Company: DVAX
Filing Date: 2025-04-29
Form Type: DEFA14A
Source: 0000930413-25-001558
Chunk: 0

Company: DYNAVAX TECHNOLOGIES CORP
Filing Date: 2025-04-29
Form: DEFA14A
Chunk 0
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<div align='center'>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</div>

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

<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):

☒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
press release relating to a letter distributed by Dynavax Technologies Corporation (the “Company”) to its stockholders in
connection with the Company’s 2025 Annual Meeting of Stockholders. The press release was first used or made available on April 29,
2025.

FOR IMMEDIATE RELEASE

<div align='center'>Dynavax Highlights Superior Board Leadership Overseeing Long-Term Value Creation Strategy

Mails Letter to Stockholders Urging Stockholders to Vote “FOR”All Four Dynavax Director Nominees on the GOLDProxy Card</div>

EMERYVILLE, Calif., April 29, 2025 – Dynavax Technologies
Corporation (Nasdaq: DVAX) (“Dynavax” or the “Company”), a commercial-stage biopharmaceutical company developing
and commercializing innovative vaccines, today mailed a letter to its stockholders in connection with its 2025 Annual Meeting of
Stockholders (“Annual Meeting”) urging stockholders to vote the GOLD proxy card “FOR” all
four of Dynavax’s highly qualified directors standing for election – Brent MacGregor, Scott Myers, Lauren Silvernail
and Elaine Sun. The Annual Meeting will be held on June 11, 2025, and Dyn