X0609 4 2026-08-17 0 0001635282 Rimini Street, Inc. RMNI 0002149694 Costello Keith Conan false C/O 1700 S. PAVILION CENTER DRIVE SUITE 330 LAS VEGAS NV 89135 0 1 0 0 EVP & Chief Operating Officer 0 Common Stock 0 D Employee Stock Options (Right to Buy) 4.96 2026-08-17 4 A 0 150000 0 A 2036-08-17 Common Stock 150000 150000 D Restricted Stock Units 2026-08-17 4 A 0 150000 0 A Common Stock 150000 150000 D The Stock Options are subject to time-based vesting conditions and will vest in three (3) equal annual installments on August 17, 2027, August 17, 2028 and August 17, 2029, generally subject to the Reporting Person continuing to be a Service Provider (as such term is defined in the Issuer's 2013 Equity Incentive Plan) through the applicable vesting date. Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's Common Stock upon vesting. The Restricted Stock Units are subject to time-based vesting conditions and will vest in three (3) equal annual installments on August 17, 2027, August 17, 2028 and August 17, 2029, generally subject to the Reporting Person continuing to be a Service Provider (as such term is defined in the Issuer's 2013 Equity Incentive Plan) through the applicable vesting date. /s/ Celeste Rasmussen Peiffer, as Attorney-in-Fact 2026-08-17