The Sierra Tactical Municipal Fund Institutional Shares (STMEX) is a mutual fund that focuses on investing in municipal bonds. These bonds are issued by state and local governments to fund public projects such as schools, roads, and hospitals. The fund aims to provide investors with tax-free income while also managing risk through a tactical approach to investing. This means that the fund's managers actively adjust the fund's holdings based on market conditions and economic trends. As an institutional share class, this fund is typically only available to large investors such as institutions and high net worth individuals.