Who owns GMX?

Could you please elaborate on the ownership structure of GMX? I'm curious to understand who the primary stakeholders are and if there are any notable investors or institutions with a significant influence over the company. Is GMX a privately held entity or is it publicly traded? Additionally, what is the company's governance structure and how does it ensure the interests of its shareholders are protected? Understanding the ownership and governance of GMX is crucial for investors and stakeholders to make informed decisions.