SINOVAC Board Issues Letter to Shareholders to Set the Record Straight on the Hostile Actions and False Claims by Vivo Capital

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BEIJING — Sinovac Biotech Ltd. (NASDAQ: SVA) (“SINOVAC” or the “Company”), a leading provider of biopharmaceutical products in China, today announced that its board of directors (the “Board”) issued a public letter to shareholders in response to hostile actions and false claims by Vivo Capital and certain other parties (the “Vivo group”) against the legitimate and lawful actions of the Board.

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Dear Shareholders,

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We are writing to set the record straight in response to the Vivo group’s recent press releases, lawsuits and other actions against SINOVAC and the Board, particularly those related to the Board’s decision to declare a cash dividend of US$55.00 per common share to SINOVAC shareholders. The Vivo group is now attempting to block the special dividend payments to you via lawsuits and by sending threatening letters and messages to the Company’s stock transfer agent and board members. It is particularly concerning that the Vivo group is trying to prevent all SINOVAC common shareholders (who have received nothing over the past seven years) from receiving the special dividend even though the Vivo group have themselves already received over US$800 million in cash dividends from 2021-2024 from a majority owned subsidiary of SINOVAC. The driving motivation behind the Vivo group’s hostile actions has been to “double-dip” and receive even more dividends by claiming to be shareholders of SINOVAC, a claim that goes against court rulings¹.

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Events leading up to this moment and precipitated by the Vivo group have followed a lengthy and complex chronology, which are summarized in the Addendum to this letter.

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As you know, our shares have been halted from trading on NASDAQ since February 22, 2019. Despite the trading halt, the Company continued to operate and generate billions of dollars in profits without distributing any dividends to SINOVAC common shareholders. Also during this period, a number of unauthorized transactions and actions took place that primarily benefited the Vivo group, detailed below and in the Addendum. The Vivo group-controlled former board directly caused the NASDAQ trading halt, trapping your investment in our shares during the Covid-19 pandemic and ensuing years. The Board considers the special cash dividend to be an initial, corrective step in returning an appropriate share of distributions to the Company’s common shareholders, to address the inequities of the past, from which the Vivo group has benefited for many years at your expense.

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As you also know, on February 28, 2025, we announced that the rightfully elected Board was reconstituted and is actively governing the Company. This followed a judgment on January 16, 2025 (the “Judgment”) and an order issued on February 5, 2025 (the “Order”) by the Judicial Committee of the Privy Council (the “Privy Council”) – the final court of appeal for UK overseas territories and the Crown dependencies which was made up of five UK Supreme Court justices – which handed 1Globe Capital (“1Globe”), SINOVAC’s largest minority shareholder, a victory on all grounds, determining:

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In its Judgment, the Privy Council recognized that, notwithstanding the possibility that some of the Board members validly elected at the 2018 AGM may no longer be willing or able to serve in their director capacity seven years later, the new Board is the only lawful Board of the Company. Based on the Judgment and Order, the new Board was reconstituted, adding new members to replace those who resigned, in accordance with Antiguan law. The Board is now led by a group of directors who are recognized and respected industry leaders with diverse backgrounds in healthcare, science, and finance.

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Rather than accept the final, non-appealable Privy Council Judgment and Order, Vivo Capital has been blatantly interfering with the activation of the new Board and trying to undermine the Judgment and Order. The Vivo-controlled former Board similarly refused to accept their defeat at the 2018 AGM. Instead, they chose to launch lawsuits against a large number of SINOVAC shareholders who voted against them at the 2018 AGM. 1Globe used its own resources over the past seven years to defend against the poison pill (which unfairly targeted the shareholders who voted against the former Board) and ask the Antiguan court to settle the dispute regarding the Board election. Seven years later, Vivo Capital is at it again, trying to undermine the Privy Council’s Judgment and Order by launching lawsuits against the Board that put the Company back in litigation. The Board has offered to engage with them to discuss their concerns, but the Vivo group has thus far refused to engage.

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Vivo Capital has also erroneously claimed that the Company’s former auditor, Grant Thornton Zhitong Certified Public Accountants LLP (“Grant Thornton”), who resigned on April 15, 2025, did so because of the new Board precipitating a corporate governance crisis in 2025. This is untrue and conflates the invalid actions of the Vivo-group-controlled former board, with appropriate actions taken and proposed to be taken in 2025 by the new Board, which are in the best interests of SINOVAC’s rightful shareholders. Grant Thornton made it clear to the new Board that it had resigned because it could not rely on the former board’s representations about the Company’s financials in 2021, 2022, and 2023. In connection with its abrupt resignation, Grant Thornton also disclosed to the management and the Board that a material weakness and a significant deficiency in the Company’s internal control over financial reporting existed as of December 31, 2023, none of which were disclosed to the Company after its audit of the Company’s financial statements for the year ended December 31, 2023.

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These deficiencies occurred on the watch of the Vivo-controlled former board, who were excoriated in the Judgment, and are in no way related to the work of the new Board. We have recently added a qualified audit committee financial expert to our board to achieve NASDAQ compliance. Despite threats of interference from Vivo Capital, the new Board is focused on fulfilling its fiduciary duty with an unwavering commitment to correct the corporate governance issues of the past and formulate long-term growth strategies for the Company. The Board has responded to NASDAQ’s questions and requests for information, with a view toward the continued listing of the Company’s shares, the resumption of trading on NASDAQ, and the implementation of the announced special cash dividend plan. The Board expects to communicate further business updates in due course.