PMI Guide: How to Read the Purchasing Managers’ Index & What It Signals
Understanding the PMI Scale
| PMI Reading | Interpretation | Economic Signal |
|---|---|---|
| Above 55 | Strong expansion | Economy growing robustly — potential inflation pressure |
| 50-55 | Moderate expansion | Healthy growth, sustainable pace |
| 50 | Neutral dividing line | No growth, no contraction |
| 45-50 | Moderate contraction | Slowdown — not necessarily a recession |
| Below 45 | Significant contraction | Strong recession signal — historically rare for sustained periods |
| Below 40 | Severe contraction | Deep economic distress (seen in 2008, early 2020) |
The Two Main US PMI Reports
| Feature | ISM PMI | S&P Global PMI (Markit) |
|---|---|---|
| Publisher | Institute for Supply Management | S&P Global (formerly IHS Markit) |
| History | Since 1948 — longest-running economic survey | Since 2007 — more recent but globally consistent |
| Coverage | US only | 50+ countries (comparable methodology) |
| Manufacturing Release | First business day of each month | Flash estimate mid-month; final on first business day |
| Services Release | Third business day of each month | Flash and final alongside manufacturing |
| Market Impact | Higher (longer history, more trusted for US) | Moderate (valued for global comparisons and flash readings) |
PMI Sub-Indices: What to Watch
The headline PMI is a composite, but the sub-indices tell you why the number moved. Each sub-index tracks a specific dimension of business activity:
| Sub-Index | What It Tracks | Why Investors Watch It |
|---|---|---|
| New Orders | Volume of new customer orders | Most forward-looking component — leads the overall PMI |
| Production/Output | Current output levels | Confirms whether demand is translating to activity |
| Employment | Hiring and layoff intentions | Leading indicator for the monthly jobs report |
| Supplier Deliveries | Speed of vendor deliveries (slower = busier supply chains) | Supply chain stress indicator — higher = bottlenecks |
| Inventories | Stock levels at factories/businesses | High inventories can signal future production cuts |
| Prices Paid | Input costs faced by businesses | Leading inflation indicator — rising input costs lead to consumer price increases |
| New Export Orders | International demand for US goods | Global trade and demand signal |
| Backlog of Orders | Unfilled orders accumulating | Demand strength — high backlogs signal pricing power |
Manufacturing PMI vs. Services PMI
Manufacturing PMI gets more attention historically, but the US economy is roughly 80% services. The Services PMI (ISM calls it the “Services ISM Report on Business”) is arguably more important for gauging overall economic health. When manufacturing contracts but services expand, the economy usually avoids recession. When both contract, recession risk is elevated.
Manufacturing PMI tends to be more volatile and globally connected (export orders, commodity prices). Services PMI is more domestic-focused and closely tied to consumer spending, employment in the services sector, and wage dynamics.
How PMI Moves Markets
| PMI Outcome | Bond Market | Stock Market | Dollar |
|---|---|---|---|
| Above-consensus expansion | Treasuries weaken (yields rise) | Cyclical stocks rally, growth may lag | Strengthens |
| Below-consensus or contraction | Treasuries rally (yields fall) | Defensives outperform, cyclicals sell off | Weakens |
| Prices Paid sub-index surges | Inflation fears — yields spike | Sell-off in rate-sensitive sectors | Strengthens on Fed hiking expectations |
| Employment sub-index drops | Rally on easing expectations | Mixed — recession fear vs. rate cut hope | Weakens |
PMI as a Leading Indicator
PMI is considered one of the best leading indicators for several reasons. Purchasing managers sit at the front of the supply chain — they see order changes before they show up in revenue or GDP data. The survey methodology captures direction and speed of change, not just levels. And because it’s released early in the month (covering the prior month), it provides one of the first reads on economic conditions.
Research shows the ISM Manufacturing PMI has a strong correlation with GDP growth. A sustained reading above 50 is associated with economic expansion. Historically, a PMI persistently below 43-45 has signaled recession — though this threshold isn’t exact and should be combined with other indicators like the yield curve and labor market data.
Global PMI: Why It Matters for US Investors
S&P Global publishes PMI data for over 50 countries using consistent methodology, making cross-country comparison possible. The Global Composite PMI provides a snapshot of worldwide economic momentum. For US investors, global PMI matters because multinational companies in the S&P 500 derive ~40% of revenue from overseas. A collapsing European or Chinese PMI signals trouble for US exporters and globally exposed sectors.
Key Takeaways
- PMI measures manufacturing and services sector health on a 0-100 scale, with 50 as the expansion/contraction dividing line.
- The ISM PMI (since 1948) is the most watched US version; S&P Global PMI offers global comparisons and earlier flash readings.
- Sub-indices — especially New Orders, Prices Paid, and Employment — often matter more than the headline number.
- Services PMI is arguably more important than Manufacturing PMI for the 80%-services US economy.
- PMI is a leading indicator: it reflects changes in business conditions before they appear in GDP, employment, or earnings data.
Frequently Asked Questions
What does PMI stand for?
PMI stands for Purchasing Managers’ Index. It’s based on surveys of purchasing managers — the executives responsible for buying raw materials, components, and services for their companies. Because these managers are among the first to see shifts in demand and supply conditions, their collective assessment provides an early read on economic direction.
Is a PMI of 49 bad?
A PMI of 49 indicates slight contraction — business conditions are marginally worse than the prior month. It’s not catastrophic, and the economy can absorb brief dips below 50 without entering recession. The trend matters more than any single reading. A move from 52 to 49 is more concerning than a stable reading hovering around 49-50. Sustained readings below 45 are the real recession signal.
How is the PMI calculated?
PMI is a diffusion index. Survey respondents report whether conditions improved, stayed the same, or deteriorated. The index equals the percentage reporting improvement plus half the percentage reporting no change. So if 40% say better, 35% say same, and 25% say worse: PMI = 40 + (35 × 0.5) = 57.5. This methodology captures direction and breadth of change across the economy.
What’s the difference between flash and final PMI?
S&P Global releases a “flash” PMI estimate around the third week of each month based on approximately 85% of total survey responses. The final reading, released on the first business day of the following month, includes all responses. The flash reading moves markets because it provides the earliest read on monthly economic conditions — even before the month ends.
How does PMI relate to the stock market?
PMI is positively correlated with stock market performance, especially for cyclical sectors. Rising PMI supports corporate earnings expectations and risk appetite. Falling PMI signals earnings downgrades ahead. However, the relationship isn’t linear — extremely high PMI readings can signal overheating and Fed tightening, which can be negative for rate-sensitive growth stocks. The sweet spot for equities is steady PMI in the 52-56 range.