$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 (2016-08-17), losing -12.46%. The number of shares that
changed hands was 6,440,980, or about 4 times the average daily volume in
the stock.
The closing price was $9.2, amounting to a market cap of $803,770,000,
about -56.85% off the highest price in the last 12 months. The stock has
been trading at a range between $8.76 and $21.32.
VNET is in the Computer Software: Programming, Data Processing industry,
part of the Technology sector. It first went public in 2011.