$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 (2016-01-19), losing -17.48%. The number of shares
that changed hands was 22,780,724, or about 2 times the average daily
volume in the stock.
The closing price was $4.72, amounting to a market cap of $963,550,000,
about -88.65% off the highest price in the last 12 months. The stock has
been trading at a range between $4.55 and $41.57.
WLL is in the Oil & Gas Production industry, part of the Energy sector. It
first went public in 2003.