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

Regeneron Pharmaceuticals, Inc. (symbol: REGN) was one of the biggest
winners of the trading day today (2016-04-01), gaining 12.43%. The number
of shares that changed hands was 3,182,867, or about 3.2 times the average
daily volume in the stock.
The closing price was $405.25, amounting to a market cap of
$42,190,000,000, about -33.12% off the highest price in the last 12 months.
The stock has been trading at a range between $348.96 and $605.93.
REGN is in the Major Pharmaceuticals industry, part of the Health Care
sector. It first went public in 1991.
Looking at its valuation, the stock is now trading at 73.41 times earnings.