$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 (2016-02-18), losing -11.92%. The number of shares
that changed hands was 17,035,118, or about 1 times the average daily
volume in the stock.
The closing price was $4.73, amounting to a market cap of $965,590,000,
about -88.62% off the highest price in the last 12 months. The stock has
been trading at a range between $4.01 and $41.57.
WLL is in the Oil & Gas Production industry, part of the Energy sector. It
first went public in 2003.