Concerns about the business practices of Galleon hedge fund founder Raj Rajaratnam and his associates were raised inside JPMorgan Chase as far back as 2001, according to an internal company document seen by the Financial Times.

Mr Rajaratnam and five others – including former employees of Bear Stearns, now part of JPMorgan – were charged this month in an alleged insider trading scheme that US prosecutors called the biggest ever involving hedge funds.