Bisys Group Inc., the top administrator of bank-managed mutual funds, has widened its lead over a shrinking field of rivals, according to data from Lipper Analytical Services, Summit, N.J.

In the quarter ended June 30, Bisys handled $82.9 billion in fund assets for its bank clients, up 51% from a year earlier. That's twice as much as second-place First Data Investor Services, which administered $40.9 billion, down 6% in a year.

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