# EDGAR Filing Document

**Accession Number:** 0000872825
**File Stem:** 0000872825-26-000022
**Filing Date:** 2026-3
**Character Count:** 17768
**Document Hash:** 413f347324c1dfd09e8d8771f7704577
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000872825-26-000022.hdr.sgml**: 20260331

**ACCESSION NUMBER**: 0000872825-26-000022

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260331

**DATE AS OF CHANGE**: 20260331

**EFFECTIVENESS DATE**: 20260331

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** AMERICAN CENTURY WORLD MUTUAL FUNDS INC
- **CENTRAL INDEX KEY:** 0000872825

**ORGANIZATION NAME:**
- **EIN:** 431567889
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 1130

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-39242
- **FILM NUMBER:** 26817338

**BUSINESS ADDRESS:**
- **STREET 1:** 4500 MAIN STREET
- **CITY:** KANSAS CITY
- **STATE:** MO
- **ZIP:** 64111
- **BUSINESS PHONE:** 816-531-5575

**MAIL ADDRESS:**
- **STREET 1:** 4500 MAIN STREET
- **CITY:** KANSAS CITY
- **STATE:** MO
- **ZIP:** 64111

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** TWENTIETH CENTURY WORLD INVESTORS INC
- **DATE OF NAME CHANGE:** 19920703

## Series and Classes Contracts Data

### INTERNATIONAL SMALL-MID CAP FUND (Series ID: S000048405)

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000152811 | INVESTOR CLASS | ANTSX           |
| C000152812 | G CLASS        | ANTMX           |

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| | | |
|:---|:---|:---|
| **Summary Prospectus&nbsp;&nbsp;&nbsp;&nbsp;**April 1, 2026<br>**American Century Investments**<sup>®</sup><br>**International Small-Mid Cap Fund** | **Summary Prospectus&nbsp;&nbsp;&nbsp;&nbsp;**April 1, 2026<br>**American Century Investments**<sup>®</sup><br>**International Small-Mid Cap Fund** | ![screenshot2025-11x17163328a.jpg](screenshot2025-11x17163328a.jpg) |
| **Investor Class:** ANTSX | **G Class:** ANTMX |  |

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| | |
|:---|:---|
| Before you invest, you may want to review the fund's prospectus, which contains more information about the fund and its risks. You can find the fund's prospectus, reports to shareholders, and other information about the fund online at the web addresses listed below. You can also get this information at no cost by calling or sending an email request. The fund's prospectus and other information are also available from financial intermediaries (such as banks and broker-dealers) through which shares of the fund may be purchased or sold. | Before you invest, you may want to review the fund's prospectus, which contains more information about the fund and its risks. You can find the fund's prospectus, reports to shareholders, and other information about the fund online at the web addresses listed below. You can also get this information at no cost by calling or sending an email request. The fund's prospectus and other information are also available from financial intermediaries (such as banks and broker-dealers) through which shares of the fund may be purchased or sold. |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Retail Investors**<br>americancentury.com/docs<br>1-800-345-2021 or 816-531-5575<br>prospectus@americancentury.com | **Financial Professionals**<br>americancentury.com/fadocs<br>1-800-345-6488<br>advisor_prospectus@americancentury.com |
| This summary prospectus incorporates by reference the fund's <u>[prospectus and statement of additional information](https://www.sec.gov/ix?doc=/Archives/edgar/data/872825/000087282526000006/ck0000872825-20260330.htm)</u> (SAI), each dated April 1, 2026 (as supplemented at the time you receive this summary prospectus), as well as the Report of Independent Registered Public Accounting Firm and the financial statements included in the fund's <u>[Form N-CSR](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000872825/000087282526000002/ck0000872825-20251130.htm)</u> for the fiscal year ended November 30, 2025. The fund's SAI and Form N-CSR may be obtained, free of charge, in the same manner as the prospectus. | This summary prospectus incorporates by reference the fund's <u>[prospectus and statement of additional information](https://www.sec.gov/ix?doc=/Archives/edgar/data/872825/000087282526000006/ck0000872825-20260330.htm)</u> (SAI), each dated April 1, 2026 (as supplemented at the time you receive this summary prospectus), as well as the Report of Independent Registered Public Accounting Firm and the financial statements included in the fund's <u>[Form N-CSR](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000872825/000087282526000002/ck0000872825-20251130.htm)</u> for the fiscal year ended November 30, 2025. The fund's SAI and Form N-CSR may be obtained, free of charge, in the same manner as the prospectus. |

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**Investment Objective** 

The fund seeks capital growth.

**Fees and Expenses**

The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund.

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| | | |
|:---|:---|:---|
| **Annual Fund Operating Expenses** (expenses that you pay each year as a percentage of the value of your investment) | **Annual Fund Operating Expenses** (expenses that you pay each year as a percentage of the value of your investment) | **Annual Fund Operating Expenses** (expenses that you pay each year as a percentage of the value of your investment) |
|  | *Investor* | *G* |
| Management Fee | 1.43% | 1.08% |
| Distribution and Service (12b-1) Fees |  |  |
| Other Expenses | 0.02% | 0.02% |
| Total Annual Fund Operating Expenses | 1.45% | 1.10% |
| Fee Waiver<sup>1</sup> | 0.03% | 1.08%² |
| Total Annual Fund Operating Expenses After Fee Waiver | 1.42% | 0.02% |

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<sup>1</sup>&nbsp;&nbsp;&nbsp;&nbsp;*The advisor has agreed to waive 0.03 percentage points of the fund's Investor Class management fee. The advisor expects this waiver to continue until March 31, 2027 and cannot terminate it prior to such date without the approval of the Board of Directors.*

<sup>2</sup>&nbsp;&nbsp;&nbsp;&nbsp;*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 Directors.* 

**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:

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| | | | | |
|:---|:---|:---|:---|:---|
|  | *1 year* | *3 years* | *5 years* | *10 years* |
| Investor Class | $145 | $456 | $790 | $1732 |
| G Class | $2 | $6 | $11 | $26 |

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**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 128% of the average value of its portfolio.

**Principal Investment Strategies**

The fund's assets will be invested primarily in equity securities of companies that are small- to medium-sized at the time of purchase and are located in foreign developed countries. Under normal market conditions, the fund will invest at least 80% of its net assets in companies that are small- to medium-sized. The portfolio managers consider small to medium companies to be those that have a market capitalization not greater than that of the largest company in the MSCI EAFE SMID Cap Index. Though market capitalization will change from time to time, as of January 31, 2026, the total market capitalization of the largest company in the MSCI EAFE SMID Cap Index was approximately $39.1 billion.

The portfolio managers look for stocks of companies they believe will increase in value over time, using an investment strategy developed by the fund's investment advisor. In implementing this strategy, the portfolio managers make their investment decisions based primarily on their analysis of individual companies, rather than on broad economic forecasts. Management of the fund is based on the belief that, over the long term, stock price movements follow growth in earnings, revenues and/or cash flow. The portfolio managers use a variety of analytical research tools and techniques to help them make decisions about buying or holding stocks of companies that meet their investment criteria and selling the stocks of companies that do not.

Under normal market conditions, the fund's portfolio managers seek securities of companies whose earnings, revenues or key business fundamentals are not only growing, but growing at an accelerating pace.

The fund may engage in active and frequent trading of portfolio securities 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**

**• Foreign Risk** – Foreign securities are generally riskier than U.S. securities. 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 gains or losses. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

**• Small-Cap Stock Risk** – Smaller companies may have limited financial resources, product lines, markets and have less publicly available information. These securities may trade less frequently and in more limited volumes than larger companies' securities, leading to higher transaction costs. Smaller companies also may be more sensitive to changing economic conditions, and investments in smaller foreign companies may experience more price volatility.

**• Currency Risk** – The fund could experience gains or losses based solely on changes in the exchange rate between foreign currencies and the U.S. dollar.

**• Growth Stocks Risk** – Investments in growth stocks may be more volatile than other stocks and the overall stock market. These stocks are typically priced higher than other stocks because of their growth potential, which may or may not be realized.

**• Style Risk** – If at any time the market is not favoring the fund's growth investment style, the fund's gains may not be as big as, or its losses may be bigger than, those of other equity funds using different investment styles.

• **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.

• **Sector Risk** – If the fund is overweighted in a stock or sector, any negative development related to that stock or sector will have a greater impact on the fund than other funds that are not overweighted in that stock or sector.

• **High Portfolio Turnover Risk** – The fund may engage in active and frequent trading of its portfolio securities. High portfolio turnover may result in increased transaction costs to the fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities.

• **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 and/or have adverse tax consequences. Redemption activity can occur for many reasons, including shareholder reactions to market events or product changes. To the extent that a large shareholder (including the advisor, another account advised by the advisor, a fund of funds) invests in the fund, the fund may experience relatively large redemptions as such shareholder reallocates its assets.

**• Market Risk** – The value of the fund's shares will go up and down based on the performance of the companies whose securities it owns and other factors generally affecting the securities market. Market risks, including political, regulatory, economic and social developments, can affect the value of the fund's investments. Natural disasters, public health emergencies, war, terrorism and other

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unforeseeable events may lead to increased market volatility and may have adverse long-term effects on world economies and markets generally.

**• Price Volatility Risk** – The value of the fund's shares may fluctuate significantly in the short term.

**• 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 table also shows returns for the MSCI EAFE Small Cap Index, which the advisor considers to be more representative of the fund's investment strategy. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future.

**Calendar Year Total Returns**

![chart-35d1b0c4b88d4190896.jpg](chart-35d1b0c4b88d4190896.jpg)

**Highest Performance Quarter (2Q 2020): 33.95% &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Lowest Performance Quarter (1Q 2020): -25.14%**

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| | | | |
|:---|:---|:---|:---|
| **Average Annual Total Returns** <br>*For the calendar year ended December 31, 2025* | *1 year* | *5 years* | *10 years* |
| **Investor Class** Return Before Taxes | 27.38% | 1.97% | 6.30% |
| &nbsp;&nbsp;&nbsp;Return After Taxes on Distributions | 26.79% | 0.66% | 5.04% |
| &nbsp;&nbsp;&nbsp;Return After Taxes on Distributions and Sale of Fund Shares | 16.54% | 1.29% | 4.79% |
| **G Class** Return Before Taxes | 29.04% | 3.41% | 7.62% |
| MSCI EAFE Index<br>&nbsp;&nbsp;&nbsp;&nbsp;(reflects no deduction for fees, expenses or taxes,<br>&nbsp;&nbsp;&nbsp;&nbsp;other than foreign withholding tax) | 31.22% | 8.92% | 8.18% |
| MSCI EAFE Small Cap Index<br> (reflects no deduction for fees, expenses or taxes,<br> other than foreign withholding tax) | 31.83% | 5.62% | 7.49% |

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The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary. The 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.

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**Portfolio Management**

**Investment Advisor**

American Century Investment Management, Inc.

**Portfolio Managers**

**Trevor Gurwich,** Vice President and Senior Portfolio Manager, has been a member of the team that manages the fund since the fund's inception in 2015.

**Federico Laffan,** Vice President and Portfolio Manager, has been a member of the team that manages the fund since the fund's inception in 2015.

**Pratik Patel,** Vice President and Portfolio Manager, has been a member of the team that manages the fund since the fund's inception in 2015.

**Purchase and Sale of Fund Shares**

The fund is available for purchase only by funds and collective investment trusts advised by American Century Investments. The fund does not have a minimum purchase amount.

G Class shares are available for purchase by other funds offered by American Century Investments for which it charges a management fee. In its sole discretion, American Century Investments may also make G Class shares available for purchase by other institutional clients for which American Century Investments provides investment management services for a fee pursuant to an investment advisory agreement. Currently, eligible clients are limited to commingled investment trusts or other pooled investment vehicles that utilize a target date or other asset allocation investment strategy for which American Century Investments provides asset allocation or glide path investment management services for a fee. 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).

<sup>©</sup>2026 American Century Proprietary Holdings, Inc. All rights reserved.

CL-SUM-97559 2604

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