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

Pacific Biosciences of Californ (symbol: PACB) was one of the worst losers
of the trading day today (2015-10-26), losing -10.74%. The number of shares
that changed hands was 4,098,738, or about 2 times the average daily volume
in the stock.
The closing price was $6.98, amounting to a market cap of $528,420,000,
about -20.5% off the highest price in the last 12 months. The stock has
been trading at a range between $3.58 and $8.78.
PACB is in the Biotechnology: Laboratory Analytical Instruments industry,
part of the Capital Goods sector. It first went public in 2010.