$ACHN is one of biggest winner #stocks today. read more:

Achillion Pharmaceuticals, Inc. (symbol: ACHN) was one of the biggest
winners of the trading day today (2016-12-23), gaining 9.77%. The number of
shares that changed hands was 2,533,586, or about 1.2 times the average
daily volume in the stock.
The closing price was $4.38, amounting to a market cap of $598,660,000,
about -60.0% off the highest price in the last 12 months. The stock has
been trading at a range between $3.78 and $10.95.
ACHN is in the Major Pharmaceuticals industry, part of the Health Care
sector. It first went public in 2006.