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

Western Digital Corporation (symbol: WDC) was one of the biggest winners of
the trading day today (2015-09-30), gaining 14.52%. The number of shares
that changed hands was 11,686,029, or about 4.3 times the average daily
volume in the stock.
The closing price was $79.44, amounting to a market cap of $18,300,000,000,
about -30.74% off the highest price in the last 12 months. The stock has
been trading at a range between $67.87 and $114.69.
WDC is in the Electronic Components industry, part of the Technology sector.
Looking at its valuation, the stock is now trading at 12.85 times earnings.