Plasmid-mediated colistin resistance of the mobile colistin resistance (MCR) type is a growing concern in since it has been described worldwide in humans and animals. Here, we identified a series of MCR-producing isolates corresponding to two different clones (represented by isolates PS1 and PS8b) producing MCR-1 and MCR-5, respectively, obtained from pig fecal samples in France. Plasmid analysis showed that the plasmid carrying the gene (pPS1) possesses an IncHI2 backbone, whereas the gene was carried onto a 6,268-bp nontypeable non-self-conjugative plasmid (pPS8b). Detailed analysis of plasmid pPS8b revealed a 3,803-bp-long cassette containing the gene that was bracketed by two inverted-repeat (IR) sequences with 5-bp-long direct repeats at each extremity, similarly to an insertion sequence, but with the exception that no transposase gene was identified within this cassette. By performing transposition experiments, we showed that the cassette could be mobilized by the Tn transposase provided in , displaying a mobilization mechanism similar to that of miniature inverted-repeat transposable elements (MITEs).