Data were collected through an in silico comparison of the outbreak-associated plasmid pESBL-PH-2018 against 93,823 complete plasmid sequences downloaded from the NCBI RefSeq plasmid database on 16 July 2024. Mash was used to identify closely related plasmids, retaining sequences with ≥0.98 similarity and a shared-hash fraction of ≥0.90; this produced a dataset of 61 related plasmids. Plasmid size, bacterial host, sequence type, isolation source, country and collection date were retrieved from the corresponding NCBI records. Sequence similarity and coverage were assessed using BLASTn, while core single-nucleotide polymorphisms were identified using Snippy and recalculated after removal of predicted recombinant regions with Gubbins. The resulting genomic similarity measurements, epidemiological metadata and host-associated genomic characteristics were compiled in Appendix File S2.