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

Chesapeake Energy Corporation C (symbol: CHK) was one of the worst losers
of the trading day today (2015-07-21), losing -9.54%. The number of shares
that changed hands was 47,680,680, or about 2 times the average daily
volume in the stock.
The closing price was $9.29, amounting to a market cap of $6,160,000,000,
about -66.32% off the highest price in the last 12 months. The stock has
been trading at a range between $9.24 and $27.58.
CHK is in the Oil & Gas Production industry, part of the Energy sector.