Thornburg Investment Income Builder I (Thornburg Investment Income Bui) Fonds

The fund pursues its investment goals by investing in a broad range of income producing securities, primarily including stocks and bonds. It will under normal conditions invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in income-producing securities, and at least 50% of its net assets, plus the amount of any borrowings for investment purposes, in common stocks.