The high implied probability of cancellation for the 2026 United Left primary stems from successive withdrawals and non-participation decisions that have left the process without sufficient backing. The Socialist Party opted in July 2026 for its own closed primary, La France Insoumise and the Communist Party declined involvement from the start, and candidates including Clémentine Autain stepped aside after the July vote. Les Écologistes later renounced the format in September, reducing the field to minimal participants such as François Ruffin and Marine Tondelier ahead of the October 11 date. These developments aligned with the market's resolution criteria for non-occurrence. A reversal would require an unanticipated official reversal by remaining organizers or a sudden expansion of participation in the final hours, though no such signals have emerged.