Filed Pursuant to Rule 424(b)(5)

Registration No. 333-254035

The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement isnot an offer to sell the securities and is not soliciting offers to buy the securities in any jurisdiction where the offer or sale is not permitted.

SUBJECT TO COMPLETION, DATED March 11, 2021

Preliminary Prospectus Supplement

(To Prospectus datedMarch 9, 2021)

Baidu, Inc.

95,000,000 Class A Ordinary Shares

We are offering 95,000,000 Class A ordinary shares, par value US$0.000000625 per share, as part of a global offering, or the GlobalOffering, consisting of an international offering of 90,250,000 Class A ordinary shares offered hereby, and a Hong Kong public offering of 4,750,000 Class A ordinary shares. The public offering price for the international offering and theHong Kong public offering is HK$            per Class A ordinary share, or approximately US$             per Class Aordinary share based on an exchange rate of HK$7.7534 to US$1.00.

Our ADSs are listed on the Nasdaq Global Select Market, or Nasdaq, underthe symbol “BIDU.” On March 10, 2021, the last reported trading price of our ADSs on Nasdaq was US$255.14 per ADS, or HK$242.28 per Class A ordinary share, based upon an exchange rate of HK$7.7534 to US$1.00. Each ADS represents eightClass A ordinary shares.

We will determine the offer price for both the international offering and the Hong Kong public offering byreference to, among other factors, the closing price of our ADSs on the last trading day before the pricing of the global offering, which is expected to be on or about March 17, 2021. The maximum offer price for the Hong Kong public offering isHK$295.00, or US$38.05, per Class A ordinary share (equivalent to US$304.38 per ADS).

The allocation of Class A ordinary sharesbetween the international offering and the Hong Kong public offering is subject to reallocation. For more information, see “Underwriting” beginning on page S-44 of this prospectus supplement. Thepublic offering price in the international offering may differ from the public offering price in the Hong Kong public offering. See “Underwriting—Pricing.” The international offering contemplated herein consists of a U.S. offering anda non-U.S. offering made outside the United States in compliance with applicable law. We are paying a registration fee for Class A ordinary shares sold in the United States, as well as for Class Aordinary shares initially offered and sold outside the United States in the Global Offering that may be resold from time to time into the United States.

We have applied to list our Class A ordinary shares on the Hong Kong Stock Exchange pursuant to Chapter 19C of the Hong Kong StockExchange Listing Rules under the stock code “9888.”

See“Risk Factors” beginning on page S-15 for a discussion of certain risks that should be considered in connection with an investment in ourClass A ordinary shares.

Neither the United States Securities and Exchange Commission (the “SEC”) nor any statesecurities commission has approved or disapproved of these securities or determined that this prospectus supplement or the accompanying prospectus is accurate or complete. Any representation to the contrary is a criminal offense.

PRICE HK$         PER CLASS A ORDINARY SHARE

We have granted theinternational underwriters the option, exercisable by Merrill Lynch (Asia Pacific) Limited, CLSA Limited and Goldman Sachs (Asia) L.L.C., or the Joint Representatives, on behalf of the international underwriters, to purchase up to an additional14,250,000 ordinary shares at the public offering price until 30 days after the last day for the lodging of applications under the Hong Kong public offering. Merrill Lynch (Asia Pacific) Limited, through its affiliate Merrill Lynch International,expects to enter into a borrowing arrangement with Baidu Holdings Limited to facilitate the settlement of over-allocations. Merrill Lynch International is obligated to return Class A ordinary shares to Baidu Holdings Limited by exercising theoption to purchase additional Class A ordinary shares from us or by making purchases in the open market. No fees or other remuneration will be paid by the underwriters to us or Baidu Holdings Limited for the loan of these Class A ordinaryshares.

The underwriters expect to deliver the Class A ordinary shares against payment therefor through the facilities of the CentralClearing and Settlement System on or around             , 2021.

JointSponsors, Joint Global Coordinators, Joint Bookrunners and Joint Lead Managers

(In alphabetical order)

Joint Global Coordinators, Joint Bookrunners and Joint Lead Managers

Joint Bookrunners and Joint Lead Managers

The date of this prospectus supplement is            , 2021.

TABLE OF CONTENTS

Prospectus Supplement

Prospectus

You should rely only on the information contained or incorporated by reference in this prospectussupplement and the accompanying prospectus. We have not, Baidu Holdings Limited has not, and the underwriters have not, authorized any other person to provide you with different information. If anyone provides you with different or inconsistentinformation, you should not rely on it. None of the underwriters, Baidu Holdings Limited or us is making an offer to sell the securities in any jurisdiction where the offer or sale is not permitted. You should assume that the information appearingin this prospectus supplement, the accompanying prospectus and the documents incorporated by reference is accurate only as of each of their respective dates. Our business, financial condition, results of operations and prospects may have changedsince those dates. Neither this prospectus supplement nor the accompanying prospectus constitutes an offer, or an invitation on our behalf or the underwriter to subscribe for and purchase, any of the ordinary shares and may not be used for or inconnection with an offer or solicitation by anyone, in any jurisdiction in which such an offer or solicitation is not authorized or to any person to whom it is unlawful to make such an offer or solicitation.

ABOUT THIS PROSPECTUS SUPPLEMENT

This document consists of two parts. The first part is this prospectus supplement, which describes the specific terms of the Global Offeringand other matters relating to us and our financial condition. The second part, the base prospectus, presents more general information about this offering. The base prospectus was included in the registration statement on Form F-3 (File No. 333-254035) that we filed with the SEC on March 9, 2021 and has been updated since that time with additional information that is incorporated byreference. Generally, when we refer only to the “prospectus,” we are referring to both parts combined, and when we refer to the “accompanying prospectus,” we are referring to the base prospectus as updated through incorporationby reference.

If information in this prospectus supplement differs from information in the accompanying prospectus, you should rely onthe information in this prospectus supplement.

Other than the Hong Kong public offering, no action is being taken in any jurisdictionoutside the United States to permit a public offering of the ordinary shares, and no action is being taken in any jurisdiction outside the United States to permit the possession or distribution of this prospectus supplement or the accompanyingprospectus in that jurisdiction. Persons who come into possession of this prospectus supplement or the accompanying prospectus in jurisdictions outside the United States are required to inform themselves about and to observe any restrictions as tothe Global Offering (as defined in the prospectus supplement under the caption “Underwriting”) and the distribution of this prospectus supplement and the accompanying prospectus applicable to that jurisdiction.

You should not consider any information in this prospectus supplement or the accompanying prospectus to be investment, legal or tax advice.You should consult your own counsel, accountants and other advisors for legal, tax, business, financial and related advice regarding the purchase of any of the securities offered by this prospectus supplement.

In this prospectus supplement, unless otherwise indicated or unless the context otherwise requires,

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Our reporting currency is RMB. Unless otherwise noted, all translations from RMB to U.S. dollars in this prospectussupplement are made at a rate of RMB6.5250 to US$1.00, the exchange rate in effect as of December 31, 2020 as set forth in the H.10 statistical release of The Board of Governors of the Federal Reserve System. We make no representation that anyRMB amounts could have been, or could be, converted into U.S. dollars at any particular rate, or at all. On March 5, 2021, the exchange rate was RMB6.4960 to US$1.00.

All discrepancies in any table between the amounts identified as total amounts and the sum of the amounts listed therein are due to rounding.

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WHERE YOU CAN FIND MORE INFORMATION

We are subject to the reporting requirements of the Securities Exchange Act of 1934, as amended, or the Exchange Act, and, in accordance withthe Exchange Act, we file annual reports and other information with the SEC. Information we file with the SEC can be obtained over the internet at the SEC’s website at www.sec.gov.

This prospectus supplement is part of a registration statement that we filed with the SEC, using a “shelf” registration processunder the Securities Act of 1933, as amended, or the Securities Act, relating to the securities to be offered. This prospectus supplement does not contain all of the information set forth in the registration statement, certain parts of which areomitted in accordance with the rules and regulations of the SEC. For further information with respect to Baidu, Inc. and the securities, reference is hereby made to the registration statement and the prospectus contained therein. The registrationstatement, including the exhibits thereto, may be inspected on the SEC’s website.

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INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

The SEC allows us to “incorporate by reference” the information we file with or submit to the SEC, which means that we can discloseimportant information to you by referring you to those documents that are considered part of the accompanying prospectus. Information that we file with or submit to the SEC in the future and incorporate by reference will automatically update andsupersede the previously filed information. See “Incorporation of Certain Documents by Reference” in the accompanying prospectus for more information. All of the documents incorporated by reference are available at www.sec.gov under Baidu,Inc., CIK number 0001329099.

Our annual report on Form 20-F for the fiscal year ended December 31, 2020 filed with the SEC on March 9, 2021 (File No. 000-51469), or our 2020 Form 20-F, and our current report on Form 6-K furnished to the SEC on March 9, 2021(File No. 000-51469) are incorporated by reference into the accompanying prospectus.

As youread the documents incorporated by reference, you may find inconsistencies in information from one document to another. If you find inconsistencies, you should rely on the statements made in the most recent document.

We will provide a copy of any or all of the information that has been incorporated by reference into the accompanying prospectus, upon writtenor oral request, to any person, including any beneficial owner of the securities, to whom a copy of this prospectus supplement is delivered, at no cost to such person. You may make such a request by writing or telephoning us at the following mailingaddress or telephone number:

Baidu, Inc.

Baidu Campus

No. 10 Shangdi10th Street

Haidian District, Beijing 100085

The People’s Republic of China

+86 (10) 5992-8888

Attention: Investor Relation

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FORWARD-LOOKING STATEMENTS

This prospectus supplement, the accompanying prospectus and the documents incorporated by reference contain forward-looking statements thatreflect our current expectations and views of future events. These statements are made under the “safe harbor” provisions of the U.S. Private Securities Litigation Reform Act of 1995. You can identify these forward-looking statements byterminology such as “may,” “will,” “expect,” “anticipate,” “aim,” “intend,” “plan,” “believe,” “estimate,” “is/are likely to,” “future,”“potential,” “continue” or other similar expressions. We have based these forward-looking statements largely on our current expectations and projections about future events and financial trends that we believe may affect ourfinancial condition, results of operations, business strategy and financial needs. These forward-looking statements include statements relating to, among other things:

The forward-looking statements included in this prospectus supplement, in the accompanying prospectus and in the documents incorporated byreference therein are subject to risks, uncertainties and assumptions about our company. Our actual results of operations may differ materially from the forward-looking statements as a result of the risk factors disclosed in this prospectussupplement, in the accompanying prospectus and in the documents incorporated by reference therein.

We would like to caution you not toplace undue reliance on these forward-looking statements. You should read these statements in conjunction with the risk factors disclosed herein, in the accompanying prospectus and in the documents incorporated by reference therein for a morecomplete discussion of the risks of an investment in our securities. We operate in a rapidly evolving environment. New risks emerge from time to time and it is impossible for our management to predict all risk factors, nor can we assess the impactof all factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ from those contained in any forward-looking statement. We do not undertake any obligation to update or revise theforward-looking statements except as required under applicable law.

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RISK FACTORS

Any investment in our Class A ordinary shares involves a high degree of risk. You should carefully consider the risk factors set forthbelow together with the other information contained in this prospectus supplement, the accompanying prospectus and the documents incorporated by reference, before deciding whether to purchase the ordinary shares. In addition, you should carefullyconsider the matters discussed under “Risk Factors” in our 2020 Form 20-F and our current report on Form 6-K furnished to the SEC on March 9, 2021, as well asother documents incorporated by reference into this prospectus supplement. Any of the following risks and the risks described in the annual report, and additional risks and uncertainties not currently known to us or those we currently view to beimmaterial, may also materially and adversely affect our business, financial condition or results of operations. In such case, you may lose all or part of your original investment.

Risks Related to Our Shares, ADSs and the Global Offering

As a company applying for listing under Chapter 19C, we adopt different practices as to certain matters as compared with many other companies listed onthe Hong Kong Stock Exchange.

As we are applying for listing under Chapter 19C of the Rules Governing the Listing of Securities onThe Stock Exchange of Hong Kong Limited, or the Hong Kong Listing Rules, we will not be subject to certain provisions of the Hong Kong Listing Rules pursuant to Rule 19C.11, including, among others, rules on notifiable transactions, connectedtransactions, share option schemes, content of financial statements as well as certain other continuing obligations. In addition, in connection with the Listing, we have applied for a number of waivers and/or exemptions from strict compliance withthe Hong Kong Listing Rules, the Companies (Winding Up and Miscellaneous Provisions) Ordinance, the Takeovers Codes and the SFO. As a result, we will adopt different practices as to those matters as compared with other companies listed on the HongKong Stock Exchange that do not enjoy those exemptions or waivers.

Our articles of association are specific to us and include certainprovisions that may be different from the requirements under the Hong Kong Listing Rules and common practices in Hong Kong. For example, Rule 19C.07(7) of the Hong Kong Listing Rules provides that the minimum stake required to convene anextraordinary general meeting and add resolutions to a meeting agenda must not be higher than 10% of the voting rights, on a one vote per share basis, in the share capital of a qualifying issuer, but our articles of association provide that not lessthan a majority of the aggregate voting power of our company is required to convene an extraordinary general meeting. We will convene an extraordinary general meeting by December 31, 2021, and put forth a resolution to revise our articles ofassociation to comply with Rule 19C.07(7) of the Hong Kong Listing Rules. Prior to the amendment to our articles of association, we undertake to convene general meetings at the request of shareholders holding in aggregate not less than 10% of ourcompany’s voting rights, on a one vote per share basis.

Furthermore, if 55% or more of the total worldwide trading volume, by dollarvalue, of our Class A ordinary shares and ADSs over our most recent fiscal year takes place on the Hong Kong Stock Exchange, the Hong Kong Stock Exchange will regard us as having a dual primary listing in Hong Kong and we will no longer enjoycertain exemptions or waivers from strict compliance with the requirements under the Hong Kong Listing Rules, the Companies (Winding Up and Miscellaneous Provisions) Ordinance, the Takeovers Codes and the SFO, which could result in us having toamend our corporate structure and articles of association and our incurring of incremental compliance costs.

The trading price of our ADSs has beenand is likely to continue to be, and the trading price of our Class A ordinary shares can be, volatile regardless of our operating performance.

The trading price of our ADSs has been and is likely to continue to be volatile, and could fluctuate widely in response to a variety offactors, many of which are beyond our control. Likewise, the trading price of our Class A ordinary shares can be volatile for similar or different reasons.

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Factors impacting the price and trading volume of our listed securities include, but are notlimited to, the following:

In addition, the stock market in general, and the performance and fluctuation of the market prices for internet-related companies and othercompanies with operations mainly in China in particular, may affect the volatility in the prices of and trading volumes for our securities. The securities of some China-based companies that have listed their securities in the United States and/orHong Kong have experienced significant volatility that often has been unrelated to the operating performance of such companies, including, in some cases, substantial declines in the trading prices of their securities. The trading performances ofthese companies’ securities may affect the attitudes of investors towards Chinese companies listed in the United States and/or Hong Kong in general, which consequently may impact the trading performance of our securities, regardless of ouractual operating performance. In addition, any negative news or perceptions about inadequate corporate governance practices or fraudulent accounting, corporate structure or other matters of other Chinese companies may also negatively affect theattitudes of investors towards Chinese companies in general, including us, regardless of whether we have engaged in any inappropriate activities. In particular, the global financial crisis, the ensuing economic recessions and deterioration in thecredit market in many countries have contributed and may continue to contribute to extreme volatility in the global stock markets. These broad market and industry fluctuations may adversely affect the market price of our securities. Volatility or alack of positive performance in the price of our listed securities may also adversely affect our ability to retain key employees, most of whom have been granted options or other equity incentives.

Substantial future sales or perceived potential sales of our Class A ordinary shares and/or ADSs in the public market could cause the price of ourClass A ordinary shares and/or ADSs to decline.

Sales of our Class A ordinary shares and/or ADSs in the public market,or the perception that these sales could occur, could cause the market price of our Class A ordinary shares and/or ADSs to decline. Such sales also might make it more difficult for us to sell equity or equity-related securities in the future ata time and price that we deem appropriate. If any existing shareholder or shareholders sell a substantial amount of our Class A ordinary shares and/or ADSs, the prevailing market price for our Class A ordinary shares and/or ADSs could be

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adversely affected. In addition, if we pay for our future acquisitions in whole or in part with additionally issued ordinary shares, your ownership interests in our company would be diluted andthis, in turn, could have a material and adverse effect on the price of our Class A ordinary shares and/or ADSs.

If securities or industryanalysts do not publish research or publish inaccurate or unfavorable research about our business, the market price for our Class A ordinary shares and/or ADSs and trading volume could decline.

The trading market for our Class A ordinary shares and/or ADSs will depend in part on the research and reports that securities or industryanalysts publish about us or our business. If research analysts do not maintain adequate research coverage or if one or more of the analysts who covers us downgrades our Class A ordinary shares and/or ADSs or publishes inaccurate or unfavorableresearch about our business, the market price for our Class A ordinary shares and/or ADSs would likely decline. If one or more of these analysts cease coverage of our company or fail to publish reports on us regularly, we could lose visibilityin the financial markets, which, in turn, could cause the market price of or trading volume for our Class A ordinary shares and/or ADSs to decline.

Techniques employed by short sellers may drive down the market price of our listed securities.

Short selling is the practice of selling securities that a seller does not own but rather has borrowed from a third party with the intention ofbuying identical securities back at a later date to return to the lender. Short sellers hope to profit from a decline in the value of the securities between the sale of the borrowed securities and the purchase of the replacement shares, as shortsellers expect to pay less in that purchase than they received in the sale. As it is in short sellers’ interest for the price of the security to decline, many short sellers publish, or arrange for the publication of, negative opinions andallegations regarding the relevant issuer and its business prospects in order to create negative market momentum and generate profits for themselves after selling a security short. These short attacks have, in the past, led to selling of shares inthe market.

Public companies listed in the United States that have substantially all of their operations in China have been the subjectof short selling. Much of the scrutiny and negative publicity has centered on allegations of a lack of effective internal control over financial reporting resulting in financial and accounting irregularities and mistakes, inadequate corporategovernance policies or a lack of adherence thereto and, in many cases, allegations of fraud. As a result, many of these companies are now conducting internal and external investigations into the allegations and, in the interim, are subject toshareholder lawsuits and/or SEC enforcement actions.

iQIYI was subject to allegations made in the short seller report published byWolfpack Research. In November 2020, we entered into definitive agreements with JOYY Inc. and certain of its affiliates to acquire YY Live. Muddy Waters published a short selling report on November 18, 2020 against JOYY Inc. Based on publicrecords, JOYY Inc. and certain of its current and former officers and directors were named as defendants in a federal putative securities class action filed in November 2020 alleging that they made material misstatements and omissions in documentsfiled with the SEC regarding certain of the allegations contained in the Muddy Waters short seller report. We may also become the subject of other short seller attacks from time to time in the future and class actions or regulatory enforcementactions derivative of such short seller attacks or actions of a similar nature. Any such allegations may be followed by periods of instability in the market price of our ordinary shares and ADSs and negative publicity. If and when we become thesubject of any unfavorable allegations, whether such allegations are proven to be true or untrue, we may have to expend a significant amount of resources to investigate such allegations and/or defend ourselves, including in connection with classactions or regulatory enforcement actions derivative of such allegations. While we would strongly defend against any such short seller attacks, we may be constrained in the manner in which we can proceed against the relevant short sellers byprinciples of freedom of speech, applicable state law or issues of commercial confidentiality. Such a situation could be costly and time-consuming, and could divert management’s attention from the day-to-day operations of our company. Even if such allegations are ultimately proven to be groundless, allegations against us could severely impact the market price of our securities and our businessoperations.

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We cannot guarantee that any share repurchase program will be fully consummated or that any sharerepurchase program will enhance long-term shareholder value, and share repurchases could increase the volatility of the price of our Class A ordinary shares and/or ADSs and could diminish our cash reserves.

Our board of director have authorized a few share repurchase programs in recent years, some of which had not been fully consummated:

Our board of directors also has the discretion to authorize additional share repurchase programs in the future. Theshare repurchase programs do not obligate us to repurchase any specific dollar amount or to acquire any specific number of ADSs and/or shares. We cannot guarantee that any share repurchase program will enhance long-term shareholder value. The sharerepurchase programs could affect the price of our securities and increase volatility, and may be suspended or terminated at any time, which may result in a decrease in the trading price of our securities. Furthermore, share repurchases couldincrease the volatility of the price of our Class A ordinary shares and/or ADSs and could diminish our cash reserves.

Because we do not expectto pay dividends in the foreseeable future, you must rely on price appreciation of our Class A ordinary shares and/or ADSs for return on your investment.

We currently do not expect to pay any cash dividends in the foreseeable future. Therefore, you should not rely on an investment in ourClass A ordinary shares and/or ADSs as a source for any future dividend income.

Our board of directors has complete discretion as towhether to distribute dividends. In addition, our shareholders may by ordinary resolution declare a dividend, but no dividend may exceed the amount recommended by our board of directors. In either case, the declaration of dividend will be subject toour memorandum and articles of association and certain restrictions under Cayman Islands law. Even if our board of directors decides to declare and pay dividends, the timing, amount and form of future dividends, if any, will depend on, among otherthings, our future results of operations and cash flow, our capital requirements and surplus, the amount of distributions, if any, received by us from our subsidiaries, our financial condition, contractual restrictions and other factors deemedrelevant by our board of directors. Accordingly, the return on your investment in our Class A ordinary shares and/or ADSs will likely depend entirely upon any future price appreciation of our Class A ordinary shares and/or ADSs. There isno guarantee that our Class A ordinary shares and/or ADSs will appreciate in value or even maintain the price at which you purchased the Class A ordinary shares and/or ADSs. You may not realize a return on your investment in ourClass A ordinary shares and/or ADSs and you may even lose your entire investment in our Class A ordinary shares and/or ADSs.

Holders ofour ADSs may not have the same voting rights as the holders of our ordinary shares and may not receive voting materials in time to be able to exercise their right to vote.

Holders of our ADSs will not be able to exercise directly voting rights attached to the shares evidenced by our ADSs on an individual basis.Holders of our ADSs will appoint the depositary or its nominee as their

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representative to exercise the voting rights attached to the shares represented by the ADSs. Holders of our ADSs may not receive voting materials in time to instruct the depositary to vote, andit is possible that such holders, or persons who hold their ADSs through brokers, dealers or other third parties, will not have the opportunity to exercise a right to vote. Upon our written request, the depositary will mail to holders of our ADSs ashareholder meeting notice which contains, among other things, a statement as to the manner in which such holders’ voting instructions may be given, including an express indication that such instructions may be given or deemed given to thedepositary to give a discretionary proxy to a person designated by us if no instructions are received by the depositary from the holders on or before the response date established by the depositary. However, no voting instruction will be deemedgiven and no such discretionary proxy will be given with respect to any matter as to which we inform the depositary that (i) we do not wish such proxy given, (ii) substantial opposition exists, or (iii) such matter materially andadversely affects the rights of shareholders.

Holders of our ADSs, and holders of ordinary shares located in the United States, may not be able toparticipate in rights offerings and may experience dilution of their holdings as a result.

We may from time to time distributerights to our shareholders, including rights to acquire our securities. Under the deposit agreement for the ADSs, the depositary will not offer those rights to ADS holders unless both the rights and the underlying securities to be distributed to ADSholders are either registered under the Securities Act of 1933, or exempt from registration under the Securities Act with respect to all holders of ADSs. Holders of ordinary shares located in the United States also cannot exercise rights unless therights and the underlying shares are so regulated. We are under no obligation to file a registration statement with respect to any such rights or underlying securities or to endeavor to cause such a registration statement to be declared effective.In addition, we may not be able to take advantage of any exemptions from registration under the Securities Act. Accordingly, holders of our ADSs, and holders of ordinary shares located in the United States, may be unable to participate in our rightsofferings and may experience dilution in their holdings as a result.

Holders of our ADSs may not receive cash dividends if the depositary decidesit is impractical to make them available to them.

The depositary will pay cash dividends on the ADSs only to the extent that wedecide to distribute dividends on our Class A ordinary shares or other deposited securities, and we do not have any present plan to pay any cash dividends on our ordinary shares in the foreseeable future. To the extent that there is adistribution, the depositary of our ADSs has agreed to pay to holders of our ADSs the cash dividends or other distributions it or the custodian receives on our Class A ordinary shares or other deposited securities after deducting its fees andexpenses. ADS holders will receive these distributions in proportion to the number of Class A ordinary shares their ADSs represent. However, the depositary may, at its discretion, decide that it is inequitable or impractical to make adistribution available to any holders of ADSs. In these cases, the depositary may decide not to distribute such property to holders of our ADSs.

Holders of our ADSs may be subject to limitations on transfer of their ADSs.

The ADSs are transferable on the books of the depositary. However, the depositary may close its transfer books at any time or from time to timewhen 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 ifwe or the depositary deems 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.

Certain judgments obtained against us by our shareholders may not be enforceable.

We are incorporated in the Cayman Islands, and conduct most of our operations in China through our subsidiaries and consolidated affiliatedentities in China. All of our executive officers and a majority of our

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directors do not reside in the United States or Hong Kong and some or all of the assets of these persons are not located in the United States or Hong Kong. As a result, it may not be possible toeffect service of process within the United States, Hong Kong or elsewhere outside of China upon our executive officers, including with respect to matters arising under U.S. federal securities laws or applicable state securities laws, Hong Kong lawsor otherwise.

It may also be difficult or impossible for you to bring an action against us or against our directors and executiveofficers in the Cayman Islands or in China in the event that you believe that your rights have been infringed under the securities laws or otherwise. Even if you are successful in bringing an action of this kind, the laws of the Cayman Islands andof China may render you unable to enforce a judgment against our assets or the assets of our directors and executive officers.

Althoughthere is no statutory enforcement in the Cayman Islands of judgments obtained in the Hong Kong courts or federal or state courts of the United States (and the Cayman Islands are not a party to any treaties for the reciprocal enforcement orrecognition of such judgments), a judgment obtained in such jurisdiction will be recognized and enforced in the courts of the Cayman Islands at common law, without any re-examination of the merits of theunderlying dispute, by an action commenced on the foreign judgment debt in the Grand Court of the Cayman Islands, provided such judgment (i) is given by a foreign court of competent jurisdiction, (ii) imposes on the judgment debtor aliability to pay a liquidated sum for which the judgment has been given, (iii) is final, (iv) is not in respect of taxes, a fine or a penalty, and (v) was not obtained in a manner and is not of a kind the enforcement of which iscontrary to natural justice or the public policy of the Cayman Islands. However, the Cayman Islands courts are unlikely to enforce a judgment obtained from the U.S. or Hong Kong courts under civil liability provisions of the U.S. federal securitieslaw or Hong Kong law if such judgment is determined by the courts of the Cayman Islands to give rise to obligations to make payments that are penal or punitive in nature. Because such a determination has not yet been made by a court of the CaymanIslands, it is uncertain whether such civil liability judgments from U.S. or Hong Kong courts would be enforceable in the Cayman Islands.

Our corporate affairs are governed by our memorandum and articles of association and by the Companies Act (2021 Revision) and common law ofthe Cayman Islands. The rights of shareholders to take legal action against our directors and us, actions by minority shareholders and the fiduciary responsibilities of our directors to us under Cayman Islands law are to a large extent governed bythe common law of the Cayman Islands. The common law of the Cayman Islands is derived in part from comparatively limited judicial precedent in the Cayman Islands as well as from English common law, which has persuasive, but not binding, authority ona court in the Cayman Islands. The rights of our shareholders and the fiduciary duties of our directors under Cayman Islands law are not as clearly established as they would be under statutes or judicial precedents in the United States. Inparticular, the Cayman Islands has a less developed body of securities laws as compared to the United States, and provides significantly less protection to investors. In addition, Cayman Islands companies may not have standing to initiate ashareholder derivative action before the federal courts of the United States.

The recognition and enforcement of foreign judgments areprovided for under the PRC Civil Procedures Law. PRC courts may recognize and enforce foreign judgments in accordance with the requirements of the PRC Civil Procedures Law based either on treaties between China and the country where the judgment ismade or on principles of reciprocity between jurisdictions. China does not have any treaties or other forms of reciprocity with the United States that provide for the reciprocal recognition and enforcement of foreign judgments. In addition,according to the PRC Civil Procedures Law, the PRC courts will not enforce a foreign judgment against us or our director and officers if they decide that the judgment violates the basic principles of PRC laws or national sovereignty, security orpublic interest. As a result, it is uncertain whether and on what basis a PRC court would enforce a judgment rendered by a court in the United States.

As a result of all of the above, our public shareholders may have more difficulty in protecting their interests through actions against ourmanagement, directors or major shareholders than would shareholders of a corporation incorporated in a jurisdiction in the United States or in Hong Kong.

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Since we are a Cayman Islands exempted company, the rights of our shareholders may be more limitedthan those of shareholders of a company organized in the United States or Hong Kong.

Under the laws of some jurisdictions in theUnited States, majority and controlling shareholders generally have certain fiduciary responsibilities to the minority shareholders. Shareholder action must be taken in good faith, and actions by controlling shareholders which are obviouslyunreasonable may be declared null and void. Cayman Islands law protecting the interests of minority shareholders may not be as protective in all circumstances as the law protecting minority shareholders in some U.S. jurisdictions. In addition, thecircumstances in which a shareholder of a Cayman Islands company may sue the company derivatively, and the procedures and defenses that may be available to the company, may result in the rights of shareholders of a Cayman Islands company being morelimited than those of shareholders of a company organized in the United States.

Furthermore, our directors have the power to take certainactions without shareholder approval which would require shareholder approval under Hong Kong law or the laws of most U.S. jurisdictions. The directors of a Cayman Islands company, without shareholder approval, may implement a sale of any assets,property, part of the business, or our securities. Our ability to create and issue new classes or series of shares without shareholders’ approval could have the effect of delaying, deterring or preventing a change in control without any furtheraction by our shareholders, including a tender offer to purchase our ordinary shares at a premium over then current market prices.

Furthermore, our memorandum and articles of association are specific to us and include certain provisions that may be different from commonpractices in Hong Kong, such as the absence of requirements that the appointment, removal and remuneration of auditors must be approved by a majority of our shareholders.

Our dual-class ordinary share structure with different voting rights could discourage others from pursuing any change of control transactions thatholders of our Class A ordinary shares and ADSs may view as beneficial.

Our ordinary shares are divided into Class A ordinaryshares and Class B ordinary shares. Holders of Class A ordinary shares are entitled to one vote per share, while holders of Class B ordinary shares are entitled to ten votes per share. We issued Class A ordinary sharesrepresented by our ADSs in our initial public offering. Our co-founder, chairman and chief executive officer, Robin Yanhong Li, who acquired our shares prior to our initial public offering, holds ourClass B ordinary shares. Each Class B ordinary share is convertible into one Class A ordinary share at any time by the holder thereof, while Class A ordinary shares are not convertible into Class B ordinary shares under anycircumstances. Upon any transfer of Class B ordinary shares by a holder thereof to any person or entity which is not an affiliate (as defined in our memorandum and articles of association) of such holder, such Class B ordinary shares willbe automatically and immediately converted into the equal number of Class A ordinary shares. In addition, if at any time Robin Yanhong Li and his affiliates (as defined in our memorandum and articles of association) collectively own less than5% of the total number of the issued and outstanding Class B ordinary shares, each issued and outstanding Class B ordinary share will be automatically and immediately converted into one Class A ordinary share, and we shall not issueany Class B ordinary shares thereafter.

Due to the disparate voting powers attached to these two classes, certain shareholders havesignificant voting power over matters requiring shareholder approval, including election of directors and significant corporate transactions, such as a merger or sale of our company or our assets. This concentrated control could discourage orprevent others from pursuing any potential merger, takeover or other change of control transactions with our company, which could deprive our shareholders and ADS holders of an opportunity to receive a premium for their shares or ADSs as part of asale of our company and might reduce the price of our listed securities.

As we are seeking a listing as a Grandfathered Greater ChinaIssuer pursuant to Chapter 19C of the Hong Kong Listing Rules (Secondary Listings of Qualifying Issuers) with a dual-class structure, certain shareholder

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protection measures and governance safeguards under Chapter 8A of the Hong Kong Listing Rules (Weighted Voting Rights) do not apply to us pursuant to Rule 19C.12 and our articles of associationdiffer from Chapter 8A in a number of ways. As a result, our articles of association provide less shareholder protection and have fewer governance safeguards than if our company were subject to Chapter 8A in its entirety.

Our articles of association contain anti-takeover provisions that could adversely affect the rights of holders of our ordinary shares and ADSs.

Our articles of association include certain provisions that could limit the ability of others to acquire control of our company,and therefore may deprive the holders of our ordinary shares and ADSs of the opportunity to sell their ordinary shares or ADSs at a premium over the prevailing market price by discouraging third parties from seeking to obtain control of our companyin a tender offer or similar transactions. These provisions include the following:

We are a foreign private issuer within the meaning of the rules under the U.S. Exchange Act, and as such we are exempt from certain provisionsapplicable to U.S. domestic public companies.

Because we qualify as a foreign private issuer under the U.S. Exchange Act, we areexempt from certain provisions of the securities rules and regulations in the United States that are applicable to U.S. domestic issuers, including:

We are required to file an annual report on Form 20-F within four months of theend of each fiscal year. In addition, we intend to publish our results on a quarterly basis as press releases, distributed pursuant to the rules and regulations of Nasdaq. Press releases relating to financial results and material events will also befurnished to the SEC on Form 6-K. However, the information we are required to file with or furnish to the SEC will be less extensive and less timely compared to that required to be filed with the SEC by U.S.domestic issuers. As a result, you may not be afforded the same protections or information that would be made available to you were you investing in a U.S. domestic issuer.

As a Cayman Islands exempted company listed on Nasdaq, we are subject to Nasdaq corporate governance listing standards. However, Nasdaq rulespermit 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

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is our home country, may differ significantly from Nasdaq corporate governance listing standards. For example, neither the Companies Act (2021 Revision) of the Cayman Islands nor our Memorandumand Articles requires a majority of our directors to be independent and we could include non-independent directors as members of our compensation committee and nominating committee, and our independentdirectors would not necessarily hold regularly scheduled meetings at which only independent directors are present. We follow home country practice with respect to annual meetings and do not hold an annual meeting of shareholders every year. Weundertake we will (i) put forth a resolution at an extraordinary general meeting to be convened by December 31, 2021, or the 2021 EGM, to revise our articles of association so that we are required to convene an annual generalmeeting each year; (ii) the event that this resolution is not passed at the 2021 EGM, to convene an annual general meeting each year with at least 14 days of notice beginning from 2022 and (iii) for so long as we remain listed on the HongKong Stock Exchange, to continue to put forth the resolution at each of the annual general meetings after the 2021 EGM, until the resolution is passed, even though there may not be any resolutions to be approved by the shareholders at such meetings.If we choose to follow other home country practice in the future, our shareholders may be afforded less protection than they otherwise would under Nasdaq corporate governance listing standards applicable to U.S. domestic issuers.

We may be classified as a passive foreign investment company, or PFIC, which could result in adverse U.S. federal income tax consequence to U.S. Holdersof our ADSs or ordinary shares.

A non-U.S. corporation, such as our own, will beconsidered 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) isattributable to assets that produce or are held for the production of passive income. The value of our assets is generally determined by reference to the market price of the ADSs and ordinary shares, which may fluctuate considerably. In addition,because there are uncertainties in the application of the relevant rules and because PFIC status is a fact-intensive determination made on an annual basis, no assurance may be given with respect to our PFIC status for the current or any futuretaxable year.

Based on the market price of our ADSs and ordinary shares, the value of our assets, and the composition of our assets andincome, we believe that we were not a PFIC for our taxable year ended December 31, 2020. However, given the lack of authority and the highly factual nature of the analyzes, no assurance can be given. We must make a separate determination eachyear as to whether we are a PFIC. As a result, our PFIC status may change. In particular, because the total value of our assets for purposes of the asset test will generally be calculated using the market price of the ADSs and ordinary shares, ourPFIC status will depend in large part on the market price of the ADSs and ordinary shares, which may fluctuate considerably. Accordingly, fluctuations in the market price of the ADSs and ordinary shares may result in our being a PFIC for any year.If we are a PFIC for any year during which you hold the ADSs or ordinary shares, we will generally continue to be treated as a PFIC for all succeeding years during which you hold such ADSs or ordinary shares. Our PFIC status for the current taxableyear ending December 31, 2021 will not be determinable until the close of the taxable year, there can be no assurance that we will not be a PFIC for the current taxable year (or any future taxable year).

If we were treated as a PFIC for any taxable year during which a U.S. Holder (defined below) held an ADS or an ordinary share, certain adverseU.S. federal income tax consequences could apply to the U.S. Holder. See “TAXATION—U.S. Federal Income Tax Considerations—PFIC.”

The different characteristics of the capital markets in Hong Kong and the U.S. may negatively affect the trading prices of our Class A ordinaryshares and/or ADSs.

Upon the listing on the Hong Kong Stock Exchange, we will be subject to Hong Kong and Nasdaq listing andregulatory requirements concurrently. The Hong Kong Stock Exchange and Nasdaq have different trading hours, trading characteristics (including trading volume and liquidity), trading and listing rules, and investor bases (including different levelsof retail and institutional participation). As a result of these differences, the trading prices of our Class A ordinary shares and our ADSs may not be the same, even allowing for currency

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differences. Fluctuations in the price of our ADSs due to circumstances peculiar to the U.S. capital markets could materially and adversely affect the price of our Class A ordinary shares,or vice versa. Certain events having significant negative impact specifically on the U.S. capital markets may result in a decline in the trading price of our Class A ordinary shares notwithstanding that such event may not impact the tradingprices of securities listed in Hong Kong generally or to the same extent, or vice versa. Because of the different characteristics of the U.S. and Hong Kong capital markets, the historical market prices of our ADSs may not be indicative of thetrading performance of our Class A ordinary shares after the Global Offering.

Exchange between our Class A ordinary shares and our ADSsmay adversely affect the liquidity and/or trading price of each other.

Our ADSs are currently traded on Nasdaq. Subject tocompliance with U.S. securities law and the terms of the deposit agreement, holders of our Class A ordinary shares may deposit Class A ordinary shares with the depositary in exchange for the issuance of our ADSs. Any holder of ADSs mayalso surrender ADSs and withdraw the underlying Class A ordinary shares represented by the ADSs pursuant to the terms of the deposit agreement for trading on the Hong Kong Stock Exchange. In the event that a substantial number of Class Aordinary shares are deposited with the depositary in exchange for ADSs or vice versa, the liquidity and trading price of our Class A ordinary shares on the Hong Kong Stock Exchange and our ADSs on Nasdaq may be adversely affected.

The time required for the exchange between Class A ordinary shares and ADSs might be longer than expected and investors might not be able to settleor effect any sale of their securities during this period, and the exchange of Class A ordinary shares into ADSs involves costs.

There is no direct trading or settlement between Nasdaq and the Hong Kong Stock Exchange on which our ADSs and our Class A ordinary sharesare respectively traded. In addition, the time differences between Hong Kong and New York and unforeseen market circumstances or other factors may delay the deposit of Class A ordinary shares in exchange of ADSs or the withdrawal ofClass A ordinary shares underlying the ADSs. Investors will be prevented from settling or effecting the sale of their securities during such periods of delay. In addition, there is no assurance that any exchange of Class A ordinary sharesinto ADSs (and vice versa) will be completed in accordance with the timelines investors may anticipate.

Furthermore, the depositary forthe ADSs is entitled to charge holders fees for various services including for the issuance of ADSs upon deposit of Class A ordinary shares, cancelation of ADSs, distributions of cash dividends or other cash distributions, distributions of ADSspursuant to share dividends or other free share distributions, distributions of securities other than ADSs and annual service fees. As a result, shareholders who exchange Class A ordinary shares into ADSs, and vice versa, may not achieve thelevel of economic return the shareholders may anticipate.

We are exposed to risks associated with the potentialspin-off of one or more of our businesses.

We are exposed to risks associated with anypotential spin-off of one or more of our businesses. We have applied for, and the Hong Kong Stock Exchange has granted, a waiver from strict compliance with the requirements in paragraph 3(b) of Practice Note15 to the Hong Kong Listing Rules such that we are able to spin-off a subsidiary entity and list it on the Hong Kong Stock Exchange within three years of the listing on the Hong Kong Stock Exchange. While wedo not have any specific plans with respect to the timing or details of any potential spin-off listing on the Hong Kong Stock Exchange as of the date of this prospectus supplement, we continue to explore theongoing financing requirements for our various businesses and may consider a spin-off listing on the Hong Kong Stock Exchange for one or more of those businesses within the three year period subsequent to thelisting on the Hong Kong Stock Exchange. The waiver granted by the Hong Kong Stock Exchange is conditional upon us confirming to the Hong Kong Stock Exchange in advance of any spin-off that it would not renderour company, excluding the businesses to be spun off, incapable of fulfilling either the

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eligibility or suitability requirements under Rules 19C.02 and 19C.05 of the Hong Kong Listing Rules based on the financial information of the entity or entities to be spun-off at the time of our company’s listing (calculated cumulatively if more than one entity is spun-off). We cannot assure you that anyspin-off will ultimately be consummated, whether within the three-year period after the listing on the Hong Kong Stock Exchange or otherwise, and any such spin-off willbe subject to market conditions at the time and approval by the Listing Committee of the Hong Kong Stock Exchange. In the event that we proceed with a spin-off, our company’s interest in the entity to be spun-off (and its corresponding contribution to the financial results of our company) will be reduced accordingly.

An active trading market for our Class A ordinary shares on the Hong Kong Stock Exchange might not develop or be sustained and trading prices ofour Class A ordinary shares might fluctuate significantly.

Following the completion of the Global Offering, we cannot assureyou that an active trading market for our Class A ordinary shares on the Hong Kong Stock Exchange will develop or be sustained. The trading price or liquidity for our ADSs on Nasdaq might not be indicative of those of our Class A ordinaryshares on the Hong Kong Stock Exchange following the completion of the Global Offering. If an active trading market of our Class A ordinary shares on the Hong Kong Stock Exchange does not develop or is not sustained after the Global Offering,the market price and liquidity of our Class A ordinary shares could be materially and adversely affected.

In 2014, the Hong Kong,Shanghai and Shenzhen Stock Exchanges collaborated to create an inter-exchange trading mechanism called Stock Connect that allows international and mainland Chinese investors to trade eligible equity securities listed in each other’s marketsthrough the trading and clearing facilities of their home exchange. Stock Connect currently covers over 2,000 equity securities trading in the Hong Kong, Shanghai and Shenzhen markets. Stock Connect allows mainland Chinese investors to tradedirectly in eligible equity securities listed on the Hong Kong Stock Exchange, known as Southbound Trading; without Stock Connect, mainland Chinese investors would not otherwise have a direct and established means of engaging in Southbound Trading.In October 2019, the Shanghai and Shenzhen Stock Exchanges separately announced their amended implementation rules in connection with Southbound Trading to include shares of companies with a dual-class structure to be traded through Stock Connect.However, since these rules are relatively new, there remains uncertainty as to the implementation details, especially with respect to shares of those companies with a secondary listing on the Hong Kong Stock Exchange. It is unclear whether and whenthe Class A ordinary shares of our company, a company with dual-class structure with a secondary listing in Hong Kong upon the Listing, will be eligible to be traded through Stock Connect, if at all. The ineligibility or any delay of ourClass A ordinary shares for trading through Stock Connect will affect mainland Chinese investors’ ability to trade our Class A ordinary shares and therefore may limit the liquidity of the trading of our Class A ordinary shares onthe Hong Kong Stock Exchange.

Since there will be a gap of several days between pricing and trading of our Class A ordinary shares, the priceof our ADSs traded on Nasdaq may fall during this period and could result in a fall in the price of our Class A ordinary shares to be traded on the Hong Kong Stock Exchange.

Our Class A ordinary shares will not commence trading on the Hong Kong Stock Exchange until they are delivered, which is expected to beabout four Hong Kong business days. As a result, investors may not be able to sell or otherwise deal in our Class A ordinary shares during that period. Accordingly, holders of our Class A ordinary shares are subject to the risk that thetrading price of our Class A ordinary shares could fall when trading commences as a result of adverse market conditions or other adverse developments that could occur between the Price Determination Date and the time trading begins. Inparticular, as our ADSs will continue to be traded on Nasdaq and their price can be volatile, any fall in the price of our ADSs may result in a fall in the price of our Class A ordinary shares to be traded on the Hong Kong Stock Exchange.

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There is uncertainty as to whether Hong Kong stamp duty will apply to the trading or conversion of ourADSs following our initial public offering in Hong Kong and listing of our Class A ordinary shares on the Hong Kong Stock Exchange.

In connection with our initial public offering of Class A ordinary shares in Hong Kong, we will establish a branch register of members inHong Kong, or the Hong Kong share register. Our Class A ordinary shares that are traded on the Hong Kong Stock Exchange, including those to be issued in this Hong Kong offering and those that may be converted from ADSs, will be registered onthe Hong Kong share register, and the trading of these Class A ordinary shares on the Hong Kong Stock Exchange will be subject to the Hong Kong stamp duty. To facilitate ADS-ordinary share conversion andtrading between Nasdaq and the Hong Kong Stock Exchange, we also intend to move a portion of our issued Class A ordinary shares from our register of members maintained in the Cayman Islands to our Hong Kong share register.

Under the Hong Kong Stamp Duty Ordinance, any person who effects any sale or purchase of Hong Kong stock, defined as stock the transfer ofwhich is required to be registered in Hong Kong, is required to pay Hong Kong stamp duty. The stamp duty is currently set at a total rate of 0.2% of the greater of the consideration for, or the value of, shares transferred, with 0.1% payable by eachof the buyer and the seller.

To the best of our knowledge, Hong Kong stamp duty has not been levied in practice on the trading orconversion of ADSs of companies that are listed in both the United States and Hong Kong and that have maintained all or a portion of their ordinary shares, including ordinary shares underlying ADSs, in their Hong Kong share registers. However, it isunclear whether, as a matter of Hong Kong law, the trading or conversion of ADSs of these dual-listed companies constitutes a sale or purchase of the underlying Hong Kong-registered ordinary shares that is subject to Hong Kong stamp duty. We adviseinvestors to consult their own tax advisors on this matter. If Hong Kong stamp duty is determined by the competent authority to apply to the trading or conversion of our ADSs, the trading price and the value of your investment in our Class Aordinary shares and/or ADSs may be affected.

Purchasers of our Class A ordinary shares in the Global Offering will experience immediatedilution and may experience further dilution if we issue additional Class A ordinary shares in the future.

The initial publicoffer price of our Class A ordinary shares in Hong Kong is higher than the net tangible assets per share of the outstanding Class A ordinary shares issued to our existing shareholders immediately prior to the Global Offering. Therefore,purchasers of our Class A ordinary shares in the Global Offering will experience an immediate dilution in terms of the pro forma net tangible asset value. In addition, we may consider offering and issuing additional Class A ordinary sharesor equity- related securities in the future to raise additional funds, finance acquisitions or for other purposes. Purchasers of our Class A ordinary shares may experience further dilution in terms of the net tangible asset value per share ifwe issue additional Class A ordinary shares in the future at a price that is lower than the net tangible asset value per share.

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CERTAIN FINANCIAL DATA

Set forth below are certain consolidated statements of operations data and cash flow data for the years ended December 31, 2018, 2019 and2020 and certain consolidated balance sheet data as of December 31, 2018, 2019 and 2020. The selected consolidated statements of operations data for the years ended December 31, 2018, 2019 and 2020, selected consolidated balance sheetsdata as of December 31, 2019 and 2020 and selected consolidated cash flow data for the years ended December 31, 2018, 2019 and 2020 have been derived from our audited consolidated financial statements that are included in our 2020 Form 20-F and are incorporated into the accompanying prospectus by reference. Our audited consolidated financial statements are prepared in accordance with U.S. GAAP.

The consolidated financial information should be read in conjunction with, and is qualified in its entirety by reference to, our auditedconsolidated financial statements for the three years ended December 31, 2020 and as of December 31, 2019 and 2020 and related notes, “Item 5. Operating and Financial Review and Prospects” in our 2020 Form 20-F, and our current report on Form 6-K furnished to the SEC on March 9, 2021. Our historical results do not necessarily indicate results expected for any future periods.

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Segment Reporting

As of December 31, 2018, 2019 and 2020, we had two reportable segments, Baidu Core and iQIYI. Baidu Core mainly provides search-based,feed-based, and other online marketing services, as well as products and services from our new AI initiatives. iQIYI is an online entertainment service provider that offers original, professionally produced and partner-generated content on itsplatform. In early April 2018, iQIYI completed its initial public offering on the Nasdaq Global Market.

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The following table sets forth our revenues by segment and the year-over-year change ratefor the periods indicated, with each segment revenues including inter-segment revenues:

Notes:

The following table sets forth our operating costs and expenses by segment and theyear-over-year change rate for the periods indicated, with each segment operating costs and expenses including inter-segment costs and expenses:

Impact of COVID-19 on Our Operations

Our results of operations have been, and could continue to be adversely, and may be materially, affected, to the extent that the COVID-19 or any other epidemic harms the Chinese and global economy in general. Any potential impact to our results will depend on, to a large extent, future developments and new information that may emergeregarding the duration and severity of the COVID-19 and the actions taken by government authorities and other entities to contain the COVID-19 or treat its impact,almost all of which are beyond our control.

The potential downturn brought by and the duration of theCOVID-19 pandemic may be difficult to assess or predict where actual effects will depend on many factors beyond our control. The extent to which the COVID-19 pandemicimpacts our long-term results remains uncertain, and we are closely monitoring its impact on us. During the year ended December 31, 2020, our operations have been significantly affected by the

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COVID-19 pandemic. Our online marketing revenues declined compared to the prior period mainly due to weakness in online marketing demand as our customersin certain industries are negatively impacted by COVID-19. We have also provided additional allowance for credit losses for accounts receivable and contract assets, recognized impairment charges on ourlong-term investments and content assets, and recorded loss from equity method investments in the year ended December 31, 2020, due to the impact of COVID-19 and other factors. In addition, increasedmarket volatility has contributed to larger fluctuations in the valuation of our equity investments. There are still significant uncertainties of COVID-19’s future impact, and the extent of the impactwill depend on a number of factors, including the duration and severity of COVID-19, possibility of new waves in China and other countries, the development and progress of distribution of COVID-19 vaccine and other medical treatment, the potential change in user behavior, especially on internet usage due to the prolonged impact of COVID-19, the actions taken bygovernment authorities, particularly to contain the outbreak, stimulate the economy to improve business condition especially for small and medium enterprises, almost all of which are beyond our control. As a result, certain of our estimates andassumptions, including the allowance for credit losses, the valuation of certain debt and equity investments, long-term investments, content assets and long-lived assets subject to impairment assessments, require significant judgments and carry ahigher degree of variabilities and volatilities that could result in material changes to our current estimates in future periods.

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USE OF PROCEEDS

We will determine the offer price for both the international offering and the Hong Kong public offering by reference to, among other factors,the closing price of our ADSs on the last trading day before the pricing of the global offering, which is expected to be on or about March 17, 2021. The maximum offer price for the Hong Kong public offering is HK$295.00, or US$38.05, perClass A ordinary share (equivalent to US$304.38 per ADS). Assuming (i) the offering price is HK$295.00 per Class A ordinary share, (ii) initially 90,250,000 Class A ordinary shares are allocated to the international offeringand (iii) initially 4,750,000 Class A ordinary shares are allocated to the Hong Kong public offering, we estimate that we will receive net proceeds from the Global Offering of approximately HK$27.6 billion, or US$3.6 billion (orapproximately HK$31.8 billion, or US$4.1 billion, if the Joint Representatives exercise in full, on behalf of the international underwriters, their option to purchase additional Class A ordinary shares), after deducting estimated underwritingdiscounts and commissions and the estimated offering expenses payable by us. On December 31, 2020, the exchange rate set forth in the H.10 statistical release of The Board of Governors of the Federal Reserve System for Hong Kong dollars wasHK$7.7534 to US$1.00. The above Hong Kong dollar amounts reflect translations from U.S. dollar amounts at this exchange rate.

The publicoffering price in the international offering may be higher than, or the same as, the public offering price in the Hong Kong public offering. In addition, the allocation of ordinary shares between the Hong Kong public offering and the internationaloffering is subject to reallocation as described in “Underwriting.”

We plan to use the net proceeds we will receive from theGlobal Offering for the following purposes:

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To the extent that the net proceeds of the Global Offering are not immediately required for the above purposes or if we are unable to put intoeffect any part of our plan as intended, we may hold such unused net proceeds in cash or short term deposits at authorized financial institutions and/or licensed banks.

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CAPITALIZATION

The following table sets forth our capitalization as of December 31, 2020:

This table should be read in conjunction with, and is qualified in its entirety by reference to, our audited consolidated financial statementsand the notes thereto in our 2020 Form 20-F, which is incorporated by reference into the accompanying prospectus.

Note:

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DILUTION

If you invest in our Class A ordinary shares in the Global Offering, your interest will be diluted to the extent of the differencebetween the public offering price per Class A ordinary share and our as adjusted net tangible assets attributable to our ordinary shareholders per ordinary share after the Global Offering. Dilution results from the fact that the public offeringprice per Class A ordinary share is substantially in excess of the net tangible assets attributable to our ordinary shareholders per ordinary share attributable to the existing shareholders for our presently outstanding ordinary shares.

Our net tangible assets attributable to our ordinary shareholders as of December 31, 2020 was RMB158,426 million (US$24,279million), or RMB59.13 (US$9.06) per ordinary share as of that date, and RMB473.07 (US$72.50) per ADS, after having accounted for the Share Subdivision (as defined below). Net tangible assets attributable to our ordinary shareholders represents theamount of our total Baidu, Inc. shareholders’ equity, less the amount of our intangible assets and goodwill. For the avoidance of doubt, “Licensed copyright, net” and “Produced content, net” were not deducted for the purposeof calculating the net tangible assets attributable to our ordinary shareholders. Dilution is determined by subtracting as adjusted net tangible assets attributable to our ordinary shareholders per ordinary share, after giving effect to the issuanceand sale by us of Class A ordinary shares in the Global Offering at an assumed offer price of HK$295, or US$38.05, per Class A ordinary share, after deducting the estimated underwriting discounts and commissions and estimated offeringexpenses payable by us from the public offering price per Class A ordinary share, and assuming the international underwriters do not exercise their option to purchase additional Class A ordinary shares.

Without taking into account any other changes in net tangible assets attributable to our ordinary shareholders after December 31, 2020,other than to give effect to the issuance and sale by us of Class A ordinary shares in the Global Offering at an assumed offer price of HK$295, or US$38.05, per Class A ordinary share, assuming no adjustment to the allocation ofClass A ordinary shares between the Hong Kong public offering and the international offering and after deducting estimated underwriting discounts and commissions and estimated offering expenses payable by us, and assuming the internationalunderwriters do not exercise their option to purchase additional Class A ordinary shares, our as adjusted net tangible assets attributable to our ordinary shareholders as of December 31, 2020 would have been US$10.04 per outstandingClass A ordinary share and US$80.30 per ADS, after having accounted for the Share Subdivision (as defined below). This represents an immediate increase in net tangible assets attributable to our ordinary shareholders of US$0.98 per ordinaryshare and US$7.80 per ADS to the existing shareholders and an immediate dilution in net tangible assets attributable to our ordinary shareholders of US$28.01 per ordinary share and US$224.08 per ADS to investors purchasing Class A ordinaryshares in the Global Offering.

The following table illustrates such dilution:

Note:

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The amount of dilution in net tangible assets attributable to our ordinary shareholders to new investors in the Global Offering set forthabove is determined after giving effect to the Global Offering from the public offering price per Class A ordinary share.

A US$1.00increase/(decrease) in the assumed offer price of HK$295, or US$38.05, per Class A ordinary share would increase/(decrease) our as adjusted net tangible assets attributable to our ordinary shareholders after giving effect to the Global Offeringby US$94 million, the as adjusted net tangible assets attributable to our ordinary shareholders per ordinary share and per ADS after giving effect to the Global Offering by US$0.03 per Class A ordinary share and US$0.27 per ADS and the dilutionin net tangible assets attributable to our ordinary shareholders per ordinary share and per ADS to new investors in the Global Offering by US$0.97 per Class A ordinary share and US$7.73 per ADS, assuming no change to the number of Class Aordinary shares offered by us as set forth on the front cover page of this prospectus supplement, assuming no adjustment to the allocation of Class A ordinary shares between the Hong Kong public offering and the international offering and afterdeducting estimated underwriting discounts and commissions.

If the Joint Representatives were to exercise in full, on behalf of theinternational underwriters, their option to purchase an additional 14,250,000 Class A ordinary shares from us, the percentage of our ordinary shares held by existing shareholders would be 96.1%, and the percentage of our ordinary shares held bynew investors would be 3.9%.

The discussion and tables above do not reflect (i) any outstanding share options or granted but not yetvested restricted share units, (ii) any issuance of our ordinary shares and/or ADSs from December 31, 2020 to the date of this prospectus supplement, and (iii) any ordinary shares and/or ADSs repurchased by us under the sharerepurchase program from December 31, 2020 to the date of this prospectus supplement. As of December 31, 2020, the awards that had been granted to our directors, officers, employees and consultants and remained outstanding included(i) restricted share units to receive an aggregate of 130,501,520 ordinary shares, excluding restricted share units that were forfeited, cancelled, or vested after the relevant grant date, and (ii) options to purchase an aggregate of24,219,040 ordinary shares, excluding options that were forfeited, cancelled, or exercised after the relevant grant date.

Translations ofU.S. dollars into Hong Kong dollars and from Hong Kong dollars into RMB relating to estimated net proceeds and the assumed offering price were made at HK$7.7534 to US$1.00 and RMB0.8416 to HK$1.00, the respective exchange rate on December 31,2020 as set forth in the H.10 statistical release of The Board of Governors of the Federal Reserve System. Unless otherwise stated, all translations of RMB into U.S. dollars in this “Dilution” section were made at RMB6.5250 to US$1.00, theexchange rate on December 31, 2020 as set forth in the H.10 statistical release of The Board of Governors of the Federal Reserve System.

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PRINCIPAL SHAREHOLDERS

The following table sets forth information with respect to the beneficial ownership of our ordinary shares as of March 3, 2021 by:

The calculations in the table below are based on 2,685,023,744 ordinary shares, consisting of 2,125,123,424 Class A ordinary shares and559,900,320 Class B ordinary shares issued and outstanding as of March 3, 2021. On March 1, 2021, we effected a change to our authorized share capital by1-to-80 subdivision of shares. Concurrently, we effected a proportionate change in ADS to Class A ordinary share ratio from 10 ADSs representing 1 Class Aordinary share to each ADS representing 8 Class A ordinary shares. Such changes been reflected retroactively throughout this document.

Beneficial ownership is determined in accordance with the rules and regulations of the SEC. In computing the number of shares beneficiallyowned by a person and the percentage ownership and voting power percentage of that person, we have included shares and associated votes that the person has the right to acquire within 60 days, including through the exercise of any option, warrant orother right or the conversion of any other security. These shares and associated votes, however, are not included in the computation of the percentage ownership of any other person. Ordinary shares held by a shareholder are determined in accordancewith our register of members.

Notes:

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As of March 3, 2021, to our knowledge, approximately 78.4% of our total outstanding ordinary shares were held by three recordshareholders in the United States, including approximately 78.3% held by The Bank of New York Mellon, the depositary of our ADS program. The number of beneficial owners of ADSs in the United States is likely to be much larger than the number ofrecord holders of our ordinary shares in the United States.

We are not aware of any arrangement that may, at a subsequent date, result ina change of control of our company.

Merrill Lynch (Asia Pacific) Limited, through its affiliate Merrill Lynch International, expects toenter into a borrowing arrangement with Baidu Holdings Limited to facilitate the settlement of over-allocations. Merrill Lynch International is obligated to return Class A ordinary shares to Baidu Holdings Limited by exercising the option topurchase additional Class A ordinary shares from us or by making purchases in the open market.

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DIVIDEND POLICY

Our board of directors has complete discretion on whether to distribute dividends subject to our memorandum and articles of association andcertain restrictions under Cayman Islands law. In addition, our shareholders may by ordinary resolution declare dividends, but no dividend may exceed the amount recommended by our directors. Under Cayman Islands law, a Cayman Islands company may paya dividend out of either profit or share premium account, provided that in no circumstances may a dividend be paid if this would result in the company being unable to pay its debts as they fall due in the ordinary course of business. Even if ourboard of directors decides to pay dividends, the form, frequency and amount will depend upon our future operations and earnings, capital requirements and surplus, general financial condition, contractual restrictions and other factors that the boardof directors may deem relevant.

We have not declared or paid any dividends on our ordinary shares, nor do we have any present plan to payany cash dividends on our ordinary shares in the foreseeable future. We currently intend to retain most, if not all, of our available funds and any future earnings to operate and expand our business.

We are a holding company registered by way of continuation under the laws of the Cayman Islands. We may rely on dividends from oursubsidiaries in China for our cash requirements, including any payment of dividends to our shareholders. PRC regulations may restrict the ability of our PRC subsidiaries to pay dividends to us.

If we pay any dividends on our ordinary shares, we will pay those dividends which are payable in respect of the ordinary shares underlying ourADSs to the depositary, as the registered holder of such ordinary shares, and the depositary will then pay such amounts to our ADS holders in proportion to the ordinary shares underlying the ADSs held by such ADS holders, subject to the terms of thedeposit agreement, including the fees and expenses payable thereunder. Cash dividends on our ordinary shares, if any, will be paid in U.S. dollars.

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SHARES ELIGIBLE FOR FUTURE SALE

Upon the closing of the Global Offering, we will have 2,220,123,424 Class A ordinary shares (or 2,234,373,424 Class A ordinaryshares if the Joint Representatives exercise in full, on behalf of the international underwriters, their option to purchase additional Class A ordinary shares), excluding 48,817,605 Class A ordinary shares issued to our depositary bank forbulk issuance of ADSs reserved for future issuances upon the exercise or vesting of awards granted under our share incentive plans.

Allof the Class A ordinary shares sold in the Global Offering will be freely transferable without restriction or further registration under the Securities Act. Sales of substantial amounts of our Class A ordinary shares in the public marketcould materially and adversely affect prevailing market prices of our ADSs and Class A ordinary shares.

Lock-Up Agreements

In connection with the Global Offering, we, Mr. Robin Yanhong Li and his spouse and our directors and officers have agreed, for a period of 90days after the date on which the Hong Kong public offering commences, not to offer, pledge, issue, sell, contract to sell, sell any option or contract to option, right or warrant to purchase, or otherwise transfer or dispose of, directly orindirectly, any of our ordinary shares, in the form of ADSs or otherwise, or any securities convertible into or exchangeable or exercisable for our ordinary shares, in the form of ADSs or otherwise, without the prior written consent of Merrill Lynch(Asia Pacific) Limited, CLSA Limited and Goldman Sachs (Asia) L.L.C. The foregoing lock-up restrictions are subject to certain exceptions for each party. See“Underwriting—Lock-Up Agreements.”

Rule 144

“Restricted securities” as that term is defined in Rule 144 under the Securities Act and may be sold publicly in the United Statesonly if they are subject to an effective registration statement under the Securities Act or pursuant to an exemption from the registration requirement such as those provided by Rule 144 and Rule 701 promulgated under the Securities Act.

In general, under Rule 144 as currently in effect, beginning 90 days after we became a reporting company, a person (or persons whose sharesare aggregated) who at the time of a sale is not, and has not been during the three months preceding the sale, an affiliate of ours and has beneficially owned our restricted securities for at least six months will be entitled to sell the restrictedsecurities without registration under the Securities Act, subject only to the availability of current public information about us, and will be entitled to sell restricted securities beneficially owned for at least one year without restriction.Persons who are our affiliates and have beneficially owned our restricted securities for at least six months may sell a number of restricted securities within any three-month period that does not exceed the greater of the following:

Sales by ouraffiliates under Rule 144 are also subject to certain requirements relating to manner of sale, notice and the availability of current public information about us.

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Rule 701

In general, under Rule 701 of the Securities Act as currently in effect, each of our employees, consultants or advisors who purchases ourordinary shares from us in connection with a compensatory stock plan or other written agreement executed prior to the completion of this offering is eligible to resell those ordinary shares 90 days after we became a reporting company in reliance onRule 144, but without compliance with some of the restrictions, including the holding period, contained in Rule 144. However, the Rule 701 shares would remain subject to lock-up arrangements and would onlybecome eligible for sale when the lock-up period expires.

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EXCHANGES BETWEEN ADSs AND CLASS A ORDINARY SHARES

Dealings and Settlement of Class A Ordinary Shares in Hong Kong

Our Class A ordinary shares will trade on the Hong Kong Stock Exchange in board lots of 50 Class A ordinary shares. Dealings in ourClass A ordinary shares on the Hong Kong Stock Exchange will be conducted in Hong Kong dollars.

The transaction costs of dealings inour Class A ordinary shares on the Hong Kong Stock Exchange include:

Investors must settle their trades executed on the Hong Kong Stock Exchangethrough their brokers directly or through custodians. For an investor who has deposited his or her Class A ordinary shares in his or her stock account or in his or her designated Central Clearing and Settlement System participant’s stockaccount maintained with the Central Clearing and Settlement System, or CCASS, settlement will be effected in CCASS in accordance with the General Rules of CCASS and CCASS Operational Procedures in effect from time to time. For an investor who holdsthe physical certificates, settlement certificates and the duly executed transfer forms must be delivered to his or her broker or custodian before the settlement date.

Exchanges between Class A Ordinary Shares Trading in Hong Kong and ADSs

In connection with initial public offering of Class A ordinary shares in Hong Kong, or the Hong Kong IPO, we have established a branchregister of members in Hong Kong, or the Hong Kong share register, which will be maintained by our Hong Kong share registrar, Computershare Hong Kong Investor Services Limited. Our principal register of members, or the Cayman share register, willcontinue to be maintained by our principal share registrar, Maples Fund Services (Cayman) Limited, or Maples.

All Class A ordinaryshares offered in the Hong Kong IPO will be registered on the Hong Kong share register in order to be listed and traded on the Hong Kong Stock Exchange. As described in further detail below, holders of Class A ordinary shares registered on theHong Kong share register will be able to deposit these ordinary shares into ADSs, and vice versa.

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Our ADSs

Our ADSs are traded on Nasdaq. Dealings in our ADSs on Nasdaq are conducted in U.S. Dollars.

ADSs may be held either:

The depositary for our ADSs is TheBank of New York Mellon, whose office is located at 240 Greenwich Street, New York, New York 10286, United States.

Depositing Class A OrdinaryShares Trading in Hong Kong for delivery of ADSs

An investor who holds Class A ordinary shares registered in Hong Kong andwho intends to convert them to ADSs to trade on Nasdaq must deposit or have his or her broker deposit the Class A ordinary shares with the depositary’s Hong Kong custodian, The Hong Kong and Shanghai Banking Corporation Limited, Hong Kong,or the custodian, in exchange for ADSs.

A deposit of Class A ordinary shares trading in Hong Kong in exchange for ADSs involves thefollowing procedures:

For Class A ordinary shares deposited in CCASS, under normal circumstances, the above steps generally require two business days, providedthat the investor has provided timely and complete instructions. For Class A ordinary shares held outside CCASS in physical form, the above steps may take 14 business days, or more, to complete. Temporary delays may arise. For example, thetransfer books of the depositary may from time to time be closed to ADS issuances. The investor will be unable to trade the ADSs until the procedures are completed.

Surrender of ADSs for Delivery of Class A Ordinary Shares Trading in Hong Kong

An investor who holds ADSs and wishes to receive Class A ordinary shares that trade on the Hong Kong Stock Exchange must cancel the ADSsthe investor holds and withdraw Class A ordinary shares from our ADS program and cause his or her broker or other financial institution to trade such Class A ordinary shares on the Hong Kong Stock Exchange.

An investor that holds ADSs indirectly through a broker or other financial institution should follow the procedure of the broker or financialinstitution and instruct the broker to arrange for cancelation of the ADSs, and transfer of the underlying Class A ordinary shares from the depositary’s account with the custodian within the CCASS system to the investor’s Hong Kongstock account.

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For investors holding ADSs directly, the following steps must be taken:

For Class A ordinary shares to be received in CCASS, under normalcircumstances, the above steps generally require two business days, provided that the investor has provided timely and complete instructions. For Class A ordinary shares to be received outside CCASS in physical form, the above steps may take 14business days, or more, to complete. The investor will be unable to trade the Class A ordinary shares on the Hong Kong Stock Exchange until the procedures are completed.

Temporary delays may arise. For example, the transfer books of the depositary may from time to time be closed to ADS cancellations. Inaddition, completion of the above steps and procedures for delivery for Class A ordinary shares in a CCASS account is subject to there being a sufficient number of Class A ordinary shares on the Hong Kong share register to facilitate awithdrawal from the ADS program directly into the CCASS system. We are not under any obligation to maintain or increase the number of Class A ordinary shares on the Hong Kong share register to facilitate such withdrawals.

Depositary Requirements

Beforethe depositary delivers ADSs or permits withdrawal of Class A ordinary shares, the depositary may require:

The depositary may refuse to deliver, transfer, or registerissuances, transfers and cancelations of ADSs generally when the transfer books of the depositary or our Hong Kong share registrar are closed or at any time if the depositary or we determine it advisable to do so.

All costs attributable to the transfer of ordinary shares to effect a withdrawal from or deposit of Class A ordinary shares into our ADSprogram will be borne by the investor requesting the transfer or deposit. In particular, holders of ordinary shares and ADSs should note that the Hong Kong share registrar will charge between HK$2.50 to HK$20, depending on the speed of service (orsuch higher fee as may from time to time be permitted under the Hong Kong Listing Rules), for each transfer of Class A ordinary shares from one registered owner to another, each share certificate canceled or issued by it and any applicable feeas stated in the share transfer forms used in Hong Kong. In addition, holders of ordinary shares and ADSs must pay up to US$5.00 per 100 ADSs (or portion thereof) for each issuance of ADSs and each cancelation of ADSs, as the case may be, inconnection with the deposit of Class A ordinary shares into, or withdrawal of ordinary shares from, the ADS facility.

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UNDERWRITING

The Global Offering

The offering of our95,000,000 Class A ordinary shares is referred to herein as the “Global Offering.” The Global Offering comprises:

The internationaloffering contemplated herein consists of a U.S. offering and a non-U.S. offering made outside the U.S. in compliance with applicable law. We are paying a registration fee for Class A ordinary shares soldin the United States, as well as for Class A ordinary shares initially offered and sold outside the United States in the Global Offering that may be resold from time to time into the United States in compliance with applicable law.

Merrill Lynch (Asia Pacific) Limited, CLSA Limited and Goldman Sachs (Asia) L.L.C. are acting as joint representatives, or the JointRepresentatives, for the Global Offering.

Under the terms and subject to the conditions in the Hong Kong underwriting agreement (asdefined below), the Hong Kong underwriters below, or the Hong Kong underwriters, have severally agreed to apply or procure applications for the number of Class A ordinary shares indicated below.

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We and the international underwriters have entered into an international underwritingagreement, dated the date hereof, have severally agreed to purchase or procure purchasers to purchase from us, and we have agreed to sell to them or such purchasers, severally, the number of Class A ordinary shares indicated below:

The Hong Kong underwriters and the international underwriters are collectively referred to herein as theunderwriters.

Upon the closing of the Global Offering, we will have 2,220,123,424 Class A ordinary shares (or 2,234,373,424Class A ordinary shares if the Joint Representatives exercise in full, on behalf of the international underwriters, their option to purchase additional Class A ordinary shares), excluding 48,817,605 Class A ordinary shares issued toour depositary bank for bulk issuance of ADSs reserved for future issuances upon the exercise or vesting of awards granted under our share incentive plans.

The underwriters propose to offer our Class A ordinary shares at the public offering price listed on the cover page of this prospectussupplement. The underwriters are obligated, severally but not jointly, to take and pay for all of the Class A ordinary shares offered hereby if any such shares are taken. The offering of our Class A ordinary shares by the underwriters issubject to receipt and acceptance and subject to the underwriters’ right to reject any order in whole or in part.

We have applied tolist our Class A ordinary shares on the Hong Kong Stock Exchange under the stock code “9888.” The shares will be traded in board lots of 50 shares each. Our ADSs are listed on the Nasdaq Global Select Market under the symbol“BIDU.” Each ADS represents eight Class A ordinary shares.

A prospectus supplement in electronic format may be madeavailable on websites maintained by one or more underwriters, or selling group members, if any, participating in the Global Offering. The Joint Representatives may agree to allocate a number of our Class A ordinary shares to the underwritersfor sale to their online brokerage account holders. Internet distributions will be allocated by the Joint Representatives to underwriters that may make internet distributions on the same basis as other allocations.

The Hong Kong Public Offering

Number ofClass A ordinary shares initially offered

We are initially offering 4,750,000 Class A ordinary shares for subscriptionby the public in Hong Kong at the public offering price, representing 5% of the total number of Offer Shares initially available under the Global Offering. The number of Offer Shares initially offered under the Hong Kong public offering, subject toany

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reallocation of Offer Shares between the international offering and the Hong Kong public offering, will represent approximately 0.17% of the total Class A ordinary shares and Class Bordinary shares in issue immediately following the completion of the Global Offering (assuming the over-allotment option is not exercised and without taking into account the Class A ordinary shares to be issued pursuant to our share incentiveplan, including pursuant to the exercise of the options or the vesting of restricted share units or other awards that have been or may be granted from time to time).

The Hong Kong public offering is open to members of the public in Hong Kong as well as to institutional and professional investors.Professional investors generally include brokers, dealers, companies (including fund managers) whose ordinary business involves dealing in shares and other securities and corporate entities that regularly invest in shares and other securities.

Completion of the Hong Kong public offering is subject to the conditions set out in “— Conditions of the Global Offering”below.

Allocation

Allocationof Offer Shares to investors under the Hong Kong public offering will be based solely on the level of valid applications received under the Hong Kong public offering.

The basis of allocation may vary, depending on the number of Hong Kong offer shares validly applied for by applicants. Such allocation could,where appropriate, consist of balloting, which could mean that some applicants may receive a higher allocation than others who have applied for the same number of Hong Kong offer shares, and those applicants who are not successful in the ballot maynot receive any Hong Kong offer shares.

For allocation purposes only, the total number of Hong Kong offer shares available under the HongKong public offering (after taking into account any reallocation referred to below) will be divided equally (to the nearest board lot) into two pools: pool A and pool B. The Hong Kong offer shares in pool A will be allocated on an equitable basis toapplicants who have applied for Hong Kong offer shares with an aggregate price of HK$5 million (excluding the brokerage, the SFC transaction levy and the Hong Kong Stock Exchange trading fee payable) or less. The Hong Kong offer shares in poolB will be allocated on an equitable basis to applicants who have applied for Hong Kong offer shares with an aggregate price of more than HK$5 million (excluding the brokerage, the SFC transaction levy and the Hong Kong Stock Exchange tradingfee payable) and up to the total value in pool B.

Investors should be aware that applications in pool A and applications in pool B mayreceive different allocation ratios. If any Hong Kong offer shares in one (but not both) of the pools are unsubscribed, such unsubscribed Hong Kong offer shares will be transferred to the other pool to satisfy demand in that other pool and beallocated accordingly. For the purpose of the immediately preceding paragraph only, the “price” for Hong Kong offer shares means the price payable on application therefor (without regard to the Hong Kong public offer price as finallydetermined). Applicants can only receive an allocation of Hong Kong offer shares from either pool A or pool B and not from both pools. Multiple or suspected multiple applications under the Hong Kong public offering and any application for more than2,375,000 Hong Kong offer shares are liable to be rejected.

Reallocation

The allocation of the Offer Shares between the Hong Kong public offering and the international offering is subject to reallocation. Paragraph4.2 of Practice Note 18 of the Hong Kong Listing Rules requires a clawback mechanism to be put in place which would have the effect of increasing the number of Offer Shares under the Hong Kong public offering to a certain percentage of the totalnumber of Offer Shares offered under the Global Offering if certain prescribed total demand levels are reached. We have applied for, and the Hong Kong Stock Exchange has granted us, a waiver from strict compliance with Paragraph 4.2 of Practice Note18 of the Hong Kong Listing Rules to the effect as further described below.

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4,750,000 Offer Shares are initially available in the Hong Kong public offering,representing 5% of the Offer Shares initially available under the Global Offering.

If the number of Offer Shares validly applied forunder the Hong Kong public offering represents (a) 15 times or more but less than 50 times, (b) 50 times or more but less than 100 times and (c) 100 times or more of the total number of Offer Shares initially available under the Hong Kong publicoffering, then Offer Shares will be reallocated to the Hong Kong public offering from the international offering. As a result of such reallocation, the total number of Offer Shares available under the Hong Kong public offering will be increased to8,550,000 Offer Shares (in the case of (a)), 9,500,000 Offer Shares (in the case of (b)) and 11,400,000 Offer Shares (in the case of (c)), representing 9%, 10% and 12% of the total number of Offer Shares initially available under the GlobalOffering, respectively (before any exercise of the over-allotment option). In each case, the additional Offer Shares reallocated to the Hong Kong public offering will be allocated between pool A and pool B and the number of Offer Shares allocated tothe international offering will be correspondingly reduced in such manner as the Joint Representatives deem appropriate.

In addition, theJoint Representatives may reallocate Offer Shares from the international offer shares to the Hong Kong public offering to satisfy valid applications under the Hong Kong public offering. In accordance with the Guidance Letter HKEX-GL91-18 issued by the Hong Kong Stock Exchange, if such reallocation is done other than pursuant to the clawback mechanism above, the maximum total number of Offer Shares that may be reallocated to the HongKong public offering following such reallocation shall be not more than double the initial allocation to the Hong Kong public offering (i.e., 9,500,000 Class A ordinary shares, representing 10% of the total number of Offer Shares initiallyavailable under the Global Offering).

If the Hong Kong public offering is not fully subscribed, the Joint Representatives may reallocateall or any unsubscribed Hong Kong offer shares to the international offering, in such proportions as the Joint Representatives deem appropriate.

Details of any reallocation of Offer Shares between the Hong Kong public offering and the international offering will be disclosed in theresults announcement of the Hong Kong public offering, which is expected to be published on Monday, March 22, 2021.

Applications

Each applicant under the Hong Kong public offering will be required to give an undertaking and confirmation in the application submitted byhim/her that he/she and any person(s) for whose benefit he/she is making the application has not applied for or taken up, or indicated an interest for, and will not apply for or take up, or indicate an interest for, any international offer sharesunder the international offering. Such applicant’s application is liable to be rejected if such undertaking and/or confirmation is/are breached and/or untrue (as the case may be) or if he/she has been or will be placed or allocatedinternational offer shares under the international offering.

Applicants under the Hong Kong public offering are required to pay, onapplication, the maximum Hong Kong public offer price of HK$295.00 per Offer Share in addition to the brokerage, the SFC transaction levy and the Hong Kong Stock Exchange trading fee payable on each Offer Share, amounting to a total of HK$14,898.64for one board lot of 50 Class A ordinary shares. If the Hong Kong public offer price, as finally determined in the manner described in “—Pricing” below, is less than the maximum Hong Kong public offer price of HK$295.00 per OfferShare, appropriate refund payments (including the brokerage, the SFC transaction levy and the Hong Kong Stock Exchange trading fee attributable to the surplus application monies) will be made to successful applicants, without interest.

Hong Kong Underwriting Agreement

We and the Hong Kong underwriters have entered into an underwriting agreement dated March 11, 2021, or the Hong Kong underwriting agreement,relating to the Hong Kong public offering.

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The International Offering

The international offering will consist of an initial offering of 90,250,000 Offer Shares offered by us (subject to adjustment and the optionof the international underwriters to purchase additional Class A ordinary shares), representing 95% of the total number of Offer Shares initially available under the Global Offering. The number of Offer Shares initially offered under theinternational offering, subject to any reallocation of Offer Shares between the international offering and the Hong Kong public offering, will represent approximately 3.25% of the total Class A ordinary shares and Class B ordinary sharesin issue immediately following the completion of the Global Offering (assuming the over-allotment option is not exercised and without taking into account the Class A ordinary shares to be issued pursuant to our share incentive plan, includingpursuant to the exercise of options or the vesting of restricted share units or other awards that have been or may be granted from time to time).

Allocation

The internationaloffering will include marketing of Offer Shares in the United States as well as to institutional and professional investors and other investors anticipated to have a sizeable demand for such Offer Shares in Hong Kong and other jurisdictions outsidethe United States. Professional investors generally include brokers, dealers, companies (including fund managers) whose ordinary business involves dealing in shares and other securities and corporate entities that regularly invest in shares andother securities. Allocation of Offer Shares pursuant to the international offering will be effected in accordance with the “book-building” process described in “—Pricing” below and based on a number of factors, includingthe level and timing of demand, the total size of the relevant investor’s invested assets or equity assets in the relevant sector and whether or not it is expected that the relevant investor is likely to buy further Class A ordinary sharesand/or hold or sell its Class A ordinary shares after the Offer Shares are listed on the Hong Kong Stock Exchange. Such allocation is intended to result in a distribution of the Class A ordinary shares on a basis which would lead to theestablishment of a solid professional and institutional shareholder base to our benefit and the benefit of the shareholders as a whole.

The Joint Representatives (for themselves and on behalf of the underwriters) may require any investor who has been offered Offer Shares underthe international offering and who has made an application under the Hong Kong public offering to provide sufficient information to the Joint Representatives so as to allow them to identify the relevant applications under the Hong Kong publicoffering and to ensure that they are excluded from any allocation of Offer Shares under the Hong Kong public offering.

Reallocation

The total number of Offer Shares to be issued pursuant to the international offering may change as a result of the clawback arrangementdescribed in “—The Hong Kong Public Offering—Reallocation” above, the exercise of the option of the international underwriters to purchase additional Class A ordinary shares in whole or in part and/or any reallocation ofunsubscribed Offer Shares originally included in the Hong Kong public offering.

International Underwriting Agreement

We expect to enter into an international underwriting agreement with the Joint Representatives, as representatives of the internationalunderwriters, relating to the international offering dated the date of the price determination date.

Pricing

Determining the Offer Price

Pricing for the Offer Shares for the purpose of the various offerings under the Global Offering on the price determination date, which isexpected to be on or about Wednesday, March 17, 2021 and, in any event, no later than Monday, March 22, 2021, by agreement with the Joint Representatives (for themselves and on behalf of the underwriters), and the number of Offer Shares tobe allocated under the various offerings will be determined shortly thereafter.

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We will determine the Hong Kong public offer price by reference to, among other factors, theclosing price of the ADSs on Nasdaq on the last trading day on or before the price determination date, and the Hong Kong public offer price will not be more than HK$295.00 per Hong Kong offer shares. The historical prices of our ADSs and tradingvolume on Nasdaq are set out below.

Notes:

Applicants under the Hong Kong public offering must pay, on application, the maximum Hong Kong public offerprice, of HK$295.00 per Hong Kong offer share plus brokerage of 1.0%, SFC transaction levy of 0.0027% and Hong Kong Stock Exchange trading fee of 0.005%, amounting to a total of HK$14,898.64 for one board lot of 50 Class A ordinary shares.

We may set the international offer price at a level higher than the maximum Hong Kong public offer price if (a) the Hong Kong dollarequivalent of the closing trading price of the ADSs on Nasdaq on the last trading day on or before the price determination date (on a per-Class A ordinary share converted basis) were to exceed the maximum HongKong public offer price as stated in this prospectus supplement and/or (b) we believe that it is in the best interest of us as a listed company to set the international offer price at a level higher than the maximum Hong Kong public offer pricebased on the level of interest expressed by professional and institutional investors during the book-building process.

If theinternational offer price is set at or lower than the maximum Hong Kong public offer price, the Hong Kong public offer price must be set at such price which is equal to the international offer price. In no circumstances will we set the Hong Kongpublic offer price above the maximum Hong Kong public offer price as stated in this prospectus supplement or the international offer price.

We reserve the right not to proceed with the Hong Kong public offering or the international offering on or at any time until the pricedetermination date if, for any reason, including as a result of volatility in the price of our ADSs or other changes in market conditions, we do not agree with the Joint Representatives (for themselves and on behalf of the underwriters) on thepricing of the Offer Shares by March 22, 2021.

Sales in the United States

Some of the international underwriters are expected to make offers and sales both inside and outside the United States through their respectiveselling agents. Any offers or sales in the United States will be conducted by broker-dealers registered with the SEC. Merrill Lynch (Asia Pacific) Limited will offer our Class A ordinary shares in the United States through its SEC-registeredbroker-dealer affiliate in the United States, BofA Securities, Inc. Goldman Sachs (Asia) L.L.C. will offer our Class A ordinary shares in the United States through its SEC-registered broker-dealer affiliate in the United States, Goldman Sachs &Co. LLC. China International Capital Corporation Hong Kong Securities Limited is not a broker-dealer registered with the SEC, and, to the extent that its conduct may be deemed to involve participation in offers or sales of Class A ordinary shares inthe United States, those offers or sales will be made through one or more SEC-registered broker-dealers in compliance with applicable laws and regulations. China Renaissance Securities (Hong Kong) Limited will offer our Class A ordinary shares inthe United States through its SEC-registered broker-dealer affiliate in the United States, China Renaissance Securities (US) Inc. Nomura International (Hong Kong) Limited will offer our Class A ordinary shares in the United States through itsSEC-registered broker-dealer affiliate in the United States, Nomura Securities International, Inc. Citigroup Global Markets Limited will offer our Class A ordinary shares in the United States through its SEC-registered broker-dealer affiliate in theUnited States, Citigroup Global

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Markets Inc. Certain of the other international underwriters are not broker-dealers registered with the SEC, and do not intend to and will not offer or sell any of our Class A ordinaryshares in the United States.

Compensation and Expenses

The following table shows the per ordinary share and total underwriting discounts and commissions to be paid to the underwriters by us. Theseamounts include gross proceeds of the Global Offering that may be paid to the underwriters and are shown assuming both no exercise and full exercise of the international underwriters’ option to purchase up to an additional 14,250,000Class A ordinary shares. Total underwriting discounts and commissions to be paid to the underwriters represent    % of the total gross proceeds of the Global Offering (assuming the option to purchase additional Class Aordinary shares is not exercised). This presentation assumes the public offering price in both the international offering and the Hong Kong public offering is HK$        .

The estimated offering expenses payable by us, including registration, filing and listing fees, printing feesand legal and accounting expenses, but exclusive of the underwriting discounts and commissions, are approximately HK$105 million (US$14 million).

International Underwriters’ Option to Purchase Additional Class A ordinary shares

In connection with the Global Offering, we have granted the international underwriters the right, exercisable by the Joint Representatives (onbehalf of the international underwriters) at any time until 30 days after the last day for lodging applications under the Hong Kong public offering, to purchase up to an aggregate of 14,250,000 additional Class A ordinary shares, representingnot more than 15% of the total number of Class A ordinary shares initially available under the Global Offering, at the international offering price to, among other things, cover over-allocations in the international offering, if any.

Merrill Lynch (Asia Pacific) Limited, through its affiliate Merrill Lynch International, expects to enter into a borrowing arrangement withBaidu Holdings Limited that is intended to facilitate the settlement of over-allotment. Merrill Lynch International is obligated to return Class A ordinary shares to Baidu Holdings Limited by exercising the option to purchase additionalClass A ordinary shares from us or by making purchases in the open market. No fees or other remuneration will be paid by the underwriters to us or to Baidu Holdings Limited for the loan of the Class A ordinary shares.

If the international underwriters’ option to purchase additional Class A ordinary shares is exercised in full, the additionalClass A ordinary shares to be issued pursuant thereto will represent approximately 0.51% of our total Class A ordinary shares and Class B ordinary shares in issue immediately following the completion of the Global Offering, withouttaking into account the Class A ordinary shares to be issued pursuant to our share incentive plan, including pursuant to the exercise of options of the vesting of restricted share units or other awards that have been or may be granted from timeto time. If the international underwriters exercise their option to purchase additional Class A ordinary shares, an announcement will be made.

Lock-Up Agreements

We have undertaken to the underwriters that for the period commencing on date onwhich the Hong Kong public offering commences and ending on, and including, the date that is 90 days after the date on which the Hong Kong public offering commences (the “Lock-Up Period”), and unless in compliance with therequirements of the Hong Kong Listing Rules, we will not, directly or indirectly, take any of the following actions with respect to our Shares or ADSs or other securities of the Company, or any securities convertible into or exchangeable orexercisable for or that represent the right to receive, any of our Shares or ADSs or other securities of the Company (“Lock-Up Securities”):

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in each case whether any such transaction described in paragraphs (a), (b) or (c) above is to be settled

by delivery of Lock-Up Securities, in cash or otherwise, provided, however, that the Company shall be

permitted during the Lock-Up Period to:

Mr. Robin Yanhong Li and his spouse and all of our directors and executive officers haveeach agreed with the Joint Representatives (on behalf of the international underwriters and the Hong Kong underwriters) that, during the period commencing on the date on which the Hong Kong public offering and ending at the close of business of the90th day after the date on which the Hong Kong public offering, without the prior written consent of the Joint Representatives (for themselves and on behalf of the underwriters), they will not, among other things, directly or indirectly: (i) offer,sell, contract to sell, pledge, grant any option to purchase, purchase any option or contract to sell, make any short sale or otherwise dispose of any ADSs or Shares or any securities of the Company that are substantially similar to the ADSs orShares, or any options or warrants to purchase any ADSs or Shares, or any securities convertible into, exchangeable for or that represent the right to receive ADSs, Shares or any securities of the Company that are substantially similar to the ADSsor Shares, whether now owned or hereinafter acquired, owned directly by them (including holding as a custodian) or with respect to which they have beneficial ownership within the rules and regulations of the SEC and/or the SFO (such securitiescollectively, the “D&O Lock-Up Securities”); (ii) engage in any hedging or other or arrangements (including, without limitation, any short sale or the purchase or sale of, or entry into, any put or call option, or combinationthereof, forward, swap or any other derivative transaction or instrument, however described or defined) which is designed to or which reasonably could be expected to lead to or result in a sale or disposition or transfer of any economic consequencesof ownership, in whole or in part, directly or indirectly, of any D&O Lock-Up Securities; (iii) enter into any hedging, swap or other agreement or transaction that transfers, in whole or in part,

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any of the economic consequences of ownership of the D&O Lock-Up Securities; (iv) make any demand for, or exercise any right with respect to, the registration of any D&O Lock-UpSecurities, or (v) publicly disclose the intention to do any of (ii) to (iv) above, in each case subject to limited exceptions as described further below. For the purposes of the foregoing lock-up restrictions, the term “D&O Lock-UpSecurities” shall not include, and nothing in the foregoing lockup restrictions shall prohibit, any transaction relating only to, (i) ADSs or Shares purchased in open market transactions after the date on which the Hong Kong public offering(excluding, for the avoidance of doubt, any Shares purchased in the Global Offering), or (ii) ADSs or Shares acquired in private transactions after the date on which the Hong Kong public offering from third parties to the extent such acquired ADSsor Shares are not subject to any lock-up or similar transfer restrictions.

Among certain other exceptions, the restrictions describedabove do not apply to transfer of the D&O Lock-Up Securities:

Conditions of the Global Offering

Acceptance of all applications for Offer Shares will be conditional on:

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in each case on or before the dates and times specified in the respective underwriting agreements (unless and to the extent such conditions are validly waivedon or before such dates and times) and, in any event, not later than the date which is 30 days after the date of this prospectus supplement.

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If, for any reason, we do not agree with the Joint Representatives (for themselves and onbehalf of the underwriters) on the pricing of the Offer Shares on or before Monday, March 22, 2021, the Global Offering will not proceed and will lapse.

The consummation of each of the Hong Kong public offering and the international offering is conditional upon, among other things, the otheroffering becoming unconditional and not having been terminated in accordance with its terms.

Share certificates for the Offer Shares willonly become valid at 8:00 a.m. on Tuesday, March 23, 2021, provided that the Global Offering has become unconditional in all respects at or before that time.

Dealings Arrangements

Assuming that theHong Kong public offering becomes unconditional at or before 8:00 a.m. in Hong Kong on Tuesday, March 23, 2021, it is expected that dealings in the Class A ordinary shares on the Hong Kong Stock Exchange will commence at 9:00 a.m. on Tuesday,March 23, 2021. The Class A ordinary shares will be traded in board lots of 50 Class A ordinary shares each and the stock code of the Class A ordinary shares will be “9888.”

Indemnification

We have agreed toindemnify the several underwriters and their affiliates against certain liabilities, including liabilities under the Securities Act, and to contribute to payments that the underwriters may be required to make in respect of those liabilities.

Stabilization

Underwriters usestabilization in some markets to facilitate the distribution of securities. To stabilize, the underwriters may bid for, or purchase, the securities in the secondary market during a specified period of time, to retard and, if possible, prevent adecline in the initial public market price of the securities below the offer price. Such transactions may be effected in all jurisdictions where it is permissible to do so, in each case in compliance with all applicable laws and regulatoryrequirements, including those of Hong Kong. In Hong Kong, the price at which the stabilizing manager may bid for or purchase the securities is not permitted to exceed the Hong Kong public offer price.

In connection with the Global Offering, the stabilizing manager (or any person acting for it), on behalf of the underwriters, mayover-allocate or effect transactions with a view to stabilizing or supporting the market price of the Class A ordinary shares at a level higher than that which might otherwise prevail for a limited period after the date on which ourClass A ordinary shares are listed on the Hong Kong Stock Exchange. However, there is no obligation on the stabilizing manager (or any person acting for it) to conduct any such stabilizing action. Such stabilizing action, if taken,(a) will be conducted at the absolute discretion of the stabilizing manager (or any person acting for it) and in what the stabilizing manager reasonably regards as our best interest, (b) may be discontinued at any time and (c) isrequired to be brought to an end within 30 days after the last day for lodging applications under the Hong Kong public offering.

Stabilization action permitted in Hong Kong pursuant to the Securities and Futures (Price Stabilizing) Rules of the SFO includes(a) over-allocating for the purpose of preventing or minimizing any reduction in the market price of the Class A ordinary shares, (b) selling or agreeing to sell the Class A ordinary shares so as to establish a short position in themfor the purpose of preventing or minimizing any reduction in the market price of the Class A ordinary shares, (c) purchasing, or agreeing to purchase, the Class A ordinary shares pursuant to the exercise of the option by theunderwriters to purchase additional Class A ordinary shares in order to close out any position established under clauses (a) or (b) above, (d) purchasing, or agreeing to purchase, any of the Class A ordinary shares for the solepurpose of preventing or minimizing any reduction in the market price of the Class A ordinary shares, (e) selling or agreeing to sell any Class A ordinary shares in order to liquidate any position established as a result of thosepurchases and (f) offering or attempting to do anything as described in clauses (b), (c), (d) or (e) above.

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Specifically, prospective applicants for and investors in the Offer Shares should note that:

We will ensure or procure that an announcement in compliance with the Securities and Futures (Price Stabilizing) Rules of the SFO will be madewithin seven days of the expiration of the stabilization period.

In connection with the Global Offering, the underwriters may alsopurchase and sell Class A ordinary shares or ADSs in the open market in compliance with all applicable laws and regulations. These transactions may include short sales, stabilizing transactions and purchases to cover positions created by shortsales. Short sales involve the sale by the underwriters of a greater number of Class A ordinary shares than they are required to purchase in the offering or the sale by the underwriters of the ADSs, and a short position represents the amount ofsuch sales that have not been covered by subsequent purchases. A “covered short position” is a short position that is not greater than the amount of additional Class A ordinary shares (including Class A ordinary sharesrepresented by short sales of ADSs) for which the international underwriters’ option to purchase additional Class A ordinary shares may be exercised. The underwriters may cover any covered short position by either exercising their optionto purchase additional Class A ordinary shares or purchasing Class A ordinary shares or ADSs in the open market and converting such ADSs into Class A ordinary shares. In determining the source of Class A ordinary shares to coverthe covered short position, the underwriters will consider, among other things, the price of Class A ordinary shares or ADSs available for purchase in the open market as compared to the price at which they may purchase additional Class Aordinary shares pursuant to the option described above. Stabilizing transactions consist of various bids for or purchases of Class A ordinary shares or ADSs made by the underwriters in the open market.

The underwriters may also impose a penalty bid, whereby selling concessions allowed to dealers participating in the offering may be reclaimedif the securities sold by them are repurchased in connection with stabilization transactions. Purchases to cover a short position and stabilizing transactions, as well as other purchases by the underwriters for their own accounts, may have theeffect of preventing or retarding a decline in the market price of the Class A ordinary shares or ADSs, and together with the imposition of the penalty bid, may stabilize, maintain or otherwise affect the market price of the Class Aordinary shares or ADSs. As a result, the price of the Class A ordinary shares or ADSs may be higher than the price that otherwise might exist in the open market. The underwriters are not required to engage in these activities (which may startat any time in the U.S. market beginning on the price determination date) and may end any of these activities at any time. These transactions may be effected on the Nasdaq, on the Hong Kong Stock Exchange, in the over-the-counter market or otherwise.

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Activities by Underwriters

Described below are a variety of activities that each of the underwriters of the Global Offering may individually undertake, and which do notform part of the underwriting or the stabilizing process.

The underwriters and their affiliates are diversified financial institutionswith relationships in countries around the world. These entities engage in a wide range of commercial and investment banking, brokerage, funds management, trading, hedging, investing and other activities for their own account and for the account ofothers. In the ordinary course of their various business activities, the underwriters and their respective affiliates may purchase, sell or hold a broad array of investments and actively trade securities, derivatives, loans, commodities, currencies,credit default swaps and other financial instruments for their own account and for the accounts of their customers. Such investment and trading activities may involve or relate to assets, securities and/or instruments of our company and/or personsand entities with relationships with our company and may also include swaps and other financial instruments entered into for hedging purposes in connection with our loans and other debt.

In relation to the Class A ordinary shares, the activities of the underwriters and their affiliates could include acting as agent forbuyers and sellers of the Class A ordinary shares, entering into transactions with those buyers and sellers in a principal capacity, including as a lender to initial purchasers of the Class A ordinary shares (which financing may be securedby the Class A ordinary shares) in the Global Offering, proprietary trading in the Class A ordinary shares, and entering into over the counter or listed derivative transactions or listed or unlisted securities transactions (includingissuing securities such as derivative warrants listed on a stock exchange) which have as their underlying assets, assets including the Class A ordinary shares. Such transactions may be carried out as bilateral agreements or trades with selectedcounterparties. Those activities may require hedging activity by those entities involving, directly or indirectly, the buying and selling of the Class A ordinary shares, which may have a negative impact on the trading price of the Class Aordinary shares. All such activities could occur in Hong Kong and in the United States and elsewhere in the world and may result in the underwriters and their affiliates holding long and/or short positions in the Class A ordinary shares, inbaskets of securities or indices including the Class A ordinary shares, in units of funds that may purchase the Class A ordinary shares, or in derivatives related to any of the foregoing.

In relation to issues by underwriters or their affiliates of any listed securities having the Class A ordinary shares as their underlyingsecurities, whether on the Hong Kong Stock Exchange or on any other stock exchange, the rules of the stock exchange may require the issuer of those securities (or one of its affiliates or agents) to act as a market maker or liquidity provider in thesecurity, and this will also result in hedging activity in the Class A ordinary shares in most cases.

All such activities may occurboth during and after the end of the stabilizing period described in “—Stabilization” above. Such activities may affect the market price or value of the Class A ordinary shares, the liquidity or trading volume in the Class Aordinary shares and the volatility of the price of the Class A ordinary shares, and the extent to which this occurs from day to day cannot be estimated.

It should be noted that when engaging in any of these activities, the underwriters will be subject to certain restrictions, including thefollowings:

Certain of the underwriters or their respective affiliates have provided from time to time, and expect to provide in the future, investmentbanking, lending and other services to us and certain of our affiliates for which such underwriters or their respective affiliates have received or will receive customary fees and commissions.

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In addition, the underwriters or their respective affiliates may provide financing toinvestors to finance their subscriptions of Offer Shares in the Global Offering.

The address of Merrill Lynch (Asia Pacific) Limited is55/F Cheung Kong Center, 2 Queen’s Road Central, Central. Hong Kong. The address of CLSA Limited is 18/F, One Pacific Place, 88 Queensway, Hong Kong. The address of Goldman Sachs (Asia) L.L.C. is 68/F, Cheung Kong Center, 2 Queen’s Road,Central, Hong Kong.

Selling Restrictions

Australia

No placement document,prospectus, product disclosure statement or other disclosure document has been lodged with the Australian Securities and Investments Commission (“ASIC”), in relation to the Offering. This prospectus supplement, the accompanying prospectusor any other document or material in connection with the offer or sale, or invitation for subscription or purchase, of the Class A ordinary shares does not constitute a prospectus, product disclosure statement or other disclosure document underthe Corporations Act 2001 (the “Corporations Act”), and does not purport to include the information required for a prospectus, product disclosure statement or other disclosure document under the Corporations Act.

Any offer in Australia of the shares may only be made to persons (the “Exempt Investors”) who are “sophisticatedinvestors” (within the meaning of section 708(8) of the Corporations Act), “professional investors” (within the meaning of section 708(11) of the Corporations Act) or otherwise pursuant to one or more exemptions contained in section708 of the Corporations Act so that it is lawful to offer the shares without disclosure to investors under Chapter 6D of the Corporations Act.

The shares applied for by Exempt Investors in Australia must not be offered for sale in Australia in the period of 12 months after the date ofallotment under the offering, except in circumstances where disclosure to investors under Chapter 6D of the Corporations Act would not be required pursuant to an exemption under section 708 of the Corporations Act or otherwise or where the offer ispursuant to a disclosure document which complies with Chapter 6D of the Corporations Act. Any person acquiring shares must observe such Australian on-sale restrictions.

This prospectus supplement, the accompanying prospectus and any other document or material in connection with the offer or sale, or invitationfor subscription or purchase, of the Class A ordinary shares (i) contain general information only and do not take account of the investment objectives, financial situation or particular needs of any particular person; and (ii) do notcontain any securities recommendations or financial product advice. Before making an investment decision, investors need to consider whether the information herein is appropriate to their needs, objectives and circumstances, and, if necessary, seekexpert advice on those matters.

European Economic Area

In relation to each Member State of the European Economic Area (each a “Relevant State”), no Class A ordinary shares have beenoffered or will be offered pursuant to the Global Offering to the public in that Relevant State prior to the publication of a prospectus in relation to the Class A ordinary shares which has been approved by the competent authority in thatRelevant State or, where appropriate, approved in another Relevant State and notified to the competent authority in that Relevant State, all in accordance with the Prospectus Regulation, except that it may make an offer to the public in thatRelevant State of any Shares at any time under the following exemptions under the Prospectus Regulation:

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provided that no such offer of the Class A ordinary shares shall require us or any underwriter topublish a prospectus pursuant to Article 3 of the Prospectus Regulation or supplement a prospectus pursuant to Article 23 of the Prospectus Regulation.

For the purposes of this provision, the expression an “offer to the public” in relation to the Class A ordinary shares in anyRelevant State means the communication in any form and by any means of sufficient information on the terms of the offer and any Class A ordinary shares to be offered so as to enable an investor to decide to purchase or subscribe for anyClass A ordinary shares, and the expression “Prospectus Regulation” means Regulation (EU) 2017/1129.

United Kingdom

The Class A ordinary shares are not intended to be offered, sold or otherwise made available to and should not be offered, sold or otherwisemade available to any retail investor in the United Kingdom (“UK”). For these purposes, a retail investor means a person who is one (or more) of: (i) a retail client, as defined in point (8) of Article 2 of Regulation (EU) No 2017/565 asit forms part of domestic law by virtue of the European Union (Withdrawal) Act 2018 (“EUWA”); or (ii) a customer within the meaning of the provisions of the FSMA and any rules or regulations made under the FSMA to implement Directive (EU)2016/97, where that customer would not qualify as a professional client, as defined in point (8) of Article 2(1) of Regulation (EU) No 600/2014 as it forms part of domestic law by virtue of the EUWA. Consequently no key information document requiredby Regulation (EU) No 1286/2014 as it forms part of domestic law by virtue of the EUWA (the “UK PRIIPs Regulation”) for offering or selling the Class A ordinary shares or otherwise making them available to retail investors in the UK hasbeen prepared and therefore offering or selling the Class A ordinary shares or otherwise making them available to any retail investor in the UK may be unlawful under the UK PRIIPs Regulation.

Bermuda

The offer of theClass A ordinary shares under the International Offering is private and is not intended for the public. This offering circular has not been approved by the Bermuda Monetary Authority or the Registrar of Companies in Bermuda. Any representationto the contrary, explicit or implicit is prohibited.

British Virgin Islands

The Class A ordinary shares are not being and may not be offered to the public or to any person in the British Virgin Islands for purchaseor subscription. The Class A ordinary shares may be offered to companies incorporated under the BVI Business Companies Act, 2004 (“BVI Companies”), but only where the offer will be made to, and received by, the relevant BVI Companyentirely outside of the British Virgin Islands. This prospectus supplement and the accompanying prospectus have not been, and will not be, registered with the Financial Services Commission of the British Virgin Islands. No registered prospectus hasbeen or will be prepared in respect of the Class A ordinary shares for the purposes of the Securities and Investment Business Act, 2010 (“SIBA”) or the Public Issuers Code of the British Virgin Islands.

Canada

The Class A ordinaryshares may be sold only to purchasers purchasing, or deemed to be purchasing, as principal that are accredited investors, as defined in National Instrument 45-106 Prospectus Exemptions or subsection 73.3(1) ofthe Securities Act (Ontario), and are permitted clients, as defined in National Instrument 31-103 Registration Requirements, Exemptions and Ongoing Registrant Obligations. Any resale of the Class Aordinary shares must be made in accordance with an exemption from, or in a transaction not subject to, the prospectus requirements of applicable securities laws.

Securities legislation in certain provinces or territories of Canada may provide a purchaser with remedies for rescission or damages if thisprospectus supplement and the accompanying prospectus (including any amendment thereto) contains a misrepresentation, provided that the remedies for rescission or damages are exercised by the purchaser within the time limit prescribed by thesecurities legislation of the purchaser’s province or territory. The purchaser should refer to any applicable provisions of the securities legislation of the purchaser’s province or territory for particulars of these rights or consult witha legal advisor.

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Pursuant to section 3A.3 (or, in the case of securities issued or guaranteed by thegovernment of a non-Canadian jurisdiction, section 3A.4) of National Instrument 33-105 Underwriting Conflicts, or NI 33-105, theinternational underwriters are not required to comply with the disclosure requirements of NI 33-105 regarding underwriter conflicts of interest in connection with this offering.

Cayman Islands

The Class Aordinary shares may not be offered or sold, directly or indirectly, to the public or to any member of the public in the Cayman Islands.

France

This prospectus supplement and the accompanying prospectus have not been prepared in the context of a public offering ofsecurities in France within the meaning of Article L.411-1 of the French Code monétaire et financier and has therefore not been submitted to the Autorité des marches financiers, or the AMF, forclearance or otherwise.

Accordingly, the Class A ordinary shares have not been and will not be offered or sold, directly orindirectly, to the public in France and neither this offering circular nor any other offering material relating to the Class A ordinary shares has been distributed or caused to be distributed or will be distributed or caused to be distributedto the public in France, except to qualified investors (investisseurs qualifiés) and/or to a restricted circle of investors (cercle restreint d’investisseurs), provided that such investors are acting for their own account, and/or topersons providing portfolio management financial services (personnes fournissant le service d’investissement de gestion de portefeuille pour compte de tiers), all as defined and in accordance with ArticleL.411-2, D.411-1, D.411-2, D.734-1, D.744-1, D.754-1 and D.764-1 of the French Code monétaire et financier).

The Class A ordinary shares may only be offered or sold, directly or indirectly, to the public in the Republic of France in accordancewith applicable laws relating to public offerings (which are in particular set forth in Article L.411-1, L.411-2, L.412-1 and L.621-8 to L.621-8-3 of the French Code monétaire et financier).

Germany

This prospectussupplement and the accompanying prospectus are not being distributed in the context of, and do not constitute, a public offer of securities in Germany within the meaning of the German Securities Prospectus Act (Wertpapierprospektgesetz) whichimplemented the Prospectus Directive 2003/71/EC (the “Prospectus Directive”), and they have not been and will not be filed with, approved by or notified to the Federal Financial Supervisory Authority (Bundesanstalt fürFinanzdienstleistungsaufsicht). As a result, this prospectus supplement, copies thereof or any other documents relating to the offering or the Class A ordinary shares may not be distributed, and the Class A ordinary shares may not beoffered or sold in Germany other than to certain qualified investors or in transactions which are otherwise exempt from the prospectus requirement of the German Securities Prospectus Act (Wertpapierprospektgesetz).

Hong Kong

(i) The internationaloffer shares have not been offered or sold and will not be offered or sold in Hong Kong, by means of any document, other than to “professional investors” as defined in the Securities and Futures Ordinance and any rules made thereunder, orin circumstances which do not result in the document being a “prospectus” as defined in the Companies (Winding Up and Miscellaneous Provisions) Ordinance (Chapter 32 of the Laws of Hong Kong) or which do not constitute an offer to thepublic within the meaning thereof, and (ii) no advertisement, invitation or document relating to the international offer shares has been or may be issued or has been or may be in the possession of any person for the purposes of issue, whetherin Hong Kong or elsewhere, which is directed at, or the contents of which are likely to be accessed or read by, the public of Hong Kong

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(except if permitted under the securities laws of Hong Kong) other than with respect to the international offer shares which are or are intended to be disposed of only to persons outside HongKong or only to “professional investors” within the meaning ascribed to it in the Securities and Futures Ordinance and any rules made thereunder.

Italy

This prospectus supplementand the accompanying prospectus have not been and will not be filed with or cleared by the Italian securities exchange commission (Commissione Nazionale per le società e la Borsa, or the CONSOB) pursuant to Legislative Decree No. 58 ofFebruary 24, 1998, as amended, or the Finance Law, and to CONSOB Regulation No. 11971 of May 14, 1999, as amended, or the Issuers Regulation. Accordingly, copies of this prospectus supplement or any other document relating to theClass A ordinary shares may not be distributed, made available or advertised in Italy, nor may the Class A ordinary shares be offered, purchased, sold, promoted, advertised or delivered, directly or indirectly, to the public other than(i) to Professional Investors (as defined pursuant to article 31(2) of CONSOB Regulation No. 11522 of July 1, 1998, as amended, or the Intermediaries Regulation) pursuant to article 100 of the Finance Law; (ii) to prospectiveinvestors where the offer of the Class A ordinary shares relies on the exemption from the investment solicitation rules pursuant to, and in compliance with the conditions set out by article 100 of the Finance Law and article 33 of the IssuersRegulation, or by any applicable exemption; provided that any such offer, sale, promotion, advertising or delivery of the Class A ordinary shares or distribution of the offering circular, or any part thereof, or of any other document ormaterial relating to the Class A ordinary shares in Italy is made: (a) by investment firms, banks or financial intermediaries authorized to carry out such activities in the Republic of Italy in accordance with the Finance Law, the IssuersRegulation, Legislative Decree No. 385 of September 1, 1993, as amended, the Intermediaries Regulation, and any other applicable laws and regulations; and (b) in compliance with any applicable notification requirement or duty whichmay, from time to time, be imposed by CONSOB, Bank of Italy or by any other competent authority.

Japan

The Class A ordinary shares have not been and will not be registered under the Financial Instruments and Exchange Law of Japan (LawNo. 25 of 1948, as amended) and, accordingly, will not be offered or sold, directly or indirectly, in Japan, or for the benefit of any Japanese Person or to others for re-offering or resale, directly orindirectly, in Japan or to any Japanese Person, except in compliance with all applicable laws, regulations and ministerial guidelines promulgated by relevant Japanese governmental or regulatory authorities in effect at the relevant time. For thepurposes of this paragraph, “Japanese Person” means any person resident in Japan, including any corporation or other entity organized under the laws of Japan.

Kingdom of Saudi Arabia

Thisprospectus supplement and the accompanying prospectus may not be distributed in the Kingdom of Saudi Arabia except to such persons as are permitted under the Offers of Securities Regulations issued by the Capital Market Authority of the Kingdom ofSaudi Arabia (the “Capital Market Authority”).

The Capital Market Authority does not make any representation as to the accuracyor completeness of this prospectus supplement and the accompanying prospectus, and expressly disclaims any liability whatsoever for any loss arising from, or incurred in reliance upon, any part of this prospectus supplement or the accompanyingprospectus.

Prospective purchasers of the Class A ordinary shares under the international offering offered hereby should conducttheir own due diligence on the accuracy of the information relating thereto. If you do not understand the contents of this prospectus supplement and the accompanying prospectus, you should consult an authorized financial adviser.

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Korea

The Class A ordinary shares have not been and will not be registered with the Financial Services Commission of Korea for public offeringin Korea under the Financial Investment Services and Capital Markets Act (the “FSCMA”), and none of the Class A ordinary shares may be offered, sold or delivered, or offered or sold to any person forre-offering or resale, directly or indirectly in Korea or to any resident of Korea except pursuant to applicable laws and regulations of Korea, including the FSCMA and the Foreign Exchange Transaction Law (the“FETL”) and the decrees and regulations thereunder. Furthermore, the Class A ordinary shares may not be resold to Korean residents unless the purchaser of the Class A ordinary shares complies with all applicable regulatoryrequirements (including, but not limited to, governmental approval requirements under the FETL and its subordinate decrees and regulations) in connection with the purchase of the Class A ordinary shares.

Malaysia

No prospectus or otheroffering material or document in connection with the offer and sale of the Class A ordinary shares has been or will be registered with the Securities Commission of Malaysia, or Commission, for the Commission’s approval pursuant to theCapital Markets and Services Act 2007. Accordingly, this prospectus supplement, the accompanying prospectus and any other document or material in connection with the offer or sale, or invitation for subscription or purchase, of the Class Aordinary shares may not be circulated or distributed, nor may the Class A ordinary shares be offered or sold, or be made the subject of an invitation for subscription or purchase, whether directly or indirectly, to persons in Malaysia otherthan (i) a closed end fund approved by the Commission; (ii) a holder of a Capital Markets Services License; (iii) a person who acquires the Class A ordinary shares as principal, if the offer is on terms that the Class Aordinary shares may only be acquired at a consideration of not less than RM250,000 (or its equivalent in foreign currencies) for each transaction; (iv) an individual whose total net personal assets or total net joint assets with his or herspouse exceeds RM3 million (or its equivalent in foreign currencies), excluding the value of the primary residence of the individual; (v) an individual who has a gross annual income exceeding RM300,000 (or its equivalent in foreigncurrencies) per annum in the preceding twelve months; (vi) an individual who, jointly with his or her spouse, has a gross annual income of RM400,000 (or its equivalent in foreign currencies), per annum in the preceding twelve months;(vii) a corporation with total net assets exceeding RM10 million (or its equivalent in a foreign currencies) based on the last audited accounts; (viii) a partnership with total net assets exceeding RM10 million (or its equivalentin foreign currencies); (ix) a bank licensee or insurance licensee as defined in the Labuan Financial Services and Securities Act 2010; (x) an Islamic bank licensee or takaful licensee as defined in the Labuan Financial Services and Securities Act2010; and (xi) any other person as may be specified by the Commission; provided that, in the each of the preceding categories (i) to (xi), the distribution of the Class A ordinary shares is made by a holder of a Capital MarketsServices License who carries on the business of dealing in securities. The distribution in Malaysia of this prospectus supplement is subject to Malaysian laws. This prospectus supplement and the accompanying prospectus do not constitute and may notbe used for the purpose of public offering or an issue, offer for subscription or purchase, invitation to subscribe for or purchase any Class A ordinary shares requiring the registration of a prospectus with the Commission under the CapitalMarkets and Services Act 2007.

Singapore

This prospectus supplement and the accompanying prospectus have not been registered as a prospectus with the Monetary Authority of Singapore.Accordingly, this prospectus supplement and any other document or material in connection with the offer or sale, or invitation for subscription or purchase, of the Class A ordinary shares may not be circulated or distributed, nor may theClass A ordinary shares be offered or sold, or be made the subject of an invitation for subscription or purchase, whether directly or indirectly, to persons in Singapore other than (i) to an institutional investor under Section 274 ofthe Securities and Futures Act, Chapter 289 of Singapore, or the SFA, (ii) to a relevant person pursuant to Section 275(1), or any person pursuant to

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Section 275(1A), and in accordance with the conditions specified in Section 275, of the SFA, or (iii) otherwise pursuant to, and in accordance with the conditions of, any otherapplicable provision of the SFA.

Where the Class A ordinary shares are subscribed or purchased under Section 275 of the SFA bya relevant person which is:

In addition, investors in Singapore should note that the Class A ordinary sharesacquired by them are subject to resale and transfer restrictions specified under Section 276 of the SFA, and they, therefore, should seek their own legal advice before effecting any resale or transfer of their Class A ordinary shares.

State of Kuwait

The Class Aordinary shares have not been registered, authorized or approved for offering, marketing or sale in the State of Kuwait pursuant to Securities and Investment Funds Law of Kuwait No. 31/1990, as amended, and its executive bylaw, and as such theClass A ordinary shares shall not be offered or sold in the State of Kuwait. Interested investors from the State of Kuwait who approach us or any of the underwriters acknowledge this restriction and that this prospectus supplement, theaccompanying prospectus and any related materials shall be subject to all applicable foreign laws and rules; therefore, such investors must not disclose or distribute such materials to any other person.

Switzerland

The Class Aordinary shares may not be publicly offered in Switzerland and will not be listed on the SIX Swiss Exchange Ltd. (“SIX”) or any other stock exchange or other regulated trading facility in Switzerland. This offering circular has beenprepared without regard to the disclosure standards for issuance of prospectuses under Article 652a or Article 1156 of the Swiss Code of Obligations or disclosure standards for listing prospectuses under Article 27 et seqq. of the SIX Listing Rulesor the listing rules of any other stock exchange or regulated trading facility in Switzerland. Neither this prospectus supplement, nor the accompanying prospectus nor any other offering or marketing material relating to the Class A ordinaryshares or the offering thereof may be publicly distributed or otherwise made publicly available in Switzerland.

Neither this prospectussupplement, nor the accompanying prospectus nor any other offering or marketing material relating to the offering of the Class A ordinary shares, us or the Class A ordinary shares have been or

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will be filed with or approved by any Swiss regulatory authority. In particular, this prospectus supplement and the accompanying prospectus will not be filed with, and the offer of theClass A ordinary shares will not be supervised by, the Swiss Financial Market Supervisory Authority FINMA, and the offer of the Class A ordinary shares has not been and will not be authorized under the Swiss Federal Act on CollectiveInvestment Schemes (“CISA”). The investor protection afforded to acquirers of interests in collective investment schemes under the CISA does not extend to acquirers of the Class A ordinary shares.

PRC

This prospectus supplementhas not been and will not be circulated or distributed in the PRC, and the Class A ordinary shares may not be offered or sold, and will not be offered or sold to any person for re-offering or resale,directly or indirectly, to any residents of the PRC except pursuant to applicable laws and regulations of the PRC. For the purposes of this paragraph, the PRC does not include Taiwan, Hong Kong or Macau.

Taiwan

The Class A ordinaryshares have not been and will not be registered with the Financial Supervisory Commission of Taiwan pursuant to relevant securities laws and regulations and may not be sold, issued or offered within Taiwan through a public offering or incircumstances which constitutes an offer within the meaning of the Securities and Exchange Act of Taiwan that requires a registration or approval of the Financial Supervisory Commission of Taiwan. No person or entity in Taiwan has been authorized tooffer, sell, give advice regarding or otherwise intermediate the offering and sale of the Class A ordinary shares in Taiwan.

Qatar

This prospectus supplement and the accompanying prospectus is not intended to constitute an offer, sale or delivery of shares orother securities under the laws of the State of Qatar including the rules and regulations of Qatar Financial Centre Authority (“QFCA”) or the Qatar Financial Centre Regulatory Authority (“QFCRA”). The Class A ordinary shareshave not been and will not be listed on the Qatar Exchange and are not subject to the rules and regulations of the DSM Internal Regulations applying to the Qatar Exchange, the Qatar Financial Markets Authority (“QFMA”), the Qatar CentralBank (“QCB”), the QFCA or the QFCRA, or any laws of the State of Qatar.

This prospectus supplement and the accompanyingprospectus have not been and will not be:

The offer of the Class A ordinary shares and interests therein do not constitute a public offer of securities in the State of Qatar underthe Commercial Companies Law No. (5) of 2002 (as amended) or otherwise under any laws of the State of Qatar, including the rules and regulations of the QFCA or QFCRA.

The Class A ordinary shares are only being offered to a limited number of investors who are willing and able to conduct an independentinvestigation of the risks involved in an investment in such Shares. No transaction will be concluded in the jurisdiction of the State of Qatar (including the jurisdiction of the Qatar Financial Centre). We are not regulated by the QCB, QFMA, QFCAuthority, QFC Regulatory Authority or any other government authority in State of Qatar. We do not, by virtue of this offering circular, conduct any business in the State of Qatar. Our company is an entity regulated under laws outside the State ofQatar.

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United Arab Emirates

The Global Offering has not been approved or licensed by the UAE Central Bank or any other relevant licensing authority in the United ArabEmirates (including the Dubai International Financial Centre), and does not constitute a public offer of securities in the United Arab Emirates (including the Dubai International Financial Centre) in accordance with the Commercial Companies Law,Federal Law No. 8 of 1984 (as amended) or otherwise. Accordingly, the Class A ordinary shares may not be offered to the public in the United Arab Emirates (including the Dubai International Financial Centre).

The Class A ordinary shares may be offered, and this offering circular may be issued, only to a limited number of investors in the UnitedArab Emirates (including the Dubai International Financial Centre) who qualify as sophisticated investors under the relevant laws of the United Arab Emirates (and the Dubai International Financial Centre). The Class A ordinary shares will notbe offered, sold, transferred or delivered to the public in the United Arab Emirates (including the Dubai International Financial Centre).

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TAXATION

The following is a general summary of certain Cayman Islands, PRC and United States federal income tax consequences relevant to aninvestment in our Class A ordinary shares and our ADSs. The discussion is not intended to be, nor should it be construed as, legal or tax advice to any particular prospective purchaser. The discussion is based on laws and relevantinterpretations thereof in effect as of the date of this prospectus supplement, all of which are subject to change or different interpretations, possibly with retroactive effect. The discussion does not address U.S. state or local tax laws, or taxlaws of jurisdictions other than the Cayman Islands, the People’s Republic of China, Hong Kong and the United States. You should consult your own tax advisors with respect to the consequences of investment in our Class A ordinary sharesand our ADSs. To the extent that this discussion relates to matters of Cayman Islands tax law, it is the opinion of Maples and Calder (Hong Kong) LLP, our special Cayman Islands counsel. To the extent that the discussion states definitive legalconclusions under PRC tax laws and regulations, it is the opinion of King & Wood Mallesons, our special PRC counsel.

Cayman Islands andBritish Virgin Islands Taxation

We are not subject to income or capital gain tax under the current laws of the Cayman Islands and theBritish Virgin Islands. Additionally, upon payments of dividends by us, no Cayman Islands withholding tax will be imposed.

PRC Taxation

Under the PRC Enterprise Income Tax Law and its implementation rules, an enterprise established outside of the PRC with “de factomanagement body” within the PRC is considered a resident enterprise and will be subject to the enterprise income tax at the rate of 25% on its worldwide income as well as PRC enterprise income tax reporting obligations. The implementation rulesdefine the term “de facto management body” as the body that exercises full and substantial control and overall management over the business, productions, personnel, accounts and properties of an enterprise. In 2009, the StateAdministration of Taxation issued a circular, known as Circular 82, which provides certain specific criteria for determining whether the “de facto management body” of a Chinese-controlled overseas-incorporated enterprise is located inChina. Although this circular only applies to offshore enterprises controlled by PRC enterprises or PRC enterprise groups, not those controlled by PRC individuals or foreigners, the criteria set forth in the circular may reflect the StateAdministration of Taxation’s general position on how the “de facto management body” text should be applied in determining the tax resident status of all offshore enterprises. While we do not currently consider our company to be a PRCresident enterprise, there is a risk that the PRC tax authorities may deem our company as a PRC resident enterprise, in which case we would be subject to the PRC enterprise income tax at the rate of 25% on worldwide income. If the PRC taxauthorities determine that our company is a PRC resident enterprise for PRC enterprise income tax purposes and the competent PRC tax authorities consider dividends we pay with respect to our Class A ordinary shares or ADSs and the gainsrealized from the transfer of our Class A ordinary shares or ADSs to be income derived from sources within the PRC, we may be subject to PRC withholding tax at a rate of up to 10% from dividends we pay tonon-resident enterprise shareholders and holders of our ADSs, subject to any reduction or exemption set forth in relevant tax treaties. In addition, non-residententerprise shareholders (including our ADS holders) may be subject to a 10% PRC tax on gains realized on the sale or other disposition of ADSs or Class A ordinary shares, if such income is treated as sourced from within the PRC. Furthermore, ifwe are deemed a PRC resident enterprise, dividends payable to our non-PRC individual shareholders (including our ADS holders) and any gain realized on the transfer of ADSs or Class A ordinary shares bysuch shareholders may be subject to PRC tax at a rate of 20% subject to any reduction or exemption set forth in relevant tax treaties. It is also unclear whether non-PRC shareholders of our company (includingour ADS holders) would be able to claim the benefits of any tax treaties between their country of tax residence and the PRC in the event that we are treated as a PRC resident enterprise.

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Hong Kong Taxation

In connection with the Hong Kong public offering, we will establish a branch register of members in Hong Kong, or the Hong Kong share register.Dealings in our Class A ordinary shares registered on our Hong Kong share register will be subject to Hong Kong stamp duty. The stamp duty is charged to each of the seller and purchaser at the ad valorem rate of 0.1% of the consideration for,or (if greater) the value of, our Class A ordinary shares transferred. In other words, a total of 0.2% is currently payable on a typical sale and purchase transaction of our Class A ordinary shares. In addition, a fixed duty of HK$5.00 ischarged on each instrument of transfer (if required).

To facilitate ADS-ordinary share conversionand trading between Nasdaq and the Hong Kong Stock Exchange, we also intend to move a portion of our issued ordinary shares from our Cayman share registrer to our Hong Kong share register. It is unclear whether, as a matter of Hong Kong law, thetrading or conversion of ADSs constitutes a sale or purchase of the underlying Hong Kong-registered ordinary shares that is subject to Hong Kong stamp duty. We advise investors to consult their own tax advisors on this matter. See “RiskFactors—Risks Related to Our Ordinary Shares, ADSs and the Global Offering—There is uncertainty as to whether Hong Kong stamp duty will apply to the trading or conversion of our ADSs following our initial public offering in Hong Kong andlisting of our Class A ordinary shares on the Hong Kong Stock Exchange.”

U.S. Federal Income Tax Considerations

The following discussion is a summary of U.S. federal income tax considerations under present law of the ownership and disposition of the ADSsor ordinary shares. This summary applies only to investors that are U.S. Holders (as defined below) that acquire the ADSs or ordinary shares in the Global Offering and that hold such ADSs or ordinary shares as capital assets. This discussion isbased on the tax laws of the United States as in effect on the date of this prospectus supplement and on U.S. Treasury regulations in effect or, in some cases, proposed, as of the date of this prospectus supplement, as well as judicial andadministrative interpretations thereof available on or before such date. All of the foregoing authorities are subject to change, which change could apply retroactively and could affect the tax considerations described below.

The following discussion does not deal with the tax consequences to any particular investor or to persons in special tax situations such as:

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U.S. Holders are urged to consult their tax advisors about the application of the U.S. federal tax rulesto their particular circumstances as well as the state, local and foreign tax consequences to them of ownership and disposition of our ADSs or ordinary shares.

The discussion below of the U.S. federal income tax consequences will apply if you are a “U.S. Holder.” You are a “U.S.Holder” if you are the beneficial owner of our ADSs or ordinary shares and you are, for U.S. federal income tax purposes,

This discussion does not consider the tax treatment of partnerships or other pass-through entities that hold the ADSs or ordinary shares, orof persons who hold the ADSs or ordinary shares through such entities. If a partnership (or other entity classified as a partnership for U.S. federal income tax purposes) is the beneficial owner of the ADSs or ordinary shares, the U.S. federalincome tax treatment of a partner in the partnership will generally depend on the status of the partner and the activities of the partnership.

The discussion below assumes that the representations contained in the deposit agreement are true and that the obligations in the depositagreement and any related agreement will be complied with in accordance with their terms. If you hold our ADSs, you will be treated as the holder of the underlying ordinary shares represented by those ADSs for U.S. federal income tax purposes.

This discussion does not address any aspect of U.S. federal non-income tax laws, such as gift orestate tax laws, or state, local or foreign tax laws or the Medicare tax on certain net investment income. We have not sought, and will not seek, a ruling from the IRS, or an opinion as to any U.S. federal income tax consequence described herein.The IRS may disagree with the discussion herein, and its determination may be upheld by a court.

Taxation of Dividends and Other Distributions onthe ADSs or Ordinary Shares

Subject to the PFIC rules discussed below, the gross amount of all our distributions to you withrespect to the ADSs or ordinary shares will be included in your gross income as dividend income on the date of receipt by the depositary, in the case of our ADSs, or by you, in the case of ordinary shares, but only to the extent that thedistribution is paid out of our current or accumulated earnings and profits (computed under U.S. federal income tax principles). Because we do not intend to determine our earnings and profits on the basis of U.S. federal income tax principles, anydistribution paid will generally be treated as a “dividend” for U.S. federal income tax

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purposes. Dividends paid by us will not be eligible for the dividends-received deduction allowed to corporations in respect of dividends received from U.S. corporations.

With respect to non-corporate U.S. Holders (including individual U.S. Holders), dividends may be taxedat the lower applicable capital gains rate provided that (i) the ADSs or ordinary shares are readily tradable on an established securities market in the United States or we are eligible for the benefit of the income tax treaty between theUnited States and the PRC, or the Treaty, (ii) we are not a passive foreign investment company (as discussed below) for either our taxable year in which the dividend was paid or for the preceding taxable year, (iii) certain holding periodrequirements are met and (iv) such non-corporate U.S. Holders are not under an obligation to make related payments with respect to positions in substantially similar or related property. For this purpose,ADSs listed on the Nasdaq Global Select Market will generally be considered to be readily tradable on an established securities market in the United States. You should consult your tax advisor regarding the availability of the lower rate fordividends paid with respect to our ADSs or ordinary shares.

For U.S. foreign tax credit purposes, dividends paid on the ADSs or ordinaryshares will generally be treated as income from foreign sources and will generally constitute passive category income. If PRC withholding taxes apply to dividends paid to you with respect to the ADSs or ordinary shares, you may be able to obtain areduced rate of PRC withholding taxes under the Treaty. In addition, subject to certain conditions and limitations, PRC withholding taxes on dividends that are non-refundable under the Treaty may be treated asforeign taxes eligible for credit against your U.S. federal income tax liability. If you do not elect to claim a foreign tax credit, you may instead claim a deduction for U.S. federal income tax purposes in respect of such withholding, but only fora year in which you elect to do so for all creditable foreign income taxes. You should consult your tax advisor regarding the creditability of any PRC tax.

Sale, Exchange or Other Disposition of the ADSs or Ordinary Shares

Subject to the PFIC rules discussed below, you will recognize gain or loss on any sale, exchange or other taxable disposition of an ADS orordinary share equal to the difference between the amount realized for the ADS or ordinary share and your tax basis in the ADS or ordinary share. The gain or loss will generally be capital gain or loss. If you are anon-corporate U.S. Holder, including an individual U.S. Holder, who has held the ADS or ordinary share for more than one year, you will generally be eligible for reduced tax rates. The deductibility of capitallosses is subject to limitations. Any such gain or loss that you recognize will generally be treated as U.S. source income or loss for foreign tax credit limitation purposes, which will generally limit the availability of foreign tax credits.However, in the event we are deemed to be a PRC “resident enterprise” under PRC tax law, we may be eligible for the benefits of the Treaty. In such event, if PRC tax were to be imposed on any gain from the disposition of the ADSs orordinary shares, a U.S. Holder that is eligible for the benefits of the Treaty may elect to treat such gain as PRC source income. U.S. Holders should consult their tax advisors regarding the creditability of any PRC tax.

PFIC

A non-U.S. corporation, such as our own, is 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 onan 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 “asset test”). We will be treated as owning our proportionate share of theassets and earning our proportionate share of the income of any other corporation in which we own, directly or indirectly, at least 25% (by value) of the shares. Although the law in this regard is not entirely clear, we treat our variable interestentities as being owned by us for U.S. federal income tax purposes because we control their management decisions and we are entitled to receive economic benefits that could potentially be significant to them and, as a result, we consolidate theirresults of operations in our consolidated U.S. GAAP financial statements. If it were determined, however, that we are not the owner of our variable interest affiliated entities for

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U.S. federal income tax purposes, we would likely be treated as a PFIC for our taxable year ended December 31, 2021 and for subsequent taxable years.

Based on the market price of our ADSs and ordinary shares, the value of our assets, and the composition of our assets and income, we believethat we were not a PFIC for our taxable year ended December 31, 2020. However, given the lack of authority and the highly factual nature of the analyses, no assurance can be given. Our PFIC status for the current taxable year endingDecember 31, 2021 will not be determinable until the close of the taxable year, there can be no assurance that we will not be a PFIC for the current taxable year (or any future taxable year).

We must make a separate determination each year as to whether we are a PFIC. As a result, our PFIC status may change. In particular, becausethe total value of our assets for purposes of the asset test will generally be calculated using the market price of the ADSs and ordinary shares, our PFIC status will depend in large part on the market price of the ADSs and ordinary shares, whichmay fluctuate considerably. Accordingly, fluctuations in the market price of the ADSs and ordinary shares may result in our being a PFIC for any year. If we are a PFIC for any year during which you hold the ADSs or ordinary shares, we will generallycontinue to be treated as a PFIC for all succeeding years during which you hold such ADSs or ordinary shares. However, if we cease to be a PFIC, provided that you have not made amark-to-market election, as described below, you may avoid some of the adverse effects of the PFIC regime by making a deemed sale election with respect to the ADSs orordinary shares, as applicable.

If we are a PFIC for any taxable year during which you hold our ADSs or ordinary shares, you will besubject to special tax rules with respect to any “excess distribution” that you receive and any gain you realize from a sale or other disposition (including a pledge) of the ADSs or ordinary shares, unless you make a mark-to-market election as discussed below. Distributions you receive in a taxable year that are greater than 125% of the average annual distributions you received during theshorter of the three preceding taxable years or your holding period for the ADSs or ordinary shares will be treated as an excess distribution. Under these special tax rules:

The tax liability for amounts allocated to years prior to the year of disposition or “excess distribution” cannot be offset by anynet operating losses for such years, and gains (but not losses) realized on the sale of the ADSs or ordinary shares cannot be treated as capital, even if you hold the ADSs or ordinary shares as capital assets.

Alternatively, a U.S. Holder of “marketable stock” (as defined below) in a PFIC may make a mark-to-market election for such stock of a PFIC to elect out of the tax treatment discussed in the two preceding paragraphs. Themark-to-market election is available only for “marketable stock,” which is stock that is traded in other than de minimis quantities on at least 15 days duringeach calendar quarter, or “regularly traded,” on a qualified exchange or other market, as defined in applicable Treasury regulations. We expect that the ADSs will continue to be listed on the Nasdaq Global Select Market, which is aqualified exchange for these purposes, and, consequently, assuming that the ADSs are regularly traded, if you are a holder of our ADSs, it is expected that themark-to-market election would be available to you were we to become a PFIC. However, amark-to-market election may not be made with respect to our ordinary shares as they are not marketable stock. If you make a

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valid mark-to-market election for the ADSs, you will include in income each year an amount equal to the excess, ifany, of the fair market value of the ADSs as of the close of your taxable year over your adjusted basis in such ADSs. You are allowed a deduction for the excess, if any, of the adjusted basis of the ADSs over their fair market value as of the closeof the taxable year. Such deductions, however, are allowable only to the extent of any net mark-to-market gains on the ADSs included in your income for prior taxableyears. Amounts included in your income under a mark-to-market election, as well as gain on the actual sale or other disposition of the ADSs, are treated as ordinaryincome. Ordinary loss treatment also applies to the deductible portion of any mark-to-market loss on the ADSs, as well as to any loss realized on the actual sale ordisposition of the ADSs, to the extent that the amount of such loss does not exceed the net mark-to-market gains previously included for such ADSs. Your basis in theADSs will be adjusted to reflect any such income or loss amounts. If you make such a mark-to-market election, tax rules that apply to distributions by corporations whichare not PFICs would apply to distributions by us (except that the lower applicable capital gains rate would not apply).

Because, as atechnical matter, a mark-to-market election cannot be made for any lower-tier PFICs that we may own, a U.S. Holder may continue to be subject to the general PFIC rulesdescribed above with respect to such U.S. Holder’s indirect interest in any investments held by us that are treated as an equity interest in a PFIC for U.S. federal income tax purposes.

Alternatively, a U.S. Holder may avoid the PFIC tax consequences described above in respect to its ADSs and ordinary shares by making a timely“qualified electing fund,” or QEF, election. To comply with the requirements of a QEF election, a U.S. Holder must receive certain information from us. Because we do not intend to provide such information, however, such election will notbe available to you with respect to the ADSs or ordinary shares.

If you hold our ADSs or ordinary shares in any year in which we are aPFIC, you will be required to file an annual information report containing such information as the U.S. Treasury may require.

You areurged to consult your tax advisor regarding the application of the PFIC rules to your investment in our ADSs or ordinary shares.

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LEGAL MATTERS

We are being represented by Skadden, Arps, Slate, Meagher & Flom LLP and Skadden, Arps, Slate, Meagher & Flom with respectto certain legal matters of United States federal securities law, New York State law and Hong Kong law, by Maples and Calder (Hong Kong) LLP with respect to legal matters of Cayman Islands law, and by King & Wood Mallesons with respect tolegal matters of PRC law. The underwriters are being represented by Davis Polk & Wardwell LLP with respect to certain legal matters of United States federal securities law, New York State law and Hong Kong law and by Haiwen &Partners with respect to legal matters of PRC law. The validity of the Class A ordinary shares offered in the Global Offering and legal matters as to Cayman Islands law will be passed upon for us by Maples and Calder (Hong Kong) LLP. Certainlegal matters as to PRC law will be passed upon for us by King & Wood Mallesons and for the underwriters by Haiwen & Partners. Skadden, Arps, Slate, Meagher & Flom LLP, Skadden, Arps, Slate, Meagher & Flom and Maplesand Calder (Hong Kong) LLP may rely upon King & Wood Mallesons with respect to matters governed by PRC law. Davis Polk & Wardwell LLP may rely upon Haiwen & Partners with respect to matters governed by PRC law.

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EXPERTS

The consolidated financial statements of Baidu, Inc. appearing in Baidu, Inc.’s Annual Report (Form20-F) for the year ended December 31, 2020 and the effectiveness of Baidu, Inc.’s internal control over financial reporting as of December 31, 2020 have been audited by Ernst & YoungHua Ming LLP, independent registered public accounting firm, as set forth in their reports thereon, included therein, and incorporated herein by reference. Such consolidated financial statements are incorporated herein by reference in reliance uponsuch reports given on the authority of such firm as experts in accounting and auditing. The offices of Ernst & Young Hua Ming LLP are located at Level 16, Ernst & Young Tower, Tower E3, Oriental Plaza, No. 1 East Chang AnAvenue, Dong Cheng District, Beijing 100738, The People’s Republic of China.

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PROSPECTUS

Baidu, Inc.

Class A Ordinary Shares

We may from time to time in one or more offerings offer and sell our Class A ordinary shares, including Class A ordinary sharesrepresented by American depositary shares, or ADSs.

In addition, from time to time, the selling shareholders (if any) to be named in aprospectus supplement may offer and sell our Class A ordinary shares or ADSs held by them. The selling shareholders (if any) may sell our Class A ordinary shares or ADSs through public or private transactions at prevailing market prices orat privately negotiated prices. We will not receive any proceeds from the sale of ordinary shares by selling shareholders (if any).

Wewill provide the specific terms of any offering in one or more supplements to this prospectus. Any prospectus supplement may also add, update, or change information contained in this prospectus. You should carefully read this prospectus and theapplicable prospectus supplement as well as the documents incorporated or deemed to be incorporated by reference in this prospectus before you purchase any of the securities offered hereby.

These securities may be offered and sold in the same offering or in separate offerings; to or through underwriters, dealers, and agents; ordirectly to purchasers. The names of any underwriters, dealers, or agents involved in the sale of our securities, their compensation and any over-allotment options held by them will be described in the applicable prospectus supplement. For a morecomplete description of the plan of distribution of these securities, see the section entitled “Plan of Distribution” beginning on page 26 of this prospectus.

Our ADSs are listed on the Nasdaq Global Select Market under the symbol “BIDU.” On March 5, 2021, the last reported sale priceof the ADSs on the Nasdaq Global Select Market was US$261.72 per ADS.

Investing in our securities involves risks. You should carefullyconsider the risks described under “Risk Factors” on page 7 of this prospectus, in any accompanying prospectus supplement or in the documents incorporated by reference into this prospectus before making adecision to invest in our securities.

This prospectus may not be used to offer or sell any securities unless accompanied by aprospectus supplement.

We may offer and sell these securities to or through one or more agents, underwriters, dealers or other thirdparties or directly to one or more purchasers on a continuous or delayed basis. The names of any underwriters will be stated in the applicable prospectus supplement.

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

Thedate of this prospectus is March 9, 2021.

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