$ATRC is one of biggest losers #stocks today. read more:

AtriCure, Inc. (symbol: ATRC) was one of the worst losers of the trading
day today (2015-09-22), losing -10.15%. The number of shares that changed
hands was 477,472, or about 3 times the average daily volume in the stock.
The closing price was $23.38, amounting to a market cap of $667,200,000,
about -16.94% off the highest price in the last 12 months. The stock has
been trading at a range between $13.19 and $28.15.
ATRC is in the Medical/Dental Instruments industry, part of the Health Care
sector. It first went public in 2005.