AMERICAN CENTURY INTERNATIONAL BOND FUNDS (Form: 485BPOS, Received: 02/26/2021 13:42:32)

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As Filed with the U.S. Securities and Exchange Commission on February 26, 2021

1933 Act File No. 033-43321

1940 Act File No. 811-06441


UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549
__________________
FORM N-1A
__________________

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933			x

Pre-Effective Amendment No.			☐

Post-Effective Amendment No. 64			x

and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940			x

Amendment No. 65			x
(Check appropriate box or boxes.)
__________________
American Century International Bond Funds (Exact Name of Registrant as Specified in Charter)
__________________
4500 MAIN STREET, KANSAS CITY, MISSOURI 64111 (Address of Principal Executive Offices)(Zip Code)
REGISTRANT’S TELEPHONE NUMBER, INCLUDING AREA CODE: (816) 531-5575
CHARLES A. ETHERINGTON 4500 MAIN STREET, KANSAS CITY, MISSOURI 64111 (Name and Address of Agent for Service)
Approximate Date of Proposed Public Offering: March 1, 2021

It is proposed that this filing will become effective (check appropriate box)


☐			immediately upon filing pursuant to paragraph (b)
x			on March 1, 2021, at 8:30 a.m. (Central) pursuant to paragraph (b)
☐			60 days after filing pursuant to paragraph (a)(1)
☐			on (date) pursuant to paragraph (a)(1)
☐			75 days after filing pursuant to paragraph (a)(2)
☐			on (date) pursuant to paragraph (a)(2) of rule 485

If appropriate, check the following box:
☐			this post-effective amendment designates a new effective date for a previously filed post-effective amendment.

March 1, 2021

American Century Investments

Prospectus

Emerging Markets Debt Fund

Investor Class (AEDVX)

I Class (AEHDX)

Y Class (AEYDX)

A Class (AEDQX)

C Class (AEDHX)

R Class (AEDWX)

R5 Class (AEDJX)

R6 Class (AEXDX)

G Class (AEDGX)


The Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

Table of Contents


Fund Summary			2
Investment Objective			2
Fees and Expenses			2
Principal Investment Strategies			3
Principal Risks			4
Fund Performance			5
Portfolio Management			6
Purchase and Sale of Fund Shares			6
Tax Information			7
Payments to Broker-Dealers and Other Financial Intermediaries			7
Objectives, Strategies and Risks			8
Management			12
Investing Directly with American Century Investments			14
Investing Through a Financial Intermediary			16
Additional Policies Affecting Your Investment			21
Share Price and Distributions			26
Taxes			28
Multiple Class Information			30
Financial Highlights			31

Appendix A			A-1

Fund Summary

Investment Objective

The fund seeks total return.

Fees and Expenses

The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Century Investments funds. More information about these and other discounts is available from your financial professional and in Calculation of Sales Charges on page 17 of the fund’s prospectus, Appendix A of the fund’s prospectus and Sales Charges in Appendix B of the statement of additional information.

Shareholder Fees (fees paid directly from your investment)

Investor

Maximum Sales Charge (Load) Imposed on
Purchases (as a percentage of offering price)

None

4.50%

None

Maximum Deferred Sales Charge (Load) (as a
percentage of the lower of the original offering
price or redemption proceeds when redeemed
within one year of purchase)

None

None¹

1.00%

None

Maximum Annual Account Maintenance Fee
(waived if eligible investments total at least $10,000)

$25

None


Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
	Investor	I	Y	A	C	R	R5	R6	G
Management Fee	0.96%	0.86%	0.76%	0.96%	0.96%	0.96%	0.76%	0.71%	0.71%
Distribution and Service (12b-1) Fees	None	None	None	0.25%	1.00%	0.50%	None	None	None
Other Expenses	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%
Acquired Fund Fees and Expenses	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%
Total Annual Fund Operating Expenses	0.98%	0.88%	0.78%	1.23%	1.98%	1.48%	0.78%	0.73%	0.73%
Fee Waiver	None	None	None	None	None	None	None	None	0.71%²
Total Annual Fund Operating Expenses After Fee Waiver	0.98%	0.88%	0.78%	1.23%	1.98%	1.48%	0.78%	0.73%	0.02%

1 Purchases of $1 million or more may be subject to a contingent deferred sales charge of 1.00% if the shares are redeemed within one year of the date of purchase.

2 The advisor has agreed to waive the G Class’s management fee in its entirety. The advisor expects this waiver to remain in effect permanently and cannot terminate it without the approval of the Board of Trustees.

Example

The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods and that you earn a 5% return each year. The example also assumes that the fund’s operating expenses remain the same, except that it reflects the rate and duration of any fee waivers noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:


	1 year	3 years	5 years	10 years
Investor Class	$100	$313	$542	$1,201
I Class	$90	$281	$488	$1,085
Y Class	$80	$250	$434	$966
A Class	$570	$823	$1,096	$1,871
C Class	$201	$622	$1,068	$2,110
R Class	$151	$469	$809	$1,767
R5 Class	$80	$250	$434	$966
R6 Class	$75	$234	$407	$907
G Class	$2	$6	$11	$26

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 68% of the average value of its portfolio.

Principal Investment Strategies

Under normal market conditions, the fund invests at least 80% of its net assets in fixed income instruments of issuers that are economically tied to emerging markets. The fund will invest in debt instruments issued by foreign governments and corporations. Investments will typically be made in U.S. dollar denominated instruments, but may be denominated in local emerging markets currency as well.

The fund considers an emerging market to be any country that is located outside the following developed countries list, which is subject to change: Australia, Austria, Belgium, Bermuda, Canada, Denmark, Finland, France, Germany, Ireland, Italy, Japan, Luxembourg, the Netherlands, New Zealand, Norway, Portugal, Spain, Sweden, Switzerland, the United Kingdom and the United States. In determining an issuer’s location, the portfolio managers may consider various factors including, among others, where the issuer is headquartered, where the issuer’s principal operations are located, where the issuer’s revenues are derived, where the principal trading market is located and the country in which the issuer was legally organized. The weight given to each of these factors will vary depending on the circumstances in a given case.

The fund may invest without limitation in both investment grade and high-yield (“junk bonds”) debt securities. An “investment grade” security is one that has been rated in one of the four highest categories used by a nationally recognized statistical rating organization or determined by the investment advisor to be of comparable credit quality. A “high-yield” security is one that has been rated below the four highest categories used by a nationally recognized statistical rating organization, or determined by the investment advisor to be of similar quality.

The average duration of the fund varies based on the portfolio managers’ forecast of interest rates and, under normal market conditions is not expected to exceed ten years. Duration is an indication of the relative sensitivity of a security’s market value to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates. Duration is different from maturity in that it attempts to measure the interest rate sensitivity of a security, as opposed to its expected final maturity.

In addition to the debt securities described above, the fund may also invest in bank loans.

The fund also invests in derivative instruments. The fund may use foreign currency exchange contracts to shift its investment exposure from one currency into another, for hedging purposes or to enhance returns. The fund may invest in futures contracts, options and swap agreements to manage duration, credit exposure and country exposure. The fund may also invest in collateralized debt obligations, including collateralized loan obligations, mortgage- or asset-backed securities and other similarly structured investments.

The portfolio managers may engage in hedging of portfolio positions, which usually involves entering into a derivative transaction that has the opposite characteristics of the position being hedged. The net effect of these two positions is to reduce or eliminate the exposure created by the first position.

To determine whether to buy or sell a security, the portfolio managers consider, among other things, various fund requirements and standards, along with economic conditions, alternative investments, interest rates and whether to alter geographic or currency exposure.

Principal Risks

•Foreign Securities Risk – The fund may invest in foreign securities, which are generally riskier than U.S. securities. As a result the fund may be subject to foreign risk, meaning that political events (such as civil unrest, national elections and imposition of exchange controls), social and economic events (such as labor strikes and rising inflation), natural disasters and public health emergencies occurring in a country where the fund invests could cause the fund’s investments in that country to experience losses. For these and other reasons, securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

•Emerging Market Risk – Investing in securities of issuers located in emerging market countries generally is riskier than investing in securities of issuers located in foreign developed countries. Emerging market countries may have unstable governments and/or economies that are subject to sudden change. These changes may be magnified by the countries’ emergent financial markets, resulting in significant volatility to investments in these countries. These countries also may lack the legal, business and social framework to support securities markets.

•Currency Risk – Because the fund may invest in securities denominated in foreign currencies, the fund may be subject to currency risk, meaning that the fund could experience gains or losses based solely on changes in the exchange rate between foreign currencies and the U.S. dollar.

•Credit Risk – Debt securities, especially high-yield debt securities, are subject to credit risk. Credit risk is the risk that the inability or perceived inability of the issuer to make interest and principal payments will cause the value of the securities to decrease. As a result the fund’s share price could also decrease. Changes in the credit rating of a debt security held by the fund could have a similar effect.

•High-Yield Securities Risk – Issuers of high-yield securities are more vulnerable to real or perceived economic changes (such as an economic down turn or a prolonged period of rising interest rates), political changes or adverse developments specific to an issuer. These factors may be more likely to cause an issuer of low quality bonds to default on its obligations.

•Interest Rate Risk – Investments in debt securities are sensitive to interest rate changes. Generally, the value of debt securities and the funds that hold them decline as interest rates rise. The fund’s investments are designed to reduce this risk. Interest rate risk, however, is generally higher for the fund than for funds that have a shorter-weighted average maturity, such as money market funds and short-term bond funds. The fund will also be exposed to interest rate risk outside of the U.S. where interest rate trends may differ from those in the U.S. A period of rising interest rates may negatively affect the fund’s performance.

•Liquidity Risk – The fund may also be subject to liquidity risk. During periods of market turbulence or unusually low trading activity, in order to meet redemptions it may be necessary for the fund to sell securities at prices that could have an adverse effect on the fund’s price. Changing regulatory and market conditions, including increases in interest rates and credit spreads, may adversely affect the liquidity of the fund’s investments. In addition, when the market for certain investments is illiquid, the fund may be unable to achieve its desired level of exposure to a certain sector. Illiquid securities may also be difficult to value.

•Sovereign Debt Risk – Sovereign debt instruments, which are instruments issued by foreign governmental entities, are subject to the risk that the governmental entity may be unable or unwilling to repay the principal or interest on its sovereign debt due to, among other reasons, cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of the governmental entity’s debt or its failure to implement economic reforms. There is no bankruptcy process for collecting sovereign debt and legal remedies may be limited and onerous to pursue.

•Single Country Risk – Investing a significant portion of assets in one country or region makes the fund more dependent upon the political and economic circumstances of that particular country or region than a fund that is more widely diversified.

•Counterparty Risk – If the fund enters into financial contracts, the fund will be subject to the credit risk presented by the counterparties.

•Derivatives Risk – The use of derivative instruments, such as futures, options and swaps, involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional instruments. Derivatives are subject to a number of risks, including leverage, liquidity, interest rate, market, credit, counterparty and correlation risk. Derivatives can be highly illiquid and difficult to unwind or value, and changes in the value of a derivative held by the fund may not correlate with the value of the underlying instrument or the fund’s other investments. Gains or losses involving some futures, options and other derivatives may be substantial – in part because a relatively small price movement in these instruments may result in an immediate and substantial gain or loss for the fund.

•Bank Loan Risk – The market for bank loans may not be highly liquid and the fund may have difficulty selling them. In connection with purchasing loan participations, the fund generally will have no right to enforce compliance by borrowers with loan terms nor any set off rights, and the fund may not benefit directly from any posted collateral. As a result, the fund may be subject to the credit risk of both the borrower and the lender selling the participation. Bank loan transactions may take more than seven days to settle, meaning that proceeds would be unavailable to make additional investments or meet redemptions.

•Collateralized Debt Obligations/Collateralized Loan Obligation Risk – Collateralized debt obligations and collateralized loan obligations (CLOs) are subject to credit, interest rate, valuation, and prepayment and extension risks. These securities also are subject to risk of default on the underlying asset, particularly during periods of economic downturn. The market value of CLOs may be affected by, among other things, changes in the market value of the underlying assets held by the CLO, changes in the distributions on the underlying assets, defaults and recoveries on the underlying assets, capital gains and losses on the underlying assets, prepayments on underlying assets and the availability, prices and interest rate of underlying assets.

•Redemption Risk – The fund may need to sell securities at times it would not otherwise do so in order to meet shareholder redemption requests. Selling securities to meet such redemptions may cause the fund to experience a loss, increase the fund’s transaction costs or have tax consequences. To the extent that a large shareholder (including a fund of funds or 529 college savings plan) invests in the fund, the fund may experience relatively large redemptions as such shareholder reallocates its assets.

•Market Risk – The risk that the value of securities owned by the fund may go up and down, sometimes rapidly or unpredictably. Market risks, including political, regulatory, economic and social developments, can affect the value of the fund’s investments. Natural disasters, public health emergencies, terrorism and other unforeseeable events may lead to increased market volatility and may have adverse long-term effects on world economies and markets generally.

•Public Health Emergency Risk – A pandemic, caused by the infectious respiratory illness COVID-19, is causing market disruption and other economic impacts. Markets have experienced volatility, reduced liquidity, and increased trading costs. These events may continue to impact the fund and its underlying investments.

•Principal Loss Risk – At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Fund Performance

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund’s performance from year to year for Investor Class shares. The table shows how the fund’s average annual returns for the periods shown compared with those of a broad measure of market performance. The fund’s past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, including yields, please visit americancentury.com.

Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown.

Calendar Year Total Returns

Highest Performance Quarter (2Q 2020): 12.41% Lowest Performance Quarter (1Q 2020): -12.98%


Average Annual Total Returns For the calendar year ended December 31, 2020	1 year	5 year	Since Inception	Inception Date
Investor Class Return Before Taxes	6.53%	6.43%	4.98%	07/29/2014
Return After Taxes on Distributions	4.98%	4.77%	3.38%	07/29/2014
Return After Taxes on Distributions and Sale of Fund Shares	3.80%	4.21%	3.10%	07/29/2014
I Class1 Return Before Taxes	6.64%	6.52%	5.08%	04/10/2017
Y Class1 Return Before Taxes	6.74%	6.62%	5.19%	04/10/2017
A Class Return Before Taxes	1.44%	5.18%	3.97%	07/29/2014
C Class Return Before Taxes	5.48%	5.37%	3.94%	07/29/2014
R Class Return Before Taxes	6.01%	5.91%	4.47%	07/29/2014
R5 Class Return Before Taxes	6.75%	6.64%	5.20%	07/29/2014
R6 Class Return Before Taxes	6.80%	6.68%	5.25%	07/29/2014
G Class Return Before Taxes	7.56%	—	6.17%	11/14/2017
JPMorgan Corporate Emerging Market Bond (CEMBI) Broad Diversified Index (reflects no deduction for fees, expenses or taxes)	7.13%	7.11%	5.47%	07/29/2014

1 Historical performance for the I and Y Classes prior to their inception is based on the performance of R5 Class shares. I and Y Class performance has been adjusted to reflect differences in expenses between classes, if applicable. Since inception performance for the I and Y Classes is based on the R5 Class inception date.

The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

Portfolio Management

Investment Advisor

American Century Investment Management, Inc.

Portfolio Managers

John A. Lovito, Senior Vice President and Senior Portfolio Manager, has served on teams managing fixed-income investments for American Century Investments since joining the advisor in 2009.

Brian Howell, Vice President and Senior Portfolio Manager, has served on teams managing fixed-income investments for American Century Investments since joining the advisor in 1987.

Thomas Youn, Portfolio Manager and Senior Corporate Analyst, has served on teams managing fixed-income investments for American Century Investments since joining the advisor in 2014.

Alessandra Alecci, Vice President, Portfolio Manager and Senior Sovereign Analyst, has served on teams managing fixed-income investments for American Century Investments since joining the advisor in 2015.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of the fund on any business day through our website at americancentury.com, in person (at one of our Investor Centers), by mail (American Century Investments, P.O. Box 419200, Kansas City, MO 64141-6200), by telephone at 1-800-345-2021 (Investor Services Representative) or 1-800-345-3533 (Business, Not-For-Profit and Employer-Sponsored Retirement Plans), or through a financial intermediary. Shares may be purchased and redemption proceeds received by electronic bank transfer, by check or by wire.

Investors opening accounts through financial intermediaries may open an account with $250 for the Investor, A, C and R Classes, but the financial intermediaries may require their clients to meet different investment minimums. The minimum may be waived for broker-dealer sponsored wrap program accounts, fee based accounts, and accounts through bank/trust and wealth management advisory organizations.

The minimum initial investment amount for the I Class is generally $5 million ($3 million for endowments and foundations), but the minimum may be waived if you have an aggregate investment in the American Century family of funds of $10 million or more ($5 million for endowments and foundations). This includes accounts held directly with American Century and those held through a financial intermediary.

There is no minimum initial investment amount for Y, R5 or R6 Class shares.

For the Investor, A, C, R, R5 and R6 Classes, there is no minimum initial investment amount for certain employer-sponsored retirement plans, however, financial intermediaries or plan recordkeepers may require plans to meet different minimums. Employer-sponsored retirement plans are not eligible to purchase I or Y Class shares.

There is a $50 minimum for subsequent purchases, except that there is no subsequent purchase minimum for financial intermediaries or employer-sponsored retirement plans.

G Class shares are available for purchase only by funds advised by American Century Investments and other American Century advisory clients that are subject to a contractual fee for investment management services. G Class shares do not have a minimum purchase amount.

Tax Information

Fund distributions are generally taxable as ordinary income or capital gains, unless you are investing through a tax-deferred account such as a 401(k) or individual retirement account (in which case you may be taxed upon withdrawal of your investment from such account).

Payments to Broker-Dealers and Other Financial Intermediaries

If you purchase the fund through a broker-dealer or other financial intermediary (such as a bank, insurance company, plan sponsor or financial professional), the fund and its related companies may pay the intermediary for the sale of fund shares and related services for investments in all classes except the Y, R6 and G Classes. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the fund over another investment. Ask your salesperson or visit your financial intermediary’s website for more information.

Objectives, Strategies and Risks

What is the fund’s investment objective?

The fund seeks total return.

The fund’s investment objective is a nonfundamental investment policy and may be changed by the Board of Trustees without shareholder approval upon 60 days’ notice to shareholders.

What are the fund’s principal investment strategies?

Under normal market conditions, the fund invests at least 80% of its net assets in fixed income instruments of issuers that are economically tied to emerging markets. The fund will invest in debt instruments issued by foreign governments (including their agencies, authorities, instrumentalities and political subdivisions) and corporations. Investments will typically be made in U.S. dollar denominated instruments, but may be denominated in local emerging markets currency as well.

The fund may invest in both investment grade and high-yield (“junk bonds”) debt securities without limitation. An “investment grade” security is one that has been rated in one of the four highest categories used by a nationally recognized statistical rating organization or determined by the investment advisor to be of comparable credit quality. A “high-yield” security is one that has been rated below the four highest categories used by a nationally recognized statistical rating organization, or determined by the investment advisor to be of similar quality.

The weighted average duration of the fund’s portfolio is not expected to exceed ten years. Duration, which is an indication of the relative sensitivity of a security’s market value to changes in interest rates, is based upon the aggregate of the present value of all principal and interest payments to be received, discounted at the current market rate of interest and expressed in years. The longer the weighted average duration of the fund’s portfolio, the more sensitive its market value is to interest rate fluctuations. For example, if the weighted average duration of the fund’s portfolio is two years, a 2% change in the value of the fund’s portfolio would be expected for every 1% change in interest rates.

In addition to the debt securities described above, the fund may also invest in bank loans.

The fund also invests in derivative instruments. The fund may invest in foreign currency exchange contracts to shift its investment exposure from one currency into another, for hedging purposes or to enhance returns. The fund may invest in futures contracts, options and swap agreements to manage duration, credit exposure and country exposure. The fund may invest in collateralized debt obligations, including collateralized loan obligations, mortgage- or asset-backed securities and other similarly structured investments.

In the event of exceptional market or economic conditions, the fund may take temporary defensive positions that are inconsistent with the fund’s principal investment strategies. To the extent the fund assumes a defensive position, it may not achieve its investment objective.

The portfolio managers decide which debt securities to buy and sell by, among other things,

•identifying debt securities that satisfy the fund’s credit quality standards

•determining whether to alter the fund’s geographic or currency exposure

•determining which debt securities help the fund meet its maturity requirements

•assessing current and anticipated interest rates

•evaluating current economic conditions and the risk of inflation

•evaluating special features of the debt securities that may make them more or less attractive to alternatives

A description of the policies and procedures with respect to the disclosure of the fund’s portfolio securities is available in the statement of additional information.

What are the principal risks of investing in the fund?

The fund may invest in foreign securities, which are generally riskier than U.S. securities. As a result, the fund may be subject to foreign risk, meaning that political events (such as civil unrest, national elections and imposition of exchange controls), social and economic events (such as labor strikes and rising inflation), and natural disasters occurring in a country where the fund invests could cause the fund’s investments in that country to experience losses. In addition, foreign securities can have reduced availability of public information, and the lack of uniform financial reporting and regulatory practices similar to those that apply to U.S. issuers. For these and other reasons, securities of foreign companies are often more volatile, less liquid and harder to value than those of U.S. issuers.

Investing in securities of issuers located in emerging market countries generally is also riskier than investing in securities of issuers located in foreign developed countries. Emerging market countries may have unstable governments and/or economies that are subject to sudden change. These changes may be magnified by the countries’ emergent financial markets, resulting in significant volatility to investments in these countries. These countries also may lack the legal, business and social framework to support securities markets.

In addition, investments in foreign countries are subject to currency risk, meaning that because a portion of the fund’s investments may be denominated in foreign currencies, the fund could experience gains or losses based solely on changes in the exchange rate between foreign currencies and the U.S. dollar.

Debt securities, even investment-grade debt securities, are subject to credit risk. Credit risk is the risk that the inability or perceived inability of the issuer to make interest and principal payments will cause the value of the securities to decrease. As a result the fund’s share price could also decrease. A high credit rating indicates a high degree of confidence by the rating organization that the issuer will be able to withstand adverse business, financial or economic conditions and make interest and principal payments on time. A lower credit rating indicates a greater risk of non-payment. Changes in the credit rating of a debt security held by the fund could have a similar effect. The fund’s credit quality restrictions apply at the time of purchase; the fund will not necessarily sell securities if they are downgraded by a rating agency.

The fund may invest part of its assets in securities rated in the lowest investment-grade category (e.g., BBB), and high-yield debt securities, including so-called junk bonds, which are rated in the fifth category (e.g., BB) or below. As a result, the fund may have increased credit risk. Although their securities are considered investment-grade, issuers of BBB-rated securities (and securities of similar quality) are more likely to have problems making interest and principal payments than issuers of higher-rated securities. Issuers of securities rated BB or below (and securities of similar quality) are even more vulnerable to real or perceived economic changes (such as an economic downturn or a prolonged period of rising interest rates), political changes or adverse developments specific to the issuer. In addition, lower-rated securities may be unsecured or subordinated to other obligations of the issuer. These factors may be more likely to cause an issuer of low-quality debt securities to default on its obligation to pay the interest and principal due under its securities.

When interest rates change, the fund’s share value will be affected. Generally, when interest rates rise, the fund’s share value will decline. The opposite is true when interest rates decline. The degree to which interest rate changes affect the fund’s performance varies and is related to the weighted average maturity of the fund. For example, when interest rates rise, you can expect the share value of a long-term bond fund to fall more than that of a short-term bond fund. When rates fall, the opposite is true. Interest rate risk, however, is generally higher for the fund than for funds that have shorter-weighted average maturities, such as money market and short-term bond funds. The fund will also be exposed to interest rate risk outside of the U.S. where interest rate trends may differ from those in the U.S. A period of rising interest rates may negatively affect the fund’s performance.

The fund may also be subject to liquidity risk. The chance that a fund will have difficulty selling its debt securities is called liquidity risk. During periods of market turbulence or unusually low trading activity, in order to meet redemptions it may be necessary for the fund to sell securities at prices that could have an adverse effect on the fund’s price. The market for lower-quality debt securities is generally even less liquid than the market for higher-quality securities. Adverse publicity and investor perceptions, as well as new and proposed laws, also may have a greater negative impact on the market for lower-quality securities. Changing regulatory and market conditions, including increases in interest rates and credit spreads, may adversely affect the liquidity of the fund’s investments. In addition, when the market for certain investments is illiquid, the fund may be unable to achieve its desired level of exposure to a certain sector. Illiquid securities may be difficult to value.

Sovereign debt instruments, which are instruments issued by foreign governmental entities, are subject to the risk that the governmental entity may be unable or unwilling to repay the principal or interest on its sovereign debt due to, among other reasons, cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of the governmental entity’s debt or its failure to implement economic reforms. There is no bankruptcy process for collecting sovereign debt and legal remedies may be limited and onerous to pursue.

Investing a significant portion of assets in one country or region makes the fund more dependent upon the political and economic circumstances of that particular country or region than a fund that is more widely diversified.

The use of derivative instruments, such as futures, options and swaps, involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional instruments. Derivatives are subject to a number of risks including leverage, liquidity, interest rate, market, credit, counterparty and correlation risk. Derivatives can be highly illiquid and difficult to unwind or value, and changes in the value of a derivative held by the fund may not correlate with the value of the underlying instrument or the fund’s other investments. They also involve the risk of mispricing or improper valuation, the risk that changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index, and the risk of default or bankruptcy of the other party to the instrument. Gains or losses involving some futures, options, and other derivatives may be substantial – in part because the leverage in a derivative instrument may cause a relatively small price movement in these instruments to result in an immediate and substantial gain or loss for the fund.

Futures contracts may experience potentially dramatic price changes (losses) and imperfect correlations between the price of the contract and the underlying security, index or currency which will increase the volatility of the fund and may involve a small investment of cash relative to the magnitude of the risk assumed.

Options are subject to the risk that the underlying security or asset does not rise sufficiently above the exercise price to cover the premium and transaction costs.

Swap agreements are agreements to exchange the return generated by one instrument for the return generated by another instrument (or index). Swap agreements subject a fund to the risk that the counterparty to the transaction may not meet its obligations. The fund also bears the risk of loss of the amount expected to be received under a swap agreement in the event of the default or bankruptcy of a counterparty. Interest rate swaps could result in losses if interest rate changes are not correctly anticipated by the fund. Credit default swaps could result in losses if the fund does not correctly evaluate the creditworthiness of the issuer on which the credit default swap is based.

Investments in bank loans, loans made by banks or other financial intermediaries to borrowers, require the fund to depend primarily upon the creditworthiness of the borrower for payment of principal and interest, exposing the fund to the credit risk of both the financial institution and the underlying borrower. The market for bank loans may not be highly liquid and the fund may have difficulty selling them. In connection with purchasing participations, the fund generally will have no right to enforce compliance by the borrower with the terms of the loan agreement, nor any rights with respect to any funds acquired by other lenders through set-off against the borrower, and the fund may not directly benefit from any collateral supporting the loan in which it has purchased the participation. In addition, transactions in bank loans may take more than seven days to settle. As a result, the proceeds from the sale of bank loans may not be readily available to make additional investments or to meet the fund’s redemption obligations. Some bank loan interests may not be registered under the Securities Act of 1933 and therefore not afforded the protections of the federal securities laws.

The risks of an investment in a collateralized debt obligation depend largely on the type of the collateral securities and the class of the debt obligation in which the fund invests. Collateralized debt obligations (CDOs) and collateralized loan obligations (CLOs) are subject to credit, interest rate, valuation, prepayment and extension risks. These securities also are subject to risk of default on the underlying asset, particularly during periods of economic downturn. The market value of CLO securities may be affected by, among other things, changes in the market value of the underlying assets held by the CLO, changes in the distributions on the underlying assets, defaults and recoveries on the underlying assets, capital gains and losses on the underlying assets, prepayments on underlying assets and the availability, prices and interest rate of underlying assets.

If the fund enters into financial contracts, the fund will be subject to the credit risk presented by the counterparties.

The fund may need to sell securities at times it would not otherwise do so in order to meet shareholder redemption requests. The fund could experience a loss when selling securities, particularly if the redemption requests are unusually large or frequent, occur in times of overall market turmoil or declining pricing for the securities sold or when the securities the fund wishes to sell are illiquid. Selling securities to meet such redemption requests also may increase transaction costs or have tax consequences. To the extent that a large shareholder (including a fund of funds or 529 college savings plan) invests in the fund, the fund may experience relatively large redemptions as such shareholder reallocates its assets. Although the advisor seeks to minimize the impact of such transactions where possible, the fund’s performance may be adversely affected.

The value of securities owned by the fund may go up and down, sometimes rapidly or unpredictably, due to factors affecting securities markets generally, particular industries, real or perceived adverse economic conditions or investor sentiment generally. Market risks, including political, regulatory, economic and social developments, can affect the value of the fund’s investments. Natural disasters, public health emergencies, terrorism and other unforeseeable events may lead to increased market volatility and may have adverse long-term effects on world economies and markets generally.

A pandemic, caused by the infectious respiratory illness COVID-19, is causing travel restrictions, disruption of healthcare systems, prolonged quarantines, cancellations, supply chain interruptions, lower consumer demand, layoffs, credit downgrades, and defaults among other economic impacts. Certain markets have experienced temporary closures, extreme volatility, losses, reduced liquidity and increased trading costs. These events may continue to impact the fund and its underlying investments.

The fund’s share value will fluctuate, and at any given time your shares may be worth less than the price you paid for them. As a result, it is possible to lose money by investing in the fund. In general, funds that have higher potential income have higher potential loss.

Management

Who manages the fund?

The Board of Trustees, investment advisor and fund management team play key roles in the management of the fund.

The Board of Trustees

The Board of Trustees is responsible for overseeing the advisor’s management and operations of the fund pursuant to the management agreement. In performing their duties, Board members receive detailed information about the fund and its advisor regularly throughout the year, and meet at least quarterly with management of the advisor to review reports about fund operations. The trustees’ role is to provide oversight and not to provide day-to-day management. More than three-fourths of the trustees are independent of the fund’s advisor. They are not employees, directors or officers of, and have no financial interest in, the advisor or any of its affiliated companies (other than as shareholders of American Century Investments funds), and they do not have any other affiliations, positions or relationships that would cause them to be considered “interested persons” under the Investment Company Act of 1940.

The Investment Advisor

The fund’s investment advisor is American Century Investment Management, Inc. (the advisor). The advisor has been managing mutual funds since 1958 and is headquartered at 4500 Main Street, Kansas City, Missouri 64111.

The advisor is responsible for managing the investment portfolio of the fund and directing the purchase and sale of its investment securities. The advisor also arranges for transfer agency, custody and all other services necessary for the fund to operate.

For the services it provides to the classes of the fund other than G Class, the advisor receives a unified management fee based on a percentage of the daily net assets of those classes of shares of the fund. The management fee is calculated daily and paid monthly in arrears. The advisor pays all expenses of managing and operating the fund except brokerage expenses, taxes, interest, fees and expenses of the independent trustees (including legal counsel fees), extraordinary expenses, and expenses incurred in connection with the provision of shareholder services and distribution services under a plan adopted pursuant to Rule 12b-1 under the Investment Company Act of 1940. The difference in unified management fees among the classes is a result of their separate arrangements for non-Rule 12b-1 shareholder services. It is not the result of any difference in advisory or custodial fees or other expenses related to the management of the fund’s assets, which do not vary by class. For all classes other than the Y, R6 and G Classes, the advisor may pay unaffiliated third parties who provide recordkeeping and administrative services that would otherwise be performed by an affiliate of the advisor.

The G Class of the fund is subject to a contractual unified management fee that the advisor waives in its entirety. However, the advisor does receive a management fee from funds or client advisory accounts that invest in the G Class.


Management Fees Paid by the Fund to the Advisor as a Percentage of Average Net Assets for the Fiscal Year Ended October 31, 2020	Investor Class	I Class	Y Class	A Class	C Class	R Class	R5 Class	R6 Class	G Class
Emerging Markets Debt	0.96%	0.86%	0.76%	0.96%	0.96%	0.96%	0.76%	0.71%	0.00%

A discussion regarding the basis for the Board of Trustees’ approval of the fund’s investment advisory agreement with the advisor is available in the fund’s annual report to shareholders dated October 31, 2020.

The Fund Management Team

The advisor uses teams of portfolio managers and analysts, organized by broad investment categories such as money markets, corporate bonds, government bonds and municipal bonds, in its management of fixed-income funds. Designated portfolio managers serve on the firm’s Global Fixed Income Investment Committee, which is responsible for periodically adjusting the fund’s dynamic investment parameters based on economic and market conditions. The fund’s other portfolio managers are responsible for security selection and portfolio construction for the fund within these parameters, as well as compliance with stated investment objectives and cash flow monitoring. Other members of the investment team provide research and analytical support but generally do not make day-to-day investment decisions for the fund.

The individuals listed below are jointly and primarily responsible for the day-to-day management of the fund described in this prospectus.

John A. Lovito (Global Fixed Income Investment Committee Representative)

Mr. Lovito, Senior Vice President and Senior Portfolio Manager, has served on teams managing fixed-income investments since joining the advisor in 2009. He has a bachelor’s degree in economics and an MBA in finance from Fordham University.

Brian Howell

Mr. Howell, Vice President and Senior Portfolio Manager, has served on teams managing fixed-income investments since joining the advisor in 1987. He has a bachelor’s degree in mathematics/statistics and an MBA in finance from the University of California – Berkeley.

Thomas Youn

Mr. Youn, Portfolio Manager and Senior Corporate Analyst, has served on teams managing fixed-income investments for American Century Investments since joining the advisor in 2014. He has a bachelor’s degree in biology from Brown University and an MBA from The University of Chicago Booth School of Business.

Alessandra Alecci

Ms. Alecci, Vice President, Portfolio Manager and Senior Sovereign Analyst, has served on teams managing fixed-income investments since joining the advisor in 2015. She has a bachelor’s degree in history from New York University and a master’s degree in international economic policy from the School of International and Public Affairs at Columbia University.

The statement of additional information provides additional information about the accounts managed by the portfolio managers, the structure of their compensation, and their ownership of fund securities.

Fundamental Investment Policies

Shareholders must approve any change to the fundamental investment policies contained in the statement of additional information. The Board of Trustees and/or the advisor may change the fund’s investment objective and any other policies or investment strategies described in this prospectus or otherwise used in the operation of the fund at any time, subject to applicable notice provisions.

Investing Directly with American Century Investments

Services Automatically Available to You

Most accounts automatically have access to the services listed under Ways to Manage Your Account when the account is opened. If you have questions about the services that apply to your account type, please call us.

Generally, once your account is established, any registered owner (including those on jointly owned accounts) or any trustee (including those on trust accounts with multiple trustees), or any authorized signer on business accounts with multiple authorized signers, may transact business by any of the methods described below. American Century reserves the right to require all owners or trustees or authorized signers to act together, at our discretion.

Account Maintenance Fee

If you hold Investor Class shares of any American Century Investments fund, or I Class shares of the American Century Diversified Bond Fund, in an American Century Investments account (i.e., not through a financial intermediary or employer-sponsored retirement plan account), we may charge you a $25.00 annual account maintenance fee if the value of those shares is less than $10,000. We will determine the amount of your total eligible investments once per year, generally the last Friday in October. If the value of those investments is less than $10,000 at that time, we will automatically redeem shares in one of your accounts to pay the $25.00 fee as soon as administratively possible. Please note that you may incur tax liability as a result of the redemption. In determining your total eligible investment amount, we will include your investments in all personal accounts (including American Century Investments brokerage accounts) registered under your Social Security number. We will not charge the fee as long as you choose to manage your accounts exclusively online. You may enroll for exclusive online account management by visiting americancentury.com. Regardless of whether you manage your account online, you may request a paper copy of the prospectus, statement of additional information, or annual report free of charge.


			Personal accounts include individual accounts, joint accounts, UGMA/UTMA accounts, personal trusts, Coverdell Education Savings Accounts, IRAs (including traditional, Roth, Rollover, SEP-, SARSEP- and SIMPLE-IRAs), and certain other retirement accounts. If you have only business, business retirement, employer-sponsored or American Century Investments brokerage accounts, you are currently not subject to this fee, but you may be subject to other fees.

Wire Purchases

Current Investors: If you would like to make a wire purchase into an existing account, your bank will need the following information. (To invest in a new fund, please call us first to set up the new account.)

•American Century Investments bank information: Commerce Bank N.A., Routing No. 101000019, Account No. 2804918

•Your American Century Investments account number and fund name

•Your name

•The contribution year (for IRAs only)

•Dollar amount

New Investors: To make a wire purchase into a new account, please complete an application or call us prior to wiring money.

Ways to Manage Your Account

ONLINE

americancentury.com

Open an account: If you are a current or new investor, you can open an account by completing and submitting our online application. Current investors also can open an account by exchanging shares from another American Century Investments account with an identical registration.

Exchange shares: Exchange shares from another American Century Investments account with an identical registration.

Make additional investments: Make an additional investment into an established American Century Investments account. If we do not have your bank information, you can add it.

Sell shares*: Redeem shares and choose whether the proceeds are electronically transferred to your authorized bank account or sent by check to your address of record.

* Online redemptions up to $25,000 per day per account.

IN PERSON

If you prefer to handle your transactions in person, visit one of our Investor Centers and a representative can help you open an account, make additional investments, and sell or exchange shares.

•4500 Main Street, Kansas City, MO — 8 a.m. to 5 p.m., Monday – Friday

•4917 Town Center Drive, Leawood, KS — 8 a.m. to 5 p.m., Monday – Friday

BY TELEPHONE

Investor Services Representative: 1-800-345-2021

Business, Not-For-Profit and Employer-Sponsored Retirement Plans: 1-800-345-3533

Automated Information Line: 1-800-345-8765

Open an account: If you are a current investor, you can open an account by exchanging shares from another American Century Investments account with an identical registration.

Exchange shares: Call or use our Automated Information Line (available only to Investor Class shareholders).

Make additional investments: Call or use our Automated Information Line if you have authorized us to invest from your bank account. The Automated Information Line is available only to Investor Class shareholders.

Sell shares: Call or use our Automated Information Line. The Automated Information Line redemptions are up to $25,000 per day per account and are available for Investor Class shareholders only.

BY MAIL OR FAX

Mail Address: P.O. Box 419200, Kansas City, MO 64141-6200 — Fax: 1-888-327-1998

Open an account: Send a signed, completed application and check or money order payable to American Century Investments.

Exchange shares: Send written instructions to exchange your shares from one American Century Investments account to another with an identical registration.

Make additional investments: Send your check or money order for at least $50 with an investment slip. If you don’t have an investment slip, include your name, address and account number on your check or money order.

Sell shares: Send written instructions or a redemption form to sell shares. Call a Service Representative to request a form.

AUTOMATICALLY

Open an account: Not available.

Exchange shares: Send written instructions to set up an automatic exchange of your shares from one American Century Investments account to another with an identical registration.

Make additional investments: With the automatic investment service, you can purchase shares on a regular basis. You must invest at least $50 per month per account.

Sell shares: You may sell shares automatically by establishing a systematic redemption plan.

See Additional Policies Affecting Your Investment for more information about investing with us.

Investing Through a Financial Intermediary

The fund may be purchased by participants in employer-sponsored retirement plans or through financial intermediaries that provide various administrative and distribution services.


			Financial intermediaries include banks, broker-dealers, insurance companies, plan sponsors and financial professionals.

Although each class of the fund’s shares represents an interest in the same fund, each has a different cost structure, as described below. Which class is right for you depends on many factors, including how long you plan to hold the shares, how much you plan to invest, the fee structure of each class, and how you wish to compensate your financial professional for the services provided to you. Your financial professional can help you choose the option that is most appropriate.

Investor Class

Investor Class shares are available for purchase without sales charges or commissions but may be subject to account or transaction fees if purchased through financial intermediaries. These shares are available to investors in retail brokerage accounts, broker-dealer-sponsored fee-based advisory accounts, other advisory accounts where fees are charged, and employer-sponsored retirement plans.

I Class

I Class shares are available for purchase without sales charges or commissions by endowments, foundations, large institutional investors and financial intermediaries.

Y Class

A Class

A Class shares are available for purchase through broker-dealers and other financial intermediaries. These shares carry an initial sales charge and an ongoing distribution and service (12b-1) fee that is used to compensate your financial professional. See Calculation of Sales Charges below for commission amounts received by financial professionals on the purchase of A Class shares. The sales charge decreases with the size of the purchase, and may be reduced or eliminated in certain situations. See Reductions and Waivers of Sales Charges for A Class and CDSC Waivers below for a full description of the breakpoints, reductions and waivers that may be available through financial intermediaries in certain types of accounts or products.

C Class

C Class shares are available for purchase through broker-dealers and other financial intermediaries. These shares do not have an initial sales charge but carry an ongoing distribution and service (12b-1) fee. Except as noted below, the commission paid to your financial professional for purchases of C Class shares is 1.00% of the amount invested, and the shares have a contingent deferred sales charge (CDSC) when redeemed within one year of purchase. Your financial professional does not receive the distribution and service (12b-1) fee until the CDSC period has expired (it is retained by the distributor). See CDSC Waivers below for a full description of the waivers that may be available. C Class shares automatically convert to A Class shares 8 years after purchase.

R Class

R Class shares do not carry a sales charge or commission, but they have an ongoing distribution and service (12b-1) fee. R Class shares are available for purchase through certain employer-sponsored retirement plans. R Class shares also may be available for certain other accounts through financial intermediaries who have an agreement with us to offer R Class in certain products. Additionally, IRA accounts in R Class shares established through financial intermediaries prior to August 1, 2006, may make additional purchases. With respect to purchases through financial intermediaries, R Class shares are not available in the following types of employer-sponsored retirement plans: SEP IRAs, SIMPLE IRAs or SARSEPs, except that investors in such plans with accounts in R Class shares established prior to March 1, 2009, may make additional purchases, and certain intermediaries may have agreements with us to offer R Class shares in such plans as described above.

R5 Class

R5 Class shares are available for purchase without sales charges or commissions by participants in certain employer-sponsored retirement plans. Beginning April 10, 2017, R5 Class shares may be purchased or redeemed only through employer-sponsored retirement plans where a financial intermediary provides retirement recordkeeping services to plan participants. Accounts in R5 Class shares opened prior to April 10, 2017 remain eligible for the R5 Class.

R6 Class

R6 Class shares are available for purchase without sales charges or commissions by participants in certain employer-sponsored retirement plans. R6 Class shares may be purchased or redeemed only through employer-sponsored retirement plans where a financial intermediary provides retirement recordkeeping services to plan participants.

Calculation of Sales Charges

The information regarding sales charges provided herein is included free of charge and in a clear and prominent format at americancentury.com in the Investors Using Advisors and Investment Professionals portions of the website. From the description of A or C Class shares, a hyperlink will take you directly to this disclosure.

The availability of the sales charge reductions and waivers discussed below will depend upon whether you purchase your shares directly from the fund or through a financial intermediary. Intermediaries may have different policies and procedures regarding the availability of these reductions or waivers. Please refer to Appendix A for information provided by certain financial intermediaries regarding their sales charge waiver or discount policies that are applicable to investors transacting in fund shares through such financial intermediary.

A Class

A Class shares are sold at their offering price, which is net asset value plus an initial sales charge. This sales charge varies depending on the amount of your investment, and is deducted from your purchase before it is invested. The sales charges and the amounts paid to your financial professional are:


Purchase Amount	Sales Charge as a % of Offering Price	Sales Charge as a % of Net Amount Invested	Dealer Commission as a % of Offering Price
Less than $100,000	4.50%	4.71%	4.00%
$100,000 - $249,999	3.50%	3.63%	3.00%
$250,000 - $499,999	2.50%	2.56%	2.00%
$500,000 - $999,999	2.00%	2.04%	1.75%
$1,000,000 - $3,999,999	0.00%	0.00%	0.75%
$4,000,000 - $9,999,999	0.00%	0.00%	0.50%
$10,000,000 or more	0.00%	0.00%	0.25%

There is no front-end sales charge for purchases of $1,000,000 or more, but if you redeem your shares within one year of purchase you will pay a deferred sales charge of 1.00% of the lower of the original purchase price or the current market value at redemption, subject to the exceptions listed below. No sales charge applies to reinvested dividends. No dealer commission will be paid to your financial professional for purchases by certain employer-sponsored retirement plans. For this purpose, employer-sponsored retirement plans do not include SEP IRAs, SIMPLE IRAs or SARSEPs.

Reductions and Waivers of Sales Charges for A Class

You may qualify for a reduction or waiver of certain sales charges, but you or your financial professional must provide certain information, including the account numbers of any accounts to be aggregated, to American Century Investments at the time of purchase in order to take advantage of such reduction or waiver. If you hold assets among multiple intermediaries, it is your responsibility to inform your intermediary and/or American Century Investments at the time of purchase of any accounts to be aggregated.

You and your immediate family (which includes your spouse or domestic partner and children, step-children, parents or step-parents of you, your spouse or domestic partner) may combine investments in any share class of any American Century Investments fund (excluding certain assets in money market accounts, but including account assets invested in Qualified Tuition Programs under Section 529) to reduce your A Class sales charge in the following ways:

Account Aggregation. Investments made by you and your immediate family may be aggregated at each account’s current market value if made for your own account(s) and/or certain other accounts, such as:

•Certain trust accounts

•Solely controlled business accounts

•Single-participant retirement plans

•Endowments or foundations established and controlled by you or an immediate family member

For purposes of aggregation, only investments made through individual-level accounts may be combined. Assets held in multiple participant employer-sponsored retirement plans may be aggregated at a plan level.

Concurrent Purchases. You may combine simultaneous purchases in any share class of any American Century Investments fund to qualify for a reduced A Class sales charge.

Rights of Accumulation. You may take into account the current value of your existing holdings, less commissionable shares in the money market funds, in any share class of any American Century Investments fund to qualify for a reduced A Class sales charge.

Letter of Intent. A Letter of Intent allows you to combine all purchases of any share class of any American Century Investments fund you intend to make over a 13-month period to determine the applicable sales charge, except for purchases in the A or C Class of money market funds. At your request, existing holdings may be combined with new purchases and sales charge amounts may be adjusted for purchases made within 90 days prior to our receipt of the Letter of Intent. Capital appreciation, capital gains and reinvested dividends earned during the Letter of Intent period do not apply toward its completion. A portion of your account will be held in escrow to cover additional A Class sales charges that will be due if your total investments over the 13-month period do not qualify for the applicable sales charge reduction.

Waivers for Certain Investors. The sales charge on A Class shares may be waived for:

•Purchases by registered representatives and other employees of certain financial intermediaries (and their immediate family members, which includes their spouse or domestic partner and children, step-children, parents or step-parents of them, their spouse or domestic partner) having selling agreements with the advisor or distributor

•Broker-dealer sponsored wrap program accounts and/or fee-based accounts maintained for clients of certain financial intermediaries who have entered into selling agreements with American Century Investments

•Purchases in accounts of financial intermediaries that have entered into a selling agreement with American Century Investments that allows for the waiver of the sales charge in brokerage accounts that may or may not charge a transaction fee

•Current officers, directors and employees of American Century Investments

•Certain group employer-sponsored retirement plans, where plan level or omnibus accounts are held with the fund, or shares are purchased by certain retirement plans that are part of a retirement plan or platform offered by banks, broker dealers, financial advisors or insurance companies, or serviced by retirement recordkeepers. For purposes of this waiver, employer-sponsored retirement plans do not include SEP IRAs, SIMPLE IRAs or SARSEPs. However, SEP IRA, SIMPLE IRA or SARSEP retirement plans that (i) held shares of an A Class fund prior to March 1, 2009 that received sales charge waivers or (ii) held shares of an Advisor Class fund that was renamed A Class on March 1, 2010, may permit additional purchases by new and existing participants in A Class shares without an initial sales charge. Refer to Buying and Selling Fund Shares in the statement of additional information

•Purchases of additional shares in accounts that held shares of an Advisor Class fund that was renamed A Class on either September 4, 2007, December 3, 2007 or March 1, 2010. However, if you close your account or if you transfer your account to another financial intermediary, future purchases of A Class shares of a fund may not receive a sales charge waiver.

An investor who receives a sales charge waiver for purchases of fund shares through a financial intermediary may become ineligible to receive such waiver if the nature of the investor’s relationship with and/or the services it receives from the financial intermediary changes. Please consult with your financial professional for further details.

C Class

C Class shares are sold at their net asset value without an initial sales charge. If you purchase shares through a financial intermediary who receives a commission from the fund’s distributor on the purchase and redeem your shares within 12 months of purchase, you will pay a CDSC of 1.00% of the original purchase price or the current market value at redemption, whichever is less. The purpose of the CDSC is to permit the fund’s distributor to recoup all or a portion of the up-front payment made to your financial professional. There is no CDSC on shares acquired through reinvestment of dividends or capital gains.

American Century Investments generally limits purchases of C Class shares to investors whose aggregate investments in American Century Investments funds are less than $1,000,000. However, it is your responsibility to inform your financial intermediary and/or American Century Investments at the time of purchase of any accounts to be aggregated, including investments in any share class of any American Century Investments fund (excluding certain assets in money market accounts, but including account assets invested in Qualified Tuition Programs under Section 529) in accounts held by you and your immediate family members (which includes your spouse or domestic partner and children, step-children, parents or step-parents of you, your spouse or domestic partner). Once you reach this limit, you should work with your financial intermediary to determine what share class is most appropriate for additional purchases.

C Class shares automatically convert to A Class shares after being held for 8 years. The automatic conversion will be executed in the month following the 8-year anniversary of the purchase date for such C Class shares without any sales charge, fee or other charges. The conversion from C Class shares is not considered a taxable event for Federal income tax purposes. After the conversion, shares will be subject to all features and expenses of A Class shares.

Calculation of Contingent Deferred Sales Charge (CDSC)

To minimize the amount of the CDSC you may pay when you redeem shares, the fund will first redeem shares acquired through reinvested dividends and capital gain distributions, which are not subject to a CDSC. Shares that have been in your account long enough that they are not subject to a CDSC are redeemed next. For any remaining redemption amount, shares will be sold in the order they were purchased (earliest to latest).

CDSC Waivers

Any applicable CDSC for A or C Classes may be waived in the following cases:

•redemptions through systematic withdrawal plans not exceeding annually 12% of the lesser of the original purchase cost or current market value

•redemptions through employer-sponsored retirement plans. For this purpose, employer-sponsored retirement plans do not include SEP IRAs, SIMPLE IRAs or SARSEPs.

•distributions from IRAs due to attainment of age 59½ for A and C Class shares

•required minimum distributions from retirement accounts due to the shareholder reaching the qualified age based on applicable IRS regulations

•tax-free returns of excess contributions to IRAs

•redemptions due to death or post-purchase disability

•exchanges, unless the shares acquired by exchange are redeemed within the original CDSC period

•IRA Rollovers from any American Century Investments fund held in an employer-sponsored retirement plan, for A Class shares only

•if no dealer commission was paid to the financial intermediary on the purchase for any other reason

Reinstatement Privilege

Within 90 days of a redemption, dividend payment or capital gains distribution of any A Class shares, you may reinvest all or a portion of the proceeds in A Class shares of any American Century Investments fund at the then-current net asset value without paying an initial sales charge. At your request, any CDSC you paid on an A Class redemption that you are reinvesting will be credited to your account. You may use the privilege only once per account. This privilege may only be invoked by the original account owner to reinvest shares in an account with the same registration as the account from which the redemption or distribution originated. This privilege does not apply to systematic or automatic transactions, including, for example, automatic purchases, withdrawals and payroll deductions. If you wish to use this reinvestment privilege, you or your financial professional must provide written notice to American Century Investments.

Employer-Sponsored Retirement Plans

Certain group employer-sponsored retirement plans that hold a single account for all plan participants with the fund, or that are part of a retirement plan or platform offered by banks, broker-dealers, financial advisors or insurance companies, or serviced by retirement recordkeepers are eligible to purchase Investor, A, C, R, R5 and R6 Class shares. Employer-sponsored retirement plans are not eligible to purchase I or Y Class shares. For more information regarding employer-sponsored retirement plan types, please refer to Buying and Selling Fund Shares in the statement of additional information. A and C Class purchases are available at net asset value with no dealer commission paid to the financial professional, and do not incur a CDSC. A, C and R Class shares purchased in employer-sponsored retirement plans are subject to applicable distribution and service (12b-1) fees, which the financial intermediary begins receiving immediately at the time of purchase. American Century Investments does not impose minimum initial investment amount, plan size or participant number requirements by class for employer-sponsored retirement plans; however, financial intermediaries or plan recordkeepers may require plans to meet different requirements.

Exchanging Shares

You may exchange shares of the fund for shares of the same class of another American Century Investments fund without a sales charge if you meet the following criteria:

•The exchange is for a minimum of $100

•For an exchange that opens a new account, the amount of the exchange must meet or exceed the minimum account size requirement for the fund receiving the exchange

For purposes of computing any applicable CDSC on shares that have been exchanged, the holding period will begin as of the date of purchase of the original fund owned. Exchanges from a money market fund are subject to a sales charge on the fund being purchased, unless the money market fund shares were acquired by exchange from a fund with a sales charge or by reinvestment of dividends or capital gains distributions.

Moving Between Share Classes and Accounts

You may move your investment between share classes (within the same fund or between different funds) in certain circumstances deemed appropriate by American Century Investments. You also may move investments held in certain accounts to a different type of account if you meet certain criteria. Please contact your financial professional for more information about moving between share classes or account types.

Buying and Selling Shares Through a Financial Intermediary

Your ability to purchase, exchange, redeem and transfer shares will be affected by the policies of the financial intermediary through which you do business. Some policy differences may include

•minimum investment requirements

•exchange policies

•fund choices

•cutoff time for investments

•trading restrictions

In addition, your financial intermediary may charge a transaction fee for the purchase or sale of fund shares. Those charges are retained by the financial intermediary and are not shared with American Century Investments or the fund. Please contact your financial intermediary or plan sponsor for a complete description of its policies. Copies of the fund’s annual report, semiannual report and statement of additional information are available from your financial intermediary or plan sponsor.

The fund has authorized certain financial intermediaries to accept orders on the fund’s behalf. American Century Investments has selling agreements with these financial intermediaries requiring them to track the time investment orders are received and to comply with procedures relating to the transmission of orders. Orders must be received by the financial intermediary on the fund’s behalf before the time the net asset value is determined in order to receive that day’s share price. If those orders are transmitted to American Century Investments and paid for in accordance with the selling agreement, they will be priced at the net asset value next determined after your request is received in the form required by the financial intermediary.

If you submit a transaction request through a financial intermediary that does not have a selling agreement with us, or if the financial intermediary’s selling agreement does not cover the type of account or share class requested, we may reject or cancel the transaction without prior notice to you or the intermediary.

Investor, I and Y Class shares may also be available on brokerage platforms of financial intermediaries that have agreements with American Century Investments to offer such shares solely when acting as an agent for the shareholder. A shareholder transacting in Investor, I or Y Class shares in these programs may be required to pay a commission and/or other forms of compensation to the broker. Shares of the fund are available in other share classes that have different fees and expenses.

See Additional Policies Affecting Your Investment for more information about investing with us.

Additional Policies Affecting Your Investment

Eligibility for Investor Class Shares

The fund’s Investor Class shares are available for purchase directly from American Century Investments and through the following types of products, programs or accounts offered by financial intermediaries:

•self-directed accounts on transaction-based platforms that may or may not charge a transaction fee

•employer-sponsored retirement plans

•broker-dealer sponsored fee-based wrap programs or other fee-based advisory accounts

•insurance products and bank/trust products where fees are being charged

The fund reserves the right, when in the judgment of American Century Investments it is not adverse to the fund’s interest, to permit all or only certain types of investors to open new accounts in the fund, to impose further restrictions, or to close the fund to any additional investments, all without notice.

Minimum Initial Investment Amounts for Investor, A, C and R Classes

Unless otherwise specified below, the minimum initial investment amount to open an account is $2,500. However, American Century Investments will waive the fund minimum if you make an initial investment of at least $500 and continue to make automatic investments of at least $100 a month until reaching the fund minimum. Investors opening accounts through financial intermediaries may open an account with $250, but the financial intermediaries may require their clients to meet different investment minimums. See Investing Through a Financial Intermediary for more information.


Broker-dealer sponsored wrap program accounts and/or fee-based advisory accounts			No minimum
Coverdell Education Savings Account (CESA)and IRAs			$1,0001, 2
Employer-sponsored retirement plans			No minimum

1 American Century Investments will waive the fund minimum if you make an initial investment of at least $500 and continue to make automatic monthly investments of at least $100 a month until reaching the minimum.

2 The minimum initial investment for shareholders investing through financial intermediaries is $250. Financial intermediaries may have different minimums for their clients.

Subsequent Purchases

There is a $50 minimum for subsequent purchases. See Ways to Manage Your Account for more information about making additional investments directly with American Century Investments. However, there is no subsequent purchase minimum for financial intermediaries or employer-sponsored retirement plans, but financial intermediaries may require their clients to meet different subsequent purchase requirements.

Eligibility for I Class Shares

The I Class shares are made available for purchase by individuals and large institutional shareholders such as bank trust departments, corporations, endowments, foundations and financial advisors that meet the fund’s minimum investment requirements.

Minimum Initial Investment Amounts for I Class

The minimum initial investment amount is generally $5 million ($3 million for endowments and foundations) per fund. If you invest with us through a financial intermediary, this requirement may be met if your financial intermediary aggregates your investments with those of other clients into a single group, or omnibus, account that meets the minimum. The minimum investment requirement may be waived if you have an aggregate investment in our family of funds of $10 million or more ($5 million for endowments and foundations). This includes accounts held directly with American Century and those held through a financial intermediary. American Century Investments also may waive the minimum initial investment in other situations it deems appropriate.

American Century Investments may permit an intermediary to waive the initial minimum per shareholder as provided in Buying and Selling Fund Shares in the statement of additional information.

Eligibility for Y Class Shares

Y Class shares are available for purchase without sales charges or commissions through financial intermediaries that offer fee based advisory programs. Y Class shares may be purchased or redeemed only through financial intermediaries that trade in omnibus accounts with American Century Investments. Y Class shares may not be purchased by shareholders investing through employer-sponsored retirement plans or individuals investing directly with American Century Investments.

Minimum Initial Investment Amounts for Y Class

There is no minimum initial investment amount or subsequent investment amount for Y Class shares, but financial intermediaries may require different investment minimums.

Eligibility for R5 and R6 Class Shares

R6 Class shares also are available to funds of funds advised by American Century and unaffiliated funds of funds sold primarily to the employer-sponsored retirement plan market.

R5 and R6 Class shares are not available to retail accounts, traditional or Roth IRAs, SEP IRAs, SIMPLE IRAs, SARSEPs or Coverdell education savings accounts. However, accounts in R5 Class shares opened prior to April 10, 2017, remain eligible for the R5 Class.

Minimum Initial Investment Amounts for R5 and R6 Class

There is no minimum initial investment amount or subsequent investment amount for R5 and R6 Class shares, but financial intermediaries or plan recordkeepers may require plans to meet different investment minimums.

Eligibility and Minimum Initial Investment Amounts for G Class

Redemptions

Your redemption proceeds will be calculated using the net asset value (NAV) next determined after we receive your transaction request in good order. If you sell C or, in certain cases, A Class shares, you may pay a sales charge, depending on how long you have held your shares, as described above.

Generally, we expect to remit your redemption proceeds to you one business day after we process your transaction. However, we reserve the right to delay delivery of redemption proceeds up to seven days. For example, each time you make an investment with American Century Investments, there is a seven-day holding period before we will release redemption proceeds from those shares, unless you provide us with satisfactory proof that your purchase funds have cleared. Investments by wire generally require only a one-day holding period. If you change your address, we may require that any redemption request made within seven days be submitted in writing and be signed by all authorized signers with their signatures guaranteed. We may also require a signature guarantee for redemptions in other situations, as described below. If you change your bank information, we may impose a seven-day holding period before we will transfer or wire redemption proceeds to your bank. Please remember, if you request redemptions by wire, $10 will be deducted from the amount redeemed. Your bank also may charge a fee.

Additionally, if you are age 65 or older, or if we have reason to believe you have a mental or physical impairment that renders you unable to protect your own interest, we may temporarily delay the disbursement of redemption proceeds from your account if we believe that you have been the victim of actual or attempted financial exploitation. This temporary delay will be for an initial period of no more than 15 business days while we conduct an internal review of the facts and circumstances of the suspected financial exploitation. If our internal review supports our belief that actual or attempted financial exploitation has occurred or is occurring, we may extend the hold for up to 10 additional business days. At the expiration of the additional hold time, if we have not confirmed that exploitation has occurred, the proceeds will be released to you.

Under normal market conditions, the fund generally meets redemption requests through its holdings of cash or cash equivalents or by selling portfolio securities. However, we reserve the right to honor certain redemptions with securities, rather than cash, as described in the next section. Additionally, the fund may consider interfund lending to meet redemption requests. The fund is more likely to use these other methods to meet large redemption requests or during times of market stress.

Special Requirements for Large Redemptions

If, during any 90-day period, you redeem fund shares worth more than $250,000 (or 1% of the value of a fund’s assets if that amount is less than $250,000), we reserve the right to pay part or all of the redemption proceeds in excess of this amount in readily marketable securities instead of in cash. To the extent practicable, these securities will represent your pro rata share of the fund’s securities.

We will value these securities in the same manner as we do in computing the fund’s net asset value. We may provide these securities in lieu of cash without prior notice. Also, if payment is made in securities, you may have to pay brokerage or other transaction costs to convert the securities to cash. These securities remain subject to market risk until sold, and you may incur capital gains and/or losses when you sell the securities.

If your redemption would exceed this limit and you would like to avoid being paid in securities, please provide us with an unconditional instruction to redeem at least 15 days prior to the date on which the redemption transaction is to occur. The instruction must specify the dollar amount or number of shares to be redeemed and the date of the transaction. This minimizes the effect of the redemption on a fund and its remaining investors.

Redemption of Shares in Accounts Below Minimum

If your account balance falls below the minimum initial investment amount for any reason, or if you cancel your automatic monthly investment plan prior to reaching the fund minimum,American Century Investments reserves the right to redeem the shares in the account and send the proceeds to your address of record. Prior to doing so, we will notify you and give you 60 days to meet the minimum or reinstate your automatic monthly investment plan. Please note that shares redeemed in this manner may be subject to a sales charge if held less than the applicable time period. You also may incur tax liability as a result of the redemption. For I Class shares, we reserve the right to convert your shares to Investor Class shares of the same fund. The Investor Class shares have a unified management fee that is 0.10 percentage points higher than the I Class.

Small Distributions and Uncashed Distribution Checks

Generally, dividends and distributions cannot be paid by check for an amount less than $50. Any such amount will be automatically reinvested in additional shares. The fund reserves the right to reinvest any dividend or distribution amount you elect to receive by check if your check is returned as undeliverable or if you do not cash your check within six months. Interest will not accrue on the amount of your uncashed check. We will reinvest your check into your account at the NAV on the day of reinvestment. When reinvested, those amounts are subject to the risk of loss like any other fund investment. We also reserve the right to change your election to receive dividends and distributions in cash after a check is returned undeliverable or uncashed for the six month period, and we may automatically reinvest all future dividends and distributions at the NAV on the date of the payment.

Signature Guarantees

A signature guarantee — which is different from a notarized signature — is a warranty that the signature presented is genuine. We may require a signature guarantee for the following transactions.

•Your redemption or distribution check or automatic redemption is made payable to someone other than the account owners;

•Your redemption proceeds or distribution amount is sent by EFT (ACH or wire) to a destination other than your personal bank account;

•You are transferring ownership of an account over $100,000;

•You change your address and request a redemption over $100,000 within seven days;

•You request proceeds from redemptions, dividends, or distributions be sent to an address or financial institution differing from those on record; or

•You make a redemption or other transaction request via telephone, and we are unable to verify your identity.

We reserve the right to require a signature guarantee for other transactions, or we may employ other security measures, such as signature comparison or notarized signature, at our discretion.

Canceling a Transaction

American Century Investments will use its best efforts to honor your request to revoke a transaction instruction if your revocation request is received prior to the close of trading on the New York Stock Exchange (NYSE) (generally 4 p.m. Eastern time) on the trade date of the transaction. Once processing has begun, or the NYSE has closed on the trade date, the transaction can no longer be canceled. Each fund reserves the right to suspend the offering of shares for a period of time and to reject any specific investment (including a purchase by exchange). Additionally, we may refuse a purchase if, in our judgment, it is of a size that would disrupt the management of a fund.

Frequent Trading Practices

Frequent trading and other abusive trading practices may disrupt portfolio management strategies and harm fund performance. If the cumulative amount of frequent trading activity is significant relative to a fund’s net assets, the fund may incur trading costs that are higher than necessary as securities are first purchased then quickly sold to meet the redemption request. In such case, the fund’s performance could be negatively impacted by the increased trading costs created by frequent trading if the additional trading costs are significant.

Because of the potentially harmful effects of abusive trading practices, the fund’s Board of Trustees has approved American Century Investments’ abusive trading policies and procedures, which are designed to reduce the frequency and effect of these activities in our funds. These policies and procedures include monitoring trading activity, imposing trading restrictions on certain accounts and using fair value pricing when current market prices are not readily available. Although these efforts are designed to discourage abusive trading practices, they cannot eliminate the possibility that such activity will occur. American Century Investments seeks to exercise its judgment in implementing these tools to the best of its ability in a manner that it believes is consistent with shareholder interests.

American Century Investments uses a variety of techniques to monitor for and detect frequent trading practices. These techniques may vary depending on the type of fund, the class of shares or whether the shares are held directly or indirectly with American Century Investments. They may change from time to time as determined by American Century Investments in its sole discretion. To minimize harm to the funds and their shareholders, we reserve the right to reject any purchase order (including exchanges) from any shareholder we believe has a history of frequent trading or whose trading, in our judgment, has been or may be disruptive to the funds. In making this judgment, we may consider trading done in multiple accounts under common ownership or control.

Currently, for shares held directly with American Century Investments, we may deem the sale of all or a substantial portion of a shareholder’s purchase of fund shares to be frequent trading if the sale is made:

•within seven days of the purchase; or

•within 30 days of the purchase, if it happens more than once per year.

To the extent practicable, we try to use the same approach for defining frequent trading for shares held through financial intermediaries. American Century Investments reserves the right, in its sole discretion, to identify other trading practices as abusive and to modify its monitoring and other practices as necessary to deal with novel or unique abusive trading practices.

The frequent trading limitations do not apply to the following types of transactions:

•purchases of shares through reinvested distributions (dividends and capital gains);

•redemption of shares to pay fund or account fees;

•CheckWriting redemptions;

•redemptions requested following the death of a registered shareholder;

•transactions through automatic purchase or redemption plans;

•transfers and re-registrations of shares within the same fund;

•shares exchanged from one share class to another within the same fund;

•transactions by 529 college savings plans and funds of funds (however shareholders of American Century’s funds of funds are subject to the limitations); and

•reallocation or rebalancing transactions in broker-dealer sponsored fee-based wrap and advisory programs.

For shares held in employer-sponsored retirement plans, generally only participant-directed exchange transactions are subject to the frequent trading restrictions. For this purpose, employer-sponsored retirement plans do not include SEP IRAs, SIMPLE IRAs, or SARSEPs.

In addition, American Century Investments reserves the right to accept purchases and exchanges in excess of the trading restrictions discussed above if it believes that such transactions would not be inconsistent with the best interests of fund shareholders or this policy.

American Century Investments’ policies do not permit us to enter into arrangements with fund shareholders that permit such shareholders to engage in frequent purchases and redemptions of fund shares. Due to the complexity and subjectivity involved in identifying abusive trading activity and the volume of shareholder transactions American Century Investments handles, there can be no assurance that American Century Investments’ efforts will identify all trades or trading practices that may be considered abusive. American Century Investments monitors aggregate trades placed in omnibus accounts and works with financial intermediaries to identify shareholders engaging in abusive trading practices and impose restrictions to discourage such practices. Because American Century Investments relies on financial intermediaries to provide information and impose restrictions, our ability to monitor and discourage abusive trading practices in omnibus accounts may be dependent upon the intermediaries’ timely performance of such duties and restrictions may not be applied uniformly in all cases.

Your Responsibility for Unauthorized Transactions

American Century Investments and its affiliated companies use procedures reasonably designed to confirm that telephone, electronic and other instructions are genuine. These procedures include recording telephone calls, requesting additional identifying information, requiring personalized security codes or other information online, and sending confirmation of transactions. If we follow these procedures, we are not responsible for any losses that may occur due to unauthorized instructions. For transactions conducted over the Internet, we recommend the use of a secure Internet browser. In addition, you should verify the accuracy of your confirmation statements immediately after you receive them.

A Note About Mailings to Shareholders

To reduce the amount of mail you receive from us, we generally deliver a single copy of fund documents (like shareholder reports, proxies and prospectuses) to investors who share an address, even if their accounts are registered under different names. Investors who share an address may also receive account-specific documents (like statements) in a single envelope. If you prefer to receive your documents addressed individually, please call us or your financial professional. For American Century Investments brokerage accounts, please call 1-888-345-2071.

Right to Change Policies

We reserve the right to change any stated investment requirement, including those that relate to purchases, exchanges and redemptions. In accordance with applicable law, we also may alter, add or discontinue any service or privilege. Changes may affect all investors or only those in certain classes or groups. In addition, from time to time we may waive a policy on a case-by-case basis, as the advisor deems appropriate.

Share Price and Distributions

Share Price

American Century Investments will price the fund shares you purchase, exchange or redeem based on the net asset value (NAV) next determined after your order is received in good order by the fund’s transfer agent, or other financial intermediary with the authority to accept orders on the fund’s behalf. We determine the NAV of the fund as of the close of regular trading (usually 4 p.m. Eastern time) on the New York Stock Exchange (NYSE) on each day the NYSE is open. On days when the NYSE is closed (including certain U.S. national holidays), we do not calculate the NAV.


			The net asset value, or NAV, of each class of the fund is the current value of the class’s assets, minus any liabilities, divided by the number of shares of the class outstanding.

Readily available market quotations for fixed income securities shall generally be received from independent pricing services that have been approved by the Board. It is anticipated that such pricing services will generally provide evaluated prices based on accepted industry conventions. Evaluated prices are commonly derived through utilization of market models. Such models take into consideration various market factors and security characteristics. These may include, but are not limited to, the following: trade data, quotations from broker-dealers and active market makers, relevant yield curve and spread data, related sector levels, creditworthiness, trade data or market information on comparable securities and other relevant security specific information. Debt obligations with 60 days or less remaining until maturity may be valued at amortized cost.

If the fund determines that the market price for a portfolio security is not readily available or that the valuation methods mentioned above do not reflect the security’s fair value, such security is valued as determined in good faith by the fund’s board or its designee, in accordance with procedures adopted by the fund’s board. Circumstances that may cause the fund to use alternate procedures to value a security include, but are not limited to:

•if, after the close of the foreign exchange on which a portfolio security is principally traded, but before the close of the NYSE, an event occurs that may materially affect the value of the security;

•a debt security has been declared in default; or

•trading in a security has been halted during the trading day.

If such circumstances occur, the fund will fair value the security if the fair valuation would materially impact the fund’s NAV. While fair value determinations involve judgments that are inherently subjective, these determinations are made in good faith in accordance with procedures adopted by the fund’s board.

The effect of using fair value determinations is that the fund’s NAV will be based, to some degree, on security valuations that the board or its designee believes are fair rather than being solely determined by the market.

With respect to any portion of the fund’s assets that are invested in one or more open-end management investment companies that are registered with the SEC (known as registered investment companies), the fund’s NAV will be calculated based upon the NAVs of such registered investment companies. These registered investment companies are required by law to explain the circumstances under which they will use fair value pricing and the effects of using fair value pricing in their prospectuses.

Securities and other assets quoted in foreign currencies are valued in U.S. dollars based on the prevailing exchange rates at the time the fund’s NAV is determined.

Trading of securities in foreign markets may not take place every day the NYSE is open. Also, trading in some foreign markets and on some electronic trading networks may take place on weekends or holidays when the fund’s NAV is not calculated. So, the value of the fund’s portfolio may be affected on days when you will not be able to purchase, exchange or redeem fund shares.

Distributions

Federal tax laws require the fund to make distributions to its shareholders in order to qualify for treatment as a regulated investment company. Qualification for treatment as a regulated investment company means that the fund will not be subject to state or federal income tax on amounts distributed. The distributions generally consist of dividends and interest received by the fund, as well as capital gains realized by the fund on the sale of its investment securities.


			Capital gains are increases in the values of capital assets, such as stocks or bonds, from the time the assets are purchased.

The fund generally expects to declare distributions from net income, if any, daily. These distributions are paid on the last day of the month. The fund generally pays distributions from capital gains, if any, once a year in December. The fund may make more frequent distributions, if necessary, to comply with Internal Revenue Code provisions.

You will participate in fund distributions when they are declared, starting the next business day after your purchase is effective. For example, if you purchase shares on a day that a distribution is declared, you will not receive that distribution. If you redeem shares, you will receive any distribution declared on the day you redeem. If you redeem all shares, we will include any distributions received with your redemption proceeds.

Generally, participants in tax-deferred retirement plans reinvest all distributions. For investors investing through taxable accounts, we will reinvest distributions unless you elect to have dividends and/or capital gains sent to another American Century Investments account, to your bank electronically, or to your home address or to another person or address by check.

Taxes

Some of the tax consequences of owning shares of a fund will vary depending on whether you own them through a taxable or tax-deferred account. Distributions by a fund of dividend and interest income, capital gains and other income it has generated through its investment activities will generally be taxable to shareholders who hold shares in a taxable account. Tax consequences also may result when investors sell fund shares after the net asset value has increased or decreased.

Tax-Deferred Accounts

If you purchase fund shares through a tax-deferred account, such as an IRA or employer-sponsored retirement or savings plan, income and capital gains distributions usually will not be subject to current taxation but will accumulate in your account under the plan on a tax-deferred basis. Likewise, moving from one fund to another fund within a plan or tax-deferred account generally will not cause you to be taxed. For information about the tax consequences of making purchases or withdrawals through a tax-deferred account, please consult your plan administrator, your summary plan description or a tax advisor.

Taxable Accounts

If you own fund shares through a taxable account, you may be taxed on your investments if the fund makes distributions or if you sell your fund shares.

Taxability of Distributions

Fund distributions may consist of income, such as dividends and interest earned by the fund from its investments, or capital gains generated by the fund from the sale of its investment securities. Distributions of income are taxed as ordinary income, unless they are designated as qualified dividend income and you meet a minimum required holding period with respect to your shares of the fund, in which case they are taxed at the same rates as long-term capital gains. The fund does not expect a significant portion of its distributions to be derived from qualified dividend income.


			Qualified dividend income is a dividend received by a fund from the stock of a domestic or qualifying foreign corporation, provided that the fund has held the stock for a required holding period and the stock was not on loan at the time of the dividend.

The tax character of any distributions from capital gains is determined by how long the fund held the underlying security that was sold, not by how long you have been invested in the fund, or whether you reinvest your distributions or take them in cash. Short-term (one year or less) capital gains are taxable as ordinary income. Gains on securities held for more than one year are taxed at the lower rates applicable to long-term capital gains.

If the fund’s distributions exceed current and accumulated earnings and profits, such excess will generally be considered a return of capital. A return of capital distribution is generally not subject to tax, but will reduce your cost basis in the fund and result in higher realized capital gains (or lower realized capital losses) upon the sale of fund shares.

For taxable accounts, American Century Investments or your financial intermediary will inform you of the tax character of fund distributions for each calendar year in an annual tax mailing.

If you meet specified income levels, you will also be subject to a 3.8% Medicare contribution tax which is imposed on net investment income, including interest, dividends and capital gains. Distributions also may be subject to state and local taxes. Because everyone’s tax situation is unique, you may want to consult your tax professional about federal, state and local tax consequences.

Taxes on Transactions

Your redemptions — including exchanges to other American Century Investments funds — are subject to capital gains tax. Short-term capital gains are gains on fund shares you held for 12 months or less. Long-term capital gains are gains on fund shares you held for more than 12 months. If your shares decrease in value, their sale or exchange will result in a long-term or short-term capital loss. However, you should note that loss realized upon the sale or exchange of shares held for six months or less will be treated as a long-term capital loss to the extent of any distribution of long-term capital gain to you with respect to those shares. If a loss is realized on the redemption of fund shares, the reinvestment in additional fund shares within 30 days before or after the redemption may be subject to the wash sale rules of the Internal Revenue Code. This may result in a postponement of the recognition of such loss for federal income tax purposes.

If you have not certified to us that your Social Security number or tax identification number is correct and that you are not subject to withholding, we are required to withhold and pay to the IRS the applicable federal withholding tax rate on taxable dividends, capital gains distributions and redemption proceeds.

Buying a Dividend

Purchasing fund shares in a taxable account shortly before a distribution is sometimes known as buying a dividend. In taxable accounts, you must pay income taxes on the distribution whether you reinvest the distribution or take it in cash. In addition, you will have to pay taxes on the distribution whether the value of your investment decreased, increased or remained the same after you bought the fund shares.

The risk in buying a dividend is that the fund’s portfolio may build up taxable income and gains throughout the period covered by a distribution, as income is earned and securities are sold at a profit. The fund distributes the income and gains to you, after subtracting any losses, even if you did not own the shares when the income was earned or the gains occurred.

If you buy a dividend, you incur the full tax liability of the distribution period, but you may not enjoy the full benefit of the income earned or the gains realized in the fund’s portfolio.

Multiple Class Information

The fund offers multiple classes of shares. The classes have different fees, expenses, eligibility requirements and/or minimum investment requirements. Different fees and expenses will affect performance.

Except as described below, all classes of shares of the fund have identical voting, dividend, liquidation and other rights, preferences, terms and conditions. The only differences among the classes are (a) each class may be subject to different expenses specific to that class; (b) each class has a different identifying designation or name; (c) each class has exclusive voting rights with respect to matters solely affecting such class; (d) each class may have different exchange privileges; (e) the I Class may provide for conversion from that class into shares of the Investor Class of the same fund; and (f) the C Class provides for automatic conversion from that class into shares of the A Class of the same fund after 8 years.

Service, Distribution and Administrative Fees

Investment Company Act Rule 12b-1 permits mutual funds that adopt a written plan to pay certain expenses associated with the distribution of their shares out of fund assets. The fund’s A Class, C Class and R Class each have a 12b-1 plan. The plans provide for the fund to pay annual fees of 0.25% for A Class, 1.00% for C Class and 0.50% for R Class to the distributor for distribution and individual shareholder services, including past distribution services. The distributor pays all or a portion of such fees to the financial intermediaries that make the classes available. Because these fees may be used to pay for services that are not related to prospective sales of the fund, each class will continue to make payments under its plan even if it is closed to new investors. Because these fees are paid out of the fund’s assets on an ongoing basis, over time these fees will increase the cost of your investment and may cost you more than paying other types of sales charges. The higher fees for C Class shares may cost you more over time than paying the initial sales charge for A Class shares. For additional information about the plans and their terms, see Multiple Class Structure in the statement of additional information.

Certain financial intermediaries perform recordkeeping and administrative services for their clients that would otherwise be performed by American Century Investments’ transfer agent. In some circumstances, the advisor will pay such service providers a fee for performing those services. Also, the advisor and the fund’s distributor may make payments to intermediaries for various additional services, other expenses and/or the intermediaries’ distribution of the fund out of their profits or other available sources. Such payments may be made for one or more of the following: (1) distribution, which may include expenses incurred by intermediaries for their sales activities with respect to the fund, such as preparing, printing and distributing sales literature and advertising materials and compensating registered representatives or other employees of such financial intermediaries for their sales activities, as well as the opportunity for the fund to be made available by such intermediaries; (2) shareholder services, such as providing individual and custom investment advisory services to clients of the financial intermediaries; and (3) marketing and promotional services, including business planning assistance, educating personnel about the fund, and sponsorship of sales meetings, which may include covering costs of providing speakers, meals and other entertainment. The distributor may pay partnership and/or sponsorship fees to support seminars, conferences, and other programs designed to educate intermediaries about the fund and may cover the expenses associated with attendance at such meetings, including travel costs. The distributor also may pay fees related to obtaining data regarding intermediary or financial advisor activities to assist American Century Investments with sales reporting, business intelligence, and training and education opportunities. These payments and activities are intended to provide an incentive to intermediaries to sell the fund by educating them about the fund and helping defray the costs associated with offering the fund. These payments may create a conflict of interest by influencing the intermediary to recommend the fund over another investment. Ask your salesperson or visit your financial intermediary’s website for more information. The amount of any payments described by this paragraph is determined by the advisor or the distributor, and all such amounts are paid out of their available assets, and not paid by you or the fund. As a result, the total expense ratio of the fund will not be affected by any such payments.

American Century Investments does not pay any fees to financial intermediaries on Y, R6 or G Class shares.

Financial Highlights

Understanding the Financial Highlights

The table on the next page itemizes what contributed to the changes in share price during the most recently ended fiscal year. It also shows the changes in share price for this period in comparison to changes over the last five fiscal years (or a shorter period if the share class is not five years old).

On a per-share basis, the table includes as appropriate

•share price at the beginning of the period

•investment income and capital gains or losses

•distributions of income and capital gains paid to investors

•share price at the end of the period

The table also includes some key statistics for the period as appropriate

•Total Return – the overall percentage of return of the fund, assuming the reinvestment of all distributions

•Expense Ratio – the operating expenses of the fund as a percentage of average net assets

•Net Income Ratio – the net investment income of the fund as a percentage of average net assets

•Portfolio Turnover – the percentage of the fund’s investment portfolio that is replaced during the period

The Financial Highlights that follow have been audited by PricewaterhouseCoopers LLP, independent registered public accounting firm. Their Report of Independent Registered Public Accounting Firm and the financial statements are included in the fund’s annual report, which is available upon request.

Emerging Markets Debt Fund


For a Share Outstanding Throughout the Years Ended October 31 (except as noted)
Per-Share Data										Ratios and Supplemental Data
		Income From Investment Operations:			Distributions From:					Ratio to Average Net Assets of:
	Net Asset Value, Beginning of Period	Net Investment Income, (Loss)(1)	Net Realized and Unrealized Gain (Loss)	Total From Investment Operations	Net Investment Income	Net Realized Gains	Total Distributions	Net Asset Value, End of Period	Total Return(2)	Operating Expenses	Net Investment Income (Loss)	Portfolio Turnover Rate	Net Assets, End of Period (in thousands)
Investor Class
2020	$10.46	0.39	(0.16)	0.23	(0.37)	—	(0.37)	$10.32	2.34%	0.97%	3.83%	68%	$89,509
2019	$9.79	0.43	0.66	1.09	(0.42)	—	(0.42)	$10.46	11.35%	0.97%	4.24%	75%	$92,647
2018	$10.43	0.35	(0.64)	(0.29)	(0.33)	(0.02)	(0.35)	$9.79	(2.76)%	0.97%	3.52%	85%	$90,831
2017	$10.32	0.35	0.16	0.51	(0.34)	(0.06)	(0.40)	$10.43	5.11%	0.97%	3.39%	154%	$6,634
2016	$9.75	0.36	0.57	0.93	(0.36)	—	(0.36)	$10.32	9.77%	0.97%	3.59%	97%	$3,898
I Class
2020	$10.46	0.40	(0.16)	0.24	(0.38)	—	(0.38)	$10.32	2.44%	0.87%	3.93%	68%	$1,887
2019	$9.79	0.44	0.66	1.10	(0.43)	—	(0.43)	$10.46	11.47%	0.87%	4.34%	75%	$1,932
2018	$10.44	0.34	(0.63)	(0.29)	(0.34)	(0.02)	(0.36)	$9.79	(2.76)%	0.87%	3.62%	85%	$6
2017(3)	$10.30	0.20	0.14	0.34	(0.20)	—	(0.20)	$10.44	3.28%	0.87%(4)	3.38%(4)	154%(5)	$38
Y Class
2020	$10.46	0.41	(0.16)	0.25	(0.39)	—	(0.39)	$10.32	2.55%	0.77%	4.03%	68%	$18,475
2019	$9.79	0.45	0.66	1.11	(0.44)	—	(0.44)	$10.46	11.57%	0.77%	4.44%	75%	$11,393
2018	$10.44	0.40	(0.68)	(0.28)	(0.35)	(0.02)	(0.37)	$9.79	(2.67)%	0.77%	3.72%	85%	$3,218
2017(3)	$10.30	0.21	0.13	0.34	(0.20)	—	(0.20)	$10.44	3.33%	0.77%(4)	3.52%(4)	154%(5)	$5
A Class
2020	$10.45	0.37	(0.16)	0.21	(0.35)	—	(0.35)	$10.31	2.08%	1.22%	3.58%	68%	$363
2019	$9.78	0.40	0.66	1.06	(0.39)	—	(0.39)	$10.45	11.08%	1.22%	3.99%	75%	$316
2018	$10.43	0.28	(0.60)	(0.32)	(0.31)	(0.02)	(0.33)	$9.78	(3.11)%	1.22%	3.27%	85%	$164
2017	$10.32	0.32	0.17	0.49	(0.32)	(0.06)	(0.38)	$10.43	4.84%	1.22%	3.14%	154%	$6,619
2016	$9.74	0.33	0.59	0.92	(0.34)	—	(0.34)	$10.32	9.61%	1.22%	3.34%	97%	$6,282
C Class
2020	$10.44	0.29	(0.17)	0.12	(0.27)	—	(0.27)	$10.29	1.23%	1.97%	2.83%	68%	$41
2019	$9.77	0.33	0.66	0.99	(0.32)	—	(0.32)	$10.44	10.26%	1.97%	3.24%	75%	$47
2018	$10.41	0.20	(0.59)	(0.39)	(0.23)	(0.02)	(0.25)	$9.77	(3.74)%	1.97%	2.52%	85%	$32
2017	$10.30	0.25	0.16	0.41	(0.24)	(0.06)	(0.30)	$10.41	4.07%	1.97%	2.39%	154%	$1,144
2016	$9.72	0.26	0.58	0.84	(0.26)	—	(0.26)	$10.30	8.81%	1.97%	2.59%	97%	$1,110


For a Share Outstanding Throughout the Years Ended October 31 (except as noted)
Per-Share Data										Ratios and Supplemental Data
		Income From Investment Operations:			Distributions From:					Ratio to Average Net Assets of:
	Net Asset Value, Beginning of Period	Net Investment Income, (Loss)(1)	Net Realized and Unrealized Gain (Loss)	Total From Investment Operations	Net Investment Income	Net Realized Gains	Total Distributions	Net Asset Value, End of Period	Total Return(2)	Operating Expenses	Net Investment Income (Loss)	Portfolio Turnover Rate	Net Assets, End of Period (in thousands)
R Class
2020	$10.45	0.34	(0.17)	0.17	(0.32)	—	(0.32)	$10.30	1.84%	1.47%	3.33%	68%	$139
2019	$9.78	0.38	0.66	1.04	(0.37)	—	(0.37)	$10.45	10.80%	1.47%	3.74%	75%	$88
2018	$10.42	0.26	(0.60)	(0.34)	(0.28)	(0.02)	(0.30)	$9.78	(3.26)%	1.47%	3.02%	85%	$56
2017	$10.31	0.30	0.16	0.46	(0.29)	(0.06)	(0.35)	$10.42	4.58%	1.47%	2.89%	154%	$1,205
2016	$9.73	0.31	0.58	0.89	(0.31)	—	(0.31)	$10.31	9.34%	1.47%	3.09%	97%	$1,120
R5 Class
2020	$10.46	0.41	(0.16)	0.25	(0.39)	—	(0.39)	$10.32	2.56%	0.77%	4.03%	68%	$8
2019	$9.79	0.45	0.66	1.11	(0.44)	—	(0.44)	$10.46	11.59%	0.77%	4.44%	75%	$7
2018	$10.43	0.31	(0.57)	(0.26)	(0.36)	(0.02)	(0.38)	$9.79	(2.55)%	0.77%	3.72%	85%	$7
2017	$10.32	0.37	0.16	0.53	(0.36)	(0.06)	(0.42)	$10.43	5.31%	0.77%	3.59%	154%	$5,986
2016	$9.75	0.38	0.57	0.95	(0.38)	—	(0.38)	$10.32	9.99%	0.77%	3.79%	97%	$5,682
R6 Class
2020	$10.46	0.42	(0.16)	0.26	(0.40)	—	(0.40)	$10.32	2.60%	0.72%	4.08%	68%	$1,958
2019	$9.79	0.46	0.66	1.12	(0.45)	—	(0.45)	$10.46	11.62%	0.72%	4.49%	75%	$10,229
2018	$10.44	0.37	(0.64)	(0.27)	(0.36)	(0.02)	(0.38)	$9.79	(2.61)%	0.72%	3.77%	85%	$9,336
2017	$10.33	0.38	0.16	0.54	(0.37)	(0.06)	(0.43)	$10.44	5.37%	0.72%	3.64%	154%	$16,492
2016	$9.75	0.38	0.59	0.97	(0.39)	—	(0.39)	$10.33	10.15%	0.72%	3.84%	97%	$15,465
G Class
2020	$10.46	0.49	(0.16)	0.33	(0.47)	—	(0.47)	$10.32	3.33%	0.01%(6)	4.79%(6)	68%	$435,472
2019	$9.79	0.53	0.66	1.19	(0.52)	—	(0.52)	$10.46	12.41%	0.01%(7)	5.20%(7)	75%	$266,091
2018(8)	$10.40	0.44	(0.62)	(0.18)	(0.41)	(0.02)	(0.43)	$9.79	(1.59)%	0.01%(4)(9)	4.49%(4)(9)	85%(10)	$308,199


Notes to Financial Highlights

(1)Computed using average shares outstanding throughout the period.

(2)Total returns are calculated based on the net asset value of the last business day and do not reflect applicable sales charges, if any. Total returns for periods less than one year are not annualized.

(3)April 10, 2017 (commencement of sale) through October 31, 2017.

(4)Annualized.

(5)Portfolio turnover is calculated at the fund level. Percentage indicated was calculated for the year ended October 31, 2017.

(6)The ratio of operating expenses to average net assets before expense waiver and the ratio of net investment income (loss) to average net assets before expense waiver was 0.72% and 4.08%, respectively.

(7)The ratio of operating expenses to average net assets before expense waiver and the ratio of net investment income (loss) to average net assets before expense waiver was 0.72% and 4.49%, respectively.

(8)November 14, 2017 (commencement of sale) through October 31, 2018.

(9)The annualized ratio of operating expenses to average net assets before expense waiver and the annualized ratio of net investment income (loss) to average net assets before expense waiver was 0.72% and 3.78%, respectively.

(10)Portfolio turnover is calculated at the fund level. Percentage indicated was calculated for the year ended October 31, 2018.

Appendix A

The information in this Appendix is part of, and incorporated into, the fund’s prospectus.

Financial Intermediary Sales Charge Reduction and Waiver Information

The availability of certain sales charge waivers and discounts will depend on whether you purchase your shares directly from the fund or through a financial intermediary. Intermediaries may have different policies and procedures regarding the availability of front-end sales load waivers or contingent deferred (back-end) sales load (CDSC) waivers, which are set forth below. In all instances, it is the investor’s responsibility to notify the fund or the applicable financial intermediary at the time of purchase of any relationship or other facts qualifying the investor for sales charge waivers or discounts. For waivers and discounts not available through a particular intermediary, shareholders will have to purchase fund shares directly from the fund or through another intermediary to receive these waivers or discounts.

Sales Charge Reductions and Waivers Available through Ameriprise Financial

The following information applies to A Class shares purchases if you have an account with or otherwise purchase fund shares through Ameriprise Financial.

Shareholders purchasing fund shares through an Ameriprise Financial brokerage account are eligible for the following front-end sales charge waivers, which may differ from those disclosed elsewhere in this fund’s prospectus or SAI:

•Employer-sponsored retirement plans (e.g., 401(k) plans, 457 plans, employer-sponsored 403(b) plans, profit sharing and money purchase pension plans and defined benefit plans). For purposes of this provision, employer-sponsored retirement plans do not include SEP IRAs, Simple IRAs or SAR-SEPs.

•Shares purchased through reinvestment of capital gains distributions and dividend reinvestment when purchasing shares of the same fund (but not any other fund within the same fund family).

•Shares exchanged from C Class shares of the same fund in the month of or following the 7-year anniversary of the purchase date. To the extent that this prospectus elsewhere provides for a waiver with respect to exchanges of C Class shares or conversion of C Class shares following a shorter holding period, that waiver will apply.

•Employees and registered representatives of Ameriprise Financial or its affiliates and their immediate family members.

•Shares purchased by or through qualified accounts (including IRAs, Coverdell Education Savings Accounts, 401(k)s, 403(b) TSCAs subject to ERISA and defined benefit plans) that are held by a covered family member, defined as an Ameriprise financial advisor and/or the advisor’s spouse, advisor’s lineal ascendant (mother, father, grandmother, grandfather, great grandmother, great grandfather), advisor’s lineal descendant (son, step-son, daughter, step-daughter, grandson, granddaughter, great grandson, great granddaughter) or any spouse of a covered family member who is a lineal descendant.

•Shares purchased from the proceeds of redemptions within the same fund family, provided (1) the repurchase occurs within 90 days following the redemption, (2) the redemption and purchase occur in the same account, and (3) redeemed shares were subject to a front-end or deferred sales load (i.e. Rights of Reinstatement).

Sales Charge Reductions and Waivers Available through Baird

Effective June 15, 2020, shareholders purchasing fund shares through a Baird platform or account will only be eligible for the following sales charge waivers (front-end sales charge waivers and CDSC waivers) and discounts, which may differ from those disclosed elsewhere in this prospectus or the SAI.

Front-End Sales Charge Waivers on Investors A-shares Available at Baird

•Shares purchased through reinvestment of capital gains distributions and dividend reinvestment when purchasing share of the same fund

•Share purchase by employees and registered representatives of Baird or its affiliate and their family members as designated by Baird

•Shares purchase from the proceeds of redemptions from another American Century Investments fund, provided (1) the repurchase occurs within 90 days following the redemption, (2) the redemption and purchase occur in the same accounts, and (3) redeemed shares were subject to a front-end or deferred sales charge (known as rights of reinstatement)

•A shareholder in the funds' Investor C Shares will have their share converted at net asset value to Investor A shares of the fund if the shares are no longer subject to CDSC and the conversion is in line with the policies and procedures of Baird

A-1

•Employer-sponsored retirement plans or charitable accounts in a transactional brokerage account at Baird, including 401(k) plans, 457 plans, employer-sponsored 403(b) plans, profit sharing and money purchase pension plans and defined benefit plans. For purposes of this provision, employer-sponsored retirement plans do not include SEP IRAs, Simple IRAs or SAR-SEPs

CDSC Waivers on Investor A and C shares Available at Baird

•Shares sold due to death or disability of the shareholder

•Shares sold as part of a systematic withdrawal plan as described in the fund’s prospectus

•Shares bought due to returns of excess contributions from an IRA Account

•Shares sold as part of a required minimum distribution for IRA and retirement accounts due to the shareholder reaching the qualified age based on applicable IRS regulations as described in the prospectus.

•Shares sold to pay Baird fees but only if the transaction is initiated by Baird

•Shares acquired through a right of reinstatement

Front-End Sales Charge Discounts Available at Baird: Breakpoints and/or Rights of Accumulations

•Breakpoints as described in this prospectus

•Rights of accumulations which entitles shareholders to breakpoint discounts will be automatically calculated based on the aggregated holding of American Century Investments assets held by accounts within the purchaser’s household at Baird. Eligible American Century Investments assets not held at Baird may be included in the rights of accumulations calculation only if the shareholder notifies his or her financial advisor about such assets

•Letters of Intent (LOI) allow for breakpoint discounts based on anticipated purchases of American Century Investments funds through Baird, over a 13-month period of time

Sales Waivers and Reductions in Sales Charges for Edward Jones

Effective on or after May 1, 2020, clients of Edward Jones (also referred to as "shareholders") purchasing fund shares on the Edward Jones commission and fee-based platforms are eligible only for the following sales charge discounts (also referred to as "breakpoints") and waivers, which can differ from breakpoints and waivers described elsewhere in the mutual fund prospectus or SAI or through another broker-dealer.In all instances, it is the shareholder's responsibility to inform Edward Jones at the time of purchase of any relationship, holdings of American Century or other facts qualifying the purchaser for breakpoints or waivers. Edward Jones can ask for documentation of such circumstance.

Breakpoints

Rights of Accumulation (ROA)

•The applicable sales charge on a purchase of A Class shares is determined by taking into account all share classes (except any money market funds and retirement plan share classes) of American Century held by the shareholder or in an account grouped by Edward Jones with other accounts for the purpose of providing certain pricing considerations ("pricing groups"). This includes all share classes held on the Edward Jones platform and/or held on another platform. The inclusion of eligible fund family assets in the rights of accumulation calculation is dependent on the shareholder notifying his or her financial advisor of such assets at the time of calculation.

•ROA is determined by calculating the higher of cost or market value (current shares x NAV).

Letter of Intent (LOI)

•Through a LOI, shareholders can receive the sales charge and breakpoint discounts for purchases shareholders intend to make over a 13-month period from the date Edward Jones receives the LOI. The LOI is determined by calculating the higher of cost or market value of qualifying holdings at LOI initiation in combination with the value that the shareholder intends to buy over a 13-month period to calculate the front-end sales charge and any breakpoint discounts. Each purchase the shareholder makes during that 13-month period will receive the sales charge and breakpoint discount that applies to the total amount. The inclusion of eligible fund family assets in the LOI calculation is dependent on the shareholder notifying his or her financial advisor of such assets at the time of calculation. Purchases made before the LOI is received by Edward Jones are not covered under the LOI and will not reduce the sales charge previously paid. Sales charges will be adjusted if LOI is not met.

Sales Charge Waivers

Sales charges are waived for the following shareholders and in the following situations:

•Associates of Edward Jones and its affiliates and their family members who are in the same pricing group (as determined by Edward Jones under its policies and procedures) as the associate. This waiver will continue for the remainder of the associate's life if the associate retires from Edward Jones in good-standing.

A-2

•Shares purchased in an Edward Jones fee-based program.

•Shares purchased through reinvestment of capital gains distributions and dividend reinvestment.

•Shares purchased from the proceeds of redeemed shares of the same fund family so long as the following conditions are met: 1) the proceeds are from the sale of shares within 60 days of the purchase, and 2) the sale and purchase are made in the same share class and the same account or the purchase is made in an individual retirement account with proceeds from liquidations in a non-retirement account.

•Shares exchanged into A Class shares from another share class so long as the exchange is into the same fund and was initiated at the discretion of Edward Jones. Edward Jones is responsible for any remaining CDSC due to the fund company, if applicable. Any future purchases are subject to the applicable sales charge as disclosed in the prospectus.

•Exchanges from class C shares to class A shares of the same fund, generally, in the 84th month following the anniversary of the purchase date or earlier at the discretion of Edward Jones.

Contingent Deferred Sales Charge (CDSC) Waivers

If the shareholder purchases shares that are subject to a CDSC and those shares are redeemed before the CDSC is expired, the shareholder is responsible to pay the CDSC except in the following conditions:

•The death or disability of the shareholder

•Systematic withdrawals with up to 10% per year of the account value

•Return of excess contributions from an Individual Retirement Account (IRA)

•Shares sold as part of a required minimum distribution for IRA and retirement accounts if the redemption is taken in or after the year the shareholder reaches qualified age based on applicable IRS regulations

•Shares sold to pay Edward Jones fees or costs in such cases where the transaction is initiated by Edward Jones

•Shares exchanged in an Edward Jones fee-based program

•Shares acquired through NAV reinstatement

Other Important Information

1.1 Minimum Purchase Amounts

•$250 initial purchase minimum

•$50 subsequent purchase minimum

1.2 Minimum Balances

•Edward Jones has the right to redeem at its discretion fund holdings with a balance of $250 or less. The following are examples of accounts that are not included in this policy:

◦A fee-based account held on an Edward Jones platform

◦A 529 account held on an Edward Jones platform

◦An account with an active systematic investment plan or letter of intent (LOI)

1.3 Changing Share Classes

•At any time it deems necessary, Edward Jones has the authority to exchange at NAV a shareholder's holdings in a fund to Class A shares.

Sales Charge Reductions and Waivers Available through Janney Montgomery Scott LLC (Janney)

Effective May 1, 2020, if you purchase fund shares through a Janney Montgomery Scott LLC (“Janney”) brokerage account, you will be eligible for the following load waivers (front-end sales charge waivers and contingent deferred sales charge (“CDSC”), or back-end sales charge, waivers) and discounts, which may differ from those disclosed elsewhere in this fund’s Prospectus or SAI.

Front-end sales charge* waivers on A Class shares available at Janney

•Shares purchased through reinvestment of capital gains distributions and dividend reinvestment when purchasing shares of the same fund (but not any other fund within the fund family).

•Shares purchased by employees and registered representatives of Janney or its affiliates and their family members as designated by Janney.

•Shares purchased from the proceeds of redemptions within the same fund family, provided (1) the repurchase occurs within ninety (90) days following the redemption, (2) the redemption and purchase occur in the same account, and (3) redeemed shares were subject to a front-end or deferred sales load (i.e., right of reinstatement).

•Employer-sponsored retirement plans (e.g., 401(k) plans, 457 plans, employer-sponsored 403(b) plans, profit sharing and

A-3

money purchase pension plans and defined benefit plans). For purposes of this provision, employer-sponsored retirement plans do not include SEP IRAs, Simple IRAs, SAR-SEPs or Keogh plans.

•Shares acquired through a right of reinstatement.

•C Class shares that are no longer subject to a contingent deferred sales charge and are converted to A Class shares of the same fund pursuant to Janney’s policies and procedures.

CDSC waivers on A and C Class shares available at Janney

•Shares sold upon the death or disability of the shareholder.

•Shares sold as part of a systematic withdrawal plan as described in the fund’s prospectus.

•Shares purchased in connection with a return of excess contributions from an IRA account.

•Shares sold as part of a required minimum distribution for IRA and other retirement accounts if the redemption is taken in or after the year the shareholder reaches qualified age based on applicable IRS regulations.

•Shares sold to pay Janney fees but only if the transaction is initiated by Janney.

•Shares acquired through a right of reinstatement.

•Shares exchanged into the same share class of a different fund.

Front-end sales charge* discounts available at Janney: breakpoints, rights of accumulation, and/or letters of intent

•Breakpoints as described in the fund’s prospectus.

•Rights of accumulation (ROA), which entitle shareholders to breakpoint discounts, will be automatically calculated based on the aggregated holding of fund family assets held by accounts within the purchaser’s household at Janney. Eligible fund family assets not held at Janney may be included in the ROA calculation only if the shareholder notifies his or her financial advisor about such assets.

•Letters of intent which allow for breakpoint discounts based on anticipated purchases within a fund family, over a 13-month time period. Eligible fund family assets not held at Janney Montgomery Scott may be included in the calculation of letters of intent only if the shareholder notifies his or her financial advisor about such assets.

*Also referred to as an “initial sales charge.”

Sales Charge Reductions and Waivers Available through Merrill Lynch

Shareholders purchasing fund shares through a Merrill Lynch platform or account will be eligible only for the following load waivers (front-end sales charge waivers and contingent deferred, or back-end, sales charge waivers) and discounts, which may differ from those disclosed elsewhere in this fund’s prospectus or SAI.

Front-end Sales Load Waivers on A Class Shares available at Merrill Lynch

•Employer-sponsored retirement, deferred compensation and employee benefit plans (including health savings accounts) and trusts used to fund those plans, provided that the shares are not held in a commission-based brokerage account and shares are held for the benefit of the plan

•Shares purchased by a 529 Plan (does not include 529-specific share classes or equivalents)

•Shares purchased through a Merrill Lynch affiliated investment advisory program

•Shares exchanged due to the holdings moving from a Merrill Lynch affiliated investment advisory program to a Merrill Lynch brokerage (non-advisory) account pursuant to Merrill Lynch’s policies relating to sales load discounts and waivers

•Shares purchased by third party investment advisors on behalf of their advisory clients through Merrill Lynch’s platform

•Shares of funds purchased through the Merrill Edge Self-Directed platform] (if applicable)

•Shares purchased through reinvestment of capital gains distributions and dividend reinvestment when purchasing shares of the same fund (but not any other fund within the fund family)

•Shares exchanged from C Class (i.e. level-load) shares of the same fund pursuant to Merrill Lynch’s policies relating to sales load discounts and waivers

•Employees and registered representatives of Merrill Lynch or its affiliates and their family members

•Directors or trustees of the fund, and employees of the fund’s investment advisor or any of its affiliates, as described in this prospectus

•Eligible shares purchased from the proceeds of redemptions within the American Century Investments family of mutual funds, provided (1) the repurchase occurs within 90 days following the redemption, (2) the redemption and purchase occur in the same account, and (3) redeemed shares were subject to a front-end or deferred sales load (known as Rights of Reinstatement)

A-4

Automated transactions (i.e. systematic purchases and withdrawals) and purchases made after shares are automatically sold to pay Merrill Lynch’s account maintenance fees are not eligible for reinstatement

CDSC Waivers on A and C Shares available at Merrill Lynch

•Death or disability of the shareholder

•Shares sold as part of a systematic withdrawal plan as described in the fund’s prospectus

•Return of excess contributions from an IRA Account

•Shares sold as part of a required minimum distribution for IRA and retirement accounts pursuant to the Internal Revenue Code

•Shares sold to pay Merrill Lynch fees but only if the transaction is initiated by Merrill Lynch

•Shares acquired through a right of reinstatement

•Shares held in retirement brokerage accounts, that are exchanged for a lower cost share class due to transfer to certain fee based accounts or platforms (applicable to A and C shares only)

•Shares received through an exchange due to the holdings moving from a Merrill Lynch affiliated investment advisory program to a Merrill Lynch brokerage (non-advisory) account pursuant to Merrill Lynch’s policies relating to sales load discounts and waivers

Front-end load Discounts Available at Merrill Lynch: Breakpoints, Rights of Accumulation & Letters of Intent

•Breakpoints as described in this prospectus.

•Rights of Accumulation (ROA) which entitle shareholders to breakpoint discounts as described in the fund's prospectus will be automatically calculated based on the aggregated holding of fund family assets held by accounts (including 529 program holdings, where applicable) within the purchaser’s household at Merrill Lynch. Eligible fund family assets not held at Merrill Lynch may be included in the ROA calculation only if the shareholder notifies his or her financial advisor about such assets

•Letters of Intent (LOI) which allow for breakpoint discounts based on anticipated purchases within a fund family, through Merrill Lynch, over a 13-month period of time (if applicable)

Sales Charge Reductions and Waivers available through Morgan Stanley Wealth Management

Effective July 1, 2018, shareholders purchasing fund shares through a Morgan Stanley Wealth Management transactional brokerage account will be eligible only for the following front-end sales charge waivers with respect to A Class shares, which may differ from and may be more limited than those disclosed elsewhere in this fund’s prospectus or SAI.

•Morgan Stanley employee and employee-related accounts according to Morgan Stanley’s account linking rules

•Shares purchased through reinvestment of dividends and capital gains distributions when purchasing shares of the same fund

•Shares purchased through a Morgan Stanley self-directed brokerage account

•C Class (i.e., level-load) shares that are no longer subject to a contingent deferred sales charge and are converted to A Class shares of the same fund pursuant to Morgan Stanley Wealth Management’s share class conversion program

•Shares purchased from the proceeds of redemptions within the American Century Investments family of mutual funds, provided (i) the repurchase occurs within 90 days following the redemption, (ii) the redemption and purchase occur in the same account, and (iii) redeemed shares were subject to a front-end or deferred sales charge.

Sales Charge Reductions and Waivers Available through Oppenheimer & Co. Inc. (OPCO)

Effective February 26, 2020, shareholders purchasing fund shares through an OPCO platform or account are eligible only for the following load waivers (front-end sales charge waivers and contingent deferred, or back-end, sales charge waivers) and discounts, which may differ from those disclosed elsewhere in this fund's prospectus or SAL

Front-end Sales Load Waivers on Class A Shares available at OPCO

•Shares purchased by or through a 529 Plan

•Shares purchased through an OPCO affiliated investment advisory program

A-5

•Shares purchased through reinvestment of capital gains distributions and dividend reinvestment when purchasing shares of the same fund (but not any other fund within the fund family)

•A shareholder in the fund's C Class shares will have their shares converted at net asset value to A Class shares (or the appropriate share class) of the fund if the shares are no longer subject to a CDSC and the conversion is in line with the policies and procedures of OPCO

•Employees and registered representatives of OPCO or its affiliates and their family members

•Directors or Trustees of the fund, and employees of the fund's investment adviser or any of its affiliates, as described in this prospectus

CDSC Waivers on A and C Shares available at OPCO

•Death or disability of the shareholder

•Shares sold as part of a systematic withdrawal plan as described in the fund's prospectus

•Return of excess contributions from an IRA

•Shares sold to pay OPCO fees but only if the transaction is initiated by OPCO

•Shares acquired through a right of reinstatement

Front-end load Discounts Available at OPCO: Breakpoints, Rights of Accumulation & Letters of Intent

•Breakpoints as described in this prospectus.

•Rights of Accumulation (ROA) which entitle shareholders to breakpoint discounts will be automatically calculated based on the aggregated holding of fund family assets held by accounts within the purchaser's household at OPCO. Eligible fund family assets not held at OPCO may be included in the ROA calculation only if the shareholder notifies his or her financial advisor about such assets

Raymond James & Associates, Inc., Raymond James Financial Services & each entity’s affiliates (“Raymond James”)

Effective March 1, 2019, shareholders purchasing fund shares through a Raymond James platform or account, or through an introducing broker-dealer or independent registered investment adviser for which Raymond James provides trade execution, clearance, and/or custody services, will be eligible only for the following load waivers (front-end sales charge waivers and contingent deferred, or back-end, sales charge waivers) and discounts, which may differ from those disclosed elsewhere in this fund’s prospectus or SAI.

Front-end sales load waivers on Class A shares available at Raymond James

•Shares purchased in an investment advisory program.

•Shares purchased within the same fund family through a systematic reinvestment of capital gains distributions and dividend reinvestment when purchasing shares of the same fund (but not any other fund within the American Century Investments fund family).

•Employees and registered representatives of Raymond James or its affiliates and their family members as designated by Raymond James.

•Shares purchased from the proceeds of redemptions within the American Century Investments fund family, provided (1) the repurchase occurs within 90 days following the redemption, (2) the redemption and purchase occur in the same account, and (3) redeemed shares were subject to a front-end or deferred sales load (known as Rights of Reinstatement).

•A shareholder in the fund’s C Class shares will have their shares converted at net asset value to A Class shares (or the appropriate share class) of the fund if the shares are no longer subject to a CDSC and the conversion is in line with the policies and procedures of Raymond James.

A-6

CDSC waivers on A and C Class shares available at Raymond James

•Death or disability of the shareholder.

•Shares sold as part of a systematic withdrawal plan as described in the fund’s prospectus.

•Return of excess contributions from an IRA Account.

•Shares sold to pay Raymond James fees but only if the transaction is initiated by Raymond James.

•Shares acquired through a right of reinstatement.

Front-end load discounts available at Raymond James: breakpoints, rights of accumulation, and/or letters of intent

•Breakpoints as described in this prospectus.

•Rights of accumulation which entitle shareholders to breakpoint discounts will be automatically calculated based on the aggregated holding of American Century Investments fund family assets held by accounts within the purchaser’s household at Raymond James. Eligible American Century Investments fund family assets not held at Raymond James may be included in the calculation of rights of accumulation only if the shareholder notifies his or her financial advisor about such assets.

•Letters of intent which allow for breakpoint discounts based on anticipated purchases within a fund family, over a 13-month time period. Eligible fund family assets not held at Raymond James may be included in the calculation of letters of intent only if the shareholder notifies his or her financial advisor about such assets.

Sales Charge Reductions and Waivers Available through Stifel, Nicolaus & Company, Incorporated (Stifel)

Effective July 1, 2020, shareholders purchasing fund shares through a Stifel platform or account or who own shares for which Stifel or an affiliate is the broker-dealer of record are eligible for the following additional sales charge waiver.

Front-end Sales Load Waiver on Class A Shares

•Class C shares that have been held for more than seven (7) years will be converted to Class A shares of the same Fund pursuant to Stifel’s policies and procedures

All other sales charge waivers and reductions described elsewhere in the fund’s prospectus or SAI still apply.

A-7

Notes

Where to Find More Information

Annual and Semiannual Reports

Additional information about the fund’s investments is available in the fund’s annual and semiannual reports to shareholders. In the fund’s annual report, you will find a discussion of the market conditions and investment strategies that significantly affected the fund’s performance during its last fiscal year. This prospectus incorporates by reference the Report of Independent Registered Public Accounting Firm and the financial statements included in the fund’s annual report to shareholders dated October 31, 2020.

Statement of Additional Information (SAI)

The SAI contains a more detailed legal description of the fund’s operations, investment restrictions, policies and practices. The SAI is incorporated by reference into this prospectus. This means that it is legally part of this prospectus, even if you don’t request a copy.

You may obtain a free copy of the SAI, annual reports and semiannual reports, and you may ask questions about the fund or your accounts, online at americancentury.com, by contacting American Century Investments at the addresses or telephone numbers listed below or by contacting your financial intermediary.

The Securities and Exchange Commission (SEC)

Reports and other information about the fund are available on the EDGAR database on the SEC’s website at sec.gov, and copies of this information may be obtained, after paying a duplicating fee, by electronic request at the following email address: publicinfo@sec.gov.

This prospectus shall not constitute an offer to sell securities of the fund in any state, territory, or other jurisdiction where the fund’s shares have not been registered or qualified for sale, unless such registration or qualification is not required, or under any circumstances in which such offer or solicitation would be unlawful.


American Century Investments americancentury.com
Retail Investors P.O. Box 419200 Kansas City, Missouri 64141-6200 1-800-345-2021 or 816-531-5575			Financial Professionals P.O. Box 419385 Kansas City, Missouri 64141-6385 1-800-345-6488

Investment Company Act File No. 811-06441

CL-PRS-92581 2103

March 1, 2021

American Century Investments

Prospectus

Global Bond Fund

Investor Class (AGBVX)

I Class (AGBHX)

Y Class (AGBWX)

A Class (AGBAX)

C Class (AGBTX)

R Class (AGBRX)

R5 Class (AGBNX)

R6 Class (AGBDX)

G Class (AGBGX)


The Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

Table of Contents


Fund Summary			2
Investment Objective			2
Fees and Expenses			2
Principal Investment Strategies			3
Principal Risks			4
Fund Performance			5
Portfolio Management			6
Purchase and Sale of Fund Shares			6
Tax Information			7
Payments to Broker-Dealers and Other Financial Intermediaries			7
Objectives, Strategies and Risks			8
Management			12
Investing Directly with American Century Investments			14
Investing Through a Financial Intermediary			16
Additional Policies Affecting Your Investment			21
Share Price and Distributions			26
Taxes			28
Multiple Class Information			30
Financial Highlights			31

Appendix A			A-1

Fund Summary

Investment Objective

The fund seeks long-term total return.

Fees and Expenses

The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for A Class sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Century Investments funds. More information about these and other discounts is available from your financial professional and in Calculation of Sales Charges on page 17 of the fund’s prospectus, Appendix A of the fund’s prospectus and Sales Charges in Appendix B of the statement of additional information.

Shareholder Fees (fees paid directly from your investment)

Investor

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

None

4.50%

None

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

None

None¹

1.00%

None

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

$25

None


Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
	Investor	I	Y	A	C	R	R5	R6	G
Management Fee	0.83%	0.73%	0.63%	0.83%	0.83%	0.83%	0.63%	0.58%	0.58%
Distribution and Service (12b-1) Fees	None	None	None	0.25%	1.00%	0.50%	None	None	None
Other Expenses	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%
Acquired Fund Fees and Expenses	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%
Total Annual Fund Operating Expenses	0.85%	0.75%	0.65%	1.10%	1.85%	1.35%	0.65%	0.60%	0.60%
Fee Waiver2	0.04%	0.04%	0.04%	0.04%	0.04%	0.04%	0.04%	0.04%	0.58%³
Total Annual Fund Operating Expenses After Fee Waiver	0.81%	0.71%	0.61%	1.06%	1.81%	1.31%	0.61%	0.56%	0.02%

1 Purchases of $1 million or more may be subject to a contingent deferred sales charge of 1.00% if the shares are redeemed within one year of the date of purchase.

2 The advisor has agreed to waive 0.04 percentage points of the fund’s management fee. The advisor expects this waiver to continue until February 28, 2022 and cannot terminate it prior to such date without the approval of the Board of Trustees.

3 The advisor has agreed to waive the G Class’s management fee in its entirety. The advisor expects this waiver to remain in effect permanently and cannot terminate it without the approval of the Board of Trustees.

Example


	1 year	3 years	5 years	10 years
Investor Class	$83	$268	$468	$1,046
I Class	$73	$236	$414	$927
Y Class	$62	$204	$359	$807
A Class	$553	$781	$1,026	$1,726
C Class	$184	$579	$998	$1,968
R Class	$134	$424	$736	$1,620
R5 Class	$62	$204	$359	$807
R6 Class	$57	$188	$331	$747
G Class	$2	$6	$11	$26

Portfolio Turnover

Principal Investment Strategies

The fund invests primarily in companies located in developed countries world-wide (including the United States), but may also invest in emerging markets. Under normal market conditions, the fund will invest at least 40% of its assets in foreign investments (unless the portfolio managers deem market conditions unfavorable, in which case the fund would invest at least 30% of its assets in foreign investments). The fund will allocate its assets among at least three different countries (one of which may be the United States).

The fund may invest up to 35% of its assets in high-yield securities. A high-yield security is one that has been rated below the four highest categories used by a nationally recognized statistical rating organization, or determined by the investment advisor to be of similar quality.

The advisor expects the fund’s dollar-weighted average maturity to be between two and 12 years.

The fund may invest in U.S. Treasury securities and securities of U.S. government agencies or instrumentalities such as the Government National Mortgage Association (Ginnie Mae), the Federal National Mortgage Association (Fannie Mae), the Federal Home Loan Mortgage Corporation (Freddie Mac), and the Federal Home Loan Bank (FHLB).

In addition to the debt securities described above, the fund may also invest in bank loans.

The fund also invests in derivative instruments. The fund may use foreign currency exchange contracts to shift its investment exposure from one currency into another, for hedging purposes or to enhance returns. The fund may invest in futures contracts, options and swap agreements to manage duration, credit exposure and country exposure. In certain foreign markets, swaps can also act as substitutes for other less liquid fixed-income instruments. The fund may also invest in collateralized debt obligations, including collateralized loan obligations, mortgage- or asset-backed securities and other similarly structured investments.

The fund may engage in active and frequent trading to achieve its principal investment strategies. This may cause higher transaction costs and may affect performance. It may also result in the realization and distribution of capital gains.

Principal Risks

•Credit Risk – Debt securities, even investment-grade debt securities, are subject to credit risk. Credit risk is the risk that the inability or perceived inability of the issuer to make interest and principal payments will cause the value of the securities to decrease. As a result the fund’s share price could also decrease. Changes in the credit rating of a debt security held by the fund could have a similar effect.

•Prepayment Risk – The fund may invest in debt securities backed by mortgages or other assets. If these underlying assets are prepaid, the fund may benefit less from declining interest rates than funds of similar maturity that invest less heavily in mortgage- and asset-backed securities.

•Emerging Market Risk – Investing in securities of companies located in emerging market countries generally is riskier than investing in securities of companies located in foreign developed countries. Emerging market countries may have unstable governments and/or economies that are subject to sudden change. These changes may be magnified by the countries’ emergent financial markets, resulting in significant volatility to investments in these countries. These countries also may lack the legal, business and social framework to support securities markets.

•LIBOR Transition Risk – The fund may invest in instruments that have variable or floating coupon rates based on the London Interbank Offered Rate (“LIBOR”). LIBOR is a benchmark interest rate intended to be representative of the rate at which certain major international banks lend to one another over short-terms. LIBOR will be phased out and the transition process to a replacement rate may lead to increased volatility or illiquidity in markets for instruments that rely on LIBOR. This could result in a change to the value of such instruments or a change in the cost of temporary borrowing for the fund.

•Counterparty Risk – If the fund enters into financial contracts, the fund will be subject to the credit risk presented by the counterparties.

•Principal Loss Risk – At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Fund Performance

Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown.

Calendar Year Total Returns

Highest Performance Quarter (2Q 2020): 4.28% Lowest Performance Quarter (1Q 2020): -3.13%


Average Annual Total Returns For the calendar year ended December 31, 2020	1 year	5 year	Since Inception	Inception Date
Investor Class Return Before Taxes	4.58%	4.05%	3.46%	01/31/2012
Return After Taxes on Distributions	4.22%	3.05%	2.30%	01/31/2012
Return After Taxes on Distributions and Sale of Fund Shares	2.74%	2.67%	2.14%	01/31/2012
I Class1 Return Before Taxes	4.54%	4.15%	3.56%	04/10/2017
Y Class1 Return Before Taxes	4.74%	4.27%	3.67%	04/10/2017
A Class Return Before Taxes	-0.51%	2.81%	2.67%	01/31/2012
C Class2 Return Before Taxes	3.45%	2.99%	2.51%	01/31/2012
R Class Return Before Taxes	3.96%	3.52%	2.94%	01/31/2012
R5 Class Return Before Taxes	4.65%	4.24%	3.66%	01/31/2012
R6 Class Return Before Taxes	4.70%	4.30%	3.91%	07/26/2013
G Class Return Before Taxes	5.27%	—	4.82%	07/28/2017
Bloomberg Barclays Global Aggregate Bond Index (USD, hedged) (reflects no deduction for fees, expenses or taxes)	5.58%	4.48%	3.97%	01/31/2012

1 Historical performance for the I and Y Classes prior to their inception is based on the performance of R5 Class shares. I and Y Class performance have been adjusted to reflect differences in expenses between classes, if applicable. Since inception performance for the I and Y Classes is based on the R5 Class inception date.

2 C Class shares automatically convert to A Class shares after approximately eight years. All returns for periods greater than eight years reflect this conversion.

Portfolio Management

Investment Advisor

American Century Investment Management, Inc.

Portfolio Managers

John A. Lovito, Senior Vice President and Senior Portfolio Manager, has served on teams managing fixed-income investments for American Century Investments since joining the advisor in 2009.

Simon Chester, Vice President and Portfolio Manager, has served on teams managing fixed-income investments for American Century Investments since joining the advisor in 2010.

Robert V. Gahagan, Senior Vice President and Senior Portfolio Manager, has served on teams managing fixed-income investments for American Century Investments since joining the advisor in 1983.

Abdelak Adjriou, Vice President and Senior Portfolio Manager, has served on teams managing fixed-income investments for American Century Investments since joining the advisor in 2016.

Purchase and Sale of Fund Shares

Unless otherwise specified below, the minimum initial investment amount to open an account is $2,500 ($1,000 for Coverdell Education Savings Accounts and IRAs). However, American Century Investments will waive the fund minimum if you make an initial investment of at least $500 and continue to make automatic investments of at least $100 a month until reaching the fund minimum. Investors opening accounts through financial intermediaries may open an account with $250 for the Investor, A, C and R Classes, but the financial intermediaries may require their clients to meet different investment minimums. The minimum may be waived for broker-dealer sponsored wrap program accounts, fee based accounts, and accounts through bank/trust and wealth management advisory organizations.

There is no minimum initial investment amount for Y, R5 or R6 Class shares.

There is a $50 minimum for subsequent purchases, except that there is no subsequent purchase minimum for financial intermediaries or employer-sponsored retirement plans.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Objectives, Strategies and Risks

What is the fund’s investment objective?

The fund seeks long-term total return.

What are the fund’s principal investment strategies?

Under normal market conditions, the fund invests at least 80% of its net assets in bonds. For purposes of this fund, the advisor defines bonds as non-money market debt securities which may be payable in U.S. or foreign currencies, and which may include U.S. and foreign corporate bonds and notes, government securities, commercial paper and securities backed by mortgages or other assets. The fund may change this 80% policy only upon 60 days’ prior written notice to shareholders. The fund generally hedges most of its foreign currency exposure to the U.S. dollar. The fund will normally limit its foreign currency exposure (from non-U.S. dollar-denominated securities or currencies) to 30% of its total assets.

The fund’s assets will be invested primarily in debt securities of issuers located in developed countries world-wide (including the United States). Under normal market conditions, the fund will invest at least 40% of its assets in foreign investments (unless the portfolio managers deem market conditions unfavorable, in which case the fund would invest at least 30% of its assets in foreign investments). The fund will allocate its assets among at least three different countries (one of which may be the United States).

The fund may invest in emerging markets securities. The fund considers a security to be an emerging markets security if its issuer is located outside the following developed countries list, which is subject to change: Australia, Austria, Belgium, Bermuda, Canada, Denmark, Finland, France, Germany, Ireland, Italy, Japan, Luxembourg, the Netherlands, New Zealand, Norway, Portugal, Spain, Sweden, Switzerland, the United Kingdom and the United States. In determining an issuer’s location, the portfolio managers may consider various factors including where the company is headquartered, where the company’s principal operations are located, where the company’s revenues are derived, where the principal trading market is located and the country in which the company was legally organized. The weight given to each of these factors will vary depending on the circumstances in a given case.

The weighted average maturity of the fund is expected to be between two and 12 years.


			Weighted average maturity (WAM) is a method for comparing portfolios of bonds by calculating the average time until full maturity weighted by the market value of the principal amount to be paid. A fund that contains a large proportion of bonds with significant periods of time remaining on their maturity terms will have a longer WAM, while the WAM will be shorter for a fund that contains more bonds close to maturity.

The fund may invest in securities issued or guaranteed by the U.S. Treasury and certain U.S. government agencies or instrumentalities such as the Government National Mortgage Association (Ginnie Mae). Ginnie Mae is supported by the full faith and credit of the U.S. government. The fund may also invest in securities issued or guaranteed by other U.S. government agencies or instrumentalities, such as the Federal National Mortgage Association (Fannie Mae), the Federal Home Loan Mortgage Corporation (Freddie Mac), and the Federal Home Loan Bank (FHLB), which are not guaranteed by the U.S. Treasury or supported by the full faith and credit of the U.S. government. However, they are authorized to borrow from the U.S. Treasury to meet their obligations.

In addition to the debt securities described above, the fund may also invest in bank loans.

The fund also invests in derivative instruments. The fund may invest in foreign currency exchange contracts to shift its investment exposure from one currency into another, for hedging purposes or to enhance returns. The fund may invest in futures contracts, options and swap agreements to manage duration, credit exposure and country exposure. In certain foreign markets, swaps can also act as substitutes for other less liquid fixed-income instruments. The fund may invest in collateralized debt obligations, including collateralized loan obligations, mortgage- or asset-backed securities and other similarly structured investments.

The fund may engage in active and frequent trading of portfolio securities to achieve its principal investment strategies. A higher portfolio turnover rate may indicate higher transaction costs and may affect fund performance. Higher portfolio turnover also may result in the realization and distribution of capital gains, including short-term capital gains.

The portfolio managers decide which debt securities to buy and sell by, among other things,

•identifying debt securities that satisfy the fund’s credit quality standards

•determining whether to alter the fund’s geographic or currency exposure

•determining which debt securities help the fund meet its maturity requirements

•assessing current and anticipated interest rates

•evaluating current economic conditions and the risk of inflation

•evaluating special features of the debt securities that may make them more or less attractive to alternatives

A description of the policies and procedures with respect to the disclosure of the fund’s portfolio securities is available in the statement of additional information.

What are the principal risks of investing in the fund?

When interest rates change, the fund’s share value will be affected. Generally, when interest rates rise, the fund’s share value will decline. The opposite is true when interest rates decline. The degree to which interest rate changes affect the fund’s performance varies and is related to the weighted average maturity of the fund. For example, when interest rates rise, you can expect the share value of a long-term bond fund to fall more than that of a short-term bond fund. When rates fall, the opposite is true. The fund’s investments are designed to reduce this risk. Interest rate risk, however, is generally higher for the fund than for funds that have shorter-weighted average maturities, such as money market and short-term bond funds. The fund will also be exposed to interest rate risk outside of the U.S. where interest rate trends may differ from those in the U.S. A period of rising interest rates may negatively affect the fund’s performance.

Most of the securities purchased by the fund are quality debt securities at the time of purchase. The fund, however, may invest part of its assets in securities rated in the lowest investment-grade category (e.g., BBB), and up to 35% of its assets in high-yield debt securities, which are rated in the fifth category (e.g., BB) or below. As a result, the fund may have increased credit risk. Although their securities are considered investment-grade, issuers of BBB-rated securities (and securities of similar quality) are more likely to have problems making interest and principal payments than issuers of higher-rated securities. Issuers of securities rated BB or below (and securities of similar quality) are even more vulnerable to real or perceived economic changes (such as an economic downturn or a prolonged period of rising interest rates), political changes or adverse developments specific to the issuer. In addition, lower-rated securities may be unsecured or subordinated to other obligations of the issuer. These factors may be more likely to cause an issuer of low-quality debt securities to default on its obligation to pay the interest and principal due under its securities.

The fund may also be subject to liquidity risk. The chance that a fund will have difficulty selling its debt securities is called liquidity risk. During periods of market turbulence or unusually low trading activity, in order to meet redemptions it may be necessary for the fund to sell securities at prices that could have an adverse effect on the fund’s price. The market for lower-quality debt securities is generally even less liquid than the market for higher-quality securities. Adverse publicity and investor perceptions, as well as new and proposed laws, also may have a greater negative impact on the market for lower-quality securities. Changing regulatory and market conditions, including increases in interest rates and credit spreads, may adversely affect the liquidity of the fund’s investments. Changing regulatory and market conditions, including increases in interest rates and credit spreads, may adversely affect the liquidity of the fund’s investments. In addition, when the market for certain investments is illiquid, the fund may be unable to achieve its desired level of exposure to a certain sector. Illiquid securities may be difficult to value.

The fund may invest in debt securities backed by mortgages or assets such as auto loan, home equity loan or student loan receivables. These underlying obligations may be prepaid, as when a homeowner refinances a mortgage to take advantage of declining interest rates. If so, the fund must reinvest prepayments at current rates, which may be less than the rate of the prepaid mortgage. Because of this prepayment risk, the fund may benefit less from declining interest rates than funds of similar maturity that invest less heavily in mortgage- and asset-backed securities.

Investing in securities of companies located in emerging market countries generally is also riskier than investing in securities of companies located in foreign developed countries. Emerging market countries may have unstable governments and/or economies that are subject to sudden change. These changes may be magnified by the countries’ emergent financial markets, resulting in significant volatility to investments in these countries. These countries also may lack the legal, business and social framework to support securities markets.

Options are subject to the risk that the underlying security or asset does not rise sufficiently above the exercise price to cover the premium and transaction costs.

If the fund enters into financial contracts, the fund will be subject to the credit risk presented by the counterparties.

Management

Who manages the fund?

The Board of Trustees, investment advisor and fund management team play key roles in the management of the fund.

The Board of Trustees

The Investment Advisor


Management Fees Paid by the Fund to the Advisor as a Percentage of Average Net Assets for the Fiscal Year Ended October 31, 2020	Investor Class	I Class	Y Class	A Class	C Class	R Class	R5 Class	R6 Class	G Class
Global Bond	0.82%	0.72%	0.62%	0.82%	0.82%	0.82%	0.62%	0.57%	0.00%

The Fund Management Team

The individuals listed below are jointly and primarily responsible for the day-to-day management of the fund described in this prospectus.

John A. Lovito

Simon Chester

Mr. Chester, Vice President and Portfolio Manager, has served on teams managing fixed-income investments since joining the advisor in 2010. He has a bachelor’s degree in commerce from the University of South Africa.

Robert V. Gahagan (Global Fixed Income Investment Committee Representative)

Mr. Gahagan, Senior Vice President and Senior Portfolio Manager, has served on teams managing fixed-income investments since joining the advisor in 1983. He has a bachelor’s degree in economics and an MBA from the University of Missouri – Kansas City.

Abdelak Adjriou

Mr. Adjriou, Vice President and Senior Portfolio Manager, has served on teams managing fixed-income investments since joining the advisor in 2016. Prior to joining American Century Investments, he was an emerging market fixed income, global bond and European fund manager for HSBC Global Asset Management. He has an engineering degree and a master’s degree in computer science from the Ecole Superieure en Sciences Informatiques (ESSI) (France) and a master’s in random modeling calculus from the Universite Paris VI - Jussieu.

Fundamental Investment Policies

Shareholders must approve any change to the fundamental investment policies contained in the statement of additional information, as well as any change to the investment objective of the fund. The Board of Trustees and/or the advisor may change any other policies or investment strategies described in this prospectus or otherwise used in the operation of the fund at any time, subject to applicable notice provisions.

Investing Directly with American Century Investments

Services Automatically Available to You

Account Maintenance Fee


			Personal accounts include individual accounts, joint accounts, UGMA/UTMA accounts, personal trusts, Coverdell Education Savings Accounts, IRAs (including traditional, Roth, Rollover, SEP-, SARSEP- and SIMPLE-IRAs), and certain other retirement accounts. If you have only business, business retirement, employer-sponsored or American Century Investments brokerage accounts, you are currently not subject to this fee, but you may be subject to other fees.

Wire Purchases

•American Century Investments bank information: Commerce Bank N.A., Routing No. 101000019, Account No. 2804918

•Your American Century Investments account number and fund name

•Your name

•The contribution year (for IRAs only)

•Dollar amount

New Investors: To make a wire purchase into a new account, please complete an application or call us prior to wiring money.

Ways to Manage Your Account

ONLINE

americancentury.com

Exchange shares: Exchange shares from another American Century Investments account with an identical registration.

Make additional investments: Make an additional investment into an established American Century Investments account. If we do not have your bank information, you can add it.

Sell shares*: Redeem shares and choose whether the proceeds are electronically transferred to your authorized bank account or sent by check to your address of record.

* Online redemptions up to $25,000 per day per account.

IN PERSON

If you prefer to handle your transactions in person, visit one of our Investor Centers and a representative can help you open an account, make additional investments, and sell or exchange shares.

•4500 Main Street, Kansas City, MO — 8 a.m. to 5 p.m., Monday – Friday

•4917 Town Center Drive, Leawood, KS — 8 a.m. to 5 p.m., Monday – Friday

BY TELEPHONE

Investor Services Representative: 1-800-345-2021

Business, Not-For-Profit and Employer-Sponsored Retirement Plans: 1-800-345-3533

Automated Information Line: 1-800-345-8765

Open an account: If you are a current investor, you can open an account by exchanging shares from another American Century Investments account with an identical registration.

Exchange shares: Call or use our Automated Information Line (available only to Investor Class shareholders).

Sell shares: Call or use our Automated Information Line. The Automated Information Line redemptions are up to $25,000 per day per account and are available for Investor Class shareholders only.

BY MAIL OR FAX

Mail Address: P.O. Box 419200, Kansas City, MO 64141-6200 — Fax: 1-888-327-1998

Open an account: Send a signed, completed application and check or money order payable to American Century Investments.

Exchange shares: Send written instructions to exchange your shares from one American Century Investments account to another with an identical registration.

Sell shares: Send written instructions or a redemption form to sell shares. Call a Service Representative to request a form.

Automatically

Open an account: Not available.

Exchange shares: Send written instructions to set up an automatic exchange of your shares from one American Century Investments account to another with an identical registration.

Make additional investments: With the automatic investment service, you can purchase shares on a regular basis. You must invest at least $50 per month per account.

Sell shares: You may sell shares automatically by establishing a systematic redemption plan.

See Additional Policies Affecting Your Investment for more information about investing with us.

Investing Through a Financial Intermediary

The fund may be purchased by participants in employer-sponsored retirement plans or through financial intermediaries that provide various administrative and distribution services.


			Financial intermediaries include banks, broker-dealers, insurance companies, plan sponsors and financial professionals.

Investor Class

I Class

I Class shares are available for purchase without sales charges or commissions by endowments, foundations, large institutional investors and other financial intermediaries.

Y Class

A Class

C Class

R Class

R5 Class

R6 Class

Calculation of Sales Charges

The information regarding sales charges provided herein is included free of charge and in a clear and prominent format at americancentury.com in the Investors Using Advisors and Investment Professionals portions of the website. From the descriptions of the Share Classes, hyperlinks will take you directly to this disclosure.

A Class


Purchase Amount	Sales Charge as a % of Offering Price	Sales Charge as a % of Net Amount Invested	Dealer Commission as a % of Offering Price
Less than $100,000	4.50%	4.71%	4.00%
$100,000 - $249,999	3.50%	3.63%	3.00%
$250,000 - $499,999	2.50%	2.56%	2.00%
$500,000 - $999,999	2.00%	2.04%	1.75%
$1,000,000 - $3,999,999	0.00%	0.00%	0.75%
$4,000,000 - $9,999,999	0.00%	0.00%	0.50%
$10,000,000 or more	0.00%	0.00%	0.25%

Reductions and Waivers of Sales Charges for A Class

•Certain trust accounts

•Solely controlled business accounts

•Single-participant retirement plans

•Endowments or foundations established and controlled by you or an immediate family member

Concurrent Purchases. You may combine simultaneous purchases in any share class of any American Century Investments fund to qualify for a reduced A Class sales charge.

Waivers for Certain Investors. The sales charge on A Class shares may be waived for:

•Current officers, directors and employees of American Century Investments

C Class

Calculation of Contingent Deferred Sales Charge (CDSC)

CDSC Waivers

Any applicable CDSC for A or C Classes may be waived in the following cases:

•redemptions through systematic withdrawal plans not exceeding annually 12% of the lesser of the original purchase cost or current market value

•redemptions through employer-sponsored retirement plans. For this purpose, employer-sponsored retirement plans do not include SEP IRAs, SIMPLE IRAs or SARSEPs.

•distributions from IRAs due to attainment of age 59½ for A and C Class shares

•required minimum distributions from retirement accounts due to the shareholder reaching the qualified age based on applicable IRS regulations

•tax-free returns of excess contributions to IRAs

•redemptions due to death or post-purchase disability

•exchanges, unless the shares acquired by exchange are redeemed within the original CDSC period

•IRA Rollovers from any American Century Investments fund held in an employer-sponsored retirement plan, for A Class shares only

•if no dealer commission was paid to the financial intermediary on the purchase for any other reason

Reinstatement Privilege

Employer-Sponsored Retirement Plans

Exchanging Shares

You may exchange shares of the fund for shares of the same class of another American Century Investments fund without a sales charge if you meet the following criteria:

•The exchange is for a minimum of $100

•For an exchange that opens a new account, the amount of the exchange must meet or exceed the minimum account size requirement for the fund receiving the exchange

Moving Between Share Classes and Accounts

Buying and Selling Shares Through a Financial Intermediary

Your ability to purchase, exchange, redeem and transfer shares will be affected by the policies of the financial intermediary through which you do business. Some policy differences may include

•minimum investment requirements

•exchange policies

•fund choices

•cutoff time for investments

•trading restrictions

See Additional Policies Affecting Your Investment for more information about investing with us.

Additional Policies Affecting Your Investment

Eligibility for Investor Class Shares

•self-directed accounts on transaction-based platforms that may or may not charge a transaction fee

•employer-sponsored retirement plans

•broker-dealer sponsored fee-based wrap programs or other fee-based advisory accounts

•insurance products and bank/trust products where fees are being charged

Minimum Initial Investment Amounts for Investor, A, C and R Classes

Unless otherwise specified below, the minimum initial investment amount to open an account is $2,500. However, American Century Investments will waive the fund minimum if you make an initial investment of at least $500and continue to make automatic investments of at least $100 a month until reaching the fund minimum. Investors opening accounts through financial intermediaries may open an account with $250, but the financial intermediaries may require their clients to meet different investment minimums. See Investing Through a Financial Intermediary for more information.


Broker-dealer sponsored wrap program accounts and/or fee-based advisory accounts			No minimum
Coverdell Education Savings Account (CESA) and IRAs			$1,0001, 2
Employer-sponsored retirement plans			No minimum

2 The minimum initial investment for shareholders investing through financial intermediaries is $250. Financial intermediaries may have different minimums for their clients.

Subsequent Purchases

Eligibility for I Class Shares

Minimum Initial Investment Amounts for I Class

American Century Investments may permit an intermediary to waive the initial minimum per shareholder as provided in Buying and Selling Fund Shares in the statement of additional information.

Eligibility for Y Class Shares

Minimum Initial Investment Amounts for Y Class

There is no minimum initial investment amount or subsequent investment amount for Y Class shares, but financial intermediaries may require different investment minimums.

Eligibility for R5 and R6 Class Shares

The fund’s R5 and R6 Class shares are generally available only through employer-sponsored retirement plans where a financial intermediary provides retirement recordkeeping services to plan participants. To be eligible, plan level or omnibus accounts must be held on the books of the fund. R6 Class shares also are available to funds of funds advised by American Century and unaffiliated funds of funds sold primarily to the employer-sponsored retirement plan market.

Minimum Initial Investment Amounts for R5 and R6 Classes