Nico Harrison is out as general manager of the Dallas Mavericks after three seasons running basketball operations for the franchise Mark Cuban sold to the Adelson and Dumont families in a deal that valued the team at $3.8 billion. The timing—two months before the February trade deadline and six weeks before the ownership transfer formally closes—makes this the league's highest-stakes vacancy.

Harrison joined Dallas in June 2021 from Nike, where he spent 19 years building relationships across the player pipeline. His tenure delivered Luka Dončić's five-year, $215 million supermax extension, the Kyrie Irving trade that cost three rotation players and draft capital, and a Western Conference Finals appearance last season that ended in five games against Minnesota. The Mavericks are 22-19 this season, sixth in the West, with a defense ranked 23rd and a payroll approaching the second apron's $188.9 million threshold that restricts roster maneuvers.

The departure matters because the new ownership group inherits a capped-out roster built around two ball-dominant guards making a combined $80 million this season, a defensive identity that hasn't materialized, and a head coach in Jason Kidd whose contract runs through 2026-27. The Adelson family, which controls Las Vegas Sands and paid $2.8 billion in cash for their majority stake, brings Strip-scale capital expectations. Patrick Dumont, Miriam Adelson's son-in-law who is running the basketball side, has spent the past eight months embedded with the front office. His first visible move is now removing the executive who constructed the current core.

The search begins with constraints most franchises don't face. Dallas cannot offer full autonomy—Cuban retains basketball operations influence as a minority owner through 2028 under the sale terms. The new GM inherits Irving's $42 million player option for next season, Dončić's escalating supermax, and $31 million committed to rim-runner Dereck Lively II through restricted free agency. The trade deadline is 37 days away, and rival front offices are already texting about Dallas's willingness to move rotation pieces like Maxi Kleber or Josh Green to create flexibility.

Watch for Dumont to target executives with ownership-group fluency and luxury-tax management experience. Names circulating include Houston's Eli Witus, who navigated the Rockets' rebuild under Tilman Fertitta's cost discipline, and Denver's Calvin Booth, whose work under Walmart heir Ann Walton Kroenke includes two consecutive seasons above the second apron. The Mavericks' next move will signal whether the Adelson era prioritizes roster continuity or a painful reset around Dončić before his 2027 opt-out window opens. Kidd's job security, previously insulated by Cuban's loyalty, is now a dependent variable.

The interview process starts immediately. Cuban, who still controls day-to-day basketball decisions until the sale closes in mid-March, is expected to defer to Dumont on the hire, according to two people with knowledge of the transition structure.