Patrick and Sivan Dumont buy out Miriam Adelson's stake in Dallas Mavericks

Patrick Dumont and his wife, Sivan Ochshorn, have bought Miriam Adelson's shares of the Dallas Mavericks, a spokesman said on Tuesday. ESPN first reported the sale, which closed last month. It makes the Dumont family the controlling owners with a 69% share of the franchise.

Adelson bought the Mavericks in December 2023 alongside her daughter, Ochshorn, and son-in-law Dumont, purchasing the team from Mark Cuban. She has had little day-to-day involvement since. Dumont has held final say on major decisions and has represented the team at NBA Board of Governors meetings.

Cuban still holds 27% of the team, and Mary Stanton, widow of an original shareholder, owns 4%. Cuban has said he regrets selling the Mavericks to Adelson and Dumont. Under the terms of the sale, Dumont can buy another 20% from Cuban at the original $3.5 billion valuation.

The Dumont family said in a prepared statement that it is "deeply committed to building a championship team, supporting our fans and growing the organization's impact in the local community through our investments in the city of Dallas." The family added that it "could not be more excited about the future of the Mavericks."

Dumont, 52, is CEO of Las Vegas Sands Corp. And chairman of its subsidiary, Sands China Ltd. He was a main reason the Mavericks traveled to Macao last month for the NBA China Games. Adelson owns Las Vegas Sands.

Since the 2023 sale, Dumont has overhauled the roster and front office. He appointed Rick Welts CEO after Cynt Marshall retired in 2024, approved the February 2025 trade of Luka Doncic, and oversaw the dismissal of general manager Nico Harrison. Dumont has since hired Ethan Casson as president, eight of the team's top 11 business-side senior managers, and Masai Ujiri as team president and alternate governor.

With full control now in hand, Dumont is moving ahead with plans for a new arena. The team is working toward opening a basketball-only venue and entertainment district at the former Valley View Mall site in 2031, when its lease at American Airlines Center runs out.

Casson will succeed Welts as CEO at the start of the calendar year.