Purchasing managers’ indices, or PMIs, are among the most closely watched economic surveys in the world. They arrive in two stages: a flash estimate late in the month and a final reading at the start of the next. Most of the attention goes to the flash figure, but the final reading can still move markets, especially when it differs from the first estimate.
What a PMI measures
A PMI is based on a monthly survey of purchasing managers at companies in manufacturing or services. They are asked whether conditions such as output, new orders, employment, prices and supplier delivery times are better, the same or worse than the month before. The answers are combined into an index where 50 separates expansion from contraction. Above 50 suggests activity is growing; below 50 suggests it is shrinking.
Flash versus final
The flash PMI is published around the third week of the month and is based on most, but not all, survey responses. The final PMI arrives a week or so later, usually on the first working days of the following month, and includes the full set of responses. For manufacturing it typically comes out on the first business day; for services a couple of days later. Our explainer on flash PMIs explains the first stage.
Why the final reading can still matter
Most of the time, final PMIs are close to the flash estimates and markets barely react. But revisions do happen. If the final figure is noticeably weaker or stronger than the flash, it can change the story. A manufacturing PMI revised from just above 50 to below it, for instance, turns a small expansion into a contraction, and that can affect currencies and bond yields.
The final release also contains details the flash report does not, including more country breakdowns in Europe and fuller information on prices and employment. Traders watching inflation pay close attention to input and output price components, because they hint at future price pressures.
How markets react
A weaker than expected final PMI can weigh on a currency and push bond yields lower, as traders anticipate slower growth or easier policy. A stronger reading can do the opposite. The effect is usually modest compared with the flash release, but on a quiet day it can set the tone. Our latest Morning Market Brief lists today’s PMI releases and why they matter.
How traders use final PMIs
Traders compare the final figure with both the flash estimate and the consensus forecast. They look at the direction of revisions and the components, rather than the headline alone. In the US, the ISM manufacturing index, published on the same day, is often more market-moving than the final S&P Global PMI, so traders watch both together.
The beginner takeaway
The final PMI is the second look at the same survey. It rarely changes the story, but when it does, the surprise is in the revision. Know the flash number before the final one comes out.
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