X0306 4/A 2022-01-19 2022-01-25 0001499422 RBB Bancorp RBB 0001711554 Lin Paul 660 S. FIGUEROA STREET SUITE 1888 LOS ANGELES CA 90017 1 Option (right to buy) 11.1498 2022-05-16 Common Stock 10763 0 D Option (right to buy) 11.1498 2023-05-15 Common Stock 10763 0 D Option (right to buy) 13.2098 2024-05-21 Common Stock 10250 0 D Option (right to buy) 17.0800 2025-05-20 Common Stock 10000 0 D Option (right to buy) 18.2500 2026-05-17 Common Stock 10000 0 D Restricted Stock Units 0.0000 Restricted Stock Units 1050 1050 D 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 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. These restricted stock units vest in two 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. Amending Paul Lin's vesting period of his granted 1,050 restricted stock units that will vest in two equal annual installments on 01/19/2023 and 01/19/2024. /s/ Paul Lin 2022-02-17