Israeli-American billionaire Miriam Adelson sells Dallas Mavericks stake to daughter and son-in-law, who now control the $3.5 billion team

Israeli-American billionaire Miriam Adelson has sold her stake in the Dallas Mavericks to her daughter and son-in-law, handing them control of the NBA franchise her family bought from Mark Cuban at a $3.5 billion valuation nearly three years ago.

Patrick Dumont and his wife, Sivan Ochshorn, now own 69% of the team after buying Adelson’s shares, the Mavericks said on Tuesday. The purchase was completed in October, according to the organization. Neither the team nor the family disclosed a price.

“We are very happy with our family ownership and could not be more excited about the future of the Dallas Mavericks,” the Dumont family said in a statement, adding that it remains committed to building a championship team and investing in the Dallas community.

The deal formalizes what was already clear inside the franchise. Dumont, chairman and chief executive of casino operator Las Vegas Sands, has served as the Mavericks’ governor and main decision-maker since the Adelson family took over. Ochshorn is Adelson’s daughter.

The ownership change comes nearly three years after Cuban sold his majority stake in December 2023. Adelson, whose family controls Las Vegas Sands, bought in alongside Dumont and Ochshorn at that time in a deal that valued the team at about $3.5 billion.

Cuban still owns 27% of the Mavericks, while Mary Stanton, the widow of an original shareholder, holds 4%, according to Baller Alert. Under the 2023 agreement, Dumont reportedly has the option to buy another 20% from Cuban at the same $3.5 billion valuation. That would lift the family’s stake to 89% and cut Cuban’s to 7%.

At the 2023 valuation, Cuban’s remaining 27% stake would be worth about $945 million, though NBA franchise values have climbed sharply since then.

Dumont’s tenure has not been without controversy. In February 2025, he approved the trade of star guard Luka Doncic to the Los Angeles Lakers, a move that angered fans and contributed to the later dismissal of general manager Nico Harrison.

Since then, the team has rebuilt its leadership. Masai Ujiri became team president and alternate governor in May, Mike Schmitz was named general manager, and Dusty May took over as head coach. Cooper Flagg, the No. 1 pick in the 2025 NBA Draft, was named 2026 Rookie of the Year and has helped the team to a 4-3 start this season.

The family also has big plans off the court. The Mavericks are pursuing a new arena and entertainment district at the former Valley View Mall site in North Dallas, targeting a 2031 opening, when the team’s lease at the American Airlines Center expires.

Meanwhile, Chief Executive Rick Welts will retire at the end of December, with team president Ethan Casson taking over as CEO on Jan. 1, 2027.