The stability of the current nine-member Supreme Court bench, with no announced retirements or reported health developments prompting departures, drives trader consensus toward no vacancy in 2026 at 65.5% implied probability. All justices remain active, including the oldest members Clarence Thomas and Samuel Alito, without public indications of strategic timing tied to Senate control, presidential transitions, or other political factors. Historical patterns show vacancies often align with electoral cycles or personal circumstances, yet the absence of recent catalysts such as confirmation hearings, medical disclosures, or institutional pressures supports the market's assessment of lower likelihood over the calendar year.