Company: DVAX
Filing Date: 2025-06-05
Form Type: DEFA14A
Source: 0001193125-25-135994
Chunk: 0

Company: DYNAVAX TECHNOLOGIES CORP
Filing Date: 2025-06-05
Form: DEFA14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A 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) (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 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 email distributed by Dynavax Technologies Corporation (the “Company”) to its employees in connection with the Company’s 2025 Annual Meeting of Stockholders. The email was first used or made available after 3:20pm ET on June 5, 2025. Subject: Important Reminder Ahead of June 11 Annual Meeting Team, Our Annual Meeting of Stockholders is less than one week away on June 11. For those of you who are Dynavax stockholders and have already voted – thank you! For those of you who haven’t yet voted, there is still time and we encourage you to do so as soon as possible. I have pasted some instructions below for your reference and if you have any questions, please contact our proxy solicitor, MacKenzie Partners, who can answer any questions you have at 1 (800) 322-2885. Over the last few days, three independent proxy advisory firms have issued reports and provided voting recommendations to institutional shareholders. We received full support from two firms (ISS and Egan-Jones), which is important recognition of our team, strategy and value we are delivering to our stakeholders, and the third firm (Glass Lewis) split its recommendation. As always, thank you all for