[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]

[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]

[Joint Filing Agreement Remainder of this page has been left intentionally blank [ Limin Li Limin Li Front Lead Investments Limited West Lee Authorized Signatory of Malte International Holdings Limited, as sole director Heather Tang Authorized Signatory of Malte International Holdings Limited, as sole director Malte International Holdings Limited West Lee] [1 Name of reporting person Limin Li 2 Check the appropriate box if a member of a group ¨ x (a) 3 Sec use only 4]