Mark Cuban, the former majority owner of the Dallas Mavericks, has escalated his ongoing dispute with the team's current ownership by filing a legal petition in Dallas County district court. The action seeks sworn testimony from a corporate representative of the Arena Development Institute, a Delaware company formed by the Mavericks' ownership group. Cuban's frustrations center on what he describes as being deliberately excluded from discussions about the team's plans to build a new arena, a project that could culminate in a move from the American Airlines Center by the 2031-32 season.
Background on the Arena Deal
In June, the Mavericks publicly announced they had entered into an option agreement for the potential purchase of 104 acres of land at the former Valley View Mall site in North Dallas. The move signals the franchise's intention to construct a new state-of-the-art arena and entertainment district, similar to the vision that Cuban says was originally discussed when he sold his majority stake in 2023. The team's current lease at the American Airlines Center expires in 2031, and the ownership group has made no secret of its desire to secure a more modern and financially favorable venue. However, Cuban claims that the Arena Development Institute's actions may violate pre-existing contracts he holds with the Mavericks' owners in Texas. His legal filing demands transparency about the terms of the land acquisition and the overall plans for the new arena.
The Handshake Agreement and Its Breakdown
According to the petition filed by Cuban's lawyers, the billionaire investor had a handshake agreement with Miriam Adelson and her son-in-law, Patrick Dumont, when he sold his majority stake in the Mavericks to Adelson. Cuban began working with the Adelson family as early as 2019 to push for legalized gambling in Texas, with the long-term goal of building a 'Venetian style destination resort' somewhere in the Dallas-Fort Worth Metroplex. The handshake deal, as Cuban describes it, was that he would retain control over basketball operations while Dumont would manage the business side of the franchise. This agreement, Cuban says, was reiterated in multiple emails and orally in the presence of Dumont, Adelson, another NBA owner, and Mavericks employees. When asked by reporters to produce these emails, Cuban declined, stating, 'Can't say anything at all.'
The relationship between Cuban and Dumont began to sour when Dumont increasingly leaned on former general manager Nico Harrison to make basketball decisions. Initially, this approach worked well. The Mavericks acquired P.J. Washington and Daniel Gafford ahead of the 2024 trade deadline, sparking a remarkable run that ended in the NBA Finals. But all goodwill evaporated in February 2025 when Harrison, with Dumont's backing, traded franchise cornerstone Luka Dončić to the Los Angeles Lakers. The move was widely criticized and eventually cost Harrison his job. In May, Dumont hired Masai Ujiri, a championship-winning executive from the Toronto Raptors, as president and alternate governor. Ujiri quickly asserted his authority by firing coach Jason Kidd, who still had more than $40 million remaining on his contract.
Legal and Financial Stakes
Cuban maintains a 27 percent stake in the Mavericks but has minimal say in the team's day-to-day operations. In the legal filing, Cuban claims that Dumont once told him, 'Why would I give you control of a $4 billion asset?' This statement underscores the fundamental shift in power dynamics since Cuban sold his majority share. The Adelson family, led by Miriam Adelson — the widow of casino magnate Sheldon Adelson — has deep pockets and a clear vision for leveraging the Mavericks to advance their gambling interests in Texas. Legal sports betting remains illegal in the state, but the family has lobbied aggressively to change that. The potential new arena, with its accompanying entertainment district, could become a centerpiece of that push. Cuban's legal action is not just about transparency; it's about protecting the financial arrangements he still has in place from his sale of the team.
Historical Context: Cuban's Legacy with the Mavericks
Mark Cuban purchased the Dallas Mavericks in 2000 for $285 million, transforming the franchise from a perennial loser into a championship contender. Under his ownership, the Mavericks won their first NBA title in 2011, defeating the Miami Heat in a six-game series. Cuban became known for his hands-on approach, sitting courtside, interacting with fans, and often clashing with referees and league officials. His persona as a passionate, tech-savvy billionaire made him one of the most recognizable owners in professional sports. When he sold his majority stake to Miriam Adelson in 2023, many assumed Cuban would continue to play a prominent role, given his deep ties to the team and the community. However, the transition of power has been anything but smooth. The trade of Luka Dončić, a player Cuban had publicly hailed as untouchable, was a turning point. Cuban's diminished influence became apparent as Dumont and Adelson made decisions without consulting him, including the hiring of Ujiri and the firing of Kidd.
Implications for the NBA and Texas
The legal battle between Cuban and the Mavericks' ownership has broader implications for the NBA. The league has strict rules about ownership transparency and conflicts of interest. Cuban's claim that he was kept in the dark about the arena deal could prompt an investigation by the commissioner's office. Additionally, the outcome of this case could affect the ongoing efforts to legalize sports gambling in Texas. The Adelson family's casino empire, Las Vegas Sands Corp., has invested millions in lobbying state legislators. A new venue in North Dallas, if built, would likely include a casino component if gambling is eventually legalized. Cuban, who has been a vocal advocate for legalized sports betting in Texas, may find himself at odds with his former partners if the arena deal proceeds without his input. The lawsuit also raises questions about the enforceability of handshake agreements in professional sports, where multi-billion-dollar deals often rely on verbal understandings alongside formal contracts.
What Happens Next
The petition filed by Cuban's lawyers seeks sworn testimony from a corporate representative of the Arena Development Institute. A hearing is expected to be scheduled in the coming weeks. If the court grants Cuban's request, the Mavericks' ownership will be compelled to disclose details about the arena negotiations, including the option agreement for the Valley View Mall site. Cuban may also seek to block any move that violates his existing contracts. Meanwhile, the Mavericks are preparing for the upcoming season under Masai Ujiri's leadership. The team has undergone significant roster changes following the Dončić trade and the hiring of a new coach. The situation remains fluid, and the relationship between Cuban and Dumont appears irreparable. For now, the focus is on the legal proceedings, which could reveal much about the inner workings of one of the NBA's most intriguing ownership transitions.
Source:The Athletic News