X0206 3/A 2018-08-13 2018-08-13 0 0001614067 Aridis Pharmaceuticals, Inc. ARDS 0001187308 RUFFOLO ROBERT R C/O ARIDIS PHARMACEUTICALS, INC. 5491 OPTICAL CT. SAN JOSE CA 95138 1 0 0 0 Stock Options 13.16 2026-10-20 Common Stock 7791 D The Stock Options vest in equal installments over 36 months, beginning on May 26, 2016. The original form 3 stated that vesting began on April 15, 2016. /s/ Robert Ruffolo 2019-08-29