<SEC-DOCUMENT>0001193125-24-255987.txt : 20241112
<SEC-HEADER>0001193125-24-255987.hdr.sgml : 20241112
<ACCEPTANCE-DATETIME>20241112162250
ACCESSION NUMBER:		0001193125-24-255987
CONFORMED SUBMISSION TYPE:	NT 10-Q
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20240930
FILED AS OF DATE:		20241112
DATE AS OF CHANGE:		20241112
EFFECTIVENESS DATE:		20241112

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			REPLIGEN CORP
		CENTRAL INDEX KEY:			0000730272
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		ORGANIZATION NAME:           	03 Life Sciences
		IRS NUMBER:				042729386
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		NT 10-Q
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-14656
		FILM NUMBER:		241448629

	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>NT 10-Q
<SEQUENCE>1
<FILENAME>d850958dnt10q.htm
<DESCRIPTION>NT 10-Q
<TEXT>
<HTML><HEAD>
<TITLE>NT 10-Q</TITLE>
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<Center><DIV STYLE="width:8.5in" align="left">
 <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 <FONT
STYLE="white-space:nowrap">12b-25</FONT> </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>NOTIFICATION
OF LATE FILING </B></P> <P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right">SEC File Number <FONT STYLE="white-space:nowrap">000-14656</FONT> </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right">CUSIP Number 759916109 </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="top" ALIGN="right"><I>(Check One)&#8195;</I></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&#9744;&#8194;Form&nbsp;10-K&#8195; <FONT STYLE="white-space:nowrap">&#9744;&#8194;Form&nbsp;20-F&#8195;</FONT> <FONT
STYLE="white-space:nowrap">&#9744;&#8194;Form&nbsp;11-K&#8195;</FONT> <FONT STYLE="white-space:nowrap">&#9746;&#8194;Form&nbsp;10-Q</FONT></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">&#9744;&#8194;Form&nbsp;10-D&#8195; <FONT STYLE="white-space:nowrap">&#9744;&#8194;Form&nbsp;N-CEN&#8195;</FONT>
<FONT STYLE="white-space:nowrap">&#9744;&#8194;Form&nbsp;N-CSR</FONT></P></TD></TR>
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<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
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<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom">For Period Ended: September&nbsp;30, 2024</TD></TR>
<TR STYLE="font-size:1pt">
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<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom">&#9744;&#8194;Transition Report on Form <FONT STYLE="white-space:nowrap">10-K</FONT></TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="2"></TD>
<TD HEIGHT="2" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom">&#9744;&#8194;Transition Report on Form <FONT STYLE="white-space:nowrap">20-F</FONT></TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="2"></TD>
<TD HEIGHT="2" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom">&#9744;&#8194;Transition Report on Form <FONT STYLE="white-space:nowrap">11-K</FONT></TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="2"></TD>
<TD HEIGHT="2" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom">&#9744;&#8194;Transition Report on Form <FONT STYLE="white-space:nowrap">10-Q</FONT></TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="2"></TD>
<TD HEIGHT="2" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom">&#9744;&#8194;Transition Report on Form <FONT STYLE="white-space:nowrap">N-SAR</FONT></TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
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<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom">For the Transition Period Ended: &#8195;</TD></TR>
</TABLE> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TR STYLE="font-size:1pt">
<TD HEIGHT="4" STYLE="BORDER-LEFT:1px solid #000000; BORDER-TOP:1px solid #000000; BORDER-RIGHT:1px solid #000000; padding-left:8pt">&nbsp;</TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
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<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Nothing in this form shall be construed to imply that the Commission has verified any information contained herein.</B></P>
<P STYLE="font-size:3pt; margin-top:0pt; margin-bottom:1pt" align="left">&nbsp;</P></TD></TR>
</TABLE> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">If the notification relates to a portion of the filing checked above, identify the Item(s) to which the notification relates:
</P> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P> <P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&nbsp;&#8195;&nbsp;</P>
<P STYLE="line-height:1.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000">&nbsp;</P> <P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>PART I &#151; REGISTRANT
INFORMATION </B></P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:22pt; 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">Full Name of Registrant </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>N/A
</B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center">Former Name if Applicable </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>41 Seyon Street, Bldg.1, Suite 100 </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center">Address of Principal Executive Office (Street and Number) </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Waltham, MA 02453 </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center">City,
State and Zip Code </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>PART II&nbsp;&#151; RULES <FONT STYLE="white-space:nowrap">12b-25(b)</FONT> AND (c) </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">If the subject report could not be filed without unreasonable effort or expense and the registrant seeks relief pursuant to Rule <FONT
STYLE="white-space:nowrap">12b-25(b),</FONT> the following should be completed. (<I>Check box if appropriate</I>) </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="middle" ROWSPAN="3" STYLE="BORDER-RIGHT:1px solid #000000; padding-left:8pt">&#9746;&#8194;&#8201;</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">(a)</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">The reasons described in reasonable detail in Part III of this form could not be eliminated without unreasonable effort or expense;</P>
<P STYLE="font-size:6pt; margin-top:0pt; margin-bottom:1pt">&nbsp;</P></TD></TR>
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<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">(b)</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">The subject annual report, semi-annual report, transition report on Form <FONT STYLE="white-space:nowrap">10-K,</FONT> Form <FONT
STYLE="white-space:nowrap">20-F,</FONT> Form <FONT STYLE="white-space:nowrap">11-K,</FONT> Form <FONT STYLE="white-space:nowrap">N-CEN</FONT> or Form <FONT STYLE="white-space:nowrap">N-CSR,</FONT> or portion thereof, will be filed on or before the
fifteenth calendar day following the prescribed due date; or the subject quarterly report or transition report on Form <FONT STYLE="white-space:nowrap">10-Q</FONT> or subject distribution report on Form <FONT STYLE="white-space:nowrap">10-D,</FONT>
or portion thereof, will be filed on or before the fifth calendar day following the prescribed due date; and</P> <P STYLE="font-size:6pt; margin-top:0pt; margin-bottom:1pt">&nbsp;</P></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">(c)</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">The accountant&#146;s statement or other exhibit required by Rule <FONT STYLE="white-space:nowrap">12b-25(c)</FONT> has been attached if applicable.</TD></TR>
</TABLE> <P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>PART III &#151; NARRATIVE</B> </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">State below in reasonable detail the reasons why Forms <FONT STYLE="white-space:nowrap">10-K,</FONT>
<FONT STYLE="white-space:nowrap">20-F,</FONT> <FONT STYLE="white-space:nowrap">11-K,</FONT> <FONT STYLE="white-space:nowrap">10-Q,</FONT> <FONT STYLE="white-space:nowrap">10-D,</FONT> <FONT STYLE="white-space:nowrap">N-CEN,</FONT> <FONT
STYLE="white-space:nowrap">N-CSR,</FONT> or the transition report or portion thereof, could not be filed within the prescribed time period. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">REPLIGEN CORPORATION, (the &#147;Company&#148;), is unable, without unreasonable effort or expense, to file its Quarterly Report on Form <FONT
STYLE="white-space:nowrap">10-Q</FONT> for the quarter ended September&nbsp;30, 2024 (the &#147;Q3 Form <FONT STYLE="white-space:nowrap">10-Q&#148;)</FONT> with the Securities and Exchange Commission (the &#147;SEC&#148;) within the prescribed time
period for the reasons set forth below. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">As previously disclosed in the Company&#146;s Current Report on Form <FONT
STYLE="white-space:nowrap">8-K</FONT> filed with the SEC on September&nbsp;18, 2024, the Company is in the process of restating its financial statements and related disclosures for (i)&nbsp;the year ended December&nbsp;31, 2023 (the &#147;Annual
Report&#148;), (ii) each of the quarterly and <FONT STYLE="white-space:nowrap"><FONT STYLE="white-space:nowrap">year-to-date</FONT></FONT> periods for 2023 (the &#147;2023 Quarterly Reports&#148;), and (iii)&nbsp;the quarterly and <FONT
STYLE="white-space:nowrap"><FONT STYLE="white-space:nowrap">year-to-date</FONT></FONT> periods ended March&nbsp;31 and June&nbsp;30, 2024 (the &#147;2024 Quarterly Reports,&#148; together with the Annual Report and the 2023 Quarterly Reports, the
&#147;Prior Period Financial Statements&#148;). The restatement is expected to result in one or more material weaknesses in the Company&#146;s internal control over financial reporting during the Restatement Periods. A full assessment of the
Company&#146;s internal control over financial reporting will be included in the Annual Report. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">To prepare and file its Q3 Form <FONT
STYLE="white-space:nowrap">10-Q,</FONT> the Company must first complete amendments to each of the periodic reports related to the Prior Period Financial Statements. Although the Company has dedicated significant resources to completing the
restatement, the process is not yet complete due to the significant scope of the process to prepare the restated financial statements and related disclosures. As a result, the Company is not able to file its Q3 Form
<FONT STYLE="white-space:nowrap">10-Q</FONT> by the due date of November&nbsp;12, 2024 without unreasonable effort or expense, but is committed to its completion as soon as possible. </P>
<P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>PART IV &#151; OTHER INFORMATION </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="top">(1)</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">&#8195;</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" COLSPAN="9">Name and telephone number of person to contact in regard to this notification</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom" STYLE=" BORDER-BOTTOM:1px solid #000000">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center" STYLE="BORDER-BOTTOM:1px solid #000000"><B>Jason K. Garland, Chief Financial Officer</B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B>&#8195;</B></TD>
<TD VALIGN="bottom" STYLE=" BORDER-BOTTOM:1px solid #000000">&nbsp;&nbsp;</TD>
<TD VALIGN="top" ALIGN="center" STYLE="BORDER-BOTTOM:1px solid #000000"><B>(781)</B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B>&#8195;</B></TD>
<TD VALIGN="bottom" STYLE=" BORDER-BOTTOM:1px solid #000000">&nbsp;&nbsp;</TD>
<TD VALIGN="top" ALIGN="center" STYLE="BORDER-BOTTOM:1px solid #000000"><B><FONT STYLE="white-space:nowrap">250-0111</FONT></B></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:8pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center">(Name)</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top" ALIGN="center">(Area Code)</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top" ALIGN="center">(Telephone Number)</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD>
<TD HEIGHT="8" COLSPAN="10"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">(2)</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" COLSPAN="9">Have all other periodic reports required under Section&nbsp;13 or 15(d) of the Securities Exchange Act of 1934 or Section&nbsp;30 of the Investment Company Act of 1940 during the preceding 12 months or for such shorter
period that the registrant was required to file such report(s) been filed? If answer is no, identify report(s).&#8195;&#9746;&#8194;Yes&#8195;&#9744;&#8194;No</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="10"></TD></TR>
<TR STYLE="font-size:1px; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="bottom" STYLE=" BORDER-BOTTOM:1px solid #000000">&nbsp;</TD>
<TD VALIGN="bottom" COLSPAN="9" STYLE="BORDER-BOTTOM:1px solid #000000"><FONT STYLE="font-size:10pt">&#8195;</FONT></TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD>
<TD HEIGHT="8" COLSPAN="10"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">(3)</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" COLSPAN="9">Is it anticipated that any significant change in results of operations from the corresponding period for the last fiscal year will be reflected by the earnings statements to be included in the subject report or portion
thereof?&#8195;&#9746;&#8194;Yes&#8195;&#9744;&#8194;No</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD>
<TD HEIGHT="8" COLSPAN="10"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" COLSPAN="9">If so, attach an explanation of the anticipated change, both narratively and quantitatively, and, if appropriate, state the reasons why a reasonable estimate of the results cannot be made.</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD>
<TD HEIGHT="8" COLSPAN="10"></TD></TR>
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<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" COLSPAN="9">The Company&#146;s financial results for the quarter and nine months ended September&nbsp;30, 2024, compared to the financial results for the corresponding periods in the prior fiscal year are set forth in the
Company&#146;s press release dated November&nbsp;12, 2024, which is filed as an exhibit to the Company&#146;s Form <FONT STYLE="white-space:nowrap">8-K</FONT> furnished with the SEC on November&nbsp;12, 2024.</TD></TR>
</TABLE> <P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B><I>Forward-Looking Statements </I></B></P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">This Notification of Late Filing contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995
and other federal securities laws. Forward-looking statements include statements that are not historical facts and can be identified by terms such as &#147;anticipate,&#148; &#147;believe,&#148; &#147;could,&#148; &#147;estimate,&#148;
&#147;expect,&#148; &#147;intend,&#148; &#147;may,&#148; &#147;plan,&#148; &#147;potential,&#148; &#147;predict,&#148; &#147;project,&#148; &#147;seek,&#148; &#147;should,&#148; &#147;will,&#148; &#147;would&#148; or similar expressions and the
negatives of those terms. Any statements contained herein which do not describe historical facts, including, among others, statements regarding the expected impact of the restatement and change in accounting treatment, including on the
Company&#146;s overall business operations, previously reported cash and cash equivalent balances, and strategic outlook; statements regarding the Company&#146;s internal controls over financial reporting and ongoing internal reviews and
assessments; and statements regarding the Company&#146;s 2024 guidance are based on management&#146;s current expectations and beliefs and are forward-looking statements which involve risks and uncertainties that could cause actual results to differ
materially from those discussed in such forward-looking statements. Such risks and uncertainties include, among others, that the Company has underestimated the scope and impact of the restatement, risks and uncertainties around the effectiveness of
the Company&#146;s disclosure controls and procedures and the effectiveness of the Company&#146;s internal control over financial reporting, the risk that the Company&#146;s restated financial statements may take longer to complete than expected, as
well as those risks and uncertainties identified in the Company&#146;s filings with the U.S. Securities and Exchange Commission (the &#147;Commission&#148;), including the Annual Report, its Current Reports on
<FONT STYLE="white-space:nowrap">Form&nbsp;8-K,&nbsp;its</FONT> Quarterly Reports on <FONT STYLE="white-space:nowrap">Form&nbsp;10-Q,&nbsp;including</FONT> for the 2024 Quarterly Reports, and in any subsequent filings with the Commission, which are
available at the Commission&#146;s website at www.sec.gov. Any such risks and uncertainties could materially and adversely affect the Company&#146;s results of operations, its profitability and its cash flows, which would, in turn, have a
significant and adverse impact on the Company&#146;s stock price. The Company cautions you not to place undue reliance on any forward-looking statements, which speak only as of the date they are made. The Company disclaims any obligation to publicly
update or revise any such statements to reflect any change in expectations or in events, conditions or circumstances on which any such statements may be based, or that may affect the likelihood that actual results will differ from those set forth in
the forward-looking statements. As noted above, investors are cautioned that the Prior Period Financial Statements, and related investor communications, should no longer be relied upon; such communications include earnings releases, press releases,
shareholder communications, investor presentations and other communications describing relevant portions of the Prior Period Financial Statements. </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<P STYLE="line-height:1.5pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.50pt solid #000000">&nbsp;</P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>REPLIGEN CORPORATION </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center">(Name of Registrant as Specified in Charter) </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">has
caused this notification to be signed on its behalf by the undersigned thereunto duly authorized. </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="bottom">Date: November&nbsp;12, 2024</TD>
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<TD VALIGN="bottom">By:&#8201;</TD>
<TD VALIGN="bottom" STYLE=" BORDER-BOTTOM:1px solid #000000">&nbsp;</TD>
<TD VALIGN="bottom" STYLE="BORDER-BOTTOM:1px solid #000000">/s/ JASON K. GARLAND</TD></TR>
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<TD VALIGN="bottom"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Jason K. Garland</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Chief Financial Officer</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">(Principal financial officer)</P></TD></TR>
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