Traders assign the highest implied probability to the ISM Services PMI for September 2026 landing in the 53.0-53.9 range, driven by resilient services-sector activity, steady new orders, and moderating price pressures amid a still-solid labor market. Recent readings on business activity and supplier deliveries have supported expansion above the 50 threshold, yet softening employment components and mixed consumer spending data introduce uncertainty that spreads probabilities across the 53-57 corridor. With no outcome exceeding 28% consensus, positioning reflects the closely contested outlook ahead of the release, where revisions to prior months or shifts in Fed rate expectations could quickly alter the distribution.