Wheeling-based MMA Warehouse LLC, an online retailer of mixed martial arts gear, clothing and accessories, has sold a majority stake to PAG Capital, a Chicago-based private equity firm.

MMA Chief Executive Mika Casey will continue to lead the company, which was started in 2004, and retain “significant” ownership. Terms weren’t disclosed.

PAG was founded in 2008. Besides retailing, MMA Warehouse has also sponsored more than 100 professional fighters and has appeared in two recent video games.

“In PAG Capital, we have found a partner that will best position us to capitalize on the strong worldwide growth of the mixed martial arts industry,” Casey said in a statement.

Mixed martial arts combines elements of martial arts, wrestling and boxing.

“PAG Capital’s strategic and financial support will enable us to continue to invest in our platform, expand our marketing capabilities, and capitalize on the many organic growth and acquisition opportunities available to us in the industry,” Casey said.

byerak@tribune.com