The Purchasing Managers Index is one of the most important leading economic indicators, surveying purchasing managers monthly to gauge whether business conditions are expanding or contracting. Understanding how to read PMI data — and what ISM vs. S&P Global means — is essential for interpreting macro market signals.
The Purchasing Managers Index (PMI) is a monthly diffusion index based on surveys of purchasing professionals in manufacturing and services companies. Purchasing managers are particularly valuable survey respondents because they are the first in the corporate supply chain to see changes in demand — they receive orders from customers, then issue orders to suppliers. Changes in their purchasing behavior precede changes in production and employment by weeks to months, making PMI one of the best-available leading indicators of economic direction.
Survey respondents are asked each month whether each business condition is: better than last month, the same, or worse. The diffusion index formula is: PMI = % reporting improvement + 0.5 × % reporting no change. If 40% report improvement, 50% report no change, and 10% report worsening: PMI = 40 + 0.5 × 50 = 65. This means 65% of respondents see conditions as stable or improving. The 50-point threshold — where improvement equals worsening — is the key interpretive dividing line.
PMIs are available for approximately 40 countries and are one of the most internationally comparable economic indicators, allowing investors to compare economic momentum across the US, Eurozone, UK, China, Japan, and emerging markets on a standardized basis.
The US ISM Manufacturing PMI is a composite of five equally weighted sub-components, each calculated using the diffusion index formula:
Composite PMI = (New Orders × 0.30) + (Production × 0.25) + (Employment × 0.20) + (Supplier Deliveries × 0.15) + (Inventories × 0.10)
Note that Supplier Deliveries is the only sub-component where a reading below 50 is actually positive — slower supplier deliveries indicate manufacturers are overwhelmed with orders and working hard to fulfill them (demand is strong). This counterintuitive scoring exists because the original methodology treats delivery speed as a demand signal.
Survey respondents are a rotating panel of purchasing managers stratified to reflect the US manufacturing sector's industry and geographic distribution. ISM surveys approximately 400 respondents monthly. The survey is conducted in the third week of the reference month, with results released on the first business day of the following month. This speed of publication — before most other official economic statistics — contributes to its market-moving importance.
| Feature | ISM PMI | S&P Global PMI (Flash) |
|---|---|---|
| Publisher | Institute for Supply Management | S&P Global (formerly IHS Markit) |
| Coverage | US only (Manufacturing + Services) | US + ~40 countries globally |
| Sample size | ~400 companies (Manufacturing) | ~800 companies (US) |
| First available | Manufacturing: 1948; Services: 1997 | Manufacturing: 1996 |
| Release timing | 1st business day of following month | 3rd–4th week of reference month (Flash) |
| Flash vs. Final | No Flash — only one release | Flash (~22nd) + Final (1st business day) |
| Market focus | US; traditionally more market-moving | Global; Flash timing advantage |
| Key use | US economic cycle baseline (longer history) | Early signal + international comparison |
In practice, both series are published and tracked by market participants. The S&P Global Flash PMI arrives approximately 10 days earlier for each major economy, making it the first forward-looking indicator of the month — and therefore the immediate market mover. The ISM final reading provides additional depth (more sub-component detail) and carries more historical weight for long-run comparison.
| Sub-Component | Weight | What It Measures | Leading Signal? |
|---|---|---|---|
| New Orders | 30% | Incoming customer orders — most directly forward-looking component | Yes — strongest |
| Production | 25% | Actual manufacturing output in the reference month | No — coincident |
| Employment | 20% | Change in manufacturing headcount | Slight — lags new orders |
| Supplier Deliveries | 15% | Speed of supplier fulfillment (slower = expansionary score) | Yes — demand signal |
| Inventories | 10% | Changes in raw materials and finished goods stockpiles | Yes — with New Orders gap |
The New Orders component deserves emphasis: because orders must be fulfilled before production occurs, New Orders is the most forward-looking component in the composite. When New Orders rises sharply while the composite is still near 50, it signals impending improvement. When New Orders falls below 50 while the composite remains above (supported by prior-month production backlog), it signals impending weakening.
The New Orders − Inventories gap: if New Orders substantially exceeds Inventories (both sub-components), manufacturers must deplete existing stock and increase production. A gap of 10+ points between New Orders and Inventories is a strong signal of near-term production acceleration.
The 50-point threshold is the key interpretive rule, but the level and direction of movement beyond 50 both matter:
| PMI Range | Interpretation | Approx. GDP Growth Correlation |
|---|---|---|
| 60+ | Very strong expansion; capacity near limits; often unsustainable | >4% annualized |
| 55–60 | Strong expansion; solid growth across most sub-components | 3–4% |
| 50–55 | Moderate expansion; growth present but measured | 1–3% |
| 50 | Neutral; no net change from prior month | ~0–1% |
| 45–50 | Mild contraction; more negative readings than positive but marginal | 0 to -1% |
| 40–45 | Significant contraction; broad-based weakening | -1% to -3% |
| Below 40 | Severe contraction; rarely sustained, typically recession conditions | < -3% |
GDP correlation is for Manufacturing PMI and manufacturing sector output. Since manufacturing is ~11% of US GDP, PMI below 50 does not automatically mean overall GDP recession. Source: ISM, FRED, NBER historical analysis.
Manufacturing is approximately 11% of US GDP; services represent approximately 80% (with the remainder from agriculture, mining, and construction). For overall economic health assessment, the Services PMI is therefore more representative of the broader US economy.
The ISM Services PMI (released monthly on the 3rd business day of the following month) covers 15 service-sector industries: agriculture/mining, construction, utilities, wholesale trade, retail trade, transportation, information, finance/insurance, real estate, professional/business services, education, healthcare, arts/recreation, accommodation/food services, and public administration.
Key insight for 2022–2024: Manufacturing PMI fell below 50 in mid-2022 and remained depressed through late 2023, which many interpreted as a harbinger of recession. However, Services PMI remained above 50 throughout this period, reflecting the ongoing services-sector expansion driven by post-COVID leisure, travel, and hospitality recovery. Because Services dominates GDP and employment, the overall economy continued to grow despite manufacturing contraction.
The ISM Services PMI's Business Activity sub-component is the most directly comparable to the Manufacturing PMI's Production component, tracking actual current-month services output. The New Orders sub-component of Services PMI parallels Manufacturing New Orders as the forward-looking leading element.
S&P Global publishes PMIs for approximately 40 countries, enabling global economic comparison. Key global PMIs:
The Global Manufacturing PMI (a GDP-weighted composite of all country PMIs) provides the single best real-time indicator of worldwide industrial activity, closely tracked by commodity traders and global equity investors. Source: S&P Global Flash PMI Release Notes, ISM Manufacturing Report on Business (2026).
PMI data is among the first available monthly economic data for each country, giving it an outsized market impact relative to its status as a survey-based indicator. Key market dynamics:
The ISM Manufacturing PMI has a particularly strong historical correlation with S&P 500 industrial earnings. Manufacturing PMI below 47–48 for 3+ consecutive months has historically coincided with negative year-over-year earnings growth for the Industrials and Materials sectors. This relationship makes PMI a useful cross-check for earnings expectations when positioning in cyclical sectors.
As of mid-2026, key PMI readings:
Source: ISM Manufacturing Report on Business, S&P Global Flash PMI Releases, ECB Economic Bulletin (2026).
The Purchasing Managers Index is a monthly survey-based diffusion index measuring whether business conditions in manufacturing or services are expanding or contracting. A reading above 50 indicates expansion (more managers report improvement than decline); below 50 indicates contraction. It is a leading economic indicator because purchasing managers see demand changes before they appear in official economic data.
ISM (Institute for Supply Management) surveys ~400 US purchasing managers and has published Manufacturing PMI since 1948. S&P Global surveys ~800 US companies and publishes a Flash PMI ~10 days earlier than ISM. Outside the US, S&P Global's PMIs (covering ~40 countries) are the primary source. Both series are highly correlated but can diverge monthly.
New Orders (30% weight — most forward-looking), Production (25%), Employment (20%), Supplier Deliveries (15% — slower deliveries score higher as they signal demand exceeding supply), and Inventories (10%). The New Orders–Inventories gap is a secondary leading signal for near-term production trends.
Above 50: more purchasing managers report improvement than decline — conditions are expanding. Below 50: more report worsening — conditions are contracting. Distance from 50 matters too: 56 signals much stronger expansion than 51, and 44 signals deeper contraction than 49. Manufacturing PMI below 46 historically correlates with negative sector earnings growth.
The Services PMI covers the 80% of the US economy that is services — healthcare, financial services, retail, hospitality, professional services. Since services dominate GDP and employment, Services PMI above 50 can sustain overall economic growth even when Manufacturing PMI is below 50. A Services PMI drop below 50 is a much stronger recession warning than Manufacturing PMI alone.
The S&P Global Flash PMI is a preliminary monthly estimate based on ~85% of survey responses, released approximately the 3rd week of the reference month — about 10 days before ISM's final-month-first-business-day release. Because it arrives first, Flash PMI is typically the primary market-moving PMI release for each country.
PMI beats vs. consensus drive immediate market reactions: strong beats cause equities to rally, bond yields to rise, and currencies to strengthen; significant misses cause the opposite. Cross-border effects: weak China PMI depresses commodity prices; weak Eurozone PMI weakens EUR/USD. ISM Manufacturing below 47–48 for multiple months historically correlates with negative industrial and materials sector earnings growth.
The Eurozone Composite PMI (S&P Global) covers manufacturing and services across the 20-country Eurozone. Released as a Flash estimate (~22nd of the month), it is the primary early signal of Eurozone economic conditions. The ECB references it in policy discussions. Germany's sub-PMI is the most influential given Germany's role as Europe's largest economy and its manufacturing-led structure.
Not financial advice. PMI data and market reaction patterns are educational. Actual market reactions vary based on context, positioning, and global conditions. Sources: ISM, S&P Global, ECB, FRED, BIS. Consult a qualified financial professional before making investment decisions.