$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 (2016-02-01), losing -9.39%. The number of shares
that changed hands was 16,180,651, or about 1 times the average daily
volume in the stock.
The closing price was $6.66, amounting to a market cap of $1,360,000,000,
about -83.98% 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.