X0508 4 2026-02-20 0001499422 RBB Bancorp RBB 0001711532 Yeh Jeffrey 1055 WILSHIRE BLVD SUITE 1200 LOS ANGELES CA 90017 1 EVP 0 Common Stock, No Par Value 2026-02-20 4 M 0 922 22.20 A 58564 D Common Stock, No Par Value 2026-02-20 4 F 0 380 22.20 D 58184 D Restricted Stock Units 22.20 2026-02-20 4 M 0 922 0 D 2026-02-20 Common Stock 1843 921 D Restricted Stock Units 0.0000 Common Stock 2652 2652 D Performance Stock Units 0.0000 Common Stock 5967 5967 D Restricted Stock Units 0.0000 Common Stock 4394 4394 D Performance Stock Units 0.0000 Common Stock 6589 6589 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 02/21/2024 date of grant. 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 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. Shares issued for vesting of 2/21/2024 RSU grant and shares disposed in settlement of tax withholding obligations for such RSU vesting. /s/ Jeffrey Yeh 2026-02-24