Rimini Street, Inc. and GP Investments Acquisition Corp. Announce Signing of Definitive Merger Agreement

Transaction will provide Rimini Street additional growth capital to expand service offerings and capabilities, strengthen balance sheet, and fund potential acquisitions; Combined company to be named Rimini Street, Inc. and trade on NASDAQ as “RMNI”

LAS VEGAS and NEW YORK, May 16, 2017 – Rimini Street, Inc. (“Rimini Street” or the “Company”) and GP Investments Acquisition Corp. (NASDAQ: GPIA; GPIAW; GPIAU) (“GPIAC”) have entered into a definitive merger agreement, which will result in the merger of Rimini Street with and into GPIAC. At closing of the transaction, GPIAC is expected to be renamed Rimini Street, Inc. and continue trading on NASDAQ under the new ticker symbol “RMNI.”

Rimini Street, founded in 2005, is the leading global provider of independent enterprise software support services. The Company provides subscription-based support services for software products licensed by Oracle Corporation, SAP SE and other software vendors. As of March 31, 2017, Rimini Street has reported annual run-rate revenues exceeding $196 million and has achieved a revenue CAGR of 37% since 2014. The Company employs approximately 900 professionals across 13 countries of operation, and currently serves over 1,200 clients – including nearly 100 of the Fortune 500 and Global 100.

GPIAC is a special purpose acquisition company (SPAC) created by GP Investments in May 2015 via an IPO that raised $172.5 million in proceeds for the purpose of investing in companies with long-term growth potential in the consumer and services sectors.

Upon transaction closing, Seth A. Ravin, founder, CEO and chairman of the board of directors of Rimini Street, will be appointed CEO and chairman of the board of directors of the combined entity. At closing, the board of directors of the combined entity is expected to consist of nine directors, of which seven (including Mr. Ravin) will be designated by Rimini Street and two will be designated by GPIAC.

“As a high-growth company capitalizing on a large, global addressable market, Rimini Street presents an attractive investment opportunity. The Company’s client value proposition, seasoned management team, track record of execution and years of consecutive growth are very compelling,” said Antonio Bonchristiano, CEO of GPIAC and GP Investments, Ltd. “Rimini Street is a proven innovator and market disruptor.”

“Rimini Street has delivered 45 consecutive quarters of revenue growth by providing value-driven, innovative support solutions and exceptional service that meet the global needs of enterprise software licensees. The combination with GPIAC will provide Rimini Street additional growth capital to expand service offerings and capabilities, strengthen our balance sheet and fund potential acquisitions,” said Mr. Ravin. “We believe that having a public company structure will further fuel our growth by facilitating additional sales opportunities and providing additional capital market access. We are pleased to enter into this transaction and work with GP Investments, Ltd. as a new investor and business partner with a proven track record of providing value to growth companies.”

Transaction Details

Under the terms of the definitive agreement, the transaction will be funded via the issuance of approximately 63.8 million shares of GPIAC common stock at $10.00 per share to Rimini Street’s shareholders. Cash at closing in GPIAC’s trust account and cash proceeds from the issuance of up to 3.5 million shares of GPIAC common stock at $10.00 per share to an affiliate of GP Investments, Ltd. will provide required cash at closing used to pay certain transaction expenses, reduce net debt and provide additional balance sheet cash.

The anticipated initial enterprise value is approximately $837 million, implying a multiple of 2.8x 2018E revenue of $295 million, with a post-closing equity value of $854 million at $10.00 per share. At consummation of the transaction, a merger subsidiary of GPIAC will merge with and into Rimini Street, with Rimini Street as the surviving entity, which would then merge with and into GPIAC, which will move its jurisdiction of incorporation from the Cayman Islands to the State of Delaware prior to consummation.

After giving effect to the transaction and certain assumptions, current GPIAC shareholders are expected to own approximately 25% of the combined company on a fully-diluted basis, and current Rimini Street shareholders will exchange their Rimini Street shares for approximately 75% pro forma ownership of the combined company.

The transaction, which has been approved by the boards of directors of both companies, is subject to approval of GPIAC and Rimini Street shareholders and the satisfaction or waiver of customary closing conditions, including regulatory approvals.

Rimini Street shareholders representing a sufficient amount of Rimini Street’s capital stock necessary to approve the transaction have entered into a transaction support and voting agreement pursuant to which they have agreed to support and vote all of their shares in favor of the transaction. In addition, at its previously announced extraordinary general meeting to be held on May 23, 2017, GPIAC shareholders of record at the close of business on April 24, 2017 must approve certain proposals relating to the proposed extension from May 26, 2017 to November 27, 2017, the date by which GPIAC must consummate an initial business combination.

Assuming receipt of such shareholder approvals, government approvals and satisfaction of all closing conditions, the transaction is expected to close in the third quarter of 2017.

Citigroup served as financial and capital markets advisor to GPIAC. Cowen and Company served as financial and capital markets advisor to Rimini Street. Skadden, Arps, Slate, Meagher & Flom LLP acted as legal advisor to GPIAC, and Wilson Sonsini Goodrich & Rosati acted as legal advisor to Rimini Street.

Conference Call and Investor Presentation

GPIAC and Rimini Street will hold a conference call to discuss the transaction on Tuesday, May 16, 2017, at 10:00 a.m. EDT. The conference call can be accessed by dialing 1-855-327-6837 (domestic), or 1-631-891-4304 (international), and asking to join the GP Investments Acquisition Corp. conference call. Interested investors and other parties may also view the accompanying investor presentation filed today with the Securities and Exchange Commission, and which can be viewed on the SEC website at www.sec.gov. A replay of the call will be made available and can be accessed by dialing 1-844-512-2921 (domestic), or 1-412-317-6671 (international), and entering the conference ID number 10003036.

About Rimini Street, Inc.

Rimini Street, Inc. (Nasdaq: RMNI) 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 3,500 Fortune 500, Fortune Global 100, midmarket, public sector and other organizations 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 https://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 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 economic, operational and financial impacts on Rimini Street’s business of the COVID-19 pandemic, as well as the actions taken by governmental authorities, clients or others in response to the COVID-19 pandemic; catastrophic events that disrupt Rimini Street’s business or that of its 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; Rimini Street’s need and ability to raise additional equity or debt financing on favorable terms and Rimini Street’s ability to generate cash flows from operations to help fund increased investment in Rimini Street’s growth initiatives; the sufficiency of Rimini Street’s cash and cash equivalents to meet its liquidity requirements; the terms and impact of Rimini Street’s outstanding 13.00% Series A Preferred Stock; changes in taxes, laws and regulations; competitive product and pricing activity; difficulties of managing growth profitably; the customer adoption of Rimini Street’s recently introduced products and services, including its 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 Rimini Street expects 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 risks discussed under the heading “Risk Factors” in Rimini Street’s Quarterly Report on Form 10-Q filed on August 5, 2020 and as updated from time to time by 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.

About GP Investments Acquisition Corp.

GP Investments Acquisition Corp. (GPIAC) was created by GP Investments in May 2015 via an IPO that raised $172.5 million in proceeds for the purpose of identifying attractive investment opportunities in the United States or Europe, with a focus on companies with long-term growth potential in the consumer and services sectors. The creation of GPIAC is consistent with GP Investments’ strategy of growing its assets under management via expansion into different geographies and asset classes, primarily in the form of permanent capital. The Company’s sponsor is GPIC, Ltd., a wholly owned subsidiary of GP Investments, Ltd.

About GP Investments, Ltd.

GP Investments, Ltd. is a leading alternative investments firm with more than 20 years’ experience in corporate investing. The company has a strong track record of successful equity capital market transactions, delivering strong returns and building long-lasting enterprises. Since its inception, the company has raised approximately $5 billion from international investors and has invested in more than 50 companies across 15 sectors. In May 2006, GP Investments, Ltd. completed its initial public offering (IPO), becoming the first listed private equity firm in Brazil. For more information, please see GP Investments Ltd.’s web site www.gp-investments.com.

No Offer or Solicitation

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to buy or an invitation to purchase any securities or the solicitation of any vote or approval in any jurisdiction in connection with the proposed business combination between Rimini Street and GPIAC or otherwise, nor shall there be any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law.

Important Information for Investors and Stockholders

In connection with the proposed extension of the date by which GPIAC must consummate an initial business combination, GPIAC filed with the SEC a definitive proxy statement, dated April 24, 2017 and first mailed to shareholders on or about such date (the “Extension Proxy Statement”).

In connection with the transactions referred to in this communication, GPIAC expects to file a registration statement on Form S-4 with the SEC containing a preliminary joint proxy statement of GPIAC and Rimini Street that also constitutes a preliminary prospectus of GPIAC. After the registration statement is declared effective GPIAC and Rimini will mail a definitive joint proxy statement/prospectus to stockholders of GPIAC and stockholders of Rimini Street.

This communication is not a substitute for the Extension Proxy Statement, the joint proxy statement/prospectus or registration statement or for any other document that GPIAC may file with the SEC and send to GPIAC’s stockholders and/or Rimini Street’s stockholders in connection with the proposed transactions. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE EXTENSION PROXY STATEMENT, THE JOINT PROXY STATEMENT/PROSPECTUS AND OTHER DOCUMENTS FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION. Investors and security holders may obtain free copies of the Extension Proxy Statement, the joint proxy statement/prospectus (when available) and other documents filed with the SEC by GPIAC through the website maintained by the SEC at http://www.sec.gov. Copies of the documents filed with the SEC by GPIAC are available free of charge by contacting GPIAC at 150 E. 52nd Street, Suite 5003, New York, New York 10022, Attn: Investor Relations.

Participants in the Solicitation

GPIAC and its directors and executive officers and other persons may be may be considered participants in the solicitation of proxies with respect to the proposed extension of the date by which GPIAC must consummate an initial business combination under the rules of the SEC. GPIAC and Rimini Street and their respective directors and certain of their respective executive officers may be considered participants in the solicitation of proxies with respect to the proposed transactions under the rules of the SEC. Information about the directors and executive officers of GPIAC is set forth in its Annual Report on Form 10-K for the year ended December 31, 2016, which was filed with the SEC on March 16, 2017. Additional information regarding the participants in the proxy solicitations and a description of their direct and indirect interests, by security holdings or otherwise, are included in the Extension Proxy Statement and also will be included in the joint proxy statement/prospectus and other relevant materials to be filed with the SEC when they become available. These documents can be obtained free of charge from the sources indicated above.

© 2020 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 relations contact:

Dean Pohl

Rimini Street, Inc.

+1 925-523-7636 dpohl@riministreet.com

Media relations contact:

Janet Ravin