The market share of Fidelity, Vanguard and American Funds in the mutual fund industry continues to expand, with the three giants’ market share now at 37.5%, up from 30% 10 years ago, according to Financial Research Corp.

Year to date through September, those three companies took in a third, or 33 cents, of every dollar invested in the 50 biggest fund companies. That’s up slightly from 31 cents of every dollar in 1997.

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