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Closed Fund

Effective March 4, 2013, the Zero Coupon 2015 Fund is closed to all investments, except reinvested distributions and capital gains distributions.

Seeks the highest return consistent with investment in U.S. Treasury securities.

/sd/customer/portfolio_json 1.800.345.2021
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Data reflects past performance for Investor Class shares, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value fluctuates. Redemption value may be more or less than original cost. Obtain performance data current to the most recent month end. For additional share class information, consult the prospectus.

The fund invests primarily in zero-coupon U.S. Treasury securities and their equivalents, which can be subject to dramatic price fluctuations and could result in significant gains or losses if sold prior to maturity. Each Zero Coupon fund invests in different maturities of these debt securities and has different interest rate risks. The fund can only offer a relatively predictable return if held to maturity. Investment in zero-coupon securities is subject to greater price risk than interest-paying securities of similar maturity.

W2 If your account falls below the minimum balance, you will be notified and given 90 days to meet the minimum. If the deadline is not met, American Century Investments may redeem the shares in the account and send the proceeds to the address of record.

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Expense ratios provided are the funds' total annual operating expense ratios, gross of any fee waivers or expense reimbursements. Expense ratios are as of the funds' most current prospectus.

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Distribution