Exhibit 99.1 B. Riley Financial Reports Preliminary Unaudited Fourth Quarter and Full Year 2023 Results; Declares Quarterly Dividend of $0.50 per share LOS ANGELES, February 29, 2024 – B. Riley Financial, Inc. (NASDAQ: RILY) (“B. Riley” or the “Company”), a diversified financial services platform, today released preliminary unaudited financial results for the three and twelve-month periods ending December 31, 2023. These financial results are subject to completion of the ongoing audit of the Company’s annua ...