Your Vote is Important

How to Vote

Your vote is critical to SINOVAC's future.

We urge you to keep SINOVAC's Board in place and vote on the WHITE proxy card "AGAINST" Proposal 1 to remove the current Board and "AGAINST" Proposal 2 to appoint the Reconstituted Imposter Former Board Slate. Your vote is critical to ensuring that SINOVAC remains on the path to stability, growth and value creation for all shareholders.

DISCARD any items you received asking you to vote for the Reconstituted Imposter Former Board Slate. If you have already voted for the Reconstituted Imposter Former Board Slate, you can subsequently revoke it by using the WHITE proxy card or WHITE voting instruction form to vote. Only your latest-dated vote will count!

Online

  1. Search your inbox for your proxy materials
  2. Open the email with your instructions on how to vote
  3. Tap the ‘Vote Now’ button to continue

or

  1. Locate your control number on your WHITE proxy card
  2. Visit www.proxyvote.com
  3. Follow the instructions to vote your shares

Phone

  1. Open the voting materials you received by mail
  2. Locate your unique control number on the insert
  3. Call the phone number listed on the insert
  4. Follow the prompts to cast your vote
Image depicting voting materials sent by mail illustrating how to find your control number

*This proxy card is illustrative and may differ from the materials you receive

If you do not have your proxy card or control number, please contact your broker to acquire it. If you're having trouble contacting your broker or identifying your control number, please contact Georgeson at (844) 568-1506 in the U.S., +1 (646) 543-1968 outside the U.S., or +86 186 1835 8924 for China and Hong Kong SAR

Questions on how to vote?
Let us help!

Contact our proxy solicitor Georgeson LLC

(844) 568-1506 in the U.S.
+1(646) 543-1968 outside the U.S.
+86 186 1835 8924 for China and Hong Kong SAR
[email protected]

Or

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For shareholders based in China and Hong Kong SAR, please refer to the below contact information and operating hours:

Georgeson China is reachable during regular hours on July 4th.

Standard Hours

Monday-Friday 9:00AM-6:00PM Beijing Time
Phone Number: +86 186 1835 8924

Operating hours for Georgeson U.S.:

Holiday Hours

Thursday, July 3rd – Open 9:00 AM-5:00 PM ET
Friday, July 4th – Full day closed

Standard Hours (Resuming Saturday, July 5th):

Monday-Friday 9:00 AM-11:00 PM ET
Saturday: 12:00 PM 6:00 PM ET

Live Webcast

SINOVAC’s Special Meeting of Shareholders

Tuesday, July 8, 2025, at 8:00 pm Atlantic Standard Time
Wednesday, July 9, 2025, at 8:00 am China Standard Time

To attend the virtual meeting, you must preregister by 8:00 pm Atlantic Standard Time on July 7, 2025.

Questions?

Contact our proxy solicitor Georgeson LLC

[email protected]