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

Callon Petroleum Company (symbol: CPE) was one of the biggest winners of
the trading day today (2016-04-20), gaining 12.11%. The number of shares
that changed hands was 37,828,335, or about 11.9 times the average daily
volume in the stock.
The closing price was $10.0, amounting to a market cap of $662,870,000,
about -1.77% off the highest price in the last 12 months. The stock has
been trading at a range between $4.21 and $10.18.
CPE is in the Oil & Gas Production industry, part of the Energy sector.