X0306 4 2022-04-26 0001499422 RBB Bancorp RBB 0001711496 Thian Yee Phong 1055 WILSHIRE BLVD SUITE 1200 LOS ANGELES CA 90017 1 Former President/CEO Common Stock, No Par Value 517302 D Restricted Stock Shares 2022-04-26 4 D 0 40000 0 D 0 D Option (right to buy) 11.1498 2023-01-01 Common Stock 242156 242156 D Option (right to buy) 11.1498 2023-05-15 Common Stock 10763 10763 D Option (right to buy) 13.2098 2024-05-21 Common Stock 10250 10250 D Option (right to buy) 17.0800 2025-05-20 Common Stock 10000 10000 D Option (right to buy) 18.2500 2026-05-17 Common Stock 10000 10000 D Restricted Stock Shares 0.0000 Restricted Stock Shares 40000 0 D Restricted Stock Units 0.0000 Restricted Stock Units 1000 0 D Restricted Stock Units 0.0000 Restricted Stock Units 14037 0 D Option (right to buy) 11.1498 2022-05-16 Common Stock 10763 10763 D There will be no expiration date once restricted stock shares vest. These options vest in three equal annual installments beginning one year after the 05/16/2012 date of grant. These options vest in three equal annual installments beginning one year after the 01/01/2013 date of grant. These options vest in three equal annual installments beginning one year after the 05/15/2013 date of grant. These options vest in three equal annual installments beginning one year after the 05/21/2014 date of grant. These options vest in three equal annual installments beginning one year after the 05/20/2015 date of grant. These options vest in three equal annual installments beginning one year after the 05/17/2016 date of grant. Represents forfeiture of restricted stock units that were originally granted on January 19, 2022. There will be no expiration date once restricted stock units vest. Represents forfeiture of 40,000 shares of restricted stock. Yee Phong Thian has forfeited the remaining restricted stock award of 40,000 shares and 15,037 restricted stock units. /s/ Yee Phong Thian 2022-04-26