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

Clayton Williams Energy, Inc. C (symbol: CWEI) was one of the worst losers
of the trading day today (2016-08-31), losing -7.46%. The number of shares
that changed hands was 684,964, or about 1 times the average daily volume
in the stock.
The closing price was $63.11, amounting to a market cap of $767,990,000,
about -10.95% off the highest price in the last 12 months. The stock has
been trading at a range between $6.35 and $70.87.
CWEI is in the Oil & Gas Production industry, part of the Energy sector. It
first went public in 1993.