The investment seeks to achieve long-term growth of capital. The fund invests at least 80% of its net assets, plus borrowings for investment purposes, in securities of mid-capitalization companies. It generally allocates approximately 50% of its net assets to a portion of the fund that invests in the common stocks of companies included in the S&P 400 Index in a manner that is intended to track the performance of that index, commonly referred to as an indexing strategy. The other portion of the fund invests in futures and options contracts, including contracts to the S&P 400 Index, and other strategies to manage the fund's equity exposure.