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

Thoratec Corporation (symbol: THOR) was one of the biggest winners of the
trading day today (2015-07-21), gaining 17.97%. The number of shares that
changed hands was 10,336,027, or about 20.0 times the average daily volume
in the stock.
The closing price was $57.58, amounting to a market cap of $3,120,000,000,
about -7.2% off the highest price in the last 12 months. The stock has been
trading at a range between $22.5 and $62.05.
THOR is in the Biotechnology: Electromedical & Electrotherapeutic Apparatus
industry, part of the Health Care sector.
Looking at its valuation, the stock is now trading at 74.97 times earnings.