$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 (2016-03-01), gaining 12.61%. The number
of shares that changed hands was 3,809,247, or about 2.5 times the average
daily volume in the stock.
The closing price was $6.52, amounting to a market cap of $753,540,000,
about -52.89% off the highest price in the last 12 months. The stock has
been trading at a range between $5.02 and $13.84.
MACK is in the Major Pharmaceuticals industry, part of the Health Care
sector. It first went public in 2012.