***PRESS-RELEASE: Rimini Street UK Once Again Ranked in the Top 20 for 2021 UK's Best Workplaces™ in Tech

Company receives employee recognition for a consistently great workplace experience for second consecutive year

Las Vegas & London - October 4, BUSINESS WIRE - Rimini Street, Inc. (Nasdaq: RMNI), a global provider of enterprise software products and services, the leading third-party support provider for Oracle and SAP software products and a Salesforce partner, today announced it has been ranked in the 2021 UK's Best Workplaces™ in Tech in the medium-sized firm category. This achievement follows a top 10 ranking in the 2021 UK's Best Workplaces™, a top 20 ranking in the 2021 UK's Best Workplaces™ for Women, as well as recognition last year as a Great Place to Work-Certified™ Company (GPTW) in the UK and achieving "Excellence in Wellbeing." Today's recognition sees Rimini Street maintain its top 20 ranking from 2020, when it was acknowledged in the 2020 Best Workplaces™ in Tech for medium-sized companies.

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Company Achieves 2021 UK's Best Workplaces™ in Tech

Rimini Street UK employees completed a survey which led to the Company receiving a Trust Index© Score and a score for employee engagement. The Trust Index© Score evaluates employee experience while the Culture Audit© assesses HR and leadership practices within organizations that create a great workplace culture. Rimini Street achieved its ranking because employees across the organization reported a consistently great workplace experience, considering factors such as physical and mental wellbeing, fairness, camaraderie and trust in its leadership. Creating this workplace culture has given employees an inclusive, innovative and productive environment, whether they are working remotely or in the office.

"Those within the UK's tech space who have actively prioritized building a positive employee experience and supported their people's personal wellbeing are the ones we're proud to celebrate today," said Benedict Gautrey, managing director of Great Place to Work® UK. "In this fourth year of recognising UK's Best Workplaces™ in Tech, many of these firms experienced rapid growth, but never lost sight of their values. They maintained their mantra of 'putting people first', often finding innovative and creative solutions to drive their great workplace culture remotely."

"We are humbled once again to have this level of support from our Rimini Street UK family and honored to receive this recognition from Great Place to Work® for the second year in a row," said Emmanuelle Hose, group vice president and theatre general manager, Europe, Middle East and Africa, Rimini Street. "We are able to attract and retain top talent in the UK and globally because we have a great culture that is centered around our people and around delivering the best service to our clients."

Great Place to Work® is the global authority on workplace culture, helping organizations to create exceptional, high-performing workplaces where employees feel trusted and valued. The UK's Best Workplaces™ in Tech awards enable these outstanding organizations to celebrate their achievements, build their employer brand and inspire others to take action.

About Rimini Street, Inc.

Rimini Street, Inc. (Nasdaq: RMNI), a Russell 2000® Company, is a global provider of enterprise software products and services, the leading third-party support provider for Oracle and SAP software products and a Salesforce partner. The Company offers premium, ultra-responsive and integrated application management and support services that enable enterprise software licensees to save significant costs, free up resources for innovation and achieve better business outcomes. To date, more than 4,000 Fortune 500, Fortune Global 100, midmarket, public sector and other organisations from a broad range of industries have relied on Rimini Street as their trusted application enterprise software products and services provider. To learn more, please visit http://www.riministreet.com, follow @riministreet on Twitter and find Rimini Street on Facebook and LinkedIn.

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 "may," "should," "would," "plan," "intend," "anticipate," "believe," "estimate," "predict," "potential," "seem," "seek," "continue," "future," "will," "expect," "outlook" 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, the duration of and operational and financial impacts on our business of the COVID-19 pandemic and related economic impact, as well as the actions taken by governmental authorities, clients or others in response to the COVID-19 pandemic; catastrophic events that disrupt our business or that of our current and prospective clients, changes in the business environment in which Rimini Street operates, including inflation and interest rates, and general financial, economic, regulatory and political conditions affecting the industry in which Rimini Street operates; adverse developments in pending litigation or in the government inquiry or any new litigation; 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 initiatives; the sufficiency of our cash and cash equivalents to meet our liquidity requirements; the terms and impact of our outstanding 13.00% Series A Preferred Stock; our ability to maintain an effective system of internal control over financial reporting, and our ability to remediate identified material weaknesses in our internal controls, including in relation to the accounting treatment of our warrants; changes in taxes, laws and regulations; competitive product and pricing activity; difficulties of managing growth profitably; the customer adoption of our recently introduced products and services, including our Application Management Services (AMS), Rimini Street Advanced Database Security, and services for Salesforce Sales Cloud and Service Cloud products, in addition to other products and services we expect to introduce in the near future; the loss of one or more members of Rimini Street's management team; uncertainty as to the long-term value of Rimini Street's equity securities; and those discussed under the heading "Risk Factors" in Rimini Street's Quarterly Report on Form 10-Q filed on May 10, 2021, 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.

© 2021 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.

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Contacts:

Michelle McGlocklin

Rimini Street, Inc.

+1 925 523-8414

mmcglocklin@riministreet.com

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