X0407 4 2023-06-21 0 0001888012 HilleVax, Inc. HLVX 0001923461 Borkowski Astrid C/O HILLEVAX, INC., 75 STATE STREET, SUITE 100 - #9995 BOSTON MA 02109 0 1 0 0 Chief Medical Officer 0 Common Stock 2023-06-21 4 D 0 10000 16.11 D 210193 D Includes 434 shares acquired under the HilleVax, Inc. employee stock purchase plan on May 15, 2022, and 326 shares acquired (previously incorrectly reported as 341 shares acquired) under the HilleVax, Inc. employee stock purchase plan on November 15, 2022. /s/ Paul Bavier, Attorney-in-Fact for Astrid Borkowski 2023-06-23