CTRP Ctrip Com International Ltd

RISK FACTORS

         Investing in the ADSs involves a high degree of risk. Before you decide to buy these securities, you should carefully consider the risks described below together with the risks described in our 2015 Annual Report, and the other information contained in this prospectus supplement and the accompanying prospectus, including the documents incorporated by reference. If any of these risks actually occurs, our business, financial condition and results of operations could suffer, and you may lose all or part of your investment.

         Please see "Where You Can Find More Information About Us" and "Incorporation of Documents by Reference" for information on where you can find the documents we have filed with or furnished to the SEC and which are incorporated by reference in this prospectus supplement.

Risks Related to Our Company

Our business could suffer if we do not successfully manage current growth and potential future growth.

        Our business has grown significantly as a result of both organic growth of existing operations and acquisitions, and we expect to continue to experience such growth in the future. We have significantly expanded our operations and anticipate further expansion of our operations and workforce, as a result of the continued growth of our service offerings, customer base and geographic coverage. For example, we have invested in, and plan to continue to invest in, organic growth by rolling out new business initiatives focusing in a diverse range of areas including cruise lines, car services, bus tickets and train tickets. Consequentially, in 2014 and 2015, we invested US$374.1 million and US$508.9 million in product development, respectively. If such new business initiatives fail to perform as expected, our financial condition and results of operations could be adversely impacted. Our growth to date has placed, and our anticipated future operations will continue to place, a significant strain on our management, systems and resources. In addition to training and managing our workforce, we will need to continue to improve and develop our financial and managerial controls and our reporting systems and procedures. We cannot assure you that we will be able to efficiently or effectively manage the growth of our operations, and any failure to do so may limit our future growth and hamper our business strategy.

Strategic acquisition of complementary businesses and assets, and the subsequent integration of newly acquired business into our own, create significant challenges that may have a material adverse effect on our business, reputation, results of operations and financial condition.

        We have made and intend to continue to make strategic acquisitions in the travel industry in Greater China and overseas. For example, in October 2015, we completed a share exchange transaction with Baidu whereby we obtained approximately 45% of the aggregate voting interest of Qunar Cayman Islands Limited, or Qunar, in exchange for our newly issued ordinary shares. Subsequently, we issued ordinary shares represented by ADSs to certain special purpose vehicles holding shares solely for the benefit of certain Qunar employees and, in return, we received class B ordinary shares of Qunar from these employees. We directly injected these shares to a third-party investment entity dedicated to investing in business in China. From an accounting perspective, we consolidated the financial statements of these non-U.S. investment entities and started to consolidate Qunar's financial statements from December 31, 2015. See "Prospectus Supplement Summary—Transactions Involving Qunar Securities" for developments in 2016.

        If we are presented with appropriate opportunities, we may continue to acquire complementary businesses and assets in the future. However, strategic acquisitions and the subsequent integration of new businesses and assets into our own would require significant attention from our management and could result in a diversion of resources from our existing business, which in turn could have an adverse effect on our business operations. In addition, acquisitions could result in potential dilutive issuances of

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equity securities, use of substantial amounts of cash, and exposure to potential ongoing financial obligations and unforeseen or hidden liabilities of the acquired business. The cost and duration of, and difficulties in, integrating newly acquired businesses and managing a larger overall business could also materially exceed our expectations. Moreover, we may not be able to achieve our intended strategic strategies and record substantial impairment charges to goodwill, if we fail to successfully integrate the newly acquired business or manage a larger business. Any such negative developments could have a material adverse effect on our business, reputation, results of operations and financial condition.

Our strategy to acquire or invest in complementary businesses and assets and establish strategic alliances involves significant risk and uncertainties that may have a material adverse effect on our business, reputation, results of operations and financial condition.

        As part of our plan to expand our product and service offerings, we have made and intend to make strategic acquisitions or investments in the travel service industries in Greater China and overseas, such as the following, in addition to our transactions relating to Qunar described elsewhere in this prospectus supplement:

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In 2014 and 2015, we invested a total of US$50 million in approximately 4% stake in Tuniu Corporation, or Tuniu, a well-known service provider in the leisure package tour market, through a private placement transaction conducted concurrently with Tuniu's initial public offering and private acquisitions afterwards;



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In May 2015, we acquired a 38% equity stake in eLong, Inc., or eLong, from certain selling shareholders, including Expedia, Inc., or Expedia, together with several other investors. We subsequently participated as a member in the buying consortium in eLong's going private transaction that was completed in May 2016;



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In January 2016, we invested US$180 million in MakeMyTrip Limited, or MakeMyTrip, India's largest online travel company, via convertible bonds, and subsequently appointed a director to MakeMyTrip's board of directors; and



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In April 2016, we announced strategic collaboration with China Eastern Air Holding Company, or China Eastern Airlines, one of China's three major air transportation groups, on a broad range of products and services, and we agreed to invest RMB3 billion in the A shares of China Eastern Airlines in a private placement. Further, we may in the future invest up to 10% ownership of the shares of China Eastern Airlines, and may also nominate a representative to its board.

        If the ADS or share prices of the public companies that we have invested in or may invest in the future which are classified as available-for-sale investments decline and become lower than our share purchase price, as have happened historically, we could incur impairment loss under U.S. GAAP, which in turn would adversely affect our financial results for the relevant periods. In addition, if any of our investees in which our investments are classified as equity method investments incur a net loss in the future, we may share their net loss proportionate to our equity interest in them.

        Our strategic investments could also subject us to other uncertainties and risks, and our failure to address any of these uncertainties and risks, among others, may have a material adverse effect on our financial condition and results of operations:

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diversion of our resources and management attention;



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high acquisition and financing costs;



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failure to achieve our intended objectives or benefits in making these investments or revenue-enhancing opportunities;

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potential claims or litigation regarding our board's exercise of its duty of care and other duties required under applicable law in connection with any of our significant investments approved by the board; and



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failure to be in full compliance with applicable laws, rules and regulations.

        In particular, our strategy of acquiring or investing in a competing business could be adversely affected by uncertainties in the implementation and enforcement of the PRC Anti-Monopoly Law. Under the PRC Anti-Monopoly Law, companies undertaking acquisitions or investments in a business in China must notify the Ministry of Commerce, or MOFCOM, in advance of any transaction where the parties' revenues in the China market and global market exceed certain thresholds and the buyer would obtain control of, or decisive influence over, the target. There are numerous factors MOFCOM considers in determining "control" or "decisive influence," and, depending on certain criteria, MOFCOM will conduct anti-monopoly review of transactions in respect of which it was notified. In light of the uncertainties relating to the interpretation, implementation and enforcement of the PRC Anti-Monopoly Law, there is no assurance that MOFCOM will not deem our past and future acquisitions or investments, including the ones referenced herein or elsewhere in this prospectus supplement, to have met the filing criteria under the PRC Anti-Monopoly Law and therefore demand a filing for merger review. However, there have been limited cases of MOFCOM anti-monopoly review of filings involving companies with a variable interest entity structure similar to ours. If we are found to have violated the PRC Anti-Monopoly Law for failing to file the notification of concentration and request for review, we could be subject to a fine of up to RMB500,000, and the parts of the transaction causing the prohibited concentration could be ordered to be unwound. Such unwinding could affect our business and financial results, and harm our reputation. Further, if any of our business cooperation arrangements with Qunar are determined to have violated the PRC Anti-Monopoly Law, we could be subject to sanctions including an order to cease the relevant activaties, confiscation of illegal gains and fines of 1% to 10% of our sales revenue from the previous year.

        In addition, we establish strategic alliances with various third parties to further our business purpose from time to time. Strategic alliances with third parties could subject us to a number of risks, including risks associated with sharing proprietary information, non-performance by the counter-party, an increase in expenses incurred in establishing new strategic alliances, inefficiencies caused by failure to integrate strategic partners' businesses with our own, and unforeseen levels of diversion of our resources and management attention, any of which may materially and adversely affect our business.

        As a result of any of the above factors, any actual or perceived failure to realize the benefits we expected from these investments may materially and adversely affect our business and financial results and cause the trading price of our ADSs to decline.

Consolidation of the results of operations of Qunar with ours may negatively impact our financial performance and results of operations.

        Our acquisition of Qunar shares as a consideration for our share exchange transaction with Baidu in October 2015 and share issuance for the benefit of Qunar employees in December 2015 is accounted for as a business combination under U.S. GAAP, and as a result, we began to consolidate Qunar's financial statements from an accounting perspective, starting from December 31, 2015. See "Prospectus Supplement Summary—Transactions Involving Qunar Securities" for developments in 2016. Qunar has historically incurred net loss and it recorded a net loss of RMB1,775 million (US$267 million) for the six months ended June 30, 2016, and a significant portion of our net loss is attributable to Qunar's net loss for this period. See "Management's Discussion and Analysis of Financial Condition and Results of Operations—Results of Operations". Our net loss increased significantly from RMB84.6 million for the six months ended June 30, 2015 to RMB2.3 billion (US$341 million) for the six months ended June 30, 2016. Consolidation of Qunar's financial statements has negatively impacted our financial statements

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and may continue to negatively impact our financial performance in the upcoming financial reporting cycles for an extended period of time. If Qunar is not able to reduce or narrow its net losses, our consolidated results of operations will continue to be materially and adversely affected by the consolidation of Qunar. Moreover, starting in January 2016, some PRC airlines, including four of the largest airlines in China, announced suspension of their respective business cooperation with Qunar without indicating the length of such suspension and cited serious customer complaints in their respective announcements. Although two of these PRC airlines subsequently resumed cooperation with Qunar in June 2016, if such suspension further exacerbates, Qunar may suffer from losses of revenue and its results of operations may be materially and adversely affected, which in turn may materially and adversely affect our consolidated results of operations. Similar incidences and other risks that are unique and specific to Qunar's business operations, rather than the travel industry as a whole, may also materially and adversely affect our consolidated results of operations. See "—If Qunar fails to effectively implement and execute its strategies to maintain competitiveness and grow its business, our business, results of operations and financial condition may be materially and adversely affected." The pro forma financial statements giving effect to the business combination under the U.S. GAAP are included in Exhibit 99.3 to our current report on Form 6-K furnished to the SEC on September 6, 2016, which is incorporated by reference in this prospectus supplement.

If Qunar fails to effectively implement and execute its strategies to maintain competitiveness and grow its business, our business, results of operations and financial condition may be materially and adversely affected.

        As a result of the transactions described elsewhere in this prospectus supplement involving Qunar securities during 2015, we began to consolidate Qunar's financial results from December 31, 2015 from an accounting perspective under U.S. GAAP. Historically, Qunar enjoyed one of the market leading positions in China's travel industry with its unique business model as a search-based travel commerce platform, while it is currently transitioning into a mobile and online commerce travel platform which focuses on providing a one-stop solution for users. Certain risks and uncertainties associated with the business operations of Qunar are distinct from those we have faced historically:

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Failure to transition into a one-stop mobile and online commerce travel platform from a search-based platform. As part of the transitioning effort, Qunar's product development and product headcount has increased significant in recent years as a result of its focus on development of its mobile platform and hotel direct business;



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Failure to increase penetration into hotel business in lower-tier cities, and maintain and increase popularity among young users in China by offering attractive features and services to meet user requirements of those markets;



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Failure to maintain relationships with air ticket suppliers, such as major airlines and China's sole global distribution systems, from which Qunar retrieves ticket availability information in order to generate comprehensive and accurate flight information on its platform;



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Failure to maintain and strengthen relationships with online travel agents that are Qunar's existing customers, and establish new customer relationships with other online travel agents and travel service providers to ensure that it has access to a steady supply of travel product information on favorable commercial terms;



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Failure to adequately monitor and secure service quality of travel service providers on its platform, and address user dissatisfaction with travel service providers;



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Consolidation of the fragmented travel market in China, which may result in travel service providers becoming fewer but larger, comprehensive travel information more readily available to users, and a potential loss to the value of Qunar's business as a travel service platform; and

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Inability to maintain or increase awareness and preference of its brand "Qunar" as a result of failure to provide a compelling user experience of online travel searches, maintaining the quality of its services, and preserving Qunar's reputation and goodwill in the event of negative media publicity toward its services, internet security or other issues affecting Qunar or online travel businesses in China.

        If Qunar is unable to successfully implement and execute its strategies to maintain competitiveness and grow its business, or effectively address risks and uncertainties associated with its business operations and transitioning efforts, our business, results of operations and financial condition may be materially and adversely affected.

Our transactions involving issuance of our shares as consideration and investment or financing arrangements with selected third-party investment entities may result in substantial dilution to our shareholders and may also reduce our existing cash balance and adversely affect our working capital.

        In the long-term interest of our company, we make investments, in the form of limited partnership contributions, assets injection or other financing arrangements, into or with certain entities that are dedicated to investing businesses in China. In late 2015 and early 2016, we agreed to make investment or enter into financing arrangements with several non-U.S. investment entities, which are managed and/or owned by parties unaffiliated with each other and unaffiliated with us and are dedicated to investing in businesses in China. As of the date of this prospectus supplement, we issued a total number of 5,827,089 ordinary shares, including 3,057,073 ordinary shares represented by ADSs, and provided capital contribution or financial support in a total amount of approximately US$1.3 billion in cash to some of these non-U.S. investment entities. These investments, capital contributions and financing arrangements together with the share exchange with Baidu and issuance of shares for the benefit of Qunar employees historically caused significant dilution to our existing shareholders and impacted our working capital. Transactions involving issuance of a substantial number of our ordinary shares such as the transactions contemplated hereunder may result in substantial dilution to our shareholders. In addition, future sale of our shares by these non-U.S. investment entities and/or our other significant shareholders such as Baidu may cause our share price to decline. Furthermore, if we obtain debt financings, we may be subject to restrictive covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends.

Our business is sensitive to global economic conditions. A severe or prolonged downturn in the global or Chinese economy may have a material and adverse effect on our business, and may materially and adversely affect our growth and profitability.

        The global macroeconomic environment is facing challenges, including the escalation of the European sovereign debt crisis since 2011, the end of quantitative easing by the U.S. Federal Reserve and the economic slowdown in the Eurozone in 2014. There have been concerns over unrest in the Middle East and Africa, which have resulted in volatility in oil and other markets. In June 2016, British citizens voted in a referendum to withdraw the membership of the United Kingdom from the European Union. The result of the vote caused instant and significant volatility in the global financial and securities markets. The various uncertainties in the political and economic situations of the United Kingdom and the European Union arising from the anticipated withdrawal may have a negative and prolonged impact on the global economy.

        Economic conditions in China are sensitive to global economic conditions. Our business and operations are primarily based in China and the majority of our revenues are derived from our operations in China. Accordingly, our financial results have been, and are expected to continue to be, affected by the economy and travel industry in China. While the economy in China has grown significantly over the past decades, growth has been uneven, both geographically and among various

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sectors of the economy, and the rate of growth has been slowing. Any severe or prolonged slowdown in the global and/or Chinese economy could reduce expenditures for travel, which in turn may adversely affect our operating results and financial condition. According to the National Bureau of Statistics of China, in 2015, the growth rate of China's gross domestic product was 6.9% and it is unclear how the economy will fare in 2016 and beyond. Since we derive the majority of our revenues from accommodation reservation, transportation ticketing and packaged-tour services in China, any severe or prolonged slowdown in the global and/or Chinese economy or the recurrence of any financial disruptions may materially and adversely affect our business, operating results and financial condition in a number of ways. For example, the weakness in the economy could erode consumer confidence which, in turn, could result in changes to consumer spending patterns relating to travel products and services. If consumer demand for travel products and services we offer decreases, our revenues may decline. Furthermore, continued turbulence in the international markets may adversely affect our ability to access the capital markets to meet liquidity needs.

General declines or disruptions in the travel industry may materially and adversely affect our business and results of operations.

        Our business is significantly affected by the trends that occur in the travel industry in China, including the hotel, transportation ticketing and packaged-tour sectors. As the travel industry is highly sensitive to business and personal discretionary spending levels, it tends to decline during general economic downturns. The recent worldwide recession has led to a weakening in the demand for travel services. Other trends or events that tend to reduce travel and are likely to reduce our revenues include:

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terrorist attacks or threats of terrorist attacks or wars, particularly given the recent attacks in Paris and the worsening situation in Syria;



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an outbreak of H1N1 influenza, Ebola virus, avian flu, Middle East respiratory syndrome, or MERS, severe acute respiratory syndrome, or SARS, or any other serious contagious diseases;



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increased prices in the hotel, transportation ticketing, or other travel-related sectors;



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increased occurrence of travel-related accidents;



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political unrest;



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natural disasters or poor weather conditions; and



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any travel restrictions or other security procedures implemented in connection with any major events in China.

        We could be severely and adversely affected by declines or disruptions in the travel industry and, in many cases, have little or no control over the occurrence of such events. Such events could result in a decrease in demand for our travel services. This decrease in demand, depending on the scope and duration, could significantly and adversely affect our business and financial performance over the short and long term.

We recorded a significant amount of goodwill and indefinite lived intangible assets in connection with our strategic acquisitions and investments, and we may incur material impairment charges to our goodwill and indefinite lived intangible assets if the recoverability of these assets become substantially reduced.

        In connection with our recent strategic acquisitions, there has been a significant increase of goodwill and indefinite lived intangible assets booked in our financial statements. As of June 30, 2016, our goodwill was RMB46.4 billion (US$7.0 billion) and our indefinite lived intangible assets were RMB9.7 billion (US$1.5 billion), compared to RMB2.5 billion and RMB651 million, respectively, as of June 30, 2015. In 2015, our acquisition of Qunar securities resulted in an RMB43.0 billion increase in

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our goodwill. ASC 350 "Intangibles—Goodwill and Other" provides that intangible assets that have indefinite useful lives and goodwill will not be amortized but rather will be tested at least annually for impairment. ASC 350 also requires that long-lived assets be reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable from its undiscounted future cash flow. For 2013, 2014, 2015 and the six months ended June 30, 2016, we did not recognize any impairment charges for goodwill or intangible assets. If different judgments or estimates had been utilized, however, material differences could have resulted in the amount and timing of the impairment charge. We may potentially incur significant impairment charges if the recoverability of these assets become substantially reduced in the future. Any such impairment charges would adversely affect our results of operations and financial condition.

The trading price of our ADSs has been volatile historically and may continue to be volatile regardless of our operating performance.

        The trading price of our ADSs has been and may continue to be subject to wide fluctuations. In 2015, the trading prices of our ADSs on the NASDAQ Global Select Market, as adjusted retrospectively for all periods presented to reflect the current ADS to ordinary share ratio of eight (8) ADSs representing one ordinary share effective on December 1, 2015, have ranged from US$21.54 to US$57.36 per ADS, and the last reported trading price on September 6, 2016 was US$45.96 per ADS. The price of our ADSs may fluctuate in response to a number of events and factors, including the following:

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actual or anticipated fluctuations in our quarterly operating results;



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changes in financial estimates by securities analysts;



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conditions in the Internet or travel industries;



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changes in the economic performance or market valuations of other Internet or travel companies or other companies that primarily operate in China;



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changes in major business terms between our travel suppliers and us;



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announcements by us or our competitors of new products or services, significant acquisitions, strategic partnerships, joint ventures or capital commitments;



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additions or departures of key personnel; and



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market and volume fluctuations in the stock market in general.

        In addition, the stock market in general, and the market prices for Internet-related companies and companies with operations in China in particular, have experienced volatility that often has been unrelated to the operating performance of such companies. The securities of some China-based companies that have listed their securities in the United States have experienced significant volatility since their initial public offerings, including, in some cases, substantial price declines in the trading prices of their securities. The trading performances of the securities of these China-based companies after their offerings and the recent surge in the number of China-based, U.S.-listed companies that commenced going private proceedings may affect the attitudes of investors toward Chinese companies listed in the United States, which consequently may impact the trading performance of the ADSs, regardless of our actual operating performance. Furthermore, some negative news and perceptions about inadequate corporate governance practices or fraudulent accounting, corporate structure including the use of variable interest entities or other matters of other China-based companies have negatively affected the attitudes of investors towards China-based companies, including us, in general in the past, regardless of whether we have engaged in any inappropriate activities, and any news or perceptions with a similar nature may continue to negatively affect us in the future. In addition, the global financial crisis and the ensuing economic recessions in many countries have contributed and may

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continue to contribute to extreme volatility in the global stock markets, such as the large decline in share prices in the United States, China and other jurisdictions in recent years. These broad market and industry fluctuations may continue to adversely affect the price of the ADSs, regardless of our operating performance. Additionally, volatility or a lack of positive performance in our stock price may adversely affect our ability to retain key employees, all of whom have been granted share-based awards.

If we are unable to maintain existing relationships with travel suppliers and strategic alliances, or establish new arrangements with travel suppliers and strategic alliances at or on favorable terms or at terms similar to those we currently have, or at all, our business, market share and results of operations may be materially and adversely affected.

        We rely on travel suppliers (including without limitation hotels and domestic and international airlines) to make their services available to consumers through us, and our business prospects depend on our ability to maintain and expand relationships with travel suppliers. If we are unable to maintain satisfactory relationships with our existing travel suppliers, or if our travel suppliers establish similar or more favorable relationships with our competitors, or if our travel suppliers increase their competition with us through their direct sales, or if any one or more of our travel suppliers significantly reduce participation in our services for a sustained period of time or completely withdraw participation in our services, our business, market share and results of operations may be materially and adversely affected. To the extent any of those major or popular travel suppliers ceased to participate in our services in favor of one of our competitors' systems or decided to require consumers to purchase services directly from them, our business, market share and results of operations may suffer.

        Our business depends significantly upon our ability to contract with hotels in advance for the guaranteed availability of certain hotel rooms. We rely on hotel suppliers to provide us with rooms at discounted prices. However, our contracts with our hotel suppliers are not exclusive and most of the contracts must be renewed semi-annually or annually. We cannot assure you that our hotel suppliers will renew our contracts in the future on favorable terms or terms similar to those we currently have agreed. The hotel suppliers may reduce the commission rates on bookings made through us. Furthermore, in order to maintain and grow our business and to effectively compete with many of our competitors in all potential markets, we will need to establish new arrangements with hotels and accommodations of all ratings and categories in our existing markets and in new markets. We cannot assure you that we will be able to identify appropriate hotels or enter into arrangements with those hotels on favorable terms, if at all. This failure could harm the growth of our business and adversely affect our operating results and financial condition, which consequently will impact the price of our ADSs.

        We derive revenues and other significant benefits from our arrangements with major domestic airlines in China and international airlines. Our airline ticket suppliers allow us to book and sell tickets on their behalf and collect commissions on tickets booked and sold through us. Although we currently have supply relationships with these airlines, they also compete with us for ticket bookings and have entered into similar arrangements with many of our competitors and may continue to do so in the future. Such arrangements may be on better terms than we have. Starting in January 2016, some PRC airlines, including four of the largest airlines in China, announced suspension of their respective business cooperation with Qunar without indicating the length of such suspension and cited serious customer complaints in their respective announcements. Although two of these airlines have resumed cooperation with Qunar since June 2016, if any airlines choose to take similar actions against us and additional airlines follow suit, our business, market share and results of operations may be materially and adversely affected. We cannot assure you that any of these airlines will continue to have supplier relationships with us or pay us commissions at the same or similar rates as what they paid us in the past. Further, on July 1, 2016, the four largest airlines in China announced that third-party ticketing agents are prohibited from selling tickets for domestic flights on third-party platforms, such as ours. Additionally, on July 1, most major domestic airlines also replaced their commissions and rebate incentives completely with a fixed "admin fee" per ticket. The loss of supplier relationships or further adverse changes in major business terms with our travel suppliers would materially impair our operating results and financial condition as we would lose an increasingly significant source of our revenues.

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        Part of the revenues that we derive from our hotel suppliers, airline ticket suppliers and other travel service providers are obtained through our strategic alliances with various third parties. We cannot assure you, however, that we will be able to successfully establish and maintain strategic alliances with third parties which are effective and beneficial for our business. Our inability to do so could have a material adverse effect on our market penetration, revenue growth and profitability.

If we fail to further increase our brand recognition, we may face difficulty in maintaining existing and acquiring new customers and business partners and our business may be harmed.

        We believe that maintaining and enhancing the Ctrip brand depends in part on our ability to grow our customer base and obtain new business partners. Some of our potential competitors already have well-established brands in the travel industry. The successful promotion of our brand will depend largely on our ability to maintain a sizeable and active customer base, maintain relationships with our business partners, provide high-quality customer service, properly address customer needs and handle customer complaints and organize effective marketing and advertising programs. If our customer base significantly declines or grows more slowly than our key competitors, the quality of our customer services substantially deteriorates, or our business partners cease to do business with us, we may not be able to cost-effectively maintain and promote our brand, and our business may be harmed.

If we do not compete successfully against new and existing competitors, we may lose our market share, and our business may be materially and adversely affected.

        We compete primarily with other consolidators of hotel accommodations and transportation reservation services based in China. We also compete with traditional travel agencies and new Internet travel search websites. In the future, we may also face competition from new players in the hotel consolidation market in China and abroad that may enter China.

        We may face more competition from hotels and airlines as they enter the discount rate market directly or through alliances with other travel consolidators. In addition, international travelers have become an increasingly important customer base. Competitors that have formed stronger strategic alliances with overseas travel consolidators may have more effective channels to address the needs of customers in China to travel overseas. Furthermore, we do not have exclusive arrangements with our travel suppliers. The combination of these factors means that potential entrants to our industry face relatively low entry barriers.

        In the past, certain competitors launched aggressive advertising campaigns, special promotions and engaged in other marketing activities to promote their brands, acquire new customers or to increase their market shares. In response to such competitive pressure, we started to take and may continue to take similar measures and as a result will incur significant expenses, which in turn could negatively affect our operating margins in the quarters or years when such promotional activities are carried out. For example, we launched a promotion program in recent years to offer certain selected transportation tickets, hotel rooms and package tours as well as grant of e-coupons to our customers in response to promotion campaigns that our competitors have launched. Primarily as a result of the enhanced marketing efforts and additional investment in product developments in response to the intensified market competition, our operational margin was negatively affected. In addition, some of our existing and potential competitors may have competitive advantages, such as significantly larger active user base on mobile or other online platforms, greater financial, marketing and strategic relationships and alliances or other resources or name recognition, and may be able to imitate and adopt our business model. We cannot assure you that we will be able to successfully compete against new or existing competitors. In the event we are not able to compete successfully, our business, results of operations and profit margins may be materially and adversely affected.

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Our quarterly results are likely to fluctuate because of seasonality in the travel industry in Greater China.

        Our business experiences fluctuations, reflecting seasonal variations in demand for travel services. For example, the first quarter of each year generally contributes the lowest portion of our annual net revenues primarily due to a slowdown in business activity around and during the Chinese New Year holiday, which occurs during the period. Consequently, our results of operations may fluctuate from quarter to quarter.

Any failure to maintain the satisfactory performance of our mobile platform, websites and systems, particularly those leading to disruptions in our services, could materially and adversely affect our business and reputation, and our business may be harmed if our infrastructure or technology is damaged or otherwise fails or becomes obsolete.

        The satisfactory performance, reliability and availability of our infrastructure, including our mobile platform, websites and systems, are critical to the success of our business. Any system interruptions that result in the unavailability or slowdown of our mobile platform, websites or other systems and the disruption in our services could reduce the volume of our business and make us less attractive to customers. Substantially all of our computer and communications systems are located at two customer service centers, one in Shanghai and the other one in Nantong, China. Our technology platform and computer and communication systems are vulnerable to damage or interruption from human error, computer viruses, fire, flood, power loss, telecommunications failure, physical or electronic break-ins, hacking or other attempts at system sabotage, vandalism, natural disasters and other similar events. For example, in May 2015, we experienced a network shut-down for a few hours, leading to temporary disruptions in the operations of our mobile platform and websites and interrupted customer services; later internal investigations revealed the cause to be employee human error. No data leakage occurred as part of the May 2015 incident, and we have since implemented extensive measures to ensure prompt responses to similar future incidents of network shutdown/service disruption and to continue to update our security mechanisms to protect our systems from any human error, third-party intrusions, viruses or hacker attacks, information or data theft or other similar activities; however, we cannot assure you that unexpected interruptions to our systems will not occur again in the future. We do not carry business interruption insurance to compensate us for losses that may occur as a result of such disruptions. In addition, any such future occurrences could reduce customer satisfaction levels, damage our reputation and materially and adversely affect our business.

        We use an internally developed booking software system that supports nearly all aspects of our booking transactions. Our business may be harmed if we are unable to upgrade our systems and infrastructure quickly enough to accommodate future traffic levels, avoid obsolescence or successfully integrate any newly developed or purchased technology with our existing system. Capacity constraints could cause unanticipated system disruptions, slower response times, poor customer service, impaired quality and speed of reservations and confirmations and delays in reporting accurate financial and operating information. These factors could cause us to lose customers and suppliers, which would have a material adverse effect on our results of operations and financial condition.

        In addition, our future success will depend on our ability to adapt our products and services to the changes in technologies and Internet user behavior. For example, the number of people accessing the internet through mobile devices, including smart devices, mobile phones, tablets and other hand-held devices, has increased in recent years, and we expect this trend to continue while 3G, 4G and more advanced mobile communications technologies are broadly implemented. As we make our services available across a variety of mobile operating systems and devices, we are dependent on the interoperability of our services with popular mobile devices and mobile operating systems that we do not control, such as Android, iOS and Windows. Any changes in such mobile operating systems or devices that degrade the functionality of our services or give preferential treatment to competitive services could adversely affect usage of our services. Further, if the number of platforms for which we

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develop our services increases, which is typically seen in a dynamic and fragmented mobile services market such as China, it will result in an increase in our costs and expenses. In order to deliver high quality services, it is important that our services work well across a range of mobile operating systems, networks, mobile devices and standards that we do not control. If we fail to develop products and technologies that are compatible with all mobile devices and operating systems, or if the products and services we develop are not widely accepted and used by users of various mobile devices and operating systems, we may not be able to penetrate the mobile Internet market. In addition, the widespread adoption of new internet technologies or other technological changes could require significant expenditures to modify or integrate our products or services. If we fail to keep up with these changes to remain competitive, our future success may be adversely affected.

Our business depends substantially on the continuing efforts of our key executives, and our business may be severely disrupted if we lose their services.

        Our future success depends heavily upon the continued services of our key executives. We rely on their expertise in business operations, finance and travel services and on their relationships with our suppliers, shareholders, and business partners. We do not maintain key-man life insurance for any of our key executives. If one or more of our key executives are unable or unwilling to continue in their present positions, we may not be able to easily replace them. In that case, our business may be severely disrupted, we may incur additional expenses to recruit and train personnel and our financial condition and results of operations may be materially and adversely affected.

        In addition, if any of these key executives joins a competitor or forms a competing company, we may lose customers and suppliers. Each of our executive officers has entered into an employment agreement with us that contains confidentiality and non-competition provisions. If any disputes arise between our executive officers and us, we cannot assure you of the extent to which any of these agreements would be enforced in China, where most of these executive officers reside and hold most of their assets, in light of the uncertainties with China's legal system. See "—Risks Related to Doing Business in China—Uncertainties with respect to the PRC legal system could adversely affect us."

If we are unable to attract, train and retain key individuals and highly skilled employees, our business may be adversely affected.

        If our business continues to expand, we will need to hire additional employees, including travel supplier management personnel to maintain and expand our travel supplier network, information technology and engineering personnel to maintain and expand our mobile platform, websites, customer service centers and systems, and customer service representatives to serve an increasing number of customers. If we are unable to identify, attract, hire, train and retain sufficient employees in these areas, users of our mobile platform, websites and customer service centers may not have satisfactory experiences and may turn to our competitors, which may adversely affect our business and results of operations.

The PRC government regulates the air-ticketing, travel agency and Internet industries. If we fail to obtain or maintain all pertinent permits and approvals or if the PRC government imposes more restrictions on these industries, our business may be adversely affected.

        The PRC government regulates the air-ticketing, travel agency and Internet industries. We are required to obtain applicable permits or approvals from different regulatory authorities to conduct our business, including separate licenses for value-added telecommunications, air-ticketing and travel agency activities. If we fail to obtain or maintain any of the required permits or approvals in the future, we may be subject to various penalties, such as fines or suspension of operations in these regulated businesses, which could severely disrupt our business operations. As a result, our financial condition and results of operations may be adversely affected.

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        In particular, the Civil Aviation Administration of China, or CAAC, together with National Development and Reform Commission, or NDRC, regulates pricing of air tickets. CAAC also supervises commissions payable to air-ticketing agencies together with China National Aviation Transportation Association, or CNATA. If restrictive policies are adopted by CAAC, NDRC, or CNATA, or any of their regional branches, our air-ticketing revenues may be adversely affected.

We may not be able to prevent others from using our intellectual property, which may harm our business and expose us to litigation.

        We regard our domain names, trade names, trademarks and similar intellectual property as critical to our success. We try to protect our intellectual property rights by relying on trademark protection and confidentiality laws and contracts. Trademark and confidentiality protection in China may not be as effective as that in the United States. Policing unauthorized use of proprietary technology is difficult and expensive.

        The steps we have taken may be inadequate to prevent the misappropriation of our proprietary technology. Any misappropriation could have a negative effect on our business and operating results. Furthermore, we may need to go to court to enforce our intellectual property rights. Litigation relating to our intellectual property might result in substantial costs and diversion of resources and management attention. See "—Risks Related to Doing Business in China—Uncertainties with respect to the PRC legal system could adversely affect us."

We rely on services from third parties to carry out our business and to deliver our products to customers, and if there is any interruption or deterioration in the quality of these services, our customers may not continue using our services.

        We rely on third-party computer systems to host our websites, as well as third-party licenses for some of the software underlying our technology platform. In addition, we rely on third-party transportation ticketing agencies to issue transportation tickets and travel insurance products, confirmations and deliveries in some cities in Greater China. We also rely on third-party local operators to deliver on-site services to our packaged-tour customers. Any interruption in our ability to obtain the products or services of these or other third parties or deterioration in their performance, such as server errors or interruptions, or dishonest business conduct, could impair the timing and quality of our own service. If our service providers fail to provide high quality services in a timely manner to our customers or violate any applicable rules and regulations, our services will not meet the expectations of our customers and our reputation and brand will be damaged. Furthermore, if our arrangement with any of these third parties is terminated, we may not find an alternative source of support on a timely basis or on favorable terms to us.

If our hotel suppliers or customers provide us with untrue information regarding our customers' stay, we may not be able to recognize and collect revenues to which we are entitled.

        A substantial portion of our revenues are represented by commissions paid by hotels for room nights booked through us. Generally, we do not receive payment from our customers on behalf of our hotel suppliers, as our customers pay hotels directly. To confirm whether a customer adheres to the booked itinerary, we routinely make inquiries with the hotel and, occasionally, with the customer. We rely on the hotel and the customer to provide us truthful information regarding the customer's check-in and check-out dates, which forms the basis for calculating the commission we are entitled to receive from the hotel. If our hotel suppliers or customers provide us with untrue information with respect to our customers' length of stay at the hotels, we would not be able to collect revenues to which we are entitled. In addition, using such untrue information may lead to inaccurate business projections and plans, which may adversely affect our business planning and strategy.

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We may suffer losses if we are unable to predict the amount of inventory we will need to purchase during the peak holiday seasons.

        During the peak holiday seasons in China, we establish limited merchant business relationships with selected travel service suppliers, particularly for our packaged-tour products, in order to secure adequate supplies for our customers. In the merchant business relationship, we buy hotel rooms and/or transportation tickets before selling them to our customers and thereby incur inventory risk. If we are unable to correctly predict demand for hotel rooms and transportation tickets that we are committed to purchase, we would be responsible for covering the cost of the hotel rooms and transportation tickets we are unable to sell, and our financial condition and results of operations would be adversely affected.

The recurrence of SARS or other similar outbreaks of contagious diseases as well as natural disasters may materially and adversely affect our business and operating results.

        In early 2003, several regions in Asia, including Hong Kong and China, were affected by the outbreak of SARS. The travel industry in China, Hong Kong and some other parts of Asia suffered tremendously as a result of the outbreak of SARS. Furthermore, in early 2008, severe snowstorms hit many areas of China and particularly affected southern China. The travel industry was severely and adversely affected during and after the snowstorms. Additionally, in May 2008, a major earthquake struck China's populous Sichuan Province, causing great loss of life, numerous injuries, property loss and disruption to the local economy. The earthquake had an immediate impact on our business as a result of the sharp decrease in travel in the relevant earthquake-affected areas in Sichuan Province. In 2009, an outbreak of H1N1 influenza (swine flu) occurred in Mexico and the United States and human cases of the swine flu were discovered in China and Hong Kong. In March 2011, a powerful earthquake hit Japan, and the subsequent tsunami and nuclear accidents had far-reaching impact on the surrounding economies. Starting from March 2013, H7N9 bird flu, a new strain of animal influenza, has been spreading in China and has infected more than a hundred people. In October 2013, large scale political protests began in Thailand that lasted several months and caused disruption to tourism and travel. In November 2013, one of the largest typhoons ever recorded hit the Philippines, causing widespread devastation. In March 2014, the World Health Organization, or the WHO, reported a major Ebola outbreak in Guinea, a western African nation. The disease then rapidly spread to the neighboring countries of Liberia and Sierra Leone. As of February 3, 2015, 22,560 suspected cases and 9,019 deaths had been reported; however, the WHO has said that these numbers may be underestimated. In June 2015, an outbreak of Middle East respiratory syndrome, or MERS, affected South Korea, one of our popular overseas travel destinations.

        Any future outbreak of contagious diseases, extreme unexpected bad weather or natural disasters would adversely affect our business and operating results. Ongoing concerns regarding contagious disease or natural disasters, particularly its effect on travel, could negatively impact our customers' desire to travel. If there is a recurrence of an outbreak of certain contagious diseases or natural disasters, travel to and from affected regions could be curtailed. Government advice regarding, or restrictions on, travel to and from these and other regions on account of an outbreak of any contagious disease or occurrence of natural disasters may have a material adverse effect on our business and operating results.

If tax benefits available to our subsidiaries in China are reduced or repealed, our results of operations could suffer.

        Under the PRC Enterprise Income Tax Law and the relevant implementation rules, or the EIT Law, effective on January 1, 2008, foreign invested enterprises, or FIEs, and domestic enterprises are subject to EIT at a uniform rate of 25%. Certain enterprises will benefit from a preferential tax rate of 15% under the EIT Law if they qualify as "high and new technology enterprises," subject to certain general restrictions described in the EIT Law and the related regulations.

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        In December 2008, our PRC subsidiaries, Ctrip Computer Technology, Ctrip Travel Information, Ctrip Travel Network, and Beijing Joint Wisdom Information Technology Co., Ltd. were each designated by relevant local authorities as a "high and new technology enterprise" under the EIT Law with an effective period of three years. Therefore, these entities were entitled to enjoy a preferential tax rate of 15%, as long as they maintained their qualifications for "high and new technology enterprises" that are subject to verification by competent tax authorities and renewals every three years with the current effective period expiring by the end of 2017. We cannot assure you that our subsidiaries will continue to qualify as high and new technology enterprises when they are subject to reevaluation in the future. In 2002, the PRC State Administration of Taxation, or the SAT, started to implement preferential tax policy in China's western region, and companies located in applicable jurisdictions covered by the Catalogue of Encouraged Industries in the Western Region (initially effective through the end of 2010 and further extended to 2020) are eligible to apply for a preferential income tax rate of 15% if their businesses fall within the "encouraged" category of the policy and the revenue derived from such "encouraged" businesses accounts for more than 70% of the total revenue. Benefiting from this policy, Chengdu Ctrip and Chengdu Ctrip International obtained approval from local tax authorities to apply the 15% tax rate for their annual tax filing subject to periodic renewals over the years since 2012. The two entities re-applied for this qualification after the effective period expired in 2014 and their applications were approved by the relevant government authority. In 2013, Chengdu Information Technology Co., Ltd., or Chengdu Information, obtained approval from local tax authorities to apply the 15% tax rate for its 2012 tax filing and for the years from 2013 to 2016. In the event that the preferential tax treatment for these entities is discontinued, these entities will become subject to the standard tax rate at 25%, which would materially increase our tax obligations.

We have sustained losses in the past and may experience earnings declines or net losses in the future.

        We sustained net losses in certain past periods, and we cannot assure you that we can sustain profitability or avoid net losses in the future. We expect that our operating expenses will increase and the degree of increase in these expenses is largely based on anticipated growth, revenue trends and competitive pressure. As a result, any decrease or delay in generating additional sales volume and revenues and increase in our operating expenses may result in substantial operating losses. Moreover, consolidation of Qunar's financial statements starting from December 31, 2015 has negatively impacted our financial statements and may continue to negatively impact our financial performance in the upcoming financial reporting cycles for an extended period of time. See "—Consolidation of the results of operations of Qunar with ours may negatively impact our financial performance and results of operations."

We have incurred substantial indebtedness and may incur additional indebtedness in the future. We may not be able to generate sufficient cash to satisfy our outstanding and future debt obligations.

        As of June 30, 2016, our total short-term borrowings and long-term borrowings (current portions) were RMB5.8 billion (US$870 million), our total long-term borrowings (excluding current portions) were RMB900 million (US$135 million), and the aggregate principal amount of our outstanding convertible notes was RMB24.5 billion (US$3.7 billion). In addition, we are offering US$750 million principal amount of our convertible senior notes due 2022. To the extent that we were to settle or redeem our convertible notes in cash, our debt obligations would become more substantial.

        Our substantial indebtedness could have important consequences to you. For example, it could:

•

increase our vulnerability to adverse general economic and industry conditions;



•

require us to dedicate a substantial portion of our cash flow from operations to servicing and repaying our indebtedness, thereby reducing the availability of our cash flow to fund working capital, capital expenditures and other general corporate purposes; and

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•

limit, along with the financial and other restrictive covenants of our indebtedness, among other things, our ability to conduct additional financing activities, or increase the cost of additional financing.

        In the future, we may from time to time incur additional indebtedness and contingent liabilities. If we incur additional debt, the risks that we face as a result of our substantial indebtedness and leverage could intensify.

        Our ability to generate sufficient cash to satisfy our outstanding and future debt obligations will depend upon our future operating performance, which will be affected by prevailing economic conditions and financial, business and other factors, many of which are beyond our control. As a result, we may not generate or obtain sufficient cash flow to meet our anticipated operating expenses and to service our debt obligation as they become due.

We may be subject to legal or administrative proceedings regarding information provided on our online portals or other aspects of our business operations, which may be time-consuming to defend.

        Our online portals contain information about hotels, transportation, popular vacation destinations and other travel-related topics. It is possible that if any information accessible on our online portals contains errors or false or misleading information, third parties could take action against us for losses incurred in connection with the use of such information. From time to time, we have become and may in the future become a party to various legal or administrative proceedings arising in the ordinary course of our business, including actions with respect to labor and employment claims, breach of contract claims, anti-competition claims and other matters. Although such proceedings are inherently uncertain and their results cannot be predicted with certainty, we believe that the resolution of our current pending matters will not have a material adverse effect on our business, consolidated financial position, results of operations or cash flow. Regardless of the outcome and merit of such proceedings, however, any legal action can have an adverse impact on us because of defense costs, negative publicity, diversion of management's attention and other factors. In addition, it is possible that an unfavorable resolution of one or more legal or administrative proceedings, whether in the PRC or in another jurisdiction, could materially and adversely affect our financial position, results of operations or cash flows in a particular period or damage our reputation.

We could be liable for breaches of Internet security or fraudulent transactions by users of our mobile platform and our websites.

        The Internet industry is facing significant challenges regarding information security and privacy, including the storage, transmission and sharing of confidential information. In recent years, PRC government authorities have enacted legislation on Internet use to protect personal information from any unauthorized disclosure. We conduct a significant portion of our transactions through the Internet, including our mobile platform and websites. In such transactions, secured transmission of confidential information (such as customers' itineraries, hotel and other reservation information, credit card information, personal information and billing addresses) over public networks and ensuring the confidentiality, integrity, availability and authenticity of the information of our users, customers, hotel suppliers and airline partners are essential to maintaining their confidence in our online products and services. Our current security measures may not be adequate and may contain deficiencies that we fail to identify, and advances in technology, increased levels of expertise of hackers, new discoveries in the field of cryptography or others could increase our vulnerability. For example, a third-party website with focus on Internet security information exchange released news in March 2014 that as a result of a temporary testing function performed by us, certain data files containing customers' credit card information had been stored on local servers maintained by us, which may lead to potential exposure of these customers' information to hackers. We removed the cause of the potential security concern within two hours of the release of the news report and then examined all other possible leaks and found that

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93 customers' credit card information might have been downloaded by the above-mentioned website for the purpose of confirming potential risks. Although to our knowledge, no customer has suffered financial loss or other damage due to the incident as of the date of this report, our business, results of operations, user experience and reputation may be materially and adversely affected if similar incidents related to Internet security recur in the future. In August 2011, China's Supreme People's Court and Supreme People's Procuratorate issued judicial interpretations regarding hacking and other Internet crimes. However, its effect on curbing hacking and other illegal online activities still remains to be seen.

        Significant capital, managerial and human resources are required to enhance information security and to address any issues caused by security failures. If we are unable to protect our systems and the information stored in our systems from unauthorized access, use, disclosure, disruption, modification or destruction, such problems or security breaches may cause loss, expose us to litigation and possible liability to the owners of confidential information, disrupt our operations and may harm our reputation and ability to attract customers.

We may be the subject of detrimental conduct by third parties including complaints to regulatory agencies, negative blog postings, and the public dissemination of malicious assessments of our business, which could have a negative impact on our reputation and cause us to lose market share, travel suppliers and customers and revenues, and adversely affect the price of our ADSs.

        We may be the target of anti-competitive, harassing, or other detrimental conduct by third parties. Such conduct may include complaints, anonymous or otherwise, to regulatory agencies regarding our operations, accounting, revenues, business relationships, business prospects and business ethics. Additionally, allegations, directly or indirectly against us, may be posted in Internet chat-rooms or on blogs or any websites by anyone, whether or not related to us, on an anonymous basis. We may be subject to government or regulatory investigation as a result of such third-party conduct and may be required to expend significant time and incur substantial costs to address such third-party conduct, and there is no assurance that we will be able to conclusively refute each of the allegations within a reasonable period of time, or at all. Our reputation may also be negatively affected as a result of the public dissemination of anonymous allegations or malicious statements about our business, which in turn may cause us to lose market share, travel suppliers and customers and revenues and adversely affect the price of our ADSs.

We have limited business insurance coverage in Greater China.

        Insurance companies in Greater China offer limited business insurance products and generally do not, to our knowledge, offer business liability insurance. Business disruption insurance is available to a limited extent in Greater China, but we have determined that the risks of disruption, the cost of such insurance and the difficulties associated with acquiring such insurance make it impractical for us to have such insurance. We do not maintain insurance coverage for any kinds of business liabilities or disruptions and would have to bear the costs and expenses associated with any such events out of our own resources.

We hire celebrities to be our brand ambassadors to market our brands and products and this marketing initiative may not be effective.

        From time to time, we hire celebrities to be our brand ambassadors to market our "Ctrip" brand or our products and services that are important to our business. However, we cannot give assurance that the endorsement from our brand ambassadors or related advertisements will remain effective, that the brand ambassador will remain popular or his or her images will remain positive and compatible with the messages that our brand and products aim to convey. Furthermore, we cannot ensure that we can successfully find suitable celebrities to replace any of our existing brand ambassador if any of his

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popularities declines or if the existing brand ambassador is no longer able or suitable to continue the engagement, and termination of such engagements may have a significant impact on our brand images and the promotion or sales of our products. If any of these situations occurs, our business, financial condition and results of operations could be materially and adversely affected.

We may face greater risks of doubtful accounts as our corporate travel business increases in scale.

        Since we began providing travel booking services to corporate customers who generally request credit terms, our accounts receivable have increased. We cannot assure you that we will be able to collect payment fully and in a timely manner on our outstanding accounts receivable from our corporate travel service customers. As a result, we may face a greater risk of non-payment of our accounts receivable and, as our corporate travel business grows in scale, we may need to make increased provisions for doubtful accounts. Our operating results and financial condition may be materially and adversely affected if we are unable to successfully manage our accounts receivable.

Our accounting treatment for share-based compensation could continue to significantly reduce our net income.

        Since 2006, we have accounted for share-based compensation in accordance with ASC 718 "Compensation—Stock Compensation," or ASC 718, which requires a public company to recognize, as an expense, the fair value of share options and other share-based compensation to employees based on the requisite service period of the share-based awards. We have granted share-based compensation awards, including share options and restricted share units, to employees, officers and directors to incentivize performance and align their interests with ours. We have adopted four share incentive plans, namely, the 2007 Share Incentive Plan, or the 2007 Plan, the 2005 Employee's Stock Option Plan, or the 2005 Plan, the 2003 Employee's Option Plan, or the 2003 Plan, and the 2000 Employee's Stock Option Plan, or the 2000 Plan. As a result of these grants and potential future grants under these plans, we had incurred in the past and expect to continue to incur in future periods significant share-based compensation expenses. The amount of these expenses is based on the fair value of the share-based awards.

        Our board of directors has the discretion to change terms of any previously issued share options and any such change may significantly increase the amount of our share-based compensation expenses for the period that the change takes effect as well as those for any future periods. In February 2009, our board of directors approved to reduce the exercise price of all outstanding unvested options that were granted by us in 2007 and 2008 under our 2007 Plan to the then fair market value of our ordinary shares underlying such options and, in December 2009, our board of directors approved to extend the expiration dates of all stock options granted in 2005 and 2006 to eight years after the respective original grant dates of these options. As a result of such changes, our share-based compensation expense of 2009 reduced our diluted earnings per ADS by US$0.14. In February 2010, our compensation committee approved to extend the expiration dates of all stock options granted in and after 2007 to eight years after the respective original grant dates of these options. As a result of such changes and extensions, our share-based compensation expense of 2010 reduced our diluted earnings per ADS by US$0.06. In addition, with such changes and extensions, the application of ASC 718 will continue to have a significant impact on our net income. In addition, future changes to various assumptions used to determine the fair value of awards issued or the amount and type of equity awards granted may also create uncertainty as to the amount of future share-based compensation expense.

Failure to maintain effective internal control over financial reporting could result in errors in our published financial statements, which in turn could have a material adverse effect on the trading price of our ADSs.

        We are subject to the reporting obligations under the U.S. securities laws. The U.S. Securities and Exchange Commission, or the SEC, as required under Section 404 of the Sarbanes-Oxley Act of 2002, has adopted rules requiring public companies to include a report of management on the effectiveness

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of such companies' internal control over financial reporting in its annual report. In addition, an independent registered public accounting firm for a public company must issue an attestation report on the effectiveness of the company's internal control over financial reporting. Our management conducted an evaluation of the effectiveness of our internal control over financial reporting and concluded that our internal control over financial reporting was effective as of December 31, 2015. In addition, our independent registered public accounting firm attested the effectiveness of our internal control and reported that our internal control over financial reporting was effective as of December 31, 2015. If we fail to maintain the effectiveness of our internal control over financial reporting, we may not be able to conclude on an ongoing basis that we have effective internal control over financial reporting in accordance with the Sarbanes-Oxley Act. Moreover, effective internal control over financial reporting is necessary for us to produce reliable financial reports. As a result, any failure to maintain effective internal control over financial reporting could result in the loss of investor confidence in the reliability of our financial statements, which in turn could negatively impact the trading price of our ADSs. Furthermore, we may need to incur additional costs and use additional management and other resources in an effort to comply with Section 404 of the Sarbanes-Oxley Act and other requirements going forward.

We may need additional capital and we may not be able to obtain it.

        We believe that our current cash and cash equivalents, short-term investments, cash flow from operations and proceeds from our financing activities will be sufficient to meet our anticipated cash needs for the foreseeable future. We may, however, require additional cash resources due to changed business conditions or other future developments, including any investments or acquisitions we may decide to pursue. If these resources are insufficient to satisfy our cash requirements, we may seek to sell additional equity or debt securities or obtain a credit facility. The sale of additional equity securities could result in additional dilution to our shareholders. The incurrence of indebtedness would result in increased debt service obligations and could result in operating and financing covenants that would restrict our operations. We cannot assure you that financing will be available in amounts or on terms acceptable to us, if at all. In particular, the recent financial turmoil affecting the financial markets and banking system may significantly restrict our ability to obtain financing in the capital markets or from financial institutions on commercially reasonable terms, or at all.

Risks Related to Our Corporate Structure

PRC laws and regulations restrict foreign investment in the air-ticketing, travel agency and value-added telecommunications businesses, and substantial uncertainties exist with respect to the application and implementation of PRC laws and regulations.

        We are a Cayman Islands incorporated company and a foreign person under PRC law. Due to foreign ownership restrictions in the air-ticketing, travel agency and value-added telecommunications industries, we conduct part of our business through contractual arrangements with our consolidated affiliated Chinese entities. These entities hold the licenses and approvals that are essential for our business operations.

        In the opinion of our PRC counsel, Commerce & Finance Law Offices, our current ownership structure, the ownership structure of our subsidiaries and our consolidated affiliated Chinese entities, the contractual arrangements among us, our subsidiaries, our consolidated affiliated Chinese entities and their shareholders, as described in this prospectus supplement, are in compliance with existing PRC laws, rules and regulations. There are, however, substantial uncertainties regarding the interpretation and application of current or future PRC laws and regulations. Accordingly, we cannot assure you that PRC government authorities will not ultimately take a view contrary to the opinion of our PRC legal counsel due to the lack of official interpretation and clear guidance.

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        If we and our consolidated affiliated Chinese entities are found to be in violation of any existing or future PRC laws or regulations, the relevant governmental authorities would have broad discretion in dealing with such violation, including, without limitation, levying fines, confiscating our income or the income of our consolidated affiliated Chinese entities, revoking our business licenses or the business licenses of our consolidated affiliated Chinese entities, requiring us and our consolidated affiliated Chinese entities to restructure our ownership structure or operations and requiring us or our consolidated affiliated Chinese entities to discontinue any portion or all of our value-added telecommunications, air-ticketing or travel agency businesses. In particular, if the PRC government authorities impose penalties which cause us to lose our rights to direct the activities of and receive economic benefits from our consolidated affiliated Chinese entities, we may lose the ability to consolidate and reflect in our financial statements the operation results of our consolidated affiliated Chinese entities. Any of these actions could cause significant disruption to our business operations, and may materially and adversely affect our business, financial condition and results of operations.

        Under the equity pledge agreements between our subsidiaries and the shareholders of our consolidated affiliated Chinese entities, the shareholders of our consolidated affiliated Chinese entities pledged their respective equity interests in these entities to our subsidiaries. According to the PRC Property Rights Law, effective as of October 1, 2007, and the Measures for the Registration of Equity Pledge with the Administration for Industry and Commerce, effective as of October 1, 2008, the effectiveness of the pledges will be denied if the pledges are not registered with the Administration for Industry and Commerce. Except that the pledge registration of Qunar Beijing is in process, our consolidated affiliated Chinese entities and our subsidiaries have registered all equity pledges. The effectiveness of the pledges upon registration will be recognized by PRC courts if disputes arise on certain pledged equity interests and that our subsidiaries' interests as pledgees will prevail over those of third parties.

        Furthermore, we were aware that a China-based company listed in the U.S. announced in 2012 that it was subject to the SEC's investigation which it believed related to the consolidation of its consolidated affiliated Chinese entities. Following the announcement, that issuer's stock price declined significantly. Although we are not aware of any actual or threatened investigation, inquiry or other action by the SEC, NASDAQ or any other regulatory authority with respect to consolidation of our consolidated affiliated Chinese entities, we cannot assure you that we will not be subject to any such investigation or inquiry in the future. In the event we are subject to any regulatory investigation or inquiry relating to our consolidated affiliated Chinese entities, including the consolidation of such entities into our financial statements, or any other matters, we may need to spend significant amount of time and expenses in connection with the investigation or inquiry, our reputation may be harmed regardless of the outcome, and the trading price of our ADS may materially decline or fluctuate.

If our consolidated affiliated Chinese entities violate our contractual arrangements with them, our business could be disrupted, our reputation may be harmed and we may have to resort to litigation to enforce our rights, which may be time-consuming and expensive.

        As the PRC government restricts foreign ownership of value-added telecommunications, air-ticketing and travel agency businesses in China, we depend on our consolidated affiliated Chinese entities, in which we have no ownership interest, to conduct part of our non-accommodation reservation business activities through a series of contractual arrangements, which are intended to provide us with effective control over these entities and allow us to obtain economic benefits from them. Although we have been advised by our PRC counsel, Commerce & Finance Law Offices, that, except that certain pledges were not registered as disclosed herein, the contractual arrangements as described in this prospectus supplement are valid, binding and enforceable under current PRC laws, these arrangements are not as effective in providing control as direct ownership of these businesses. For example, our consolidated affiliated Chinese entities could violate our contractual arrangements

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with them by, among other things, failing to operate our air-ticketing or packaged-tour business in an acceptable manner or pay us for our consulting or other services. In any such event, we would have to rely on the PRC legal system for the enforcement of those agreements, which could have uncertain results. Any legal proceeding could result in the disruption of our business, damage to our reputation, diversion of our resources and incurrence of substantial costs. See "—Risks Related to Doing Business in China—Uncertainties with respect to the PRC legal system could adversely affect us."

The principal shareholders of our consolidated affiliated Chinese entities have potential conflicts of interest with us, which may adversely affect our business.

        Our director, vice chairman of the board and president, Min Fan, our officers, Tao Yang and Maohua Sun were also the principal shareholders of our consolidated affiliated Chinese entities as of the date of this prospectus supplement. Thus, conflicts of interest between their duties to our company and our consolidated affiliated Chinese entities may arise. We cannot assure you that when conflicts of interest arise, these persons will act entirely in our interests or that the conflicts of interest will be resolved in our favor. In addition, these persons could violate their non-competition or employment agreements with us or their legal duties by diverting business opportunities from us to others, resulting in our loss of corporate opportunities. In any such event, we would have to rely on the PRC legal system for the enforcement of these agreements, which could have uncertain results. Any legal proceeding could result in the disruption of our business, diversion of our resources and incurrence of substantial costs. See "—Risks Related to Doing Business in China—Uncertainties with respect to the PRC legal system could adversely affect us."

Substantial uncertainties exist with respect to the enactment timetable, interpretation and implementation of draft PRC Foreign Investment Law and how it may impact the viability of our current corporate structure, corporate governance and business operations.

        MOFCOM published a discussion draft of the proposed Foreign Investment Law in January 2015 aiming to, upon its enactment, replace the trio of existing laws regulating foreign investment in China, namely, the Sino-foreign Equity Joint Venture Enterprise Law, the Sino-foreign Cooperative Joint Venture Enterprise Law and the Wholly Foreign-invested Enterprise Law, together with their implementation rules and ancillary regulations. The draft Foreign Investment Law embodies an expected PRC regulatory trend to rationalize its foreign investment regulatory regime in line with prevailing international practice and the legislative efforts to unify the corporate legal requirements for both foreign and domestic investments. MOFCOM solicited comments on this draft and substantial uncertainties exist with respect to its enactment timetable, interpretation and implementation. The draft Foreign Investment Law, if enacted as proposed, may materially impact the entire legal framework regulating the foreign investments in China as well as the viability of our current corporate structure, corporate governance and business operations in many aspects.

        Among other things, the draft Foreign Investment Law expands the definition of foreign investment and introduces the principle of "actual control" in determining whether a company is considered a foreign-invested enterprise, or an FIE. The draft Foreign Investment Law specifically provides that entities established in China but "controlled" by foreign investors will be treated as FIEs, whereas an entity set up in a foreign jurisdiction would nonetheless be, upon market entry clearance by MOFCOM, treated as a PRC domestic investor provided that the entity is "controlled" by PRC entities and/or citizens. In this connection, "control" is broadly defined in the draft law to cover any of the following summarized categories: (i) holding 50% of or more of the equity interest, share of interests, voting rights or similar equity interest of the subject entity; (ii) holding less than 50% of the equity interest, share of interests, voting rights or similar equity interest of the subject entity but having the power to secure at least 50% of the seats on the board or other equivalent decision making bodies, or having the voting power to material influence on the board, the shareholders' meeting or other

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equivalent decision making bodies; or (iii) having the power to exert decisive influence, via contractual or trust arrangements, over the subject entity's operations, financial matters or other key aspects of business operations. Once an entity is determined to be an FIE and its investment amount exceeds certain thresholds or its business operation falls within a "negative list" to be separately issued by the State Council in the future, market entry clearance by MOFCOM or its local counterparts would be required. Otherwise, all foreign investors may make investments on the same terms as Chinese investors without being subject to additional approval from the government authorities as mandated by the existing foreign investment legal regime.

        The "variable interest entity" structure, or VIE structure, has been adopted by many PRC-based companies, including us, to obtain necessary licenses and permits in the industries that are currently subject to foreign investment restrictions in China. See "—Risks Related to Our Company Structure—PRC laws and regulations restrict foreign investment in the air-ticketing, travel agency and value-added telecommunications businesses, and substantial uncertainties exist with respect to the application and implementation of PRC laws and regulations" and "Item 7. Major Shareholders and Related Party Transactions—Related Party Transactions—Arrangements with Consolidated Affiliated Chinese Entities" in our 2015 Annual Report, which is incorporated by reference in this prospectus supplement and the accompanying prospectus. Under the draft Foreign Investment Law, variable interest entities that are controlled via contractual arrangements would also be deemed as FIEs, if they are ultimately "controlled" by foreign investors. Therefore, for any companies with a VIE structure in an industry category that is on the "negative list," the existing VIE structure may be deemed legitimate only if the ultimate controlling person(s) is/are of PRC nationality (either PRC state owned enterprises or agencies, or PRC citizens). Conversely, if the actual controlling person(s) is/are of foreign nationalities, then the variable interest entities will be treated as FIEs and any operation in the industry category on the "negative list" without market entry clearance may be considered as illegal.

        It is likely that we would not be considered as ultimately controlled by PRC nationals, as our shareholder base is relatively diverse and, to our knowledge, ultimate beneficial owners of our shares who are PRC nationals may not, in the aggregate, control more than 50% of our total voting power as of March 31, 2016. The draft Foreign Investment Law has not taken a position on what actions will be taken with respect to the existing companies with a VIE structure, whether or not these companies are controlled by Chinese parties, while it solicited comments from the public on this point by illustrating several possible options. Under these varied options, a company that has a VIE structure and conducts the business on the "negative list" at the time of enactment of the new Foreign Investment Law has either the option or obligation to disclose its corporate structure to the authorities, while the authorities, after reviewing the ultimate share control structure of the company, may either permit the company to continue maintain the VIE structure (if the company is deemed ultimately controlled by PRC nationals), or require the company to dispose of its businesses and/or VIE structure based on circumstantial considerations. Moreover, it is uncertain whether the air-ticketing, travel agency and value-added telecommunications industries, in which our variable interest entities operate, will be subject to the foreign investment restrictions or prohibitions set forth in the "negative list" to be issued. If the enacted version of the Foreign Investment Law and the final "negative list" mandate further actions, such as MOFCOM market entry clearance or certain restructuring of our corporate structure and operations, to be completed by companies with existing VIE structure like us, we face substantial uncertainties as to whether these actions can be timely completed, or at all, and our business and financial condition may be materially and adversely affected.

        The draft Foreign Investment Law, if enacted as proposed, may also materially impact our corporate governance practice and increase our compliance costs. For instance, the draft Foreign Investment Law imposes stringent ad hoc and periodic information reporting requirements on foreign investors and the applicable FIEs. Aside from investment implementation report and investment amendment report that are required at each investment and alteration of investment specifics, an

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annual report is mandatory, and large foreign investors meeting certain criteria are required to report on a quarterly basis. Any company found to be non-compliant with these information reporting obligations may potentially be subject to fines and/or administrative or criminal liabilities, and the persons directly responsible may be subject to criminal liabilities.

        On September 3, 2016, the Standing Committee of the National People's Congress passed a decision in connection with the revision of the Wholly Foreign-invested Enterprise Law and other three laws, which would be implemented starting on October 1, 2016. According to this decision, formation of an FIE in a sector not subject to special entry administrative measures will be simplified by going through government filing instead of government approval process. The special entry administrative measures will be separately promulgated by the State Council. Subsequently, the MOFCOM published a discussion draft of the proposed Provisional Measures on Filing Administration for Establishment and Change of Foreign-invested Enterprises, which, upon its enactment, aims to implement and elaborate the fling requirement, procedures, supervision and related matters.

Our contractual arrangements with our consolidated affiliated Chinese entities may result in adverse tax consequences to us.

        As a result of our corporate structure and the contractual arrangements between us and our consolidated affiliated Chinese entities, we are effectively subject to the 5% PRC business tax or 6% PRC value-added taxes on both revenues generated by our consolidated affiliated Chinese entities' operations in China and revenues derived from our contractual arrangements with our consolidated affiliated Chinese entities. We may be subject to adverse tax consequences if the PRC tax authorities were to determine that the contracts between us and our consolidated affiliated Chinese entities were not made on an arm's-length basis and therefore constitute favorable transfer pricing arrangements. If this occurs, the PRC tax authorities could request that our consolidated affiliated Chinese entities adjust their taxable income upward for PRC tax purposes. Such a pricing adjustment could adversely affect us by increasing our consolidated affiliated Chinese entities' tax expenses without reducing our tax expenses, which could subject our consolidated affiliated Chinese entities to late payment fees and other penalties for underpayment of taxes, and/or result in the loss of the tax benefits available to our subsidiaries in China. The EIT Law requires every enterprise in China to submit its annual enterprise income tax return together with a report on transactions with its affiliates to the relevant tax authorities. The tax authorities may impose reasonable adjustments on taxation if they have identified any related party transactions that are inconsistent with arm's-length principles. As a result, our contractual arrangements with our consolidated affiliated Chinese entities may result in adverse tax consequences to us.

Our subsidiaries and consolidated affiliated Chinese entities in China are subject to restrictions on paying dividends or making other payments to us, which may restrict our ability to satisfy our liquidity requirements.

        We are a holding company incorporated in the Cayman Islands. We rely on dividends from our subsidiaries in China and consulting and other fees paid to us by our consolidated affiliated Chinese entities. Current PRC regulations permit our subsidiaries to pay dividends to us only out of their accumulated profits, if any, determined in accordance with Chinese accounting standards and regulations. In addition, our subsidiaries in China are required to set aside at least 10% of their respective accumulated profits each year, if any, to fund certain reserve funds unless these reserves have reached 50% of the subsidiaries' registered capital. These reserves are not distributable as cash dividends. Furthermore, if our subsidiaries and consolidated affiliated Chinese entities in China incur debt on their own behalf in the future, the instruments governing the debt may restrict their ability to pay dividends or make other payments to us, which may restrict our ability to satisfy our liquidity requirements.

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        Pursuant to the EIT Law and a circular issued by the PRC Ministry of Finance and the SAT, in February 2008, the dividends declared out of the profits earned after January 1, 2008 by an FIE to its immediate holding company outside China are subject to a 10% withholding tax unless such foreign investor's jurisdiction of incorporation has a tax treaty with China that provides for a different withholding arrangement, and certain supplementary requirements and procedures stipulated by SAT for such tax treaty are met and observed. Our subsidiaries in China are considered FIEs and are directly held by our subsidiaries in Hong Kong. According to the currently effective tax treaty between China and Hong Kong, dividends payable by an FIE in China to a company in Hong Kong which directly holds at least 25% of the equity interests in the FIE will be subject to a withholding tax of 5%. In February 2009, the SAT issued a new notice, Notice No. 81. According to Notice No. 81, in order to enjoy the preferential treatment on dividend withholding tax rates, an enterprise must be the "beneficial owner" of the relevant dividend income, and no enterprise is entitled to enjoy preferential treatment pursuant to any tax treaties if such enterprise qualifies for such preferential tax rates through any transaction or arrangement, the major purpose of which is to obtain such preferential tax treatment. The tax authority in charge has the right to make adjustments to the applicable tax rates, if it determines that any taxpayer has enjoyed preferential treatment under tax treaties as a result of such transaction or arrangement. In October 2009, the SAT issued another notice on this matter, Notice No. 601, to provide guidance on the criteria for determining whether an enterprise qualifies as the "beneficial owner" of the PRC sourced income for the purpose of obtaining preferential treatment under tax treaties. Pursuant to Notice No. 601, the PRC tax authorities will review and grant tax preferential treatment on a case-by-case basis and adopt the "substance over form" principle in the review. Notice No. 601 specifies that a beneficial owner should generally carry out substantial business activities and own and have control over the income, the assets or other rights generating the income. Therefore, an agent or a conduit company will not be regarded as a beneficial owner of such income. Since the two notices were issued, it has remained unclear how the PRC tax authorities will implement them in practice and to what extent they will affect the dividend withholding tax rates for dividends distributed by our subsidiaries in China to our Hong Kong subsidiaries. If the relevant tax authority determines that our Hong Kong subsidiary is a conduit company and does not qualify as the "beneficial owner" of the dividend income it receives from our PRC subsidiaries, the higher 10% withholding tax rate will apply to such dividends.

        Under the EIT Law, an enterprise established outside of China with its "de facto management body" within China is considered a resident enterprise and will be subject to enterprise income tax at the rate of 25% on its worldwide income. The "de facto management body" is defined as the organizational body that effectively exercises overall management and control over production and business operations, personnel, finance and accounting, and properties of the enterprise. It remains unclear how the PRC tax authorities will interpret such a broad definition. If the PRC tax authorities determine that we should be classified as a resident enterprise for PRC tax purposes, our global income will be subject to income tax at a uniform rate of 25%, which may have a material adverse effect on our financial condition and results of operations. Notwithstanding the foregoing provision, the EIT Law also provides that, if a resident enterprise directly invests in another resident enterprise, the dividends received by the investing resident enterprise from the invested enterprise are exempted from income tax, subject to certain conditions. However, it remains unclear how the PRC tax authorities will interpret the PRC tax resident treatment of an offshore company, like us, having indirect ownership interests in PRC enterprises through intermediary holding vehicles.

        Moreover, under the EIT Law, foreign ADS holders that are not PRC resident enterprises may be subject to a 10% withholding tax upon dividends payable by a Chinese entity that is considered as a PRC resident enterprise and gains realized on the sale or other disposition of ADSs or ordinary shares, if such income is considered as income derived from within China. Any such tax would reduce the returns on your investment in our ADSs.

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If we exercise the option to acquire equity ownership in our consolidated affiliated Chinese entities, such ownership transfer require approval from or filings with PRC governmental authorities and subject to taxation, which may result in substantial costs to us.

        Pursuant to the relevant contractual arrangements, three of our PRC subsidiaries, Ctrip Travel Information, Ctrip Travel Network, and Wancheng (Shanghai) Travel Agency Co., Ltd., or Wancheng (or their respective designees), each has its respective exclusive right to purchase all or any part of the equity interests in the applicable consolidated affiliated Chinese entities of ours from the respective shareholders of these consolidated affiliated Chinese entities for a price that is the higher of (i) the registered capital of such consolidated affiliated Chinese entities or (ii) another minimum price as permitted by the then applicable PRC laws. Such equity transfers may be subject to approvals from, or filings with, relevant PRC governmental authorities. In addition, the relevant equity transfer price may be subject to review and tax adjustment by the relevant tax authorities. Moreover, the shareholders of our consolidated affiliated Chinese entities, under the circumstances of such equity transfers, will be subject to PRC individual income tax on the difference between the equity transfer price and the then current registered capital of the relevant consolidated affiliated Chinese entities. The shareholders of such consolidated affiliated Chinese entities will pay, after deducting such taxes, the remaining amount to Ctrip Travel Information, Ctrip Travel Network or Wancheng, as appropriate under the applicable contractual arrangements. The amount to be received by Ctrip Travel Information, Ctrip Travel Network, and Wancheng may also be subject to enterprise income tax. Any of the aforementioned tax amounts could be substantial.

We face uncertainty with respect to indirect transfer of equity interests in PRC resident enterprises by their non-PRC resident holding companies.

        We face uncertainties regarding the reporting on and consequences of previous private equity financing transactions involving the transfer and exchange of shares in our company by non-resident investors. According to the Notice on Strengthening Administration of Enterprise Income Tax for Share Transfers by Non-PRC Resident Enterprises issued by the PRC State Administration of Taxation on December 10, 2009, or SAT Circular 698, where a non-resident enterprise transfers the equity interests in a PRC resident enterprise indirectly through a disposition of equity interests in an overseas holding company (other than a purchase and sale of shares issued by a PRC resident enterprise in public securities market), or an Indirect Transfer, the non-resident enterprise, as the seller, may be subject to PRC enterprise income tax of up to 10% of the gains derived from the Indirect Transfer in certain circumstances.

        On February 3, 2015, the SAT issued Announcement on Several Issues Concerning the Enterprise Income Tax on Indirect Property Transfers by Non-RPC Resident Enterprises, or SAT Notice No. 7, to supersede the existing tax rules in relation to the tax treatment of the Indirect Transfer, while the other provisions of SAT Circular 698 irrelevant to the Indirect Transfer remain in force. SAT Notice No. 7 introduces a new tax regime that is significantly different from that under SAT Circular 698. It extends the SAT's tax jurisdiction to capture not only the Indirect Transfer as set forth under SAT Circular 698 but also transactions involving indirect transfer of (i) real properties in China and (ii) assets of an "establishment or place" situated in China, by a non-PRC resident enterprise through a disposition of equity interests in an overseas holding company. SAT Notice No. 7 also extends the interpretation with respect to the disposition of equity interests in an overseas holding company. In addition, SAT Notice No. 7 further clarifies how to assess reasonable commercial purposes and introduces safe harbors applicable to internal group restructurings. However, it also brings challenges to both the foreign transferor and transferee as they are required to make self-assessment on whether an Indirect Transfer or similar transaction should be subject to PRC tax and whether they should file or withhold any tax payment accordingly.

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        There is uncertainty as to the application of SAT Circular 698 and SAT Notice No. 7. In the event that non-PRC resident investors were involved in our private equity financing transactions and such transactions were determined by the competent tax authorities as lack of reasonable commercial purposes, we and our non-PRC resident investors may become at risk of being taxed under SAT Circular 698 and SAT Notice No. 7 and may be required to expend costly resources to comply with SAT Circular 698 and SAT Notice No. 7, or to establish a case to be tax exempt under SAT Circular 698 and SAT Notice No. 7, which may cause us to incur additional costs and may have a negative impact on the value of your investment in us.

        The PRC tax authorities have discretion under SAT Circular 698 and SAT Notice No. 7 to make adjustments to the taxable capital gains based on the difference between the fair value of the transferred equity interests and the investment cost. We may pursue acquisitions in the future that may involve complex corporate structures. If we are considered as a non-PRC resident enterprise under the EIT Law and if the PRC tax authorities make adjustments to the taxable income of the transactions under SAT Circular 698 and SAT Notice No. 7, our income tax expenses associated with such potential acquisitions will be increased, which may have an adverse effect on our financial condition and results of operations.

Risks Related to Doing Business in China

Adverse changes in economic and political policies of the PRC government could have a material adverse effect on the overall economic growth of China, which could adversely affect our business.

        The majority of our business operations are conducted in mainland China. Accordingly, our results of operations, financial condition and prospects are subject to a significant degree to economic, political and legal developments in China. China's economy differs from the economies of most developed countries in many respects, including with respect to the amount of government involvement, level of development, growth rate, control of foreign exchange and allocation of resources. While the PRC economy has experienced significant growth in the past decades, that growth may not continue, as evidenced by the slowing of the growth of the Chinese economy since 2012. Any adverse changes in economic conditions in China, in the policies of the Chinese government or in the laws and regulations in China could have a material adverse effect on the overall economic growth of China. Such developments could adversely affect our business and operating results, lead to reduction in demand for our services and adversely affect our competitive position. The PRC government has implemented various measures to encourage economic development and guide the allocation of resources. Some of these measures benefit the overall PRC economy, but may also have a negative effect on us. For example, our financial condition and results of operations may be adversely affected by government control over capital investments or changes in tax regulations that are applicable to us. In addition, future measures to control the pace of economic growth may cause a decrease in the level of economic activity in China, which in turn could adversely affect our results of operations and financial condition.

Inflation in China may disrupt our business and have an adverse effect on our financial condition and results of operations.

        The Chinese economy has experienced rapid expansion together with rising rates of inflation. Inflation may erode disposable incomes and consumer spending, which may have an adverse effect on the Chinese economy and lead to a reduction in business and leisure travel as the travel industry is highly sensitive to business and personal discretionary spending levels. This in turn could adversely impact our business, financial condition and results of operations.

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Future movements in exchange rates between the U.S. dollar and the RMB may adversely affect the value of our ADSs.

        The value of the Renminbi against the U.S. dollar and other currencies may fluctuate and is affected by, among other things, changes in political and economic conditions. The conversion of the Renminbi into foreign currencies, including the U.S. dollar, has been based on rates set by the People's Bank of China. The PRC government allowed the Renminbi to appreciate by more than 20% against the U.S. dollar between July 2005 and July 2008. Between July 2008 and June 2010, this appreciation halted and the exchange rate between the Renminbi and the U.S. dollar remained within a narrow band. As a consequence, the Renminbi fluctuated significantly during that period against other freely traded currencies, in tandem with the U.S. dollar. Since June, 2010, the PRC government has allowed the Renminbi to appreciate slowly against the U.S. dollar again. It is difficult to predict how market forces or PRC or U.S. government policy may impact the exchange rate between the Renminbi and the U.S. dollar in the future.

        The majority of our revenues and costs are denominated in Renminbi, while a portion of our financial assets and our dividend payments are denominated in U.S. dollars. We have not used any forward contracts or currency borrowings to hedge our exposure to foreign currency risk. Any significant revaluation of the Renminbi or the U.S. dollar may adversely affect our cash flows, earnings and financial position, and the value of, and any dividends payable on, our ADSs. For example, an appreciation of the Renminbi against the U.S. dollar would make any new RMB-denominated investments or expenditures more costly to us, to the extent that we need to convert U.S. dollars into Renminbi for such purposes. An appreciation of the Renminbi against the U.S. dollar would also result in foreign currency translation losses for financial reporting purposes when we translate our U.S. dollar-denominated financial assets into Renminbi, our reporting currency. Conversely, if we decide to convert Renminbi into U.S. dollars for the purpose of making payments for dividends on our ordinary shares or ADSs or for other business purposes, appreciation of the U.S. dollar against the Renminbi would have a negative effect on the U.S. dollar amount available to us.

Restrictions on currency exchange may limit our ability to receive and use our revenues effectively.

        Because the majority of our revenues are in the form of Renminbi, any restrictions on currency exchange may limit our ability to use revenues generated in Renminbi to fund our business activities outside China or to make dividend payments in U.S. dollars. The principal regulation governing foreign currency exchange in China is the Foreign Currency Administration Rules, as amended, or the Rules. Under the Rules, Renminbi is freely convertible for trade—and service-related foreign exchange transactions, but not for direct investment, loan or investment in securities outside China unless the prior approval of the State Administration of Foreign Exchange, or SAFE, is obtained. Although the PRC government regulations now allow greater convertibility of Renminbi for current account transactions, significant restrictions still remain. For example, foreign exchange transactions under our subsidiaries' capital account, including principal payments in respect of foreign currency-denominated obligations, remain subject to significant foreign exchange controls and the approval of SAFE. These limitations could affect our ability to obtain foreign exchange for capital expenditures. We cannot be certain that the PRC regulatory authorities will not impose more stringent restrictions on the convertibility of Renminbi, especially with respect to foreign exchange transactions.

PRC regulations relating to the establishment of offshore special purpose companies by PRC residents and the grant of employee stock options by overseas-listed companies may subject our PRC resident shareholders to personal liability and limit our ability to inject capital into our PRC subsidiaries, limit our subsidiaries' ability to distribute profits to us, or otherwise adversely affect us.

        SAFE issued a public notice, or SAFE Circular 75, in October 2005 requiring PRC residents to register with the local SAFE branch before establishing or controlling any company outside of China

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for the purpose of capital financing with assets or equity interests in any onshore enterprise located in China, referred to in the notice as a "special purpose company." On July 4, 2014, SAFE issued the SAFE's Notice on Relevant Issues Concerning Foreign Exchange Administration for PRC Residents to Engage in Outbound Investment and Financing and Inbound Investment via Special Purpose Vehicles, or SAFE Circular 37, which has superseded SAFE Circular 75. Under SAFE Circular 75, SAFE Circular 37 and other relevant foreign exchange regulations, PRC residents who make, or have previously made, prior to the implementation of these foreign exchange regulations, direct or indirect investments in offshore companies will be required to register those investments. In addition, any PRC resident who is a direct or indirect shareholder of an offshore company is also required to file or update the registration with the local branch of SAFE, with respect to that offshore company for any material change involving its round-trip investment, capital variation, such as an increase or decrease in capital, transfer or swap of shares, merger, division, long-term equity or debt investment or the creation of any security interest. If any PRC shareholder fails to make the required registration or update the previously filed registration, the PRC subsidiary of that offshore parent company may be prohibited from distributing their profits and the proceeds from any reduction in capital, share transfer or liquidation to their offshore parent company, and the offshore parent company may also be prohibited from injecting additional capital into its PRC subsidiary. Moreover, failure to comply with the various foreign exchange registration requirements described above could result in liability under PRC laws for evasion of applicable foreign exchange restrictions.

        We have notified holders of ordinary shares of our company who we know are PRC residents to register with the local SAFE branch as required under the applicable foreign exchange regulations. The failure or inability of our shareholders resident in China to comply with the registration procedures set forth therein may subject them to fines and legal sanctions and may also limit our ability to contribute additional capital into our PRC subsidiaries, limit our PRC subsidiaries' ability to distribute profits to our company or otherwise adversely affect our business.

        On February 15, 2012, SAFE promulgated the Circular on Relevant Issues Concerning Foreign Exchange Administration for Domestic Individuals Participating in an Employees Share Incentive Plan of an Overseas-Listed Company (which is replacing the old circular, "Application Procedure of Foreign Exchange Administration for Domestic Individuals Participating in an Employee Stock Holding Plan or Stock Option Plan of an Overseas-Listed Company", of 2007), or the new Share Incentive Rule. Under the new Share Incentive Rule, PRC resident individuals who participate in a share incentive plan of an overseas publicly listed company are required to register with SAFE and complete certain other procedures. All such participants need to retain a PRC agent through PRC subsidiary to register with SAFE and handle foreign exchange matters such as opening accounts, transferring and settlement of the relevant proceeds. The new Share Incentive Rule further requires that an offshore agent should also be designated to handle matters in connection with the exercise or sale of share options and proceeds transferring for the share incentive plan participants. We and our PRC employees who have been granted stock options are subject to the Share Incentive Rule. If we or our PRC optionees fail to comply with these regulations, we or our PRC optionees may be subject to fines and legal sanctions.

Uncertainties with respect to the PRC legal system could adversely affect us.

        We conduct our business primarily through our wholly owned subsidiaries incorporated in China. Our subsidiaries are generally subject to laws and regulations applicable to foreign investment in China and, in particular, laws applicable to wholly foreign owned enterprises. In addition, we depend on several consolidated affiliated Chinese entities in China to honor their service agreements with us. Almost all of these agreements are governed by PRC law and disputes arising out of these agreements are expected to be decided by arbitration in China. The PRC legal system is based on written statutes. Prior court decisions may be cited for reference but have limited precedential value. Since 1979, PRC legislation and regulations have significantly enhanced the protections afforded to various forms of

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foreign investments in China. However, since the PRC legal system is still evolving, the interpretations of many laws, regulations and rules are not always uniform and enforcement of these laws, regulations and rules involve uncertainties, which may limit remedies available to us. In addition, any litigation in China may be protracted and result in substantial costs and diversion of resources and management attention. If we and our consolidated affiliated Chinese entities are found to be in violation of any existing or future PRC laws or regulations, or fail to obtain or maintain any of the required permits or approvals, the relevant PRC regulatory authorities would have broad discretion in dealing with such violations, including restructuring. See "—Risks Related to Our Corporate Structure—PRC laws and regulations restrict foreign investment in the air-ticketing, travel agency and value-added telecommunications businesses, and substantial uncertainties exist with respect to the application and implementation of PRC laws and regulations." and "Risks Related to Our Corporate Structure—Substantial uncertainties exist with respect to the enactment timetable, interpretation and implementation of draft PRC Foreign Investment Law and how it may impact the viability of our current corporate structure, corporate governance and business operations."

Implementation of laws and regulations relating to data privacy in China could adversely affect our business.

        Certain data and services collected, provided or used by us or provided to and used by us or our users are currently subject to regulation in certain jurisdictions, including China. The PRC Constitution states that PRC laws protect the freedom and privacy of communications of citizens and prohibit infringement of such basic rights, and the PRC Contract Law prohibits contracting parties from disclosing or misusing the trade secrets of the other party. Further, companies or their employees who illegally trade or disclose customer data may face criminal charges. Although the definition and scope of "privacy" and "trade secret" remain relatively ambiguous under PRC law, growing concerns about individual privacy and the collection, distribution and use of information about individuals have led to national and local regulations that could increase our expenses.

        In December 2012, the Standing Committee of the National People's Congress enacted the Decision to Enhance the Protection of Network Information, or the Information Protection Decision, to further enhance the protection of users' personal information in electronic form. The Information Protection Decision provides that Internet information services providers must expressly inform their users of the purpose, manner and scope of the collection and use of users' personal information by Internet information services providers, publish the Internet information services providers standards for their collection and use of users' personal information, and collect and use users' personal information only with the consent of the users and only within the scope of such consent. The Information Protection Decision also mandates that Internet information services providers and their employees keep users' personal information that they collect strictly confidential, and that they must take such technical and other measures as are necessary to safeguard the information against disclosure, damages and loss. Pursuant to the Order for the Protection of Telecommunication and Internet User Personal Information issued by China's Ministry of Industry and Information Technology (formerly known as the Ministry of Information Industry), or the MIIT in July 2013, any collection and use of user personal information must be subject to the consent of the user, abide by the principles of legality, rationality and necessity and be within the specified purposes, methods and scopes. Compliance with current regulations and regulations that may come into effect in these areas may increase our expenses related to regulatory compliance, which could have an adverse effect on our financial condition and operating results.

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PRC regulation of loans and direct investment by offshore holding companies to PRC entities may delay or prevent us from using the proceeds from the offerings of any securities to make loans or additional capital contributions to our PRC operating subsidiaries.

        In September 2012, we completed an offering of US$180 million in aggregate principal amount of 0.5% convertible senior notes due 2017, or the 2017 notes. In October 2013, we completed another offering of US$800 million in aggregate principal amount of 1.25% convertible senior notes due 2018, or the 2018 notes. In August 2014, in May 2015 and in December 2015, we issued US$500 million in aggregate principal amount of 1.00% convertible notes due 2019, or the Priceline 2019 notes, US$250 million in aggregate principal amount of 1.00% convertible notes due 2020, or the Priceline 2020 notes, and US$500 million in aggregate principal amount of 2.00% convertible notes due 2025, or the Priceline 2025 notes, respectively, to Priceline Group Treasury Company B.V., an indirect wholly owned subsidiary of The Priceline Group Inc.. In June 2015, we completed an offering of US$700 million in aggregate principal amount of 1.00% convertible senior notes due 2020, or the 2020 notes, and US$400 million in aggregate principal amount of 1.99% convertible senior notes due 2025, or the 2025 notes. In December 2015, we issued US$500 million in aggregate principal amount of 2.00% convertible notes due 2025, or the Hillhouse 2025 notes, to Gaoling Fund, L.P. and YHG Investment, L.P., or collectively, Hillhouse, in addition to the aforementioned issuance to Priceline. As an offshore holding company, our ability to make loans or additional capital contributions to our PRC operating subsidiaries is subject to PRC regulations and approvals and there are restrictions for us to make loans to our consolidated affiliated Chinese entities. These regulations and approvals may delay or prevent us from using the proceeds we received in the past or will receive in the future from the offerings of securities to make loans or additional capital contributions to our PRC operating subsidiaries and our consolidated affiliated Chinese entities, and impair our ability to fund and expand our business which may adversely affect our business, financial condition and result of operations.

        For example, on March 3, 2015, the SAFE promulgated a Circular on the Reforming of Administrative Methods Regarding the Foreign Exchange Capital Settlement of Foreign- Invested Companies, or Circular 19, which became effective on June 1, 2015 and replaced Circular 142. Originally, pursuant to Circular 142, the registered capital of a foreign invested company settled in RMB converted from foreign currencies may only be used within the business scope approved by the applicable governmental authority and may not be used for equity investments in the PRC, and foreign-invested companies may not change how they use such capital without SAFE's approval, and may not in any case use such capital to repay RMB loans if they have not used the proceeds of such loans. Although Circular 19 restates certain restrictions on the use of investment capital denominated in foreign currency by foreign invested companies, it specifies that the registered capital of a foreign-invested company, denominated in foreign currency, can be converted into RMB at the discretion of such foreign- invested company and can be used for equity investment in the PRC subject to the invested company's filing of a reinvestment registration with the relevant local SAFE. On June 9, 2016, SAFE issued the Circular on Reforming and Regulating the Administrative Policy of the Settlement under Capital Accounts, or Circular 16, which became effective on the same date. Although Circular 16 further extends the reform to cover foreign currency income under capital account, including capital, foreign debt and proceeds from offshore offering and listing, an FIE's foreign currency income and such income settled in RMB under the capital account cannot be used directly and indirectly for any purposes out of the FIE's business scope or in areas prohibited by laws and regulations. However, since Circular 19 and Circular 16 are newly issued, their interpretation and enforcement involve significant uncertainty.

        In light of the various requirements imposed by PRC regulations on loans to and direct investment in PRC entities by offshore holding companies, we cannot assure you that we will be able to complete the necessary government registrations or obtain the necessary government approvals on a timely basis, if at all, with respect to future loans by us to our PRC subsidiaries or with respect to future capital

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contributions by us to our PRC subsidiary. If we fail to complete such registrations or obtain such approvals, our ability to use the proceeds we received from this offering, the Concurrent Shares Private Placements, the concurrent offering of convertible notes and the Concurrent Notes Private Placement, and to capitalize or otherwise fund our PRC operations may be negatively affected, which could materially and adversely affect our liquidity and our ability to fund and expand our business.

We have attempted to comply with the PRC government regulations regarding licensing requirements by entering into a series of agreements with our consolidated affiliated Chinese entities. If the PRC laws and regulations change, our business in China may be adversely affected.

        To comply with the PRC government regulations regarding licensing requirements, we have entered into a series of agreements with our consolidated affiliated Chinese entities to exert our operational control over them and secure consulting fees and other payments from them. Although we have been advised by our PRC counsel, Commerce & Finance Law Offices, that our contractual arrangements with our consolidated affiliated Chinese entities, as described in this prospectus supplement, are valid under current PRC law and regulations, as there is substantial uncertainty regarding the interpretation and application of PRC laws and regulations, we cannot assure you that the PRC government would agree with our counsels' position or that we will not be required to restructure our organizational structure and operations in China to comply with changing and new PRC laws and regulations. Restructuring of our operations may result in disruption of our business, diversion of management attention and the incurrence of substantial costs. See "—Risks Related to Our Corporate Structure—Substantial uncertainties exist with respect to the enactment timetable, interpretation and implementation of draft PRC Foreign Investment Law and how it may impact the viability of our current corporate structure, corporate governance and business operations."

The continued growth of the Chinese Internet market depends on the establishment of an adequate telecommunications infrastructure.

        Although private sector Internet service providers currently exist in China, almost all access to the Internet is maintained through state-owned telecommunication operations under the administrative control and regulatory supervision of the MIIT. In addition, the national networks in China connect to the Internet through government-controlled international gateways. These international gateways are the only channels through which a domestic Chinese user can connect to the international Internet network. We rely on this infrastructure, primarily China Telecom and China Unicom, to provide data communications capacity. Although the government has announced plans to aggressively develop the national information infrastructure, we cannot assure you that this infrastructure will be developed. In addition, we will have no access to alternative networks and services, on a timely basis if at all, in the event of any infrastructure disruption or failure. The Internet infrastructure in China may not support the demands associated with continued growth in Internet usage.

        In addition, we have no control over the costs of the services provided by telecommunication service providers. If the prices we pay for telecommunications and internet services rise significantly, our results of operations may be materially and adversely affected. Furthermore, if internet access fees or other charges to internet users increase, some users may be prevented from accessing the mobile internet and thus cause the growth of mobile internet users to decelerate. Such deceleration may adversely affect our ability to continue to expand our user base and maintain our user experience.

Our auditor, like other independent registered public accounting firms operating in China, is not permitted to be subject to inspection by Public Company Accounting Oversight Board, and as such, investors may be deprived of the benefits of such inspection.

        Our independent registered public accounting firm that issues the audit reports included in our annual reports filed with the SEC, as an auditor of companies that are traded publicly in the

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United States and a firm registered with the Public Company Accounting Oversight Board (United States), or PCAOB, is required by the laws of the United States to undergo regular inspections by PCAOB to assess its compliance with the applicable professional standards. Because our auditor is located in China, a jurisdiction where PCAOB is currently unable to conduct inspections without the approval of the PRC authorities, our auditor, like other independent registered public accounting firms operating in China, is currently not inspected by PCAOB.

        Inspections of other firms that PCAOB has conducted outside of China have identified deficiencies in those firms' audit procedures and quality control procedures, which may be addressed as part of the inspection process to improve future audit quality. The inability of PCAOB to conduct inspections of independent registered public accounting firms operating in China makes it more difficult to regularly evaluate the effectiveness of our auditor's audit procedures or quality control procedures. As a result, investors may be deprived of the benefits of PCAOB inspections.

Proceedings instituted by the SEC against the Big Four PRC-based accounting firms, including our independent registered public accounting firm, could result in our financial statements being determined to not be in compliance with the requirements of the Exchange Act.

        In December 2012, the SEC brought administrative proceedings against the Big Four accounting firms, including our independent registered public accounting firm, in China, alleging that they had refused to produce audit work papers and other documents related to certain other China-based companies under investigation by the SEC for potential accounting fraud. On January 22, 2014, an initial administrative law decision, or Initial Decision, was issued, censuring these accounting firms and suspending four of the five firms from practicing before the SEC for a period of six months. The accounting firms filed a Petition for Review of the Initial Decision to the SEC. On February 6, 2015, the Big Four China-based accounting firms each agreed to a censure and to pay a fine to the SEC to settle the dispute and avoid suspension of their ability to practice before the SEC and audit U.S.-listed companies. The settlement required the firms to follow detailed procedures and to seek to provide the SEC with access to Chinese firms' audit documents via the China Securities Regulatory Commission, or the CSRC. If future document productions fail to meet specified criteria, the SEC retains authority to impose a variety of additional remedial measures on the firms depending on the nature of the failure. While we cannot predict if the SEC will further review the four China-based accounting firms' compliance with specified criteria or if the results of such a review would result in the SEC imposing penalties such as suspensions or restarting the administrative proceedings, if the accounting firms are subject to additional remedial measures, our ability to file our financial statements in compliance with SEC requirements could be impacted. A determination that we have not timely filed financial statements in compliance with SEC requirements could ultimately lead to the delisting of our common stock from NASDAQ or the termination of the registration of our common stock under the Securities Exchange Act of 1934, or both, which would substantially reduce or effectively terminate the trading of our common stock in the United States.

Risks Related to this Offering and Our Ordinary Shares and ADSs

The future sales of a substantial number of ADSs in the public market could adversely affect the price of the ADSs.

        In the future, we may sell additional ADSs to raise capital, and our existing shareholders could sell substantial amounts of the ADSs, including those issued upon the exercise of outstanding options, in the public market. We cannot predict the size of such future issuance or the effect, if any, that they may have on the market price of the ADSs. Any future sales of a substantial number of the ADSs in the public market, or the perception that such issuance and sale may occur, could adversely affect the price of the ADSs and impair our ability to raise capital through the sale of additional equity securities.

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Our management has broad discretion over the use of proceeds from this offering and the Concurrent Shares Private Placements.

        Our management will have significant discretion in applying the net proceeds that we receive from this offering and the Concurrent Shares Private Placements. Although we intend to use the net proceeds from this offering and the Concurrent Shares Private Placements for organic growth of our business, acquisitions of and investments in complementary businesses and assets, and other general corporate purposes, our board of directors retains significant discretion with respect to the use of proceeds. The net proceeds from this offering and the Concurrent Shares Private Placements may be used in a manner that does not generate favorable returns. In addition, if we use all or a portion of the net proceeds for future acquisitions, there can be no assurance that we could successfully integrate any such acquisition into our operations or that the acquired entity or business would perform as expected.

Provisions of our convertible notes could discourage an acquisition of us by a third party.

        As of June 30, 2016, the aggregate principal amount of our outstanding convertible notes was RMB24.5 billion (US$3.7 billion). In addition, we are offering US$900 million principal amount of our 1.25% convertible senior notes due 2022. Certain provisions of our convertible notes could make it more difficult or more expensive for a third party to acquire us. The indentures for these convertible notes define a "fundamental change" to include, among other things: (1) any person or group gaining control of our company; (2) our company merging with or into another company or disposing of substantially all of its assets; (3) any recapitalization, reclassification or change of our ordinary shares or the ADSs as a result of which these securities would be converted into, or exchanged for, stock, other securities, other property or assets; (4) the adoption of any plan relating to the dissolution or liquidation of our company; or (5) our ADSs ceasing to be listed on a major U.S. national securities exchange in certain circumstances, subject to certain exceptions where the applicable consideration comprises U.S.-listed common equity or ADSs. Upon the occurrence of a fundamental change, holders of these notes will have the right, at their option, to require us to repurchase all of their notes or any portion of the principal amount of such notes in integral multiples of US$1,000. In the event of a fundamental change, we may also be required to issue additional ADSs upon conversion of our convertible notes.

As a company incorporated in the Cayman Islands, we are permitted to adopt certain home country practices in relation to corporate governance matters that differ significantly from the NASDAQ corporate governance listing standards; these practices may afford less protection to shareholders than they would enjoy if we complied fully with the NASDAQ corporate governance listing standards.

        As a Cayman Islands company listed on the NASDAQ, we are subject to the NASDAQ corporate governance listing standards. However, NASDAQ rules permit a foreign private issuer like us to follow the corporate governance practices of its home country. Certain corporate governance practices in the Cayman Islands, which is our home country, may differ significantly from the NASDAQ corporate governance listing standards. As we have chosen, or may from time to time to choose, to follow home country practice exemptions with respect to certain corporate matters such as the requirement of majority independent directors on our board of directors, our shareholders may be afforded less protection than they otherwise would under the NASDAQ corporate governance listing standards applicable to U.S. domestic issuers.

You may face difficulties in protecting your interests, and our ability to protect our rights through the U.S. federal courts may be limited, because we are incorporated under Cayman Islands law.

        Our corporate affairs are governed by our memorandum and articles of association and by the Companies Law (2013 Revision) and common law of the Cayman Islands. The rights of our shareholders and the fiduciary duties of our directors under Cayman Islands law are not as clearly

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established as they would be under statutes or judicial precedents in some jurisdictions in the United States. In particular, the Cayman Islands has a less developed body of securities laws as compared to the United States. Therefore, our public shareholders may have more difficulties in protecting their interests in the face of actions by our management, directors or controlling shareholders than would shareholders of a corporation incorporated in a jurisdiction in the United States.

Your ability to bring an action against us or against our directors and officers, or to enforce a judgment against us or them, may be limited because we are incorporated in the Cayman Islands, and because we conduct the majority of our operations in China and because the majority of our directors and officers reside outside of the United States.

        We are incorporated in the Cayman Islands, and we conduct the majority of our operations in China through our wholly owned subsidiaries and several consolidated affiliated Chinese entities in China. Most of our directors and officers reside outside of the United States and most of the assets of those persons are located outside of the United States. As a result, it may be difficult for you to bring an action in the United States upon these persons. It may also be difficult for you to enforce in United States courts judgments obtained in United States courts based on the civil liability provisions of the United States federal securities laws against us and our officers and directors, most of whom are not residents in the United States and the substantial majority of whose assets are located outside of the United States. Even if you are successful in bringing an action of this kind, the laws of the Cayman Islands or China may render you unable to enforce a judgment against our assets or the assets of our directors and officers.

The voting rights of holders of ADSs are limited by the terms of the deposit agreement, and you may not be able to exercise your right to direct how the ordinary shares represented by your ADSs are voted.

        As a holder of ADSs, you will not have any right to attend general meetings of our shareholders or to cast any votes directly at such meetings. You will only be able to exercise the voting rights which attach to the underlying ordinary shares represented by your ADSs indirectly by giving voting instructions to the depositary in accordance with the provisions of the deposit agreement. Under the deposit agreement, you may vote only by giving voting instructions to the depositary, as the registered holder of the underlying ordinary shares which are represented by your ADSs. Upon receipt of your voting instructions, the depositary will endeavor to vote the underlying ordinary shares in accordance with your instructions. You will not be able to directly exercise any right to vote with respect to the underlying shares unless you withdraw the shares and become the registered holder of such shares prior to the record date for the general meeting. Under our memorandum and articles of association, the minimum notice period required to be given by our company to our registered shareholders for convening a general meeting is 7 days. When a general meeting is convened, you may not receive sufficient advance notice to enable you to withdraw the underlying shares represented by your ADSs and become the registered holder of such shares prior to the record date for the general meeting to allow you attend the general meeting and to vote directly with respect to any specific matter or resolution which is to be considered and voted upon at the general meeting. In addition, under our memorandum and articles of association, for the purposes of determining those shareholders who are entitled to attend and vote at any general meeting, our directors may close our register of members and/or fix in advance a record date for such meeting, and such closure of our register of members or the setting of such a record date may prevent you from withdrawing the underlying shares which are represented by your ADSs and becoming the registered holder of such shares prior to the record date, so that you would not be able to attend the general meeting or to vote directly. Where any matter is to be put to a vote at a general meeting, the depositary will endeavor to notify you of the upcoming vote and arrange to deliver our voting materials to you. We cannot assure you that you will receive the voting materials in time to ensure that you can instruct the depositary to vote the underlying shares

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which are represented by 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 direct the voting of the underlying shares which are represented by your ADSs and there may be nothing you can do if the shares underlying your ADSs are not voted as you requested.

        Under our deposit agreement, the depositary will give us a discretionary proxy to vote the ordinary shares underlying your ADSs at shareholders' meetings if you do not vote, unless we have instructed the depositary that we do not wish a discretionary proxy to be given or any of the other situations specified under the deposit agreement takes place. The effect of this discretionary proxy is that you cannot prevent ordinary shares underlying your ADSs from being voted, absent the situations described above, and it may make it more difficult for shareholders to influence the management of our company. Holders of our ordinary shares are not subject to this discretionary proxy.

Your right to participate in any future rights offerings may be limited, which may cause dilution to your holdings.

        We may from time to time distribute rights to our shareholders, including rights to acquire our securities. However, we cannot make rights available to you in the United States unless we register the rights and the securities to which the rights relate under the Securities Act of 1933, as amended, or the Securities Act, or an exemption from the registration requirements is available. Also, under the deposit agreement, the depositary bank will not make these rights available to you unless the distribution to ADS holders of both the rights and any related securities are either registered under the Securities Act, or exempt from registration under the Securities Act. We are under no obligation to file a registration statement with respect to any such rights or securities or to endeavor to cause such a registration statement to be declared effective. Moreover, we may not be able to establish an exemption from registration under the Securities Act. Accordingly, you may be unable to participate in our rights offerings and may experience dilution in your holdings.

You may not receive distributions on ordinary shares or any value for them if it is illegal or impractical to make them available to you.

        The depositary has agreed to pay to you the cash dividends or other distributions it or the custodian receives on ordinary shares or other deposited securities after deducting its fees and expenses. You will receive these distributions in proportion to the number of ordinary 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 register ADSs, ordinary shares, rights or other securities under U.S. securities laws. We also have no obligation to take any other action to permit the distribution of ADSs, ordinary shares, rights or anything else to holders of ADSs. This means that you may not receive the distribution we make on our ordinary shares or any value for 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 transfer of your ADSs.

        Your ADSs are transferable on the books of the depositary. However, the depositary may close its transfer books at any time or from time to time when it deems expedient in connection with the performance of its duties. In addition, the depositary may refuse to deliver, transfer or register transfers of ADSs generally when our books or the books of the depositary are closed, or at any time if we or the depositary thinks it advisable to do so because of any requirement of law or of any government or governmental body, or under any provision of the deposit agreement, or for any other reason.

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Provisions of our shareholder rights plan could delay or prevent an acquisition of our company, even if the acquisition would be beneficial to our shareholders.

        In November 2007, we adopted a shareholder rights plan, which was subsequently amended. See also "Description of Share Capital—Shareholder Rights Plan" in the accompanying prospectus. Although the rights plan will not prevent a takeover, it is intended to encourage anyone seeking to acquire our company to negotiate with our board of directors prior to attempting a takeover by potentially significantly diluting an acquirer's ownership interest in our outstanding shares. The existence of the rights plan may also discourage transactions that otherwise could involve payment of a premium over prevailing market prices for the ADSs.

We may be classified as a passive foreign investment company, which could result in adverse United States federal income tax consequences for U.S. Holders.

        Based on the market price of the ADSs and our ordinary shares, the value of our assets, and the composition of our assets and income, we do not believe that we were a passive foreign investment company (a "PFIC") for United States federal income tax purposes for our taxable year ended December 31, 2015. Although it is not certain, our current expectation is that we will not be a PFIC for our taxable year ending December 31, 2016. The application of the PFIC rules is subject to ambiguity in several respects and, in addition, we must make annual separate determination each year as to whether we are a PFIC (after the close of each taxable year). Accordingly, we cannot assure you of our PFIC status for our current taxable year ending December 31, 2016 or for any future taxable year.

        A non-U.S. corporation will be considered a PFIC for any taxable year if either (i) at least 75% of its gross income is passive income or (ii) at least 50% of the value of its assets (based on an average of the quarterly values of the assets during a taxable year) is attributable to assets that produce, or are held for the production of, passive income. The value of our assets generally will be determined by reference to the market price of the ADSs and ordinary shares, which may fluctuate considerably. If we were treated as a PFIC for any taxable year during which a U.S. Holder held an ADS or an ordinary share, certain adverse United States federal income tax consequences could apply to the U.S. Holder (as defined herein). For a more detailed discussion of United States federal income tax consequences to U.S. Holders, see "Item 10. Additional Information—Taxation—United States Federal Income Tax Considerations—Passive Foreign Investment Company Rules" in our 2015 Annual Report, which is incorporated by reference in this prospectus supplement and the accompanying prospectus.

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