BBMUX 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 a steady stream of tax-free income while also preserving their capital. It is managed by Bridge Builder Funds, a reputable investment management company. With a ticker symbol of BBMUX, this fund offers investors the opportunity to diversify their portfolio and potentially earn a stable return through the reliable income generated by municipal bonds.