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

Merrimack Pharmaceuticals, Inc. (symbol: MACK) was one of the biggest
winners of the trading day today (2016-01-12), gaining 11.86%. The number
of shares that changed hands was 2,271,027, or about 1.6 times the average
daily volume in the stock.
The closing price was $6.51, amounting to a market cap of $752,390,000,
about -52.96% off the highest price in the last 12 months. The stock has
been trading at a range between $5.79 and $13.84.
MACK is in the Major Pharmaceuticals industry, part of the Health Care
sector. It first went public in 2012.