$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 (2015-12-28), gaining 4.8%. The number of
shares that changed hands was 110,562, or about 0.8 times the average daily
volume in the stock.
The closing price was $26.21, amounting to a market cap of $542,230,000,
about -8.04% off the highest price in the last 12 months. The stock has
been trading at a range between $11.92 and $28.5.
COLL is in the Major Pharmaceuticals industry, part of the Health Care
sector. It first went public in 2015.