RYDEX SERIES FDS S P 500 PURE GROWTH MUTUAL FUNDS USMF - What does RYDEX SERIES FDS S P 500 PURE GROWTH MUTUAL FUNDS USMF mean? - What does RYDEX SERIES FDS S P 500 PURE GROWTH MUTUAL FUNDS USMF stand for? - RYDEX SERIES FDS S P 500 PURE GROWTH MUTUAL FUNDS USMF meaning