SAIF Partners: Now is your last chance to vote in Sinovac

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The special shareholders’ meeting for Sinovac is only a few days away. No matter how many shares you own, your vote matters

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SAIF Partners Urge Shareholders to Vot Gold Agent card”for“Its director candidate ends years of chaos, restores credibility and unlocks long-term value for all SINOVAC shareholders

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New York – SAIF Partners IV LP, (“Saif Partners,” “We” or “We”), the largest single investor of Sinovac Biotech Ltd. (“Sinovac” or “Company”), which beneficially owns approximately 15% of the company’s public stake, today urges to vote immediately “ for” The election of SAIF Partners’ ten highly qualified director candidates uses the company’s board of directors (“Board”) Gold Agent card. NINOVAC’s special shareholders’ meeting (“Special Meeting”), scheduled for Tuesday, July 8 at 8:00 pm Atlantic Standard Time (Wednesday, July 9, China CST) – Only a few days away, Time runs out of change in your vote.

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SAIF partners firmly believe that Sinovac’s current board of directors – most members are not formally elected by shareholders or approved by the Privy Council – does not act in the interests of all shareholders, and in fact, they only start doing so when public pressure is made. Furthermore, we believe that the current board lacks integrity, industry experience, management expertise and respect for the laws necessary to fulfill its lofty commitment to shareholders. Therefore, we believe that the current board cannot address the company’s most pressing issues, including numerous lawsuits ending and ending a six-year suspension of Sinovac’s public stock trading in the public market.

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But, most importantly, we are highly skeptical of the current board’s ability to follow its plans, and for several reasons, a significant dividend to shareholders is issued.

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. These include the failure of the current board to actively participate in management, its lack of reasonable financial reasoning because of its proposed dividend figures that are unwilling to hire a new independent auditor as it has driven the public accounting firm that Sinovac had previously resigned in April (their recent years of bad behavior and illegal actions by its members), including former securities violations, including former Chiang Li. These issues include, we believe that the current board of directors has developed a large-scale dividend distribution plan just to win the support of shareholders and retain its position even if it lacks the ability to follow its established promises.

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Ultimately, we believe there is a urgent need to make meaningful changes on the NINOVAC board to restore the company’s credibility to investors and regulators and to unlock the huge long-term value embedded in Sinovac by all shareholders. If elected, our nominees will work closely with management to deliver the long-term dividends that shareholders deserve and to establish a long-term business strategy to maximize the company’s value to all shareholders.

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Now you have the opportunity to elect a board of directors, which will act in the best interest all Zhongxi Nova shareholders

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vote Gold Today’s Agent Card “for” Proposal 1 and Proposal 2 delete Sinovac’s current board of directors and elect high-quality director candidates for SAIF partners

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access

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Voting with a unique control number located in your Gold Agent card.

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If you received Gold Through the email proxy card, click the link in your email to vote

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If you haven’t received Gold Agent card or if you lose it Gold Agent card, check your spam folder or contact your broker to ask for your control number.

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If you have already voted with your company’s white proxy card, you can still change your vote by using your vote Gold Agent card.

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About SAIF Partners

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SAIF Partners is a leading Asian private equity firm with a cumulative asset management of over $4 billion. SAIF Partners is an active leading investor who works closely with portfolio companies to develop their business organically through acquisitions, seeking collaborative collaboration, enhancing shareholder value by promoting good corporate governance and best management practices.

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Additional information and where to find it

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For the SAIF partner nominated ten directors on the SINOVAC board, such communication may be considered as solicitation of materials. In connection with such tenders, SAIF partners mailed authoritative agents and agent cards to shareholders of Sinovac for a special meeting related to the election of the director as Sinovac’s board of directors. The definitive proxy statement mailed by SAIF Partners is also filed as Exhibit 1 to its Schedule 13D/A filed on or about June 16, 2025. SHAREHOLDERS ARE URGED TO READ THE PROXY STATEMENT (INCLUDING ANY AMENDMENTS OR SUPPLEMENTS THERETO) AND ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC IN CONNECTION WITH SINOVAC’S SPECIAL MEETING, INCLUDING ANY DOCUMENT INCORPORATED BY REFERENCE THEREIN, CAREFULLY IF AND WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE DIRECTOR NOMINEES and special meetings and related matters. Shareholders of NINOVAC may receive free of charge a confirmed version of the proxy statement, any amendments or supplements provided, and any other relevant documents mailed by SAIF partners, involving a special meeting on Proxyvoting.com/sva/documents.

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