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

GNC Holdings, Inc. Class A Comm (symbol: GNC) was one of the worst losers
of the trading day today (2015-10-29), losing -26.92%. The number of shares
that changed hands was 22,625,397, or about 14 times the average daily
volume in the stock.
The closing price was $28.24, amounting to a market cap of $2,400,000,000,
about -45.37% off the highest price in the last 12 months. The stock has
been trading at a range between $26.34 and $51.69.
GNC is in the Food Chains industry, part of the Consumer Non-Durables
sector. It first went public in 2011.
Looking at its valuation, the stock is now trading at 10.15 times earnings.