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Summary Prospectus March 1, 2018 (as revised December 1, 2018) American Century Investments^® Sustainable Equity Fund

Investor Class: AFDIX I Class: AFEIX	Y Class: AFYDX A Class: AFDAX	C Class: AFDCX R Class: AFDRX	R5 Class: AFDGX




	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 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/funds/fund_reports.jsp 1-800-345-2021 or 816-531-5575 prospectus@americancentury.com	Financial Professionals americancentury.com/ipro/funds/fund_reports_mf.jsp 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, 2018 (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, 2017. 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. Income is a secondary objective.

Fees and Expenses

The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. 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 13 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	I¹	Y	A	C	R	R5
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None	None	None	5.75%	None	None	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	None	None	None²	1.00%	None	None
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	$25	None	None	None	None	None	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
Management Fee³	0.84%	0.64%	0.49%	0.84%	0.84%	0.84%	0.64%
Distribution and Service (12b-1) Fees	None	None	None	0.25%	1.00%	0.50%	None
Other Expenses	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%
Total Annual Fund Operating Expenses	0.85%	0.65%	0.50%	1.10%	1.85%	1.35%	0.65%
Fee Waiver⁴	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%
Total Annual Fund Operating Expenses After Fee Waiver	0.80%	0.60%	0.45%	1.05%	1.80%	1.30%	0.60%


¹	Prior to April 10, 2017, this class was referred to as the Institutional Class.


²	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.

³ The management fee has been restated to reflect the decrease in the management fee schedule effective August 1, 2018.

⁴The advisor has agreed to waive 0.05 percentage points of the fund’s management fee. The advisor expects this fee waiver to continue until November 30, 2019 and cannot terminate it prior to such date 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, that you earn a 5% return each year, and that the fund’s operating expenses remain the same. You may be required to pay brokerage commissions on your purchases of Investor, I or Y Class shares of the fund, which are not reflected in the example. 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	$82	$267	$467	$1,045
I Class	$61	$203	$358	$806
Y Class	$46	$156	$275	$624
A Class	$676	$900	$1,142	$1,834
C Class	$183	$578	$997	$2,163
R Class	$133	$423	$735	$1,619
R5 Class	$61	$203	$358	$806

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 18% of the average value of its portfolio.

Principal Investment Strategies

The fund will generally invest in larger-sized companies using a quantitative model that combines fundamental measures of a stock’s value and growth potential. To measure value, the managers may use ratios of stock price-to-earnings and stock price-to-cash flow, among others. To measure growth, the managers may use the rate of growth of a company’s earnings and cash flow and changes in its earnings estimates, as well as other factors. The model also considers price momentum. The portfolio managers also take environmental, social and governance ("ESG") factors into account in making investment decisions. The portfolio managers attempt to build a portfolio of stocks that provides better returns than, and a dividend yield comparable to, the S&P 500® Index, without taking on significant additional risk.

Under normal market conditions, the fund will invest at least 80% of its net assets in equity securities.

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.

When determining whether to sell a security, the portfolio managers consider among other things, a security’s price, whether a security’s risk parameters outweigh its return opportunities, general market conditions, whether the security meets their ESG criteria, and any other factor deemed relevant by the portfolio managers.

Principal Risks


•	Style Risk - If at any time the market is not favoring the fund’s investment process, 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.


•	Benchmark Correlation - The fund’s performance will be similar to the performance of its benchmark, the S&P 500^® Index. If the fund’s benchmark goes down, it is likely that the fund’s performance will go down.


•	ESG Criteria Risk - Because the fund's ESG criteria may exclude the securities of certain issuers for nonfinancial reasons, the fund may forego some market opportunities available to funds that do not use ESG criteria.


•	Foreign Securities - 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.


•	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.


•	Principal Loss - 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 A 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. Because the Y Class does not have investment performance for a full calendar year, it is not included. 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

Highest Performance Quarter (3Q 2009): 15.47% Lowest Performance Quarter (4Q 2008): -20.53%



Average Annual Total Returns For the calendar year ended December 31, 2017	1 year	5 years	10 years
A Class Return Before Taxes	18.31%	13.49%	7.20%
Return After Taxes on Distributions	17.58%	13.15%	6.96%
Return After Taxes on Distributions and Sale of Fund Shares	10.97%	10.79%	5.81%
C Class Return Before Taxes	24.58%	13.97%	7.02%
R Class Return Before Taxes	25.20%	14.55%	7.56%
R5 Class¹ Return Before Taxes	26.07%	15.36%	8.32%
Investor Class Return Before Taxes	25.79%	15.12%	8.10%
I Class Return Before Taxes	26.05%	15.35%	8.32%
S&P 500^® Index (reflects no deduction for fees, expenses or taxes)	21.83%	15.78%	8.49%


¹	Historical performance for the R5 Class prior to its inception (April 10, 2017) 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 A 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

Gregory J. Woodhams, CFA, Co-CIO, Global Growth Equity, Senior Vice President and Senior Portfolio Manager, has been a member of the team that manages the fund since 2008.

Justin M. Brown, CFA, Vice President and Portfolio Manager, has been a member of the team that manages the fund since 2008.

Joseph Reiland, CFA, Vice President and Portfolio Manager, has been a member of the team that manages the fund since 2008.

Robert J. Bove, 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 ($2,000 for Coverdell Education Savings Accounts). 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 or R5 Class shares.

For the Investor, A, C, R and R5 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. For purposes of fund minimums, employer-sponsored retirement plans do not include SEP IRAs, SIMPLE IRAs or SARSEPs. 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.

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 Class. 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.

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