SUBJECT TO COMPLETION, DATED                    , 2016

This is the initial public offering of American Depositary Shares, or ADSs, of travel B.V., a Dutch private company with limited liability ( besloten vennootschap met beperkte aansprakelijkheid ). Each ADS will represent one Class A share with a nominal value of € 0.06 per share. We are offering             ADSs, and certain of our existing shareholders named in this prospectus (the “Selling Shareholders”) are offering            ADSs in this offering. We will not receive any proceeds from the sale of ADSs by the Selling Shareholders. No public market currently exists for our ADSs or our Class A shares. We currently expect the initial public offering price to be between $            and $            per ADS.

We have applied to have our ADSs listed on the NASDAQ Global Select Market under the symbol “TRVG.”

Investing in our ADSs involves risks. See “ Risk factors ” beginning on page 20.

We will have two classes of shares outstanding after this offering, Class A shares and Class B shares. Each Class A share entitles its holder to one vote on all matters presented to our shareholders generally. Upon completion of this offering, Class B shares will be held solely by Expedia, Inc. and its affiliates. Prior to and after completion of this offering, we intend to take certain actions to simplify our corporate structure. Expedia and Messrs. Schrömgens, Vinnemeier and Siewert, whom we collectively refer to as the Founders, will agree to determine how to proceed with the post-IPO corporate reorganization within twelve months of the completion of this offering, and it is expected that any decision will be implemented no later than four months thereafter. See “ Corporate structure .” Following the post-IPO merger as described herein, assuming it occurs as contemplated, Class B shares will also be held by the Selling Shareholders. Each Class B share entitles its holder to ten votes on all matters presented to our shareholders generally. Immediately following this offering, the holders of ADSs representing our Class A shares will collectively hold         % of the economic interests and those Class A shares represent         % of the voting power in us, and holders of our Class B shares will hold the remaining         % of the economic interests and         % of the voting power in us. Following the post-IPO merger, assuming it occurs as contemplated, the Selling Shareholders will hold         % of the Class B shares and         % of the voting power in us, and Expedia, Inc. and its affiliates will hold         % of the Class B shares and         % of the voting power in us. As a result, both immediately following this offering and after the post-IPO merger, we will be a “controlled company” within the meaning of the corporate governance standards of the NASDAQ Global Select Market. See “ Management—Controlled company exemption .” In the event the post-IPO merger is not consummated, the Founders will hold their ownership interest in trivago SE, a subsidiary of trivago N.V., with the right to contribute such shares to trivago N.V. in exchange for Class A shares or Class B shares. See “ Corporate structure .”

We are both an “emerging growth company” and a “foreign private issuer” under applicable Securities and Exchange Commission rules and will be eligible for reduced public company disclosure requirements. See “ Prospectus summary—Implications of being an ‘emerging growth company’ and a ‘foreign private issuer .’”

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. Any representation to the contrary is a criminal offense.

The underwriters may also exercise their option to purchase up to              additional ADSs from the Selling Shareholders at the public offering price, less the underwriting discount, for 30 days after the date of this prospectus.

The underwriters expect to deliver the ADSs to purchasers on or about                    , 2016 through the book-entry facilities of The Depository Trust Company.

The date of this prospectus is                     , 2016

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For investors outside the United States: Neither we nor the underwriters have done anything that would permit this offering or possession or distribution of this prospectus in any jurisdiction other than the United States where action for that purpose is required. Persons outside the United States who come into possession of this prospectus must inform themselves about, and observe any restrictions relating to, the offering of our ADSs and the distribution of this prospectus outside the United States.

We are incorporated in the Netherlands, and many of our outstanding securities are owned by non-U.S. residents. Under the rules of the U.S. Securities and Exchange Commission, or SEC, we are currently eligible for

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treatment as a “foreign private issuer.” As a foreign private issuer, we will not be required to file periodic reports and financial statements with the SEC as frequently or as promptly as domestic registrants whose securities are registered under the Securities Exchange Act of 1934, as amended, or the Exchange Act.

We are responsible for the information contained in this prospectus. Neither we nor the Selling Shareholders have authorized anyone to provide you with different information, and neither we nor the Selling Shareholders take responsibility for any other information others may give you. We, the Selling Shareholders, and the underwriters are not making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should not assume that the information contained in this prospectus is accurate as of any date other than its date.

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Risk factors

You should carefully consider the risks described below before making an investment decision. Additional risks not presently known to us or that we currently deem immaterial may also impair our business operations. Our business, financial condition, results of operations or prospects could be materially and adversely affected by any of these risks. The trading price and value of our ADSs could decline due to any of these risks, and you may lose all or part of your investment. This prospectus also contains 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 industry and business

Our failure to manage our growth effectively could negatively affect our corporate culture, harm our ability to attract and retain key personnel and adversely impact our results of operations and future growth.

Our entrepreneurial and collaborative culture is important to us, and we believe it has been a major contributor to our success. We may have difficulties maintaining our culture or adapting it sufficiently to meet the needs of our future and evolving operations as we continue to grow. In addition, our ability to maintain our culture as a public company, with the attendant changes in policies, practices, corporate governance and management requirements, and as a result of the corporate reorganization, may be challenged. Failure to maintain our culture could have a material adverse effect on our business, results of operations, financial condition and prospects.

We have rapidly and significantly expanded our operations and anticipate expanding further as we pursue our growth strategy. Our workforce worldwide has grown from fewer than 300 employees as of December 31, 2012 to more than 1,000 employees as of September 30, 2016. Such expansion increases the complexity of our business and places a significant strain on our management, operations, technical systems, financial resources and internal controls over financial reporting functions. As a result, we may not be able to manage our expansion effectively. Our current and planned personnel, systems, procedures and controls may not be adequate to support and effectively manage our future operations, especially as we employ personnel in several geographic locations. We may not be able to hire, train, retain, motivate and manage required personnel, which may limit our growth, damage our reputation and may have a material adverse effect on our business, results of operations, financial condition and prospects. These pressures and challenges may be enhanced by our becoming a public company and the corporate reorganization.

We may not be able to maintain our historical growth rates in future periods.

Our 2015 revenue grew by 59% compared to 2014, and our revenue for the first nine months of 2016 grew by 49% compared to the first nine months of 2015. While we expect our business to continue to grow, we may not be able to maintain our historical growth rates in future periods. Revenue growth may slow or revenues may decline for any number of reasons, including our inability to attract and retain users, decreased user spending, increased competition, slowing growth of the overall online hotel search market, the emergence of alternative business models, changes in government policies and general economic conditions. As the size of our user base continues to increase, we anticipate that the growth rate of our user base may decline over time. We may also lose users for other reasons, such as a failure to deliver satisfactory search results or transaction experiences or high quality services. In addition, even if our user base continues to grow, our revenues may not grow at the same rate or at all. If our growth rates decline, investors’ perceptions of our business and business prospects may be adversely affected.

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We are dependent on economic conditions and declines in travel or discretionary spending generally could reduce the demand for our services.

Our results of operations and financial prospects are significantly dependent upon travelers using our services and the prosperity and solvency of the OTAs, hotel chains and independent hotels that have relationships with us. Travel, including hotel room reservations, is dependent on personal discretionary spending levels. Travel services tend to decline, along with the advertising budgets spent by hotels and other accommodation aggregators, during general economic downturns and recessions. Conditions that reduce disposable income or consumer confidence, such as an increase in interest rates (which, among other things, could cause consumers to incur higher monthly expenses under mortgages), unemployment rates, direct or indirect taxes, fuel prices or other costs of living, may lead users to reduce or stop their spending on travel or to opt for lower-cost products and services, and these conditions may be particularly prevalent during periods of recession, economic downturn or market volatility and disruption. For example, in mid-2016, certain hotel chains cut their growth forecasts for the remainder of the year due to global economic uncertainty, and some analysts suggested that the U.S. hotel industry may have reached a cyclical peak.

Any significant decline in travel, consumer discretionary spending or the occurrence of any of the foregoing conditions may reduce demand for our services, cause advertisers to become insolvent or fail to pay us for services we have already provided. The occurrence of any of the above could have a material adverse effect on our business, results of operations, financial condition and prospects.

Many events beyond our control may adversely affect the travel industry.

Certain events beyond our control may adversely affect the travel industry, with a corresponding negative impact on our business and results of operations. Natural disasters, including hurricanes, tsunamis, earthquakes or volcanic eruptions, as well as other natural phenomena, such as outbreaks of the Zika virus, the Ebola virus, avian flu and other pandemics and epidemics, have disrupted normal travel patterns and levels in the past. The travel industry is also sensitive to events that may discourage travel, such as work stoppages or labor unrest, political instability, regional hostilities, increases in fuel prices, imposition of taxes or surcharges by regulatory authorities, travel related accidents and terrorist attacks or threats. We do not have insurance coverage against loss or business interruption resulting from war and terrorism. The occurrence of any of the foregoing events may have a material adverse effect on our business, results of operations, financial condition and prospects.

Increasing competition and consolidation in our industry could result in a decrease in the amount and types of hotel information we display, the value of our services to users and a loss of users, which would adversely affect our business, financial performance and prospects.

General competition

We operate in the highly and increasingly competitive travel industry. Many of our current and potential competitors, including hotels themselves (both hotel chains and independent hotels), global metasearch and review websites, such as Kayak and TripAdvisor, locally focused metasearch engines such as Qunar, Online Travel Agents, or OTAs, such as Booking.com, Ctrip and Brand Expedia, alternative accommodation websites, such as Airbnb and HomeAway, and other hotel websites, may have existed longer, may have larger user bases, may have a wider range products and services, may have greater brand recognition and customer loyalty in certain markets and/or significantly greater financial, marketing, personnel, technical and other resources than we do. Some of these competitors may be able to offer products and services on more favorable terms. Metasearch websites are also expanding globally and are becoming increasingly competitive. In addition, many

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of these competitors may be able to devote significantly greater resources to marketing and promotional campaigns; attracting and retaining key employees; securing participation of hotels and access to hotel information, including proprietary or exclusive content; website and systems development; research and development; and enhancing the speed at which their services return user search results. Many of these competitors may also offer user incentives, such as loyalty points or priority access to services, which may not be available if travelers book through third-party sites or services.

Advertiser competition

We compete for hotel advertising revenue with search engines, such as Baidu, Bing, Google and Yahoo!, which offer pay-per-click or pay-per-impression advertising services. These competitors may have significantly greater financial, technical, marketing and other resources than we do and large established user bases. In addition, we compete with newspapers, magazines and other traditional media companies that provide offline and online advertising opportunities for hotels. We expect to face additional competition as other established and emerging companies enter the hotel advertising market. Competition could result in higher traffic acquisition costs, lower “cost-per-click,” or CPC, pricing and reduced margins on our advertising services, loss of market share, reduced user traffic to our websites and reduced advertising by hotel companies and other accommodation advertisers on our websites. If fewer advertisers choose to advertise on our website, we will have less information available to display, which makes our services less valuable to users.

Advertiser consolidation

In addition, consolidation among advertisers, or a change to more coordinated or centralized marketing activities within OTA groups and hotel chains, could reduce the number of offers we have available in our marketplace for each hotel, which could cause our services to become less valuable and popular for users and could result in advertisers bidding less for offers or even terminating their relationships with us.

As a result, competition and consolidation, individually or in the aggregate, could result in higher traffic acquisition costs, reduced operating margins, loss of market share, reduced customer traffic to our websites and reduced advertising by OTAs and hotels on our websites. Furthermore, our CPC pricing for click-based advertising depends, in part, on competition among advertisers, with those paying higher CPCs generally receiving better advertising placement and more referrals from us. If our large customers become less competitive with each other, merge with each other, focus more on profit than on traffic volume, or are able to reduce CPCs, this would have an adverse impact on our CPCs which, in turn, may have a material adverse effect on our business, results of operations, financial condition and prospects. In addition, competition and consolidation among our advertisers may cause some of them to have financial difficulties, default on or materially delay their obligations to pay us for services we have already provided or become insolvent. As a result, we may not be able to compete successfully against current and future competitors, and competition and/or consolidation among advertisers may have a material adverse effect on our business, results of operations, financial condition and prospects.

We could be adversely affected by our advertiser concentration.

Our advertiser base consists of OTAs, hotel chains and independent hotels, and we generate the large majority of our revenue from OTAs. Certain brands affiliated as of the date hereof with our majority shareholder, Expedia, including Brand Expedia, Hotels.com, Orbitz, Travelocity, Hotwire, Wotif, ebookers and Venere, in the aggregate, accounted for 39% and 35% of our total revenue for the year ended December 31, 2015 and the nine months ended September 30, 2016, respectively. The Priceline Group and its affiliated brands, Booking.com and, through 2015, Agoda, accounted for 27% and 43% of our total revenue for the year ended December 31, 2015 and the nine months ended September 30, 2016, respectively.

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This concentration of key customers may impact our overall exposure to changes in economic and industry conditions, either positively or negatively, as these key customers may be similarly affected by such conditions. The loss of any major customer, or a significant weakening in the business conditions and/or the financial conditions of OTAs and hotels generally, could result in significant decreases in revenue, as well as an increase in credit losses, and have a material adverse effect on our business, results of operations, financial condition and prospects.

We are subject to counterparty default risks.

We are subject to the risk that a counterparty to one or more of our customer arrangements will default on its performance obligations. A counterparty may not comply with its commercial commitments, which could then lead it to default on its obligations with little or no notice to us. This could limit our ability to take action to mitigate our exposure. Additionally, our ability to mitigate our exposures may be constrained by the terms of our commercial arrangements or because market conditions prevent us from taking effective action. In addition, our ability to recover any funds from financially distressed or insolvent counterparties is limited, and our recovery rates have historically been very low. Because a majority of our accounts receivable are owed by three large OTAs, delays or a failure to pay by any of these advertisers could result in a significant increase in our credit losses, and we may be unable to fund our operations. If one of our counterparties becomes insolvent or files for bankruptcy, our ability to recover any losses suffered as a result of that counterparty’s default may be limited by the liquidity of the counterparty or the applicable laws governing the bankruptcy proceedings. In the event of such default, we could incur significant losses, which could adversely impact our business, results of operations, financial condition and prospects.

We may be unable to maintain and increase brand awareness, which could limit our ability to maintain our current financial performance or achieve additional growth.

We rely heavily on the trivago brand. Awareness, perceived quality and perceived differentiated attributes of our brand are important aspects of our efforts to attract and expand the number of travelers using our websites and apps. Many of our competitors have more resources than we do and can spend more on advertising their brands and services. As a result, we are required to spend considerable amounts of money and other resources to preserve and increase our brand awareness and grow our business. Competition for top-of-mind awareness and brand preference is intense among online hotel search services, globally and in key geographies. If we are unable to effectively preserve and increase our brand awareness, we may be unable to successfully maintain or enhance the strength of our brand.

In 2009, we began a successful broad-reach TV marketing campaign. We expect to continue to invest in TV marketing campaigns in light of increased spending from competitors, our expansion into geographies where our brand is less well known, increasing prices and the increasing traffic share growth of search engines as destination sites for users. Such efforts may not maintain or enhance consumer awareness of our brand and, even if we are successful in our branding efforts, such efforts may not be cost-effective or as efficient as they have been historically. We intend to continue expanding our operations globally, including in countries where we have limited operating experience, that may have different competitive conditions and where travelers may have different travel preferences. Users in other countries may not be familiar with our brand, or may be less familiar with our brand than that of a competitor, and we may need to build brand awareness in such countries through greater investments in advertising and promotional activities. In addition, significant increases in the pricing of one or more of our marketing and advertising channels could increase our advertising expense or cause us to choose less effective marketing and advertising channels. TV advertising comprises a large percentage of our advertising expense and may have higher costs than other channels and which could have a

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material adverse effect on our profitability. If TV advertising becomes less effective or if we experience diminishing returns from TV advertising overall or in key markets, we may instead invest in other, more expensive channels, which may not be as successful. If we are unable to maintain or enhance consumer awareness of our brand or to generate demand in a cost-effective manner, it may have a material adverse effect on our business, results of operations, financial condition and prospects.

We have registered domain names for websites that we use in our business, such as www.trivago.com, www.trivago.de and www.trivago.co.uk. If we lose the ability to use a domain name, we would be forced to incur significant expenses to market our services under a new domain name, which could substantially harm our business. In addition, our competitors could attempt to capitalize on our brand recognition by using domain names similar to ours. Domain names similar to ours have been registered in the United States and elsewhere, and in some countries the top level domain name “trivago” is owned by other parties. We may be unable to prevent third parties from acquiring and using domain names that infringe on, are similar to, or otherwise decrease the value of, our brand or our trademarks or service marks. Protecting and enforcing our rights to our domain names and determining the rights of others may require litigation, which could result in substantial costs and diversion of management attention.

Our brands are subject to reputational risks and impairment.

We have developed our trivago brand through extensive marketing campaigns, website promotions, customer referrals and the use of a dedicated sales force. We cannot guarantee that our brand will not be damaged by circumstances that are outside our control or by third parties, such as hackers, or interfaces with their clients, such as subcontractors’ employees or sales forces, with a resulting negative impact on our activities. For example, the independent actors we rely on in various countries where we advertise have come to represent our brand, such as “Mr. trivago” in the United States and “the trivago girl” in Australia. The actions of such actors are not in our control, and negative publicity about such actors could affect our brand image. Also, it is possible that the use of testimonials in the advertising and promotion of our brands could have a negative impact on customer retention and acquisition if the reputation of the testimonial provider is damaged. A failure on our part to protect our image, reputation and the brand under which we market our products and services may have a material adverse effect on our business, results of operations, financial condition and prospects.

If we are unable to maintain or establish relationships with advertisers, or if advertisers choose to reduce or even eliminate the fees they pay us, our financial performance could be materially adversely affected.

Our ability to attract users to our services depends in large part on providing a comprehensive set of search results and transparent pricing information. To do so, we maintain relationships with OTAs, hotel chains and independent hotels to include their data in our search results. The loss of existing relationships with advertisers, or our inability to continue to add new ones, may cause our search results to provide incomplete pricing, availability and other information important to users of our services. This deficiency could reduce user confidence in the search results we provide, making us less popular.

In addition, nearly all of our agreements with OTAs, hotel chains and independent hotels may be terminated at will or upon three to seven days’ prior notice by either party. We cannot guarantee that our advertisers will continue to work with us. We may also be unable to negotiate access, pricing or other terms that are consistent or more favorable than our current terms. A failure to retain current terms or obtain more favorable terms with, or increase or maintain our relationships with, our advertisers may have a material adverse effect on our business, results of operations, financial condition and prospects.

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We have identified a material weakness in our internal control over financial reporting and may identify additional material weaknesses in the future that may cause us to fail to meet our reporting obligations or result in material misstatements of our financial statements. If we fail to remediate our material weakness or if we fail to establish and maintain an effective system of internal control over financial reporting, we may not be able to report our financial results accurately or to prevent fraud. Any inability to report and file our financial results accurately and timely could harm our business and adversely impact the trading price of our securities.

Our management is responsible for establishing and maintaining internal controls over financial reporting, disclosure controls, and complying with other requirements of the Sarbanes-Oxley Act and the rules promulgated by the SEC thereunder. Internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements in accordance with U.S. generally accepted accounting principles. A material weakness is defined as a deficiency, or a combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of a company’s annual or interim financial statements will not be prevented or detected on a timely basis by the company’s internal controls

Prior to this offering, we have been a private company with limited accounting personnel and other resources with which to address our internal control over financial reporting. In addition, we have historically prepared our books and records in accordance with the German Commercial Code ( Handelsgesetzbuch ), or German GAAP. Our books and records were then converted to U.S. GAAP, for purposes of this offering, by accounting personnel who have limited experience in maintaining books and records and preparing financial statements in U.S. GAAP.

In connection with the audit of our 2015 financial statements, we identified a material weakness, primarily related to the lack of sufficient accounting and supervisory personnel with the appropriate level of technical accounting experience and training necessary or processes and procedures, particularly in the areas of share-based compensation, build-to-suit lease accounting and internal use software and capitalization of website development costs and other complex, judgmental areas and consequently must rely on the assistance of outside advisors with expertise in these matters to assist us in our preparation of U.S. GAAP financial statements and our compliance with SEC reporting obligations. These deficiencies represent a material weakness in our internal control over financial reporting in both design and operation. During 2016, we appointed a chief financial officer who is responsible for identifying the staffing and resource needs of our company required to remediate the material weakness. These individuals will be required to have sufficient experience in maintaining books and records and preparing financial statements in U.S. GAAP. We have initiated the hiring of additional staff that have begun to address these needs. Additionally, we will expand our accounting policies and procedures as well as provide additional training to our accounting and finance staff. While we are working to remediate the material weakness as quickly and efficiently as possible and expect to have remediated the material weakness during the year ended December 31, 2017, at this time we cannot provide an estimate of costs expected to be incurred in connection with implementing this remediation plan. These remediation measures may be time consuming, costly, and might place significant demands on our financial and operational resources. If we are unable to successfully remediate this material weakness, and if we are unable to produce accurate and timely financial statements, our financial statements could contain material misstatements that, when discovered in the future, could cause us to fail to meet our future reporting obligations and cause the price of our ADSs to decline.

Until the end of the fiscal year for which we will file our second annual report on Form 20-F after becoming a public company, we will not be required to make a formal assessment of the effectiveness of our internal controls over financial reporting. Even from the time such requirement applies, our management cannot guarantee that our internal controls and disclosure controls will prevent all possible errors or all fraud. For as long as we are an “emerging growth company” under the JOBS Act, our independent registered public

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accounting firm will not be required to attest to the effectiveness of our internal controls over financial reporting pursuant to Section 404 of the Sarbanes-Oxley Act. Furthermore, after the date we are no longer an emerging growth company, our independent registered public accounting firm will only be required to attest to the effectiveness of our internal controls over financial reporting depending on our market capitalization. An independent assessment of the effectiveness of our internal controls could detect problems that our management’s assessment might not.

If we are not able to establish and maintain an effective system of internal controls and otherwise implement the requirements of Section 404 in a timely manner or with adequate compliance, our independent registered public accounting firm may issue an adverse opinion due to ineffective internal controls over financial reporting and we may be subject to sanctions or investigation by regulatory authorities, such as the SEC. As a result of misstatements or restatements in our financial statements or an adverse assessment by management or auditors about the effectiveness of our internal controls, there could be a negative reaction in the financial markets due to a loss of confidence in the reliability of our financial statements. In addition, we may be required to incur costs in improving our internal controls system and the hiring of additional personnel. Any such action could negatively affect our results of operations and cash flow, harm our reputation and adversely affect the trading price of our ADSs.

We rely on search engines, which may change their business models or search engine algorithms in ways that could have a negative impact on our business, financial performance and prospects.

We use Baidu, Bing, Google, Yahoo! and other Internet search engines to generate traffic to our websites, principally through the purchase of hotel-related keywords. We obtain a significant amount of traffic via search engines and therefore utilize techniques, such as search engine optimization and search engine marketing to improve our placement in relevant search queries. Google and other search engines frequently update and change the logic that determines the placement and display of results of a user’s search. These changes could negatively affect the purchased or algorithmic placement of links to our websites. In addition, a significant amount of traffic is directed to our websites through our participation in display advertising campaigns on search engines, advertising networks, affiliate websites and social networking sites. Pricing and operating dynamics for these traffic sources can experience rapid change, both technically and competitively. Moreover, any of these providers could, for competitive or other purposes, alter their search algorithms or results, causing our websites to place lower in search results. If a major search engine changes its algorithms in a manner that negatively affects the search engine ranking, paid or unpaid, of our websites or that of our third-party distribution partners, or if competitive dynamics impact the costs or effectiveness of search engine optimization, search engine marketing or other traffic generating arrangements in a negative manner, it may have a material adverse effect on our business, results of operations, financial condition and prospects.

We rely on information technology to operate our businesses and maintain our competitiveness, and any failure to invest in and adapt to technological developments and industry trends could harm our business.

We depend on the use of sophisticated information technologies and systems, including technology and systems used for websites and apps, customer service, supplier connectivity, communications, fraud detection and administration. As our operations grow in size, scope and complexity, we need to continuously improve and upgrade our systems and infrastructure to offer an increasing number of user-enhanced services, features and functionalities, while maintaining or improving the reliability and integrity of our systems and infrastructure.

Our future success also depends on our ability to adapt our services and infrastructure to meet rapidly evolving consumer trends and demands while continuing to improve the performance, features and reliability of our service in response to competitive service offerings. The emergence of alternative platforms such as

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smartphone and tablet computing devices and the emergence of niche competitors who may be able to optimize services or strategies such platforms have required, and will continue to require, new and costly investments in technology. We may not be successful, or we may be less successful than our current or new competitors, in developing technologies that operate effectively across multiple devices and platforms and that are appealing to users, either of which would negatively impact our business and financial performance. New developments in other areas, such as cloud computing and software-as-a-service providers, could also make it easier for competitors to enter our markets due to lower up-front technology costs. In addition, we may not be able to maintain our existing systems or replace or introduce new technologies and systems as quickly as we would like or in a cost-effective manner. Failure to invest in and adapt to technological developments and industry trends may have a material adverse effect on our business, results of operations, financial condition and prospects.

If we do not continue to innovate and provide tools and services that are useful to users and advertisers, we may not remain competitive, and our revenues and results of operations could suffer.

Our success depends on continued innovation to provide features and services that make our websites and apps useful for users. Our competitors are constantly developing innovations in online hotel-related services and features. As a result, we must continue to invest significant resources in research and development in order to continuously improve the speed, accuracy and comprehensiveness of our services. We have invested, and in the future may invest, in new business strategies and services. These strategies and services may not succeed, and, even if successful, our revenues may not increase. If we are unable to continue offering innovative services, we may be unable to attract additional users and advertisers or retain our current users and advertisers, which may have a material adverse effect on our business, results of operations, financial condition and prospects.

Changes in Internet browser functionality could result in a decrease in our overall revenues.

We generate revenues, in part, by redirecting users to our advertisers’ websites. Changes in browser functionality may either prevent or limit our ability to redirect users to our advertisers. As a result, our revenue could decline if we are no longer able to offer this feature to our users.

The introduction of certain technologies may reduce the effectiveness of our services. For example, some of our services and marketing activities rely on cookies, which are placed on individual browsers when users visit websites. We use these cookies to optimize our marketing campaigns and our advertisers’ campaigns, to better understand our users’ preferences and to detect and prevent fraudulent activity. Users can block or delete cookies through their browsers or “ad-blocking” software or apps. The most common Internet browsers allow users to modify their browser settings to prevent cookies from being accepted by their browsers, or are set to block third-party cookies by default. Increased use of methods, software or apps that block cookies, or the disaffection of users resulting from our use of such marketing activities, may have an adverse effect on our business, results of operations, financial condition and prospects.

One of our product features depends in part on our relationship with third parties to provide us with consumer reviews.

Third parties provide us with consumer reviews that we provide users along with our proprietary rating score. If these third-party data providers terminate their relationships with us, the information that we provide to users may be limited or the quality of the information may suffer, which may negatively affect users’ perception of the value of our product and our reputation.

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Any significant disruption in service on our websites and apps or in our computer systems, some of which are currently hosted by third-party providers, could damage our reputation and result in a loss of users, which would harm our business and results of operations.

Our brand, reputation and ability to attract and retain users to use our websites and apps depend upon the reliable performance of our network infrastructure and content delivery processes. We have experienced interruptions in these systems in the past, including server failures that temporarily slowed down the performance of our websites and apps, and we may experience interruptions in the future. Interruptions in these systems, whether due to system failures, computer viruses or physical or electronic break-ins, could affect the security or availability of our services on our websites and apps and prevent or inhibit the ability of users to access our services. Problems with the reliability or security of our systems could harm our reputation, and damage to our reputation and the cost of remedying these problems could negatively affect our business, financial condition and results of operations.

Substantially all of the communications, network and computer hardware used to operate our website are located at facilities in the United States, Germany, Hong Kong and China. We either lease or own our servers and have service agreements with data center providers. Our systems and operations are vulnerable to damage or interruption from fire, flood, power loss, telecommunications failure, terrorist attacks, acts of war, electronic and physical break-ins, computer viruses, earthquakes and similar events. The occurrence of any of the foregoing events could result in damage to our systems and hardware or could cause them to fail completely, and our insurance may not cover such events or may be insufficient to compensate us for losses that may occur. Our systems are not completely redundant, so a failure of our system at one site could result in reduced functionality for our users, and a total failure of our systems could cause our websites or apps to be inaccessible by our users. Problems faced by our third-party service providers with the telecommunications network providers with which they contract or with the systems by which they allocate capacity among their users, including us, could adversely affect the experience of our users. Our third-party service providers could decide to close their facilities without adequate notice. Any financial difficulties, such as bankruptcy or reorganization, faced by our third-party service providers or any of the service providers with whom they contract may have negative effects on our business, the nature and extent of which are difficult to predict. If our third-party service providers are unable to keep up with our growing needs for capacity, this could have an adverse effect on our business. Any errors, defects, disruptions or other performance problems with our services could harm our reputation and may have a material adverse effect on our business, results of operations, financial condition and prospects.

We process, store and use personal data which exposes us to risks of internal and external security breaches and could give rise to liabilities, including as a result of governmental regulation and differing legal obligations applicable to data protection and privacy rights.

We may acquire personally identifiable information or confidential information from users of our websites and apps. Breaches or intrusions to our system, whether resulting from internal or external sources, could significantly harm our business. It is possible that advances in computer circumvention capabilities, new discoveries or other developments, including our own acts or omissions, could result in a compromise or breach of personally identifiable information and/or confidential user information.

We cannot guarantee that our existing security measures will prevent all security breaches, intrusions or attacks. A party, whether internal or external, that is able to circumvent our security systems could steal user information or proprietary information or cause significant disruptions to our operations. In the past, we have experienced “denial-of-service” type attacks on our system that have made portions of our website unavailable for periods of time. We may need to expend significant resources to protect against security breaches,

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intrusions, attacks or other threats or to address problems caused by breaches. Any actions that impact the availability of our website and apps could cause a loss of substantial business volume during the occurrence of any such incident and could result in reputational harm and impact negatively our ability to attract new customers and/or retain existing ones. The risk of security breaches, intrusions and other attacks is likely to increase as we expand the number of markets in which we operate and as the tools and techniques used in these types of attacks become more advanced. Security breaches could result in negative publicity, damage to our reputation, expose us to risk of loss or litigation and possible liability and subject us to regulatory penalties and sanctions as well as civil litigation. Security breaches could also cause users and potential users to lose confidence in our security, which would have a negative effect on the value of our brand.

We also face risks associated with security breaches affecting third parties conducting business over the Internet. Users generally are concerned with security and privacy on the Internet, and any publicized security problems impacting other companies could inhibit the growth of our business. Additionally, security breaches at third parties upon which we rely, such as hotels, could result in negative publicity, damage to our reputation, expose us to risk of loss or litigation and possible liability and subject us to regulatory penalties and sanctions as well as civil litigation.

We currently provide users with the option to complete certain hotel bookings by transferring users’ details directly to the hotel’s booking forms. In connection with facilitating these transactions, we receive and store certain personally identifiable information, including credit card information. This information is increasingly subject to legislation and regulations in numerous jurisdictions around the world, including throughout the member states of the European Union as a result of European Commission Directive 95/46/EC and implementing legislation in effect in member states of the European Union. Government regulation of privacy and data security is typically intended to protect the privacy of personally identifiable information that is collected, processed and transmitted in or from the governing jurisdiction. Since we collect, process and transmit personally identifiable information in and from numerous jurisdictions around the world, we are subject to privacy, data protection and data security legislation and regulations in a number of countries around the world. We could be adversely affected if we fail to comply fully with all of these requirements. In addition, we could be adversely affected if legislation or regulations are expanded to require changes in our business practices or if governing jurisdictions interpret or implement their legislation or regulations in ways that may have a material adverse effect on our business, results of operations, financial condition and prospects.

A failure to comply with current laws, rules and regulations or changes to such laws, rules and regulations and other legal uncertainties may adversely affect our business, financial performance, results of operations or business growth.

Our business and financial performance could be adversely affected by unfavorable changes in or interpretations of existing laws, rules and regulations or the promulgation of new laws, rules and regulations applicable to us and our businesses, including those relating to hotels, the Internet and online commerce, Internet advertising and price display, consumer protection, anti-corruption, anti-trust and competition, economic and trade sanctions, tax, banking, data security and privacy. As a result, regulatory authorities could prevent or temporarily suspend us from carrying on some or all of our activities or otherwise penalize us if our practices were found not to comply with applicable regulatory or licensing requirements or any binding interpretation of such requirements. Unfavorable changes or interpretations could decrease demand for our services, limit marketing methods and capabilities, affect our margins, increase costs or subject us to additional liabilities.

For example, there are, and will likely continue to be, an increasing number of laws and regulations pertaining to the Internet and online commerce that may relate to liability for information retrieved from or transmitted over the Internet, display of certain taxes and fees, online editorial and user-generated content, user privacy,

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data security, behavioral targeting and online advertising, taxation, liability for third-party activities and the quality of services. Furthermore, the growth and development of online commerce may prompt calls for more stringent consumer protection laws and more aggressive enforcement efforts, which may impose additional burdens on online businesses generally.

Likewise, the SEC, U.S. Department of Justice and U.S. Office of Foreign Assets Controls, or OFAC, as well as other foreign regulatory authorities, have continued to increase the enforcement of economic and trade regulations and anti-corruption laws, across industries. U.S. trade sanctions relate to transactions with designated foreign countries, including Cuba, Iran, Sudan and Syria, and nationals and others of those countries, as well as certain specifically targeted individuals and entities. We believe that our activities comply with OFAC trade regulations and anti-corruption regulations, including the U.S. Foreign Corrupt Practices Act and the UK Bribery Act. As regulations continue to evolve and regulatory oversight continues to increase, we cannot guarantee that our programs and policies will be deemed compliant by all applicable regulatory authorities. In the event our controls should fail or are found to be not in compliance for other reasons, we could be subject to monetary damages, civil and criminal monetary penalties, litigation and damage to our reputation and the value of our brand.

The promulgation of new laws, rules and regulations, or the new interpretation of existing laws, rules and regulations, in each case that restrict or otherwise unfavorably impact the ability or manner in which we provide hotel search services could require us to change certain aspects of our business, operations and commercial relationships to ensure compliance, which could decrease demand for services, reduce revenues, increase costs or subject the company to additional liabilities.

Application of existing tax laws, rules or regulations are subject to interpretation by taxing authorities.

The application of various national and international income and non-income tax laws, rules and regulations to our historical and new services is subject to interpretation by the applicable taxing authorities. These taxing authorities have become more aggressive in their interpretation and enforcement of such laws, rules and regulations over time, as governments are increasingly focused on ways to increase revenues. This has contributed to an increase in audit activity and harsher stances by tax authorities. As such, additional taxes or other assessments may be in excess of our current tax reserves or may require us to modify our business practices to reduce our exposure to additional taxes going forward, any of which may have a material adverse effect on our business, results of operations, financial condition and prospects.

Significant judgment and estimation is required in determining our worldwide tax liabilities. In the ordinary course of our business, there are transactions and calculations, including intercompany transactions and cross-jurisdictional transfer pricing, for which the ultimate tax determination is uncertain or otherwise subject to interpretation. Tax authorities may disagree with our intercompany charges, including the amount of or basis for such charges, cross-jurisdictional transfer pricing or other matters and assess additional taxes. Although we believe our tax estimates are reasonable, the final determination of tax audits could be materially different from our historical income tax provisions and accruals in which case we may be subject to additional tax liabilities, possibly including interest and penalties, which could have a material adverse effect on our cash flows, results of operations, financial condition and prospects.

Amendments to existing tax laws, rules or regulations or enactment of new unfavorable tax laws, rules or regulations could have an adverse effect on our business and financial performance.

Many of the underlying laws, rules or regulations imposing taxes and other obligations were established before the growth of the Internet and e-commerce. If the tax or other laws, rules or regulations were amended, or if new unfavorable laws, rules or regulations were enacted, the results could increase our tax payments or other

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obligations, prospectively or retrospectively, subject us to interest and penalties, decrease the demand for our services if we pass on such costs to the user, result in increased costs to update or expand our technical or administrative infrastructure or effectively limit the scope of our business activities if we decided not to conduct business in particular jurisdictions. As a result, these changes may have a material adverse effect on our business, results of operations, financial condition and prospects.

In addition, in the past, Germany and foreign governments have introduced proposals for tax legislation, or have adopted tax laws, that could have a significant adverse effect on our tax rate, or increase our tax liabilities, the carrying value of deferred tax assets, or our deferred tax liabilities. For example, in October 2015, the Organization for Economic Co-Operation and Development released a final package of measures to be implemented by member nations in response to a 2013 action plan calling for a coordinated multi-jurisdictional approach to “base erosion and profit shifting” by multinational companies. Multiple member jurisdictions, including the countries in which we operate, have begun implementing recommended changes such as proposed country-by-country reporting beginning as early as 2016. Additional multilateral changes are anticipated in upcoming years. Any changes to national or international tax laws could impact the tax treatment of our earnings and adversely affect our profitability. We continue to work with relevant authorities and legislators to clarify our obligations under existing, new and emerging tax laws and regulations. Our effective tax rate in the future could also be adversely affected by changes to our operating structure, changes in the mix of earnings in countries with differing statutory tax rates, changes in the valuation of deferred tax assets and liabilities, or the discontinuation of beneficial tax arrangements in certain jurisdictions.

Our global operations involve additional risks and our exposure to these risks will increase as our business continues to expand.

We operate in a number of jurisdictions and intend to continue to expand our global presence, including in emerging markets. As of September 30, 2016, we derived 38% of our total revenue from our operations in the Americas, 47% of our revenue from our operations in Developed Europe and 14% of our revenue from our operations in the Rest of World. See “ Management’s discussion and analysis of financial condition and results of operations ” for a further description of our geographical operating segments. We face complex, dynamic and varied risk landscapes in the jurisdictions in which we operate. As we enter countries and markets that are new to us, we must tailor our services and business models to the unique circumstances of such countries and markets, which can be complex, difficult, costly and divert management and personnel resources. In addition, we may face competition in other countries from companies that may have more experience with operations in such countries or with global operations in general. Laws and business practices that favor local competitors or prohibit or limit foreign ownership of certain businesses or our failure to adapt our practices, systems, processes and business models effectively to the user and supplier preferences of each country into which we expand, could slow our growth. Certain markets in which we operate have lower margins than more mature markets, which could have a negative impact on our overall margins as our revenues from these markets grow over time.

In addition to the risks outlined elsewhere in this section, our global operations are subject to a number of other risks, including:

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The results of the United Kingdom’s referendum on withdrawal from the European Union may have a negative effect on global economic conditions, financial markets and our business, which could reduce the price of our ADSs.

We are a multinational company with worldwide operations, including significant business operations in Europe. In June 2016, a majority of voters in the United Kingdom in a national referendum elected to withdraw from the European Union. The referendum was advisory, and the terms of any withdrawal are subject to a negotiation period that could last at least two years after the government of the United Kingdom formally initiates a withdrawal process. Nevertheless, the referendum has created significant uncertainty about the future relationship between the United Kingdom and the European Union, and has given rise to calls for the governments of other European Union member states to consider withdrawal.

These developments, or the perception that any of them could occur, have had and may continue to have a material adverse effect on global economic conditions and the stability of global financial markets, and could significantly reduce global market liquidity and restrict the ability of key market participants to operate in certain financial markets. Asset valuations, currency exchange rates and credit ratings may be especially subject to increased market volatility. Lack of clarity about future United Kingdom laws and regulations as the United Kingdom determines which European Union laws to replace or replicate in the event of a withdrawal could depress economic activity and restrict our access to capital. If the United Kingdom and the European Union are unable to negotiate acceptable withdrawal terms or if other European Union member states pursue withdrawal, barrier-free access between the United Kingdom and other European Union member states or among the European Economic Area overall could be diminished or eliminated. Any of these factors may have a material adverse effect on our business, results of operations, financial condition and prospects and reduce the price of our ADSs.

Our global operations expose us to risks associated with currency fluctuations, which may adversely affect our business.

We conduct a significant and growing portion of our business outside the Eurozone. As a result, we face exposure to movements in currency exchange rates around the world. These exposures include but are not limited to re-measurement gains and losses from changes in the value of foreign denominated monetary assets

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and liabilities; translation gains and losses on foreign subsidiary financial results that are translated into euros upon consolidation; fluctuations in hotel revenue and planning risk related to changes in exchange rates between the time we prepare our annual and quarterly forecasts and when actual results occur.

We do not currently hedge our foreign exchange exposure. Depending on the size of the exposures and the relative movements of exchange rates, if we choose not to hedge or fail to hedge effectively our exposure, we could experience a material adverse effect on our financial statements and financial condition. As we have seen in some recent periods, in the event of severe volatility in foreign exchange rates, these exposures can increase, and the impact on our results of operations can be more pronounced. In addition, the current environment and the increasingly global nature of our business have made hedging these exposures more complex.

We rely on the performance of highly skilled personnel, including senior management and our technology professionals, and if we are unable to retain or motivate key personnel or hire, retain and motivate qualified personnel, our business would be harmed.

We believe our success has depended, and continues to depend, on the efforts and talents of our senior management and our highly skilled team members, including our software engineers. Our future success depends on our continuing ability to attract, develop, motivate and retain highly qualified and skilled employees.

The Amended and Restated Shareholders’ Agreement contains certain provisions that could result in the departure of certain of our senior management. If the Founders, collectively, hold less than 15% of our outstanding Class A shares and Class B shares (calculated as if all securities convertible, exercisable or exchangeable for Class A shares or Class B shares had been converted, exercised or exchanged), they lose certain contractual rights to nominate members of our management board. In such case, our supervisory board may also request from the Founders, the resignation of members of the supervisory board who have been nominated by the Founders. In addition, the general meeting of shareholders, which is controlled by Expedia, has broad discretion to remove members of our management board with and without cause, irrespective of the Founders’ holdings. If the general meeting of shareholders has reasonable cause, as defined in the Amended and Restated Shareholders’ Agreement, for such removal, Expedia has the unilateral right, subject to certain exceptions, to purchase all of such member’s shares. If the Founders and other members of our management board are removed, such removal could materially adversely affect our ability to build on the efforts they have undertaken and to execute our business plan, and we may not be able to find adequate replacements. In particular, the contributions of certain key senior management are critical to our overall success.

Competition for well-qualified employees in all aspects of our business, including software engineers and other technology professionals, is intense globally. Our continued ability to compete effectively depends on our ability to attract new employees and to retain and motivate existing employees. Our software engineers and technology professionals are key to designing code and algorithms necessary to our business. If we do not succeed in attracting well-qualified employees or retaining and motivating existing employees and key senior management, it may have a material adverse effect on our business, results of operations, financial condition and prospects.

We are subject to risks associated with a corporate culture that promotes entrepreneurialism among its employees, decentralized decision making and continuous learning.

We have delegated considerable operational autonomy and responsibility to our employees, including allowing certain employees flexible working hours that allow employees to determine when, where and for how long they work. In addition, at the core of our culture is allowing our employees to grow, ensuring that they continuously accept new challenges and take on new responsibilities.

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As a consequence, we may have less experienced people in key positions, and we rotate experienced employees to other jobs within the company. As our employees have significant autonomy, this could result in poor decision making, which could have a material adverse effect on our business, results of operations, financial condition and prospects.

Our dual-class share structure with different voting rights, and certain provisions in the Amended and Restated Shareholders’ Agreement, will limit your ability as a holder of Class A shares to influence corporate matters and could discourage others from pursuing any change of control transactions that holders of our Class A shares may view as beneficial.

Prior to the completion of this offering and subject to the approval of our existing shareholders, we expect to create a dual-class share structure such that our share capital will consist of Class A shares and Class B shares. In respect of matters requiring the votes of shareholders, based on our proposed dual-class share structure, holders of Class A shares will be entitled to one vote per share, while holders of Class B shares will be entitled to ten votes per share. We and the Selling Shareholders will sell ADSs (representing Class A shares) in this offering. Each Class B share is convertible into one Class A share at any time by the holder thereof, while Class A shares are not convertible into Class B shares under any circumstances.

After completion of the post-IPO merger, assuming it occurs as contemplated, it is expected that Expedia will beneficially own approximately         %, and the Founders will own approximately         %, of the aggregate voting power of our issued and outstanding shares due to the disparate voting powers associated with our dual-class share structure, assuming the underwriters do not exercise the over-allotment option. See “ Principal and selling shareholders .” As a result of the dual-class share structure and the concentration of ownership, as well as the terms of the Amended and Restated Shareholders’ Agreement, Expedia and the Founders will have considerable influence over matters such as decisions regarding mergers, consolidations and the sale of all or substantially all of our assets, appointment and dismissal of management board members and supervisory board members and other significant corporate actions. This concentration of ownership may discourage, delay or prevent a change in control of our company, which could have the effect of depriving the holders of ADSs, (representing Class A shares) of the opportunity to receive a premium for their shares as part of a sale of our company and may reduce the price of our Class A shares. This concentrated control will limit your ability to influence corporate matters that holders of Class A shares may view as beneficial.

The requirements of being a public company may strain our resources and distract our management, which could make it difficult to manage our business, particularly after we are no longer an “emerging growth company.”

As a public company with ADSs traded on an exchange located in the United States, we will incur legal, accounting and other expenses that we did not previously incur. We will become subject to the reporting requirements of the Securities Exchange Act of 1934, as amended, or the “Exchange Act,” and the Sarbanes-Oxley Act, the listing requirements of NASDAQ, the Dutch Corporate Governance Code and other applicable securities rules and regulations. Compliance with these rules and regulations will increase our legal and financial compliance costs, make some activities more difficult, time-consuming or costly and increase demand on our systems and resources, particularly after we are no longer an “emerging growth company.” The Exchange Act requires that we file annual and current reports with respect to our business, financial condition and results of operations. The Sarbanes-Oxley Act requires, among other things, that we establish and maintain effective internal controls and procedures for financial reporting. Furthermore, the need to establish the corporate infrastructure demanded of a public company may divert our management’s attention from implementing our growth strategy, which could prevent us from improving our business, financial condition and results of operations. We have made, and will continue to make, changes to our internal controls and

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procedures for financial reporting and accounting systems to meet our reporting obligations as a public company. However, we have previously relied on experts and the measures we take may not be sufficient to satisfy our obligations as a public company. In addition, these rules and regulations will increase our legal and financial compliance costs and will make some activities more time-consuming and costly. For example, we expect these rules and regulations to make it more difficult and more expensive for us to obtain director and officer liability insurance, and we may be required to incur substantial costs to maintain the same or similar coverage. These additional obligations could have a material adverse effect on our business, financial condition, results of operations and cash flow.

In addition, changing laws, regulations and standards relating to corporate governance and public disclosure are creating uncertainty for public companies, increasing legal and financial compliance costs and making some activities more time consuming. These laws, regulations and standards are subject to varying interpretations, in many cases due to their lack of specificity, and, as a result, their application in practice may evolve over time as new guidance is provided by regulatory and governing bodies. This could result in continuing uncertainty regarding compliance matters and higher costs necessitated by ongoing revisions to disclosure and governance practices. We intend to invest resources to comply with evolving laws, regulations and standards, and this investment may result in increased general and administrative expenses and a diversion of our management’s time and attention from revenue-generating activities to compliance activities. If our efforts to comply with new laws, regulations and standards differ from the activities intended by regulatory or governing bodies due to ambiguities related to their application and practice, regulatory authorities may initiate legal proceedings against us and our business, financial condition, results of operations and cash flow could be adversely affected.

For as long as we are an “emerging growth company” under the JOBS Act, our independent registered public accounting firm will not be required to attest to the effectiveness of our internal controls over financial reporting pursuant to Section 404 of the Sarbanes-Oxley Act. We could be an emerging growth company for up to five years. Furthermore, after the date we are no longer an “emerging growth company,” our independent registered public accounting firm will only be required to attest to the effectiveness of our internal controls over financial reporting depending on our market capitalization. Even if our management concludes that our internal controls over financial reporting are effective, our independent registered public accounting firm may still decline to attest to our management’s assessment or may issue a report that is qualified if it is not satisfied with our controls or the level at which our controls are documented, designed, operated or reviewed, or if it interprets the relevant requirements differently from us. In addition, in connection with the implementation of the necessary procedures and practices related to internal controls over financial reporting, we may identify deficiencies that we may not be able to remediate in time to meet the deadline imposed by the Sarbanes-Oxley Act for compliance with the requirements of Section 404. Failure to comply with Section 404 could subject us to regulatory scrutiny and sanctions, impair our ability to grow our revenue, cause investors to lose confidence in the accuracy and completeness of our financial reports and negatively affect our share price.

We rely on the foreign private issuer and controlled company exemptions from certain corporate governance requirements under NASDAQ rules.

As a foreign private issuer whose shares are listed on NASDAQ, we are permitted to follow certain home country corporate governance practices pursuant to exemptions under NASDAQ rules. A foreign private issuer must disclose in its annual reports filed with the SEC each requirement under NASDAQ rules with which it does not comply, followed by a description of its applicable home country practice. Our Dutch home country practices may afford less protection to holders of our ADSs. We follow in certain cases our home country practices and rely on certain exemptions provided by NASDAQ rules to foreign private issuers, including, among others, an exemption from the requirement to hold an annual meeting of shareholders no later than one year after an issuer’s fiscal year end, exemptions from the requirement that a board of directors be comprised of a

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majority of independent directors, exemptions from the requirements that an issuer’s compensation committee should be comprised solely of independent directors, and exemptions from the requirement that share incentive plans be approved by shareholders. See “ Description of share capital and articles of association—Comparison of Dutch corporate law and our articles of association and U.S. corporate law ” for more information on the significant differences between our corporate governance practices and those followed by U.S. companies under NASDAQ rules. As a result of our reliance on the corporate governance exemptions available to foreign private issuers, you will not have the same protection afforded to shareholders of companies that are subject to all of NASDAQ’s corporate governance requirements.

In the event we no longer qualify as a foreign private issuer, we intend to rely on the “controlled company” exemption under NASDAQ corporate governance rules. A “controlled company” under NASDAQ corporate governance rules is a company of which more than 50% of the voting power is held by an individual, group or another company. Our principal shareholder, Expedia, controls, and following this offering will continue to control, a majority of the combined voting power of our outstanding shares, making us a “controlled company” within the meaning of NASDAQ corporate governance rules. As a controlled company, we are eligible to, and, in the event we no longer qualify as a foreign private issuer, we intend to, elect not to comply with certain of corporate governance standards, including the requirement that a majority of our supervisory board members are independent and the requirement that our compensation committee consist entirely of independent directors.

Furthermore, because we qualify as a foreign private issuer under the Exchange Act, we are exempt from certain provisions of the Exchange Act that are applicable to U.S. public companies, including (i) the sections of the Exchange Act regulating the solicitation of proxies, consents or authorizations in respect of a security registered under the Exchange Act, (ii) the sections of the Exchange Act requiring insiders to file public reports of their share ownership and trading activities and liability for insiders who profit from trades made in a short period of time and (iii) the rules under the Exchange Act requiring the filing with the SEC of quarterly reports on Form 10-Q containing unaudited financial and other specified information, or current reports on Form 8-K, upon the occurrence of specified significant events. As a result, you may not be provided with the same benefits as a holder of shares of a U.S. issuer.

We may lose our foreign private issuer status in the future, which could result in significant additional costs and expenses.

We are a “foreign private issuer,” as such term is defined in Rule 405 under the Securities Act, and therefore, we are not required to comply with all the periodic disclosure and current reporting requirements of the Exchange Act and related rules and regulations. Under Rule 405, the determination of foreign private issuer status is made annually on the last business day of an issuer’s most recently completed second fiscal quarter and, accordingly, the next determination will be made with respect to us on June 30, 2017.

In the future, we would lose our foreign private issuer status if a majority of our shareholders, directors or management continue to be U.S. citizens or residents and we fail to meet additional requirements necessary to avoid loss of foreign private issuer status. Although we have elected to comply with certain U.S. regulatory provisions, our loss of foreign private issuer status would make such provisions mandatory. If we are not a foreign private issuer, we will be required to file periodic reports and registration statements on U.S. domestic issuer forms with the SEC, which are more detailed and extensive than the forms available to a foreign private issuer. For example, the annual report on Form 10-K requires domestic issuers to disclose executive compensation information on an individual basis with specific disclosure regarding the domestic compensation philosophy, objectives, annual total compensation (base salary, bonus and equity compensation) and potential payments in connection with change in control, retirement, death or disability, while the annual report on Form

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20-F permits foreign private issuers to disclose compensation information on an aggregate basis. We will also have to mandatorily comply with U.S. federal proxy requirements, and our officers, directors and principal shareholders will become subject to the short-swing profit disclosure and recovery provisions of Section 16 of the Exchange Act. We may also be required to modify certain of our policies to comply with good governance practices associated with U.S. domestic issuers. In addition, we may lose our ability to rely upon exemptions from certain corporate governance requirements on U.S. stock exchanges that are available to foreign private issuers. Such conversion and modifications will involve additional costs and may divert our management’s attention from other business concerns, which could have a material adverse effect on our business, financial condition, results of operations and cash flows.

Litigation could distract management, increase our expenses or subject us to material money damages and other remedies.

Although we are not currently a party to any material legal proceedings, we may be involved from time to time in various legal proceedings, including, but not limited to, actions relating to breach of contract and intellectual property infringement that might necessitate changes to our business or operations. Regardless of whether any claims against us have merit, or whether we are ultimately held liable or subject to payment of damages, claims may be expensive to defend and may divert management’s time away from our operations. If any legal proceedings were to result in an unfavorable outcome, it could have a material adverse effect on our business, financial position and results of operations. Any adverse publicity resulting from actual or potential litigation may also materially and adversely affect our reputation, which in turn could adversely affect our results.

Companies in the Internet, technology and media industries are frequently subject to allegations of infringement or other violations of intellectual property rights. We are currently subject to several claims and may be subject to future claims relating to intellectual property rights. As we grow our business and expand our operations we may be subject to intellectual property claims by third parties. We plan to vigorously defend our intellectual property rights and our freedom to operate our business; however, regardless of the merits of the claims, intellectual property claims are often time consuming and extremely expensive to litigate or settle and are likely to continue to divert managerial attention and resources from our business objectives. Successful infringement claims against us could result in significant monetary liability or prevent us from operating our business or portions of our business. Resolution of claims may require us to obtain licenses to use intellectual property rights belonging to third parties, which may be expensive to procure, or we may be required to cease using intellectual property of third parties altogether. Many of our agreements with hotels, OTAs and other partners require us to indemnify these entities against third-party intellectual property infringement claims, which would increase our defense costs and may require that we pay damages if there were an adverse ruling in any such claims. Any of these events may have a material adverse effect on our business, results of operations, financial condition and prospects.

Integration of acquired assets and businesses could result in operating difficulties and other harmful consequences.

We have acquired businesses in the past, comprising myhotelshop GmbH, or myhotelshop, base7booking.com S.à r.l., or base7, and B264 GmbH, or Rheinfabrik. We expect to continue to evaluate a wide array of potential strategic transactions. We could enter into transactions that could be material to our financial condition and results of operations. The process of integrating an acquired company, business or technology may create unforeseen operating difficulties and expenditures. The areas where we face risks in respect of potential acquisitions and integrations include:

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Furthermore, companies that we have acquired, and that we may acquire in the future, may employ security and networking standards at levels we find unsatisfactory. The process of enhancing infrastructure to improve security and network standards may be time consuming and expensive and may require resources and expertise that are difficult to obtain. Acquisitions could also increase the number of potential vulnerabilities and could cause delays in detection of a security breach, or the timelines of recovery from a breach. Failure to adequately protect against attacks or intrusions could expose us to security breaches of, among other things, personal user data and credit card information that may have a material adverse effect on our business, results of operations, financial condition and prospects.

Our failure to address these risks or other problems encountered in connection with our past or future acquisitions and investments could delay or eliminate any anticipated benefits of such acquisitions or investments, incur unanticipated liabilities and may have a material adverse effect on our business, results of operations, financial condition and prospects.

Risks related to our ongoing relationship with our shareholders

Expedia controls our company and has the ability to control the direction of our business.

Expedia owned 63.5% of the economic and voting rights attributable to the shares of trivago as of September 30, 2016. Following the completion of this offering and post-IPO merger, assuming it occurs as contemplated, we expect Expedia to own         % of our Class B shares and         % of the voting power in us. As long as Expedia owns a majority of the voting power in us, and pursuant to certain rights it will be granted under the Amended and Restated Shareholders’ Agreement, Expedia will be able to control many corporate actions that require a shareholder vote.

This voting control will limit the ability of other shareholders to influence corporate matters and, as a result, we may take actions that shareholders other than Expedia do not view as beneficial. This voting control may also discourage transactions involving a change of control of our company, including transactions in which you as a holder of ADSs (representing our Class A shares) might otherwise receive a premium for your shares. Furthermore, Expedia generally has the right at any time to sell or otherwise dispose of any Class A shares and Class B shares that it owns, including the ability to transfer a controlling interest in us to a third party, without the approval of the holders of our Class A shares and without providing for the purchase of Class A shares.

The Founders have contractual rights to exert control over certain aspects of our business.

Pursuant to the Amended and Restated Shareholder’s Agreement, as long as the Founders collectively maintain at least 15% of our outstanding Class A shares and Class B shares (calculated as if all securities convertible,

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exercisable or exchangeable for Class A shares or Class B shares had been converted, exercised or exchanged), the Founders will have certain rights to veto decisions about certain corporate matters. These contractual rights will limit the ability of Expedia to control certain corporate matters and, as a result, we may fail to take actions that other shareholders may view as beneficial. This contractual control may also discourage transactions involving a change of control or sale of substantially all assets of our company, including transactions in which you as a holder of ADSs representing our Class A shares might otherwise receive a premium for your shares or dividend of proceeds representing a premium price for such assets. Furthermore, subject to certain exceptions, so long as the Founders collectively maintain at least 15% of our outstanding Class A and Class B shares (calculated as if all securities convertible, exercisable or exchangeable for Class A shares or Class B shares had been converted, exercised or exchanged), the Founders who are then serving as managing directors have the ability to select the other managing directors and, as a result, the Founders and their appointees will comprise the body that has primary day-to-day operational control of the company. In addition, from the date that Mr. Schrömgens ceases to serve as chief executive officer for a period of three years, so long as a Founder is serving as chief executive officer and there is no set of circumstances that would constitute a reasonable cause, such Founder has the right to nominate a successor in its function of chief executive officer, subject to the approval of Expedia and thereafter, the supervisory board.

Expedia’s interests may conflict with our interests, the interests of the Founders and the interests of our shareholders, and conflicts of interest between Expedia, the Founders and us could be resolved in a manner unfavorable to us and our shareholders.

Various conflicts of interest between us, the Founders and Expedia could arise. Ownership interests of directors or officers of Expedia in our shares and ownership interests of members of our management board and supervisory board in the stock of Expedia, or a person’s service as either a director or officer of both companies, could create or appear to create potential conflicts of interest when those directors and officers are faced with decisions relating to our company. In the years ended December 31, 2014 and 2015 and for the nine months ended September 30, 2015 and 2016, Expedia accounted for 32%, 39%, 39% and 35% of our revenue, respectively.

Potential conflicts of interest could also arise if we decide to enter into any new commercial arrangements with Expedia’s businesses in the future or in connection with Expedia’s desire to enter into new commercial arrangements with third parties.

Expedia has the right to pursue acquisitions of businesses that trivago may also be interested in acquiring and the right to acquire companies that may directly compete with us. Expedia may choose to pursue these corporate opportunities other than through trivago.

Furthermore, disputes may arise between Expedia and us relating to our past and ongoing relationships, and these potential conflicts of interest may make it more difficult for us to favorably resolve such disputes, including those related to:

We may not be able to resolve any potential conflicts, and even if we do, the resolution may be less favorable to us than if we were dealing with an unaffiliated party. While we are controlled by Expedia, we may not have the leverage to negotiate amendments to these agreements, if required, on terms as favorable to us as those we would negotiate with an unaffiliated third party. In addition, should Expedia choose not to guarantee any future indebtedness we may incur, the cost of such financing may increase or financing may not be available at all.

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The services that Expedia will provide to us following this offering may not be sufficient to meet our needs, which may result in increased costs and otherwise adversely affect our business.

Prior to completion of this offering, Expedia has provided us with support for shared services related to corporate functions such as legal, tax, treasury, audit and corporate development and certain server hosting and other services. Following this offering, we expect Expedia to continue to provide certain services for a fee under formal and informal arrangements described in “ Related party transactions .” However, Expedia will not be obligated to provide these services in a manner that differs from the nature of the service today, and thus we may not be able to modify these services in a manner desirable to us as a stand-alone public company. Further, if we no longer receive these services from Expedia, we may not be able to perform these services ourselves, or find appropriate third-party arrangements at a reasonable cost, and the cost may be higher than that charged by Expedia.

Risks related to our intellectual property

We may not be able to adequately protect our intellectual property, which could harm the value of our brand and adversely affect our business.

We regard our intellectual property as critical to our success, and we rely on trademark and confidentiality and license agreements to protect our proprietary rights. If we are not successful in protecting our intellectual property, it could have a material adverse effect on our business, results of operations and financial condition.

Effective trademark and service mark protection may not be available in every country in which our services are provided. The laws of certain countries do not protect proprietary rights to the same extent as the laws of the United States and, therefore, in certain jurisdictions, we may be unable to protect our proprietary technology adequately against unauthorized third-party copying or use, which could adversely affect our competitive position. We have licensed in the past, and expect to license in the future, certain of our proprietary rights, such as trademarks, to third parties. These licensees may take actions that might diminish the value of our proprietary rights or harm our reputation, even if we have agreements prohibiting such activity. Moreover, we utilize intellectual property and technology developed or licensed by third parties, and we may not be able to obtain or continue to obtain licenses and technologies from these third parties at all or on reasonable terms. Also to the extent that third parties are obligated to indemnify us for breaches of our intellectual property rights, these third parties may be unable to meet these obligations. Any of these events may have a material adverse effect on our business, results of operations, financial condition and prospects.

Claims by third parties that we infringe their intellectual property rights could result in significant costs and have a material adverse effect on our business, results of operations or financial condition.

We are currently subject to various patent and trademark infringement claims. These claims allege, among other things, that our website technology infringes upon owned patented technology and/or trademarks of third parties. If we are not successful in defending ourselves against these claims, we may be required to pay money damages, which could have an adverse effect on our results of operations. In addition, the costs associated with the defense of these claims could have an adverse effect on our results of operations. As we grow our business and expand our operations, we expect that we will continue to be subject to intellectual property claims. Resolving intellectual property claims may require us to obtain licenses to use intellectual property rights belonging to third parties, which may be expensive to procure, or we may be required to cease using intellectual property of third parties altogether. Any of these events may have a material adverse effect on our business, results of operations, financial condition and prospects.

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Confidentiality agreements with employees and others may not adequately prevent disclosure of trade secrets and other proprietary information.

A substantial amount of our processes and technologies is protected by trade secrecy laws. In order to protect these technologies and processes, we rely in part on confidentiality agreements with our employees, licensees, independent contractors and other advisors. These agreements may not effectively prevent disclosure of confidential information, including trade secrets, and may not provide an adequate remedy in the event of unauthorized disclosure of confidential information. In addition, others may independently discover our trade secrets and proprietary information, and in such cases we could not assert any trade secrecy rights against such parties. To the extent that our employees, contractors or other third parties with which we do business may use intellectual property owned by others in their work for us without our authorization, disputes may arise as to the rights in related or resulting know-how and inventions. Laws regarding trade secrecy rights in certain markets in which we operate may afford little or no protection to our trade secrets. The loss of trade secret protection could make it easier for third parties to compete with our services by copying functionality. In addition, any changes in, or unexpected interpretations of, the trade secret and other intellectual property laws in any country in which we operate may compromise our ability to enforce our trade secret and intellectual property rights. Costly and time-consuming litigation could be necessary to enforce and determine the scope of our proprietary rights, and failure to obtain or maintain trade secret protection may have a material adverse effect on our business, results of operations, financial condition and prospects.

Our use of “open source” software could adversely affect our ability to offer our services and subject us to possible litigation.

We use open source software in connection with our development. From time to time, companies that use open source software have faced claims challenging the use of open source software or compliance with open source license terms. We could be subject to suits by parties claiming ownership of what we believe to be open source software, or claiming non-compliance with open source licensing terms. Some open source licenses require users who distribute software containing open source to make available all or part of such software, which in some circumstances could include valuable proprietary code of the user. While we monitor the use of open source software and try to ensure that none is used in a manner that would require us to disclose our proprietary source code or that would otherwise breach the terms of an open source agreement, such use could inadvertently occur, in part because open source license terms are often ambiguous. Any requirement to disclose our proprietary source code or pay damages for breach of contract may have a material adverse effect on our business, results of operations, financial condition and prospects and could help our competitors develop services that are similar to or better than ours.

Risks related to ownership of our Class A shares and ADSs

Our share price may be volatile or may decline regardless of our operating performance.

The market price for our ADSs is likely to be volatile, in part because our ADSs have no history of being publicly traded. In addition, the market price of our ADSs may fluctuate significantly in response to a number of factors, most of which we cannot control, including:

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The stock markets, including NASDAQ, have experienced extreme price and volume fluctuations that have affected and continue to affect the market prices of equity securities of many Internet companies. In the past, shareholders have instituted securities class action litigation following periods of market volatility. If we were involved in securities litigation, we could incur substantial costs and our resources and the attention of management could be diverted from our business.

Seasonality may cause fluctuations in our results of operations.

Our revenues and results of operations have varied significantly from quarter to quarter because our business experiences seasonal fluctuations in the demand for our services as a result of seasonal patterns in travel. For example, hotel searches and consequently our revenue are generally the highest in the first three quarters as travelers plan and book their spring, summer and winter holiday travel. Our revenue typically decreases in the fourth quarter. We generally expect to experience higher return on advertising spend in the fourth quarter of the year as we typically elect to advertise less in the fourth quarter due to the relatively higher cost of advertising in the period. The current state of the global economic environment, combined with the seasonal nature of our business, makes forecasting future results of operations difficult. Because our business is changing and evolving, our historical results of operations may not be useful to you in predicting our future results of operations. In addition, discretionary advertising spending has historically been cyclical in nature, reflecting overall economic conditions as well as individual patterns. Our rapid growth has tended to mask the cyclicality and seasonality of our business. In the future, as our growth rate slows, we expect the cyclicality and seasonality in our business will become more pronounced and could result in material fluctuations of our revenues, cash flows, results of operations and other key performance measures from period to period and may affect the volatility of the price of our ADSs.

There has been no prior public market for our Class A shares or ADSs, and an active trading market may not develop.

Prior to this offering, there has been no public market for our Class A shares or our ADSs. An active trading market may not develop following completion of this offering or, if developed, may not be sustained. The lack of an active market may impair your ability to sell your ADSs at the time you wish to sell them or at a price that you consider reasonable. The lack of an active market may also reduce the fair market value of your ADSs. An inactive market may also impair our ability to raise capital by selling our ADSs and may impair our ability to acquire other companies by using our ADSs as consideration.

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Future sales and/or issues of our ADSs, or the perception in the public markets that these sales may occur, may depress our ADS price.

Sales of a substantial number of our ADSs in the public market, or the perception that these sales could occur, could adversely affect the price of our ADSs and could impair our ability to raise capital through the sale of additional ADSs. Upon completion of this offering, we will have              Class A shares outstanding and              Class B shares outstanding. The ADSs offered in this offering will be freely tradable without restriction under the Securities Act, except for any of our ADSs that may be held or acquired by our management board members, supervisory board members, executive officers and other affiliates, as that term is defined in the Securities Act, which will be restricted securities under the Securities Act. Restricted securities may not be sold in the public market unless the sale is registered under the Securities Act or an exemption from registration is available.

Our Selling Shareholders, Expedia, members of our supervisory board and members of our management board have agreed, subject to specified exceptions, with the underwriters not to directly or indirectly sell, offer, contract or grant any option to sell (including any short sale), pledge, transfer, establish an open “put equivalent position” within the meaning of Rule 16a-l(h) under the Exchange Act; or otherwise dispose of any ADSs, options or warrants to acquire ADSs, or securities exchangeable or exercisable for or convertible into shares or ADSs currently or hereafter owned either of record or beneficially; or publicly announce an intention to do any of the foregoing for a period of 180 days after the date of this prospectus without the prior written consent of J.P. Morgan Securities LLC. See “ Underwriting .”

All our ADSs outstanding as of the date of this prospectus may be sold in the public market by existing shareholders 180 days after the date of this prospectus, subject to applicable limitations imposed under federal securities laws. Our Class B shares are convertible into Class A shares, which may be sold subject to certain restrictions. See “ Shares eligible for future sale ” for a more detailed description of the restrictions on selling our ADSs after this offering.

In the future, we may also issue our securities in connection with investments or acquisitions. The amount of ADSs issued in connection with an investment or acquisition could constitute a material portion of our then-outstanding ADSs. Any issuance of additional securities in connection with investments or acquisitions may result in additional dilution to you.

If securities or industry analysts do not publish research or publish inaccurate or unfavorable research about our business, our ADS price and trading volume could decline.

The trading market for our ADSs will depend in part on the research and reports that securities or industry analysts publish about us or our business. If securities or industry analyst coverage results in downgrades of our ADSs or publishes inaccurate or unfavorable research about our business, our ADS price would likely decline. If one or more of these analysts cease coverage of us or fail to publish reports on us regularly, demand for our ADSs could decrease, which could cause our ADS price and trading volume to decline.

We have broad discretion over the use of proceeds we receive in this offering and may not apply the proceeds in ways that increase the value of your investment.

We will have broad discretion in the application of the net proceeds from this offering and, as a result, you will have to rely upon the judgment of our management with respect to the use of these proceeds. Our management may spend a portion or all of the net proceeds in ways that not all shareholders approve of or that may not yield a favorable return. The failure by our management to apply these funds effectively could harm our business and have an adverse effect on the market price of our ADSs.

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You may not be able to exercise your right to vote the Class A shares underlying your ADSs .

Holders of ADSs may exercise voting rights with respect to the Class A shares represented by their ADSs only in accordance with the provisions of the deposit agreement. The deposit agreement provides that, upon receipt of notice of any meeting of holders of our Class A shares, including any general meeting of our shareholders, the depositary will, as soon as practicable thereafter, fix a record date for the determination of ADS holders who shall be entitled to give instructions for the exercise of voting rights. Upon timely receipt of notice from us, the depositary shall distribute to the holders as of the record date (i) the notice of the meeting or solicitation of consent or proxy sent by us, (ii) a statement that such holder will be entitled to give the depositary instructions and a statement that such holder may be deemed, if the depositary has appointed a proxy bank as set forth in the deposit agreement, to have instructed the depositary to give a proxy to the proxy bank to vote the Class A shares underlying the ADSs in accordance with the recommendations of the proxy bank and (iii) a statement as to the manner in which instructions may be given by the holders.

You may instruct the depositary of your ADSs to vote the Class A shares underlying your ADSs. Otherwise, you will not be able to exercise your right to vote unless you withdraw our Class A shares underlying the ADSs you hold. However, you may not know about the meeting far enough in advance to withdraw those Class A shares. The depositary, upon timely notice from us, will notify you of the upcoming vote and arrange to deliver voting materials to you. We cannot guarantee that you will receive the voting materials in time to ensure that you can instruct the depositary to vote the Class A shares underlying your ADSs. In addition, the depositary and its agents are not responsible for failing to carry out voting instructions or for the manner of carrying out voting instructions. This means that you may not be able to exercise your right to vote, and there may be nothing you can do if the Class A shares underlying your ADSs are not voted as you requested.

Under the deposit agreement for the ADSs, we may choose to appoint a proxy bank. In this event, the depositary will be deemed to have been instructed to give a proxy to the proxy bank to vote the Class A shares underlying your ADSs at shareholders’ meetings if you do not vote in a timely fashion and in the manner specified by the depositary.

The effect of this proxy is that you cannot prevent the Class A shares representing your ADSs from being voted, and it may make it more difficult for shareholders to exercise influence over our company, which could adversely affect your interests. Holders of our Class A shares are not subject to this proxy.

You may not receive distributions on the Class A shares represented by our ADSs or any value for them if it is illegal or impractical to make them available to holders of ADSs.

The depositary of our ADSs has agreed to pay to you the cash dividends or other distributions it or the custodian receives on our Class A shares after deducting its fees and expenses. You will receive these distributions in proportion to the number of our Class A shares your ADSs represent. However, the depositary is not responsible if it decides that it is unlawful or impractical to make a distribution available to any holders of ADSs. We have no obligation to take any other action to permit the distribution to any holders of our ADSs or Class A shares. This means that you may not receive the distributions we make on our Class A shares or any value from them if it is illegal or impractical for us to make them available to you. These restrictions may have a material adverse effect on the value of your ADSs.

You may be subject to limitations on the transfer of your ADSs.

Your ADSs, which may be evidenced by ADRs, are transferable on the books of the depositary. However, the depositary may close its books at any time or from time to time when it deems expedient in connection with the performance of its duties. The depositary may refuse to deliver, transfer or register transfers of your ADSs

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generally when our books or the books of the depositary are closed, or at any time if we or the depositary think it is advisable to do so because of any requirement of law, government or governmental body, or under any provision of the deposit agreement, or for any other reason.

We are an “emerging growth company” and we cannot be certain whether the reduced disclosure requirements applicable to emerging growth companies will make our ADSs less attractive to investors.

We are an “emerging growth company,” as defined in the JOBS Act, and we may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not “emerging growth companies” including, but not limited to, not being required to comply with the auditor attestation requirements of Section 404 and reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements. We cannot predict if investors will find our ADSs less attractive if we rely on these exemptions. If some investors find our ADSs less attractive as a result, there may be a less active trading market for our ADSs and our ADS price may be more volatile.

We do not expect to pay any dividends for the foreseeable future.

The continued operation and growth of our business will require substantial cash. Accordingly, we do not anticipate that we will pay any dividends on our ADSs for the foreseeable future. Any determination to pay dividends in the future will be at the discretion of our management board and will depend upon our results of operations, financial condition, contractual restrictions relating to indebtedness we may incur, restrictions imposed by applicable law and other factors our management board deems relevant.

If we pay dividends, we may need to withhold tax on such dividends payable to holders of our ADSs in both Germany and the Netherlands.

As an entity incorporated under Dutch law, but with its place of effective management in Germany (and not in the Netherlands), our dividends are generally subject to German dividend withholding tax and not Dutch withholding tax. Dutch dividend withholding tax will be required to be withheld from dividends if and when paid to Dutch resident holders of our ADSs (and non-Dutch resident holders of our ADSs that have a permanent establishment in the Netherlands to which their shareholding is attributable). We will approach Dutch Revenue to apply for a tax ruling confirming that no withholding of any Dutch dividend tax is applicable at all (as the dividend withholding tax can generally be credited against a Dutch resident shareholder’s income tax anyway). Should we not obtain the tax ruling, we will be required to identify our shareholders and/or ADS holders in order to assess whether there are Dutch residents (or non-Dutch residents with a permanent establishment to which the shares are attributable) in respect of which Dutch dividend tax has to be withheld. Such identification may not always be possible in practice. If the identity of our shareholders and/or ADS holders cannot be assessed upon a payment of dividend, withholding of both German and Dutch dividend tax from such dividend may occur.

Certain of our ADS holders may be unable to claim tax credits to reduce German withholding tax applicable to the payment of dividends

We do not anticipate paying dividends on our ADSs for the foreseeable future. As a Dutch-incorporated German tax resident company, however, if we pay dividends, such dividends will be subject to German (and potentially Dutch) withholding tax. Currently, the applicable German withholding tax rate is 26.375% of the gross dividend. This German tax can be reduced to the applicable double tax treaty rate, which is generally 15%, however, by an

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application filed by the tax payer containing a specific German tax certificate with the German Federal Central Tax Office ( Bundeszentralamt für Steuern ). If a tax certificate cannot be delivered to the ADS holder due to applicable settlement mechanics or lack of information regarding the ADS holder, holders of the shares or ADSs of a German tax resident company may be unable to benefit from any available double tax treaty relief and may be unable to file for a credit of such withholding tax in its jurisdiction of residence. Further, the payment made to the ADS holder equal to the net dividend may, under the tax law applicable to the ADS holder, qualify as taxable income that is in turn subject to withholding, which could mean that a dividend is effectively taxed twice. The company is listing ADSs issued by a depositary with a direct link to the U.S. Depository Trust Company, or DTC, which should reduce the risk that the applicable German withholding tax certificate cannot be delivered to the ADS holder. However, there can be no guarantee that the information delivery requirement can be satisfied in all cases, which could result in adverse tax consequences for affected ADS holders.

Investors should note that the interpretation circular ( Besteuerung von American Depository Receipts (ADR) auf inländische Aktien ) issued by the German Federal Ministry of Finance ( Bundesministerium der Finanzen ) dated May 24, 2013 (reference number IV C 1-S2204/12/10003), which we refer to as the “ADR Tax Circular,” is not binding for German courts and it is not clear whether or not a German tax court will follow the ADR Tax Circular in determining the German tax treatment of the specific ADSs offered in this offering. Further concerns regarding the applicability of the ADR Tax Circular may arise due to the fact that the ADR Tax Circular refers only to German stock and not to shares in a Dutch N.V. If the ADSs are determined not to fall within the scope of application of the ADR Tax Circular, and thus profit distributions made with respect to the ADSs are not treated as a dividend for German tax purposes, the ADS holder would not be entitled to a refund of any taxes withheld on the dividends under German tax law. See “ Material tax considerations — German tax ation — German taxation of ADS holders. ”

Tax risks related to the corporate reorganization

As part of the pre-IPO corporate reorganization, Expedia will contribute all of its shares of trivago GmbH to travel B.V., and the Founders will contribute a portion of their shares of trivago GmbH to travel B.V., each in a capital increase in exchange for newly issued shares of travel B.V. Such contribution in kind will cause a change of control from a tax perspective and may have adverse tax impacts at the level of the subsidiaries of travel B.V. See “ Corporate structure—Corporate reorganization—Pre-IPO corporate reorganization. ”

As promptly as practicable, we will request a tax ruling from the German tax authorities to confirm the tax neutrality of the post-IPO merger from a corporate income tax perspective. In the event that such ruling would not confirm the tax neutrality to trivago GmbH or the ruling request will be rejected, it is expected that the post-IPO merger will not be consummated. In case we will not receive a tax ruling confirming the tax neutrality, the post-IPO merger will only be implemented if Expedia commits to indemnify us from all German taxes triggered as result of the post-IPO merger . O therwise the two-tier corporate structure would remain in place.

Dividends distributed by trivago GmbH/AG/SE to trivago N.V. (and to the Founders) would be subject to German withholding tax of 26.375% (including solidarity surcharge) at the level of trivago GmbH/AG/SE. At the level of the German tax resident trivago N.V., only 5% of the dividends distributed by and received from trivago GmbH/AG/SE after January 2017 would be included as taxable income subject to German corporate income tax at a tax rate of 15.825% (including solidarity surcharge) currently and trade tax ( Gewerbesteuer ) at the applicable local tax rate of around 16% currently. However, the German withholding tax deducted by trivago GmbH/AG/SE would be credited against the German corporate income tax liability of trivago N.V. and, to the extent that the German withholding tax (26.375%) exceeds the German corporate income tax liability of trivago N.V. refunded with a potential time lag of up to two years. The effective tax rate on dividends received by trivago N.V. from trivago GmbH/AG/SE would thus amount to approximately 1.6% as a result of the two-tier corporate structure.

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This additional tax of approximately 1.6% also applies on constructive dividends in case of any transactions which are not at arm’s length between trivago GmbH/AG/SE and trivago N.V. In the opposite direction any transactions that are not at arm’s length might trigger a German gift tax risk.

The two-tier corporate structure may also increase the effective tax rate of the German group if trivago N.V. lends to trivago GmbH/AG/SE proceeds received in the IPO (or a portion thereof) by way of a loan. Interest paid by trivago GmbH/AG/SE to trivago N.V. may not be fully tax deductible for trade tax and German corporate income tax purposes. trivago N.V. will nevertheless have to include the full amount of the interest payable by trivago GmbH/AG/SE as taxable income in its corporate and trade tax base. See “ German taxation—Taxation of the company (trivago N.V.)—General .”

In the event that the post-IPO merger is not carried out and the Founders are unable to place all of their shares received in trivago N.V. as result of the contribution in the secondary offering, a portion of the shares received by trivago N.V. in the contribution would be subject to a seven-year review period, during which time the Founders would have to comply with certain notification obligations under the RTA. These notification obligations include, among others, annual filings evidencing ownership of the contributed shares on each of the first seven anniversaries of the contribution. The notification obligations end at the earlier of: (i) the end of the seven-year term and (ii) the time the Founders have sold all their remaining shares in trivago N.V. Failure by the Founders to comply with these notification obligations may result in a taxable gain for trivago N.V., 5% of such capital gain would be subject to German corporate income tax at a tax rate of 15.825% (including solidarity surcharge) currently and trade tax at the applicable local tax rate of around 16% currently on the level of trivago N.V.

Also, in case a Founder exercises its put option granted under the IPO Structuring Agreement to exchange at book value shares of trivago GmbH/AG/SE for Class A shares or Class B shares of trivago N.V., the shares received by trivago N.V. in such share exchange by the respective Founder would be subject to a seven-year review period, during which the respective Founder will have to comply with the same notification obligations as described above. Accordingly, failure by the respective Founder to comply with these notification obligations may result in a taxable gain for trivago N.V. 5% of such capital gain would be subject to German corporate income tax at a tax rate of 15.825% (including solidarity surcharge) currently and trade tax at the applicable local tax rate of around 16% currently at the level of trivago N.V. However, no notification obligation needs to be fulfilled (and no related tax risk for trivago N.V. arises) in case the respective Founder immediately sells all of its trivago N.V. shares or ADSs, as applicable, received in the share exchange.

Furthermore, the expenses we incur relating to the measures described herein may be regarded as incurred for the benefit of our shareholders. In such case, tax authorities may take the view to treat such expenses as not deductible for tax purposes and assess withholding tax at a rate of up to 26.375% on respective amounts.

We may become taxable in a jurisdiction other than Germany and this may increase the aggregate tax burden on us.

Since incorporation we intend to have, on a continuous basis, our place of effective management in Germany. We will therefore be a tax resident of Germany under German national tax law. By reason of our incorporation under Dutch law, we are also deemed tax resident in the Netherlands under Dutch national tax law. However, based on our current management structure and current tax laws of the United States, Germany and the Netherlands, as well as applicable income tax treaties, and current interpretations thereof, we should be tax resident solely in Germany for the purposes of the convention between the Federal Republic of Germany and the Netherlands for the avoidance of double taxation with respect to taxes on income of 2012.

The applicable tax laws or interpretations thereof may change. Furthermore, whether we have our place of effective management in Germany and are as such tax resident in Germany is largely a question of fact and

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degree based on all the circumstances, rather than a question of law, which facts and degree may also change. Changes to applicable laws or interpretations thereof and changes to applicable facts and circumstances (e.g., a change of board members or the place where board meetings take place), may result in us becoming a tax resident of a jurisdiction other than Germany, potentially also triggering an exit tax liability in Germany. As a consequence, our overall effective income tax rate and income tax expense could materially increase, which could have a material adverse effect on our business, results of operations, financial condition and prospects, which could cause our ADS price and trading volume to decline.

The rights of shareholders in companies subject to Dutch corporate law differ in material respects from the rights of shareholders of corporations incorporated in the United States.

Upon the completion of this offering, we will be a Dutch public company with limited liability ( naamloze vennootschap ). Our corporate affairs are governed by our articles of association and by the laws governing companies incorporated in the Netherlands. The rights of shareholders and the responsibilities of members of our management board and supervisory board may be different from the rights and obligations of shareholders in companies governed by the laws of U.S. jurisdictions. In the performance of their duties, our management board and supervisory board are required by Dutch law to consider the interests of our company, its shareholders, its employees and other stakeholders. It is possible that some of these parties will have interests that are different from, or in addition to, your interests as a shareholder. See “ Description of share capital and articles of association—Comparison of Dutch corporate law and our articles of association and U.S. corporate law .”

We are not obligated to and do not comply with all the best practice provisions of the Dutch Corporate Governance Code. This may affect your rights as a shareholder.

Upon the completion of this offering, we will be a Dutch public company with limited liability ( naamloze vennootschap ) and will be subject to the Dutch Corporate Governance Code, or the DCGC. The DCGC contains both principles and best practice provisions for management boards, supervisory boards, shareholders and general meetings of shareholders, financial reporting, auditors, disclosure, compliance and enforcement standards. The DCGC applies to all Dutch companies listed on a government-recognized stock exchange, whether in the Netherlands or elsewhere, including NASDAQ.

The Dutch Corporate Governance Code is based on a “comply or explain” principle. Accordingly, companies are required to disclose in their annual reports, filed in the Netherlands whether they comply with the provisions of the Dutch Corporate Governance Code. If they do not comply with those provisions (e.g., because of a conflicting U.S. requirement), the company is required to give the reasons for such non-compliance. We do not comply with all the best practice provisions of the Dutch Corporate Governance Code.

See “ Description of share capital and articles of association—Dutch Corporate Governance Code .” This may affect your rights as a shareholder and you may not have the same level of protection as a shareholder in a Dutch company that fully complies with the Dutch Corporate Governance Code.

U.S. investors may have difficulty enforcing civil liabilities against us or members of our management board and supervisory board.

We are incorporated in the Netherlands. Most members of our management board and supervisory board are non-residents of the United States. The majority of our assets and the assets of these persons are located outside the United States. As a result, it may not be possible, or may be very difficult, to serve process on such persons or us in the United States or to enforce judgments obtained in U.S. courts against them or us based on civil liability provisions of the securities laws of the United States.

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There is no treaty between the United States and the Netherlands for the mutual recognition and enforcement of judgments (other than arbitration awards) in civil and commercial matters. Therefore, a final judgment for the payment of money rendered by any federal or state court in the United States based on civil liability, whether or not predicated solely upon the U.S. federal securities laws, would not be enforceable in the Netherlands unless the underlying claim is relitigated before a Dutch court of competent jurisdiction. Under current practice, however, a Dutch court will generally, subject to compliance with certain procedural requirements, grant the same judgment without a review of the merits of the underlying claim if such judgment (i) is a final judgment and has been rendered by a court which has established its jurisdiction vis-à-vis the relevant Dutch Companies or Dutch Company, as the case may be, on the basis of internationally accepted grounds of jurisdiction, (ii) has not been rendered in violation of elementary principles of fair trial, (iii) is not contrary to the public policy of the Netherlands, and (iv) is not incompatible with (a) a prior judgment of a Netherlands court rendered in a dispute between the same parties, or (b) a prior judgment of a foreign court rendered in a dispute between the same parties, concerning the same subject matter and based on the same cause of action, provided that such prior judgment is capable of being recognized in the Netherlands. Dutch courts may deny the recognition and enforcement of punitive damages or other awards. Moreover, a Dutch court may reduce the amount of damages granted by a U.S. court and recognize damages only to the extent that they are necessary to compensate actual losses or damages. Enforcement and recognition of judgments of U.S. courts in the Netherlands are solely governed by the provisions of the Dutch Code of Civil Procedure.

Based on the foregoing, there can be no assurance that U.S. investors will be able to enforce any judgments obtained in U.S. courts in civil and commercial matters, including judgments under the U.S. federal securities laws, against us or members of our management board and supervisory board, officers or certain experts named herein who are residents of the Netherlands or countries other than the United States. In addition, there is doubt as to whether a Dutch court would impose civil liability on us, the members of our management board and supervisory board, our officers or certain experts named herein in an original action predicated solely upon the U.S. federal securities laws brought in a court of competent jurisdiction in the Netherlands against us or such members, officers or experts, respectively. See “ Enforcement of civil liabilities .”

German and European insolvency laws are substantially different from U.S. insolvency laws and may offer our shareholders less protection than they would have under U.S. insolvency laws.

As a company with its registered office in Germany, we are subject to German insolvency laws in the event any insolvency proceedings are initiated against us including, among other things, Council Regulation (EC) No. 1346/2000 of May 29, 2000 on insolvency proceedings (which will be replaced by Regulation (EU) 2015/848 of the European Parliament and of the Council of May 20, 2015 on insolvency proceedings as of June 2017). Should courts in another European country determine that the insolvency laws of that country apply to us in accordance with and subject to such EU regulations, the courts in that country could have jurisdiction over the insolvency proceedings initiated against us. Insolvency laws in Germany or the relevant other European country, if any, may offer our shareholders less protection than they would have under U.S. insolvency laws and make it more difficult for them to recover the amount they could expect to recover in a liquidation under U.S. insolvency laws.

Dutch law and our articles of association may contain provisions that may discourage a takeover attempt.

Dutch law and provisions of our articles of association may in the future impose various procedural and other requirements that would make it more difficult for shareholders to effect certain corporate actions and would make it more difficult for a third party to acquire control of us or to effect a change in our management board and supervisory board. For example, such provisions include a dual-class share structure that gives greater voting power to the Class B shares owned by Expedia and our Founders, the binding nomination structure for

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the appointment of our management board members and supervisory board members, and the provision in our articles of association which provides that certain shareholder decisions can only be passed if proposed by our management board.

We may be classified as a passive foreign investment company, or PFIC, which could result in adverse U.S. federal income tax consequences to U.S. Holders of the ADSs.

Based on the anticipated market price of our ADSs in this offering, the expected market price of our ADSs following this offering and the composition of our income, assets and operations, we do not expect to be treated as a PFIC for U.S. federal income tax purposes for the current taxable year or in the foreseeable future. However, the application of the PFIC rules to us is subject to certain ambiguity. In addition, this is a factual determination that must be made annually after the close of each taxable year. Therefore, there can be no assurance that we will not be classified as a PFIC for the current taxable year or for any future taxable year. We would be classified as a PFIC for any taxable year if, after the application of certain look-through rules, either: (1) 75% or more of our gross income for such year is “passive income” (as defined in the relevant provisions of the Internal Revenue Code of 1986, as amended), or (2) 50% or more of the value of our assets (determined on the basis of a quarterly average) during such year is attributable to assets that produce or are held for the production of passive income. Certain adverse U.S. federal income tax consequences could apply to a U.S. Holder (as defined in “ Material tax considerations—Material U.S. federal income tax considerations ”) if we are treated as a PFIC for any taxable year during which such U.S. Holder holds ADSs.

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About this prospectus

In this prospectus, unless the context otherwise requires, the terms “we,” “us,” “our,” “trivago” and the “company” refer to trivago GmbH, travel B.V. and trivago N.V., and their respective consolidated subsidiaries, as applicable. See “ Corporate structure—Corporate reorganization .”

Presentation of financial and other information

Our financial statements included in this prospectus are presented in euros and, unless otherwise specified, all monetary amounts are in euros. All references in this prospectus to “$,” “US$,” “U.S.$,” “U.S. dollars,” “dollars” and “USD” mean U.S. dollars, and all references to “ € ” and “euros,” mean euros, unless otherwise noted. The exchange rate calculated at the noon buying rate in New York City for cable transfers in foreign currencies as certified for customs purposes by the Federal Reserve Bank in New York on the period-end date for the applicable period, which as of December 31, 2015 was € 1.00 = $1.0859 and as of September 30, 2016 was € 1.00 = $1.1238. You should not assume that, on that or any other date, one could have converted these amounts of euro into U.S. dollars at this or any other exchange rate.

We have historically conducted our business through trivago GmbH, and therefore our historical financial statements present the results of operations and financial condition of trivago GmbH and its controlled subsidiaries. Prior to the completion of this offering, we will effect the pre-IPO corporate reorganization and transactions described in “ Corporate structure—Corporate reorganization—pre-IPO corporate reorganization ,” pursuant to which travel B.V. will be converted from a private company with limited liability ( besloten vennootschap met beperkte aansprakelijkheid ) into a public limited company ( naamloze vennootschap ) under Dutch law, pursuant to a deed of amendment and conversion, and our corporate name will be changed to trivago N.V. Following the pre-IPO corporate reorganization, trivago N.V. will be the holding company of trivago GmbH and the historical consolidated financial statements of trivago GmbH included in this Registration Statement will become the historical consolidated financial statements of trivago N.V.

The historical financial statements of trivago GmbH and its controlled subsidiaries make reference to the members’ equity as trivago GmbH Class A units and trivago GmbH Class B units. The equity of a GmbH is not unitized into shares under German corporate law. However, pursuant to the company’s articles of association, we unitized members’ equity into trivago GmbH Class A units and Class B units, with each trivago GmbH Class B unit having 1/1,000 of the voting rights of a trivago GmbH Class A unit.

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Cautionary note regarding forward-looking statements

This prospectus contains forward-looking statements that relate to our current expectations and views of future events. These forward-looking statements are contained principally in the sections entitled “ Prospectus summary ,” “ Risk factors ,” “ Use of proceeds ,” “ Management’s discussion and analysis of financial condition and results of operations ” and “ Business .” These statements relate to events that involve known and unknown risks, uncertainties and other factors, including those listed under “ Risk factors ,” which may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements.

In some cases, these forward-looking statements can be identified by words or phrases such as “may,” “will,” “expect,” “anticipate,” “aim,” “estimate,” “intend,” “plan,” “believe,” “potential,” “continue,” “is/are likely to” or other similar expressions. Forward-looking statements contained in this prospectus include, but are not limited to, statements about: