当当在美国上市的招股说明书,可详细了解当当的有关信息。

Directed share program

At our request, the underwriters have reserved for sale, at the initial public up to 1,020,000 ADSs offered by this prospectus to our directors, officers business associates and related persons.

Risk factors 8 Table of Contents

See "Risk Factors" and other information included in this prospectus for a risks that you should carefully consider before investing in our ADSs.

The number of common shares that will be outstanding immediately after this offering:

assumes conversion of all outstanding series A, series B and series C convertible preferred shares into 137,549,95 common shares upon the completion of this offering; assumes no exercise of the underwriters' over-allotment option;

excludes 32,823,600 Class A common shares issuable upon the exercise of options outstanding as of the date of th at a weighted average exercise price of US$0.604 per share; and excludes 10,362,270 Class A common shares reserved for future issuances under our 2010 share incentive plan. 9

Table of Contents OUR SUMMARY CONSOLIDATED FINANCIAL DATA The following summary consolidated statements of operations and cash flow data for the years ended December 31, 2007, 2008 and 2009 and the summary balance sheet data as of December 31, 2008 and 2009 have been derived from our audited consolidated financial statements included elsewhere in this prospectus. Our summary consolidated balance sheet data as of December 31, 2007 has been derived from our audited consolidated financial statements not included in this prospectus. Our audited consolidated financial statements are prepared and presented in accordance with U.S. GAAP. The selected consolidated statement of operations data for the nine months ended September 30, 2009 and 2010 and the selected consolidated balance sheet data as of September 30, 2010 have been derived from our unaudited consolidated financial statements included elsewhere in this prospectus. The unaudited consolidated financial statements have been prepared on the same basis as our audited consolidated financial statements and include all adjustments, consisting only of normal and recurring adjustments, that we consider necessary for a fair presentation of our financial position and operating results for the periods presented. Our historical results for any period are not necessarily indicative of results to be expected for any future period. You should read the following summary financial information in conjunction with the consolidated financial statements and related notes and the information under "Management's Discussion and Analysis of Financial Condition and Results of Operations" included elsewhere in this prospectus.

For the Year Ended December 31, 2007 RMB 2008 RMB RMB 2009 US$

For the Ni

ne Months Ended Se 2009 RMB RMB

(in thousands, except for share and per share data)