ISM Services Business Activity
A monthly survey index showing whether U.S. service businesses report expanding or contracting activity.
Full explanation
The ISM Services Business Activity Index measures whether activity at U.S. service-sector businesses is increasing or decreasing. It is based on a monthly survey of purchasing and supply executives and is expressed as a diffusion index, where readings above 50 generally indicate expansion and readings below 50 indicate contraction. The index captures the breadth of reported changes in business activity rather than the dollar value or physical volume of service-sector output. It is a seasonally adjusted component of the ISM Services PMI Report.
Why traders watch it
Services make up a large share of the U.S. economy, so the index can provide a timely read on business momentum. It may affect expectations for growth, inflation pressure and the policy outlook, which can influence U.S. dollar and interest-rate markets.
Market interpretation
- U.S. dollar
- Can move as markets reassess the strength of U.S. activity and the possible policy outlook.
- U.S. Treasury yields
- Can influence rate expectations, particularly when the result differs materially from forecasts.
- U.S. equity index futures
- Can affect views of economic demand and business conditions, with the response dependent on the wider report.
Stronger vs weaker outcomes
A reading above expectations or a rise in the index may be interpreted as broader service-sector activity, while a weaker-than-expected reading may be interpreted as softer momentum. The market response can also depend on the report's new orders, employment and prices components.
A higher reading, particularly one above expectations, may suggest that service-sector activity is expanding more broadly than markets anticipated.
A lower reading, particularly one below expectations, may suggest softer or less widespread service-sector activity than markets anticipated.
Readings above 50 generally indicate expansion, while readings below 50 generally indicate contraction.
Typical volatility
Moderate. This is a survey-based breadth measure, not a direct measure of service-sector output. The 50 threshold is important, but the size, persistence and drivers of a move can matter more than a single monthly change.
Trading considerations
- Check the headline ISM Services PMI alongside the Business Activity Index.
- Compare the result with market expectations and the prior reading.
- Watch New Orders, Employment and Prices for context on demand, labor conditions and cost pressures.
- Expect spreads and short-term price swings to widen around a scheduled high-attention U.S. data release.
- Treat a single survey result cautiously and consider whether the move is sustained over several months.
Educational guidance only — never a trading signal or recommendation.
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