Pioneer High Income Municipal Fund Class A (PIMAX) is a mutual fund that primarily invests in municipal bonds with the goal of generating high levels of tax-exempt income for its investors. The fund focuses on investing in high-quality, investment-grade municipal bonds issued by state and local governments in the United States. PIMAX may also invest in other fixed-income securities, such as corporate bonds and mortgage-backed securities, to diversify its portfolio. With a focus on generating income, this fund may be suitable for investors seeking tax-efficient ways to grow their wealth.