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

SunPower Corporation (symbol: SPWR) was one of the worst losers of the
trading day today (2016-12-28), losing -4.97%. The number of shares that
changed hands was 2,469,420, or about 1 times the average daily volume in
the stock.
The closing price was $6.88, amounting to a market cap of $952,320,000,
about -77.63% off the highest price in the last 12 months. The stock has
been trading at a range between $6.0 and $30.75.
SPWR is in the Semiconductors industry, part of the Technology sector. It
first went public in 2005.