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

Collegium Pharmaceutical, Inc. (symbol: COLL) was one of the biggest
winners of the trading day today (2015-12-30), gaining 13.11%. The number
of shares that changed hands was 289,732, or about 2.1 times the average
daily volume in the stock.
The closing price was $28.74, amounting to a market cap of $594,570,000,
about -6.02% off the highest price in the last 12 months. The stock has
been trading at a range between $11.92 and $30.58.
COLL is in the Major Pharmaceuticals industry, part of the Health Care
sector. It first went public in 2015.