Investor Presentation

RS LEGAL DISCLAIMER @ 2023 Rimini Street, Inc. All rights reserved. “Rimini Street" is a registered trademark of Rimini Street, Inc. in the United States and other countries, and Rimini Street, the Rimini Street logo, and combinations thereof, and other marks marked by TM are trademarks of Rimini Street, Inc. All other trademarks remain the property of their respective owners, and unless otherwise specified, Rimini Street claims no affiliation, endorsement, or association with any such trademark holder or other companies referenced herein. Investor Presentation This presentation is for informational purposes only and has been prepared to assist interested parties in making their own evaluation with respect to a proposed investment in Rimini Street. The information contained herein does not purport to be all-inclusive. Rimini Street assumes no obligation to update the information in this presentation. This presentation does not constitute an offer to sell or a solicitation of an offer to buy any securities, nor shall there be any sale, issuance or transfer of securities in any jurisdiction where, or to any person to whom, such offer, solicitation or sale may be unlawful. Forward-Looking Statements Certain statements included in this communication are not historical facts but are forward-looking statements for purposes of the safe harbor provisions under The Private Securities Litigation Reform Act of 1995. Forward- looking statements generally are accompanied by words such as "anticipate," "believe," "continue," "could," "currently," "estimate," "expect," "future," "intend," "may," "might," "outlook," "plan," "possible," "potential," "predict," "project," "seem," "seek," "should," "will," "would" or other similar words, phrases or expressions. These forward- looking statements include, but are not limited to, statements regarding our expectations of future events, future opportunities, global expansion and other growth initiatives and our investments in such initiatives. These statements are based on various assumptions and on the current expectations of management and are not predictions of actual performance, nor are these statements of historical facts. These statements are subject to a number of risks and uncertainties regarding Rimini Street's business, and actual results may differ materially. These risks and uncertainties include, but are not limited to, adverse developments in and costs associated with defending pending litigation or any new litigation, including the disposition of pending motions to appeal and any new claims; additional expenses to be incurred in order to comply with injunctions against certain of our business practices and the impact on future period revenue and costs; changes in the business environment in which Rimini Street operates, including the impact of any recessionary economic trends and changes in foreign exchange rates, as well as general financial, economic, regulatory and political conditions affecting the industry in which we operate and the industries in which our clients operate; the evolution of the enterprise software management and support landscape and our ability to attract and retain clients and further penetrate our client base; significant competition in the software support services industry; customer adoption of our expanded portfolio of products and services and products and services we expect to introduce; our ability to sustain or achieve revenue growth or profitability, manage our cost of revenue and accurately forecast revenue; estimates of our total addressable market and expectations of client savings relative to use of other providers; variability of timing in our sales cycle; risks relating to retention rates, including our ability to accurately predict retention rates; the loss of one or more members of our management team; our ability to attract and retain qualified employees and key personnel; challenges of managing growth profitably; our need and ability to raise additional equity or debt financing on favorable terms and our ability to generate cash flows from operations to help fund increased investment in our growth; the impact of environmental, social and governance (ESG) matters; risks associated with global operations; our ability to prevent unauthorized access to our information technology systems and other cybersecurity threats, protect the confidential information of our employees and clients and comply with privacy regulations; our ability to maintain an effective system of internal control over financial reporting; our ability to maintain, protect and enhance our brand and intellectual property; changes in laws and regulations, including changes in tax laws or unfavorable outcomes of tax positions we take, or a failure by us to establish adequate tax reserves; our credit facility's ongoing debt service obligations and financial and operational covenants on our business and related interest rate risk, including uncertainty from the transition to SOFR or other interest rate benchmarks; the sufficiency of our cash and cash equivalents to meet our liquidity requirements; the amount and timing of repurchases, if any, under our stock repurchase program and our ability to enhance stockholder value through such program; uncertainty as to the long-term value of Rimini Street's equity securities; catastrophic events that disrupt our business or that of our clients; and those discussed under the heading "Risk Factors" in Rimini Street's Quarterly Report on Form 10-Q filed on November 1, 2023, and as updated from time to time by Rimini Street's future Annual Reports on Form 10-K, Quarterly Reports on Form 10- Q, Current Reports on Form 8-K, and other filings by Rimini Street with the Securities and Exchange Commission. In addition, forward-looking statements provide Rimini Street's expectations, plans or forecasts of future events and views as of the date of this communication. Rimini Street anticipates that subsequent events and developments will cause Rimini Street's assessments to change. However, while Rimini Street may elect to update these forward-looking statements at some point in the future, Rimini Street specifically disclaims any obligation to do so, except as required by law. These forward-looking statements should not be relied upon as representing Rimini Street's assessments as of any date subsequent to the date of this communication. Non-GAAP Financial Measures This communication contains certain "non-GAAP financial measures." Non- GAAP financial measures are not based on a comprehensive set of accounting rules or principles. This non- GAAP information supplements and is not intended to represent a measure of performance in accordance with disclosures required by U.S. generally accepted accounting principles, or GAAP. Non-GAAP financial measures should be considered in addition to, and not as a substitute for or superior to, financial measures determined in accordance with GAAP. A reconciliation of GAAP to non-GAAP results is included in the financial tables included in this presentation. Presented under the heading "About Non-GAAP Financial Measures and Certain Key Metrics" is a description and explanation of our non-GAAP financial measures. Property of Rimini Street 2023 | Proprietary and Confidential 2