X0206 3 2025-05-08 0 0001499422 RBB Bancorp RBB 0002069008 Rizkalla Mina S. 1055 WILSHIRE BLVD SUITE 1200 LOS ANGELES CA 90017 1 EVP/Chief Risk Officer Common Stock, No Par Value 0 D Restricted Stock Units 0.0000 2025-05-08 Restricted Stock Units 5212 D Restricted Stock Units 0.0000 2025-05-08 Restricted Stock Units 2085 D These restricted stock units vest in three equal annual installments beginning one year after the 05/08/2025 date of grant. There will be no expiration date once restricted stock units vest. These restricted stock units vest in four equal annual installments beginning one year after the 05/08/2025 date of grant. Mina Rizkalla has no securities beneficially owned. Mr. Rizkalla was granted 5,212 restricted stock units that will vest in three equal annual installments from the date of the grant. He was also granted 2,085 restricted stock units that will vest in four equal annual installments from the date of the grant. /s/ Mina Rizkalla 2025-05-19