1、Table of ContentsZUNITED STATESSECURITIES AND EXCHANGE COMMISSIONWashington,D.C.20549FORM 20-F(Mark One)REGISTRATION STATEMENT PURSUANT TO SECTION 12(b)OR(g)OF THE SECURITIES EXCHANGE ACT OF 1934ORANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscal year
2、ended December 31,2020ORTRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF 1934ORSHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF 1934Date of event requiring this shell company report.For the transition period from toCommission fil
3、e number 001-3512621Vianet Group,Inc.(Exact name of Registrant as specified in its charter)N/A(Translation of Registrants name into English)Cayman Islands(Jurisdiction of incorporation or organization)Guanjie Building Southeast 1st Floor,10#Jiuxianqiao East RoadChaoyang DistrictBeijing,100016The Peo
4、ples Republic of China(Address of principal executive offices)Ms.Sharon Xiao Liu,Chief Financial Officer21Vianet Group,Inc.Guanjie Building,Southeast 1st Floor 10#Jiuxianqiao East RoadChaoyang DistrictBeijing,100016The Peoples Republic of ChinaPhone:(86)10 8456-2121Facsimile:(86)10 8456-4234(Name,Te
5、lephone,E-mail and/or Facsimile number and Address of Company Contact Person)Securities registered or to be registered pursuant to Section 12(b)of the Act:Table of ContentsTitle of each classTrading Symbol(s)Name of each exchange on which registeredAmerican depositary shares,each representing six Cl
6、ass A ordinaryshares,par value US$0.00001 per shareVNET NASDAQ Global Select MarketClass A ordinary shares,par value US$0.00001 per share*Not for trading,but only in connection with the listing on the Nasdaq Global Select Market of the American depositary sharesSecurities registered or to be registe