Who is the owner of HFT?

I'm curious, who exactly is the owner of HFT, or High-Frequency Trading? Is it a single individual, a consortium of investors, or perhaps a publicly traded company? How transparent is the ownership structure, and what kind of regulations does HFT operate under to ensure fairness and stability in the financial markets? Additionally, has there been any controversy surrounding the ownership of HFT, and if so, what are the implications for the industry as a whole? Understanding the ownership structure of HFT is crucial in assessing its impact on the market and ensuring that it operates within ethical and legal boundaries.