Charles Schwab Corp. of San Francisco has just re-launched a large-cap mutual fund using a proprietary equity research system.

The Schwab Core Equity Fund is the firm's first investment product to use new ratings software that grades stocks A through F. Although the fund will be actively managed by two portfolio managers, they will base their selections on the Schwab Equity Ratings system that the firm created for its clients in May. The system examines 3,500 U.S. stocks and grades them between A and F based on a number of factors including industry exposure and risk management.

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