BEIJING -- Sinovac Biotech Ltd. (Nasdaq: SVA) (“SINOVAC” or the “Company”), a leading provider of biopharmaceutical products in China, announced that it received a notification letter dated May 20, 2026 (the “Notification Letter”), from Nasdaq Listing Qualifications (“Nasdaq”) stating that as of May 8, 2026, the Company had regained compliance with the periodic filing and interim financial requirements in Nasdaq Listing Rules 5250(c)(1) (the “Periodic Filing Rule”) and 5250(c)(2), as required by the Panel’s decision dated January 21, 2026. As previously disclosed on January 22, 2026, under the Panel’s decision, SINOVAC was required to, on or before May 11, 2026, demonstrate compliance with such Nasdaq Listing Rules by completing filings of its annual report for the year ended December 31, 2024, on Form 20-F and an interim balance sheet and income statement as of the end of its second quarter of 2025 on Form 6-K. The Company timely completed such filings as required by the Panel’s decision.

The Notification Letter also stated that the Company will be subject to a mandatory panel monitor (the “Panel Monitor”) for a period of one year from the date of such letter. If, within that one-year monitoring period, the Nasdaq Listing Qualifications staff (the “Staff”) finds the Company again out of compliance with the Periodic Filing Rule that was the subject of the exception, the Staff will issue a delist determination letter and the Company will have an opportunity to request a new hearing with the initial Panel or a newly convened Panel if the initial Panel is unavailable. The Company will have the opportunity to respond and present to the Panel as provided by Nasdaq Listing Rule 5815(d)(4)(C).

Subsequently, the Company received a delist determination letter (the “Staff Determination”) from Nasdaq dated May 22, 2026, stating that because the Company has not timely filed its annual report on Form 20-F for the year ended December 31, 2025 (the “2025 Annual Report”), the Company no longer complies with the Periodic Filing Rule. Therefore, in accordance with the Panel Monitor, unless the Company timely requests a hearing before the Panel regarding the Staff Determination by May 29, 2026, the Company’s securities would be subject to suspension and delisting.

Accordingly, the Company has today requested a hearing before the Panel. Such hearing request automatically stays the suspension of the Company’s securities for a period of 22 calendar days from the date of the Staff Determination. The Company has also requested a further stay of any suspension action pending the completion of the hearing process.