Strategy. Principal Investment Strategies Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in sustainable equity securities. Equity securities may include common stock, preferred stock, securities convertible into common or preferred stock, rights, and warrants. The Funds subadviser, American Century Investment Management, Inc. (American Century), currently considers sustainable securities to be those to which the subadvisers proprietary model assigns an ESG score that is in the top three quartiles of the environmental, social, and governance (ESG) scores the model assigns to all of the securities in the Funds benchmark, the S&P 500 Index. The Fund generally invests in large-capitalization companies American Century believes show improving business fundamentals and … Show more… Principal Investment Strategies Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in sustainable equity securities. Equity securities may include common stock, preferred stock, securities convertible into common or preferred stock, rights, and warrants. The Funds subadviser, American Century Investment Management, Inc. (American Century), currently considers sustainable securities to be those to which the subadvisers proprietary model assigns an ESG score that is in the top three quartiles of the environmental, social, and governance (ESG) scores the model assigns to all of the securities in the Funds benchmark, the S&P 500 Index. The Fund generally invests in large-capitalization companies American Century believes show improving business fundamentals and attractive ESG characteristics compared to their peer companies, using a proprietary multi-factor model that combines fundamental measures of a stocks value and growth potential with ESG metrics. The model assigns each security a financial metrics score and an ESG score that are combined to create an overall score. American Century currently defines large capitalization companies as companies with capitalizations in the capitalization range of the S&P 500 Index. The Fund may at times have significant exposure to one or more industries or sectors. The Fund may hold a portion of its assets in cash or cash equivalents. To measure value, American Century may use ratios of stock price-to-earnings and stock price-to-cash flow. To measure growth, American Century may use the rate of growth of a companys earnings and cash flow and changes in its earnings estimates. The model also considers price momentum. American Century arrives at an ESG score by evaluating multiple metrics of each ESG characteristic environmental, social, and governance. American Century utilizes internal data and research, as well as third party commercial data sources and scoring systems, to evaluate each securitys ESG characteristics. To the extent such information is available and relevant for a particular company, American Century will consider, among other things, a companys carbon emission profile, energy and water usage, or waste generation (environmental), a companys employee turnover rates, digital privacy, or worker safety (social), and a companys corporate leadership, including board chair independence and the independence of audit and compensation committees or shareholder rights such as say on pay (governance). If an ESG score is unavailable or incomplete, a security may still be selected for the portfolio if American Century believes it can evaluate the security qualitatively, or if the financial metrics and/or remaining ESG data merit investment. Qualitative review of portfolio securities may include examination of registration statements and other information provided by the company as well as engagement with company management. Final scores for each security are evaluated on a sector-specific basis, and the Fund seeks to hold securities with the strongest scores in their respective sectors. Using this process, American Century attempts to build a portfolio of stocks that has sustainable competitive advantages, provides better returns without taking on significant additional risk, and maintains a stronger ESG profile than the S&P 500 Index. Although American Century intends to invest the Funds assets primarily in U.S. securities, the Fund may invest in securities of foreign companies when these securities meet American Centurys standards of selection. When determining whether to sell a security, American Century considers among other things, a securitys price, whether a securitys risk parameters outweigh its return opportunities, general market conditions, and whether the security meets its ESG criteria. Show less