Cuban Accuses Mavs' Dumont of 'Adversarial' Practices
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- Mark Cuban alleges that Mavericks governor Patrick Dumont has engaged in "adversarial business practices" and frozen him out of investment opportunities connected to a proposed move of the team roughly 10 miles north of downtown Dallas.
- Cuban sold his majority stake in 2023 to the families of Miriam Adelson and Dumont — who is Adelson's son-in-law — but retains 27% ownership, and the purchase agreement reportedly contains a clause allowing those families to buy another 20% of his stake.
- Cuban said he had an agreement to continue running basketball operations, but Dumont gave former general manager Nico Harrison full control of the basketball side of the franchise.
- Cuban stated in the filing that he was unaware of Harrison's plan to trade superstar Luka Doncic to the Los Angeles Lakers in February 2025 until it was too late to object; Harrison was fired in November 2025 after the team's slow start to the 2025-26 season.
- The Mavericks signed an option agreement roughly a month before Cuban's filing to purchase approximately 104 acres in north Dallas for a new arena targeted to open in 2031, when the team's American Airlines Center lease expires after 51 seasons downtown.
Why it matters: Cuban still owns 27% of the Mavericks and claims his businesses were "contractually entitled to participate" in the north Dallas arena project, but the Adelson-Dumont families hold a contractual path to increase their stake by another 20%. The filing puts the team's planned 2031 arena move — anchored by roughly 104 acres of north Dallas real estate — directly into a governance fight that already cost one GM his job over the Doncic trade.
