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

Imperva, Inc. (symbol: IMPV) was one of the biggest winners of the trading
day today (2015-10-30), gaining 16.13%. The number of shares that changed
hands was 2,337,668, or about 4.0 times the average daily volume in the
stock.
The closing price was $70.62, amounting to a market cap of $2,210,000,000,
about -4.57% off the highest price in the last 12 months. The stock has
been trading at a range between $36.5 and $74.0.
IMPV is in the Computer Software: Prepackaged Software industry, part of
the Technology sector. It first went public in 2011.