Edge-bridged trig. bipy. Mo3Ir3(μ4-η2-CO)(μ3-CO)(CO)10(η5-C5H5)3 (1) was obtained. Bicapped trig. bipy. Mo3RhIr3(μ-CO)4(CO)7(η5-C5H5)3(η5-C5Me5) (2) was obtained from 1. Differing electron counts of 2 and W3Ir4(μ-H)(CO)12(η5-C5H5)3 (3) were rationalized.