**The Tongatapu 2 by-election, set for 8 October 2026, features nine candidates after nominations closed in early September.** The seat became vacant when former MP Semisi Sika was unseated following a upheld court ruling on campaign spending violations from the 2025 general election. Trader pricing reflects a fragmented field under first-past-the-post rules, with Alvin Lafu Sika (brother of the unseated member) holding the clearest lead at 43.5% implied probability while the next several candidates sit in single digits and the remainder trail further behind. The absence of ʻUhilamoelangi Fasi—who successfully petitioned against Sika and previously held the seat—has prevented any single contender from consolidating support. Withdrawals by three prospective candidates to back Malakai Koloamatangi illustrate vote-splitting dynamics, and the presence of multiple local figures plus three women candidates further disperses preferences. With roughly three weeks until polling, late endorsements, turnout in key villages, and any last-minute consolidation around frontrunners remain the main variables that could shift the current tight distribution of probabilities.