[Item 1: Reporting Person - FMR LLC Item 4: Delaware Item 5: 431,840 Item 6: 0 Item 7: 759,587 Item 8: 0 Item 9: 759,587 Item 11: 2.799% Item 12: HC Cusip #G07034104 Item 1: Reporting Person - Edward C. Johnson 3d Item 5: 0 Item 6: 0 Item 7: 759,587 Item 8: 0 Item 9: 759,587 Item 11: 2.799%]

[S.S. or I.R.S. Identification No. of Above Person T. ROWE PRICE ASSOCIATES, INC. 52-0556948 2 Check the Appropriate Box if a Member of a Group* (a) ____ NOT APPLICABLE (b) ____ 3 SEC Use Only ______________________________ 4 Citizenship or Place of Organization MARYLAND Number of 5 Sole Voting Power ** Shares 485,445 Beneficially 6 Shared Voting Power ** Owned By]

[Joint Filing Agreement [Remainder of this page has been left intentionally blank.] Robin Yanhong Li Robin Yanhong Li Handsome Reward Limited EX-99.(A) 2 d484941dex99a.htm EX-99.(A)] [CUSIP No. G07034104 13G Page 2 of 8 Pages 1 Name of Reporting Person Robin Yanhong Li 2 Check the Appropriate Box if a Member of a Group ¨ ¨ (a)]

[1. Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only). Baillie Gifford & Co (Scottish partnership) _______________________________________________________________________ 2. Check the Appropriate Box if a Member of a Group (See Instructions) (a).................................................................... (b).................................................................... _______________________________________________________________________ 3. SEC Use Only _______________________________________________________________________ 4. Citizenship or Place of Organization SCOTLAND UK _______________________________________________________________________ Number of 5. Sole Voting Power 1690882 Shares Bene ______________________________________________________]