Petrobras (PBR) shares rallied 5.3% in the last trading session to close at $13.51. This move can be attributable to notable volume with a higher number of shares being traded than in a typical session. This compares to the stock's 8.5% gain over the past four weeks.Petrobras’ shares moved higher after the company announced a $560 million contract to build LPG carriers, barges and pushboats at Brazilian shipyards, expanding Transpetro’s fleet and reducing dependence on chartered vessels. The deal is also ex ...