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

Zillow Group, Inc. (symbol: Z) was one of the biggest winners of the
trading day today (2016-05-04), gaining 12.05%. The number of shares that
changed hands was 8,376,262, or about 4.8 times the average daily volume in
the stock.
The closing price was $28.08, amounting to a market cap of $5,010,000,000,
about -16.48% off the highest price in the last 12 months. The stock has
been trading at a range between $15.36 and $33.62.
Z is in the Business Services industry, part of the Miscellaneous sector.
It first went public in 2011.