The title compound, [Mo₃Pd(PPh₃)S₄(Tm)₃]PF₆·0.5CH₃OH·3H₂O (Tm = hydrotris(methimazolyl)borate), crystallized in the triclinic space group P1 with the following unit-cell parameters: a = 14.8578(3)Å, b = 14.9415(3)Å, c = 20.308(2)Å, α = 109.806(8)°, β = 96.546(7)°, γ = 101.774(7)°, V = 4069.5(5)ų and Z = 2. The crystal structure was solved by direct methods, and refined by full-matrix least-squares procedures to a final R-value of 0.0574 for 14608 observed reflections. The octahedral coordination geometry of two molybdenum atoms are defined by three sulfur donors from a tridentate Tm ligand and three μ₃S atoms. The distorted trigonalbipyramidal geometry of the remaining molybdenum atom is defined by two sulfur donors from a bidentate Tm ligand and three μ₃S atoms.