$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 (2016-05-25), losing -5.87%. The number of shares that
changed hands was 5,930,288, or about 5 times the average daily volume in
the stock.
The closing price was $12.98, amounting to a market cap of $1,130,000,000,
about -42.54% off the highest price in the last 12 months. The stock has
been trading at a range between $12.53 and $22.59.
VNET is in the Computer Software: Programming, Data Processing industry,
part of the Technology sector. It first went public in 2011.