X0508 4 2026-02-20 0001499422 RBB Bancorp RBB 0001843850 Chang Ashley 1055 WILSHIRE BLVD SUITE 1200 LOS ANGELES CA 90017 1 EVP 0 Common Stock, No Par Value 2026-02-20 4 M 0 667 22.20 A 3047 D Common Stock, No Par Value 2026-02-20 4 F 0 275 22.20 D 2772 D Option (right to buy) 20.5500 2030-01-22 Common Stock 6000 6000 D Option (right to buy) 17.7400 2031-01-21 Common Stock 30000 30000 D Restricted Stock Units 22.20 2026-02-20 4 M 0 667 0 D Common Stock 1334 667 D Restricted Stock Units 0.0000 Common Stock 3971 3971 D These options vest in three equal annual installments beginning one year after the 01/22/2020 date of grant. These options vest in three equal annual installments beginning one year after the 01/21/2021 date of grant. There will be no expiration date once restricted stock units vest. These restricted stock units vest in three equal annual installments beginning one year after the 02/21/2024 date of grant. These restricted stock units vest in four equal annual installments beginning one year after the 05/08/2025 date of grant. On May 12, 2025 due to an administrative error, the Reporting Person filed a Form 4 which inadvertently omitted information from the transactional columns in Table II and overstated the amount of RSUs granted to the Reporting Person on May 8, 2025. The Form 4 has also been amended to clarify that grants of RSUs will be settled in common stock. Shares issued for vesting of 2/21/2024 RSU grant and shares disposed in settlement of tax withholding obligations for such RSU vesting. /s/ Ashley Chang 2026-02-24