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

TESARO, Inc. (symbol: TSRO) was one of the worst losers of the trading day
today (2015-09-28), losing -17.8%. The number of shares that changed hands
was 2,371,476, or about 5 times the average daily volume in the stock.
The closing price was $40.46, amounting to a market cap of $1,620,000,000,
about -39.57% off the highest price in the last 12 months. The stock has
been trading at a range between $23.0 and $66.95.
TSRO is in the Major Pharmaceuticals industry, part of the Health Care
sector. It first went public in 2012.