$PWE is one of biggest losers #stocks today. read more:

Penn West Petroleum Ltd (symbol: PWE) was one of the worst losers of the
trading day today (2015-07-15), losing -9.26%. The number of shares that
changed hands was 2,626,911, or about 1 times the average daily volume in
the stock.
The closing price was $1.47, amounting to a market cap of $738,180,000,
about -84.31% off the highest price in the last 12 months. The stock has
been trading at a range between $1.3 and $9.37.
PWE is in the Oil & Gas Production industry, part of the Energy sector.