Jul 9, 2026 7:02 PM

Mark Cuban alleges "adversarial business practices" and broken promises in a high-stakes legal petition, claiming the Dallas Mavericks’ new leadership is freezing him out of future investments.

DALLAS - The Dallas Mavericks are trying to move on from a recent past that included the unfortunate Luka Doncic trade. But the negative ramifications of that time continue on, with the latest involving a power struggle over issues of ownership.

As first reported exclusively by MavsRoundtable.com, Mark Cuban claims that Mavs governor Patrick Dumont has essentially been freezing him out as the franchise plans a move away from downtown Dallas to a new site.

According to MavsRoundtable's report, Cuban is alleging that there are "adversarial business practices" involved in the move of the team. And Cuban has now submitted a court filing - a "Rule 202 petition'' - to establish that the contracts he signed in his 2023 sale to Dumont and the Adelson family entitle him to be a part of the new arena (set to open north of downtown at the Vista View site in 2031) and other opportunities.

We've been asked by readers to provide documentation of Cuban's business filing against the Mavs organization, and we do so below.

Cuban details the background that led to the sale ...

Cuban claims Dumont "did not live up to his end of the bargain and mentions the Doncic trade to the Lakers as something that "disappointingly confirmed'' the allegedly botched arrangement.

Cuban thinks his right to participate in the investment opportunity is contractually guaranteed and cites Dumont's allegedly "adversarial business practices.''

Cuban seeks a deposition for clarity.

Cuban states his case and notes that he "declares under the penalty of perjury that the foregoing is true and correct.

Of interest to Mavs fans curious about the origins of the sale and the relationships involved: 

The original partnership, the filing states, came in part because, as Cuban himself writes, "I supported the (Adelson family's) Las Vegas Sands' effort because I believed that having a Venetian-style destination resort would turn Dallas into the largest tourist destination in the United States and be worth potentially $10 billion.

"This joint effort created both an established business relationship and a trusted personal relationship ...''

As the 16-page document (the bulk of which is revealed here) demonstrates, those "relationships'' are obviously now gone ... quite possibly left to be addressed further in a court of law.

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