144 0001573072 XXXXXXXX LIVE 0001029142 DYNAVAX TECHNOLOGIES CORPORATION 001-34207 2100 Powell Street Suite 720 Emeryville CA 94608 (510) 848-5100 DAVID NOVACK Officer Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

30000 464700.00 117424968 12/24/2025 NASDAQ Common 12/24/2025 Stock Option Exercise Issuer N 30000 12/24/2025 Cash Y Sales that were executed on December 24, 2025 are being reported on this Form 144 filed on December 29, 2025 given December 24, 2025 and December 26, 2025 were treated as federal holidays for EDGAR filing purposes. 12/29/2025 12/06/2024 /s/ David F Novack