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Form 497K AMERICAN CENTURY MUTUAL

July 30, 2021 11:50 AM EDT

Summary Prospectus      March 1, 2021 (as revised August 1, 2021)
American Century Investments®
Ultra® Fund
newaci_logoblkf39.jpg 
    
Investor Class: TWCUX
I Class: TWUIX
Y Class: AULYX
A Class: TWUAX
C Class: TWCCX
R Class: AULRX
R5 Class: AULGX
R6 Class: AULDX
G Class: AULNX
 
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.

 
   
 
Retail Investors
americancentury.com/docs
1-800-345-2021 or 816-531-5575
prospectus@americancentury.com
Financial Professionals
americancentury.com/fadocs
1-800-345-6488
advisor_prospectus@americancentury.com
 
    
 
This summary prospectus incorporates by reference the fund’s prospectus and statement of additional information (SAI), each dated March 1, 2021 (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 annual report to shareholders, dated October 31, 2020. The fund’s SAI and annual report may be obtained, free of charge, in the same manner as the prospectus.
 
Investment Objective
The fund seeks long-term 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. 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 $50,000 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 14 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)
 InvestorIYACRR5R6G
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)NoneNoneNone5.75%NoneNoneNoneNoneNone
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)NoneNoneNoneNone¹1.00%NoneNoneNoneNone
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)$25NoneNoneNoneNoneNoneNoneNoneNone



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
 InvestorIYACRR5R6G
Management Fee0.96%0.76%0.61%0.96%0.96%0.96%0.76%0.61%0.61%
Distribution and Service (12b-1) FeesNoneNoneNone0.25%1.00%0.50%NoneNoneNone
Other Expenses0.01%0.01%0.01%0.01%0.01%0.01%0.01%0.01%0.01%
Total Annual Fund Operating Expenses0.97%0.77%0.62%1.22%1.97%1.47%0.77%0.62%0.62%
Fee Waiver0.02%²0.02%²0.02%²0.02%²0.02%²0.02%²0.02%²0.02%²0.61%³
Total Annual Fund Operating Expenses
After Fee Waiver
0.95%0.75%0.60%1.20%1.95%1.45%0.75%0.60%0.01%
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 the purchase.
2  The advisor has agreed to waive a portion of the fund's management fee such that the management fee does not exceed 0.938% for Investor, A, C and R Classes, 0.738% for I and R5 Classes, and 0.588% for Y and R6 Classes. The advisor expects this waiver arrangement to continue until July 31, 2022 and cannot terminate it prior to such date without the approval of the Board of Directors.
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 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:
 1 year3 years5 years10 years
Investor Class$97$308$535$1,188
I Class$77$244$426$953
Y Class$61$197$344$773
A Class$690$939$1,206$1,965
C Class$198$617$1,061$2,098
R Class$148$464$802$1,754
R5 Class$77$244$426$953
R6 Class$61$197$344$773
G Class$1$3$6$13
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 6% of the average value of its portfolio.
Principal Investment Strategies
The portfolio managers look for stocks of companies they believe will increase in value over time. 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 identify the stocks of larger-sized companies that meet their investment criteria. Under normal market conditions, the portfolio managers seek securities of companies whose earnings or revenues are not only growing, but growing at an accelerated pace. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. Among other variables, the portfolio managers will consider the fund’s growth and momentum profile relative to the benchmark. Other analytical techniques help identify additional signs of business improvement, such as increasing cash flows, or other indications of the relative strength of a company’s business. In addition to accelerating growth and other signs of business improvement, the fund also considers companies demonstrating price strength relative to their peers. This means that the portfolio managers favor companies whose securities are the strongest performers compared to the overall market. These techniques help the portfolio managers buy or hold the stocks of



companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.
Although the portfolio managers intend to invest the fund’s assets primarily in U.S. securities, the fund may invest in securities of foreign companies when these securities meet the portfolio managers’ standards of selection.
The fund may write covered calls on a portion of the fund’s holdings in common stock when the portfolio managers believe call premiums are attractive relative to the price of the underlying security.
Principal Risks 
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.
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, 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.
Price Volatility Risk — The value of the fund’s shares may fluctuate significantly in the short term.
Foreign Securities Risk — The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.
Covered Call Risk — Writing covered calls may limit the fund’s ability to participate in price increases of the underlying securities and could lower the fund’s return.
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, 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
chart-fbe2531a87bc4b5fa12.jpg
Highest Performance Quarter (2Q 2020): 32.22% Lowest Performance Quarter (4Q 2018): -16.62%
Average Annual Total Returns
For the calendar year ended December 31, 2020
1 year5 years10 yearsSince Inception
Inception
Date
Investor Class Return Before Taxes
49.78%22.78%17.81%11/02/1981
Return After Taxes on Distributions48.78%21.34%16.64%11/02/1981
Return After Taxes on Distributions and Sale of Fund Shares30.14%18.23%14.76%11/02/1981
I Class Return Before Taxes
50.07%23.03%18.05%11/14/1996
Y Class1 Return Before Taxes
50.29%23.21%19.98%04/10/2017
A Class Return Before Taxes
40.80%21.04%16.82%10/02/1996
C Class2 Return Before Taxes
48.25%21.56%16.82%10/29/2001
R Class Return Before Taxes
49.02%22.17%17.22%08/29/2003
R5 Class3 Return Before Taxes
50.08%23.03%18.05%04/10/2017
R6 Class Return Before Taxes
50.29%23.21%19.98%07/26/2013
G Class Return Before Taxes
51.21%43.95%04/01/2019
Russell 1000® Growth Index
   (reflects no deduction for fees, expenses or taxes)
38.49%20.97%17.19%
S&P 500® Index
   (reflects no deduction for fees, expenses or taxes)
18.40%15.20%13.87%—        
1    Historical performance for the Y Class prior to its inception is based on the performance of R6 Class shares, which have the same expenses as the Y Class shares. Since inception performance for the Y Class is based on the R6 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.
3    Historical performance for the R5 Class prior to its inception is based on the performance of I Class shares, which have the same expenses as the R5 Class shares.
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
Keith Lee, CFA, Senior Vice President and Senior Portfolio Manager, has been a member of the team that manages the fund since 2008.
Michael Li, Vice President and Senior Portfolio Manager, has been a member of the team that manages the fund since 2008.
Jeffrey R. Bourke, CFA, Vice President and Portfolio Manager, has been a member of the team that manages the fund since 2008.      
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.
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 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 invest in the I or Y Class.
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.















































©2021 American Century Proprietary Holdings, Inc. All rights reserved.
CL-SUM-91793   2108



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