The September 2026 ISM Services PMI release on October 5 drove the market's near-certain positioning on the 54.0-54.9 range. Official data showed the headline index at 54.9, down 0.5 point from August's 55.4 but remaining in expansion territory for the 27th straight month. Key components included business activity at 56.5, new orders at 59.8, employment edging into expansion at 50.1, and supplier deliveries at 53.2, while the prices index climbed to 74 amid persistent input cost pressures from tariffs, fuel, and supply-chain strains. This outcome aligned closely with pre-release consensus near 55.0-55.2 and reinforced signals of moderate services-sector growth supporting GDP expansion. Any post-release revision or reinterpretation of the diffusion index methodology could theoretically shift resolution, though such adjustments remain rare once the ISM report is finalized.