[Mn-3](2) and [Mn-3](4) supramolecular aggregates of weakly exchange-coupled Mn-3(III) single-molecule magnets (SMMs) with S = 6 have been prepared by carboxylate substitution on [Mn3O(O2CMe)(3)(mpko)(3)](+) [mpkoH = methyl(pyridine-2-yl) ketone oxime)] with the dicarboxylic acids alpha-truxillic acid and fumaric acid, respectively. The method opens up a new approach to Mn-3 SMM aggregates of various size and topology.