Rimini Street appoints Keith Costello as EVP and Chief Operating Officer and Alexander Guasch as EVP and Chief Delivery Officer

Rimini Street, Inc. (NASDAQ:RMNI), the Software Support and Agentic AI ERP Company™ and the leading third-party support provider for Oracle, SAP and VMware software, today announced the appointment of Keith Costello as chief operating officer (COO) and Alexander Guasch as chief delivery officer (CDO).

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Rimini Street Expands C-Suite Leadership for Growth with Appointment of Two Proven Industry Veterans as Chief Operating Officer and Chief Delivery Officer

New COO Brings Proven Experience Scaling Organizations for Growth

Keith Costello brings decades of experience building and scaling global enterprise software and services organizations, including leading teams of tens of thousands and managing businesses generating billions of dollars in revenue. He previously served as president, enterprise applications, technology, consulting and engineering services at DXC Technology and general manager for IBM’s global SAP business unit. Earlier, he completed eight years at SAP in various senior leadership roles, including executive vice president and general manager of business analytics and technology solutions, senior vice president of global field services and chief customer officer.

As COO, Costello will own product strategy, determining what products, services and solutions Rimini Street will bring to market. He will also own the professional services sales function and other global business operations, which he will take over from Rimini Street president and CEO Seth Ravin.

"It’s an exciting time at Rimini Street. The company has successfully sold billions of dollars of services and built a differentiated offering that helps clients unlock more value from their mission-critical enterprise systems while gaining greater control over their technology roadmaps," said Costello. "I’m looking forward to working with the global team to scale operations, strengthen execution and support the company’s continued growth worldwide."

New CDO Brings Global Delivery Leadership and Client-Focused Execution

Alex Guasch is a seasoned leader with more than 30 years of experience leading integrated global IT service delivery organizations with thousands of professionals. He has led numerous initiatives across enterprise software support, managed services, consulting, modernization, cloud transformation and AI-enabled innovation. Guasch formerly served in senior executive roles at HPE, IBM, VMware and Cognizant and has held leadership positions at Effectual and Optiv.

As Rimini Street CDO, he is responsible for the end-to-end development and delivery of all company products, services and solutions worldwide, assuring reliable operational excellence, unparalleled service quality and successful client outcomes.

"Client success starts with consistent, high-quality delivery, especially for the mission-critical systems that keep global organizations and government clients running smoothly," said Guasch. "I’m pleased to join Rimini Street and lead an organization that has a storied reputation as one of the best enterprise software and technology engineering teams in the world, delivering 24/7/365 service globally with an average two-minute response time and client satisfaction ratings of 4.9 out of 5.0."

Rimini Street is firmly focused on executing its operating plan to accelerate revenue growth and increase profitability. These expanded leadership roles strengthen execution, scale global operations and support continued client success.

"Keith and Alex bring the global operating experience, execution discipline and client-first leadership to scale our organization with speed and quality," said Seth Ravin, president and CEO, Rimini Street. "Keith and Alex understand what it takes to run and grow complex technology organizations and deliver extraordinary client outcomes. They are welcome additions to our leadership team as we continue helping clients use technology to lower their total operating costs, improve profitability and enhance competitive advantage."

About Rimini Street, Inc.

Rimini Street, Inc. (NASDAQ:RMNI), a Russell 2000^® Company, is a proven, trusted global provider of end-to-end, mission-critical enterprise software support, managed services and innovative Agentic AI ERP solutions, and is the leading third-party support provider for Oracle, SAP and VMware software. The Company has signed thousands of IT service contracts with Fortune Global 100, Fortune 500, midmarket, public sector and government organizations who have leveraged the Rimini Smart Path™ methodology to achieve better operational outcomes, billions of US dollars in savings and fund AI and other innovation.

To learn more, please visit www.riministreet.com, and connect with Rimini Street on X, Facebook, Instagram, 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 "anticipate," "assume," "believe," "budget," "continue," "could," "currently," "estimate," "expect," "forecast," "future," "intend," "may," "might," "outlook," "plan," "possible," "goal," "potential," "predict," "project," "reflect," "results," "seem," "seek," "should," "will," "would" and 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 our ability to attract new clients or retain and/or sell additional products or services to existing clients; our ability to achieve and maintain an adequate rate of revenue growth; cost of revenue, including changes in costs associated with our efforts to grow and the results of any efforts to manage costs to align with current revenue expectations and the expansion of our offerings; the effects of increased intense competition in our industry and our ability to compete effectively; our ability to successfully educate the market regarding the advantages of our support and managed services for ERP software and to sell the products and services comprising our "Rimini Smart Path™" solutions portfolio, including but not limited to our Agentic AI ERP solutions; our intentions with respect to our pricing model and expectations of client savings relative to use of other providers; the evolution of the ERP software management and support landscape facing our clients and prospects; estimates of our total addressable market; the effects of seasonal trends on our results of operations, including the contract renewal cycles for vendor-supplied software support and managed services; the effects of the efforts of enterprise software vendors to sell upgrades or migrations to cloud-based versions of their enterprise software on our results of operations; our ability to scale our operations quickly enough to meet our clients’ changing needs or decrease our costs adequately in response to changing client demand; risks arising from incorporating artificial intelligence ("AI") technologies into our products or services or any deficiencies associated with AI technologies used by us or by our third-party vendors and service providers; our ability to maintain, protect, and enhance our brand; the loss of one or more members of our management team and our ability to attract and retain additional qualified technical, sales and marketing personnel; our ability to expand our marketing and sales capabilities; our ability to avoid interruptions to, or degraded performance of, our services and the impact of any such interruptions or performance problems on our operations; our ability to defend against cybersecurity threats and to comply with data protection and privacy regulations; our expectations regarding new product offerings, innovation solutions, partnerships and alliance programs and our ability to develop and maintain strategic partnerships; our ability to expand internationally and the risks associated with global operations; our wind down of support services for Oracle’s PeopleSoft software products and the impact on future period revenue and costs incurred related to these efforts; the continuing impact of and our ability to comply with the terms of our July 2025 settlement agreement with Oracle; the impact of macro-economic trends, including inflation 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; our ability to generate significant capital through our operations or to raise additional capital necessary to fund and expand our operations and invest in new services and products; our business plan and our ability to effectively secure and manage our growth and associated investments; risks relating to retention rates, including our ability to accurately predict retention rates; our ability to protect our intellectual property; our ability to maintain an effective system of internal control over financial reporting; changes in laws or regulations, including tax laws or unfavorable outcomes of tax positions we take; tariff costs; our ability to realize benefits from our net operating losses; any negative impact of environmental, social and governance ("ESG") matters on our reputation or business and the exposure of our business to additional costs or risks from our reporting on such matters; our credit facility’s ongoing debt service obligations and financial and operational covenants on our business and related interest rate risk; the sufficiency of our cash and cash equivalents to meet our liquidity requirements; the volatility of our stock price; the amount and timing of repurchases, if any, under our stock repurchase program and our ability to enhance stockholder value through such program; our ability to maintain our good standing with the United States and international governments and capture new contracts with public sector entities; the occurrence of catastrophic events that may disrupt our business or that of our current and prospective clients; future acquisitions of, or investments in, complementary companies, products, subscriptions or technologies; and those discussed under the heading "Risk Factors" in Rimini Street’s Quarterly Report on Form 10-Q filed on July 30, 2026, 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 U.S. 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.

© 2026 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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Janet Ravin

VP, Corporate Marketing

Rimini Street, Inc.

+1 702 285-3532

pr@riministreet.com