Exhibit 99.1 RBB Bancorp Reports First Quarter 2025 Earnings Los Angeles, CA, April 28, 2025 – RBB Bancorp (NASDAQ:RBB) and its subsidiaries, Royal Business Bank (the "Bank") and RBB Asset Management Company ("RAM"), collectively referred to herein as the "Company," announced financial results for the quarter ended March 31, 2025. First Quarter 2025 Highlights Net interest income was $26.2 million for the first quarter of 2025, compared to$26.0 million for the fourth quarter of 2024. The $186,000 increase ...