Mutual fund portfolio managers might want to think twice before investing in shares of NYSE Group, which began trading Wednesday, MarketWatch reports. The Securities and Exchange Commission might require funds that own 5% or more of the stock to get its approval before sending trades to the Big Board.

The reason is the SEC might view it as a conflict of interest. If a fund company owns a trading system, it might be influenced to send its trades there to help boost its business, explained shareholder advocate Mercer Bullard.

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