Who owns the EPX group?

Could you please clarify who exactly owns the EPX group? Is it a publicly traded company, a private equity firm, or a group of individuals? Are there any major shareholders or stakeholders involved in the ownership structure? Additionally, have there been any changes in ownership over the years, and if so, what were the reasons behind those changes? It would be helpful to understand the overall ownership structure and any potential implications it may have on the group's operations and decision-making processes.