JMUB focuses on investment-grade, intermediate-maturity municipal bonds. The funds active manager takes a long-term approach that it expects to perform well over a full market cycle. It is worth noting the fund is allowed to hold up to 10% of assets in securities rated below investment grade. In the case where there are not enough municipal securities available to meet the funds needs, the fund may invest in repurchase agreements or US Treasury securities, which may be subject to federal taxes. JMUBs weighted average maturity will generally be within 3 and 12 years.