[SCHEDULE 13G PAGE 2 of 10 CUSIP No. 92833U103 (1) Name of reporting person]

[Item 1: Reporting Person - FMR LLC Item 4: Delaware Item 5: 1,755,226 Item 6: 0 Item 7: 5,346,842 Item 8: 0 Item 9: 5,346,842 Item 11: 7.456% Item 12: HC Cusip #92833U921 Item 1: Reporting Person - Edward C. Johnson 3d Item 5: 0 Item 6: 0 Item 7: 5,346,842 Item 8: 0 Item 9: 5,346,842 Item 11: 7.456%]

[*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page. The information required in the remainder of this cover page shall not be deemed to]

[Joint Filing Agreement Remainder of this page has been left intentionally blank [ Massive Sheen Investments Limited Yanqing Liang Director Yanqing Liang Yanqing Liang EX-99 2 dex99.htm JOINT FILING AGREEMENT] [1 Name of reporting person Yanqing Liang 2 Check the appropriate box if a member of a group ¨ x (a) 3]

[CUSIP No 92833U103 13G Page 2 of 6 1 NAMES OF REPORTING PERSONS Columbia Wanger Asset Management, L.P. 04-3519872 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 Delaware NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH 5]