Mark Cuban has secured $450 million in investor commitments for his private equity fund focused on professional sports, reaching the first close of his flagship vehicle according to people familiar with the matter.

The capital raise marks a notable milestone for the billionaire entrepreneur best known as owner of the Dallas Mavericks. First closes typically signal a fund has reached sufficient scale to begin pursuing investments while continuing to raise additional capital from limited partners.

Sports-focused private equity funds have attracted growing investor interest as professional sports leagues generate expanding media rights revenue and franchise values appreciate. Cuban's venture targets an asset class that offers investors exposure to these trends alongside the celebrity appeal of sports ownership.

The $450 million commitment total positions the fund among mid-sized private equity vehicles in the sports investment space, though well below the largest sovereign wealth and institutional investor-backed sports funds.