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

Petroleo Brasileiro S.A.- Petro (symbol: PBR) was one of the worst losers
of the trading day today (2016-04-04), losing -9.71%. The number of shares
that changed hands was 32,092,305, or about 1 times the average daily
volume in the stock.
The closing price was $5.3, amounting to a market cap of $34,570,000,000,
about -49.76% off the highest price in the last 12 months. The stock has
been trading at a range between $2.71 and $10.55.
PBR is in the Oil & Gas Production industry, part of the Energy sector.