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

CGG (symbol: CGG) was one of the worst losers of the trading day today
(2015-09-22), losing -12.38%. The number of shares that changed hands was
18,722, or about 1 times the average daily volume in the stock.
The closing price was $3.75, amounting to a market cap of $663,990,000,
about -65.75% off the highest price in the last 12 months. The stock has
been trading at a range between $3.63 and $10.95.
CGG is in the Oil & Gas Production industry, part of the Energy sector.