Company: DVAX
Filing Date: 2025-06-09
Form Type: DEFA14A
Source: 0001193125-25-137437
Chunk: 4

Company: DYNAVAX TECHNOLOGIES CORP
Filing Date: 2025-06-09
Form: DEFA14A
Chunk 4
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 and any periodic filings
made thereafter, as well as discussions of potential risks, uncertainties and other important factors in our other filings with the U.S. Securities and Exchange Commission. These forward-looking statements are made as of the date hereof, are
qualified in their entirety by this cautionary statement and we undertake no obligation to revise or update information herein to reflect events or circumstances in the future, even if new information becomes available. Information on Dynavax’s
website at www.dynavax.com is not incorporated by reference in our current periodic reports with the SEC.

Important Additional Information and Where to Find It

On April 17, 2025, the Company filed a definitive proxy statement on Schedule 14A (the “Proxy Statement”) and form of
accompanying GOLD proxy card with the U.S. Securities and Exchange Commission (the “SEC”) in connection with its 2025 Annual Meeting and its solicitation of proxies for the Company’s director nominees and for other matters to be voted
on. The Company may also file other relevant documents with the SEC regarding its solicitation of proxies for the 2025 Annual Meeting. This communication is not a substitute for any proxy statement or other document that the Company has filed or may
file with the SEC in connection with any solicitation by the Company. STOCKHOLDERS OF THE COMPANY ARE STRONGLY ENCOURAGED TO READ THE PROXY STATEMENT, ACCOMPANYING GOLD PROXY CARD AND OTHER RELEVANT DOCUMENTS FILED WITH, OR FURNISHED TO, THE SEC
CAREFULLY AND IN THEIR ENTIRETY AS THEY CONTAIN IMPORTANT INFORMATION. Stockholders may obtain a copy of the Proxy Statement, accompanying GOLD proxy card, any amendments or supplements to the Proxy Statement and any other relevant documents filed
by the Company with the SEC at no charge at the SEC’s website at www.sec.gov. Copies will also be available at no charge at the Company’s website at https://investors.dynavax.com/sec-filings.

Certain Information Regarding Participants

This communication is neither a solicitation of a proxy or consent nor a substitute for any proxy statement or other filings that may be made with the SEC. The
Company, its directors, its director nominees and certain of its executive officers and employees may be deemed to be participants in the solicitation of proxies for the 2025 Annual Meeting. Information regarding the names of such persons and their
respective direct or indirect interests in the Company, by securities holdings or otherwise, is available in the Proxy