Normally investing at least 80% of assets in equity securities. Equity securities represent an ownership interest, or the right to acquire an ownership interest, in an issuer. Equity securities include common stocks (including depositary receipts evidencing ownership of common stock), preferred stocks and other preferred securities, convertible securities, rights and warrants, and other securities, such as hybrid securities and trust preferred securities, believed to have equity-like characteristics. Derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives. Investing in equity securities of companies with market capitalizations generally similar to companies in the S&P 500® Index or Russell 1000 Index. Generally using computer-aided, quantitative analysis of historical valuation, growth, profitability, and other factors to select a broadly diversified group of stocks that may have the potential to provide a higher total return than that of the S&P 500® Index. Employing a disciplined rules-based "Defensive Option Collar" strategy designed in combination with a diversified portfolio of equity securities to provide the fund with a significant portion of the returns associated with equity market investments while exposing investors to less risk than traditional long-only equity strategies. The "Defensive Options Collar" strategy involves purchasing index put options to provide downside protection in certain market conditions (i.e., offset or mitigate a decrease in the value of the fund's investments) and selling index call options that provides income to substantially offset the cost of that downside protection. Managing the options positions in a way that provides diversification of options strike prices and expirations. Investing in domestic and foreign issuers. Lending securities to earn income for the fund.