3993 Howard Hughes Parkway, Suite 500
Las Vegas, NV 89169
(702) 839-9671
(Address, including zip code, and telephone number, including area code, of Registrant’s principal
executive offices)

Seth A. Ravin
Chief Executive Officer
Rimini Street, Inc.
3993 Howard Hughes Parkway, Suite 500
Las Vegas, NV 89169
(702) 839-9671
(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:

Approximate date of commencement of proposed sale to the public: From time to time after this Registration Statement becomes effective.

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. ¨

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933 (the “Securities Act”), other than securities offered only in connection with dividend or interest reinvestment plans, check the following box. x

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ¨

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ¨

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box. ¨

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box. ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Securities Exchange Act of 1934 (the “Exchange Act”).

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ¨

The registrant hereby amends this registration statement on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment which specifically states that this registration statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933, as amended, or until this registration statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to said Section 8(a), may determine.

EXPLANATORY NOTE

This registration statement contains a base prospectus that covers the offering, issuance and sale by us of up to $200,000,000 in the aggregate of our common stock, preferred stock and warrants, in each case from time to time in one or more offerings.

The base prospectus immediately follows this explanatory note. The specific terms of any securities to be offered pursuant to the base prospectus will be specified in a prospectus supplement to the base prospectus.

The information in this prospectus is not complete and may be changed. These securities may not be sold until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities, nor does it seek an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.

Subject to Completion, dated March 2, 2022

ProspectusPROSPECTUS

23,824,357

$200,000,000

Rimini Street, Inc.

SharesCommon Stock
Preferred Stock
Warrants

This prospectus covers the resaleFrom time to time, in one or more offerings, we may offer and sell up to $200,000,000 of an aggregate of 23,824,357 shares ofour (i) common stock, $0.0001 par value per share (the “Common Stock”)(ii) preferred stock and (iii) warrants, or any combination of Rimini Street, Inc. (“Company,” “we,” “our,”these securities. Specific terms of such sales will be provided in supplements to this prospectus. Any prospectus supplements also will describe the specific manner in which these securities will be offered and may supplement, update or “us”) by the selling securityholders identifiedamend information contained in this prospectus (collectivelyprospectus. We may also authorize one or more free writing prospectuses to be provided to you in connection with any of the holders’ transferees, pledgees, donees or successors, the “selling securityholders”).

The 23,824,357 shares of Common Stock include:

(i) 23,659,431 shares of Common Stock to be sold by the selling securityholders named herein;

(ii) 137,361 shares of Common Stock issuable upon the exercise of stock options that were granted to one selling securityholder pursuant to the 2013 Equity Incentive Plan (the “Plan”); and

(iii) 27,565 shares of Common Stock issuable upon the vesting and settlement into shares of Common Stock of outstanding restricted stock units that were granted to a selling securityholder pursuant to the Plan.

In this prospectus, we refer to the 23,824,357 shares of Common Stock as the “Securities.”these offerings.

We are registering themay offer and salesell these securities through one or more underwriters, dealers and agents, or directly to investors, in amounts, at prices and on terms to be determined by market conditions and other factors at the time of the Securities to: (i) satisfy certain registration rights we have granted to certain of the selling securityholders; (ii) facilitate the sale of such Securities (including the Common Stock underlying convertible securities); and (iii) increase the public float and liquidity of our Common Stock without causing dilution to our existing shareholders.

We will not receiveoffering. The securities may be sold by any of the proceeds from the sale of the Securities by the selling securityholders.

The selling securityholders may sell the Securitiesmeans described in the section of this prospectus in a number of different ways and at varying prices. We provide more information about how the selling securityholders may sell their Securities in the section titled “Plan of Distribution.” beginning on page 13 of this prospectus or by any means described in any applicable prospectus supplement.

The selling securityholdersAny prospectus supplements and related free writing prospectuses may selladd, update or change information contained in this prospectus. You should carefully read this prospectus and any all or none ofaccompanying prospectus supplement, together with the Securities anddocuments we do not know when orincorporate by reference, before you invest in what amount the selling securityholders may sell their Securities hereunder following the effective date of this registration statement.our securities.

Our Common Stockcommon stock is listed on the Nasdaq Global Market (“Nasdaq”) under the symbol “RMNI.” On February 25, 2022, the last reported sale price for our Common Stockcommon stock as reported on Nasdaq was $4.68 per share.

Investing in our securities involves a high degree of risk. Before buying any securities, you should carefully read the discussion of the risks of investing in our securities in the section titled “Risk Factors” beginning on page 76 of this prospectus.prospectus.

You should rely only on the information contained in or incorporated by reference into this prospectus or any prospectus supplement or amendment hereto. We have not authorized anyone to provide you with different information.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus is                      , 2022.,2022.

TABLE OF CONTENTS

You should read this prospectus, any applicable prospectus supplement and the information incorporated by reference in this prospectus before making an investment in the securities of Rimini Street, Inc. See the section titled “Where You Can Find Additional Information” for additional information. You should rely only on the information contained in or incorporated by reference in this prospectus or a prospectus supplement. Neither we nor the selling securityholdersWe have not authorized anyone to provide you with different information. This document may be used only in jurisdictions where offers and sales of these securities are permitted. You should assume that information contained in this prospectus, or in any document incorporated by reference, is accurate only as of any date on the front cover of the applicable document. Our business, financial condition, results of operations and prospects may have changed since that date.

The Rimini Street design logo and the Rimini Street mark appearing in this prospectus are the property of Rimini Street, Inc. Trade names, trademarks and service marks of other companies appearing in this prospectus are the property of their respective holders. We have omitted the ® and ™ designations, as applicable, for the trademarks used in this prospectus.

ABOUT THIS PROSPECTUS

This prospectus is part of a registration statement on Form S-3 that we filed with the Securities and Exchange Commission (the “SEC”) under the Securities Actutilizing a “shelf” registration process. Under this shelf registration process, we may, over time, offer and sell up to $200,000,000 in total initial aggregate offering price of 1933, as amended (the “Securities Act”). Under the registration statement, the selling securityholders may, from time to time, sell the offered Securitiesany combination of securities described in this prospectus. We will not receive any proceeds fromprospectus, in one or more offerings and at prices and on terms that we determine at the sale by such selling securityholderstime of the offered Securities described in this prospectus.offering.

Additionally,This prospectus provides you with a general description of the securities we may provide aoffer. Any accompanying prospectus supplement tomay add, update or change information contained in this prospectus.

This prospectus does not contain all of If the information included in the registration statement. We have omitted parts of the registration statement in accordance with the rules and regulations of the SEC. For further information, we refer you to the registration statement on Form S-3 of which this prospectus is a part, including its exhibits, and the documents incorporated by reference herein. Statements contained invaries between this prospectus and any accompanying prospectus supplement, aboutyou should rely on the provisionsinformation in the accompanying prospectus supplement. We may also authorize one or contents of any agreement or other document are not necessarily complete.more free writing prospectuses to be provided to you that may contain material information relating to these offerings. You should read both this prospectus and anythe accompanying prospectus supplement and any free writing prospectus together with the additional information described below under the heading “Where You Can Find Additional Information.” herein. You should also carefully consider, among other things, the matters discussed in the section titled “Risk Factors” herein, the accompanying prospectus supplements,supplement and any related free writing prospectus, and under similar headings in any other documents that are incorporated by reference into this prospectus, the accompanying prospectus supplement.supplement and any related free writing prospectus.

This prospectus contains summaries of certain provisions contained in some of the documents described herein, but reference is made to the actual documents for complete information. All of the summaries are qualified in their entirety by the actual documents. Copies of some of the documents referred to herein have been filed, will be filed or will be incorporated by reference as exhibits to the registration statement of which this prospectus is a part, and you may obtain copies of those documents as described below under the heading “Where You Can Find Additional Information.”

THIS PROSPECTUS MAY NOT BE USED TO SELL ANY SECURITIES
UNLESS ACCOMPANIED BY A PROSPECTUS SUPPLEMENT

You should rely only on the information contained or incorporated by reference in this prospectus and any prospectus supplement. We have not authorized anyone to provide you with any other information. If you receive any other information, you should not rely on it. No offer to sell these securities is being made in any jurisdiction where the offer or sale is not permitted. You should not assume that the information contained in this prospectus and, if applicable, any prospectus supplement or any document incorporated by reference in this prospectus or any prospectus supplement, is accurate as of any date other than the date on the front cover of this prospectus or on the front cover of the applicable prospectus supplement or documents or as specifically indicated in the document. Our business, financial condition, results of operations and prospects may have changed since that date.

You should read both this prospectus and any prospectus supplement together with the additional information described below under the heading “Where You Can Find Additional Information” in this prospectus. Unless expressly indicated or the context requires otherwise, the terms “Rimini,” “Rimini Street,” “RMNI,” the “Company,” the “Registrant,” “we,” “us” and “our” in this prospectus refer to the parent entity formerly named GP Investments Acquisition Corp., after giving effect to the business combination, and as renamed Rimini Street, Inc., and where appropriate, our wholly-owned subsidiaries.

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This prospectus includes forward-looking statements. All statements other than statements of historical facts contained in this prospectus, including statements regarding our future results of operations and financial position, business strategy and plans, and our objectives for future operations, are forward-looking statements. The words “anticipate,” “believe,” “can,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “seek,” “should,” “will,” “would” and similar expressions that convey uncertainty of future events or outcomes are intended to identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. Forward-looking statements include, but are not limited to, information concerning:

We have based these forward-looking statements largely on our current expectations and projections about future events and financial trends that we believe may affect our financial condition, results of operations, business strategy, short-term and long-term business operations and objectives and financial needs. These forward-looking statements are subject to a number of risks, uncertainties and assumptions that are difficult to predict and many of which are outside of our control, including those described in the section titled “Risk Factors” herein, in any applicable prospectus supplement and in the documentation incorporated by reference herein. Moreover, we operate in a very competitive and rapidly changing market. New risks emerge from time to time. It is not possible for our management to predict all risks, nor can we assess the impact of all factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements we may make. In light of these risks, uncertainties and assumptions, the forward-looking events and circumstances discussed in this prospectus may not occur and actual results could differ materially and adversely from those anticipated or implied in the forward-looking statements.

You should not rely upon forward-looking statements as predictions of future events. Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee that the future results, levels of activity, performance or events and circumstances reflected in the forward-looking statements will be achieved or occur. Moreover, neither we nor any other person assumes responsibility for the accuracy and completeness of the forward-looking statements. The forward-looking statements in this prospectus are made as of the date of the filing, and except as required by law, we disclaim and do not undertake any obligation to update or revise publicly any forward-looking statements in this prospectus. You should read this prospectus and the documents that we reference in this prospectus and have filed with the SEC as exhibits to the registration statement of which this prospectus is a part with the understanding that our actual future results, levels of activity and performance, as well as other events and circumstances, may be materially different from what we expect.

ABOUT RIMINI STREET, INC.

OVERVIEW

Rimini Street, Inc. and its subsidiaries (together, the “Company” or “we”) is a global provider of enterprise software support products and services, and the leading independent software support provider for Oracle and SAP products, based on both the number of active clients supported and recognition by industry analyst firms. We founded our company to disrupt and redefine the enterprise software support market by developing and delivering innovative new products and services that fill a then unmet need in the market. We believe we have achieved and sustained our leadership position in independent enterprise software support by delivering on our mission to provide extraordinary technology solutions that achieve each client’s strategic, operational, and financial goals.

In September 2020, we announced the global availability of our award-winning, mission-critical, 24x7x365 support, application management, security and migration services beyond proprietary databases to leading open source database platforms, including MySQL, MariaDB, PostgreSQL and MongoDB.

In November 2019, we announced the global availability of our Application Management Services (“AMS”) for Oracle, which includes coverage for Oracle Database, Middleware and a wide range of Oracle applications including E-Business Suite, JD Edwards, PeopleSoft and Siebel. In addition to leveraging our support services for Oracle that replaces expensive and less robust software vendor annual support with a more responsive and comprehensive support offering, our clients can now have us manage their Oracle systems day-to-day with an integrated application management and support service provided by a single trusted vendor. As an integrated service, we believe we can provide clients a better model, better people, and better outcomes with higher satisfaction and significant savings of time, labor and money. The AMS for Oracle includes system administration, operational support, health monitoring and enhancement support.

In August 2019, we announced plans to globally offer AMS for SAP enterprise software, expanding the scope of support services we offer clients globally. This AMS service is in addition to our traditional enterprise Support Services. We are already providing this new SAP AMS service to clients in North and South America. The service includes system administration and SAP Basis support, system health monitoring with proactive analysis, preventative system recommendations and event detection; and enhancement support for complex SAP software landscapes.

In 2018 we announced support for Software as a Service (“SaaS”) solutions beginning with Salesforce products. As a partner of Salesforce, we provide our award-winning service and support for custom code, release updates and application integrations in addition to ongoing administrative, configuration and enhancement of Salesforce’s industry leading cloud solutions. We also provide support to clients for additional SaaS solutions that we will formally announce in the future. By providing support for SaaS as well as traditionally licensed enterprise software, Rimini Street unifies support for its clients across applications and software delivery models from one trusted provider, creating efficiencies and savings, simplifying support processes and enabling improved support outcomes.

Enterprise software support products and services is one of the largest categories of overall global information technology (“IT”) spending. We believe core enterprise resource planning, customer relationship management, product lifecycle management and technology software platforms have become increasingly important in the operation of mission-critical business processes over the last 30 years, and also that the costs associated with failure, downtime, security exposure and maintaining the tax, legal and regulatory compliance of these core software systems have also increased. As a result, we believe that licensees often view software support as a mandatory cost of doing business, resulting in recurring and highly profitable revenue streams for enterprise software vendors. For example, for fiscal year 2021, SAP reported that support revenue represented approximately 41% of its total revenue and, for fiscal year 2021, Oracle reported a margin of 85% for cloud services and license support.

We believe that software vendor support is an increasingly costly model that has not evolved to offer licensees the responsiveness, quality, breadth of capabilities or value needed to meet the needs of licensees. Organizations are under increasing pressure to reduce their IT costs while also delivering improved business performance through the adoption and integration of emerging technologies, such as mobile, virtualization, internet of things and cloud computing. Today, however, the majority of IT budget is spent operating and maintaining existing infrastructure and systems, in part as a result of software vendor policies and support models that are designed to benefit the vendor and force organizations to follow a vendor-dictated roadmap. As a result, we believe organizations are increasingly seeking ways to create competitive advantage and growth by redirecting budgets from expensive maintenance programs and costs to new technology investments that provide greater strategic value. We believe our software products and services help clients achieve these objectives by reducing the total cost of support.

We believe that AMS for enterprise software is a large market with significant unmet needs in client satisfaction and value. Traditional AMS providers compete on price, but the traditional AMS model is broken with a focus on a “land and expand” model based on initial cheaper, less-skilled workers but higher costs over time and frequently poor client satisfaction or degradation in service over time. Providers usually contract for lower-cost services with a goal to grow revenue through scope creep by adding hours to open tickets or selling new project work. These lower-cost AMS support models sound cost-effective, but their contractual structures can both enable and incent traditional AMS providers to maximize their own revenue at the expense of their clients by “addressing” issues (sometimes neither quickly nor efficiently), but not necessarily resolving them or their root causes. In addition, traditional AMS offerings are disparate and separate from software vendor support, with inherent inefficiencies and gaps that further limit responsiveness, root cause analysis and business value.

We believe organizations are realizing the value of an integrated, expert-led Support and AMS offering that eliminates inefficiencies, realizes joint value from the resolution of root causes that reduce issue volumes over time, and improves client satisfaction. Through our solution offerings, Rimini Street provides expert, ultra-responsive support and AMS, functioning as an extension of IT teams, with engineers available 24x7x365 around the globe for all AMS and enterprise software projects, and to fill skill gaps or help with rightsizing enterprise teams. Rimini Street teams deliver a wide variety of desired outcomes for a broad range of use cases such as supporting entire enterprise software systems, reducing costs, clearing backlogs, or facilitating the redeployment of IT teams for more strategic initiatives.

As of December 31, 2021, we employed over 1,660 professionals and supported over 2,840 active clients globally, including 72 Fortune 500 companies and 16 Fortune Global 100 companies, across a broad range of industries. We define an active client as a distinct entity, such as a company, an educational or government institution, or a business unit of a company that purchases our services to support a specific product. For example, we count as two separate active client instances in circumstances where we provide support for two different products to the same entity. We market and sell our services globally, primarily through our direct sales force, and currently have wholly-owned subsidiaries in Australia, Brazil, UAE (Dubai), France, Germany, Hong Kong, India, Israel, Japan, Korea, Malaysia, Mexico, Netherlands, New Zealand, Poland, Singapore, Sweden, Taiwan, Canada, the United Kingdom and the United States. We believe our primary competitors are the enterprise software vendors whose products we service and support, including IBM, Microsoft, Oracle and SAP.

Our subscription-based revenue provides a strong foundation for, and visibility into, future period results. We generated revenue of $374.4 million, $326.8 million and $281.1 million for the years ended December 31, 2021, 2020 and 2019, respectively, representing a year-over-year increase of 15% and 16% for 2021 and 2020, respectively. We have a history of losses, and as of December 31, 2021, we had an accumulated deficit of $225.8 million. We had net income of $75.2 million, $11.6 million and $21.4 million for the years ended December 31, 2021, 2020 and 2019, respectively. We generated approximately 53%, 59% and 64% of our revenue in the United States and approximately 47%, 41% and 36% of our revenue from our international business for the years ended December 31, 2021, 2020 and 2019, respectively.

CORPORATE INFORMATION

We were incorporated as Rimini Street, Inc. (“RSI”) in the state of Nevada in September 2005. In May 2017, RSI entered into an Agreement and Plan of Merger (the “Merger Agreement”) with GP Investments Acquisition Corp. (“GPIA”), a publicly-held special purpose acquisition company incorporated in the Cayman Islands and formed for the purpose of effecting a business combination with one or more businesses. Substantially all of GPIA’s assets consisted of cash and cash equivalents. The Merger Agreement was approved by the respective shareholders of RSI and GPIA in October 2017, and closing occurred on October 10, 2017, resulting in (i) the merger of a wholly-owned subsidiary of GPIA with and into RSI, with RSI as the surviving corporation, after which (ii) RSI merged with and into GPIA, with GPIA as the surviving corporation (collectively, the “Merger Transactions”). Prior to consummation of the mergers, GPIA domesticated as a Delaware corporation (the “Delaware Domestication”). Immediately after the Delaware Domestication and the consummation of the second merger, GPIA was renamed “Rimini Street, Inc.”

Our principal executive offices are located at 3993 Howard Hughes Parkway, Suite 500, Las Vegas, NV 89169, and our telephone number is (702) 839-9671.

Our website address is www.riministreet.com. The information on, or that can be accessed through, our website is not part of this prospectus.

THE OFFERING

The number of shares of Common Stock outstanding is based on 87,107,419 shares of Common Stock outstanding as of December 31, 2021 and excludes the following:

Our Plan provides for annual automatic increases in the number of shares of Common Stock reserved thereunder.

RISK FACTORS

Investing in our securities involves a high degree of risk. Before making an investment decision, you should carefully consider the risks described in the sectionssection titled “Risk Factors”“Risk Factors” in our most recent Annual Report on Form 10-K and subsequent Quarterly Reports on Form 10-Q, in each case as filed with the SEC, which are incorporated herein by reference in their entirety, as well any amendment or updates to our risk factors reflected in subsequent filings with the SEC, which will be incorporated by reference in this prospectus.prospectus and any applicable prospectus supplement. Our business, financial condition or results of operations could be materially adversely affected by any of these risks. The trading price of our securities could decline due to any of these risks, and you may lose all or part of your investment. This prospectus, any applicable prospectus supplement and the incorporated documents also contain forward-looking statements that involve risks and uncertainties. Our actual results could differ materially from those anticipated in these forward-looking statements as a result of certain factors, including the risks mentioned elsewhere in this prospectus. For more information, see the section titled “Where You Can Find Additional Information.” herein.

USE OF PROCEEDS

All ofUnless otherwise indicated in a prospectus supplement, the shares of Common Stock offered by the selling securityholders pursuant to this prospectus will be sold by the selling securityholders for their respective accounts. We will not receive any of thenet proceeds from the sale of the Securities hereunder.

The selling securityholders will pay any underwriting discounts and commissions and expenses incurredsecurities offered by them for brokerage, accounting, tax or legal services (including fees and disbursements of counsel to the selling securityholder) or stock transfer taxes incurred by themus in disposing of such Securities. We will bear other costs, fees and expenses incurred in effecting the registration of the Securities covered by this prospectus will be used for general corporate purposes, including, without limitation, all registrationbut not limited to, working capital, capital optimization transactions, acquisitions and filing fees, Nasdaq listing fees, and feesother business purposes. We may also invest the proceeds in certificates of our counsel and our independent registered public accountants.deposit, United States government securities, certain other interest-bearing securities or money market securities until the proceeds are applied for specified purposes. If we decide to use the net proceeds from a particular offering for a specific purpose other than as set forth above, we will describe that purpose in the applicable prospectus supplement.

SELLING SECURITYHOLDERS

The following table sets forth information regarding beneficial ownership of our Common Stock as of December 31, 2021, as adjusted to reflect the Securities that may be sold from time to time pursuant to this prospectus, for all selling securityholders.

The shares of Common Stock offered hereunder include:

We have determined beneficial ownership in accordance with the rules of the SEC and the information is not necessarily indicative of beneficial ownership for any other purpose. Unless otherwise indicated below, to our knowledge, the persons and entities named in the table have sole voting and sole investment power with respect to all shares that they beneficially own, subject to community property laws where applicable.

We have based our percentage ownership of our Common Stock prior to this offering upon 87,107,419 shares of our Common Stock outstanding as of December 31, 2021 unless otherwise noted. The following table assumes the sale by the selling securityholders of all shares of common stock registered pursuant to the registration statement of which this prospectus forms a part.

DESCRIPTION OF SECURITIES

GENERAL

The following is a summary of the rights of our securities and certain provisions of our amended and restated certificate of incorporation and amended and restated bylaws and the applicable provisions of the Delaware General Corporation Law (“DGCL”). This summary does not purport to be complete and is qualified in its entirety by the provisions of our amended and restated certificate of incorporation and amended and restated bylaws, copies of which have been filed as exhibits to the registration statement of which this prospectus is a part and the applicable provisions of the DGCL.

We are a Delaware corporation. Our authorized capital stock consists of 1,000,000,000 shares of common stock, par value $0.0001 per share, and 100,000,000 shares of preferred stock, par value $0.0001 per share.

COMMON STOCK

As of December 31, 2021, we had issued and outstanding 87,107,419 shares of common stock and no outstanding shares of preferred stock.

Dividend Rights

Subject to preferences that may apply to any shares of preferred stock outstanding at the time, if any, the holders of our common stock are entitled to receive dividends out of funds legally available if our board of directors, in its discretion, determines to issue dividends and then only at the times and in the amounts that our board of directors may determine.

Voting Rights

Holders of shares of our common stock shall be entitled to cast one vote for each share held on all matters submitted to a vote of our stockholders. Holders of shares of our common stock have no cumulative voting rights with respect to the election of directors. Our amended and restated certificate of incorporation establishes a classified board of directors that is divided into three classes with staggered three-year terms. Only the directors in one class will be subject to election by a plurality of votes cast at each annual meeting of our stockholders, with the directors in the other classes continuing for the remainder of their respective three-year terms.

No Preemptive or Similar Rights

Our common stock is not entitled to preemptive rights and is not subject to conversion, redemption or sinking fund provisions.

Right to Receive Liquidation Distributions

If we become subject to a liquidation, dissolution, or winding-up, the assets legally available for distribution to our stockholders would be distributable ratably among the holders of our common stock and, if any, any participating preferred stock outstanding at that time, after prior satisfaction of all outstanding debt and liabilities and the preferential rights and payment of liquidation preferences, if any, on any other series of preferred stock outstanding at that time.

TRANSFER AND WARRANT AGENT AND REGISTRARPREFERRED STOCK

Description of Undesignated Preferred Stock

We may issue shares of our preferred stock from time to time, in one or more series. Under our amended and restated certificate of incorporation, our board of directors is authorized, without action by the stockholders, to designate and issue up to an aggregate of 100,000,000 shares of preferred stock in one or more series, of which 180,000 were previously designated as Series A Convertible Preferred Stock, all of which shares have been fully redeemed by the Company and are no longer outstanding. Our board of directors can fix by resolution or resolutions the designations, powers, preferences and rights, and the qualifications, limitations or restrictions thereof, of any wholly unissued series of preferred stock, including without limitation authority to fix by resolution or resolutions the dividend rights, dividend rate, conversion rights, voting rights, rights and terms of redemption (including sinking fund provisions), redemption price or prices, and liquidation preferences of any such series, and the number of shares constituting any such series and the designation thereof, or any of the foregoing. Our board of directors may authorize the issuance of preferred stock with voting or conversion rights that could adversely affect the voting power or other rights of the holders of common stock. The issuance of preferred stock, while providing flexibility in connection with possible future financings and acquisitions and other corporate purposes could, under certain circumstances, have the effect of delaying or preventing a change in control of our company and might harm the market price of our common stock.

Our board of directors will make any determination to issue such shares based on its judgment as to our best interests and the best interests of our stockholders.

If we issue preferred stock pursuant to this prospectus, we will fix the rights, preferences, privileges, qualifications and restrictions of each series of such preferred stock in the certificate of designations relating to that series. If we issue preferred stock pursuant to this prospectus, we will incorporate by reference into the registration statement of which this prospectus is a part the form of any certificate of designations that describes the terms of the series of preferred stock we are offering before the issuance of the related series of preferred stock. We urge you to read the applicable prospectus supplement related to any series of preferred stock we may offer, as well as the complete certificate of designations that contains the terms of the applicable series of preferred stock.

WARRANTS

Outstanding Warrants

As of the date of this prospectus, there are outstanding warrants exercisable for an aggregate of 18,127,924 shares of our common stock, including warrants exercisable for 3,440,424 shares of our common stock at $5.64 per share and warrants exercisable for an aggregate of 14,687,500 shares of our common stock at $11.50 per share.

All of our outstanding warrants are currently exercisable. The exercise price and number of shares issuable upon exercise of the warrants may be adjusted in certain circumstances including in the event of a stock dividend, recapitalization, reorganization, merger or consolidation. A summary of the terms of outstanding warrants and the number of shares of our common stock issuable upon exercise, is presented below (in thousands, except per share amounts):

Description of Warrants

The following description of the warrant agreements summarizes certain general terms that will apply to the warrants that we may issue and not the warrants of the Company that are currently outstanding. The description is not complete, and we refer you to the warrant agreements, which will be filed with the SEC in connection with our offering of any warrants and will be available as described below under the heading “Where You Can Find Additional Information” in this prospectus, as well as the descriptions of any such warrants contained in an applicable prospectus supplement.

We may issue warrants to purchase common stock, preferred stock or other securities. We will issue warrants under one or more warrant agreements between us and a warrant agent that we will name in the applicable prospectus supplement. The prospectus supplement relating to any warrants we are offering will include specific terms relating to the offering, including a description of any other securities sold together with the warrants. These terms will include some or all of the following:

Holders of warrants will not be entitled to:

Each warrant that we may issue will entitle its holder to purchase the principal amount of the number of shares of preferred stock or common stock at the exercise price set forth in, or calculable as set forth in, the applicable prospectus supplement. Unless we otherwise specify in the applicable prospectus supplement, holders of the warrants may exercise the warrants at any time up to the specified time on the expiration date that we set forth in the applicable prospectus supplement. After the close of business on the expiration date, unexercised warrants will become void.

A holder of warrant certificates may exchange them for new warrant certificates of different denominations, present them for registration of transfer and exercise them at the corporate trust office of the warrant agent foror any other office indicated in the applicable prospectus supplement. Until any warrants to purchase common stock or preferred stock are exercised, the holders of the warrants will not have any rights of holders of the underlying common stock, preferred stock or other security.

PUBLIC UNITS

Outstanding Public Units

Each public unit consists of one share of common stock and one-half of one Public Warrant. Each whole Public Warrant entitles the holder thereof to purchase one share of our common stock at a price of $11.50 per share.

As of December 31, 2021, 3,841 public units were outstanding. Holders of public units must elect to separate the underlying shares of our common stock and Public Warrants prior to exercising their Public Warrants. If holders hold their public units in an account at a brokerage firm or bank, holders must notify their broker or bank that they elect to separate the public units into the underlying shares of common stock and Public Warrants, or if a holder holds public units registered in its own name, the warrant agent for our public warrants isholder must contact Continental Stock Transfer & Trust Company, which is located at 1 State Street Plaza, 30th Floor, New York, New York 10004, e-mail: cstmail@continentalstock.com.our transfer agent, directly and instruct them to do so.

EXCHANGE LISTINGRights as a Stockholder

Our common stock is listed on Nasdaq under the symbol “RMNI.” Our public warrants are quoted on the OTC Pink Current Information Marketplace (“OTC Pink”) under the symbol “RMNIW” andHolders of our public units are quotedentitled to cast one vote for each underlying share of our common stock held on all matters submitted to a vote of our stockholders and otherwise have the same rights and privileges as the holders of our common stock. No additional rights are conferred on the OTC Pink under the symbol “RMNIU”.

REGISTRATION RIGHTS

Investors’ Rights Agreement

Certainholders of our selling securityholders are entitled to rights with respect to the registration of their shares under the Securities Act. These registration rights are contained in RSI’s amended and restated investors’ rights agreement (the “IRA”) dated as of October 31, 2016. The registration rights set forth in the IRA expire upon the earlier of five years following the completion of an initial public offering of RSI, or, with respect to any particular stockholder, when such stockholder is able to sell all of its shares entitled to registration rights pursuant to Rule 144units by virtue of the Securities Act duringone-half of one Public Warrant underlying the public units, including any 90-day period.voting rights, until the holder exercises the Public Warrant.

ANTI-TAKEOVER EFFECTS OF DELAWARE LAW AND OUR AMENDED AND RESTATED CERTIFICATE OF INCORPORATION AND BYLAWS

Our amended and restated certificate of incorporation and amended and restated bylaws contain provisions that could have the effect of delaying, deferring, or discouraging another party from acquiring control of us. These provisions and certain provisions of the DGCL, which are summarized below, could discourage takeovers, coercive or otherwise. These provisions are also designed, in part, to encourage persons seeking to acquire control of us to negotiate first with our board of directors. We believe that the benefits of increased protection of our potential ability to negotiate with an unfriendly or unsolicited acquirer outweigh the disadvantages of discouraging a proposal to acquire us.

Undesignated Preferred Stock.Stock Our. As discussed above under “Preferred Stock,” our board of directors has the ability to designate and issue preferred stock with voting or other rights or preferences that could deter hostile takeovers or delay changes in our control or management.

Limits on Ability of Stockholders to Act by Written Consent or Call a Special Meeting. Our amended and restated certificate of incorporation provides that our stockholders may not act by written consent. This limit on the ability of stockholders to act by written consent may lengthen the amount of time required to take stockholder actions. As a result, the holders of a majority of our capital stock are not able to amend the amended and restated bylaws or remove directors without holding a meeting of stockholders called in accordance with the amended and restated bylaws.

In addition, our amended and restated bylaws provide that special meetings of the stockholders may be called only by our board of directors, the chairperson of our board of directors, our chief executive officer or our president. A stockholder may not call a special meeting, which may delay the ability of our stockholders to force consideration of a proposal or for holders controlling a majority of our capital stock to take any action, including the removal of directors.

Requirements for Advance Notification of Stockholder Nominations and Proposals. Our amended and restated bylaws contain advance notice procedures with respect to stockholder proposals and the nomination of candidates for election as directors, other than nominations made by or at the direction of our board of directors or a committee of the board of directors. These advance notice procedures may have the effect of precluding the conduct of certain business at a meeting if the proper procedures are not followed and may also discourage or deter a potential acquirer from conducting a solicitation of proxies to elect its own slate of directors or otherwise attempt to obtain control of our company.

Board Classification. Our board of directors is divided into three classes. The directors in each class serve for a three-year term, one class being elected each year by our stockholders. This system of electing and removing directors may discourage a third party from making a tender offer or otherwise attempting to obtain control of us, because it generally makes it more difficult for stockholders to replace a majority of the directors.

Choice of Forum. Our amended and restated bylaws provide that unless we consent in writing to the selection of an alternative forum, the Court of Chancery of the State of Delaware will be the exclusive forum for: (a) any derivative action or proceeding brought on our behalf; (b) any action asserting a breach of a fiduciary duty owed by any of our directors, officers, employees or agents to us or our stockholders; (c) any action asserting a claim pursuant to any provision of the DGCL, our amended and restated certificate of incorporation or our amended and restated bylaws; or (d) any action asserting a claim governed by the internal affairs doctrine. Such exclusive forum provision does not apply to suits brought to enforce any liability or duty created by the Securities Act or the Exchange Act.

Delaware Anti-Takeover Statute. We are subject to the provisions of Section 203 of the DGCL regulating corporate takeovers. In general, Section 203 prohibits a publicly held Delaware corporation from engaging, under certain circumstances, in a “business combination” with an “interested stockholder” (in each case as defined below) for a period of three years following the date the person became an interested stockholder unless:

Generally, a business combination includes a merger, asset or stock sale, or other transaction resulting in a financial benefit to the interested stockholder. An interested stockholder is a person who, together with affiliates and associates, owns or, within three years prior to the determination of interested stockholder status, owned 15% or more of a corporation’s outstanding voting stock. We expect the existence of this provision to have an anti-takeover effect with respect to transactions our board of directors does not approve in advance. We also anticipate that Section 203 may discourage attempts that might result in a premium over the market price for the shares of Common Stockcommon stock held by stockholders.

The provisions of the DGCL and the provisions of our amended and restated certificate of incorporation and amended and restated bylaws could have the effect of discouraging others from attempting hostile takeovers and as a consequence, they might also inhibit temporary fluctuations in the market price of our Common Stockcommon stock that often result from actual or rumored hostile takeover attempts. These provisions might also have the effect of preventing changes in our management. It is also possible that these provisions could make it more difficult to accomplish transactions that stockholders might otherwise deem to be in their best interests.

TRANSFER AND WARRANT AGENT AND REGISTRAR

The transfer agent for our common stock and public units and the warrant agent for our public warrants is Continental Stock Transfer & Trust Company, which is located at 1 State Street Plaza, 30th Floor, New York, New York 10004, e-mail: cstmail@continentalstock.com.

EXCHANGE LISTING

Our common stock is listed on Nasdaq under the symbol “RMNI.” Our public warrants are quoted on the OTC Pink Current Information Marketplace (“OTC Pink”) under the symbol “RMNIW” and our public units are quoted on the OTC Pink under the symbol “RMNIU.”

PLAN OF DISTRIBUTION

We are registering common stock, preferred stock and warrants with an aggregate offering price not to exceed $200,000,000, to be sold by us under a “shelf” registration process.

If we offer securities under this prospectus, we will amend or supplement this prospectus by means of an accompanying prospectus supplement setting forth the Securitiesspecific terms and conditions and other information about that offering as is required or necessary.

We may sell the securities in any of the following ways (or in any combination) from time to time:

The applicable prospectus supplement will set forth the terms of the offering of such securities, including:

We may effect the distribution of the securities from time to time in one or more transactions either:

Offers to purchase securities may be solicited directly by us and the sale thereof may be made by us directly to institutional investors or others. In such a case, no underwriters or agents would be involved. We may use electronic media, including the Internet, to sell offered securities directly.

If underwriters are used in the sale of any securities, the securities will be acquired by the underwriters for their own account and may be resold from time to time in one or more transactions, including negotiated transactions, at a fixed public offering price or at varying prices determined at the time of sale. The securities may be either offered to the public through underwriting syndicates represented by managing underwriters, or directly by underwriters. Generally, the underwriters’ obligations to purchase the securities will be subject to certain conditions precedent. Depending on the type of offering, the underwriters may be obligated to purchase all of the securities if they purchase any of the securities (other than any securities purchased upon exercise of any over-allotment option). The underwriters may receive compensation from us, for whom they may act as agents, in the form of discounts, concessions or commissions. Underwriters may sell our common stock to or through dealers, and the dealers may receive compensation in the form of discounts, concessions or commissions from the underwriters and/or commissions from the purchasers for whom they may act as agents. Such compensation may be in excess of customary discounts, concessions or commissions.

We may offer the securities covered by this prospectus into an existing trading market on the terms described in the prospectus supplement relating thereto. Underwriters, dealers and agents who participate in any at-the-market offerings will be described in the prospectus supplement relating thereto. To the extent that we make sales through one or more underwriters or agents in at-the-market offerings, we will do so pursuant to the terms of a sales agency financing agreement or other at-the-market offering arrangement between us and the underwriters or agents. If we engage in at-the-market sales pursuant to any such agreement, we will issue and sell the securities through one or more underwriters or agents, which may act on an agency basis or on a principal basis. During the term of any such agreement, we may sell our securities on a daily basis in exchange transactions or otherwise as we agree with the underwriters or agents. The agreement will provide that any securities sold will be sold at prices related to the then-prevailing market prices for our securities. Therefore, exact figures regarding proceeds that will be raised or commissions to be paid cannot be determined at this time. Pursuant to the terms of the agreement, we also may agree to sell, and the relevant underwriters or agents may agree to solicit offers to purchase, blocks of our securities. The terms of each such agreement will be set forth in more detail in the applicable prospectus supplement.

We may sell the securities through agents from time to time. The prospectus supplement will name any agent involved in the offer or sale of the securities and any commissions paid to them. Generally, any agent will be acting on a best efforts basis for the period of its appointment.

If we utilize a dealer in the sale of the securities in respect of which this prospectus is delivered, we may sell such securities to the dealer, as principal. The dealer may then resell such securities to the public at varying prices to be determined by the dealer at the time of resale.

In effecting sales, broker-dealers or agents engaged by us may arrange for other broker-dealers to participate. Broker-dealers or agents may receive commissions, discounts, or concessions from us in amounts to be negotiated immediately prior to the sale. Such compensation may be in excess of customary discounts, concessions or commissions.

In connection with the sale of the securities or otherwise, we may enter into hedging transactions with broker-dealers, which may in turn engage in short sales of the securities covered by this prospectus in the course of hedging the positions they assume. We may also sell short the securities covered by this prospectus and deliver the securities to close out short positions, or loan or pledge the securities covered by this prospectus to permitbroker-dealers that in turn may sell these securities. We may enter into option or other transactions with broker-dealers that involve the selling securityholders to conduct public secondary trading of these Securities from time to time after the date of this prospectus. We will not receive anydelivery of the proceeds of the sale of the Securitiesshares offered by this prospectus. See the section titled “Use of Proceeds.” The aggregate proceedshereby to the selling securityholders from the sale of the Securities will be the purchase price of the Securities less any discounts and commissions. We will not pay any brokers’broker-dealers, who may then resell or underwriters’ discounts and commissions in connection with the registration and sale of the Securities covered by this prospectus. The selling securityholders reserve the right to accept and, together with their respective agents, to reject, any proposed purchases of Securities to be made directly or through agents.otherwise transfer those securities.

The Securities offered by this prospectus may be sold from time to time to purchasers:

Any underwriters, broker-dealersunderwriter, broker-dealer, or agents who participateagent that participates in the sale or distribution of the Securitiessecurities may be deemed to be “underwriters” within the meaning ofan “underwriter” as defined in the Securities Act. As a result,Any commissions paid or any discounts commissions or concessions received byallowed to any such broker-dealer or agents who are deemed to be underwriters willpersons, and any profits they receive on resale of the securities, may be deemed to be underwriting discounts and commissions under the Securities Act. Underwriters are subjectWe will identify any underwriters or agents and describe their compensation in a prospectus supplement. Any compensation paid to underwriters, dealers or agents in connection with the prospectus delivery requirementsoffering of the Securities Actsecurities, and any discounts, concessions or commissions allowed by underwriters to participating dealers will be provided in the applicable prospectus supplement.

The aggregate proceeds to us from the sale of the any securities will be the purchase price of such securities less discounts and commissions, if any.

Underwriters or agents may purchase and sell the securities in the open market. These transactions may include over-allotment, stabilizing transactions, syndicate covering transactions and penalty bids. Over-allotment involves sales in excess of the offering size, which creates a short position. Stabilizing transactions consist of bids or purchases for the purpose of preventing or retarding a decline in the market price of the securities and are permitted so long as the stabilizing bids do not exceed a specified maximum. Syndicate covering transactions involve the placing of any bid on behalf of the underwriting syndicate or the effecting of any purchase to reduce a short position created in connection with the offering. The underwriters or agents also may impose a penalty bid, which permits them to reclaim selling concessions allowed to syndicate members or certain dealers if they repurchase the securities in stabilizing or covering transactions. These activities may stabilize, maintain or otherwise affect the market price of the securities, which may be subjecthigher than the price that might otherwise prevail in the open market. These activities, if begun, may be discontinued at any time. These transactions may be effected on any exchange on which the securities is traded, in the over-the-counter market or otherwise.

Agents, broker-dealers and underwriters may be entitled to indemnification by us, against certain statutorycivil liabilities, including liabilities under the Securities Act, or to contribution with respect to payments which the agents or underwriters may be required to make in respect thereof.

Agents, broker-dealers and underwriters or their affiliates may engage in transactions with, or perform services for us in the ordinary course of business. We may also use underwriters or other third parties with whom we have a material relationship. We will describe the nature of any such relationship in the applicable prospectus supplement.

We are subject to the applicable provisions of the Exchange Act of 1934, as amended (“Exchange Act”). We will make copies of this prospectus available to the selling securityholders for the purpose of satisfying the prospectus delivery requirements of the Securities Act. To our knowledge, there are currently no plans, arrangements or understandings between the selling securityholders and any underwriter, broker-dealer or agent regarding the sale of the Securities by the selling securityholders.

The Securities may be sold in one or more transactions at:

These sales may be effected in one or more transactions:

These transactions may include block transactions or crosses. Crosses are transactions in which the same broker acts as an agent on both sides of the trade.

At the time a particular offering of the Securities is made, a prospectus supplement, if required, will be distributed, which will set forth the name of the selling securityholders, the aggregate amount of Securities being offered and the terms of the offering, including, to the extent required, (1) the name or names of any underwriters, broker-dealers or agents, (2) any discounts, commissionsrules and other terms constituting compensation from the selling securityholders and (3) any discounts, commissions or concessions allowed or reallowed to be paid to broker-dealers. We may suspend the sale of Securities by the selling securityholders pursuant to this prospectus for certain periods of time for certain reasons, including if the prospectus is required to be supplemented or amended to include additional material information.

The selling securityholders will act independently of us in making decisions with respect to the timing, manner, and size of each resale or other transfer. There can be no assurance that the selling securityholders will sell any or all of the Securitiesregulations under this prospectus. Further, we cannot assure you that the selling securityholders will not transfer, distribute, devise or gift the Securities by other means not described in this prospectus. In addition, any Securities covered by this prospectus that qualify for sale under Rule 144 of the Securities Act may be sold under Rule 144 rather than under this prospectus. The Securities may be sold in some states only through registered or licensed brokers or dealers. In addition, in some states the Securities may not be sold unless they have been registered or qualified for sale or an exemption from registration or qualification is available and complied with.

The selling securityholders and any other person participating in the sale of the Securities will be subject to the Exchange Act. The Exchange Act, rules include, without limitation,including Regulation M, which may limit the timing of purchases and sales of any of the Securities bysecurities offered in this prospectus. The anti-manipulation rules under the selling securityholdersExchange Act may apply to sales of securities in the market and any other person.to the actions of the Company and our affiliates.

In order to comply with the securities laws of certain states, if applicable, the securities must be sold in such jurisdictions only through registered or licensed brokers or dealers. In addition, Regulation Min certain states the securities may restrict the ability of any person engagednot be sold unless it has been registered or qualified for sale in the distribution ofapplicable state or an exemption from the Securities to engage in market-making activities with respect to the particular Securities being distributed. This may affect the marketability of the Securitiesregistration or qualification requirement is available and the ability of any person or entity to engage in market-making activities with respect to the Securities.is complied with.

With respectTo the extent required, this prospectus may be amended and/or supplemented from time to those Securities being registered pursuanttime to the IRA for the applicable securityholders described elsewhere indescribe a specific plan of distribution. Instead of selling securities under this prospectus, we have agreedmay sell the securities offered pursuant to indemnify or provide contribution toother available exemptions from the selling securityholders and allregistration requirements of their officers, directors, partners, shareholders and representatives, as applicable, and certain underwriters effecting sales of the Securities against certain liabilities, including certain liabilities under the Securities Act. Such selling securityholders have agreed to indemnify us in certain circumstances against certain liabilities, including certain liabilities under the Securities Act. The selling securityholders may indemnify any broker or underwriter that participates in transactions involving the sale of the Securities against certain liabilities, including liabilities arising under the Securities Act.

For additional information regarding expenses of registration, see the section titled “Use of Proceeds.”

LEGAL MATTERS

The validity of the Securitiessecurities offered hereby is beinghas been passed upon for us by Baker & McKenzie LLP, Palo Alto, California. Additional legal matters may be passed upon for us or any underwriters, dealers or agents, by counsel that we will name in the applicable prospectus supplement.

EXPERTS

The consolidated financial statements of Rimini Street, Inc. as of December 31, 2021 and 2020, and for each of the years in the three-year period ended December 31, 2021, and management’s assessment of the effectiveness of internal control over financial reporting as of December 31, 2021, have been incorporated by reference herein in reliance upon the report of KPMG LLP, independent registered public accounting firm, incorporated by reference herein, and upon the authority of said firm as experts in accounting and auditing.

WHERE YOU CAN FIND ADDITIONAL INFORMATION

The rules and regulations of the SEC allow us to omit from this prospectus certain information included in the registration statement. For further information about us and the Securities, you should refer to the registration statement and the exhibits and schedules filed with the registration statement. With respect to the statements contained in this prospectus regarding the contents of any agreement or any other document, in each instance, the statement is qualified in all respects by the complete text of the agreement or document, a copy of which has been filed as an exhibit to the registration statement.

We are subject to the informational reporting requirements of the Exchange Act. We file reports, proxy statements and other information with the SEC under the Exchange Act. Our SEC filings are available over the Internet at the SEC’s website at http://www.sec.gov. Our website address is www.riministreet.com. The information on, or that can be accessed through, our website is not part of this prospectus.

INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

The SEC allows us to incorporate by reference the information and reports we file with it, which means that we can disclose important information to you by referring you to these documents. The information incorporated by reference is an important part of this prospectus, and information that we file after the date hereof with the SEC will automatically update and supersede the information already incorporated by reference. We are incorporating by reference the documents listed below, which we have already filed with the SEC, and any future filings we make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act, except as to any portion of any future report or document that is not deemed filed under such provisions, after the date of this prospectus and prior to the termination of this offering:

Upon request, we will provide, without charge, to each person, including any beneficial owner, to whom a copy of this prospectus is delivered a copy of the documents incorporated by reference into this prospectus. You may request a copy of these filings, and any exhibits we have specifically incorporated by reference as an exhibit in this prospectus, at no cost by writing or telephoning us at the following:

Rimini Street, Inc.

3993 Howard Hughes Parkway, Suite 500

Las Vegas, NV 89169

telephone number (702) 839-9671

You may also access these documents, free of charge on the SEC’s website at www.sec.gov or on our website at www.investors.riministreet.com. Information contained on our website is not incorporated by reference into this prospectus, and you should not consider any information on, or that can be accessed from, our website as part of this prospectus or any accompanying prospectus supplement.

This prospectus is part of a registration statement we filed with the SEC. We have incorporated exhibits into this registration statement. You should read the exhibits carefully for provisions that may be important to you.

We have not authorized anyone to provide you with information other than what is incorporated by reference or provided in this prospectus or any prospectus supplement. We are not making an offer of these securities in any state where such offer is not permitted. You should not assume that the information in this prospectus or in the documents incorporated by reference is accurate as of any date other than the date on the front of this prospectus or those documents.

PART II

INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

The following table sets forth all expenses to be paid by the Registrant, other than underwriting discounts and commissions, in connection with this offering. All amounts shown are estimates.

*These fees and expenses depend on the manner of sale of the securities, the securities offered and the number of issuances, and accordingly cannot be estimated at this time and will be reflected in the applicable prospectus supplement

ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

As permitted by Section 102 of the Delaware General Corporation Law, we have adopted provisions in our amended and restated certificate of incorporation and amended and restated bylaws that limit or eliminate the personal liability of our directors for a breach of their fiduciary duty of care as a director. The duty of care generally requires that, when acting on behalf of the corporation, directors exercise an informed business judgment based on all material information reasonably available to them. Consequently, a director will not be personally liable to us or our stockholders for monetary damages for breach of fiduciary duty as a director, except for liability for:

These limitations of liability do not affect the availability of equitable remedies such as injunctive relief or rescission. Our amended and restated certificate of incorporation also authorizes us to indemnify our officers, directors and other agents to the fullest extent permitted under Delaware law.

As permitted by Section 145 of the Delaware General Corporation Law, our amended and restated bylaws provide that:

Our amended and restated certificate of incorporation and our amended and restated bylaws provide for the indemnification provisions described above and elsewhere herein. We have entered into separate indemnification agreements with our directors and officers that may be broader than the specific indemnification provisions contained in the Delaware General Corporation Law. These indemnification agreements generally require us, among other things, to indemnify our directors and officers against liabilities that may arise by reason of their status or service as directors or officers, other than liabilities arising from willful misconduct. These indemnification agreements also generally require us to advance any expenses incurred by the directors or officers as a result of any proceeding against them as to which they could be indemnified. In addition, we have purchased a policy of directors’ and officers’ liability insurance that insures our directors and officers against the cost of defense, settlement or payment of a judgment in some circumstances. These indemnification provisions and the indemnification agreements may be sufficiently broad to permit indemnification of directors and officers for liabilities, including reimbursement of expenses incurred, arising under the Securities Act of 1933, as amended, or the Securities Act.

ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

EXHIBIT INDEX

+ To be filed by amendment.

** Filed herewith.

ITEM 17. UNDERTAKINGS.

provided, however, that paragraphs (a)(1)(i), (a)(1)(ii) and (a)(1)(iii) of this section do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the SEC by the Registrant pursuant to Section 13 or Section 15(d) of the Exchange Act that are incorporated by reference in the Registration Statement, or is contained in a form of prospectus filed pursuant to Rule 424(b) that is part of the registration statement.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Las Vegas, State of Nevada, on March 2, 2022.

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints Seth A. Ravin and Michael L. Perica, and each of them, as his or her true and lawful attorney-in-fact and agent with full power of substitution, for him or her in any and all capacities, to sign any and all amendments to this registration statement (including post-effective amendments or any abbreviated registration statement and any amendments thereto filed pursuant to Rule 462(b) under the Securities Act of 1933 increasing the number of securities for which registration is sought), and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorney-in-fact, proxy and agent full power and authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully for all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorney-in-fact, proxy and agent, or his or her substitute, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, as amended, this registration statement on Form S-3 has been signed by the following persons in the capacities and on the dates indicated: