$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 (2016-10-27), losing -24.88%. The number of shares
that changed hands was 18,047,233, or about 9 times the average daily
volume in the stock.
The closing price was $15.13, amounting to a market cap of $1,030,000,000,
about -57.86% off the highest price in the last 12 months. The stock has
been trading at a range between $14.83 and $35.9.
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 5.67 times earnings.