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

Esperion Therapeutics, Inc. (symbol: ESPR) was one of the worst losers of
the trading day today (2015-08-31), losing -8.68%. The number of shares
that changed hands was 1,532,057, or about 1 times the average daily volume
in the stock.
The closing price was $47.95, amounting to a market cap of $1,080,000,000,
about -60.36% off the highest price in the last 12 months. The stock has
been trading at a range between $15.0 and $120.96.
ESPR is in the Major Pharmaceuticals industry, part of the Health Care
sector. It first went public in 2013.