$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 (2016-05-02), losing -10.08%. The number of shares
that changed hands was 29,397,078, or about 1 times the average daily
volume in the stock.
The closing price was $10.79, amounting to a market cap of $2,210,000,000,
about -72.44% off the highest price in the last 12 months. The stock has
been trading at a range between $3.35 and $39.15.
WLL is in the Oil & Gas Production industry, part of the Energy sector. It
first went public in 2003.