Zohran Mamdani assumed office as New York City mayor on January 1, 2026, following his 2025 Democratic primary upset and general election victory with over 1.1 million votes. Trader consensus on the low probability of an early exit reflects his active governance through mid-2026, including delivery on rent stabilization, initial universal childcare expansions, budget deficit closure with state aid, infrastructure projects, and hosting the Urban 20 summit. Approval indicators such as Siena polling and management reports show steady support among key Democratic constituencies, with no major scandals, legal actions, or institutional challenges to his term emerging. A departure before 2027 would require resignation, a rare recall process, or unforeseen health or legal developments, none of which current primary-source reporting or scheduled events like his planned meeting with President Trump indicate as likely.