Company: DVAX
Filing Date: 2025-05-06
Form Type: DFAN14A
Source: 0001193125-25-113502
Chunk: 0

Company: DYNAVAX TECHNOLOGIES CORP
Filing Date: 2025-05-06
Form: DFAN14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A (Rule 14A-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☐ Filed by a Party other than the Registrant ☒ Check the appropriate box:

| ☐ | Preliminary Proxy Statement |

| ☐ | Confidential, for Use of the Commission Only (as permitted by Rule 
 14a-6(e)(2))                                                       |

| ☐ | Definitive Proxy Statement |

| ☒ | Definitive Additional Materials |

| ☐ | Soliciting material Pursuant to §240.14a-12 |

Dynavax Technologies Corporation (Name of Registrant as Specified In Its Charter) DEEP TRACK BIOTECHNOLOGY MASTER FUND, LTD. DEEP TRACK CAPITAL, LP DAVID KROIN BRETT A. ERKMAN JEFFREY S. FARROW MICHAEL MULLETTE DONALD J. SANTEL (Name of Person(s) Filing Proxy Statement, if other than the Registrant) Payment of Filing Fee (Check the appropriate box):

| ☒ | No fee required. |

| ☐ | Fee paid previously with preliminary materials. |

| ☐ | Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11. |

Deep Track Capital, LP, a Delaware limited partnership (“Deep Track”), together with the other
participants named herein (collectively, the “Participants”), has filed a definitive proxy statement and accompanying WHITE proxy card with the Securities and Exchange Commission (the “SEC”) to be used to solicit proxies for the
election of its slate of director nominees at the 2025 annual meeting of stockholders of Dynavax Technologies Corporation (the “Company”).

Item
1: On May 6, 2025, Deep Track published the following Press Release, which was simultaneously posted to its campaign website at www.RefocusDVAX.com (the “Website”).

Deep Track Capital Releases Investor Presentation on Dynavax Technologies

Highlights Opportunity to Unlock Value With Enhanced Boardroom Objectivity

Details How Deep Track’s Independent Nominees Will Prioritize Shareholder-Aligned Capital Allocation Decisions and Help Set Value-Maximizing Strategy in the Boardroom

Visit www.RefocusDVAX.comto Download the Full Presentation

GREENWICH, Conn.