Former Dallas Mavericks majority owner Mark Cuban has accused team governor Patrick Dumont of excluding him from key business opportunities linked to the franchise's proposed move to a new arena in north Dallas.
According to court filings, Cuban claims Dumont engaged in "adversarial business practices" that prevented him from participating in a major redevelopment project, despite contractual agreements he believes entitle him to be involved.
Cuban sold his controlling stake in the Mavericks in 2023 to the families of Miriam Adelson and Patrick Dumont but retained a 27% ownership interest. He has previously said he expected to continue overseeing basketball operations following the sale, but that responsibility was instead handed to former general manager Nico Harrison.
Cuban also maintains he was not informed in time to challenge Harrison's controversial decision to trade Luka Dončić to the Los Angeles Lakers in 2025.
The latest dispute centres on the Mavericks' plans to relocate from the American Airlines Center, where the franchise has played since its inaugural 1980 season. The organization recently secured an option to purchase about 104 acres in north Dallas for a proposed arena and entertainment complex expected to open in 2031, when the team's current lease expires. Cuban argues the development represents a significant investment opportunity in which his companies were contractually entitled to participate.
Neither Cuban nor the Mavericks publicly commented on the allegations. The filing adds another chapter to the growing tensions between the billionaire entrepreneur and the franchise's current ownership group following a series of disagreements over the club's direction since the 2023 ownership change.
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