Mo-substituted triple perovskite superconducting samples with the stoichiometric composition La 1 . 5 Nd 0 . 5 Ca 1 Ba 2 (Cu 1 - x Mo x ) 5 O z , [LNCBCuMO] with x=0.0, 0.01, 0.03, 0.05 and 0.10, have been investigated using X-ray diffraction, electrical resistivity, magnetic susceptibility, magnetization and oxygen content measurements. The observed reduction in T c with increasing Mo content (x) in LNCBCuMO, can be attributed to the decrease in hole concentration. Magnetization measurements as a function of temperature and field (H), exhibit an M-H hysteresis loop, which indicates moderate flux pinning, which can be attributed to the pinning centers created by Mo substitution at Cu sites. The critical current density, J c , deduced from the M-H data satisfies the flux creep model.