Company: DVAX
Filing Date: 2025-05-19
Form Type: DFAN14A
Source: 0001193125-25-122435
Chunk: 0

Company: DYNAVAX TECHNOLOGIES CORP
Filing Date: 2025-05-19
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”), posted the following supplemental investor presentation to its campaign website at www.RefocusDVAX.com (the “Website”), related to Dynavax Technologies Corporation, a
Delaware corporation (the “Company”). From time to time, Deep Track and the other Participants may refer stockholders of the Company to such materials on the Website.

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Legal Disclaimer This presentation and any of the information contained herein (this is for discussion and general informational purposes only. This Presentation does not have regard for the specific investment objective, financial situation, suitability, or the particular need of any specific person who may receive this Presentation, and should not be taken as advice on the merits of any investment decision. This Presentation is not an offer to sell or the solicitation of an offer to buy interests in any fund, account or investment vehicle managed by Deep Track Capital,