Company: DVAX
Filing Date: 2025-05-19
Form Type: DEFA14A
Source: 0001193125-25-122482
Chunk: 1

Company: DYNAVAX TECHNOLOGIES CORP
Filing Date: 2025-05-19
Form: DEFA14A
Chunk 1
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Elaine Sun — is essential to our Board. They bring expertise across the biotechnology and vaccine space for Dynavax
and have led multiple strategic transactions generating billions of dollars in value and maximizing stockholder value.

Do not let Deep Track derail Dynavax’s positive trajectory by replacing these four critical members of our Board with
inferior candidates. Deep Track is entirely focused on implementing its one-dimensional plan to strip-mine Dynavax that will jeopardize long-term stockholder value. We strongly urge you to vote “FOR” all four of Dynavax’s nominees on theGOLDproxy card today.

With our June 11 Annual Meeting fast
approaching, it is extremely important that you vote as soon as possible, no matter how many shares you own. Voting is quick and easy.

By mail: Complete,
sign, date and return the GOLD proxy card or GOLD voting instruction form in the postage-paid envelope provided.

By internet:
The GOLD proxy card or GOLD voting instruction form received includes a URL to submit votes electronically. Follow the instructions on the voting website and submit your vote by 8:59 p.m. PT on June 10.

By e-mail: If you received proxy materials via e-mail, the e-mail message included a link with instructions.

Remember – please disregard Deep Track’s proxy materials
and only vote on Dynavax’s GOLD proxy card.

If you have questions about how to vote your shares, please call the firm assisting us
with the solicitation of proxies, MacKenzie Partners, at 1-800-322-2885.

Forward-Looking Statements

This communication contains “forward-looking” statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and
Section 21E of the Securities Exchange Act of 1934, as amended, which are subject to a number of risks and uncertainties. All statements that are not historical facts are forward-looking statements. Forward-looking statements can generally be
identified by the use of words such as “expect,” “will,” “potential,” and similar expressions, or the negatives thereof, or they may use future dates. Forward-looking statements made in this document include statements
regarding expected contributions from our current directors, expectations regarding delivering value for our stockholders, our future growth, our business strategy and long-term performance. Actual results may differ materially from those set forth
in this communication due to the risks and uncertainties inherent in our business, including, the risk that circumstances surrounding or leading up to our 2025 Annual Meeting may