$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 (2015-07-24), losing -20.71%. The number of shares
that changed hands was 4,443,587, or about 5 times the average daily volume
in the stock.
The closing price was $75.91, amounting to a market cap of $1,700,000,000,
about -37.24% off the highest price in the last 12 months. The stock has
been trading at a range between $13.9 and $120.96.
ESPR is in the Major Pharmaceuticals industry, part of the Health Care
sector. It first went public in 2013.