The owners of the Las Vegas-based UFC are in "advanced talks" to sell the business.

ESPN is reporting there are several bids for the mixed martial arts business, some as high as $4 billion. Some of the reported bidders include WME/IMG, China Media Capital, The Blackstone Group and Dalian Wanda Group.

Zuffa LLC bough the UFC back in 2001 for $2 million.

The Fertitta family, owners of Station Casinos, are heavily involved in UFC. We have reached out to Red Rock Resorts for comment.

However, David Scholler, the vice president of public relations and athlete marketing for the UFC, told ESPN, "As a private company, we don't discuss speculation or rumors related to our business."