UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549
FORM 6-K
REPORT OF FOREIGN PRIVATE ISSUER
PURSUANT TO RULE 13a-16 OR 15d-16 UNDER
THE SECURITIES EXCHANGE ACT OF 1934
For the month of July 2026
Commission File Number: 001-32371
SINOVAC BIOTECH LTD.
No. 39 Shangdi Xi Rd, Haidian District
Beijing 100085, People’s Republic of China
(Address of principal executive offices)
Indicate by check mark whether the registrant files or will file annual
reports under cover of Form 20-F or Form 40-F:
Form
20-F ☒
Form 40-F ☐
SIGNATURE
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, thereunto duly authorized.
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SINOVAC BIOTECH LTD. |
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By: |
/s/ Nan Wang |
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Name: |
Nan Wang |
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Title: |
Chief Financial Officer |
Date: July 15, 2026
Exhibit Index
| Exhibit 99.1 |
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Press Release |
Exhibit 99.1

SINOVAC Announces Extension of Deadline to Submit Payment Instructions
for Previously Declared Special Cash Dividend
2026-07-15
BEIJING -- Sinovac Biotech Ltd. (NASDAQ: SVA) (“SINOVAC”
or the “Company”), a leading provider of biopharmaceutical products in China, today announced that it has extended
the deadline for shareholders and nominee brokers to submit payment instructions relating to the Company’s previously declared special
cash dividend.
The Company previously announced a special cash dividend of US$55.00
per common share, payable to valid holders of the Company’s common shares as of the close of business on May 23, 2025 ET. The Company
previously informed shareholders that completed instruction materials were to be submitted prior to December 31, 2025 in order to facilitate
receipt of the dividend. The Company previously extended that submission deadline to June 30, 2026, and has now further extended that
submission deadline to December 31, 2026.
Shareholders and nominee brokers that have not yet submitted their
instruction materials are reminded to do so on or before December 31, 2026 in order to facilitate payment of the dividend. If you have
any questions regarding the process you need to undertake to receive the Dividend, please contact the Information Agent:
D.F. King & Co., Inc.
28 Liberty Street, 53rd Floor
New York, NY 10005
Attention: Sinovac Biotech Ltd. Special Dividend
Email: sva@dfking.com, with a subject line of Sinovac
Biotech Ltd, Special Dividend
Contact
Sinovac Biotech Ltd.
Helen Yang
Tel: +86-10-8279 9720
Email: ir@sinovac.com
About SINOVAC
Sinovac Biotech Ltd. (SINOVAC) is a China-based global biopharmaceutical
company, with a mission of “supply vaccines to eliminate human diseases”, the company specializes in the research, development,
manufacturing and commercialization of vaccines and related biological products that protect against human infectious diseases.
The company’s diversified portfolio includes vaccines for influenza,
viral hepatitis, varicella, Hand-Foot-Mouth disease (HFMD), poliomyelitis, pneumococcal disease, etc., of which 3 vaccines have been prequalified
by WHO, including inactivated hepatitis A vaccine Healive®, Sabin-strain inactivated polio vaccine (sIPV), and varicella vaccine.
SINOVAC has a leading edge in developing vaccines to combat infectious
disease outbreaks and was among the first to initiate R&D during major public health emergencies, including SARS, H5N1, H1N1, and
COVID-19. The company developed the world's first inactivated SARS vaccine (Phase I completed), China's first H5N1 influenza vaccine (Panflu®),
the world's first H1N1 influenza vaccine (Panflu.1®), and CoronaVac®, the most widely used inactivated COVID-19 vaccine globally.
Beyond its marketed portfolio, the company is advancing a robust pipeline
that includes combination vaccines, recombinant protein vaccines and next-generation platforms such as mRNA technologies and antibodies.
With a long-standing commitment to innovation and global health, SINOVAC
is expanding its global footprint by strengthening partnerships with research institutions, international organizations, and local partners.
Through broader market presence, technological cooperation, and localized production, the company aims to accelerate vaccine development
and supply, enhance regional access to high-quality products, and better address unmet medical needs while improving preparedness for
future pandemics.
For more information, please see the Company’s website at www.sinovac.com.