$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 (2016-08-22), losing -5.81%. The number of shares that
changed hands was 1,568,419, or about 1 times the average daily volume in
the stock.
The closing price was $1.62, amounting to a market cap of $813,500,000,
about -8.99% off the highest price in the last 12 months. The stock has
been trading at a range between $0.45 and $1.78.
PWE is in the Oil & Gas Production industry, part of the Energy sector.