RYDEX SERIES FDS S P SMALL CAP 600 PURE MUTUAL FUNDS USMF - What does RYDEX SERIES FDS S P SMALL CAP 600 PURE MUTUAL FUNDS USMF mean? - What does RYDEX SERIES FDS S P SMALL CAP 600 PURE MUTUAL FUNDS USMF stand for? - RYDEX SERIES FDS S P SMALL CAP 600 PURE MUTUAL FUNDS USMF meaning