What is the ISM Manufacturing PMI?
The Purchasing Managers' Index (PMI) is built from a monthly survey of purchasing and supply executives at U.S. manufacturers. They report whether new orders, production, employment, supplier deliveries and inventories are higher, the same or lower than the month before.
Their answers are combined into a diffusion index. The key line is 50: above 50, more companies see growth than decline, so manufacturing is generally expanding; below 50, it is generally contracting. How far the reading is from 50 hints at how broad the change is.
Why markets pay attention
It is one of the first important readings of each month, published on the very first business day. New orders often hint at where production is heading, and the prices component gives an early signal about cost pressure.
Manufacturing is a smaller part of the U.S. economy than services, but it reacts quickly to changes in demand, interest rates and trade — so the index is often watched as an early indicator of the business cycle.
ISM Manufacturing and factory activity
The ISM Services PMI, published two business days later, covers the much larger services side. Read together, the two surveys give an early picture of business activity that later shows up in GDP.
Actual, Forecast and Previous
Every release on an economic calendar comes with three numbers:
- Actual
- The result just published. Nobody knows it until the release.
- Forecast
- The consensus of economists, known in advance — what the market largely expects and has already priced in.
- Previous
- The result for the prior period (sometimes revised). Useful context, but not what markets mainly react to.
Surprise = Actual − Forecast
The key point: markets react mainly to how far the Actual lands from the Forecast — the surprise — not to the change from the Previous value.
Actual > Forecast
Higher than expected.
Actual ≈ Forecast
About as expected — usually the smallest reaction.
Actual < Forecast
Lower than expected.
None of these comparisons decides the EUR/USD direction on its own. Whether "higher" is good or bad news depends on the indicator (more jobs usually reads as strength, more jobless claims as weakness), on the size of the surprise and on the market context.
How an ISM Manufacturing surprise is usually read
An Actual above the Forecast signals stronger factory activity. Historically, that has more often supported the U.S. dollar — for EUR/USD, usually a move lower. An Actual below the Forecast has more often had the opposite effect.
Crossing 50 can draw extra attention: a move from contraction into expansion, or the other way round, is easy for the market to notice. The sub-indexes — especially new orders and prices — can change how the headline is read.
A simple example
Hypothetical numbers: Previous 48.7, Forecast 49.2, Actual 50.4. The surprise is +1.2 points, and the index moved above 50 — the survey now points to expansion rather than contraction.
If the prices component also jumped, the market may read the report not only as stronger activity but also as a sign of rising cost pressure — two messages that can reinforce each other.
Why the same number can move markets differently
The size of the surprise matters
A result slightly off the Forecast may barely register, while a big miss can force a real rethink. Larger surprises have tended to produce larger and more consistent reactions — but not always.
Context changes over time
When inflation is the market's main worry, inflation data dominates; when growth is the worry, jobs and activity data can matter more. What the market already expects from the Federal Reserve also shapes how a surprise is read.
Details and revisions
Headlines come with details — revisions to earlier months, sub-components, other figures released at the same moment. They can confirm the headline or contradict it.
The first reaction is not the final one
The first move reflects the headline in the first seconds. As participants read the details, the market can extend that move, stall or reverse within minutes.
History is a guide, not a guarantee
Past releases show how markets have tended to react, which is useful. But every release happens in a new context, and past behavior does not guarantee the next reaction.
How to read EUR/USD
EUR/USD shows how many U.S. dollars one euro buys, so it tends to move opposite to the dollar: when the dollar strengthens, EUR/USD usually falls, and when it weakens, EUR/USD usually rises. Pairs where the dollar comes first, such as USD/JPY, tend to move with the dollar.
How NEXTMarketReaction reads this release
When a ISM Manufacturing PMI release is published, NEXTMarketReaction combines:
- the Actual, as soon as it is published;
- the Forecast (consensus) and the Previous value;
- the surprise — how far, and in which direction, the Actual landed from the Forecast;
- how EUR/USD has behaved after comparable ISM Manufacturing PMI releases in the past;
- calibrated historical probabilities, adjusted so that the percentages reflect how often similar situations actually played out;
- the horizon: 1, 3, 5, 8 or 15 minutes after the release.
The UP/DOWN percentage you see is a probability estimate based on history and a statistical model — not a certainty and not a recommendation. Even a high percentage leaves the opposite outcome possible.