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

Penn West Petroleum Ltd (symbol: PWE) was one of the biggest winners of the
trading day today (2015-07-21), gaining 11.63%. The number of shares that
changed hands was 4,196,391, or about 1.5 times the average daily volume in
the stock.
The closing price was $1.44, amounting to a market cap of $723,110,000,
about -84.63% off the highest price in the last 12 months. The stock has
been trading at a range between $1.27 and $9.37.
PWE is in the Oil & Gas Production industry, part of the Energy sector.