Company: DVAX
Filing Date: 2025-05-12
Form Type: DEFA14A
Source: 0000930413-25-001704
Chunk: 0

Company: DYNAVAX TECHNOLOGIES CORP
Filing Date: 2025-05-12
Form: DEFA14A
Chunk 0
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<div align='center'>UNITED STATES
SECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549

SCHEDULE 14A

PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE
SECURITIES EXCHANGE ACT OF 1934</div>

Filed by the Registrant x

Filed by a Party other than the Registrant o

Check the appropriate box:

| o | Preliminary Proxy Statement                                                     |
| o | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| o | Definitive Proxy Statement                                                      |
| x | Definitive Additional Materials                                                 |
| o | Soliciting Material Pursuant to §240.14a-12                                     |

<div align='center'>Dynavax Technologies Corporation(Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement if other than the Registrant)</div>

Payment of Filing Fee (Check the appropriate box):

| x | No fee required.                                                                                    |
| o | Fee paid previously with preliminary materials.                                                     |
| o | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rule 14a-6(i)(1) and 0-11. |

This Schedule 14A filing consists of the following
presentation distributed by Dynavax Technologies Corporation (the “Company”) to its stockholders in connection with the Company’s
2025 Annual Meeting of Stockholders. The presentation was first used or made available on May 12, 2025.

ibdroot \ projects \ IBD - NY \ dilates2022 \ 698484_1 \ Presentations \ 24. 2025.02.XX Fight Deck \ FINAL - to share with Cooley \ Dynavax Investor Presentation (May - 2025)_Print.pptx Dynavax’s Strategy Offers a Superior Path for D elivering Stockholder Value Investor Presentation: May 2025

ibdroot \ projects \ IBD - NY \ dilates2022 \ 698484_1 \ Presentations \ 24. 2025.02.XX Fight Deck \ FINAL - to share with Cooley \ Dynavax Investor Presentation (May - 2025)_Print.pptx Disclaimer © Copyright DYNAVAX 2025 2 | About Dynavax Dynavax is a commercial - stage biopharmaceutical company developing and commercializing innovative vaccines to help protect the w orld against infectious diseases. The