(Bloomberg) -- Vanguard Group keeps getting more dominant.

The biggest U.S. mutual fund company attracted almost $29 billion to its long-term mutual funds and exchange-traded funds in March, more than all of its competitors combined, according to a report Thursday by Morningstar. Vanguard, which built its reputation on low fees, was the leader in estimated flows to both actively managed funds as well as those that track indexes, also its specialty.

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