Bryn Mawr billionaire and Fanatics founder and CEO Michael Rubin is selling his ten percent stake in Harris Blitzer Sports & Entertainment, the owner of the Philadelphia 76ers and New Jersey Devils, writes John Ourand for the Philadelphia Business Journal.

He is expected to get up to $300 million from the sale, as the company was valued at $3 billion earlier this month.

Rubin, who is a lifelong Sixers fan, decided to sell his share in the team as Fanatics began to expand into businesses that could potentially create conflicts of interest for the owner of the NBA and NHL sports teams.

Fanatics has recently started to expand into trading cards and collectibles and sports betting/gaming. Fanatics’ trading card and collectibles business will be making direct deals with possibly thousands of athletes.

These deals would be against league rules if Rubin still owned parts of the two teams. He would have also run into conflicts with the leagues as part of his sports betting and gaming business, which is certain to take bets on the 76ers and Devils.

Read more about Michael Rubin in the Philadelphia Business Journal.