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A PMI reading below 50 signals that the surveyed business activity declined compared with the previous month. It is a directional signal—not a percentage drop in output and not, by itself, proof that the economy is in recession. Businesses and investors should look at the survey’s components, provider, sector and trend before drawing conclusions.
What does a PMI reading below 50 mean?
PMI stands for Purchasing Managers’ Index. It is a diffusion index calculated from surveys of businesses. A reading of 50.0 indicates no change from the previous month in the measure covered; below 50 indicates deterioration or a decrease, while above 50 indicates improvement or an increase. S&P Global explains the PMI threshold and interpretation.
The distance from 50 indicates the strength of the reported direction of change, not the percentage by which output changed. For example, a reading of 48 does not mean output fell 2%. It means the survey points to deterioration, with the index’s level reflecting the balance of responses.
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Respondents report whether selected business conditions rose, fell or stayed the same. In S&P Global’s methodology, a higher response receives full weight, an unchanged response half weight and a lower response no weight. The resulting diffusion index summarizes the balance of answers rather than measuring the absolute amount of production or sales. S&P Global’s PMI FAQ describes the diffusion-index approach.
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Depending on the survey, components can include output, new orders, employment, costs, selling prices, exports, supplier performance, backlogs and inventories. The headline is useful for a quick read, but its components show where the reported weakness is concentrated. S&P Global’s PMI overview describes its data coverage and access.
What a sub-50 reading means for a business
For a business leader, a sub-50 PMI is a reason to check whether the survey’s demand and operating signals match conditions in the company’s own market. It is not a forecast for a particular company: the index reflects surveyed respondents and may not represent a firm’s customers, supply chain or geography.
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- New orders: Weakness can point to softer incoming demand. Check the firm’s order pipeline, cancellations and customer forecasts.
- Output and backlogs: Declining output alongside shrinking backlogs may suggest less work is waiting to be completed. Consider whether the change is broad or limited to one sector.
- Employment: A weaker employment component may indicate reduced hiring or staffing pressure among respondents; it does not establish what an individual company should do.
- Supplier performance and inventories: Review whether changes reflect demand, delivery conditions or inventory management rather than assuming a single cause.
- Costs and selling prices: These components can help distinguish demand softness from cost pressure or changes in pricing conditions.
Any response should follow the relevant components and the business’s own evidence. A single headline reading does not establish a universal action such as cutting investment, reducing staff or changing inventory targets.
What a sub-50 reading means for investors
For investors, PMI can provide timely evidence about surveyed business conditions and help frame risks to demand, employment, costs and company earnings. Use it as one input alongside company disclosures, other economic releases and official data—not as a stand-alone trading signal or recession call.
- Identify the series. Note the provider, country, sector and whether the figure is a headline index or a component.
- Check the components. Determine whether weakness is concentrated in orders, output, employment or another measure relevant to the companies or assets being assessed.
- Follow the trend. Compare the same provider and series across months, and note whether readings remain below 50 or move back toward expansion.
- Cross-check other evidence. Compare the survey with other PMI releases and official measures; survey readings can diverge from later reported data.
S&P Global’s June 2025 comparison reported that, over the period it examined, its manufacturing output index had a 69% correlation with the Federal Reserve’s manufacturing-production measure, versus 61% for the ISM manufacturing output index. These are figures from S&P Global’s historical comparison, not independent findings or a guarantee of future accuracy or investment performance. Read S&P Global’s comparison of ISM and S&P Global PMI data.
Why the provider and series matter
ISM and S&P Global PMI readings are not interchangeable. Their surveys differ in coverage, respondent roles, company-size representation, geography, panel size, seasonal adjustment, response weighting, headline calculation and historical data. When comparing readings, name the provider and keep the comparison within the same series and geography wherever possible. S&P Global’s 2025 comparison says its international methodology permits comparisons across its country PMI series; it says ISM manufacturing headline calculations are not internationally comparable. These are methodological descriptions from S&P Global’s analysis, not a claim that one provider is universally superior. S&P Global’s provider comparison.
Manufacturing and services PMIs also cover different business activity and use somewhat different questions. S&P Global says it introduced its services PMI in 1996 to help analysts and policymakers understand broader business conditions. A manufacturing reading below 50 should not be treated as a direct description of services activity, or vice versa. S&P Global’s FAQ on PMI coverage.
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ISM announced in September 2025 that its reports would use the name “ISM PMI Reports,” while retaining their scope, methodology and release cadence. ISM also said the 50.0 expansion/contraction baseline and continuity of its time series were unchanged. ISM’s September 2025 announcement.
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How broad is PMI coverage?
S&P Global says its PMI covers more than 40 countries, around 28,000 companies and 89% of global GDP. These are the provider’s stated global coverage figures on its FAQ page, not a claim that every country, company or economic activity is represented equally. S&P Global’s PMI FAQ.
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