Company: DVAX
Filing Date: 2025-05-19
Form Type: DEFA14A
Source: 0001193125-25-122482
Chunk: 3

Company: DYNAVAX TECHNOLOGIES CORP
Filing Date: 2025-05-19
Form: DEFA14A
Chunk 3
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 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 Statement, which was filed with the SEC on April 17, 2025, including in the sections captioned “Compensation Discussion and Analysis,” “Summary Compensation Table,” “Grants
of Plan Based Awards,” “Outstanding Equity Awards at Fiscal Year End,” “Pay Ratio Disclosure,” “Director Compensation,” “Certain Transactions,” “Security Ownership of Certain Beneficial Owners and
Management,” and “Supplemental Information Regarding Participants in the Solicitation.” To the extent that the Company’s directors and executive officers have acquired or disposed of securities holdings since the applicable
“as of” date disclosed in the Proxy Statement, such transactions have been or will be reflected on Statements of Changes in Ownership of Securities on Form 4 or Initial Statements of Beneficial Ownership of Securities on Form 3 filed with
the SEC. These documents are or will be available free of charge at the SEC’s website at www.sec.gov.