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

athenahealth, Inc. (symbol: ATHN) was one of the biggest winners of the
trading day today (2016-12-15), gaining 22.83%. The number of shares that
changed hands was 3,287,445, or about 5.3 times the average daily volume in
the stock.
The closing price was $115.91, amounting to a market cap of $4,570,000,000,
about -30.78% off the highest price in the last 12 months. The stock has
been trading at a range between $90.11 and $167.46.
ATHN is in the Business Services industry, part of the Miscellaneous
sector. It first went public in 2007.
Looking at its valuation, the stock is now trading at 247.14 times earnings.