Who owns Quicken loans?

Can you tell me, who exactly owns Quicken Loans? I've heard that it's a major player in the mortgage industry, but I'm not sure about its ownership structure. Is it a publicly traded company, or is it privately owned? Are there any major shareholders or investors that have a significant stake in the company? I'm interested in learning more about the background and financial standing of Quicken Loans, so I can better understand its position in the market and make informed decisions about working with them.