21Vianet Group Inc. (VNET)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Imc-chicago, LlcCALL	90,900	$745,380	0%
2.	Imc-chicago, LlcPUT	56,000	$459,200	0%
3.	Imc-chicago, Llc	25,992	$213,134	0%
4.	Parallel Advisors, Llc	5,058	$41,476	0%
5.	Rhumbline Advisers	2,877	$23,591	0%