The firm announced it had added Matlin Patterson, Marathon Asset Management and Manning & Napier to its list of clients, although it refused to give exact details of the mandates.
It has also been awarded $8.5bn (e6.9bn) in new business by Eaton Vance, Barclays Global Investors, Mass Mutual and Vega Asset Management.
Over the second quarter, the firm reported a 63 per cent increase in earnings and a 26 per cent increase in revenue.
Investors Bank & Trust announced that its total client assets stood at £1200bn (e1800bn) at the end of June.
Kevin Sheehan, chairman and CEO, said: “Our core and ancillary services continued to display impressive organic growth rates. Given these results, we are confident in our ability to grow our diluted earnings per share in excess of 30 per cent in 2004.”
