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

Antero Resources Corporation Co (symbol: AR) was one of the worst losers of
the trading day today (2015-12-30), losing -7.32%. The number of shares
that changed hands was 2,757,211, or about 1 times the average daily volume
in the stock.
The closing price was $21.51, amounting to a market cap of $5,960,000,000,
about -53.3% off the highest price in the last 12 months. The stock has
been trading at a range between $18.5 and $46.06.
AR is in the Oil & Gas Production industry, part of the Energy sector. It
first went public in 2013.
Looking at its valuation, the stock is now trading at 4.19 times earnings.