Strategy. The Fund seeks to achieve its investment objective by applying bottom -up fundamental analysis and investing in a long -term , tax -aware manner. The Fund aims to implement the strategy by investing primarily in a diversified portfolio of investment grade municipal bonds rated in the four highest credit ratings categories (AAA to BBB, or equivalent) at the time of purchase by at least one nationally recognized credit rating agency, or, if unrated, deemed to be of comparable quality by the investment adviser. Under normal circumstances, the Fund will invest at least 80% of its net assets at the time of purchase, plus any borrowings for investment purposes, in municipal bonds that pay interest that is generally excludable from gross … Show more… The Fund seeks to achieve its investment objective by applying bottom -up fundamental analysis and investing in a long -term , tax -aware manner. The Fund aims to implement the strategy by investing primarily in a diversified portfolio of investment grade municipal bonds rated in the four highest credit ratings categories (AAA to BBB, or equivalent) at the time of purchase by at least one nationally recognized credit rating agency, or, if unrated, deemed to be of comparable quality by the investment adviser. Under normal circumstances, the Fund will invest at least 80% of its net assets at the time of purchase, plus any borrowings for investment purposes, in municipal bonds that pay interest that is generally excludable from gross income for federal income tax purposes. However, certain municipal securities may pay interest that is includable as taxable income for purposes of the federal alternative minimum tax. There can be no assurance that the Fund will achieve its investment objective. The Fund may invest in fixed-, variable- or floating -rate municipal securities issued by states, territories and possessions of the United States and the District of Columbia and their political subdivisions, agencies, and instrumentalities, authorities thereof, and multi -state agencies, issued to obtain funds for various public purposes. These may include general obligation bonds, which typically are backed by the issuers ability to levy taxes, and revenue bonds, which typically are backed by a stream of revenue from a particular facility or class of facilities or, in some cases, from the proceeds of a special excise or other specific revenue source. Municipal securities also include auction rate municipal securities. The Fund may invest up to 15% of the market value of its total assets in securities that may be purchased on a when -issued or delayed delivery basis. The Fund may also invest up to 20% of its total assets in securities that are not municipal securities, if, in the opinion of the Investment Adviser, these securities will enhance after -tax returns for Fund investors. Non -municipal securities investments may include notes and bonds issued by domestic and non -U .S. corporations and financial institutions and the U.S. Government, its agencies and guaranteed issuers. In addition, the Fund may purchase asset -backed securities, mortgage backed securities, auction rate securities and other sovereign debt when the Investment Adviser believes that the additional returns from these securities justify the risk of allocations to these asset classes. Under normal circumstances, the Fund expects the portfolios dollar weighted average maturity to be between 3 and 10 years. The Fund may invest in money market instruments, repurchase agreements and derivative instruments, consisting of futures, swaps and options, to hedge its investments or to seek to enhance returns. The Fund will not invest 25% or more of total assets in municipal obligations relating to similar types of projects or with other similar economic, business, or political characteristics (such as bonds of airport facilities or healthcare providers). For purposes of this policy, securities of the U.S. Government, its agencies, or instrumentalities and municipal obligations backed by the credit of governmental entities are not subject to this 25% limit. The Fund may invest more than 25% of its total assets in municipal securities whose issuers are located in any one state. As part of the Funds investment process, the Investment Adviser considers environmental, social and governance (ESG) when evaluating investments in municipal bonds and structured products. The Investment Adviser does not evaluate ESG factors for securities issued by the U.S. government and its agencies. ESG factors may include, but are not limited to, the environmental and social risks of the issuer, as well as the issuers instituted governance programs. Show less