X0407 4 2023-05-26 0 0001029142 DYNAVAX TECHNOLOGIES CORP DVAX 0001805339 Sun Elaine D C/O DYNAVAX TECHNOLOGIES CORPORATION 2100 POWELL STREET, SUITE 720 EMERYVILLE CA 94608 1 0 0 0 0 Common Stock 2023-05-26 4 A 0 5357 0.00 A 18750 D Stock Option (Right to Buy) 11.20 2023-05-26 4 A 0 22500 0.00 A 2030-05-25 Common Stock 22500 22500 D These securities are restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of DVAX Common Stock. The RSU will fully vest one year from the date of grant, provided that Reporting Person continues to provide services to the Company through such vesting date. The release of RSU shares shall be mandatorily deferred six months and one day after the Reporting Person no longer provides services to the Company. The reporting person has reported prior awards of restricted stock units in Table II on Form 4. The total reported in Column 5 includes 5,357 newly awarded restricted stock units and 13,393 restricted stock units previously reported in Table II. This option grant fully vests and becomes exercisable one year from date of grant, provided that Reporting Person continues to provide services to the Company through such vesting date. Elaine Sun, by /s/ Trevor Dutcher, Attorney-in-Fact 2023-05-31