SGOC [SGOCO] SC 13D: (Original Filing)

[Sze Kit Ting 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) o b) o 3 SEC USE ONLY 4 SOURCE OF FUNDS 5 o 6 CITIZENSHIP OR PLACE OF ORGANIZATION NUMBER OF 7 2,860,000 Shares SOLE VOTING POWER 8 0 Shares SHARED VOTING POWER 9 2,860,000 Shares SOLE DISPOSITIVE POWER 10 0 Shares SHARED DISPOSITIVE POWER]

VNET [21Vianet] SC 13G: (Original Filing)

[JOINT FILING AGREEMENT Dated: February 2, 2012 Matrix Partners China I, L.P. David Su Director Matrix Partners China I-A, L.P. David Su Director Matrix China Management I, L.P. David Su Director Matrix China I GP GP, Ltd. David Su] [SCHEDULE 13G (Rule 13d–102) (Amendment No. _________) * 21Vianet Group, Inc. (Name of Issuer) Class A Ordinary Shares, par value US$0.00001 per share (Title of Class of Securities) 90138A 10 3 (CUSIP Number) December 31, 2011 (Date of Event Which Requires Filing of this Statement) o Rule 13d-1(b) o Rule 13d-1(c) x Rule 13d-1(d) *The remainder of this cover page]

SGOC [SGOCO] SC 13D: Sze Kit Ting 2 CHECK THE APPROPRIATE BOX

[Sze Kit Ting 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) o b) o 3 SEC USE ONLY 4 SOURCE OF FUNDS 5 o 6 CITIZENSHIP OR PLACE OF ORGANIZATION NUMBER OF 7 2,860,000 Shares SOLE VOTING POWER 8 0 Shares SHARED VOTING POWER 9 2,860,000 Shares SOLE DISPOSITIVE POWER 10 0 Shares SHARED DISPOSITIVE POWER]

VNET [21Vianet] SC 13G: JOINT FILING AGREEMENT Dated: February 2, 2012 Matrix

[JOINT FILING AGREEMENT Dated: February 2, 2012 Matrix Partners China I, L.P. David Su Director Matrix Partners China I-A, L.P. David Su Director Matrix China Management I, L.P. David Su Director Matrix China I GP GP, Ltd. David Su] [SCHEDULE 13G (Rule 13d–102) (Amendment No. _________) * 21Vianet Group, Inc. (Name of Issuer) Class A Ordinary Shares, par value US$0.00001 per share (Title of Class of Securities) 90138A 10 3 (CUSIP Number) December 31, 2011 (Date of Event Which Requires Filing of this Statement) o Rule 13d-1(b) o Rule 13d-1(c) x Rule 13d-1(d) *The remainder of this cover page]

SGOC [SGOCO] SC 13D: Sun Zone Investments Limited 2 CHECK THE APPROPRIATE

[Sun Zone Investments Limited 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) o (b) o 3 SEC USE ONLY 4 SOURCE OF FUNDS 5 o 6 CITIZENSHIP OR PLACE OF ORGANIZATION NUMBER OF 7 0 Shares SOLE VOTING POWER 8 9,440,000 Shares SHARED VOTING POWER 9 0 Shares SOLE DISPOSITIVE POWER 10 9,440,000 Shares SHARED DISPOSITIVE]

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