X0306 4 2021-05-12 0 0001614067 Aridis Pharmaceuticals, Inc. ARDS 0001749993 Truong Vu C/O ARIDIS PHARMACEUTICALS, INC. 983 UNIVERSITY AVE, BLDG. B LOS GATOS CA 95032 1 1 0 0 CEO and Director Stock Options 6.25 2021-05-12 4 A 0 53340 0 A 2031-05-12 Common Stock 53340 599390 D The stock options vest in equal installments over 12 months, beginning on May 12, 2021. /s/ Vu Truong 2021-05-13