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

Alliance Holdings GP, L.P. (symbol: AHGP) was one of the worst losers of
the trading day today (2015-12-29), losing -4.74%. The number of shares
that changed hands was 169,462, or about 1 times the average daily volume
in the stock.
The closing price was $20.52, amounting to a market cap of $1,230,000,000,
about -67.22% off the highest price in the last 12 months. The stock has
been trading at a range between $15.71 and $62.59.
AHGP is in the Coal Mining industry, part of the Energy sector. It first
went public in 2006.
Looking at its valuation, the stock is now trading at 4.84 times earnings.