American Century Investments of Kansas City, Mo., has enhanced its quarterly customer account statements to reflect individual rates of return in each customer's personal portfolio, as opposed to providing performance figures for each fund in its family. For instance, if a particular fund has increased 12 percent in the quarter but represents only 15 percent of the investor's portfolio, the statement indicates that fund's contribution to the investor's portfolio is 0.8 percent (15 percent of 12 percent.)

American Century also calculates an investor's rate of return by factoring in additional investments and redemptions, cash distributions and exchanges between funds.

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