Reuters reports industry watchdogs are targeting these areas because they are highly lucrative but have remained out of sight from other similar platforms.
In addition, investigators are to also focus on the practice of computerised trading, which is often cited as the cause of considerable market swings.
According to the news agency, lenders such as UBS, HSBC, Barclays, Credit Suisse and Deutsche Bank - which has been in operation since 1870 following licensing from the Prussian government - are able to make investment banking revenues of between 40 and 60 per cent due to the trading floors of fixed income, commodities and currencies alone.
One industry insider noted: "Everyone is in deep analysis and is having to revisit that analysis with each iteration of the leaked documents ... we have to make a prioritised list."
By Tony Aynsley