Spanning the Southern Ocean high latitudes, subantarctic islands are protected areas with high conservation values. Despite the remoteness of these islands, invasive species threaten their native species and ecosystem function. The most ubiquitous and speciose group of invasive species are invertebrates. Due to their cryptic habits and ambiguous establishment history, the impacts of invasive invertebrates on native species and ecosystems in the region remains largely unknown. Understanding how invasive invertebrate species are transported, disperse, establish and colonise new habitats is key to understanding their existing and future impacts. This knowledge is also fundamental to improving biosecurity practise and informing future management of Southern Ocean islands. We undertook invertebrate surveys on Macquarie Island to determine the current status of four non-native macro-invertebrates - Kontikia andersoni and Arthurdendyus vegrandis (Platyhelminthes: Geoplanidae), Styloniscus otakensis (Isopoda: Styloniscidae) and Puhuruhuru patersoni (Amphipoda: Talitridae). We found A. vergrandis, S. otakensis and P. patersoni had not markedly expanded their range. In contrast, K. andersoni has more than doubled its previously mapped area and expanded at a rate of ~500m−yr since 2004. We discuss the possible underlying mechanisms for the dramatic range expansion of K. andersoni and consider the implications for the future management of Macquarie Island.