Exhibit 99.1 FOR IMMEDIATE RELEASE Rimini Street Announces Fiscal First Quarter 2025 Financial and Operating Results First Quarter Financial Highlights Include: Gross margin of 61.0% compared to 59.8% in the prior year Net Income of $3.4 million compared to$1.3 million in the prior year Billings of $79.4 million, up 7.2$15.3 million compared to $10.7 million in the prior year LAS VEGAS, May 1, 2025 – Rimini Street, Inc. (Nasdaq: RMNI), a global provider of end-to-end ent ...