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

Accuray Incorporated (symbol: ARAY) was one of the worst losers of the
trading day today (2015-12-23), losing -5.53%. The number of shares that
changed hands was 893,348, or about 1 times the average daily volume in the
stock.
The closing price was $6.66, amounting to a market cap of $531,930,000,
about -33.47% off the highest price in the last 12 months. The stock has
been trading at a range between $4.8 and $10.01.
ARAY is in the Medical/Dental Instruments industry, part of the Health Care
sector. It first went public in 2007.