A new rankings system for mutual funds has elevated lesser-known portfolio managers ahead of bond guru Bill Gross and legendary stock picker Mario Gabelli, The Wall Street Journal reports.

The new system, called "The Ranking Service," is unique in that it is one of the first to measure individual portfolio managers rather than the performance of their funds. It covers 3,341 managers. This could be a valuable new tool for investors trying to determine which funds they want use for their retirement savings.

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