OppenheimerFunds' Small & Mid Cap Value Fund found itself in a tight spot when 15 percent annual returns over five years sent its assets soaring to $3 billion. Manager John Damian responded to this growth by expanding the fund's range of stock investments to companies with market values of $3 billion and over, but as Bloomberg reports, this move has put a damper on returns.

Oppenheimer's top small-cap stock fund came in third out of 114 similar products tracked by Bloomberg for five years, but over the last year it's ranked 39th. Nonetheless, Morningstar's observers are unruffled by the fund's adjustment pains, and with small company stocks underperforming over the last quarter, the move may prove well-timed.  

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