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

Groupon, Inc. (symbol: GRPN) was one of the biggest winners of the trading
day today (2016-07-28), gaining 28.84%. The number of shares that changed
hands was 65,520,499, or about 8.6 times the average daily volume in the
stock.
The closing price was $4.87, amounting to a market cap of $2,820,000,000,
about -7.77% off the highest price in the last 12 months. The stock has
been trading at a range between $2.15 and $5.28.
GRPN is in the Advertising industry, part of the Technology sector. It
first went public in 2011.