen P. Mandracchia
(the &ldquo;Reporting Person&rdquo;).</TD>
</TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in; text-align: left">&nbsp;</TD><TD STYLE="text-align: justify">&nbsp;</TD>
</TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in; text-align: left">(b)</TD><TD STYLE="text-align: justify">The Reporting Person&rsquo;s business address is PO
Box 1541, One Blue Hill Plaza, Pearl River, New York 10965.</TD>
</TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in; text-align: left">&nbsp;</TD><TD STYLE="text-align: justify">&nbsp;</TD>
</TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in; text-align: left">(c)</TD><TD STYLE="text-align: justify">Reporting Person is presently employed by the Company
and serves as Vice President Legal, Regulatory and as Secretary of the Company.</TD>
</TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in; text-align: left">&nbsp;</TD><TD STYLE="text-align: justify">&nbsp;</TD>
</TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in; text-align: left">(d)</TD><TD STYLE="text-align: justify">The Reporting Person has not, during the last five
(5) years been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).</TD>
</TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in; text-align: left">&nbsp;</TD><TD STYLE="text-align: justify">&nbsp;</TD>
</TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in; text-align: left">(e)</TD><TD STYLE="text-align: justify">The Reporting Person has not, during the last five
(5) years, been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction that resulted in,
or resulted in the Reporting Person being subject to, a judgment, decree or final order enjoining future violations of, or prohibiting
or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.</TD>
</TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in; text-align: left">&nbsp;</TD><TD STYLE="text-align: justify">&nbsp;</TD>
</TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in; text-align: left">(f)</TD><TD STYLE="text-align: justify">The Reporting Person is a citizen of the United States
of America.</TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left">Item 3.</TD><TD STYLE="text-align: justify"><U>Source and Amount of Funds or Others Consideration</U>.</TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">The source and amount
of all funds used for the purchases of the shares reported in Item 5(c) below were the Reporting Person&rsquo;s personal funds.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left">Item 4.</TD><TD STYLE="text-align: justify"><U>Purpose of Transaction.</U></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">The purpose of the
dispositions of the shares of Common Stock reported in Item 5(c) below were to allow the Reporting Person to diversify his investments
and to establish a fund for payment of college tuition for his children, and to make gifts to certain family members. The shares
acquired as reported in Item 5(c) below were acquired by the Reporting Person for investment purposes.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left">Item 5.</TD><TD STYLE="text-align: justify"><U>Interest in Securities of the Issuer.</U></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">(a) According to the
Company there were issued and outstanding 34,057,964 shares of Common Stock as of November 17, 2016. The Reporting Person beneficially
owns 1,628,961 shares of the Company&rsquo;s Common Stock, comprising 4.7% of the 34,057,964 shares of the Company&rsquo;s Common
Stock issued and outstanding as of November 15, 2016, such ownership consisting of (i) 1,190,961 shares of Common Stock, of which
443,000 shares are held of record by the Reporting Person and 747,961 shares are held of record in the name of the Reporting Person&rsquo;s
spouse, and (ii) 438,000 shares that are issuable upon exercise of options held by the Reporting Person within sixty (60) days.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Reporting Person may be deemed to have (i) sole power to vote or direct the vote of 1,628,961 shares, consisting of 443,000 shares
held of record by the reporting person, 747,961 shares held of record in the name of the Reporting Person&rsquo;s spouse, and 438,000
shares that are issuable upon the exercise of options held by the Reporting Person within sixty (60) days; (ii) sole dispositive
power over 881,000 shares consisting of the 443,000 shares owned of record by the reporting person and the 438,000 shares that
are issuable upon the exercise of options held by the Reporting Person within sixty (60) days, and (iii) shared power to dispose
of the 747,961 shares held of record in the name of the Reporting Person&rsquo;s spouse.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">(c) Between June 19,
2013 and December 30, 2013, the Reporting Person and his spouse collectively made charitable donations of 50,000 shares of the
Company&rsquo;s Common Stock. On October 1, 2014, the Reporting Person was issued options by the Company to purchase 76,855 shares
of the Company&rsquo;s Common Stock at an exercise price $3.23 per share, and was issued options by the Company to purchase 28,145
shares of the Company&rsquo;s Common Stock at an exercise price of $3.55 per share. On December 19, 2014, the Reporting Person
exercised stock options to purchase 37,500 shares of the Company&rsquo;s Common Stock at exercise prices ranging from $0.87 to
$1.02 per share as more fully set forth on attached Schedule A. Between December 29, 2014 and March 12, 2015, the Reporting Person
and his spouse collectively gifted 58,750 shares of the Company&rsquo;s Common Stock to certain family members and made a charitable
donation of 5,000 shares of the Company&rsquo;s Common Stock. Between March 10, 2015 and May 16, 2015, the Reporting Person and
his spouse collectively sold a total of 142,284 shares of the Company&rsquo;s Common Stock in the open market, as more fully set
forth on the attached Schedule A. On June 11, 2015, the Reporting Person exercised stock options to purchase 91,900 shares of the
Company&rsquo;s Common Stock at exercise prices ranging from $0.83 to $2.15 per share as more fully set forth on attached Schedule
A. Between July 9, 2015 and June 24, 2016, the Reporting Person and his spouse collectively gifted 21,000 shares of the Company&rsquo;s
Common Stock to certain family members and made charitable donations of 25,000 shares of the Company&rsquo;s Common Stock. On July
18, 2016, the Reporting Person was issued options by the Company to purchase 121,510 shares of the Company&rsquo;s Common Stock
at an exercise price $3.51 per share, and was issued options by the Company to purchase 28,490 shares of the Company&rsquo;s Common
Stock at an exercise price of $3.86 per share. Between August 9, 2016 and August 10, 2016, the Reporting Person and his spouse
collectively sold a total of 300,000 shares of the Company&rsquo;s Common Stock in the open market, as more fully set forth on
the attached Schedule A. Between September 23, 2016 and September 26, 2016, the Reporting Person and his spouse collectively
gifted 15,700 shares of the Company&rsquo;s Common Stock to certain family members. There have been no other transactions in the
class of securities reported or that were effected during the past sixty days by the Reporting Person.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">(d) Except for the
Reporting Person&rsquo;s spouse, no person other than the Reporting Person has the right to receive dividends on, and any proceeds
from the disposition of, any Shares reported as owned by him in Item 5 above.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">(e) On August 10, 2016,
the reporting person ceased to be the owner of more than five percent (5%) of the Common Stock.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">SIGNATURE</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">After reasonable inquiry
and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; font: 10pt Times New Roman, Times, Serif; width: 100%">
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    <TD STYLE="width: 30%; border-bottom: Black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif">November 18,
    2016</FONT></TD>
    <TD STYLE="width: 70%"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif">Date</FONT></TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="border-bottom: Black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif">/s/ Stephen P. Mandracchia</FONT></TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif">Signature</FONT></TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">SCHEDULE A to SCHEDULE 13D, AMENDMENT No.
4</P>

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<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.5in; text-align: left">I.</TD><TD STYLE="text-align: justify">Sales of Hudson Technologies, Inc. $0.01 Common Stock</TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 60%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; margin-left: 0.5in">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 34%; padding: 0; layout-grid-mode: line; text-decoration: underline; text-indent: 0"><FONT STYLE="font-size: 10pt"><U>Date</U></FONT></TD>
    <TD STYLE="width: 33%; padding: 0; layout-grid-mode: line; text-decoration: underline; text-indent: 0"><FONT STYLE="font-size: 10pt"><U># Shares</U></FONT></TD>
    <TD STYLE="width: 33%; padding: 0; layout-grid-mode: line; text-decoration: underline; text-indent: 0"><FONT STYLE="font-size: 10pt"><U>$/Share </U></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">3/10/15</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">1,800</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">$4.52</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">3/12/15</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">60,457</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">$4.29*</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">3/13/15</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">14,927</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">$4.26*</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">5/6/15</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">65,100</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">$4.493*</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">8/9/16</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">271,742</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">$4.9*</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">8/10/16</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">28,258</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">$4.973*</FONT></TD></TR>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">*Weighted average price</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.5in; text-align: left">II</TD><TD STYLE="text-align: justify">Hudson Technologies, Inc. $0.01 Common Stock purchased
through exercise of Stock &#9;Options.</TD>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 80%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; margin-left: 0.5in">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 25%; padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt"><U>Date Exercised</U></FONT></TD>
    <TD STYLE="width: 25%; padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt"><U>Date Issued</U></FONT></TD>
    <TD STYLE="width: 25%; padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt"><U># Shares</U></FONT></TD>
    <TD STYLE="width: 25%; padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt"><U>Exercise Price&nbsp;&nbsp;</U></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">12/19/14</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">4/1/05</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">6,250</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">$0.87</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">12/19/14</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">1/3/05</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">31,250</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">$1.02</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">6/11/15</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">7/8/05</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">6,250</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">$0.83</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">6/11/15</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">9/30/05</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">6,250</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">$2.15</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">6/11/15</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">12/29/05</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">&nbsp;&nbsp;6,250</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">$1.76</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">6/11/15</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">12/29/05</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">45,000</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">$1.76</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">6/11/15</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">3/31/06</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">20.750</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">$1.40</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">6/11/15</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">10/10/06</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">7,400</FONT></TD>
    <TD STYLE="padding: 0; layout-grid-mode: line; text-indent: 0"><FONT STYLE="font-size: 10pt">$1.02</FONT></TD></TR>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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