DYNAVAX TECHNOLOGIES CORP — Director's Dealing 2025

Dec 29, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: DYNAVAX TECHNOLOGIES CORP (DVAX)
CIK: 0001029142
Period of Report: 2025-12-23

Reporting Person: Metzinger Joseph Anthony (VP, Chief Accounting Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-12-23	Common Stock	M	12727	—	Acquired	12727	Direct
2025-12-24	Common Stock	F	5598	$15.38	Disposed	7129	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-12-23	Restricted Stock Unit	$	M	12727	Disposed		Common Stock (12727)	Direct

Footnotes

F1: On December 23, 2025 (the "Effective Date"), in connection with the execution of an Agreement and Plan of Merger dated as of the Effective Date (the "Merger Agreement") by and among the Issuer, SANOFI, a French societe anonyme ("Parent"), and Samba Merger
Sub, Inc., a Delaware corporation and a wholly owned subsidiary of Parent, the Board of Directors of the Issuer approved acceleration of vesting of certain restricted stock units ("RSUs") previously granted to the Reporting Person, effective as of the Effective Date.

F2: Each RSU represents a contingent right to receive one share of the Issuer's common stock.

F3: Shares withheld by the Issuer to satisfy tax withholding requirements on vesting of restricted stock units.

F4: The RSUs were granted on May 12, 2025, and were originally scheduled to vest over three years, with 1/3 vesting on each anniversary of May 12, 2025.