<SEC-DOCUMENT>0001104659-24-025750.txt : 20240221
<SEC-HEADER>0001104659-24-025750.hdr.sgml : 20240221
<ACCEPTANCE-DATETIME>20240221060913
ACCESSION NUMBER:		0001104659-24-025750
CONFORMED SUBMISSION TYPE:	8-A12B/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20240221
DATE AS OF CHANGE:		20240221

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SINOVAC BIOTECH LTD
		CENTRAL INDEX KEY:			0001084201
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			B9
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-A12B/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32371
		FILM NUMBER:		24656306

	BUSINESS ADDRESS:	
		STREET 1:		NO. 39 SHANGDI XI ROAD
		STREET 2:		HAIDIAN DISTRICT
		CITY:			BEIJING
		STATE:			F4
		ZIP:			100085
		BUSINESS PHONE:		86-10-82890088

	MAIL ADDRESS:	
		STREET 1:		NO. 39 SHANGDI XI ROAD
		STREET 2:		HAIDIAN DISTRICT
		CITY:			BEIJING
		STATE:			F4
		ZIP:			100085

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NET FORCE SYSTEMS INC
		DATE OF NAME CHANGE:	19991110
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-A12B/A
<SEQUENCE>1
<FILENAME>tm246823d1_8a12ba.htm
<DESCRIPTION>8-A12B/A
<TEXT>
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<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>UNITED STATES</B></P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SECURITIES AND EXCHANGE COMMISSION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; text-transform: uppercase"><B>W</B></FONT><B>ashington<FONT STYLE="text-transform: uppercase">,
D.C.&nbsp; 20549</FONT></B></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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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>FORM&nbsp;8-A</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Amendment No.&nbsp;5</B></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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<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: center"><B>FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>PURSUANT TO SECTION&nbsp;12(b)&nbsp;OR 12(g)&nbsp;OF
THE<BR>
SECURITIES EXCHANGE ACT OF 1934</B></P>

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

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SINOVAC BIOTECH LTD.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>(Exact name of registrant
as specified in its charter)</B></P>

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR>
    <TD STYLE="vertical-align: top; width: 49%; padding-right: 0.7pt; padding-left: 0.7pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Antigua,
    West Indies</B></FONT></TD>
    <TD STYLE="vertical-align: bottom; width: 2%; padding-right: 0.7pt; padding-left: 0.7pt; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 49%; padding-right: 0.7pt; padding-left: 0.7pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Not
    Applicable</B></FONT></TD></TR>
  <TR>
    <TD STYLE="vertical-align: top; padding-right: 0.7pt; padding-left: 0.7pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(State
    or other jurisdiction</B></FONT></TD>
    <TD STYLE="vertical-align: bottom; padding-right: 0.7pt; padding-left: 0.7pt; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: top; padding-right: 0.7pt; padding-left: 0.7pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(I.R.S.
    Employer Identification</B></FONT></TD></TR>
  <TR>
    <TD STYLE="vertical-align: top; padding-right: 0.7pt; padding-left: 0.7pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>of
    incorporation or organization)</B></FONT></TD>
    <TD STYLE="vertical-align: bottom; padding-right: 0.7pt; padding-left: 0.7pt; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: top; padding-right: 0.7pt; padding-left: 0.7pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Number)</B></FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR>
    <TD STYLE="vertical-align: top; width: 49%; padding-right: 0.7pt; padding-left: 0.7pt"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>No.&nbsp;39 Shangdi Xi Road,</B></P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Haidian District, Beijing 100085</B></P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>People&rsquo;s Republic of China</B></P></TD>
    <TD STYLE="vertical-align: bottom; width: 2%; padding-right: 0.7pt; padding-left: 0.7pt; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 49%; padding-right: 0.7pt; padding-left: 0.7pt"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Not Applicable</B></P></TD></TR>
  <TR>
    <TD STYLE="vertical-align: top; padding-right: 0.7pt; padding-left: 0.7pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(Address
    of Principal Executive Offices)</B></FONT></TD>
    <TD STYLE="vertical-align: bottom; padding-right: 0.7pt; padding-left: 0.7pt; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: top; padding-right: 0.7pt; padding-left: 0.7pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(Zip
    Code)</B></FONT></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: center">Securities to be registered pursuant to Section&nbsp;12(b)&nbsp;of
the Act:</P>

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR>
    <TD STYLE="border-bottom: Black 1pt solid; width: 49%; padding-right: 5.4pt; padding-left: 5.4pt"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Title of each class</B></P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>to be so registered</B></P></TD>
    <TD STYLE="padding-bottom: 1pt; width: 2%; padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; width: 49%; padding-right: 5.4pt; padding-left: 5.4pt"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Name of each exchange on which each</B></P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>class is to be registered</B></P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Preferred
    Share Purchase Rights</FONT></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
    NASDAQ Stock Market LLC</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: -0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">If this form relates to the registration of a class of securities
pursuant to Section&nbsp;12(b)&nbsp;of the Exchange Act and is effective pursuant to General Instruction A.(c), check the following box.
<FONT STYLE="font-family: Wingdings">&#120;</FONT></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"><FONT STYLE="font-family: Times New Roman, Times, Serif">If this form
relates to the registration of a class of securities pursuant to Section&nbsp;12(g)&nbsp;of the Exchange Act and is effective pursuant
to General Instruction A.(d), check the following box. </FONT><FONT STYLE="font-family: Wingdings">o</FONT></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">Securities Act registration statement file number to which this form
relates: Not applicable (if applicable)</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">Securities to be registered pursuant to Section&nbsp;12(g)&nbsp;of
the Act: None.</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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<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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<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">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>Item 1. Description of Registrant&rsquo;s
Securities to be Registered</B></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-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif">Reference
is hereby made to the Registration Statement on Form&nbsp;8-A filed by </FONT>Sinovac Biotech Ltd., an Antigua and Barbuda company (the
 &ldquo;Company&rdquo;), with the Securities and Exchange Commission (the &ldquo;SEC&rdquo;) on February&nbsp;22, 2019 (the &ldquo;Registration
Statement&rdquo;), relating to the Amended and Restated Rights Agreement, dated as of February&nbsp;22, 2019 (the &ldquo;Amended and
Restated Rights Agreement&rdquo;), as amended by the Amendment to Amended and Restated Rights Agreement dated as of February&nbsp;19,
2020 (the &ldquo;Amendment to Amended and Restated Rights Agreement&rdquo;), by the Second Amendment to Amended and Restated Rights Agreement
dated as of February&nbsp;21, 2021 (the &ldquo;Second Amendment to Amended and Restated Rights Agreement&rdquo;), by the Third Amendment
to Amended and Restated Rights Agreement dated as of February&nbsp;21, 2022 (the &ldquo;Third Amendment to Amended and Restated Rights
Agreement&rdquo;), and by the Fourth Amendment to Amended and Restated Rights Agreement dated as of February&nbsp;21, 2023 (the &ldquo;Fourth
Amendment to Amended and Restated Rights Agreement&rdquo;),between the Company and Pacific Stock Transfer Company, as Rights Agent. Such
Registration Statement is hereby incorporated herein by reference.</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-indent: 0.5in">On February&nbsp;21, 2024, the Company entered
into a fifth amendment to the Amended and Restated Rights Agreement (the &ldquo;Fifth Amendment&rdquo;), to extend the expiration date
of the rights contained therein from February&nbsp;22, 2024 to February&nbsp;22, 2025.</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-indent: 0.5in">The foregoing summary of the Fifth Amendment is
qualified in its entirety by reference to the full text of the Fifth Amendment, which is filed as Exhibit&nbsp;4.1 to the Company&rsquo;s
Form&nbsp;6-K filed with the SEC on February&nbsp;21, 2024, and is incorporated herein by reference. A copy of the Fourth Amendment to
Amended and Restated Rights Agreement and a summary of its material terms were filed on the SEC on Form&nbsp;6-K on February&nbsp;22,
2023 (incorporated herein by reference). A copy of the Third Amendment to Amended and Restated Rights Agreement and a summary of its
material terms were filed on the SEC on Form&nbsp;6-K on February&nbsp;22, 2022 (incorporated herein by reference). A copy of the Second
Amendment to Amended and Restated Rights Agreement and a summary of its material terms were filed on the SEC on Form&nbsp;6-K on February&nbsp;22,
2021 (incorporated herein by reference). A copy of the Amendment to Amended and Restated Rights Agreement and a summary of its material
terms were filed with the SEC on Form&nbsp;6-K on February&nbsp;21, 2020 (incorporated herein by reference). A copy of the Amended and
Restated Rights Agreement and a summary of its material terms were filed with the SEC on Form&nbsp;6-K on February&nbsp;22, 2019 (incorporated
herein by reference).</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"><B>Item 2. Exhibits</B></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">1.</TD><TD>Fifth Amendment to Amended and Restated Rights Agreement, dated as
                                            of February&nbsp;21, 2024, between Sinovac Biotech Ltd. and Pacific Stock Transfer Company,
                                            as Rights Agent (incorporated herein by reference to Exhibit&nbsp;4.1 of the Report on Form&nbsp;6-K
                                            dated February&nbsp;21, 2024 of Sinovac Biotech Ltd.)</TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">2.</TD><TD>Fourth Amendment to Amended and Restated Rights Agreement, dated as
                                            of February&nbsp;21, 2023, between Sinovac Biotech Ltd. and Pacific Stock Transfer Company,
                                            as Rights Agent (incorporated herein by reference to Exhibit&nbsp;4.1 of the Report on Form&nbsp;6-K
                                            dated February&nbsp;22, 2023 of Sinovac Biotech Ltd.)</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>

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<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">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">3.</TD><TD>Third Amendment to Amended and Restated Rights Agreement, dated as
                                            of February&nbsp;21, 2022, between Sinovac Biotech Ltd. and Pacific Stock Transfer Company,
                                            as Rights Agent (incorporated herein by reference to Exhibit&nbsp;4.1 of the Report on Form&nbsp;6-K
                                            dated February&nbsp;22, 2022 of Sinovac Biotech Ltd.)</TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Times New Roman, Times, Serif">4.</FONT></TD><TD>Second
                                            Amendment to Amended and Restated Rights Agreement, dated as of February&nbsp;21, 2021, between
                                            Sinovac Biotech Ltd. and Pacific Stock Transfer Company, as Rights Agent (incorporated herein
                                            by reference to Exhibit&nbsp;4.1 of the Report on Form&nbsp;6-K dated February&nbsp;22, 2021
                                            of Sinovac Biotech Ltd.)</TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Times New Roman, Times, Serif">5.</FONT></TD><TD>Amendment
                                            to Amended and Restated Rights Agreement, dated as of February&nbsp;19, 2020, between Sinovac
                                            Biotech Ltd. and Pacific Stock Transfer Company, as Rights Agent (incorporated herein by
                                            reference to Exhibit&nbsp;4.1 of the Report on Form&nbsp;6-K dated February&nbsp;21, 2020
                                            of Sinovac Biotech Ltd.)</TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Times New Roman, Times, Serif">6.</FONT></TD><TD>Amended
                                            and Restated Rights Agreement, dated as of February&nbsp;22, 2019, between Sinovac Biotech
                                            Ltd. and Pacific Stock Transfer Company, as Rights Agent, which includes the Form&nbsp;of
                                            Certificate of Designations of Series&nbsp;C Junior Participating Preferred Shares as Exhibit&nbsp;A,
                                            the Form&nbsp;of Right Certificate as Exhibit&nbsp;B and the Summary of Rights to Purchase
                                            Preferred Shares as Exhibit&nbsp;C (incorporated herein by reference to Exhibit&nbsp;99.6
                                            of the Report on Form&nbsp;6-K dated February&nbsp;22, 2019 of Sinovac Biotech Ltd.)</TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Times New Roman, Times, Serif">7.</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">Press
                                            Release of </FONT>Sinovac Biotech Ltd., dated February&nbsp;21, 2024 (incorporated herein
                                            by reference to Exhibit&nbsp;99.1 of the Report on Form&nbsp;6-K dated February&nbsp;21,
                                            2024 of Sinovac Biotech Ltd.)</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>

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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; text-align: center"><B>SIGNATURE</B></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">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Pursuant to the requirements of Section&nbsp;12
of the Securities Exchange Act of 1934, the registrant has duly caused this registration statement to be signed on its behalf by the
undersigned, thereto duly authorized.</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 0pt 192.25pt"></P>

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="3"><B>SINOVAC BIOTECH LTD.</B></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 3%">&nbsp;</TD>
    <TD STYLE="width: 5%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">By:</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; width: 42%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/
    </FONT><FONT STYLE="font-size: 10pt">Nan Wang</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Name:</FONT></TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nan Wang</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Title:</FONT></TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Chief Financial Officer</FONT></TD></TR>
  </TABLE>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 192.25pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Date: February&nbsp;21, 2024</P>

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

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