Exhibit 99.1 FOR IMMEDIATE RELEASE Rimini Street Announces Fiscal Third Quarter 2025 Financial and Operating Results Third Quarter Financial Highlights Include: Rimini Street Announces Fiscal Third Quarter 2025 Financial and Operating Results page 2 Remaining Performance Obligations (RPO) of $611.2 million, up 6.4$63.9 million, up 6.7% from the prior year Active Clients of 3,155, up 1.9% from the prior year Select Third Quarter 2025 Financial Results LAS ...