Filed Pursuant to Rule 424(b)(5)

File No. 333-122068

PROSPECTUS SUPPLEMENT TO THE PROSPECTUS DATED APRIL 25, 2005

4,000,000 Shares

DIGITAL RIVER, INC.

Common Stock

          This is a public offering of common stock of Digital River, Inc. All of the shares of our common stock offered by this prospectus supplement are being offered by us.

          Our common stock is traded on the Nasdaq National Market under the symbol “DRIV.” On March 22, 2006, the last reported sale price for our common stock, as reported on the Nasdaq National Market, was $44.51 per share.

          Investing in our common stock involves risks. See “Risk Factors” beginning on page S-4 of this prospectus supplement.

          The underwriter has agreed to purchase the shares of common stock from us at a price of $43.25 per share, which will result in approximately $172.7 million in net proceeds to us, after deducting our estimated offering expenses.

          The underwriter may offer the shares of common stock from time to time in one or more transactions on the Nasdaq National Market, in the over-the-counter market or through negotiated transactions at market prices or at negotiated prices.

          It is expected that delivery of the shares of common stock will be made on or about March 28, 2006.

          Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus supplement. Any representation to the contrary is a criminal offense.

Credit Suisse

The date of this prospectus supplement is March 22, 2006.

TABLE OF CONTENTS

Prospectus Supplement

Prospectus

      Digital River^tm is our registered trademark. All other trademarks or service marks appearing in this prospectus supplement are the property of their respective owners.

      You should rely only on the information contained or incorporated by reference in this prospectus supplement and the accompanying prospectus. We have not authorized any other person to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. You should assume that the information appearing in this prospectus supplement and the accompanying prospectus, as well as information that we have previously filed with the Securities and Exchange Commission and incorporated by reference, is accurate only as of the date of the applicable document. The descriptions set forth in this prospectus supplement replace and supplement, where inconsistent, the description of the general terms and provisions set forth in the accompanying prospectus.

Common stock offered by us		4,000,000 shares
Common stock outstanding after this offering		39,473,578
Use of proceeds		Our net proceeds from the sale of the shares of common stock to be offered by this prospectus supplement will be approximately $172.7 million, after deducting our estimated offering expenses. We currently intend to use the net proceeds from the sale of common stock offered by this prospectus supplement for general corporate purposes, including capital expenditures and to meet working capital needs. We may also use a portion of the net proceeds to acquire or invest in businesses, products and technologies that are complementary to our own.
Nasdaq National Market symbol		DRIV

	•	555,748 shares of common stock held by us as treasury shares;
	•	4,401,843 shares of common stock issuable upon exercise of options outstanding as of March 21, 2006, at a weighted average exercise price of $17.76 per share;
	•	2,238,825 shares of common stock reserved for future issuance under our equity incentive plans as of March 21, 2006; and
	•	4,425,486 shares of common stock reserved for issuance upon conversion of our 1.25% Convertible Senior Notes due 2024.

RISK FACTORS

      You should carefully consider the following risk factors and other information included or incorporated by reference in this prospectus supplement and the accompanying prospectus before you decide to buy our common stock.

We have a limited profitable operating history.

      Our limited profitable operating history, which we first achieved in the quarter ended September 30, 2002, makes it difficult to evaluate our ability to sustain profitability in the future. The success of our business model depends upon our success in generating sufficient transaction and service fees from the use of our e-commerce solutions by existing and future clients. Accordingly, we must maintain our existing relationships and develop new relationships with software publishers, online retailers and physical goods clients. To achieve this goal, we intend to continue to expend significant financial and management resources on the development of additional services, sales and marketing, improved technology and expanded operations. If we are unable to maintain existing, and develop new, client relationships, we will not generate a profitable return on our investments and we will be unable to gain meaningful market share to justify those investments. Further, we may be unable to sustain profitability if our revenues decrease or increase at a slower rate than expected, or if operating expenses exceed our expectations and cannot be adjusted to compensate for lower than expected revenues.

A loss of any client that accounts for a large portion of our revenue would cause our revenue to decline.

      Sales of products for one software publisher client, Symantec Corporation, accounted for approximately 29.7% of our revenue in 2005. In addition, in 2005, revenues derived from proprietary Digital River services sold to Symantec end-users and dealer network sales of Symantec products together amounted to approximately $31.8 million, or approximately 14.4% of total Digital River revenue. In addition, a limited number of other software and physical goods clients contribute a large portion of our annual revenue. Contracts with our clients are generally one or two years in length. If any one of these key contracts is not renewed or otherwise terminates, or if revenues from these clients decline for any other reason (such as competitive developments), our revenue would decline and our ability to sustain profitability would be impaired. If our contract with Symantec is not renewed or otherwise terminated, or if revenues from Symantec and Symantec-related services decline for any other reason, our revenue and our ability to sustain profitability could be materially adversely impaired. It is important to our ongoing success that we maintain our key client relationships and, at the same time, develop new client relationships.

Failure to properly manage and sustain our expansion efforts could strain our management and other resources.

      Through acquisitions and organic growth, we are rapidly and significantly expanding our operations, both domestically and internationally. We will continue to expand further to pursue growth of our service offerings and customer base. This expansion increases the complexity of our business and places a significant strain on our management, operations, technical performance, financial resources, and internal financial control and reporting functions, and there can be no assurance that we will be able to manage it effectively. Our personnel, systems, procedures and controls may not be adequate to effectively manage our future operations, especially as we employ personnel in multiple domestic and international locations. We may not be able to hire, train, retain and manage the personnel required to address our growth. Failure to effectively manage our growth opportunities could damage our reputation, limit our future growth, negatively affect our operating results and harm our business.

We intend to continue to expand our international operations and these efforts may not be successful in generating additional revenue.

      We sell products and services to end-users outside the United States and we intend to continue expanding our international presence. In 2005, our international revenues represented approximately 39% of our total revenues. Expansion into international markets, particularly the European and Asia-Pacific regions, requires significant resources that we may fail to recover by generating additional revenue. Conducting business outside of the United States is subject to risks, including:

      These risks have grown with the acquisitions of element 5 and SWReg, which have substantial operations outside the U.S., and with our expansion into the Asia-Pacific region.

      We may be unable to successfully and cost-effectively market, sell and distribute our services in foreign markets. This may be more difficult or take longer than anticipated especially due to international challenges, such as language barriers, currency exchange issues and the fact that the Internet infrastructure in foreign countries may be less advanced than the U.S. Internet infrastructure. If we are unable to successfully expand our international operations, or manage this expansion, our operating results and financial condition could be harmed.

Our operating results are subject to fluctuations in demand for products and services offered by us or our clients.

      Our quarterly and annual operating results are subject to fluctuations in demand for the products or services offered by us or our clients, such as anti-virus software and anti-spyware software. In particular, sales of anti-virus software represented a significant portion of our revenues in recent years, and continue to be very important to our business. Demand for anti-virus software is subject to the unpredictable introduction of significant computer viruses. In February 2006, Microsoft Corporation announced plans to introduce products to protect businesses and consumers from computer viruses and other security risks. To the extent that Microsoft or others successfully introduce products or services not sold through our platform that are competitive with products and services sold by current Digital River clients (including anti-virus products and services), our revenues could be materially adversely affected.

New obligations to collect or pay transaction taxes could substantially increase the cost to us of doing business.

      Currently, we collect sales, use, value added tax (VAT) or other similar transaction taxes with respect to electronic software download and physical delivery of products in tax jurisdictions where we believe we have taxable presences. The application of transaction taxes to interstate and international sales over the Internet is complex and evolving. We already are required to collect and remit VAT in the European Union, for example. Local, state or international jurisdictions may seek to impose transaction tax collection obligations on companies like ours that engage in e-commerce, and they may seek to impose taxes retroactively on past transactions that we believed were exempt from transaction tax liability. A successful assertion by one or

more tax jurisdictions that we should collect or were obligated to collect transaction taxes on the products we sell could harm our results of operations.

We could be liable for fraudulent, improper or illegal uses of our platforms.

      In recent years revenues from our “remote control” platforms have grown as a percentage of our overall business, and we plan to continue to emphasize our self service e-commerce solutions. These platforms typically have an automated structure that allows customers to use our e-commerce services without significant participation from Digital River personnel. Despite our efforts to detect and contractually prohibit the sale of inappropriate and illegal goods and services, the remote control nature of these platforms makes it more likely that transactions involving the sale of unlawful goods or services or the violation of the proprietary rights of others may occur before we become aware of them. Furthermore, unscrupulous individuals may offer illegal products for sale via such platforms under innocuous names, further frustrating attempts to prevent inappropriate use of our services. Failure to detect inappropriate or illegal uses of our platforms by third parties could expose us to a number of risks, including fines, increased fees or termination of services by payment processors or credit card associations, risks of lawsuits, and civil and criminal penalties.

Loss of our credit card acceptance privileges would seriously hamper our ability to process the sale of merchandise.

      The payment by end-users for the purchase of digital goods that we process is typically made by credit card or similar payment method. As a result, we must rely on banks or payment processors to process transactions, and must pay a fee for this service. From time to time, credit card associations may increase the interchange fees that they charge for each transaction using one of their cards. Any such increased fees will increase our operating costs and reduce our profit margins. We also are required by our processors to comply with credit card association operating rules, and we have agreed to reimburse our processors for any fines they are assessed by credit card associations as a result of processing payments for us. The credit card associations and their member banks set and interpret the credit card rules. Visa, MasterCard, American Express, or Discover could adopt new operating rules or re-interpret existing rules that we or our processors might find difficult to follow. We have had payment processing agreements with certain of our payment processors terminated due to violations of their rules, and although we have been able to successfully migrate to new processors, such migrations require significant attention from our personnel, and often result in higher fees and customer dissatisfaction. Any disputes or problems associated with our payment processors could impair our ability to give customers the option of using credit cards to fund their payments. If we were unable to accept credit cards, our business would be seriously damaged. We also could be subject to fines or increased fees from MasterCard and Visa if we fail to detect that merchants are engaging in activities that are illegal or activities that are considered “high risk,” primarily the sale of certain types of digital content. We may be required to expend significant capital and other resources to monitor these activities.

Our failure to attract and retain software and digital products publishers, manufacturers, online retailers and online channel partners as clients would cause our revenue and operating profits to decline.

      We generate revenue by providing outsourced services to a wide variety of companies, primarily in the software and high-tech products markets. If we cannot develop and maintain satisfactory relationships with software and digital products publishers, manufacturers, online retailers and online channel partners on acceptable commercial terms, we will likely experience a decline in revenue and operating profit. We also depend on our software and digital publisher clients creating and supporting software and digital products that end-users will purchase. If we are unable to obtain sufficient quantities of software and digital products for any reason, or if the quality of service provided by these software and digital products publishers falls below a satisfactory level, we could also experience a decline in revenue, operating profit and end-user satisfaction, and our reputation could be harmed. Our contracts with our software and digital products publisher clients are generally one to two years in duration, with an automatic renewal provision for additional one-year periods,

unless we are provided with a written notice at least 90 days before the end of the contract. As is common in our industry, we have no material long-term or exclusive contracts or arrangements with any software or digital products publishers that guarantee the availability of software or digital products. Software and digital products publishers that currently supply software or digital products to us may not continue to do so and we may be unable to establish new relationships with software or digital product publishers to supplement or replace existing relationships.

Implementing our acquisition strategy could result in dilution and operating difficulties leading to a decline in revenue and operating profit.

      We have acquired, and intend to continue engaging in strategic acquisitions of businesses, technologies, services and products. For example, in April 2004, we acquired element 5, and in December 2005, we acquired Commerce5, each a provider of outsourced e-commerce solutions. The process of integrating an acquired business, technology, service or product into our business and operations may result in unforeseen operating difficulties and expenditures. Integration of an acquired business also may disrupt our ongoing business, distract management and make it difficult to maintain standards, controls and procedures. Moreover, the anticipated benefits of any acquisition may not be realized. If a significant number of clients of the acquired businesses cease doing business with us, we would experience lost revenue and operating profit, and any synergies from the acquisition may be lost. Future acquisitions could result in potentially dilutive issuances of equity securities, the incurrence of debt, contingent liabilities, amortization of intangible assets or impairment of goodwill.

We may need to raise additional capital to achieve our business objectives, which could result in dilution to existing investors or increase our debt obligations.

      We require substantial working capital to fund our business. In addition to the equity or debt securities that will remain available for issuance and sale by us after this offering under the registration statement to which this prospectus supplement relates, we have filed an acquisition shelf registration statement for up to approximately 1.5 million shares. In February 2006, we also filed a shelf registration that would allow us to sell an undetermined amount of equity or debt securities in accordance with the recently approved rules applying to “well-known seasoned issuers.” If additional funds are raised through the issuance of equity securities, the percentage ownership of our stockholders will be reduced and these equity securities may have rights, preferences or privileges senior to those of our common stock. In June 2004, we issued 1.25% convertible notes which require us to make interest payments and will require us to pay principal when the notes become due in 2024 or in the event of acceleration under certain circumstances, unless the notes are converted into our common stock prior to that. We may not have sufficient capital to service this or any future debt securities that we may issue, and the conversion of the notes into our common stock may result in further dilution to our stockholders. Our capital requirements depend on several factors, including the rate of market acceptance of our products, the ability to expand our client base, the growth of sales and marketing, and opportunities for acquisitions of other businesses. We have had significant operating losses and negative cash flow from operations since inception. Additional financing may not be available when needed, on terms favorable to us or at all. If adequate funds are not available or are not available on acceptable terms, we may be unable to develop or enhance our services, take advantage of future opportunities or respond to competitive pressures, which would harm our operating results and adversely affect our ability to sustain profitability.

Our operating results have fluctuated in the past and are likely to continue to do so, which could cause the price of our common stock to be volatile.

      Our quarterly and annual operating results have fluctuated significantly in the past and are likely to continue to do so in the future due to a variety of factors, some of which are outside our control. As a result, we believe that quarter-to-quarter and year-to-year comparisons of our revenue and operating results are not necessarily meaningful, and that these comparisons may not be accurate indicators of future performance. If our annual or quarterly operating results fail to meet the guidance we provide to securities analysts and

investors or otherwise fail to meet their expectations, the trading price of our common stock will likely decline. Some of the factors that have or may contribute to fluctuations in our quarterly and annual operating results include:

      In addition, revenue generated by our software and digital commerce services is likely to fluctuate on a seasonal basis that is typical for the software publishing market in general. We believe that our first and fourth quarters are generally seasonally stronger than our second and third quarters due to the timing of new product introductions, which generally do not occur in the summer months, the holiday selling period, and the post-holiday retail season.

      Our operating expenses are based on our expectations of future revenue. These expenses are relatively fixed in the short-term. If our revenue for a quarter falls below our expectations and we are unable to quickly reduce spending in response, our operating results for that quarter would be harmed. In addition, the operating results of companies in the electronic commerce industry have, in the past, experienced significant quarter-to-quarter fluctuations that may adversely affect our stock price.

Security breaches could hinder our ability to securely transmit confidential information.

      A significant barrier to e-commerce and communications is the secure transmission of confidential information over public networks. Any compromise or elimination of our security could be costly to remedy, damage our reputation and expose us to liability, and dissuade existing and new clients from using our services. We rely on encryption and authentication technology licensed from third parties to provide the security and authentication necessary for secure transmission of confidential information, such as end-user credit card numbers. A party who circumvents our security measures could misappropriate proprietary information or interrupt our operations.

      We may be required to expend significant capital and other resources to protect against security breaches or address problems caused by breaches. Concerns over the security of the Internet and other online transactions and the privacy of users could deter people from using the Internet to conduct transactions that involve transmitting confidential information, thereby inhibiting the growth of our business. To the extent that our activities or those of third-party contractors involve the storage and transmission of proprietary information, such as credit card numbers, security breaches could damage our reputation and expose us to a risk of loss, fines or litigation and possible liability. Our security measures may not prevent security breaches, and failure to prevent security breaches could lead to a loss of existing clients and also deter potential clients away from our services.

Claims of infringement of other parties’ intellectual property rights could require us to expend significant resources, enter into unfavorable licenses or require us to change our business plans.

      From time-to-time we are named as a defendant in lawsuits claiming that we have, in some way, violated the intellectual property rights of others. Any assertions or prosecutions of claims like these, could require us to expend significant financial and managerial resources. The defense of any claims, with or without merit, could be time-consuming, result in costly litigation and diversion of technical and management personnel, cause product enhancement delays or require that we develop non-infringing technology or enter into royalty or licensing agreements. Royalty or licensing agreements, if required, may be unavailable on terms acceptable to us or at all. In the event of a successful claim of infringement against us and our failure or inability to develop non-infringing technology or license the infringed or similar technology on a timely basis, we may be unable to pursue our current business plan. We expect that we will increasingly be subject to patent infringement claims as our services expand in scope and complexity, and our results of operation and financial condition could be materially adversely affected.

Claims against us related to the software products that we deliver electronically and the tangible goods that we deliver physically could require us to expend significant resources.

      We may become more vulnerable to third party claims as laws such as the Digital Millennium Copyright Act, the Lanham Act and the Communications Decency Act are interpreted by the courts. Claims may be made against us for negligence, copyright or trademark infringement, products liability or other theories based on the nature and content of software products or tangible goods that we deliver electronically and physically. Because we did not create these products, we are generally not in a position to know the quality or nature of the content of these products. Although we carry general liability insurance and require that our customers indemnify us against end-user claims, our insurance and indemnification measures may not cover potential claims of this type, may not adequately cover all costs incurred in defense of potential claims, or may not reimburse us for all liability that may be imposed. Any costs or imposition of liability that are not covered by insurance or indemnification measures could be expensive and time-consuming to address, distract management and delay product deliveries, even if we are ultimately successful in the defense of these claims.

The growth of the market for our services depends on the development and maintenance of the Internet infrastructure.

      Our business is based on highly reliable Internet delivery of services. The success of our business therefore depends on the development and maintenance of a sound Internet infrastructure. This includes maintenance of a reliable network backbone with the necessary speed, data capacity and security, as well as timely development of complementary products, such as routers, for providing reliable Internet access and services. Our ability to increase the speed and scope of our services is limited by, and depends upon, the speed and reliability of both the Internet and our clients’ internal networks. Consequently, as Internet usage increases, the growth of the market for our services depends upon improvements made to the Internet as well as to individual clients’ networking infrastructures to alleviate overloading and congestion. In addition, any delays in the adoption of new standards and protocols required to govern increased levels of Internet activity or increased governmental regulation may have a detrimental effect on the Internet infrastructure.

Because the e-commerce industry is highly competitive and has low barriers to entry, we may be unable to compete effectively.

      The market for e-commerce solutions is extremely competitive and we may find ourselves unable to compete effectively. Because there are relatively low barriers to entry in the e-commerce market, we expect continued intense competition as current competitors expand their product offerings and new competitors enter the market. In addition, our clients may become competitors in the future. Increased competition is likely to result in price reductions, reduced margins, longer sales cycles and a decrease or loss of our market

share, any of which could negatively impact our revenue and earnings. We face competition from the following sources:

      We believe that the principal competitive factors in our market are the breadth of products and services offered, the number of clients and online channel partnerships, brand recognition, system reliability and scalability, price, customer service, ease of use, speed to market, convenience and quality of delivery. The online channel partners and the other companies described above may compete directly with us by adopting a similar business model. Moreover, while some of these companies also are clients or potential clients of ours, they may compete with our e-commerce outsourcing solution to the extent that they develop e-commerce systems or acquire such systems from other software vendors or service providers.

      Many of our competitors have, and new potential competitors may have, more experience developing Internet-based software and e-commerce solutions, larger technical staffs, larger customer bases, more established distribution channels and customer relationships, greater brand recognition and greater financial, marketing and other resources than we have. In addition, competitors may be able to develop services that are superior to our services, achieve greater customer acceptance or have significantly improved functionality as compared to our existing and future products and services. Our competitors may be able to respond more quickly to technological developments and changes in customers’ needs. Our inability to compete successfully against current and future competitors could cause our revenue and earnings to decline.

Changes in government regulation could limit our Internet activities or result in additional costs of doing business over the Internet.

      We are subject to the same international, federal, state and local laws as other companies conducting business over the Internet. Today, there are relatively few laws specifically directed towards conducting business over the Internet. The adoption or modification of laws related to the Internet could harm our business, operating results and financial condition by increasing our costs and administrative burdens. Due to the increasing popularity and use of the Internet, many laws and regulations relating to the Internet are being debated at the international, federal and state levels. These laws and regulations could cover issues such as:

      Applicability to the Internet of existing laws governing issues, such as property ownership, copyrights and other intellectual property issues, taxation, libel, obscenity and personal privacy also could harm our operating results and substantially increase the cost to us of doing business. For example, numerous state legislatures have proposed that tax rules for Internet retailing and catalog sales correspond to enacted tax rules for sales from physical stores. Any requirement that we collect sales tax for each online purchase and remit the tax to the appropriate state authority would be a significant administrative burden to us, and would likely depress online sales. This and any other change in laws applicable to the Internet also might require significant management resources to respond appropriately. The vast majority of these laws were adopted prior to the advent of the Internet, and do not contemplate or address the unique issues raised thereby. Those laws that do reference the Internet, such as the Digital Millennium Copyright Act, are only beginning to be interpreted by the courts, and their applicability and reach are therefore uncertain.

Failure to develop our technology to accommodate increased traffic could reduce demand for our services and impair the growth of our business.

      We periodically enhance and expand our technology and transaction-processing systems, network infrastructure and other technologies to accommodate increases in the volume of traffic on our technology platforms. Any inability to add software and hardware or to develop and upgrade existing technology, transaction-processing systems or network infrastructure to manage increased traffic on this platform may cause unanticipated systems disruptions, slower response times and degradation in client services, including impaired quality and speed of order fulfillment. Failure to manage increased traffic could harm our reputation and significantly reduce demand for our services, which would impair the growth of our business. We may be unable to improve and increase the capacity of our network infrastructure sufficiently or anticipate and react to expected increases in the use of the platform to handle increased volume. Further, additional network capacity may not be available from third-party suppliers when we need it. Our network and our suppliers’ networks may be unable to maintain an acceptable data transmission capability, especially if demands on the platform increase.

      To remain competitive, we must continue to enhance and improve the responsiveness, functionality and features of our e-commerce platforms and the underlying network infrastructure. If we incur significant costs without adequate results, or are unable to adapt rapidly to technological changes, we may fail to achieve our business plan. The Internet and the e-commerce industry are characterized by rapid technological changes, changes in user and client requirements and preferences, frequent new product and service introductions embodying new technologies and the emergence of new industry standards and practices that could render our technology and systems obsolete. To be successful, we must adapt to rapid technological changes by licensing and internally developing leading technologies to enhance our existing services, developing new products, services and technologies that address the increasingly sophisticated and varied needs of our clients, and responding to technological advances and emerging industry standards and practices on a cost-effective and timely basis. The development of our proprietary technologies involves significant technical and business risks. We may fail to use new technologies effectively or fail to adapt our proprietary technology and systems to client requirements or emerging industry standards.

System failures could reduce the attractiveness of our service offerings.

      We provide commerce, marketing and delivery services to our clients and end-users through our proprietary technology transaction processing and client management systems. These systems also maintain an electronic inventory of products and gather consumer marketing information. The satisfactory performance, reliability and availability of the technology and the underlying network infrastructure are critical to our operations, level of client service, reputation and ability to attract and retain clients. We have experienced periodic interruptions, affecting all or a portion of our systems, which we believe will continue to occur from time-to-time. Any systems damage or interruption that impairs our ability to accept and fill client orders could result in an immediate loss of revenue to us, and could cause some clients to purchase services offered by our competitors. In addition, frequent systems failures could harm our reputation.

      Although we maintain system redundancies in multiple physical locations, our systems and operations are vulnerable to damage or interruption from:

      We do not carry sufficient business interruption insurance to fully compensate us for losses that may occur.

We may become liable to clients who are dissatisfied with our services.

      We design, develop, implement and manage e-commerce solutions that are crucial to the operation of our clients’ businesses. Defects in the solutions we develop could result in delayed or lost revenue, adverse end-user reaction, and/or negative publicity, which could require expensive corrections. As a result, clients who experience these adverse consequences either directly or indirectly by using our services could bring claims against us for substantial damages. Any claims asserted could exceed the level of any insurance coverage that may be available to us. The successful assertion of one or more large claims that are uninsured, that exceed insurance coverage or that result in changes to insurance policies, including future premium increases that could adversely affect our operating results or financial condition.

We depend on key personnel.

      Our future success significantly depends on the continued services and performance of our senior management. Our performance also depends on our ability to retain and motivate our key technical employees who are skilled in maintaining our proprietary technology platforms. The loss of the services of any of our executive officers or key employees could harm our business if we are unable to effectively replace that officer or employee, or if that person should decide to join a competitor or otherwise directly or indirectly compete with us. Further, we may need to incur additional operating expenses and divert other management time in order to search for a replacement.

      Our future success depends on our ability to continue to identify, attract, hire, train, retain and motivate highly skilled personnel. Competition for these personnel is intense, particularly in the Internet industry. We may be unable to successfully attract, assimilate or retain sufficiently qualified personnel. In making employment decisions, particularly in the Internet and high-technology industries, job candidates often consider the value of stock option grants they are to receive in connection with their employment. Fluctuations in our stock price may make it more difficult to retain and motivate employees. Consequently, potential employees may perceive our equity incentives as less attractive and current employees whose equity incentives are no longer attractively priced may choose not to remain with our organization. In that case, our ability to attract employees will be adversely affected. As a result, our ability to use stock options as equity incentives will be adversely affected, which will make it more difficult to compete for and attract qualified

personnel. Finally, should our stock price substantially decline, the retention value of stock options may weaken and employees who hold such options may choose not to remain with our organization.

Protecting our intellectual property is critical to our success.

      We regard the protection of our trademarks, copyrights, trade secrets and other intellectual property as critical to our success. We rely on a combination of patent, copyright, trademark, service mark and trade secret laws and contractual restrictions to protect our proprietary rights. We have entered into confidentiality and invention assignment agreements with our employees and contractors, and nondisclosure agreements with parties with whom we conduct business, in order to limit access to and disclosure of our proprietary information. These contractual arrangements and the other steps taken by us to protect our intellectual property may not prevent misappropriation of our technology or deter independent third-party development of similar technologies. We also seek to protect our proprietary position by filing U.S. patent applications related to our proprietary technology, inventions and improvements that are important to the development of our business. Proprietary rights relating to our technologies will be protected from unauthorized use by third parties only to the extent they are covered by valid and enforceable patents or are effectively maintained as trade secrets. We pursue the registration of our trademarks and service marks in the U.S. and internationally. Effective trademark, service mark, copyright and trade secret protection may not be available in every country in which our services are made available online.

      The steps we have taken to protect our proprietary rights may be inadequate and third parties may infringe or misappropriate our trade secrets, trademarks and similar proprietary rights. Any significant failure on our part to protect our intellectual property could make it easier for our competitors to offer similar services and thereby adversely affect our market opportunities. In addition, litigation may be necessary in the future to enforce our intellectual property rights, to protect our trade secrets or to determine the validity and scope of the proprietary rights of others. Litigation could result in substantial costs and diversion of management and technical resources.

Our clients’ sales cycles are lengthy, which may cause us to incur substantial expenses and expend management time without generating corresponding consumer revenue, which would impair our cash flow.

      We market our services directly to software publishers, online retailers and other prospective customers outside of the software industry. These relationships are typically complex and take time to finalize. Due to operating procedures in many organizations, a significant amount of time may pass between selection of our products and services by key decision-makers and the signing of a contract. The period between the initial client sales call and the signing of a contract with significant sales potential is difficult to predict and typically ranges from six to twelve months. If at the end of a sales effort a prospective client does not purchase our products or services, we may have incurred substantial expenses and expended management time that cannot be recovered and that will not generate corresponding revenue. As a result, our cash flow and our ability to fund expenditures incurred during the sales cycle may be impaired.

The listing of our network addresses on anti-SPAM lists could harm our ability to service our clients and deliver goods over the Internet.

      Certain privacy and anti-email proponents have engaged in a practice of gathering, and publicly listing, network addresses that they believe have been involved in sending unwanted, unsolicited emails commonly known as SPAM. In response to user complaints about SPAM, Internet service providers have from time-to-time blocked such network addresses from sending emails to their users. If our network addresses mistakenly end up on these SPAM lists, our ability to provide services for our clients and consummate the sales of digital and physical goods over the Internet could be harmed.

We are subject to regulations relating to consumer privacy.

      We collect and maintain end-user data for our clients, which subjects us to increasing international, federal and state regulations related to online privacy and the use of personal user information. Congress has enacted anti-SPAM legislation with which we must comply when providing email campaigns for our clients. Legislation and regulations are pending in various domestic and international governmental bodies that address online privacy protections. Several governments have proposed, and some have enacted, legislation that would limit the use of personal user information or require online services to establish privacy policies. In addition, the U.S. Federal Trade Commission, or FTC, has urged Congress to adopt legislation regarding the collection and use of personal identifying information obtained from individuals when accessing websites. In the past, the emphasis has been on information obtained from minors. Focus has now shifted to include online privacy protection for minors and adults.

      Even in the absence of laws requiring companies to establish these procedures, the FTC has settled several proceedings resulting in consent decrees in which Internet companies have been required to establish programs regarding the manner in which personal information is collected from users and provided to third parties. We could become a party to a similar enforcement proceeding. These regulatory and enforcement efforts could limit our collection of and/or ability to share with our clients demographic and personal information from end-users, which could adversely affect our ability to comprehensively serve our clients.

      The European Union has adopted a privacy directive that regulates the collection and use of information that identifies an individual person. These regulations may inhibit or prohibit the collection and sharing of personal information in ways that could harm our clients or us. The globalization of Internet commerce may be harmed by these and similar regulations because the European Union privacy directive prohibits transmission of personal information outside the European Union. The United States and the European Union have negotiated an agreement providing a “safe harbor” for those companies who agree to comply with the principles set forth by the U.S. Department of Commerce and agreed to by the European Union. Failure to comply with these principles may result in fines, private lawsuits and enforcement actions. These enforcement actions can include interruption or shutdown of operations relating to the collection and sharing of information pertaining to citizens of the European Union.

Compliance with future laws imposed on e-commerce may substantially increase our costs of doing business or otherwise adversely affect our ability to offer our services.

      Because our services are accessible worldwide, and we facilitate sales of products to end-users worldwide, international jurisdictions may claim that we are required to comply with their laws. Laws regulating Internet companies outside of the United States may be less favorable than those in the United States, giving greater rights to consumers, content owners and users. Compliance may be more costly or may require us to change our business practices or restrict our service offerings relative to those provided in the United States. Any failure to comply with foreign laws could subject us to penalties ranging from fines to bans on our ability to offer our services.

      As our services are available over the Internet in multiple states and foreign countries, these jurisdictions may claim that we are required to qualify to do business as a foreign corporation in each state or foreign country. We and/or our subsidiaries are qualified to do business only in certain states. Failure to qualify as a foreign corporation in a required jurisdiction could subject us to taxes and penalties and could result in our inability to enforce contracts in these jurisdictions.

      In addition, we are subject to United States laws governing the conduct of business with other countries, such as export control laws, which prohibit or restrict the export of goods, services and technology to designated countries, denied persons or denied entities from the United States. Violation of these laws could result in fines or other actions by regulatory agencies and result in increased costs of doing business and reduced profits. In addition, any significant changes in these laws, particularly an expansion in export control laws, will increase our costs of compliance and may further restrict our overseas client base.

We are exposed to foreign currency exchange risk.

      Net revenues outside the United States accounted for approximately 39% of our net revenues in 2005. The results of operations of, and certain of our intercompany balances associated with, our internationally-focused websites are exposed to foreign exchange rate fluctuations. Upon translation, net sales and other operating results from our international operations may differ materially from expectations, and we may record significant gains or losses on the remeasurement of intercompany balances. If the U.S. dollar weakens against foreign currencies, the translation of these foreign-currency-denominated transactions will result in increased net revenues and operating expenses. Similarly, our net revenues and operating expenses will decrease if the U.S. dollar strengthens against foreign currencies. As we have expanded our international operations, our exposure to exchange rate fluctuations has become more pronounced. We do not currently have a currency hedging program to mitigate the effect of fluctuations of currency prices on our financial results. See Item 7A of Part II of our Annual Report on Form 10-K (and incorporated by reference into this prospectus supplement), for information demonstrating the effect on our consolidated statements of operations from changes in exchange rates versus the U.S. dollar.

Developments in accounting standards may cause us to increase our recorded expenses, which in turn would jeopardize our ability to demonstrate sustained profitability.

      In January 2002, we adopted Statement of Financial Accounting Standard No. 142, “Goodwill and Other Intangible Assets” (SFAS No. 142). The statement generally establishes that goodwill and intangible assets with indefinite lives are not amortized, but are to be tested on an annual basis for impairment and, if impaired, are recorded as an impairment charge in income from operations. As of December 31, 2005, we had goodwill with an indefinite life of $195.3 million from our acquisitions. If our goodwill is determined for any reason to be impaired, the subsequent accounting of the impaired portion as an expense would lower our earnings and jeopardize our ability to demonstrate sustained profitability.

      In 2004, the Financial Accounting Standards Board adopted a proposal to require that the fair value of stock options and other share-based payments be reflected as an expense item in the financial statements of public companies for annual periods beginning after June 15, 2005. As a result of the adoption of this proposal, our recorded non-cash expenses will significantly increase in 2006, which could impair our ability to maintain profitability.

Compliance with changing regulation of corporate governance and public disclosure may result in additional expenses.

      Keeping abreast of, and in compliance with, changing laws, regulations and standards relating to corporate governance and public disclosure, including the Sarbanes-Oxley Act of 2002, new SEC regulations and the NASDAQ Stock Market rules, have required an increased amount of management attention and external resources. We intend to invest all reasonably necessary resources to comply with evolving corporate governance and public disclosure standards, and this investment may result in increased general and administrative expenses and a diversion of management time and attention from revenue-generating activities to compliance activities.

Internet-related stock prices are especially volatile and this volatility may depress our stock price or cause it to fluctuate significantly.

      The stock market, and the trading prices of Internet-related companies in particular, have been notably volatile. This volatility is likely to continue in the short-term and is not necessarily related to the operating performance of affected companies. This broad market and industry volatility could significantly reduce the price of our common stock at any time, without regard to our operating performance. Factors that could cause our stock price in particular to fluctuate include, but are not limited to:

      In addition, our stock price may be impacted by the short sales and actions of other parties who may disseminate misleading information about us in an effort to profit from fluctuations in our stock price.

Provisions of our charter documents, other agreements and Delaware law may inhibit potential acquisition bids for us.

      Certain provisions of our amended and restated certificate of incorporation, bylaws, other agreements and Delaware law could make it more difficult for a third party to acquire us, even if a change in control would be beneficial to our stockholders.

FORWARD-LOOKING STATEMENTS

      In addition to the historical information contained in this prospectus supplement and the accompanying prospectus, this prospectus supplement and the accompanying prospectus contain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. These statements may be identified by the use of words such as “expects,” “anticipates,” “intends,” “plans” and similar expressions. These statements involve known and unknown risks, uncertainties and other factors that may cause our actual results, performance or achievements, or industry results, to be materially different from any future results, performance or achievements, or industry results, expressed or implied by such forward-looking statements. The sections entitled “Risk Factors” beginning on page S-4 of this prospectus supplement, and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Business” in our Annual Report on Form 10-K for the year ended December 31, 2005 contain a discussion of some of the factors that could contribute to those differences.

USE OF PROCEEDS

      Our net proceeds from the sale of the shares of common stock to be offered by this prospectus supplement will be approximately $172.7 million, after deducting our estimated offering expenses.

      We currently intend to use the net proceeds from the sale of common stock offered by this prospectus supplement for general corporate purposes, including capital expenditures and to meet working capital needs. We may also use a portion of the net proceeds to acquire or invest in businesses, products and technologies that are complementary to our own. Pending such uses, we may invest the net proceeds in interest-bearing securities.

DESCRIPTION OF CAPITAL STOCK

      Our authorized capital stock consists of 60,000,000 shares of common stock, par value $0.01 per share, and 5,000,000 shares of preferred stock, par value $0.01 per share. As of March 21, 2006, there were 35,473,578 shares of our common stock issued and outstanding, and no shares of preferred stock issued or outstanding. The number of shares of common stock outstanding as of March 21, 2006 excludes:

Common Stock

      The holders of common stock are entitled to one vote for each share held of record on all matters submitted to a vote of the stockholders. Subject to preferences that may be applicable to any outstanding shares of preferred stock, the holders of common stock are entitled to receive ratably any dividends declared by the board of directors out of legally available funds. In the event of a liquidation, dissolution or winding up of our company, holders of the common stock are entitled to share ratably in all assets remaining after payment of liabilities and the liquidation preferences of any outstanding shares of preferred stock. Holders of common stock have no preemptive rights and no right to convert their common stock into any other securities. There are no redemption or sinking fund provisions applicable to the common stock. All of our outstanding shares of common stock are, and all of the shares of common stock offered by this prospectus as well as all of the shares of our common stock issuable upon the conversion of our outstanding convertible notes and upon the conversion of any preferred stock or debt securities offered pursuant to this prospectus, when issued and paid for, will be, fully paid and non-assessable.

Preferred Stock

      Pursuant to our amended and restated certificate of incorporation, our board of directors has the authority, without further action by the stockholders, to issue up to 5,000,000 shares of preferred stock in one or more series and to fix the designations, powers, preferences, privileges and relative participating, optional or special rights and the qualifications, limitations or restrictions thereof, including dividend rights, conversion rights, voting rights, terms of redemption and liquidation preferences, any or all of which may be greater than the rights of the common stock.

      The issuance of preferred stock could adversely affect the voting power of holders of our common stock, and the likelihood that holders of preferred stock will receive dividend payments and payments upon liquidation may have the effect of delaying, deferring or preventing a change in control of us, which could depress the market price of our common stock and securities convertible into our common stock.

Antitakeover Effects of Provisions of Charter Documents and Delaware Law

      Charter Documents. Our amended and restated certificate of incorporation and bylaws include a number of provisions that may have the effect of deterring hostile takeovers or delaying or preventing changes in control or management of our company. First, our certificate of incorporation provides for a “classified” board of directors in which only approximately one third of the directors are elected at each annual meeting of stockholders. Our certificate of incorporation also provides that all stockholder action must be effected at a duly called meeting of stockholders and not by a consent in writing. Further, our bylaws limit who may call special meetings of the stockholders. Our certificate of incorporation does not include a provision for cumulative voting for directors. Under cumulative voting, a minority stockholder holding a

sufficient percentage of a class of shares may be able to ensure the election of one or more directors. Finally, our bylaws establish procedures, including advance notice procedures, with regard to the nomination of candidates for election as directors and stockholder proposals. These and other provisions of our certificate of incorporation and bylaws and Delaware law could discourage potential acquisition proposals and could delay or prevent a change in control or management of our company.

      Delaware Takeover Statute. We are subject to the provisions of Section 203 of the Delaware General Corporation Law. In general, the statute prohibits a publicly held Delaware corporation from engaging in a business combination with an interested stockholder for a period of three years after the date of the transaction in which the person became an interested stockholder, unless the business combination is approved in a prescribed manner. For purposes of Section 203, a business combination includes a merger, asset sale or other transaction resulting in a financial benefit to the interested stockholder, and an interested stockholder is a person who, together with affiliates and associates, owns, or within three years prior, did own, 15% or more of the corporation’s voting stock.

      These and other provisions of our certificate and bylaws and Delaware law could discourage potential acquisition proposals and could delay or prevent a change in control or management of our company.

Transfer Agent and Registrar

      Wells Fargo Shareowner Services is the transfer agent and registrar for our common stock.

UNDERWRITING

      We have entered into an underwriting agreement with Credit Suisse Securities (USA) LLC, pursuant to which we will sell to Credit Suisse Securities (USA) LLC all of the shares of common stock offered by this prospectus supplement.

      The underwriting agreement provides that the obligation of Credit Suisse Securities (USA) LLC to purchase the shares offered hereby is subject to certain conditions and that Credit Suisse Securities (USA) LLC is obligated to purchase all of the shares of common stock offered hereby if any of the shares are purchased.

      Credit Suisse Securities (USA) LLC proposes to offer the shares of common stock from time to time for sale in one or more transactions on the Nasdaq National Market, in the over-the-counter market, through negotiated transactions or otherwise at market prices prevailing at the time of sale, at prices related to prevailing market prices or at negotiated prices, subject to receipt and acceptance by it and subject to its right to reject any order in whole or in part. In connection with the sale of the shares of common stock offered hereby, Credit Suisse Securities (USA) LLC may be deemed to have received compensation in the form of underwriting discounts. Credit Suisse Securities (USA) LLC may effect such transactions by selling shares of common stock to or through dealers, and such dealers may receive compensation in the form of discounts, concessions or commissions from Credit Suisse Securities (USA) LLC and/or purchasers of shares of common stock for whom they may act as agents or to whom they may sell as principal.

      We will bear the expenses of this offering, which are estimated to be approximately $350,000.

      We have agreed to indemnify the underwriters against liabilities under the Securities Act or to contribute to payments the underwriters may be required to make in that respect.

      We have agreed and our directors and executive officers agreed, subject to certain of our executive officers and directors being able to sell an aggregate of 360,000 shares of our common stock and certain other limited exceptions, not to, without the prior written consent of Credit Suisse Securities (USA) LLC directly or indirectly, offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase or otherwise transfer or dispose of any shares of our common stock or other capital stock or any securities convertible into or exercisable or exchangeable for our common stock or other capital stock or enter into any swap or other agreement or transaction that transfers, in whole or in part, directly or indirectly, the economic consequences of ownership of any of our common stock or other capital stock, whether any such swap or transaction described above is to be settled by delivery of our common stock or other capital stock or other securities, in cash or otherwise, for a period of 90 days after the date of this prospectus supplement, or Lockup Period; provided, however, that if (1) during the last 17 days of the initial Lockup Period, we release earnings results or material news or a material event relating to us occurs or (2) prior to the expiration of the initial Lockup Period, we announce that we will release earnings results during the 16-day period beginning on the last day of the initial Lockup Period, then in each case the Lockup Period will be extended until the expiration of the 18-day period beginning on the date of release of the earnings results or the occurrence of the material news or material event, as applicable, unless Credit Suisse Securities (USA) LLC waives, in writing, such extension, or unless any research published or distributed by Credit Suisse Securities (USA) LLC on Digital River would be compliant under Rule 139 of the Securities Act of 1933, and our securities are “actively-traded” as defined in Rule 101(c)(1) of Regulation M of the Securities Exchange Act of 1934. The foregoing will not prohibit us from issuing shares of common stock upon the exercise of any option or warrant or the conversion of a security outstanding on the date of this prospectus supplement or from issuing shares of common stock or options to purchase common stock granted pursuant to employee benefit plans existing on the date of this prospectus supplement.

      Credit Suisse Securities (USA) LLC has advised us that it may make short sales of our common stock in connection with this offering. Short sales involve the sale by Credit Suisse Securities (USA) LLC of a greater number of shares than it is required to purchase in the offer. Credit Suisse Securities (USA) LLC must close out any such short position by purchasing shares in the open market. A short position is more likely to be

created if Credit Suisse Securities (USA) LLC is concerned that there may be downward pressure on the price of the shares in the open market prior to the completion of the offering.

      Credit Suisse Securities (USA) LLC has advised us that, pursuant to Regulation M under the Securities Act, they may engage in transactions, including stabilizing bids, that may have the effect of stabilizing or maintaining the market price of the shares of our common stock at a level above that which might otherwise prevail in the open market. A “stabilizing bid” is a bid for or the purchase of shares of common stock by Credit Suisse Securities (USA) LLC for the purpose of fixing or maintaining the price of common stock. Purchases to cover short positions and stabilizing transactions may have the effect of preventing or slowing a decline in the market price of our common stock. As a result, the price of our common stock may be higher than the price that might otherwise exist in the open market. Credit Suisse Securities (USA) LLC has advised us that stabilizing bids and open market purchases may be effected on the Nasdaq National Market or otherwise and, if commenced, may be discontinued at any time.

      From time to time, Credit Suisse Securities (USA) LLC and its affiliates have provided, and may in the future provide, investment banking and other services to us for which they receive customary fees and commissions.

      A prospectus in electronic format may be made available on the web sites maintained by Credit Suisse Securities (USA) LLC and Credit Suisse Securities (USA) LLC may distribute prospectuses electronically. Credit Suisse Securities (USA) LLC may allocate a number of shares to for sale to its online brokerage account holders. Internet distributions will be allocated by Credit Suisse Securities (USA) LLC on the same basis as other allocations.

INCORPORATION BY REFERENCE

      We are a reporting company and file annual, quarterly and current reports, proxy statements and other information with the SEC. You may read and copy these reports, proxy statements and other information at the SEC’s public reference room at Room 1024, 450 Fifth Street, N.W., Washington, D.C. You can request copies of these documents by writing to the SEC and paying a fee for the copying cost. Please call the SEC at 1-800-SEC-0330 for more information about the operation of the public reference rooms. Our SEC filings are also available at the SEC’s web site at “http://www.sec.gov.” In addition, you can read and copy our SEC filings at the office of the National Association of Securities Dealers, Inc. at 1735 “K” Street, N.W., Washington, D.C. 20006.

      The SEC allows us to “incorporate by reference” information that we file with them, which means that we can disclose important information to you by referring you to those documents. The information incorporated by reference is an important part of this prospectus supplement and the accompanying prospectus, and information that we file later with the SEC will automatically update and supersede this information. We incorporate by reference the documents listed below and any future filings we will make with the SEC under Section 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934 between the date of this prospectus supplement and the termination of the offering (other than those portions of such documents that have been furnished rather than filed in accordance with the applicable rules and regulations promulgated by the SEC):

      You may access these documents at no cost through our web site at www.digitalriver.com or request a copy of these filings at no cost, by writing or telephoning us at the following address:

Digital River, Inc.

9625 W. 76th Street, Suite 150

Eden Prairie, MN 55344

(952) 253-1234

      This prospectus supplement and the accompanying prospectus is part of a registration statement we filed with the SEC. You should rely only on the information incorporated by reference or provided in this prospectus supplement, the accompanying prospectus and the registration statement filed by us in connection with this offering. We have authorized no one to provide you with different information. You should not assume that the information in this prospectus supplement is accurate as of any date other than the date on the front of the document.

LEGAL MATTERS

      The validity of the shares of common stock being offered by this prospectus supplement will be passed upon for us by Howard Rice Nemerovski Canady Falk & Rabkin, A Professional Corporation, San Francisco, California. Certain legal matters in connection with the offering will be passed upon for the underwriters by Wilson Sonsini Goodrich & Rosati, Professional Corporation, Palo Alto, California.

EXPERTS

      Ernst & Young LLP, independent registered public accounting firm, has audited our consolidated financial statements and schedule included in our Annual Report on Form 10-K for the year ended December 31, 2005, and management’s assessment of the effectiveness of our internal control over financial reporting as of December 31, 2005 as set forth in their reports, which are incorporated by reference in this prospectus and elsewhere in the registration statement. Our financial statements and schedule and management’s assessment are incorporated by reference in reliance on Ernst & Young LLP’s reports, given on their authority as experts in accounting and auditing.

PROSPECTUS

$255,165,000

Digital River, Inc.

Common Stock

Preferred Stock

Debt Securities

Warrants

        From time to time, we may sell common stock, preferred stock, debt securities and/or warrants.

      We will describe in one or more prospectus supplements the securities we are offering and selling, as well as the specific terms of the securities. You should read this prospectus and any prospectus supplements carefully before you invest. This prospectus may not be used to offer or sell any securities unless accompanied by a prospectus supplement.

      The securities may be sold directly by us to investors, through agents designated from time to time or to or through underwriters or dealers. For additional information on the methods of sale, you should refer to the section entitled “Plan of Distribution.” If any underwriters are involved in the sale of any securities with respect to which this prospectus is being delivered, the names of such underwriters and any applicable commissions or discounts will be set forth in a prospectus supplement. The net proceeds we expect to receive from such sale will also be set forth in a prospectus supplement.

      On April 25, 2005, the Securities and Exchange Commission declared effective our acquisition shelf registration statement on Form S-4 (File No. 333-122069) for the offering by us from time to time of up to 1,480,000 shares of our common stock in connection with future acquisitions of other businesses, assets or securities. In addition, on January 19, 2005, the Securities and Exchange Commission declared effective our resale shelf registration statement on Form S-3 (File No. 333-120602) for the sale from time to time by the selling securityholders named therein of up to 311,185 shares of our common stock in connection with our acquisition of BlueHornet Networks, Inc.

      See “Risk Factors” beginning on page 2 of this prospectus to read about factors you should consider before buying our common stock.

      Our common stock is quoted on the Nasdaq National Market under the symbol “DRIV.” On April 15, 2005, the last reported sale price for our common stock, as reported on the Nasdaq National Market, was $28.21 per share.

      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 April 25, 2005

TABLE OF CONTENTS

ABOUT THIS PROSPECTUS

      This prospectus is part of a registration statement that we filed with the Securities and Exchange Commission (SEC) using a “shelf” registration process. Under the shelf registration process, we may sell common stock, preferred stock, debt securities and/or warrants in one or more offerings up to a total dollar amount of $255,165,000. This prospectus provides you with a general description of the securities we may offer. Each time we sell securities, we will provide a prospectus supplement that will contain more specific information. We may also add, update or change in the prospectus supplement any of the information contained in this prospectus. This prospectus, together with applicable prospectus supplements, includes all material information relating to this offering. You should carefully read both this prospectus and any prospectus supplement together with the additional information described below under “Where You Can Find More Information.”

      You should rely only on the information contained or incorporated by reference in this prospectus or any prospectus supplement. We have not authorized anyone to provide you with information that is different. We are not making an offer of common stock in any state or jurisdiction where such an offer is not permitted. You should not assume that the information contained or incorporated by reference in this prospectus or any prospectus supplement is accurate as of any date other than the date on the front of such document.

      Digital River^tm is our registered trademark. All other trademarks or service marks appearing in this prospectus are property of their respective owners.

RISK FACTORS

      You should carefully consider the risks described below before making an investment decision. The risks described below are not the only ones facing our company. Additional risks not presently known to us or that we currently deem immaterial may also impair our business operations. Our business, financial condition or results of operations could be materially adversely affected by any of these risks. The value of our common stock could decline due to any of these risks, and you may lose all or part of your investment. This prospectus 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 faced by us described below and elsewhere in this prospectus.

Risks Related To Our Business

      We were incorporated in February 1994 and conducted our first online sale through a client’s Web store in August 1996. We have been in business for approximately 44 quarters, but have only sustained profitability for the last ten quarters through December 31, 2004, and have incurred significant losses since we were formed. As of December 31, 2004, we had an accumulated deficit of approximately $51.2 million. Our limited profitable operating history makes it difficult to evaluate our ability to sustain profitability in the future.

      The success of our business model depends upon our success in generating sufficient transaction and service fees from the use of our e-commerce solutions by existing and future clients. Accordingly, we must maintain our existing relationships and develop new relationships with software publishers, online retailers and physical goods clients. To achieve this goal, we intend to continue to expend significant financial and management resources on the development of additional services, sales and marketing, improved technology and expanded operations. If we are unable to maintain existing, and develop new, client relationships, we will not generate a profitable return on our investments and we will be unable to gain meaningful market share to justify those investments. Further, we may be unable to sustain profitability if our revenues decrease or increase at a slower rate than expected, or if operating expenses exceed our expectations and cannot be adjusted to compensate for lower than expected revenues.

      Our quarterly and annual operating results are subject to fluctuations in demand for the products or services offered by us or our clients, such as anti-virus software, anti-spyware software, and tax preparation software. In particular, sales of anti-virus software represented a significant portion of our revenues in recent years, and continue to be very important to our business. In February 2005, Microsoft Corporation announced plans to acquire Sybari Software Inc., a producer of commercial anti-virus products. Microsoft simultaneously announced plans to introduce products to protect businesses and consumers from computer viruses and other security risks. To the extent that Microsoft or others successfully introduce products or services not sold through our platform that are competitive with products and services sold by current Digital River clients (including anti-virus products and services), our revenues could be materially adversely affected. If, as a result, our annual or quarterly revenues or operating profits fail to meet the guidance we provide to securities analysts and investors, or we otherwise fail to meet their expectations, the trading price of our common stock will likely decline.

      Our quarterly and annual operating results have fluctuated significantly in the past and are likely to continue to do so in the future due to a variety of factors, some of which are outside our control. As a result,

we believe that quarter-to-quarter and year-to-year comparisons of our revenue and operating results are not necessarily meaningful, and that these comparisons may not be accurate indicators of future performance. If our annual or quarterly operating results fail to meet the guidance we provide to securities analysts and investors or otherwise fail to meet their expectations, the trading price of our common stock will likely decline. Some of the factors that have or may contribute to fluctuations in our quarterly and annual operating results include:

      In addition, revenue generated by our software and digital commerce services is likely to fluctuate on a seasonal basis that is typical for the software publishing market in general. We believe that our first and fourth quarters are generally seasonally stronger than our second and third quarters due to the timing of demand of tax preparation software, the holiday selling period and the post-holiday retail season. We also believe that software publishers avoid new product releases in the summer months.

      Our operating expenses, which include: sales & marketing, product research & development and general & administrative expenses, are based on our expectations of future revenue. These expenses are relatively fixed in the short-term. If our revenue for a quarter falls below our expectations and we are unable to quickly reduce spending in response, our operating results for that quarter would be harmed. In addition, the operating results of companies in the e-commerce industry have, in the past, experienced significant quarter-to-quarter fluctuations that may adversely affect our stock price.

      Sales of products for one software publisher client, Symantec Corporation, accounted for approximately 27% of our revenue in 2004. In addition, Digital River independently sells proprietary Digital River services directly to customers as they purchase Symantec products. These services include product recovery services provided by Digital River for which separate fees are charged to end-users. In addition, Digital River derives revenues from e-commerce retailers and dealers who sell Symantec products or related Digital River services. In 2004, revenues derived from proprietary Digital River services sold to Symantec end-users and dealer network sales of Symantec products together amounted to approximately $16.6 million, or approximately

10.8% of total Digital River revenue. In addition, a limited number of other software and physical goods clients contribute a large portion of our annual revenue. Contracts with our clients are generally one or two years in length. If any one of these key contracts is not renewed or otherwise terminates, or if revenues from these clients decline for any other reason (such as competitive developments), our revenue would decline and our ability to sustain profitability would be impaired. It is important to our ongoing success that we maintain these key client relationships and, at the same time, develop new client relationships.

      We market our services directly to software publishers, online retailers and other prospective customers outside of the software industry. These relationships are typically complex and take time to finalize. Due to operating procedures in many organizations, a significant amount of time may pass between selection of our products and services by key decision-makers and the signing of a contract. The period between the initial sales call and the signing of a contract with significant sales potential is difficult to predict and typically ranges from six to twelve months. If at the end of a sales effort a prospective client does not purchase our products or services, we may have incurred substantial expenses and expended management time that cannot be recovered and that will not generate corresponding revenue. As a result, our cash flow and our ability to fund expenditures incurred during the sales cycle may be impaired.

      The revenue growth and profitability of our business depends significantly on the overall demand for e-commerce solutions. We believe that the market for these solutions may be adversely affected by a number of factors, including reductions in capital expenditures by clients and potential weakening of the U.S. and foreign economies. The continued military responses to the 2001 terrorist attacks on the United States, the ongoing possibility of future terrorist attacks and the possibility of future armed conflicts may create adverse economic conditions and lead to weakening in the economy.

      These factors may, in turn, give rise to a number of market trends that may slow our revenue growth, including:

      We generate revenue by providing outsourced services to software and digital products publishers, manufacturers, online retailers and online channel partners. If we cannot develop and maintain satisfactory relationships with software and digital products publishers, manufacturers, online retailers and online channel partners on acceptable commercial terms, we will likely experience a decline in revenue and operating profits. We also depend on our software and digital publisher clients creating and supporting software and digital products that end-users will purchase. If we are unable to obtain sufficient quantities of software and digital products for any reason, or if the quality of service provided by these software and digital products publishers falls below a satisfactory level, we could also experience a decline in revenue, operating profit and end-user satisfaction, and our reputation could be harmed. Our contracts with our software and digital products publisher clients are generally one to two years in duration, with an automatic renewal provision for additional one-year periods, unless we are provided with a written notice at least 90 days before the end of the contract. As is common in our industry, we have no long-term or exclusive contracts or arrangements with any software or digital products publishers that guarantee the availability of software or digital products. Software and digital products publishers that currently supply software or digital products to us may not

continue to do so and we may be unable to establish new relationships with software or digital products publishers to supplement or replace existing relationships.

      We have acquired, and intend to continue engaging in strategic acquisitions of, businesses, technologies, services and products, such as businesses that provide outsourcing services to software publishers. For example, in April 2004, we acquired element 5, a provider of outsourced e-commerce solutions. The process of integrating an acquired business, technology, service or product into our business and operations may result in unforeseen operating difficulties and expenditures. Integration of an acquired business also may disrupt our ongoing business, distract management and make it difficult to maintain standards, controls and procedures. Moreover, the anticipated benefits of any acquisition may not be realized. If a significant number of clients of the acquired businesses cease doing business with us, we would experience lost revenue and operating profit, and any synergies from the acquisition may be lost. Future acquisitions could result in potentially dilutive issuances of equity securities, the incurrence of debt, contingent liabilities, amortization of intangible assets or impairment of goodwill.

      Our success will depend in large part on the continued growth in end-user acceptance of ESD as a method of distributing software products. ESD is a relatively new method of distributing software products to end-users, and unless ESD gains widespread market acceptance, we will be unable to achieve our business plan. Factors that are likely to influence the market acceptance of ESD include:

      Even if ESD achieves widespread acceptance, we may be unable to overcome the substantial existing and future technical challenges associated with electronically delivering software reliably and consistently on a long-term basis. Our failure to do so would also impair our ability to execute our business plan.

      In January 2002, we adopted Statement of Financial Accounting Standard No. 142, “Goodwill and Other Intangible Assets” (SFAS No. 142). The statement generally establishes that goodwill and intangible assets with indefinite lives are not amortized but are to be tested on an annual basis for impairment and, if impaired, are recorded as an impairment charge in income from operations. As of December 31, 2004, we had unamortized goodwill with an indefinite life of $148.1 million from our acquisitions made in 2004 and previous years. Our acquisition of element 5 for example has resulted in a significant increase in unamortized goodwill. If a portion of our unamortized goodwill is determined for any reason to be impaired, the subsequent accounting of the impaired portion as an expense would lower our earnings and jeopardize our ability to demonstrate sustained profitability, which could cause our stock price to decline.

      The Financial Accounting Standards Board also recently adopted a standard to require that the fair value of stock options and other share based payments be reflected as an expense item in the financial statements

of public companies for years beginning after June 15, 2005. As a result of the adoption of this standard, our recorded non-cash expenses will significantly increase, which may impair our ability to maintain profitability.

      The failure of the Internet to continue developing into a significant commercial medium would harm our ability to increase our revenue and execute our business strategy. Rapid growth in the acceptance and use of the Internet as an effective medium of commerce is a recent development. The acceptance and use of the Internet may not continue to develop and a sufficiently broad base of consumers may not adopt and continue to use the Internet as a medium of commerce. We rely on purchasers who have historically used traditional means of commerce to purchase goods or transact business. If we are to be successful, these purchasers must accept and use the Internet as a means of purchasing goods and services and exchanging information. We cannot predict the rate at which these purchasers will do so.

      Our business is based on delivering services over the Internet, and the success of our business therefore depends on the development and maintenance of a sound Internet infrastructure. This includes maintenance of a reliable network backbone with the necessary speed, data capacity and security, as well as timely development of complementary products such as high-speed modems, for providing reliable Internet access and services. Our ability to increase the speed and scope of our services is limited by, and depends upon, the speed and reliability of both the Internet and our clients’ internal networks. Consequently, as Internet usage increases, the growth of the market for our services depends upon improvements made to the Internet as well as to individual client’s networking infrastructures to alleviate overloading and congestion. In addition, any delays in the adoption of new standards and protocols required to govern increased levels of Internet activity or increased governmental regulation may have a detrimental effect on the Internet infrastructure.

      The market for e-commerce solutions is extremely competitive and we may find ourselves unable to compete effectively. Because there are relatively low barriers to entry in the e-commerce market, we expect competition to intensify as current competitors expand their product offerings and new competitors enter the market. In addition, our clients may become competitors in the future Increased competition is likely to result in price reductions, lower average sales prices, reduced margins, longer sales cycles and a decrease or loss of our market share, any of which could negatively impact our revenue and earnings. We face competition from the following sources:

      We believe that the principal competitive factors in our market are breadth of products and services, number of clients and online channel partnerships, brand recognition, system reliability and scalability, price, customer service, speed and accessibility and ease of use, speed to market, convenience and quality of delivery. The online channel partners and the other companies described above may compete directly with us by adopting a similar business model. Moreover, while some of these companies are also clients or potential clients of ours, they may compete with our e-commerce outsourcing solution to the extent that they develop e-commerce systems or acquire such systems from other software vendors or service providers.

      Many of our competitors have, and new potential competitors may have, more experience developing Internet-based software and e-commerce solutions, larger technical staffs, larger customer bases, more established distribution channels and customer relationships, greater brand recognition and greater financial, marketing and other resources than us. In addition, competitors may be able to develop services that are superior to our services, achieve greater customer acceptance or have significantly improved functionality as compared to our existing and future products and services. Our competitors may be able to respond more quickly to technological developments and changes in customers’ needs. Our inability to compete successfully against current and future competitors could cause our revenue and earnings to decline.

      Our ability to successfully offer services and implement our business plan in a rapidly evolving market requires an effective planning and management process. We have rapidly and significantly expanded the depth and breadth of our service offerings. Failure to properly manage this expansion could place a significant strain on our managerial, operational and financial resources. To manage this expansion, we are required to continually:

      We may be unable to install management information and control systems in an efficient and timely manner, and our current or planned personnel, systems, procedures and controls may be inadequate to support our operations.

      We periodically enhance and expand our technology and transaction-processing systems, network infrastructure and other technologies to accommodate increases in the volume of traffic on our technology platform. Any inability to add software and hardware or to develop and upgrade existing technology, transaction-processing systems or network infrastructure to manage increased traffic on this platform may cause unanticipated systems disruptions, slower response times and degradation in client services, including impaired quality and speed of order fulfillment. Failure to manage increased traffic could harm our reputation and significantly reduce demand for our services, which would impair the growth of our business. We may be unable to improve and increase the capacity of our network infrastructure sufficiently or anticipate and react to expected increases in the use of the platform to handle increased volume. Further, additional network capacity may not be available from third-party suppliers when we need it. Our network and our suppliers’ networks may be unable to maintain an acceptable data transmission capability, especially if demands on the platform increase.

      We continue to enhance our e-commerce platforms to better support new features and functionality demanded by our client base. Failure of these to perform as expected could lead to client dissatisfaction and loss of business.

      To remain competitive, we must continue to enhance and improve the responsiveness, functionality and features of our CST technology platform and the underlying network infrastructure. If we incur significant costs without adequate results, or are unable to adapt rapidly to technological changes, we may fail to achieve our business plan. The Internet and the e-commerce industry are characterized by rapid technological change, changes in user and client requirements and preferences, frequent new product and service introductions embodying new technologies and the emergence of new industry standards and practices that could render our technology and systems obsolete. To be successful, we must adapt to rapid technological change by licensing and internally developing leading technologies to enhance our existing services, developing new products, services and technologies that address the increasingly sophisticated and varied needs of our clients, and responding to technological advances and emerging industry standards and practices on a cost-effective and timely basis. The development of our CST platform and other proprietary technologies involves significant technical and business risks. We may fail to use new technologies effectively or fail to adapt our proprietary technology and systems to client requirements or emerging industry standards.

      We provide commerce, marketing and delivery services to our clients and end-users through our proprietary technology transaction processing and client management systems. These systems also maintain an electronic inventory of products and gather consumer marketing information. The satisfactory performance, reliability and availability of the technology and the underlying network infrastructure are critical to our operations, level of client service, reputation and ability to attract and retain clients. We have experienced periodic interruptions, affecting all or a portion of our systems, which we believe will continue to occur from time to time. Any systems damage or interruption that impairs our ability to accept and fill client orders could result in an immediate loss of revenue to us, and could cause some clients to purchase services offered by our competitors. In addition, frequent systems failures could harm our reputation.

      Our systems and operations are vulnerable to damage or interruption from:

      We do not carry sufficient business interruption insurance to fully compensate us for losses that may occur.

      We design, develop, implement and manage e-commerce solutions that are crucial to the operation of our clients’ businesses. Defects in the solutions we develop could result in delayed or lost revenue, adverse end-user reaction, and/or negative publicity which could require expensive corrections. As a result, clients who experience these adverse consequences either directly or indirectly as a result of our services could bring claims against us for substantial damages. Any claims asserted could exceed the level of any insurance coverage that may be available to us. Moreover, the insurance we carry may not continue to be available on economically reasonable terms, or at all. The successful assertion of one or more large claims that are uninsured, that exceed insurance coverage or that result in changes to insurance policies (including premium increases) could adversely affect our operating results or financial condition.

      Our future success significantly depends on the continued services and performance of our senior management, particularly Joel A. Ronning, our chief executive officer. Our performance also depends on our ability to retain and motivate our key technical employees who are skilled in maintaining our proprietary technology platform. The loss of the services of any of our executive officers or key technical employees could harm our business if we are unable to effectively replace that officer or employee, or if that person should decide to join a competitor or otherwise directly or indirectly compete with us. Further, we may need to incur additional operating expenses and divert other management time in order to search for a replacement.

      Our future success depends on our ability to continue to identify, attract, hire, train, retain and motivate highly skilled technical, managerial, operations, merchandising, sales and marketing and client service personnel.

      Competition for these personnel is intense, particularly in the Internet industry. We may be unable to successfully attract, assimilate or retain sufficiently qualified personnel. Failure to do so could harm our business growth and profitability. In addition, the market price of our common stock has fluctuated substantially since our initial public offering in August 1998. Consequently, potential employees may perceive our equity incentives as less attractive and current employees whose equity incentives are no longer attractively priced may choose not to remain with our organization. In that case, our ability to attract employees will be adversely affected. Additionally, the Financial Accounting Standards Board recently adopted a proposal requiring that the fair value of stock options and other share based payments be reflected as an expense item in the financial statements of public companies for quarters beginning after June 15, 2005. As a result, our ability to use stock options as equity incentives will be adversely affected, which will make it more difficult to compete for and attract qualified personnel. Finally, should our stock price substantially decline, the retention value of stock options granted since our initial public offering will decline and employees who hold such options may choose not to remain with our organization.

      We regard the protection of our trademarks, copyrights, trade secrets and other intellectual property as critical to our success. We rely on a combination of patent, copyright, trademark, service mark and trade secret laws and contractual restrictions to protect our proprietary rights. We have entered into confidentiality and invention assignment agreements with our employees and contractors, and nondisclosure agreements with parties with whom we conduct business, in order to limit access to and disclosure of our proprietary information. These contractual arrangements and the other steps taken by us to protect our intellectual property may not prevent misappropriation of our technology or deter independent third-party development of similar technologies. We also seek to protect our proprietary position by filing U.S. and foreign patent applications related to our proprietary technology, inventions and improvements that are important to the development of our business. Proprietary rights relating to our technologies will be protected from unauthorized use by third parties only to the extent they are covered by valid and enforceable patents or are effectively maintained as trade secrets. We pursue the registration of our trademarks and service marks in the U.S. and internationally. Effective trademark, service mark, copyright and trade secret protection may not be available in every country in which our services are made available online.

      The steps we have taken to protect our proprietary rights may be inadequate and third parties may infringe or misappropriate our trade secrets, trademarks and similar proprietary rights. Any significant failure on our part to protect our intellectual property could make it easier for our competitors to offer similar services and thereby adversely affect our market opportunities. In addition, litigation may be necessary in the future to enforce our intellectual property rights, to protect our trade secrets or to determine the validity and

scope of the proprietary rights of others. Litigation could result in substantial costs and diversion of management and technical resources.

      From time to time we are named as a defendant in lawsuits claiming that we have, in some way, violated the intellectual property rights of others. Existing lawsuits in this area, as well as any future assertions or prosecutions of claims like these, could require us to expend significant financial and managerial resources. The defense of any claims, with or without merit, could be time-consuming, result in costly litigation and diversion of technical and management personnel, cause product enhancement delays or require that we develop non-infringing technology or enter into royalty or licensing agreements. Royalty or licensing agreements, if required, may be unavailable on terms acceptable to us or at all. In the event of a successful claim of infringement against us and our failure or inability to develop non-infringing technology or license the infringed or similar technology on a timely basis, we may be unable to pursue our current business plan.

      Claims may be made against us for negligence, copyright or trademark infringement, products liability or other theories based on the nature and content of software products or tangible goods that we deliver electronically and physically. Because we did not create these products, we are generally not in a position to know the quality or nature of the content of these products. Although we carry general liability insurance and require that our customers indemnify us against end-user claims, our insurance and indemnification measures may not cover potential claims of this type, may not adequately cover all costs incurred in defense of potential claims, or may not reimburse us for all liability that may be imposed. Any costs or imposition of liability that are not covered by insurance or indemnification measures could be expensive and time-consuming to address, distract management and delay product deliveries, even if we are ultimately successful in the defense of these claims.

      A significant barrier to e-commerce and communications is the secure transmission of confidential information over public networks. Any compromise or elimination of our security could be costly to remedy, damage our reputation and expose us to liability, and dissuade existing and new clients from using our services. We rely on encryption and authentication technology licensed from third parties to provide the security and authentication necessary for secure transmission of confidential information, such as end-user credit card numbers. A party who circumvents our security measures could misappropriate proprietary information or interrupt our operations.

      We may be required to expend significant capital and other resources to protect against security breaches or address problems caused by breaches. Concerns over the security of the Internet and other online transactions and the privacy of users could deter people from using the Internet to conduct transactions that involve transmitting confidential information, thereby inhibiting the growth of our business. To the extent that our activities or those of third-party contractors involve the storage and transmission of proprietary information, such as credit card numbers, security breaches could damage our reputation and expose us to a risk of loss or litigation and possible liability. Our security measures may not prevent security breaches and failure to prevent security breaches could lead to a loss of existing clients and deter potential clients away from our services.

      The payment by end-users for the purchase of digital goods that we process is typically made by credit card. If we incur significant instances of credit card fraud over an extended period of time, it may result in

penalties and termination of our credit card acceptance privileges. Loss of our credit card acceptance privileges would severely impact our ability to process the sale of digital goods where the payment method is by credit card. We may be required to expend significant capital and other resources to protect against these fraudulent transactions.

      Certain privacy and anti-email proponents have engaged in a practice of gathering, and publicly listing, network addresses that they believe have been involved in sending unwanted, unsolicited emails commonly known as SPAM. In response to user complaints about SPAM, Internet service providers have from time to time blocked such network addresses from sending emails to their users. If our network addresses mistakenly end up on these SPAM lists, our ability to provide services for our clients and consummate the sales of digital and physical goods over the Internet could be harmed.

      We are subject to the same federal, state and local laws as other companies conducting business over the Internet. Today, there are relatively few laws specifically directed towards conducting business over the Internet. The adoption or modification of laws related to the Internet could harm our business, operating results and financial condition by increasing our costs and administrative burdens. Due to the increasing popularity and use of the Internet, many laws and regulations relating to the Internet are being debated at the international, federal and state levels. These laws and regulations could cover issues such as:

      Applicability to the Internet of existing laws governing issues such as property ownership, copyrights and other intellectual property issues, taxation, libel, obscenity and personal privacy could also harm our operating results and substantially increase the cost to us of doing business. For example, numerous state legislatures have proposed that tax rules for Internet retailing and catalog sales correspond to enacted tax rules for sales from physical stores. Any requirement that we collect sales tax for each online purchase and remit the tax to the appropriate state authority would be a significant administrative burden to us and possibly depress online sales. This and any other change in laws applicable to the Internet might also require significant management resources to respond appropriately. The vast majority of these laws were adopted prior to the advent of the Internet, and do not contemplate or address the unique issues raised thereby. Those laws that do reference the Internet, such as the Digital Millennium Copyright Act, are only beginning to be interpreted by the courts and their applicability and reach are therefore uncertain.

      We collect and maintain end-user data for our clients, which subjects us to increasing international, federal and state regulation related to online privacy and the use of personal user information. Congress recently enacted anti-SPAM legislation with which we must comply when providing email campaigns for our clients. Bills are pending in Congress and in various states that address online privacy protections. Several states have proposed, and some have enacted, legislation that would limit the use of personal user information or require online services to establish privacy policies. In addition, the U.S. Federal Trade Commission, or FTC, has urged Congress to adopt legislation regarding the collection and use of personal identifying information obtained from individuals when accessing Web sites. In the past, the emphasis has been on information obtained from minors. Focus has now shifted to include online privacy protection for adults. If such legislation is adopted, it may include requirements that companies establish procedures to, among other things:

      Even in the absence of laws requiring companies to establish these procedures, the FTC has settled several proceedings resulting in consent decrees in which Internet companies have been required to establish programs regarding the manner in which personal information is collected from users and provided to third parties. We could become a party to a similar enforcement proceeding. These regulatory and enforcement efforts could limit our collection of demographic and personal information from end-users, which could adversely affect our ability to comprehensively serve our clients.

      The European Union has adopted a privacy directive that regulates the collection and use of information that identifies an individual person. These regulations may inhibit or prohibit the collection and sharing of personal information in ways that could harm our clients or us. The globalization of Internet commerce may be harmed by these and similar regulations because the European Union privacy directive prohibits transmission of personal information outside the European Union. The United States and the European Union have negotiated an agreement providing a “safe harbor” for those companies who agree to comply with the principles set forth by the U.S. Department of Commerce and agreed to by the European Union. Failure to comply with these principles may result in fines, private lawsuits and enforcement actions. These enforcement actions can include interruption or shutdown of operations relating to the collection and sharing of information pertaining to citizens of the European Union. Certain countries in the Asia-Pacific region have also adopted, or are considering adopting, privacy laws similar to those of the European Union, which may impair our ability to expand our revenue from those countries.

      In addition, in July 2003, the European Union implemented rules regarding the collection and payment of Value Added Tax, or VAT. These rules require VAT to be charged on supply delivered over electronic networks, including software and computer services, as well as information and cultural, artistic, sporting, scientific, educational, entertainment and similar services. These services are now being taxed in the country where the purchaser resides rather than where the supplier is located. Historically, suppliers of digital products that existed outside the European Union were not required to collect or remit VAT on digital orders

made to purchasers in the European Union. With the implementation of these rules, we are required to collect and remit VAT on digital orders received from purchasers in the European Union which effectively raises the price for these goods by the VAT amount. This price increase could serve to discourage purchasing of our products and services which in turn could adversely affect our operating results and financial condition.

      Because our services are accessible worldwide, and we facilitate sales of products to end-users worldwide, foreign jurisdictions may claim that we are required to comply with their laws. Laws regulating Internet companies outside of the United States may be less favorable than those in the United States, giving greater rights to consumers, content owners and users. Compliance may be more costly or may require us to change our business practices or restrict our service offerings relative to those provided in the United States. Any failure to comply with foreign laws could subject us to penalties ranging from fines to bans on our ability to offer our services.

      As our services are available over the Internet in multiple states and foreign countries, these jurisdictions may claim that we are required to qualify to do business as a foreign corporation in each state or foreign country. We and/or our subsidiaries are qualified to do business only in California, Colorado, Connecticut, Delaware, Georgia, Iowa, Michigan, Minnesota, New Jersey, New York, North Carolina, Ohio, Utah and Washington. Failure to qualify as a foreign corporation in a required jurisdiction could subject us to taxes and penalties and could result in our inability to enforce contracts in these jurisdictions.

      In addition, we are subject to United States laws governing the conduct of business with other countries, such as export control laws, which prohibit or restrict the export of goods, services and technology to designated countries, denied persons or denied entities from the United States. Violation of these laws could result in fines or other actions by regulatory agencies and result in increased cost of doing business and reduced profits. In addition, any significant changes in these laws, particularly an expansion in the export control laws, will increase our costs of compliance and may further restrict our overseas client base.

      We sell products and services to end-users outside the United States and we intend to continue to expand our international presence. Expansion into international markets, particularly the European and Asia-Pacific regions, requires significant resources that we may fail to recover by generating additional revenue. Conducting business outside of the United States is subject to risks, including:

      These risks have grown with the recent acquisition of element 5, which has substantial operations outside the U.S. and our expansion into the Asia-Pacific region.

      We may be unable to successfully and cost-effectively market, sell and distribute our services in foreign markets. This may be more difficult or take longer than anticipated especially due to international challenges, such as language barriers, currency exchange issues and the fact that the Internet infrastructure in foreign

countries may be less advanced than the U.S. Internet infrastructure. If we are unable to successfully expand our international operations, or manage this expansion, our operating results and financial condition could be harmed.

      Currently, we collect sales, use or other similar taxes with respect to electronic software download in states where we believe that we have nexus. The application of sales related taxes to interstate and international sales over the Internet is unclear and evolving. We are already required to collect and remit VAT in the European Union, for example. Local, state or foreign jurisdictions may seek to impose sales or use tax collection obligations on out-of-state companies like ours that engage in e-commerce. A successful assertion by one or more states or any foreign country that we should collect sales, use or other taxes on the sale of merchandise through our physical goods clients or on physical shipments of software could harm our results of operations. In addition, any failure by a physical goods client to collect obligatory sales or use taxes could cause the relevant jurisdiction to attempt imposing that obligation on us.

      Keeping abreast of, and in compliance with, changing laws, regulations and standards relating to corporate governance and public disclosure, including the Sarbanes-Oxley Act of 2002, new SEC regulations and Nasdaq Stock Market rules, have required an increased amount of management attention and external resources. We intend to invest all reasonably necessary resources to comply with evolving corporate governance and public disclosure standards, and this investment may result in increased general and administrative expenses and a diversion of management time and attention from revenue-generating activities to compliance activities.

      We require substantial working capital to fund our business. If capital requirements vary materially from those currently planned, we may require additional financing sooner than anticipated. We filed with the Securities and Exchange Commission a universal shelf registration statement on Form S-3, of which this prospectus is a part, pursuant to which we may sell up to $255 million in equity or debt securities. In addition, we filed with the Securities and Exchange Commission an acquisition shelf registration statement on Form S-4 pursuant to which we may issue up to 1,480,000 shares of common stock in connection with future acquisitions of other businesses, assets or securities. If additional funds are raised through the issuance of equity securities, the percentage ownership of our stockholders will be reduced, stockholders may experience additional dilution or these equity securities may have rights, preferences or privileges senior to those of our common stock. In June 2004, we issued 1.25% convertible notes which require us to make interest payments and will require us to pay principal when the notes become due in 2024 or in the event of acceleration under certain circumstances, unless the notes are converted into our common stock prior to that. We may not have sufficient capital to service this or any future debt securities that we may issue, and the conversion of the notes into our common stock may result in further dilution to our stockholders. Our capital requirements depend on several factors, including the rate of market acceptance of our products, the ability to expand our client base and the growth of sales and marketing. We have had significant operating losses and negative cash flow from operations since inception. Additional financing may not be available when needed, on terms favorable to us or at all. If adequate funds are not available or are not available on acceptable terms, we may be unable to develop or enhance our services, take advantage of future opportunities or respond to competitive pressures, which would harm our operating results and adversely affect our ability to sustain profitability.

      The stock market, and the trading prices of Internet-related companies in particular, have been notably volatile. This volatility is likely to continue in the short-term and is not necessarily related to the operating performance of affected companies. This broad market and industry volatility could significantly reduce the price of our common stock at any time, without regard to our operating performance. Factors that could cause our stock price in particular to fluctuate include, but are not limited to:

      In addition, our stock price may be impacted by the short sales and actions of other parties who may disseminate misleading information about us in an effort to profit from fluctuations in our stock price.

      We are party to a lawsuit which alleges that we, certain of our officers and directors and the underwriters of our initial public offering, or IPO, violated Section 11 of the Securities Act of 1933 based on allegations that our IPO registration statement and prospectus failed to disclose material facts regarding the compensation to be received by, and the stock allocation practices of, the IPO underwriters. Similar complaints, pursuing similar theories, were filed in the same court against hundreds of other public companies.

      The IPO lawsuit, as well as any future allegations that we may have, in some way, violated securities laws could require us to expend significant financial and managerial resources and could result in further volatility of our stock price. The defense of any claims, with or without merit, could be time-consuming, result in costly litigation and divert technical and management personnel.

      Because we have a substantial net operating loss carryforward, the related deferred tax asset is fully reserved on our balance sheet. At some future date when we meet the requirements, we may reflect the benefit of the deferred tax asset and taxation of our financial results in our financial statements. The recognition of taxes may adversely affect the trading price of our stock in the stock market. It is also possible under existing accounting rules that we may be required to record income tax expense although we may have no cash outlay for these taxes or the ability to recognize the deferred tax asset under current accounting rules. In addition, we may also be expected to pay alternative minimum tax or foreign taxes even though we have a net operation loss carryforward.

      Certain provisions of our amended and restated certificate of incorporation, bylaws, other agreements and Delaware law could make it more difficult for a third party to acquire us, even if a change in control would be beneficial to our stockholders.

Risks Related to the Acquisition of Element 5 AG

      element 5 has experienced significant losses since inception ($10.2 million through March 31, 2004) and has experienced significant negative cash flows from operations. To address these risks, we and element 5 must, among others things, maintain existing and develop new relationships with independent software publishers, online retailers and other companies outside of the software market, maintain and increase element 5’s client base, implement and successfully execute its business and marketing strategy, continue to develop and upgrade its technology and transaction-processing systems, provide superior customer service and order fulfillment, respond to competitive developments, and attract, retain and motivate qualified personnel. There can be no assurances that we will be successful in addressing such risks, and the failure to do so could have a material adverse effect on our business, financial condition and results of operations.

      Our acquisition of element 5 in April 2004 is recent. We therefore have a very limited operating history with element 5 and limited experience in managing its business. Integrating element 5 is a complex and time-consuming process. Prior to the acquisition, Digital River and element 5 operated independently, each with its own business, corporate culture, locations, employees and systems. Eventually, we intend to operate as a combined organization utilizing common technology, information and communication systems, operating procedures, financial controls, and human resource practices. There may be substantial difficulties, costs and delays involved in any integration of element 5 into Digital River. These may include:

      Many of these risks are accentuated because element 5’s operations, employees and customers are largely located outside of the U.S. Any one or all of these factors may increase operating costs or lower anticipated financial performance. Many of these factors are also outside of our control. Achieving anticipated

synergies and the potential benefits underlying our reasons for the acquisition will depend on successful integration of the two businesses. The failure to integrate element 5 successfully would have a material adverse effect on our business, financial condition and results of operations.

      There can be no assurance that we will be able to retain element 5’s customers following the acquisition. A failure to retain element 5’s customers could have a material adverse effect on our financial condition and profitability.

      Approximately one half of element 5’s revenue and most of its costs are denominated in Euros and currencies other than U.S. dollars. As a result, a greater proportion of our revenues, earnings and costs will now be subject to currency fluctuations. We do not have, and we do not have plans to implement, a currency hedging program to mitigate the effect of fluctuations of currency prices on our financial results. As a result, our future operating results may be subject to fluctuations due to volatility in foreign currency exchange markets.

FORWARD-LOOKING STATEMENTS

      Some of the statements in this prospectus and the documents incorporated by reference are forward-looking statements. These statements are based on our current expectations, assumptions, estimates and projections about our business and our industry, and involve known and unknown risks, uncertainties and other factors that may cause our or our industry’s results, levels of activity, performance or achievement to be materially different from any future results, levels of activity, performance or achievements expressed or implied in or contemplated by the forward-looking statements. Words such as “believe,” “anticipate,” “expect,” “intend,” “plan,” “will,” “may,” “should,” “estimate,” “predict,” “potential,” “continue,” or the negative of such terms or other similar expressions, identify forward-looking statements. In addition, any statements that refer to expectations, projections or other characterizations of future events or circumstances are forward-looking statements. Our actual results could differ materially from those anticipated in such forward-looking statements as a result of several factors more fully described under the caption “Risk Factors” and in the documents incorporated by reference. The forward-looking statements made in this prospectus relate only to events as of the date on which the statements are made.

RATIO OF EARNINGS TO FIXED CHARGES

      The following table sets forth the ratio of earnings to fixed charges for each of the last five years (in millions):

      The ratio of earnings to fixed charges is computed by dividing income (loss) from operations plus fixed charges by fixed charges. Fixed charges consist of interest expense, amortization of debt issuance costs and that portion of rental payments under operating leases that we believe to be representative of interest. Earnings were insufficient to cover fixed charges in 2000 through 2002 by amounts equal to the net loss for the period.

USE OF PROCEEDS

      Unless otherwise indicated in the prospectus supplement, we currently intend to use the net proceeds from the sale of securities offered by this prospectus for general corporate purposes, including capital expenditures and to meet working capital needs. We may also use a portion of the net proceeds to acquire or invest in businesses, products and technologies that are complementary to our own. Pending such uses, we may invest the net proceeds in interest-bearing securities.

DIVIDEND POLICY

      We have never declared or paid any cash dividends on our capital stock. We intend to retain any future earnings to support operations and to finance the growth and development of our business and we do not anticipate paying cash dividends for the foreseeable future.

DESCRIPTION OF CAPITAL STOCK

      Our authorized capital stock consists of 60,000,000 shares of common stock, par value $0.01 per share, and 5,000,000 shares of preferred stock, par value $0.01 per share. As of March 1, 2005, there were 34,179,543 shares of our common stock issued and outstanding, 4,425,486 shares of common stock reserved for issuance upon the conversion of our 1.25% Convertible Senior Notes due 2024 and no shares of preferred stock issued or outstanding.

Common Stock

      The holders of common stock are entitled to one vote for each share held of record on all matters submitted to a vote of the stockholders. Subject to preferences that may be applicable to any outstanding shares of preferred stock, the holders of common stock are entitled to receive ratably any dividends declared by the board of directors out of legally available funds. In the event of a liquidation, dissolution or winding up of our company, holders of the common stock are entitled to share ratably in all assets remaining after payment of liabilities and the liquidation preferences of any outstanding shares of preferred stock. Holders of common stock have no preemptive rights and no right to convert their common stock into any other securities. There are no redemption or sinking fund provisions applicable to the common stock. All of our outstanding shares of common stock are, and all of the shares of common stock offered by this prospectus as well as all of the shares of our common stock issuable upon the conversion of our outstanding convertible notes and upon the conversion of any preferred stock or debt securities offered pursuant to this prospectus, when issued and paid for, will be, fully paid and non-assessable.

Preferred Stock

      Pursuant to our amended and restated certificate of incorporation, our board of directors has the authority, without further action by the stockholders, to issue up to 5,000,000 shares of preferred stock in one or more series and to fix the designations, powers, preferences, privileges and relative participating, optional or special rights and the qualifications, limitations or restrictions thereof, including dividend rights, conversion rights, voting rights, terms of redemption and liquidation preferences, any or all of which may be greater than the rights of the common stock.

      We will fix the rights, preferences, privileges, limitations and restrictions of the preferred stock of each series that we sell under this prospectus and applicable prospectus supplements in the certificate of designation relating to that series. We will incorporate by reference as an exhibit to the registration statement that includes this prospectus the form of any certificate of designation that describes the terms of the series of preferred stock we are offering before the issuance of the related series of preferred stock. This description will include:

      When we issue shares of preferred stock under this prospectus, the shares will be fully paid and nonassessable and will not have, or be subject to, any preemptive or similar rights.

      Delaware law provides that the holders of preferred stock will have the right to vote separately as a class on any proposal involving fundamental changes in the rights of holders of that preferred stock. This right is in addition to any voting rights that may be provided for in the applicable certificate of designation.

      The issuance of preferred stock could adversely affect the voting power of holders of our common stock, and the likelihood that holders of preferred stock will receive dividend payments and payments upon liquidation may have the effect of delaying, deferring or preventing a change in control of us, which could depress the market price of our common stock and securities convertible into our common stock.

Antitakeover Effects of Provisions of Charter Documents and Delaware Law

      Charter Documents. Our amended and restated certificate of incorporation and bylaws include a number of provisions that may have the effect of deterring hostile takeovers or delaying or preventing changes in control or management of our company. First, our certificate of incorporation provides for a “classified” board of directors in which only approximately one third of the directors are elected at each annual meeting of stockholders. Our certificate of incorporation also provides that all stockholder action must be effected at a duly called meeting of stockholders and not by a consent in writing. Further, our bylaws limit who may call special meetings of the stockholders. Our certificate of incorporation does not include a provision for cumulative voting for directors. Under cumulative voting, a minority stockholder holding a sufficient percentage of a class of shares may be able to ensure the election of one or more directors. Finally, our bylaws establish procedures, including advance notice procedures, with regard to the nomination of candidates for election as directors and stockholder proposals. These and other provisions of our certificate of

incorporation and bylaws and Delaware law could discourage potential acquisition proposals and could delay or prevent a change in control or management of our company.

      Delaware Takeover Statute. We are subject to the provisions of Section 203 of the Delaware General Corporation Law. In general, the statute prohibits a publicly held Delaware corporation from engaging in a business combination with an interested stockholder for a period of three years after the date of the transaction in which the person became an interested stockholder, unless the business combination is approved in a prescribed manner. For purposes of Section 203, a business combination includes a merger, asset sale or other transaction resulting in a financial benefit to the interested stockholder, and an interested stockholder is a person who, together with affiliates and associates, owns, or within three years prior, did own, 15% or more of the corporation’s voting stock.

      These and other provisions of our certificate and bylaws and Delaware law could discourage potential acquisition proposals and could delay or prevent a change in control or management Digital River.

Transfer Agent and Registrar

      Wells Fargo Shareowner Services is the transfer agent and registrar for our common stock.

DESCRIPTION OF DEBT SECURITIES

      We may issue debt securities from time to time in one or more series. The following description summarizes the general terms and provisions of the debt securities that we may offer pursuant to this prospectus that are common to all series. The specific terms relating to any series of our debt securities that we offer will be described in a prospectus supplement. You should read the applicable prospectus supplement for the terms of the series of debt securities offered. Because the terms of specific series of debt securities offered may differ from the general information that we have provided below, you should rely on information in the applicable prospectus supplement that contradicts any information below.

      As required by federal law for all bonds and notes of companies that are publicly offered, the debt securities will be governed by a document called an “indenture.” An indenture is a contract between a financial institution, acting on your behalf as trustee of the debt securities offered, and us. The debt securities will be issued pursuant to an indenture that we will enter into with a trustee, which, unless otherwise indicated in the applicable prospectus supplement, will be Wells Fargo Bank, a national association. When we refer to the “indenture” in this prospectus, we are referring to the indenture under which your debt securities are issued, as may be supplemented by any supplemental indenture applicable to your debt securities. The trustee has two main roles. First, subject to some limitations on the extent to which the trustee can act on your behalf, the trustee can enforce your rights against us if we default on our obligations under the indenture. Second, the trustee performs certain administrative duties for us with respect to the debt securities.

      Unless otherwise provided in any applicable prospectus supplement, the following section is a summary of the principal terms and provisions that will be included in the indenture. This summary is not complete. Because this section is a summary, it does not describe every aspect of the debt securities or the indenture. If we refer to particular provisions in the indenture, such provisions, including the definition of terms, are incorporated by reference in this prospectus as part of this summary. We urge you to read the indenture and any supplement thereto that are applicable to you because the indenture, and not this section, defines your rights as a holder of debt securities. The form of indenture is filed as an exhibit to the registration statement of which this prospectus is a part.

General Terms of Debt Securities

      Unless otherwise provided in any applicable prospectus supplement, the debt securities offered hereby will be unsecured obligations of Digital River and will be either our senior unsecured obligations issued in one or more series and referred to herein as the “senior debt securities,” or our subordinated unsecured obligations issued in one or more series and referred to herein as the “subordinated debt securities.” The senior debt securities will rank equal in right of payment to all of our other unsecured and unsubordinated indebtedness. The subordinated debt securities will be subordinated in right of payment to the prior payment in full of the senior debt securities and all of our other senior indebtedness, as described below under “— Subordination Provisions.”

      The indenture contains covenants with respect to the following matters:

      We may agree to additional covenants for the benefit of one or more series of debt securities, and, if so, these will be described in the applicable prospectus supplement.

      The indenture does not limit the total amount of debt securities that we can issue under it, nor does it limit us from incurring or issuing other unsecured or secured debt. Unless otherwise indicated in the applicable prospectus supplement, the indenture pursuant to which the debt securities are issued will not contain any financial covenants or other provisions that protect you in the event we issue a large amount of debt, or in the event that we are acquired by another entity (including in a highly leveraged transaction).

Specific Terms of Debt Securities

      You should read the applicable prospectus supplement for the terms of the series of debt securities offered. The terms of the debt securities described in such prospectus supplement may include the following, as applicable to the series of debt securities offered thereby:

Redemption

      If the debt securities are redeemable, the applicable prospectus supplement will set forth the terms and conditions for such redemption, including:

Conversion and Exchange

      If any series of the debt securities offered are convertible into or exchangeable for shares of our common stock or other securities (which could include securities issued by third parties, including our affiliates), the applicable prospectus supplement will set forth the terms and conditions for such conversion or exchange, including:

Form and Denomination of Debt Securities

      Unless otherwise indicated in the applicable prospectus supplement, the debt securities will be denominated in U.S. dollars, in minimum denominations of $1,000 and multiples thereof.

      We may issue the debt securities in registered form, in which case we may issue them either in book-entry form only or in “certificated” form. We will issue registered debt securities in book-entry form only, unless we specify otherwise in the applicable prospectus supplement. Debt securities issued in book-entry form will be represented by global securities.

      We also will have the option of issuing debt securities in non-registered form, as bearer securities, if we issue the securities outside the United States to non-U.S. persons. In that case, the applicable prospectus supplement will set forth the mechanics for holding the bearer securities, including the procedures for receiving payments, for exchanging the bearer securities for registered securities of the same series and for receiving notices. The applicable prospectus supplement will also describe the requirements with respect to our maintenance of offices or agencies outside the United States and the applicable U.S. federal tax law requirements.

Holders of Registered Debt Securities

      We will issue registered debt securities in book-entry form only, unless we specify otherwise in the applicable prospectus supplement. Debt securities held in book-entry form will be represented by one or more global securities registered in the name of a depositary or its nominee. The depositary or its nominee will hold such global securities on behalf of financial institutions that participate in such depositary’s book-entry system. These participating financial institutions, in turn, hold beneficial interests in the global securities either on their own behalf or on behalf of their customers.

      Under the indenture, only the person in whose name a debt security is registered is recognized as the holder of that debt security. Consequently, for debt securities issued in global form, we will recognize only the depositary or its nominee as the holder of the debt securities, and we will make all payments on the debt securities to the depositary or its nominee. The depositary will then pass along the payments that it receives to its participants, which in turn will pass the payments along to their customers who are the beneficial owners of the debt securities. The depositary and its participants do so under agreements they have made with one another or with their customers or by law; they are not obligated to do so under the terms of the debt securities or the terms of the indenture.

      As a result, investors will not own debt securities directly. Instead, they will own beneficial interests in a global security, through a bank, broker or other financial institution that participates in the depositary’s book-entry system, or that holds an interest through a participant in the depositary’s book-entry system. As long as the debt securities are issued in global form, investors will be indirect holders, and not holders, of the debt securities.

      In the event that we issue debt securities in certificated form, or in the event that a global security is terminated, investors may choose to hold their debt securities either in their own names or in “street name.” Debt securities held in street name are registered in the name of a bank, broker or other financial institution chosen by the investor, and the investor would hold a beneficial interest in those debt securities through the account that he or she maintains at such bank, broker or other financial institution.

      For debt securities held in street name, we will recognize only the intermediary banks, brokers and other financial institutions in whose names the debt securities are registered as the holders of those debt securities, and we will make all payments on those debt securities to them. These institutions will pass along the payments that they receive from us to their customers who are the beneficial owners pursuant to agreements that they have entered into with such customers or by law; they are not obligated to do so under the terms of the debt securities or the terms of the indenture. Investors who hold debt securities in street name will be indirect holders, and not holders, of the debt securities.

      Our obligations, as well as the obligations of the trustee and those of any third parties employed by the trustee or us, run only to the registered holders of the debt securities. We do not have obligations to investors who hold beneficial interests in global securities, in street name or by any other indirect means and who are,

therefore, not the registered holders of the debt securities. This will be the case whether an investor chooses to be an indirect holder of a debt security, or has no choice in the matter because we are issuing the debt securities only in global form.

      For example, once we make a payment or give a notice to the registered holder of the debt securities, we have no further responsibility with respect to such payment or notice even if that registered holder is required, under agreements with depositary participants or customers or by law, to pass it along to the indirect holders but does not do so. Similarly, if we want to obtain the approval of the holders for any purpose (for example, to amend an indenture or to relieve us of the consequences of a default or of our obligation to comply with a particular provision of an indenture), we would seek the approval only from the registered holders, and not the indirect holders, of the debt securities. Whether and how the registered holders contact the indirect holders is up to the registered holders.

      Notwithstanding the above, when we refer to “you” or “your” in this prospectus, we are referring to investors who invest in the debt securities being offered by this prospectus, whether they are the registered holders or only indirect holders of the debt securities offered. When we refer to “your debt securities” in this prospectus, we mean the series of debt securities in which you hold a direct or indirect interest.

      If you hold debt securities through a bank, broker or other financial institution, either in book-entry form or in street name, we urge you to check with that institution to find out:

Global Securities

      A global security represents one or any other number of individual debt securities. Generally, all debt securities represented by the same global securities will have the same terms. Each debt security issued in book-entry form will be represented by a global security that we deposit with and register in the name of a financial institution or its nominee that we select. The financial institution that we select for this purpose is called the depositary. Unless we specify otherwise in the applicable prospectus supplement, The Depository Trust Company, New York, New York, known as DTC, will be the depositary for all debt securities that we issue in book-entry form. A global security may not be transferred to or registered in the name of anyone other than the depositary or its nominee, unless special termination situations arise. We describe those situations below under “— Special Situations When a Global Security Will Be Terminated.” As a result of these arrangements, the depositary, or its nominee, will be the sole registered holder of all debt securities represented by a global security, and investors will be permitted to own only beneficial interests in a global security. Beneficial interests must be held by means of an account with a broker, bank or other financial institution that in turn has an account either with the depositary or with another institution that has an account with the depositary. Thus, an investor whose security is represented by a global security will not be a registered holder of the debt security, but an indirect holder of a beneficial interest in the global security.

      As an indirect holder, an investor’s rights relating to a global security will be governed by the account rules of the investor’s financial institution and of the depositary, as well as general laws relating to securities transfers. The depositary that holds the global security will be considered the registered holder of the debt securities represented by such global security.

      If debt securities are issued only in the form of a global security, an investor should be aware of the following:

      In a few special situations described below, a global security will be terminated and interests in the global security will be exchanged for certificates in non-global form, referred to as “certificated” debt securities. After such an exchange, it will be up to the investor as to whether to hold the certificated debt securities directly or in street name. We have described the rights of direct holders and street name holders under “— Holders of Registered Debt Securities” above. Investors must consult their own banks or brokers to find out how to have their interests in a global security exchanged on termination of a global security for certificated debt securities to be held directly in their own names.

      The special situations for termination of a global security are as follows:

      The applicable prospectus supplement may list situations for terminating a global security that would apply only to the particular series of debt securities covered by such prospectus supplement. If a global security were terminated, only the depositary, and not we or the trustee, would be responsible for deciding the names of the institutions in whose names the debt securities represented by the global security would be registered and, therefore, who would be the registered holders of those debt securities.

Form, Exchange and Transfer of Registered Securities

      If we cease to issue registered debt securities in global form, we will issue them:

      Holders may exchange their certificated securities for debt securities of smaller denominations or combined into fewer debt securities of larger denominations, as long as the total principal amount is not changed.

      Holders may exchange or transfer their certificated securities at the trustee’s office. We have appointed the trustee to act as our agent for registering debt securities in the names of holders transferring debt securities. We may appoint another entity to perform these functions or perform them ourselves. Holders will not be required to pay a service charge to transfer or exchange their certificated securities, but they may be required to pay any tax or other governmental charge associated with the transfer or exchange. The transfer or exchange will be made only if our transfer agent is satisfied with the holders’ proof of legal ownership.

      If we have designated additional transfer agents for your debt security, they will be named in the applicable prospectus supplement. We may appoint additional transfer agents or cancel the appointment of any particular transfer agent. We may also approve a change in the location of the office through which any transfer agent acts. If any certificated securities of a particular series are redeemable and we redeem less than all the debt securities of that series, we may block the transfer or exchange of those debt securities during the period beginning 15 days before the day we mail the notice of redemption and ending on the day of that mailing, in order to freeze the list of holders to prepare the mailing. We may also refuse to register transfers or exchanges of any certificated securities selected for redemption, except that we will continue to permit transfers and exchanges of the unredeemed portion of any debt security that will be partially redeemed.

      If a registered debt security is issued in global form, only the depositary will be entitled to transfer and exchange the debt security as described in this subsection because it will be the sole holder of the debt security.

Payment and Paying Agents

      On each due date for interest payments on the debt securities, we will pay interest to each person shown on the trustee’s records as owner of the debt securities at the close of business on a designated day that is in advance of the due date for interest. We will pay interest to each such person even if such person no longer owns the debt security on the interest due date. The designated day on which we will determine the owner of the debt security, as shown on the trustee’s records, is also known as the “record date.” The record date will usually be about two weeks in advance of the interest due date.

      Because we will pay interest on the debt securities to the holders of the debt securities based on ownership as of the applicable record date with respect to any given interest period, and not to the holders of the debt securities on the interest due date (that is, the day that the interest is to be paid), it is up to the holders who are buying and selling the debt securities to work out between themselves the appropriate purchase price for the debt securities. It is common for purchase prices of debt securities to be adjusted so as

to prorate the interest on the debt securities fairly between the buyer and the seller based on their respective ownership periods within the applicable interest period.

      We will make payments on a global security by wire transfer of immediately available funds directly to the depositary, or its nominee, and not to any indirect holders who own beneficial interests in the global security. An indirect holder’s right to those payments will be governed by the rules and practices of the depositary and its participants, as described under “— Global Securities” above.

      We will make interest payments on debt securities held in certificated form by mailing a check on each due date for interest payments to the holder of the certificated securities, as shown on the trustee’s records, as of the close of business on the record date. We will make all payments of principal and premium, if any, on the certificated securities by check at the office of the trustee, and/or at other offices that may be specified in the applicable prospectus supplement or in a notice to holders, against surrender of the certificated security. All payments by check will be made in next-day funds (that is, funds that become available on the day after the check is cashed).

      If payment on a debt security is due on a day that is not a business day, we will make such payment on the next succeeding business day. The indenture will provide that such payments will be treated as if they were made on the original due date for payment. A postponement of this kind will not result in a default under any debt security or indenture, and no interest will accrue on the amount of any payment that is postponed in this manner.

      Book-entry and other indirect holders should consult their banks or brokers for information on how they will receive payments on their debt securities.

Events of Default

      You will have special rights if an Event of Default occurs with respect to your debt securities and such Event of Default is not cured, as described later in this subsection.

      Unless otherwise specified in the applicable prospectus supplement, the term “Event of Default” with respect to the debt securities offered means any of the following:

      An Event of Default for a particular series of debt securities does not necessarily constitute an Event of Default for any other series of debt securities issued under the same indenture or any other indenture.

      If an Event of Default has occurred and has not been cured within the applicable time period, the trustee or the holders of 25% in principal amount of the debt securities of the affected series may declare the entire principal amount of all the debt securities of that series to be immediately due and payable. This is called a declaration of acceleration of maturity. A declaration of acceleration of maturity may be rescinded by the holders of at least a majority in principal amount of the debt securities of the affected series.

      The trustee may withhold notice to the holders of debt securities of any default, except in the payment of principal or interest, if it considers the withholding of notice to be in the best interests of the holders. Additionally, subject to the provisions of the indenture relating to the duties of the trustee, the trustee is not required to take any action under the indenture at the request of any of the holders of the debt securities unless such holders offer the trustee reasonable protection from expenses and liability (called an “indemnity”). If reasonable indemnity is provided, the holders of a majority in principal amount of the outstanding debt securities of the relevant series may direct the time, method and place of conduct of any lawsuit or other formal legal action seeking any remedy available to the trustee. The trustee may refuse to follow those directions in certain circumstances. No delay or omission in exercising any right or remedy will be treated as a waiver of that right, remedy or Event of Default.

      Before you are allowed to bypass the trustee and bring your own lawsuit or other formal legal action or take other steps to enforce your rights or protect your interests relating to your debt securities, the following must occur:

      Notwithstanding the above, you are entitled at any time to bring a lawsuit for the payment of money due on your debt securities on or after the due date for payment.

      Holders of a majority in principal amount of the debt securities of the affected series may waive any past defaults other than:

      Book-entry and other indirect holders should consult their banks or brokers for information on how to give notice or direction to or make a request of the trustee, and how to declare or rescind an acceleration of maturity on their debt securities.

      With respect to each series of debt securities, we will furnish to each trustee, each year, a written statement of certain of our officers certifying that, to their knowledge, we are in compliance with the provisions of the indenture applicable to such series of debt securities, or specifying an Event of Default.

Merger or Consolidation

      Unless otherwise specified in the applicable prospectus supplement, the terms of the indenture will generally permit us to consolidate or merge with another entity. We will also be permitted to sell all or

substantially all of our assets to another entity. However, we may not take any of these actions unless, among other things, the following conditions are met:

Modification or Waiver

      There are three types of changes we can make to any indenture and the debt securities issued thereunder.

      First, there are changes that we cannot make to the terms or provisions of your debt securities without your specific approval. Subject to the provisions of the indenture, without your specific approval, we may not:

      There are certain changes that we may make to your debt securities without your specific approval and without any vote of the holders of the debt securities of the same series. Such changes are limited to clarifications and certain other changes that would not adversely affect the holders of the outstanding debt securities of such series in any material respect.

      Subject to the provisions of the indenture, any other change to, or waiver of, any provision of the indenture and the debt securities issued pursuant thereto would require the following approval:

      In each case, the required approval must be given in writing.

      When taking a vote, we will decide the principal amount attributable to the debt securities in the following manner:

      Debt securities will not be considered outstanding, and therefore will not be eligible to vote, if we have deposited or set aside in trust money for their payment in full or their redemption. Debt securities will also not be eligible to vote if we can legally release ourselves from all payment and other obligations with respect to such debt securities, as described below under “— Defeasance — Full Defeasance.”

      We will generally be entitled to set any day as a record date for the purpose of determining the holders of outstanding debt securities that are entitled to vote or take other action under the indenture. If we set a record date for a vote or other action to be taken by holders of one or more series of debt securities, such vote or action may be taken only by persons shown on the trustee’s records as holders of the debt securities of the relevant series on such record date.

      Book-entry and other indirect holders should consult their banks or brokers for information on how their approval or waiver may be granted or denied if we seek their approval to change or waive the provisions of an indenture or of their debt securities.

Defeasance

      If specified in the applicable prospectus supplement and subject to the provisions of the indenture, we may elect either:

      In the event of covenant defeasance, you would lose the protection of some of our covenants in the indenture, but would gain the protection of having money and government securities set aside in trust to repay your debt securities.

      Subject to the provisions of the indenture, to accomplish covenant defeasance with respect to the debt securities offered:

      If we were to accomplish covenant defeasance, you could still look to us for repayment of the debt securities if there were a shortfall in the trust deposit or the trustee were prevented from making payment. In fact, if an Event of Default that remained after we accomplish covenant defeasance occurred (such as our bankruptcy) and your debt securities became immediately due and payable, there might be a shortfall in our trust deposit. Depending on the event causing the default, you might not be able to obtain payment of the shortfall.

      If we were to accomplish full defeasance, you would have to rely solely on the funds or notes or bonds that we deposit in trust for repayment of your debt securities. You could not look to us for repayment in the unlikely event of any shortfall in our trust deposit. Conversely, the trust deposit would most likely be protected from claims of our lenders and other creditors if we were to become bankrupt or insolvent.

      Subject to the provisions of the indenture, in order to accomplish full defeasance with respect to the debt securities offered:

Subordination Provisions

      Upon any distribution of our assets upon our dissolution, winding up, liquidation or reorganization, the payment of the principal of, premium, if any, and interest, if any, on the subordinated debt securities will be subordinated, to the extent provided in the subordinated indenture, as supplemented, in right of payment to the prior payment in full of all of our senior indebtedness. Our obligation to make payment of the principal of, premium, if any, and interest, if any, on the subordinated debt securities will not otherwise be affected. In addition, no payment on account of principal and premium, if any, sinking fund or interest, if any, may be made on the subordinated debt securities at any time unless full payment of all amounts due in respect of the principal and premium, if any, sinking fund and interest, if any, on our senior indebtedness has been made or duly provided for in money or money’s worth.

      Notwithstanding the foregoing, unless all of our senior indebtedness has been paid in full, in the event that any payment or distribution made by us is received by the trustee or the holders of any of the subordinated debt securities, such payment or distribution must be paid over to the holders of our senior indebtedness or a person acting on their behalf, to be applied toward the payment of all our senior indebtedness remaining unpaid until all the senior indebtedness has been paid in full. Subject to the payment in full of all our senior indebtedness, the rights of the holders of the subordinated debt securities will be subrogated to the rights of the holders of our senior indebtedness.

      By reason of this subordination, in the event of a distribution of our assets upon our insolvency, certain of our general creditors may recover more, ratably, than holders of the subordinated debt securities. The subordinated indenture provides that these subordination provisions will not apply to money and securities held in trust under the defeasance provisions of the subordinated indenture.

      When we refer to “senior indebtedness” in this prospectus, we are referring to the principal of (and premium, if any) and unpaid interest on:

      If this prospectus is being delivered in connection with the offering of a series of subordinated debt securities, the accompanying prospectus supplement or the information incorporated by reference will set forth the approximate amount of our senior indebtedness outstanding as of a recent date.

Information Concerning the Trustee

      Unless otherwise indicated in the applicable prospectus supplement, Wells Fargo Bank, a national association will be the trustee under the indenture. We may conduct banking and other transactions with the trustee in the ordinary course of business.

Governing Law

      Unless by their terms they provide otherwise, the indenture and the debt securities will be governed by, and construed in accordance with, the law of the State of New York.

DESCRIPTION OF WARRANTS

General

      We may issue warrants for the purchase of common stock, preferred stock or debt securities. Each series of warrants will be issued under a separate warrant agreement to be entered into between us and a bank or trust company, as warrant agent. The warrant agent will act solely as our agent in connection with the warrants. The warrant agent will not have any obligation or relationship of agency or trust for or with any holders or beneficial owners of warrants. This summary of certain provisions of the warrants is not complete. For the complete terms of a particular series of warrants, you should refer to the prospectus supplement for that series of warrants and the warrant agreement for that particular series.

Debt Warrants

      The prospectus supplement relating to a particular issue of warrants to purchase debt securities will describe the terms of the debt warrants, including the following:

      Debt warrant certificates will be exchangeable for new debt warrant certificates of different denominations. Debt warrants may be exercised at the corporate trust office of the warrant agent or any other office indicated in the prospectus supplement. Prior to the exercise of their debt warrants, holders of debt warrants will not have any of the rights of holders of the debt securities purchasable upon exercise and will not be entitled to payment of principal or any premium, if any, or interest on the debt securities purchasable upon exercise.

Stock Warrants

      The prospectus supplement relating to a particular series of warrants to purchase our common stock or preferred stock will describe the terms of the warrants, including the following:

Holders of equity warrants will not be entitled:

      As set forth in the applicable prospectus supplement, the exercise price and the number of shares of common stock or preferred stock purchasable upon exercise of a warrant will be subject to adjustment in certain events, including the issuance of a stock dividend to any holders of common stock, a stock split, reverse stock split, combination, subdivision or reclassification of common stock, and such other events, if any, specified in the applicable prospectus supplement.

PLAN OF DISTRIBUTION

      We may sell the securities separately or together:

      We may sell the securities from time to time in one or more transactions:

      We will set forth in a prospectus supplement the terms of the offering of securities, including:

      If we use underwriters for a sale of securities, the underwriters will acquire the securities for their own account. The underwriters may resell the securities 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 obligations of the underwriters to purchase the securities will be subject to the conditions set forth in the applicable underwriting agreement. The underwriters will be obligated to purchase all the securities of the series offered if they purchase any of the securities of that series. We may use underwriters with whom we have a material relationship. We will describe in the prospectus supplement naming the underwriter the nature of any such relationship.

      One or more firms, referred to as “remarketing firms,” may also offer or sell the securities, if the prospectus supplement so indicates, in connection with a remarketing arrangement upon their purchase. Remarketing firms will act as principals for their own accounts or as agents for Digital River. These remarketing firms will offer or sell the securities pursuant to the terms of the securities. The prospectus supplement will identify any remarketing firm and the terms of its agreement, if any, with Digital River and will describe the remarketing firm’s compensation. Remarketing firms may be deemed to be underwriters in connection with the securities they remarket. Remarketing firms may be entitled under agreements that may be entered into with Digital River to indemnification by us against certain civil liabilities, including liabilities under the Securities Act, and may be customers of, engage in transactions with or perform services for us in the ordinary course of business.

      We may determine the price or other terms of the securities offered under this prospectus by use of an electronic auction. We will describe how any auction will determine the price or any other terms, how potential investors may participate in the auction and the nature of the obligations of the underwriter, dealer or agent in the applicable prospectus supplement.

      Underwriters, dealers or agents may receive compensation in the form of discounts, concessions or commissions from us or our purchasers (as their agents in connection with the sale of securities). These underwriters, dealers or agents may be considered to be underwriters under the Securities Act. As a result, discounts, commissions or profits on resale received by the underwriters, dealers or agents may be treated as underwriting discounts and commissions. The prospectus supplement will identify any such underwriter, dealer or agent, and describe any compensation received by them from us. Any initial public offering price and any discounts or concessions allowed or reallowed or paid to dealers may be changed from time to time.

      We may authorize agents or underwriters to solicit offers by certain types of institutional investors to purchase securities from us at the public offering price set forth in the prospectus supplement pursuant to delayed delivery contracts providing for payment and delivery on a specified date in the future. We will describe the conditions to these contracts and the commissions we must pay for solicitation of these contracts in the prospectus supplement.

      Underwriters, dealers and agents may be entitled to indemnification by us against certain civil liabilities, including liabilities under the Securities Act, or to contribution with respect to payments made by the underwriters, dealers or agents, under agreements between us and the underwriters, dealers and agents.

      We may grant underwriters who participate in the distribution of securities an option to purchase additional securities to cover over-allotments, if any, in connection with the distribution.

      All debt securities will be new issues of securities with no established trading market. Underwriters involved in the public offering and sale of debt securities may make a market in the debt securities. However, they are not obligated to make a market and may discontinue market-making activity at any time. No assurance can be given as to the liquidity of the trading market for any debt securities.

      Underwriters or agents and their associates may be customers of, engage in transactions with or perform services for us in the ordinary course of business.

      Any underwriter may engage in overallotment, stabilizing transactions, short covering transactions and penalty bids in accordance with Regulation M under the Exchange Act. Overallotment involves sales in excess of the offering size, which create a short position. Stabilizing transactions permit bids to purchase the underlying security so long as the stabilizing bids do not exceed a specified maximum. Short covering transactions involve purchases of the securities in the open market after the distribution is completed to cover short positions. Penalty bids permit the underwriters to reclaim a selling concession from a dealer when the securities originally sold by the dealer are purchased in a covering transaction to cover short positions. Those activities may cause the price of the securities to be higher than it would otherwise be. If commenced, the underwriters may discontinue any of the activities at any time.

      Any underwriters who are qualified market makers on the Nasdaq National Market may engage in passive market making transactions in the securities on the Nasdaq National Market in accordance with Rule 103 of Regulation M, during the business day prior to the pricing of the offering, before the commencement of offers or sales of the securities. Passive market makers must comply with applicable volume and price limitations and must be identified as passive market makers. In general, a passive market maker must display its bid at a price not in excess of the highest independent bid for such security; if all independent bids are lowered below the passive market maker’s bid, however, the passive market maker’s bid must then be lowered when certain purchase limits are exceeded.

LEGAL MATTERS

      The validity of the securities being offered hereby will be passed upon by Howard Rice Nemerovski Canady Falk & Rabkin, A Professional Corporation, San Francisco, California.

EXPERTS

      The consolidated financial statements and schedule of Digital River, Inc. and subsidiaries, included in Digital River, Inc.’s Annual Report (Form 10-K) for the year ended December 31, 2004 and Digital River, Inc. management’s assessment of the effectiveness of internal control over financial reporting as of December 31, 2004 included therein, have been audited by Ernst & Young LLP, independent registered public accounting firm, as set forth in their reports thereon included therein, and incorporated herein by reference. Such consolidated financial statements and schedule and management’s assessment have been incorporated herein by reference and included herein, respectively, in reliance upon such reports given on the authority of such firm as experts in accounting and auditing.

WHERE YOU CAN FIND MORE INFORMATION

      We are a reporting company and file annual, quarterly and current reports, proxy statements and other information with the SEC. You may read and copy these reports, proxy statements and other information at the SEC’s public reference room at Room 1024, 450 Fifth Street, N.W., Washington, D.C. You can request copies of these documents by writing to the SEC and paying a fee for the copying cost. Please call the SEC at 1-800-SEC-0330 for more information about the operation of the public reference rooms. Our SEC filings are also available at the SEC’s web site at http://www.sec.gov. In addition, you can read and copy our SEC filings at the office of the National Association of Securities Dealers, Inc. at 1735 K Street, N.W., Washington, D.C. 20006.

      We are incorporating by reference in this prospectus some of the information that we file with the SEC, which means that we can disclose important information to you by referring you to those documents. The information incorporated by reference is an important part of this prospectus, and information that we file later with the SEC will automatically update and supersede this information. We incorporate by reference the documents listed below and any future filings, other than reports furnished and not filed pursuant to Form 8-K, we will make with the SEC under Section 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, including filings made after the date of the filing of the initial registration statement and prior to effectiveness of the registration statement:

      You may access these documents at no cost through our web site at www.digitalriver.com or request a copy of these filings at no cost, by writing or telephoning us at the following address:

Digital River, Inc.

9625 W. 76th Street, Suite 150

Eden Prairie, MN 55344

(952) 253-1234

4,000,000 Shares

DIGITAL RIVER, INC.

Common Stock

PROSPECTUS SUPPLEMENT

March 22, 2006