X0407 4 2023-05-26 0 0001029142 DYNAVAX TECHNOLOGIES CORP DVAX 0001657434 Hack Andrew A. F. C/O BAIN CAPITAL LIFE SCIENCES INVESTORS LLC, 200 CLARENDON STREET BOSTON MA 02116 1 0 0 0 0 Common Stock 2023-05-26 4 A 0 5357 0.00 A 10714 D Common Stock 2915000 I See footnotes 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 RSUs in Table II of Form 4. The total reported in Column 5 includes 5,357 newly awarded RSUs and 5,357 RSUs 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. Represents shares of common stock held directly by Bain Capital Life Sciences Fund, L.P. ("BCLS") and BCIP Life Sciences Associates, LP ("BCIPLS" and, together with BCLS, the "Bain Capital Life Sciences Entities"). Bain Capital Life Sciences Investors, LLC ("BCLSI") is the ultimate general partner of BCLS and governs the investment strategy and decision-making process with respect to investments held by BCIPLS. Dr. Hack is a Partner of BCLSI. By virtue of the relationships described in this footnote, Dr. Hack may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Life Sciences Entities. Dr. Hack disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein. /s/ Andrew Hack 2023-05-31