Morgan Stanley has been appointed to lead a likely record-breaking share sale from Brazilian oil company Petrobras, two months after it landed a role on the giant initial public offering of Agricultural Bank of China. The deals could potentially lift the US bank into the top three in the global bookrunning rankings.

Morgan Stanley is among three US banks that have been appointed to lead a share sale from Petrobras, the Brazilian oil company, which could potentially become the largest ever equity offer on record.