Mark Cuban Alleges Business Exclusion by Mavericks Leadership

WHO:

NY Post - Mark Cuban, billionaire businessman and former majority owner of the Dallas Mavericks.

RealGM Basketball - Patrick Dumont, Dallas Mavericks governor and son-in-law of Miriam Adelson.

RealGM Basketball - Nico Harrison, former general manager of the Dallas Mavericks.

RealGM Basketball - Luka Doncic, player involved in a trade.

WHAT:

USA Today - Mark Cuban has filed a dispute in Dallas County, Texas, court, seeking to compel the Mavericks' executives to disclose details of the franchise's new arena plans.

USA Today - Cuban stated he wants information on "the financing of a new Dallas Mavericks arena at Valley View and the exploration and identification of locations for the new arena, among other things."

USA Today - The proposed new arena at Valley View would include a practice facility and entertainment plans around it.

Pro Football Network - Mark Cuban is taking Patrick Dumont to court over the $3.5 billion sale of the Mavericks, alleging that they had a handshake deal that Dumont broke.

RealGM Basketball - Cuban claims he had an agreement to continue overseeing basketball operations after the sale, but Dumont granted full control to former general manager Nico Harrison.

NY Post - Mark Cuban alleges he was frozen out of business opportunities related to a proposed arena move by Mavericks leadership.

RealGM Basketball - Cuban claims Dumont engaged in "adversarial business practices" while pursuing a plan to relocate the franchise.

RealGM Basketball - Cuban sold his majority stake in the Mavericks in 2023 but retains 27 percent ownership.

RealGM Basketball - The purchase agreement allows the Adelson and Dumont families to acquire an additional 20 percent of Cuban's stake.

RealGM Basketball - Cuban claims he was unaware of Harrison's plan to trade Luka Doncic to the Los Angeles Lakers until it was too late to intervene.

RealGM Basketball - The trade of Luka Doncic drew significant backlash across the league.

WHERE:

RealGM Basketball - The proposed new arena site is located roughly 10 miles north of downtown Dallas, at a former mall site.

RealGM Basketball - The Mavericks have played downtown Dallas since entering the NBA as an expansion franchise in 1980.

WHEN:

RealGM Basketball - Cuban sold his majority stake in the Mavericks in 2023.

RealGM Basketball - The trade of Luka Doncic occurred in February 2025.

RealGM Basketball - Harrison was fired in November following a slow start to the 2025-26 season.

RealGM Basketball - The Mavericks signed an option agreement to purchase approximately 104 acres in north Dallas as part of a plan for a new arena opening in 2031.

RealGM Basketball - The current lease at American Airlines Center expires in 2031.

WHY:

USA Today - Cuban claims he was “contractually entitled to participate” in the Valley View deal.

RealGM Basketball - Cuban states that his businesses were contractually entitled to participate in the new site, which he describes as a unique investment opportunity.

RealGM Basketball - Cuban states his businesses were contractually entitled to participate in the new site, which he describes as a unique investment opportunity.

HOW:

USA Today - Cuban alleges that Dumont engaged in “adversarial business practices” while pursuing the arena relocation plan.

RealGM Basketball - Cuban alleges that Dumont's actions constituted a freeze-out from business opportunities related to the arena move.

Mark Cuban has filed a dispute in Dallas County, Texas, court, aiming to compel Mavericks' executives to reveal details about the franchise's plans for a new arena at Valley View. He claims he is "contractually entitled to participate" in the deal and is seeking information on the financing and location exploration for the new venue, which would also feature a practice facility and entertainment options. Cuban alleges that Dumont engaged in "adversarial business practices" during the pursuit of the arena relocation plan.