$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 (2016-09-23), gaining 21.13%. The number of shares that changed
hands was 6,061,292, or about 8.5 times the average daily volume in the
stock.
The closing price was $52.56, amounting to a market cap of $1,710,000,000,
about -32.61% off the highest price in the last 12 months. The stock has
been trading at a range between $31.11 and $77.99.
IMPV is in the Computer Software: Prepackaged Software industry, part of
the Technology sector. It first went public in 2011.