$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 (2015-09-09), losing -11.09%. The number of shares
that changed hands was 13,667,656, or about 2 times the average daily
volume in the stock.
The closing price was $16.52, amounting to a market cap of $3,370,000,000,
about -80.83% off the highest price in the last 12 months. The stock has
been trading at a range between $13.5 and $86.19.
WLL is in the Oil & Gas Production industry, part of the Energy sector. It
first went public in 2003.