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

ON Semiconductor Corporation (symbol: ON) was one of the worst losers of
the trading day today (2015-11-18), losing -7.91%. The number of shares
that changed hands was 29,347,330, or about 6 times the average daily
volume in the stock.
The closing price was $9.89, amounting to a market cap of $4,080,000,000,
about -26.74% off the highest price in the last 12 months. The stock has
been trading at a range between $8.0 and $13.5.
ON is in the Semiconductors industry, part of the Technology sector.
Looking at its valuation, the stock is now trading at 28.5 times earnings.