Nico Harrison is out as Dallas Mavericks general manager after three seasons, the franchise confirmed Tuesday. The departure closes a tenure that delivered a Finals appearance in 2024, a $177M payroll, and zero path to material cap relief before 2026. The assistant GM search is underway, according to two people briefed on the process.

Harrison joined Dallas in June 2021 from Nike, where he ran North American basketball operations. He inherited Luka Dončić on a rookie extension and immediately traded Kristaps Porziņģis to Washington, clearing $101M in future salary. He acquired Kyrie Irving for $126M over three years in February 2023, paired them to the Finals by June 2024, then watched Brooklyn's draft picks convey worse than projected. The Mavericks are $14M over the second luxury-tax apron this season, restricting trade flexibility and midlevel exceptions through at least July 2025.

The timing matters for three reasons. First, Dončić's supermax extension runs through 2027 at $54M annually by year five, and Irving's contract expires in 2026 with a $43M player option. The next GM inherits a two-year window with limited roster maneuverability and no first-round picks outbound until 2027. Second, Dallas is 19-21 through mid-January, sitting tenth in the West, and head coach Jason Kidd's future depends on whether the front office believes the Finals run was ceiling or outlier. Third, the Mavericks are valued near $4.5B after the Adelson and Dumont families bought majority control in December 2023, and ownership groups tend to reset basketball operations within eighteen months of closing.

The assistant GM search is being handled internally, with no executive recruiter retained as of Tuesday. The role will report to whichever permanent GM the Adelson-Dumont group hires, likely by March. Candidates are expected to come from front offices with cap-strapped, star-driven rosters—think Miami, Phoenix, or the Clippers' former structure under Michael Winger. The hire will signal whether Dallas plans to extend its window or begin the soft rebuild that follows a Dončić trade request, though no such request has been made or is considered likely before 2026.

Watch for three events in sequence. First, whether Dallas hires a permanent GM before the February 6 trade deadline or runs this season with interim leadership. Second, whether the new front office moves off Irving's expiring deal next summer or commits another $150M to retain him through age 35. Third, whether Kidd survives past April—his contract runs through 2026, but coaching changes in Dallas historically follow ownership transitions by fewer than 24 months.

The Mavericks have $201M in salary committed for 2025-26 before Irving's decision, the fourth-highest figure in the league. Harrison built that number in three years. His successor inherits it on day one.