Investor Presentation

RS In Summary: Company Highlights Serviceable Available Market Opportunity Compelling Client Value Proposition Historically High Growth, Predictable Business Model Significant Cash Flow Generation Large & Growing Blue Chip Global Client Base Experienced Management Team • $14.8 billion SAM for Enterprise Software Support $14.7 billion SAM for Enterprise Software Managed Services and AMS for Salesforce • $4.2 billion SAM for Rimini: Protect, Connect and Consult • Support clients can save up to 90% in total maintenance costs with Rimini Street • No costly, unneeded upgrades or migrations; enables clients to control their own IT strategy and roadmap (Business-Driven Roadmap) 14% revenue CAGR 2018 thru 2022 • Backlog of $550 million as of September 30, 2023 Over 96% subscription and recurring revenue, 90%+ Revenue Retention Rate (1) Adjusted EBITDA (2) growth and low CapEx expected to drive growth in cash flow- Adjusted EBITDA was $50.6 million for the first half ended September 30, 2023 T Mobile ROSS DRESS FOR LESS* petco TOLL 3M TOYOTA Harper Collins • Proven management team with experience at leading companies including: ORACLE SAP PeopleSoft MOODY'S Hewlett Packard Enterprise EDS ANALYTICS an HP company Andersen Consulting KPMG 1. See Revenue Retention Rate definition on page 35. 2. Adjusted EBITDA is a non-GAAP measure, see reconciliation on page 34 for historical reconciliation to the closest GAAP measure, and further defined on page 34. Property of Rimini Street ©2023 | Proprietary and Confidential 30

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