Ameriprise Financial's largest mutual fund, the $8.5 billion RiverSource New Dimensions Fund, suffered withdrawals of $5.9 billion last year, and so the firm has decided to merge the fund with a smaller and younger fund, the RiverSource Large-Cap Equity Fund, to end withdrawals and improve performance, according to St. Paul Pioneer Press.

The smaller, four-year-old fund was ranked in the top third of its peer funds last year, and 38-year-old New Dimensions was at the bottom.

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