Aside from adopting hedge-like strategies to give retail investors a taste of the high-priced spread, mutual funds are following their well-heeled cousins in another way: They're closing their doors to new investors when they feel they're getting too big. That assessment comes from London-based F&C Asset Management, which notes that firms such as Framlington Equity Income and J.O. Hambro U.K. Growth have done just that, to preserve a high level of performance. F&C fund manager Tom Caddick, according to Reuters, says it appears that mutual funds are becoming "increasingly concerned about performance rather than chasing asset growth." What this means for investors, he suggests, is that they can no longer rely on a large window of opportunity and need to spot strong performers before the door shuts.