Joiners: No Joiners Today. Leavers: Sumo Group has left AIM following a takeover. What’s cooking in the IPO kitchen? Unbound Group PLC, (currently called Electra Private Equity PLC) to join AIM. Unbound Group, will be the parent company for a range of brands focused on the 55 plus demographic. Initially focused on Hotter Shoes, Unbound's curated, multi-brand retail platform will offer additional products and services that will enhance the enjoyment and wellbeing of its targeted customer communit ....