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

Century Aluminum Company (symbol: CENX) was one of the worst losers of the
trading day today (2016-02-23), losing -15.51%. The number of shares that
changed hands was 6,189,220, or about 2 times the average daily volume in
the stock.
The closing price was $6.1, amounting to a market cap of $530,930,000,
about -72.88% off the highest price in the last 12 months. The stock has
been trading at a range between $2.63 and $22.49.
CENX is in the Aluminum industry, part of the Basic Industries sector. It
first went public in 1996.