<SEC-DOCUMENT>0001193125-14-183582.txt : 20140506
<SEC-HEADER>0001193125-14-183582.hdr.sgml : 20140506
<ACCEPTANCE-DATETIME>20140506071033
ACCESSION NUMBER:		0001193125-14-183582
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		3
CONFORMED PERIOD OF REPORT:	20140501
ITEM INFORMATION:		Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers
ITEM INFORMATION:		Regulation FD Disclosure
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20140506
DATE AS OF CHANGE:		20140506

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			REPLIGEN CORP
		CENTRAL INDEX KEY:			0000730272
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				042729386
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-14656
		FILM NUMBER:		14815345

	BUSINESS ADDRESS:	
		STREET 1:		41 SEYON STREET
		STREET 2:		BUILDING 1, SUITE 100
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02453
		BUSINESS PHONE:		7814499560

	MAIL ADDRESS:	
		STREET 1:		41 SEYON STREET
		STREET 2:		BUILDING 1, SUITE 100
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02453
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>d723107d8k.htm
<DESCRIPTION>FORM 8-K
<TEXT>
<HTML><HEAD>
<TITLE>Form 8-K</TITLE>
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 <P STYLE="line-height:1.0pt;margin-top:0pt;margin-bottom:0pt;border-bottom:1px solid #000000">&nbsp;</P>
<P STYLE="line-height:3.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000">&nbsp;</P> <P STYLE="margin-top:4pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>UNITED STATES </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>SECURITIES AND EXCHANGE COMMISSION </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>Washington, D.C. 20549 </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>FORM 8-K
</B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center> <P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>CURRENT REPORT </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>PURSUANT
TO SECTION&nbsp;13 OR 15(d) </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>OF THE SECURITIES EXCHANGE ACT OF 1934 </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>Date of Report (Date of earliest event reported): May&nbsp;1, 2014 </B></P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center> <P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:24pt; font-family:Times New Roman" ALIGN="center"><B>REPLIGEN CORPORATION </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>(Exact name of registrant as specified in its charter) </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="top" ALIGN="center"><B>Delaware</B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B>0-14656</B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B>04-2729386</B></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:8pt">
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(State or other jurisdiction</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>of incorporation)</B></P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Commission</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>File Number)</B></P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(IRS Employer</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Identification No.)</B></P></TD></TR>
</TABLE> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="top" ALIGN="center"><B>41 Seyon Street, Bldg. 1, Suite 100, Waltham, MA</B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B>02453</B></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:8pt">
<TD VALIGN="top" ALIGN="center"><B>(Address of principal executive offices)</B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B>(Zip Code)</B></TD></TR>
</TABLE> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Registrant&#146;s telephone number, including area code (781)&nbsp;250-0111 </B></P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Former name or former address, if changed since last report.) </B></P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center> <P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the
following provisions (see General Instruction A.2. below): </P> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TR>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></TD>
<TD ALIGN="left" VALIGN="top">Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></TD>
<TD ALIGN="left" VALIGN="top">Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></TD>
<TD ALIGN="left" VALIGN="top">Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></TD>
<TD ALIGN="left" VALIGN="top">Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) </TD></TR></TABLE> <P STYLE="font-size:10pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<P STYLE="line-height:1.0pt;margin-top:0pt;margin-bottom:0pt;border-bottom:1px solid #000000">&nbsp;</P> <P STYLE="line-height:3.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000">&nbsp;</P>

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<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Item&nbsp;5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain
Officers; Compensatory Arrangements of Certain Officers. </B></P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">On May&nbsp;6, 2014, Repligen Corporation (the &#147;Company&#148; or
&#147;Repligen&#148;) announced Tony J. Hunt&#146;s appointment as Chief Operating Officer of the Company, effective May&nbsp;5, 2014 (the &#147;Start Date&#148;). </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Tony J. Hunt will be responsible for leading the Company&#146;s operating activities.&nbsp;Prior to joining the Company, Mr.&nbsp;Hunt was
most recently President, BioProduction at Life Technologies, a global life sciences company that was acquired by Thermo Fisher Scientific earlier this year.&nbsp;Mr. Hunt began his tenure at Life Technologies in 2008 as General Manager,
BioProduction Chromatography and Pharma Analytics. He was previously with Applied Biosystems for eight years, most recently as the Senior Director, Pharma Programs. Mr.&nbsp;Hunt began his career with Repligen where he worked in process development.
Mr.&nbsp;Hunt holds a B.S. in microbiology from University of Galway, Ireland, and an M.S. in biotechnology from University College Galway, Ireland, and a M.B.A. from Boston University School of Management. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">In connection with his employment, the Company entered into a letter agreement, dated April&nbsp;7, 2014 (the &#147;Employment
Agreement&#148;) which sets forth certain terms of Mr.&nbsp;Hunt&#146;s employment. There are no other arrangements or understandings between Mr.&nbsp;Hunt and any other persons pursuant to which he was selected as the Company&#146;s Chief Operating
Officer. Additionally, there are no transactions involving the Company and Mr.&nbsp;Hunt that the Company would be required to report pursuant to Item&nbsp;404(a) of Regulation S-K. </P>

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 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Pursuant to the terms of the Employment Agreement, Mr.&nbsp;Hunt will receive an annual base
salary of $330,000 and he will be eligible to receive an annual performance bonus under the Company&#146;s Executive Incentive Compensation Plan. The Company will target such bonus at up to 55% of Mr.&nbsp;Hunt&#146;s annual base salary; however,
the actual bonus percentage is discretionary and will be subject to the Board of Directors&#146; assessment of Mr.&nbsp;Hunt&#146;s performance as well as general business conditions at the Company. For 2014, the target bonus will be prorated at
36.7%. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Employment Agreement further provides that the Board of Directors will grant Mr.&nbsp;Hunt an incentive stock option to
purchase 50,000 shares of the Company&#146;s common stock (the &#147;Option Grant&#148;) under the Company&#146;s 2012 Stock Option and Incentive Plan (the &#147;Plan&#148;). The Employment Agreement also provides that the Board of Directors will
grant to Mr.&nbsp;Hunt a restricted stock unit award for 25,000 shares of the Company&#146;s common stock (the &#147;RSU Award&#148;) under the Plan. Twenty percent (20%)&nbsp;of each of the Option Grant and the RSU Award will vest and become
exercisable on the first, second, third, fourth and fifth anniversaries of the respective date of grant. In addition, Mr.&nbsp;Hunt will be eligible to receive additional incentive equity awards under the Company&#146;s executive incentive plans or
programs, with the target value of any such awards at an aggregate value of 65% and 75% of total target compensation. Mr.&nbsp;Hunt will be also be eligible to participate in all customary employee benefit plans or programs of the Company generally
available to the Company&#146;s full-time employees and/or executive officers. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Additionally, the Employment Agreement provides that
Mr.&nbsp;Hunt&#146;s employment with the Company is at will and may be terminated by either party at any time with or without notice and for any or no reason or cause. In the event Mr.&nbsp;Hunt&#146;s employment is terminated without cause,
Mr.&nbsp;Hunt will be entitled to receive severance pay equal to six months of his base salary in effect as of the termination date (less required deductions and withholdings) to be paid in the form of salary continuation on the Company&#146;s
standard payroll dates following the termination date, and fifty percent of his unvested stock options and restricted stock unit awards will vest immediately. Mr.&nbsp;Hunt will also receive a continuation of group health insurance coverage through
COBRA for a period of six months with the cost of such benefits to be shared in the same relative proportion by the Company and Mr.&nbsp;Hunt as in effect on the date of termination. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The foregoing description of the Employment Agreement is qualified in its entirety by reference to the Employment Agreement, which is filed
with this Current Report on Form 8-K as Exhibit 10.1 and is incorporated herein by reference. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">On May&nbsp;1, 2014, William J. Kelly, the
Company&#146;s Chief Accounting Officer, Secretary, Treasurer, principal accounting officer and principal financial officer, provided notice of his intention to resign from the Company, effective May&nbsp;9, 2014, in order to pursue other employment
opportunities. The Board of Directors of the Company appointed Walter C. Herlihy as the Company&#146;s Treasurer, principal accounting officer and principal financial officer and Mr.&nbsp;Hunt as the Company&#146;s Secretary, each effective upon the
date of Mr.&nbsp;Kelly&#146;s resignation from the Company. Mr.&nbsp;Herlihy will continue in his role as the Company&#146;s President and Chief Executive Officer in addition to his appointment as principal accounting officer and principal financial
officer. </P> <P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Item&nbsp;7.01. Regulation FD Disclosure. </B></P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">On May&nbsp;6, 2014, the Company issued a press announcing Mr.&nbsp;Hunt&#146;s appointment as Chief Operating Officer of the Company. The full
text of the press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. </P>

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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Item&nbsp;9.01. Financial Statements and Exhibits. </B></P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">(d) Exhibits </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="top">10.1</TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top">Letter Agreement, dated as of April&nbsp;7, 2014, by and between Repligen Corporation and Tony J. Hunt.</TD></TR>
<TR>
<TD HEIGHT="8"></TD>
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<TD VALIGN="top" NOWRAP>99.1</TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top">Press Release by Repligen Corporation, dated May&nbsp;6, 2014.</TD></TR>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">SIGNATURES </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by
the undersigned hereunto duly authorized. </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD WIDTH="4%"></TD>
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<TD WIDTH="45%"></TD></TR>


<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="top" COLSPAN="3">REPLIGEN CORPORATION</TD></TR>
<TR>
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
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<TD VALIGN="top">Date: May&nbsp;6, 2014</TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Walter C. Herlihy</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="top">Walter C. Herlihy</TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="top">President and Chief Executive Officer</TD></TR>
</TABLE>

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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>EXHIBIT INDEX </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="bottom" NOWRAP ALIGN="center"> <P STYLE="border-bottom:1.00pt solid #000000; width:11.80pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>No.</B></P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom" NOWRAP ALIGN="center"> <P STYLE="border-bottom:1.00pt solid #000000; width:25.30pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Exhibit</B></P></TD></TR>


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<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" NOWRAP>10.1</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Letter Agreement, dated as of April 7, 2014, by and between Repligen Corporation and Tony J. Hunt.</TD></TR>
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<TD HEIGHT="8"></TD>
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<TD VALIGN="top" NOWRAP>99.1</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Press Release by Repligen Corporation, dated May 6, 2014.</TD></TR>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right"><B>Exhibit 10.1 </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">April&nbsp;7, 2014 </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Anthony Hunt </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">85 Ford Rd </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Sudbury, MA 01776 </P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TR>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><B>Re:</B></TD>
<TD ALIGN="left" VALIGN="top"><B><U>Employment Agreement</U> </B></TD></TR></TABLE> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Dear Anthony: </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">This letter agreement (the &#147;Agreement&#148;) sets forth the terms of your employment with Repligen Corporation (the &#147;Company&#148;). This Agreement
supersedes any prior oral or written agreements or understandings related to the terms and conditions of your employment. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">1. <B>Position</B>. Your
position with the Company will be Chief Operating Officer and you will report directly to the Chief Executive Officer of the Company. This is a full-time position. While you render services to the Company, you will not engage in any other
employment, consulting or other business activity (whether full-time or part-time) that would create a conflict of interest with the Company. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">2. <B>Start
Date</B>. Your employment will begin on May&nbsp;5, 2014, unless another date is mutually agreed upon by you and the Company. For purposes of this Agreement, the actual first day of your employment shall be referred to as the &#147;Start Date.&#148;
</P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">3. <B>Salary</B>. The Company will pay you a salary at the rate of $330,000 per year (the &#147;Base Salary&#148;), payable in accordance with the
Company&#146;s standard payroll schedule and subject to applicable deductions and withholdings. Your salary will be subject to periodic review and adjustments at the Company&#146;s discretion. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">4. <B>Annual Bonus</B>. You will be eligible to receive an annual performance bonus under the Company&#146;s Executive Incentive Compensation Plan (or such
other applicable plan or program adopted by the Company) (the &#147;Bonus Plan&#148;). The Company will target the bonus at up to 55% of the Base Salary. For 2014, the target bonus will be prorated at 36.7% based upon your commencing employment on
the date referred to in paragraph 2. The actual bonus percentage is discretionary and will be subject to the Company&#146;s assessment of your performance, as well as business conditions at the Company. The bonus also will be subject to approval by
and adjustment at the discretion of the Company&#146;s board of directors or compensation committee and the terms of the Bonus Plan; provided that you shall be eligible for a prorated bonus for 2014 based upon the number of days in 2014 that you
work for the Company. The annual performance bonus, if any, shall be paid between January&nbsp;1<SUP STYLE="font-size:85%; vertical-align:top">st</SUP> and March&nbsp;15<SUP STYLE="font-size:85%; vertical-align:top">th</SUP> of the calendar year
following the applicable bonus year. The Company expects to review your job performance on an annual basis and will discuss with you the criteria which the Company will use to assess your performance for bonus purposes. The Company also may make
adjustments in the targeted amount of your annual performance bonus. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">5. <B>Stock Options and Incentive Grants</B>. The Company shall grant you an
incentive stock option to purchase 50,000 shares of the Company&#146;s Common Stock (the &#147;Option Grant&#148;) and a restricted stock unit award for 25,000 shares of the Company&#146;s Common Stock (the &#147;RSU Grant&#148; and collectively
with the Option Grant, the &#147;Equity Awards&#148;)) under the Company&#146;s 2012 Stock Option and Incentive Plan (the &#147;Plan&#148;). The foregoing options shall be issued at an exercise price equal to the fair market value of the Common
Stock as determined by the Company&#146;s board of directors on the date of grant (the &#147;Grant Date&#148;). Twenty percent (20%)&nbsp;of the Equity Awards shall vest and become exercisable on the first, second, third, fourth and fifth
anniversaries of the Grant Date, respectively, and the Equity Awards shall be further subject to the terms and conditions set forth in the Plan and the Company&#146;s associated Incentive Stock Option Agreement and Restricted Stock Unit Award
Agreements. In addition, you will be eligible to receive additional incentive equity awards under the Company&#146;s executive incentive plans or programs (such plan or program, an &#147;LTI Plan&#148;). The Company will target the value of any such
awards at an aggregate value of 65% and 75% of your total target compensation (presently estimated to be $332,375 and $383,625) in 2015 and </P>

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2016, respectively. Any actual awards under a LTI Plan (&#147;LTI Awards&#148;) are discretionary and will be subject to the Company&#146;s assessment of your performance, as well as business
conditions at the Company. Any LTI Awards will be subject to approval by and adjustment at the discretion of the Company&#146;s board of directors or compensation committee and the terms of any applicable LTI Plan. As with the Bonus, the Company
expects to review your job performance on an annual basis and will discuss with you the criteria which the Company will use to assess your performance for LTI Plan purposes. The Company also may make adjustments in the targeted amount of any LTI
Awards. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">6. <B>Benefits</B>. You will be eligible to participate in the employee benefits and insurance programs generally made available to the
Company&#146;s full-time employees which currently include health, life, short and long-term disability and a 401(k) plan. Details of these benefits programs, including mandatory employee contributions, and, if applicable, waiting periods, will be
made available to you when you start. You will also be eligible for up to 20 days of Paid Time Off per year (vacation /personal time) which shall accrue on a prorated basis, in accordance with the Company&#146;s vacation policy as in effect from
time to time. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">7. <B>At-will Employment, Severance</B>. Your employment is &#147;at will,&#148; meaning you or the Company may terminate it at any time
for any or no reason at which time you will be entitled to Accrued Obligations, defined as (1)&nbsp;the portion of your Base Salary that has accrued prior to any termination of your employment with the Company and has not yet been paid, (2)&nbsp;an
amount equal to the value of your accrued unused vacation days and (3)&nbsp;the amount of any expenses properly incurred by you on behalf of the Company prior to any such termination and not yet reimbursed and to no other compensation, <I>provided,
however</I>, in the event the Company terminates your employment without Cause (as defined below), in addition to the Accrued Obligations, the Company shall provide to you the following termination benefits (the &#147;Termination Benefits&#148;):
</P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(i) continuation of your base salary for a period of 6 months at the rate then in effect in accordance with the terms of the
Company&#146;s standard payroll schedule (solely for purposes of Section&nbsp;409A of the Internal Revenue Code of 1986, as amended, each payment is considered a separate payment (&#147;Salary Continuation Payments&#148;)); and </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ii) continuation of group health plan benefits for a period of 6 months to the extent authorized by and consistent with 29 U.S.C. &#167; 1161
et seq. (commonly known as &#147;COBRA&#148;), with the cost of the regular premium for such benefits shared in the same relative proportion by the Company and you as in effect on the date of termination. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(iii) full vesting of 50% of the then unvested Equity Awards, provided that you shall have with 90 days from such termination to exercise the
Option Grant. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Notwithstanding anything to the contrary in this Agreement, you shall not be entitled to any Termination Benefits unless you first
(i)&nbsp;enter into, do not revoke, and comply with the terms of a separation agreement in a form acceptable to the Company which shall include a release in favor of the Company and related persons and entities (the &#147;Release&#148;);
(ii)&nbsp;resign from any and all positions, including, without implication of limitation, as a director, trustee, and officer, that you then hold with the Company and any affiliate of the Company; and (iii)&nbsp;return all Company property and
comply with any instructions related to deleting and purging duplicates of such Company property. The Salary Continuation Payments shall commence within 60 days after the date of termination; <I>provided, however</I>, that if the 60-day period
begins in one calendar year and ends in a second calendar year, the Salary Continuation Payments shall begin to be paid in the second calendar year. All compensation and benefits payable to you, other than the Termination Benefits, shall terminate
on the date of termination of your employment. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">8. <B>Representation Regarding Other Obligations</B>. This offer is conditioned on your representation
that your former employer Life Technologies, Inc. and Thermo Fisher have assured you in writing that your employment by and rendering of services to Repligen Corporation as its COO shall not constitute a violation of any noncompete agreement between
you and those companies. If you have entered into any agreement that may restrict your activities on behalf of the Company, please provide Walter C. Herlihy with a copy of such agreement as soon as possible. You also represent that you have not
violated, and covenant that you will not violate, any other obligation to any previous employer or any other party, including that you have not used and will not use or disclose any trade secret or other proprietary right of any previous employer or
any other party. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">2 </P>


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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">9. <B>Definitions</B>. For purposes of this Agreement: </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&#147;Cause&#148; means (i)&nbsp;conduct constituting a material act of misconduct in connection with the performance of your duties, including, without
limitation, misappropriation of funds or property of the Company or any of its subsidiaries or affiliates other than the occasional, customary and de minimis use of Company property for personal purposes; (ii)&nbsp;the commission of any felony or a
misdemeanor involving moral turpitude, deceit, dishonesty or fraud; (iii)&nbsp;non-performance of your duties hereunder (other than by reason of your physical or mental illness, incapacity or disability) or repeated violations of your material
responsibilities and material duties as determined in good faith by the Company and which has continued for more than 30 days following written notice which notice shall specify in reasonable detail the performance problems and the actions required
to cure such performance problems ; (iv)&nbsp;a breach by you of any of the material provisions contained in any other written agreement by and between you and the Company that, if cureable, is not cured within thirty (30)&nbsp;days after the
Company notifies you in writing that it believes you have materially breached your obligations under this Agreement, which notice shall specify in reasonable detail such breach and the actions required to cure such breach ; (v)&nbsp;a material
violation of any of the Company&#146;s written employment policies as applied to other employees in the Company which has continued for more than 30 days following written notice which notice shall specify in reasonable detail such violation and the
actions required to cure such violation; or (vi)&nbsp;failure to cooperate with a bona fide internal investigation or an investigation by regulatory or law enforcement authorities, after being instructed by the Company to cooperate, or the willful
destruction or failure to preserve documents or other materials known to be relevant to such investigation or the inducement of others to fail to cooperate or to produce documents or other materials in connection with such investigation. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">10. <B>Taxes; Section&nbsp;409A</B>. All forms of compensation referred to in this Agreement are subject to reduction to reflect applicable withholding and
payroll taxes and other deductions required by law. You hereby acknowledge that the Company does not have a duty to design its compensation policies in a manner that minimizes your tax liabilities, and you will not make any claim against the Company
or its board of directors related to tax liabilities arising from your compensation. Anything in this Agreement to the contrary notwithstanding, if at the time of your separation from service within the meaning of Section&nbsp;409A of the Code, the
Company determines that you are a &#147;specified employee&#148; within the meaning of Section&nbsp;409A(a)(2)(B)(i) of the Code, then to the extent any payment or benefit that you become entitled to under this Agreement on account of your
separation from service would be considered deferred compensation subject to the 20 percent additional tax imposed pursuant to Section&nbsp;409A(a) of the Code as a result of the application of Section&nbsp;409A(a)(2)(B)(i) of the Code, such payment
shall not be payable and such benefit shall not be provided until the date that is the earlier of (A)&nbsp;six months and one day after your separation from service, or (B)&nbsp;your death. If any such delayed cash payment is otherwise payable on an
installment basis, the first payment shall include a catch-up payment covering amounts that would otherwise have been paid during the six-month period but for the application of this provision, and the balance of the installments shall be payable in
accordance with their original schedule. All in-kind benefits provided and expenses eligible for reimbursement under this Agreement shall be provided by the Company or incurred by you during the time periods set forth in this Agreement. All
reimbursements shall be paid as soon as administratively practicable, but in no event shall any reimbursement be paid after the last day of the taxable year following the taxable year in which the expense was incurred. The amount of in-kind benefits
provided or reimbursable expenses incurred in one taxable year shall not affect the in-kind benefits to be provided or the expenses eligible for reimbursement in any other taxable year. Such right to reimbursement or in-kind benefits is not subject
to liquidation or exchange for another benefit. To the extent that any payment or benefit described in this Agreement constitutes &#147;non-qualified deferred compensation&#148; under Section&nbsp;409A of the Code, and to the extent that such
payment or benefit is payable upon your termination of employment, then such payments or benefits shall be payable only upon your &#147;separation from service.&#148; The determination of whether and when a separation from service has occurred shall
be made in accordance with the presumptions set forth in Treasury Regulation Section&nbsp;1.409A-l(h). The Company and you intend that this Agreement will be administered in accordance with Section&nbsp;409A of the Code. To the extent that any
provision of this Agreement is ambiguous as to its compliance with Section&nbsp;409A of the Code, the provision shall be read in such a manner so that all payments hereunder comply with Section&nbsp;409A of the Code. The Company makes no
representation or warranty and shall have no liability to you or any other person if any provisions of this Agreement are determined to constitute deferred compensation subject to Section&nbsp;409A of the Code but do not satisfy an exemption from,
or the conditions of, such Section. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">11. <B>Interpretation, Amendment and Enforcement</B>. This Agreement and the Equity Documents, as modified herein,
constitute the complete agreement between you and the Company, contain all of the terms of your </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">3 </P>


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employment with the Company and supersede any prior agreements, representations or understandings (whether written, oral or implied) between you and the Company. The terms of this Agreement and
the resolution of any disputes as to the meaning, effect, performance or validity of this Agreement or arising out of, related to, or in any way connected with, this Agreement, your employment with the Company or any other relationship between you
and the Company (the &#147;Disputes&#148;) will be governed by Massachusetts law, excluding laws relating to conflicts or choice of law. You and the Company submit to the exclusive personal jurisdiction of the federal and state courts located in the
Commonwealth of Massachusetts in connection with any Dispute or any claim related to any Dispute. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">12. <B>Successors and Assigns</B>. This Agreement shall
be binding upon and inure to the benefit of both parties and their respective successors and assigns, including any corporation with which or into which the Company may be merged or which may succeed to its assets or business. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">13. <B>Other Terms</B>. Your employment with the Company will be on an &#147;at will&#148; basis. In other words, you or the Company may terminate your
employment for any reason and at any time, with or without cause. Although your job duties, title, compensation and benefits, as well as the Company&#146;s benefit plans and personnel policies and procedures, may change from time to time, the
&#147;at will&#148; nature of your employment may only be changed in an express written agreement signed by you and the Company. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">In addition, this offer
is subject to satisfactory background and reference checks. As with all employees, our offer to you is also contingent on your submission of satisfactory proof of your identity and your legal authorization to work in the United States. You also will
be required to sign, as a condition of your employment, the Company&#146;s standard form of non-disclosure agreement. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">We are excited about the prospect
of having you join the Company. We look forward to receiving a response from you within one week acknowledging, by signing below, that you have accepted this Agreement. </P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><DIV ALIGN="right">
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<TD VALIGN="top" COLSPAN="3">Very truly yours,</TD></TR>
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<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Walter C. Herlihy</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="top">Walter C. Herlihy</TD></TR>
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<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
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<TD VALIGN="top">Title:</TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="top">President and Chief Executive Officer</TD></TR>
</TABLE></DIV> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">I have read and accept this employment offer: </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>

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<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Anthony Hunt</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="top">Anthony Hunt</TD></TR>
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<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
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<TD VALIGN="top">Dated:</TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD></TR>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right"><B>Exhibit 99.1 </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="top"><B></B><B><I>Repli</I></B><B></B><I>Gen</I><B></B></TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top">Repligen&nbsp;Corporation</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">41 Seyon Street</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Building #1, Suite 100</P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Waltham,&nbsp;Massachusetts&nbsp;02453</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><FONT
STYLE="white-space:nowrap">Telephone:&nbsp;(781)&nbsp;250-0111</FONT></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman"><FONT STYLE="white-space:nowrap">Telefax:&nbsp;(781)&nbsp;250-0115</FONT></P></TD></TR>
</TABLE> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P> <P STYLE="line-height:1.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000">&nbsp;</P>
<P STYLE="margin-top:24pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Repligen Hires Former Life Technologies Executive Tony J. Hunt </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>as Chief Operating Officer </B></P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>WALTHAM, MA
&#150; May&nbsp;6, 2014</B> &#150; Repligen Corporation, a life sciences company focused on the manufacture and commercialization of bioprocessing products, today announced the appointment of Tony J. Hunt to the newly created position of Chief
Operating Officer. Mr.&nbsp;Hunt was most recently President, BioProduction at Life Technologies, a global life sciences company whose acquisition by Thermo Fisher Scientific was completed earlier this year. At Life Technologies, Mr.&nbsp;Hunt
played a key role in the development and growth of the company&#146;s bioprocessing business, where he focused on expanding the upstream Gibco<SUP STYLE="font-size:85%; vertical-align:top">&reg;</SUP> cell culture franchise and building the
downstream purification and analytics franchises. Mr.&nbsp;Hunt is an accomplished life sciences industry veteran who will oversee commercial and manufacturing operations for Repligen. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&#147;We welcome Tony to the Repligen management team, where his industry knowledge and understanding of bioproduction market drivers will help guide the
expansion of our commercial operations,&#148; said Walter C. Herlihy, Ph.D., President and Chief Executive Officer of Repligen. &#147;The expertise that Tony brings is particularly well aligned to Repligen&#146;s needs as we pursue multiple
opportunities to grow our bioprocessing business.&#148; </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Mr.&nbsp;Hunt joined Life Technologies in 2008, first as General Manager, BioProduction
Chromatography and Pharma Analytics before being named President, BioProduction in 2011. In this most recent role, where he led an organization of approximately 200 employees, his responsibilities included commercial operations and research and
development, as well as product management and marketing. Prior to this role, Mr.&nbsp;Hunt was with Applied Biosystems for eight years, most recently as Senior Director, Pharma Programs where he launched the pharma analytics business that in 2008
became a part of the bioproduction platform at Life Technologies. Mr.&nbsp;Hunt began his career with Repligen where he was involved in process development. He received a Bachelors of Science degree in microbiology from University College Galway,
Ireland, a Masters of Science degree in biotechnology from University College Galway, Ireland, and a Masters of Business Administration from Boston University School of Management. </P>
<P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>About Repligen Corporation </B></P> <P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Repligen Corporation
(NASDAQ:RGEN) is a life sciences company focused on the development, production and commercialization of high-value consumable products used in the process of </P>

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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><I>
Repligen Hires Former Life Technologies Executive Tony J. Hunt as Chief Operating Officer </I></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><I>Page 2 of 2 </I></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><I>May&nbsp;6, 2014 </I></P>
<p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">
manufacturing biological drugs. Our bioprocessing products are sold to major life sciences and biopharmaceutical companies worldwide. We are the leading manufacturer of Protein A affinity
ligands, a critical component of Protein A media that is used to separate and purify monoclonal antibody therapeutics. Our growth factor products are used to increase cell growth and product yield during the fermentation stage of biologic drug
manufacturing. In addition, we developed and market an innovative line of &#147;ready-to-use&#148; chromatography columns under our OPUS<SUP STYLE="font-size:85%; vertical-align:top">&reg;</SUP> brand (Open Platform User Specified) that we deliver
pre-packed to our biopharmaceutical customers with their choice of purification media. Repligen&#146;s corporate headquarters are in Waltham, MA (USA) and our manufacturing facilities are located in Waltham, MA and Lund, Sweden. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><I>This press release may contain forward-looking statements within the meaning of the federal securities laws. Investors are cautioned that statements in
this press release which are not strictly historical statements including, without limitation, statements identified by words like &#147;believe,&#148; &#147;expect,&#148; &#147;may,&#148; &#147;will,&#148; &#147;should,&#148; &#147;seek,&#148; or
&#147;could&#148; and similar expressions, constitute forward-looking statements. Such forward-looking statements, including, without limitation, express or implied statements regarding expansion of our commercial operation and opportunities to grow
our bioprocessing business, are subject to a number of risks and uncertainties that could cause actual results to differ materially from those anticipated, including risks detailed in our Annual Report on Form 10-K filed with the Securities and
Exchange Commission and the other reports that we periodically file with the Securities and Exchange Commission. These forward looking statements reflect management&#146;s current views and Repligen does not undertake to update any of these
forward-looking statements to reflect a change in its views or events or circumstances that occur after the date hereof except as required by law. </I></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Repligen Corporation </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Sondra Newman </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Director Investor Relations </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">(781) 419-1881 </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><U>snewman@repligen.com</U> </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Source: Repligen Corporation </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"># # # </P>
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