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

PROS Holdings, Inc. (symbol: PRO) was one of the biggest winners of the
trading day today (2015-12-28), gaining 3.77%. The number of shares that
changed hands was 441,168, or about 2.3 times the average daily volume in
the stock.
The closing price was $23.12, amounting to a market cap of $686,590,000,
about -19.27% off the highest price in the last 12 months. The stock has
been trading at a range between $15.92 and $28.64.
PRO is in the EDP Services industry, part of the Technology sector. It
first went public in 2007.