Mark Cuban accuses Dallas Mavericks owners of shutting him out of new arena proposal, court filing reveals

Mark Cuban accused Dallas Mavericks owners of shutting him out of major business decisions, according to a new court filing. Cuban, a former majority owner, alleges that Patrick Dumont is engaging in “adversarial business practices” as part of an effort to relocate the team roughly 10 miles north of downtown Dallas to the former Valley View Mall site. The filing arrives after the Mavericks signed an option agreement to purchase approximately 104 acres for an arena project planned to open in 2031. Cuban said his businesses were “contractually entitled to participate” and the document characterizes the Valley View relocation as a “unique investment opportunity.” It asks a Dallas County district judge to order ADI LLC, the entity tied to the option contract, to share information with Cuban. The dispute also unfolds as Cuban becomes more public about regret after selling the team to Dumont and Miriam Adelson. The filing recounts that Cuban says he learned about the Luka Doncic trade during a phone call with Nico Harrison, who was fired in November following a slow 2025–26 start.