Fidelity. Vanguard. JPMorgan. The names of such leading financial companies evoke security and trust. But bigger financial firms don't always mean better performance, according to a study by T. Rowe Price. The study looked at the collective performance of each fund complex's offerings over one, three, five and 10 years ending March 31.

Seventy-nine percent of T. Rowe Price's funds outperformed their peers over the past one and three years, 77% bested their peers over the past five years, and 74% over the past decade.

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