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[Hongyi Zhou (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) ¨ (b) x (3) SEC USE ONLY (4) CITIZENSHIP OR PLACE OF ORGANIZATION People’s Republic of China]

[Item 1: Reporting Person - FMR LLC Item 4: Delaware Item 5: 306,900 Item 6: 0 Item 7: 720,750 Item 8: 0 Item 9: 720,750 Item 11: 1.333% Item 12: HC Cusip #74734M927 Item 1: Reporting Person - Edward C. Johnson 3d Item 5: 0 Item 6: 0 Item 7: 720,750 Item 8: 0 Item 9: 720,750 Item 11: 1.333%]

[CUSIP NO. 74734M109 13 G Page 2 of 12 Pages 1 NAME OF REPORTING PERSON SEQUOIA CAPITAL CHINA I, L.P. (“SCC I”) I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) 20-3514012 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP ¨ x (a) 3 SEC USE ONLY]

[Joint Filing Agreement Dated: February 7, 2013 TRUSTBRIDGE PARTNERS III, L.P. Shujun Li Authorized Representative TB PARTNERS GP3, L.P. Shujun Li Authorized Representative TB PARTNERS GP LIMITED Shujun Li Authorized Representative TB ALTERNATIVE ASSETS LTD. Shujun Li Authorized Representative EX-99.(A) 2 d482106dex99a.htm EX-99.(A)] [SCHEDULE 13G CUSIP No. 74734M109 Page 2 of 10 Pages (1) Names of reporting persons/I.R.S. identification nos. of above persons (entities only) Trustbridge Partners III, L.P. (2) Check the appropriate box if a member of a group]