Former two-division UFC champion Conor McGregor made the payday of his career last year. That being said, it would appear that the UFC megastar's McGregor Sports and Entertainment Ltd suffered heavy losses in 2017. Conor McGregor made his professional boxing debut back in 2017. Having suffered a tenth round TKO defeat to Floyd Mayweather Jr., "Notorious" earned an estimated career high payday of $100 million. As reported by The Sun, McGregor Sports and Entertainment Ltd faced losses of £317,055 ( or roughly over $400,000) in 2017. Conor McGregor is the exclusive share holder of the company, though the fighter's longtime girlfriend Dee Devlin is a director within the business. For more MMA news click here.