$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 (2015-12-28), losing -12.6%. The number of shares
that changed hands was 15,280,112, or about 1 times the average daily
volume in the stock.
The closing price was $8.81, amounting to a market cap of $1,800,000,000,
about -78.81% off the highest price in the last 12 months. The stock has
been trading at a range between $8.12 and $41.57.
WLL is in the Oil & Gas Production industry, part of the Energy sector. It
first went public in 2003.