The Tongatapu 2 by-election, set for 8 October 2026, features nine registered candidates after the Supreme Court upheld bribery and campaign spending convictions against the 2025 winner Semisi Sika, vacating the seat and barring him from contesting for five years. Trader prices reflect a fragmented field, with Sione Harvard Tupouniua, ‘Olioni Manoa, ‘Ilaisa Lepolo Taunisila, and Malakai Koloamatangi clustered near the top amid low differentiation in early positioning. Recent withdrawals by three prospective entrants to consolidate behind Koloamatangi, combined with three women candidates and the absence of the prior runner-up, have kept implied probabilities tightly bunched. No public polling or major endorsements have yet emerged to separate contenders ahead of the vote, leaving outcomes dependent on local turnout patterns and last-minute alliances in the single-member constituency.