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

Whiting Petroleum Corporation C (symbol: WLL) was one of the worst losers
of the trading day today (2016-01-18), losing -15.26%. The number of shares
that changed hands was 23,292,037, or about 2 times the average daily
volume in the stock.
The closing price was $5.72, amounting to a market cap of $1,170,000,000,
about -86.24% off the highest price in the last 12 months. The stock has
been trading at a range between $5.59 and $41.57.
WLL is in the Oil & Gas Production industry, part of the Energy sector. It
first went public in 2003.