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

Gerdau S.A. Common Stock (symbol: GGB) was one of the worst losers of the
trading day today (2016-08-22), losing -5.73%. The number of shares that
changed hands was 12,602,700, or about 1 times the average daily volume in
the stock.
The closing price was $2.96, amounting to a market cap of $5,080,000,000,
about -7.21% off the highest price in the last 12 months. The stock has
been trading at a range between $0.79 and $3.19.
GGB is in the Steel/Iron Ore industry, part of the Capital Goods sector.