X0508 4/A 2025-05-08 2025-05-12 0001499422 RBB Bancorp RBB 0001179851 HOPKINS LYNN M 1055 WILSHIRE BLVD., SUITE 1220 LOS ANGELES CA 90017 1 EVP/CFO 0 Restricted Stock Units 0.0000 Common Stock 3756 3756 D Performance Stock Units 0.0000 Common Stock 8451 8451 D Restricted Stock Units 0.0000 Common Stock 7666 7666 D Restricted Stock Units 0 2025-05-08 4 A 0 7017 0 A Common Stock 7017 7017 D Performance Stock Units 0 2025-05-08 4 A 0 10524 0 A Common Stock 10524 10524 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 03/20/2024 date of grant. These performance stock units ("PSUs") will vest conditionally on the achievement of certain performance goals and an employment condition. The reported PSUs will vest at the expiration of a three-year period beginning on 03/20/2024 subject to the Reporting Person's satisfaction of the employment condition. These restricted stock units vest in five equal annual installments beginning one year after the 04/22/2024 date of grant. These restricted stock units vest in three equal annual installments beginning one year after the 05/08/2025 date of grant Performance Stock Units ("PSUs") to vest conditionally on the achievement of certain performance goals and an employment condition. The PSUs are awarded at a target level and have the opportunity to vest at 150% of such target level; The reported PSUs represent the maximum award that may be achieved and ultimately vest. The reported PSUs will vest at the expiration of a three-year period beginning on 05/08/2025 subject to the Reporting Person's satisfaction of the employment condition. 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 and PSUs granted to the Reporting Person on May 8, 2025. The Form 4 has also been amended to clarify that grants of RSUs and PSUs will be settled in common stock. /s/ Lynn Hopkins 2025-06-03