The US Financial Industry Regulatory Authority (FINRA) alleges the banks offered a favourable rating to the US toy retailer in return for being employed on its 2010 stock offering.
The banks include Citigroup, Goldman Sachs, JP Morgan, Credit Suisse and Barclays.
They were fined a total of $43.5m.
via BBC News – Banks fined by US regulators over Toys R Us research.