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

/sd/customer/portfolio_json 1.800.345.2021

Goal and Strategy

Highest return consistent with investments in U.S. Treasury securities.

Distinguishing Characteristics

Invests in zero-coupon bonds, providing a dependable rate of return if held to maturity.

A Note About Risk

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 (2015). 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 (2015). Investment in zero coupon securities is subject to greater price risk than interest-paying securities of similar maturity. There is no guarantee that the investment objectives will be met. Dividends and yields represent past performance and there is no guarantee that they will continue to be paid.

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Rating & Rankings

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For each fund with at least a three-year history, Morningstar calculates a Morningstar RatingTM based on a Morningstar Risk-Adjusted Return measure that accounts for variation in a fund's monthly performance (including the effects of sales charges, loads and redemption fees), placing more emphasis on downward variations and rewarding consistent performance. Morningstar ratings are based upon Investor class of shares, unless otherwise indicated. The top 10% of funds in each category receive 5 stars, the next 22.5% receive 4 stars, the next 35% receive 3 stars, the next 22.5% receive 2 stars and the bottom 10% receive 1 star. (Each share class is counted as a fraction of one fund within this scale and rated separately, which may cause slight variations in the distribution percentages.) The Overall Morningstar RatingTM for a fund is derived from a weighted average of the performance figures associated with its three-, five- and ten-year (if applicable) Morningstar RatingTM metrics. Past performance is no guarantee of future results.

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Fund Management

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.

Lipper rankings are based on average annual total returns. Portions of the mutual fund performance information contained on this page were supplied by Lipper, a Reuters Company, subject to the following: Copyright 2015 © Reuters. All rights reserved. Any copying, republication or redistribution of Lipper content, including by caching, framing or similar means, is expressly prohibited without the prior written consent of Lipper. Lipper shall not be liable for any errors or delays in the content, or for any actions taken in reliance thereon. Performance data is preliminary and subject to revision. Rankings are based on all classes available within the classification as of the date shown. Rankings are based only on the universe shown.

©2015 Morningstar, Inc. All Rights Reserved. Certain information contained herein: (1) is proprietary to Morningstar and/or its content providers; (2) may not be copied or distributed; and (3) is not warranted to be accurate, complete or timely. Neither Morningstar nor its content providers are responsible for any damages or losses arising from any use of this information.

Quick Facts

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Distribution