$VNET is one of biggest losers #stocks today. read more:

21Vianet Group, Inc. (symbol: VNET) was one of the worst losers of the
trading day today (2016-06-15), losing -7.28%. The number of shares that
changed hands was 2,867,050, or about 2 times the average daily volume in
the stock.
The closing price was $11.33, amounting to a market cap of $989,860,000,
about -48.0% off the highest price in the last 12 months. The stock has
been trading at a range between $11.23 and $21.79.
VNET is in the Computer Software: Programming, Data Processing industry,
part of the Technology sector. It first went public in 2011.