Stuart Wall, who owned student housing company Opal Property Group, alleged that RBS interest rate swaps mis-selling contributed to the collapse of his business.
CityAm reports that he was suing the bank for between £114m and £669m, with the case due to come to court in October.
An RBS spokesperson said: “The action has been settled without any admission of liability by the bank. The terms of the settlement are confidential.”
In 2013, RBS was fined around £390m by authorities from the UK, the Financial Conduct Authority, and the US for its part in the Libor-rigging scandal.
