Company: DVAX
Filing Date: 2025-05-07
Form Type: DEFA14A
Source: 0000930413-25-001648
Chunk: 0

Company: DYNAVAX TECHNOLOGIES CORP
Filing Date: 2025-05-07
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
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 5:30pm ET on May 6, 2025.

Team,

With our Annual Meeting of Stockholders coming up on June 11, I know
many of you have started to receive a high volume of voting materials. I am very encouraged that our team members are eager to vote and
I wanted to share some instructions to help make the voting process as simple and efficient for you as possible:

#### Step 1 - Use the GOLD proxy card from Dynavax.

#### Step 2 – Cast your vote.

#### Step 3 – Submit your vote.

#### By mail

#### MacKenzie Partners, at 1 (800) 322-2885
If you hold Dynavax shares in more than one account (e.g., through our
Employee Stock Purchase Plan, in registered name or through a personal bank or brokerage account), you’ll receive separate GOLD proxy
cards or voting instruction forms for each account. To ensure all your shares are represented, please submit your vote for each account
in which you hold shares.