X0508 4 2026-01-15 0 0001029142 DYNAVAX TECHNOLOGIES CORP DVAX 0001573072 Novack David F C/O DYNAVAX TECHNOLOGIES 2100 POWELL STREET, SUITE 720 EMERYVILLE CA 94608 0 1 0 0 President & COO 0 Common Stock 2026-01-15 4 M 0 20000 6.805 A 83344 D Common Stock 2026-01-15 4 M 0 94000 10.47 A 177344 D Common Stock 2026-01-15 4 S 0 114000 15.64 D 63344 D Stock Option (Right to Buy) 6.805 2026-01-15 4 M 0 20000 D 2026-12-15 Common Stock 20000 146528 D Stock Option (Right to Buy) 10.47 2026-01-15 4 M 0 85655 D 2026-02-21 Common Stock 85655 0 D Stock Option (Right to Buy) 10.47 2026-01-15 4 M 0 8345 D 2026-02-21 Common Stock 8345 0 D The sales reported on this Form 4 were effected pursuant to a 10b5-1 trading plan adopted on December 6, 2024. This transaction was executed in multiple trades at prices ranging from $15.585 to $15.665; the price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request to the SEC staff, Dynavax, or a security holder of Dynavax. Fully vested. Not applicable. David F. Novack, by /s/ Trevor Dutcher, Attorney-in-Fact 2026-01-20