Company: DVAX
Filing Date: 2025-04-07
Form Type: PREC14A
Source: 0001193125-25-074629
Chunk: 4

Company: DYNAVAX TECHNOLOGIES CORP
Filing Date: 2025-04-07
Form: PREC14A
Chunk 4
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ES BY FOLLOWING THE INSTRUCTIONS ON THE ENCLOSED
WHITEPROXY CARD TODAY. PLEASE VOTE VIA THE INTERNET, BY TELEPHONE, OR MARK, SIGN, DATE AND RETURN THE ENCLOSED WHITEPROXY CARD BY MAIL, VOTING “FOR”THE ELECTION OF THE FOUR DEEP TRACK NOMINEES.

HOLDERS OF SHARES AS OF THE RECORD DATE ARE URGED TO SUBMIT A WHITEPROXY CARD EVEN IF YOUR SHARES OF COMMON STOCK WERE SOLD AFTER THE
RECORD DATE.

IF YOU HAVE ALREADY SENT A GOLD PROXY CARD FURNISHED BY THE COMPANY, YOU MAY REVOKE THAT PROXY AND VOTE ON EACH OF THE
PROPOSALS DESCRIBED IN THIS PROXY STATEMENT BY FOLLOWING THE INSTRUCTIONS ON THE ENCLOSED WHITE PROXY CARD TO VOTE VIA THE INTERNET OR BY TELEPHONE, OR BY MARKING, SIGNING, DATING AND RETURNING THE ENCLOSED WHITEPROXY CARD BY MAIL. THE
LATEST DATED PROXY IS THE ONLY ONE THAT WILL BE COUNTED. ANY PROXY MAY BE REVOKED AT ANY TIME PRIOR TO ITS EXERCISE AT THE 2025 ANNUAL MEETING BY DELIVERING A WRITTEN NOTICE OF REVOCATION OR A LATER DATED, VALIDLY EXECUTED PROXY FOR THE 2025 ANNUAL
MEETING OR BY VOTING IN PERSON AT THE 2025 ANNUAL MEETING.

Important Notice Regarding the Availability of Proxy Materials for the 2025 Annual Meeting

This Proxy Statement and our WHITE proxy card are available at[ link to come]

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IMPORTANT Your vote is important, no matter how many shares of Common Stock you own. We urge you to follow the instructions set forth on the enclosed WHITE proxy card to vote via the Internet or by telephone or to mark, sign, date, and return the enclosed WHITE proxy card by mail today to vote FOR the election of the four Deep Track Nominees and in accordance with the Deep Track Parties’ recommendations on the other proposals on the agenda for the 2025 Annual Meeting.

| • |     | If your shares of Common Stock are registered in your own name, please follow the instructions set forth on the                                                                             
 enclosed WHITE proxy card to vote via the Internet or by telephone, or mark, sign and date the enclosed WHITE proxy card and return it today by mail in the postage-paid envelope provided. |

| • |     | If your shares of