The fund invests, under normal circumstances, at least 80% of its net assets (plus any borrowings for investment purposes) in securities of U.S. issuers, and in derivatives and other instruments that have economic characteristics similar to such securities. It normally invests at least 65% of its net assets in equity securities of mid-capitalization companies. The fund may invest up to 20% of its net assets in real estate investment trusts (REITs).