X0508 4/A 2025-05-08 2025-05-12 0001499422 RBB Bancorp RBB 0001711566 Huang Tsu Te 1055 WILSHIRE BLVD SUITE 1200 LOS ANGELES CA 90017 1 EVP 0 Restricted Stock Units 0.0000 Common Stock 659 659 D Restricted Stock Units 0.0000 Common Stock 1487 1487 D Restricted Stock Units 0 2025-05-08 4 A 0 2681 0 A Common Stock 2681 2681 D 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 01/18/2023 date of grant. 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. /s/ Tsu Te Huang 2025-06-03