X0306 4 2022-04-27 0001499422 RBB Bancorp RBB 0001711919 Morris David Richard 1055 WILSHIRE BLVD SUITE 1200 LOS ANGELES CA 90017 1 Interim President/CEO Common Stock, No Par Value 2022-04-27 4 M 0 21525 11.1498 A 35301 D Stock Options 2022-04-27 4 M 0 21525 11.1498 D 21288 D Option (right to buy) 11.1498 2022-04-27 4 M 0 21525 11.1498 D 2023-01-01 Common Stock 33813 12288 D Option (right to buy) 20.5500 2030-01-22 Common Stock 9000 9000 D Restricted Stock Units 0.0000 Restricted Stock Units 2301 2301 D 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 01/22/2020 date of grant. 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. David Morris exercised 21,525 stock options on 4/27/2022. /s/ David Morris 2022-04-28