The Galleon hedge fund at the centre of an insider trading scandal paid hundreds of millions of dollars a year to its Wall Street banks and in return regularly received market information that would not have been disclosed to most investors, executives familiar with the matter say.

A person familiar with Galleon, whose founder, Raj Rajaratnam, was charged with insider trading this month, said it paid about $250m to its banks last year. Executives who dealt with the fund said it paid more in fees and other charges during the boom years of this decade.