The closely contested trader consensus around António Guterres leaving office by December 31, 2026, stems from the ongoing UN Secretary-General selection process amid his second term's scheduled end. The Security Council has conducted informal straw polls with no candidate securing the required support to avoid vetoes from permanent members, leaving frontrunners such as Rebeca Grynspan, Carolyn Rodrigues-Birkett, and Rafael Grossi in a fragmented field drawn largely from the Latin American and Caribbean group under informal regional rotation norms. U.S. opposition to any temporary extension beyond the term, combined with P5 divisions and the need for General Assembly approval, creates procedural uncertainty that could delay a successor's appointment. Recent General Assembly sessions and diplomatic statements have underscored the timeline pressure without resolving the deadlock, while historical patterns show most secretaries-general serve no more than two terms. Factors that could shift probabilities include a breakthrough straw poll, veto alignment among permanent members, or explicit signals on extension from key capitals before year-end.