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

Companhia Siderurgica Nacional (symbol: SID) was one of the worst losers of
the trading day today (2015-09-23), losing -20.744%. The number of shares
that changed hands was 2,182,326, or about 1 times the average daily volume
in the stock.
The closing price was $0.9907, amounting to a market cap of $1,340,000,000,
about -76.0121% off the highest price in the last 12 months. The stock has
been trading at a range between $0.73 and $4.13.
SID is in the Steel/Iron Ore industry, part of the Capital Goods sector.