The Rational/Pier 88 Convertible Securities Fund Class C (PBXCX) is a mutual fund that primarily invests in convertible securities, which are bonds or preferred stocks that can be converted into common stocks. This fund aims to provide investors with a balance of income and capital appreciation by investing in a diverse portfolio of convertible securities. The "Class C" designation indicates that this fund has a lower expense ratio compared to other classes of the same fund, making it a more cost-effective option for investors. Overall, PBXCX offers a rational and well-managed approach to investing in convertible securities.