$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 (2015-10-02), gaining 17.03%. The number
of shares that changed hands was 2,555,891, or about 1.7 times the average
daily volume in the stock.
The closing price was $9.21, amounting to a market cap of $1,030,000,000,
about -33.45% off the highest price in the last 12 months. The stock has
been trading at a range between $7.36 and $13.84.
MACK is in the Major Pharmaceuticals industry, part of the Health Care
sector. It first went public in 2012.