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

Prothena Corporation plc (symbol: PRTA) was one of the biggest winners of
the trading day today (2016-02-19), gaining 8.87%. The number of shares
that changed hands was 1,340,880, or about 2.4 times the average daily
volume in the stock.
The closing price was $34.72, amounting to a market cap of $1,090,000,000,
about -54.57% off the highest price in the last 12 months. The stock has
been trading at a range between $24.92 and $76.42.
PRTA is in the Major Pharmaceuticals industry, part of the Health Care
sector.