X0306 4 2022-08-15 0001499422 RBB Bancorp RBB 0001711562 Liu Vincent 1055 WILSHIRE BLVD SUITE 1200 LOS ANGELES CA 90017 1 EVP Common Stock, No Par Value 2022-08-15 4 S 0 2553 22.95 D 14000 D Common Stock, No Par Value 2022-08-15 4 S 0 2000 23.15 D 12000 D Common Stock, No Par Value 2022-08-16 4 S 0 2000 23.35 D 10000 D Restricted Stock Units 0.0000 Restricted Stock Units 2301 2301 D These restricted stock units vest in three equal annual installments beginning one year after the 01/19/2022 date of grant. There will be no expiration date once restricted stock units vest. Vincent Liu sold a total of 4,553 shares on 8/15/2022 and another 2,000 shares on 8/16/2022. /s/ Vincent Liu 2022-08-16