Under normal market conditions, the Fund pursues its objective by investing at least 80% of its net assets in equity securities of issuers which Thornburg views as having substantial economic ties to one or more developing countries. The material factors that Thornburg considers when determining whether an issuer has substantial economic ties to a developing country include whether the issuer:

•is included in the MSCI Emerging Markets Index;

•is organized or headquartered in a developing country, or maintains most of its assets in one or more such countries;

•has a primary listing for its securities on a stock exchange of a developing country; or

•derives a majority of its profits, revenues, sales, or income from one or more developing countries.

Currently, Thornburg considers developing countries to include most Central and South American, African, Asian (including the Middle and Near East, and the Indian subcontinent) and Central and Eastern European nations.

The Fund may invest in issuers of any size of capitalization, including small companies, and expects that under normal conditions its assets will be invested in issuers domiciled in or tied economically to a variety of different developing countries.

The Fund’s policy of investing at least 80% of its net assets in developing country issuers may be changed by the Fund’s Trustees without a shareholder vote upon 60 days’ notice to shareholders. As used herein, the term “net assets” includes the amount of any borrowings made by the Fund for investment purposes.

Among the specific factors considered in identifying securities for inclusion in the Fund are domestic and international economic developments, outlooks for securities markets, the supply and demand for equity securities, and analysis of specific issuers. Thornburg typically categorizes the Fund’s equity investments in one of the following three categories:

Basic Value: Companies generally operating in mature or cyclical industries and which generally exhibit more economic sensitivity and/or higher volatility in earnings and cash flow.

Consistent Earner: Companies which generally exhibit predictable growth, profitability, cash flow and/or dividends.

Emerging Franchise: Companies with the potential to grow at an above average rate because of a product or service that is establishing a new market and/or taking share from existing participants.

Inclusion of any investment in any of the three described categories represents Thornburg’s opinion concerning the characteristics and prospects of the investment. There is no assurance that any company selected for investment will, once categorized in one of the three described investment categories, continue to have the positive characteristics or fulfill the expectations that Thornburg had for the company when it was selected for investment, and any such company may not grow or may decline in earnings and size.

The Fund may sell an investment if Thornburg has identified a better investment opportunity, in response to changes in the conditions or business of the investment’s issuer or changes in overall market conditions, if Thornburg has a target price for the investment and that target price has been achieved, or if, in Thornburg’s opinion, the investment no longer serves to achieve the Fund’s investment goals.