PMI

What Is the PMI?

The Purchasing Managers' Index (PMI) is one of the most valuable leading indicators in global finance, a real-time, survey-based measure of business activity that provides the earliest signal of where the economy is heading. While GDP tells you where the economy was and NFP tells you where the labour market is, PMIs tell you where the economy is going, making them uniquely valuable for traders who need to position ahead of the cycle.

PMIs are "diffusion indices" based on monthly surveys of purchasing managers, the executives responsible for buying raw materials, managing supply chains, and monitoring production schedules. These managers are the first to see changes in demand: when orders are rising, they know before the GDP data does. When demand is falling, they cut orders before the headlines catch up.

The index is constructed so that 50 is the dividing line: above 50 signals expansion, below 50 signals contraction. The further the reading from 50, the faster the pace of change. A PMI of 55 signals brisk expansion; 45 signals sharp contraction; 50 means no change.

The PMI Ecosystem: Which Surveys Matter

US Manufacturing PMI (ISM Manufacturing)

The ISM Manufacturing PMI is the granddaddy of all PMIs and remains the most closely watched despite manufacturing being only ~11% of US GDP. Its importance comes from three factors: (1) the 75-year history allows robust pattern recognition, (2) manufacturing is the most cyclical sector and turns before services, and (3) the sub-indices (especially New Orders and Prices Paid) provide actionable forward-looking signals.

Critical thresholds:

• Above 55: Strong expansion; confirms economic growth; bullish for cyclicals
• 50-55: Moderate expansion; economy growing at or above trend
• 48-50: Technical contraction in manufacturing; economy may still grow overall
• 45-48: Significant manufacturing recession; economy at stall speed
• Below 45: Deep contraction; broad recession almost certain; historically coincides with S&P 500 bottoms

US Services PMI (ISM Services / NMI)

ISM Services has become arguably more important than Manufacturing because the US economy is overwhelmingly services-driven. A sub-50 ISM Services reading is a genuinely alarming signal, it has only occurred during the most severe economic downturns (2008, 2020, and briefly in 2022).

The ISM Services Prices Paid sub-index is particularly important for inflation: services inflation is the "stickiest" component (driven by wages), and the ISM Services Prices Paid reading provides a real-time forward signal for services CPI and services PCE.

S&P Global Flash PMI

The S&P Global Flash PMI has become increasingly important because of its timing advantage. Released mid-month, it gives traders a 2-3 week head start on the ISM release. When the flash diverges significantly from the prior ISM, the ISM release typically confirms the flash's direction, creating a tradable signal.

China PMI Complex

China publishes two sets of PMIs that move global commodity and EM markets:

When NBS and Caixin diverge, it signals a split between the state sector (SOEs) and the private sector. Caixin is generally more trusted by international investors because it's independently compiled and focuses on the export-oriented private sector that drives commodity demand.

Market impact: China PMI above 51 is bullish for copper, iron ore, AUD, and EM equities. Below 49, those assets face headwinds.

Eurozone PMI

The eurozone flash PMI (released by S&P Global) provides the earliest read on European growth and is a critical input for ECB policy expectations. German manufacturing PMI is particularly watched because Germany is the eurozone's industrial engine, sustained German manufacturing below 45 signals European recession risk.

The Sub-Indices: Where the Real Signal Lives

New Orders (Most Important)

The New Orders sub-index is the single most forward-looking component of any PMI. New orders lead production by 1-2 months and GDP by 2-3 months. When new orders diverge from the headline, trust new orders.

The New Orders-Inventories Spread: Calculated as (New Orders sub-index) minus (Inventories sub-index). This is one of the most powerful cyclical indicators in all of economics:

Prices Paid (Inflation Signal)

Prices Paid measures input cost inflation as reported by purchasing managers, how much more (or less) they're paying for raw materials, components, and services.

This sub-index leads CPI goods inflation by approximately 2-4 months. When ISM Prices Paid surges above 70, goods inflation is accelerating. When it drops below 50, goods deflation is underway.

Key history: ISM Manufacturing Prices Paid surged from 55 to 92 between December 2020 and June 2021, one of the most extreme spikes in the survey's history. It predicted the CPI goods inflation wave of 2021-2022 with remarkable accuracy. The subsequent collapse to 38 by December 2022 correctly predicted the goods disinflation of 2023.

Employment

The employment sub-index tracks hiring intentions and has historically been a reasonable predictor of NFP manufacturing employment. However, the relationship has weakened post-COVID as labour market dynamics shifted (labour hoarding, immigration, retirement wave).

Supplier Deliveries

Measures how quickly suppliers are delivering materials. Higher readings mean slower deliveries, which typically signals strong demand (supply chains under pressure). During the 2021 supply chain crisis, the Supplier Deliveries sub-index spiked to levels not seen since 1974, correctly flagging the supply-driven inflation that followed.

Historical PMI Patterns and Market Returns

The ISM Manufacturing Cycle and Equity Returns

Academic and practitioner research has documented a strong relationship between ISM Manufacturing and S&P 500 returns:

The key insight: The best equity buying opportunities occur when ISM Manufacturing is below 45 and either stabilising or beginning to rise. This has coincided with major S&P 500 bottoms in 2001, 2009, 2020, and 2022. The market typically bottoms 2-3 months before the ISM trough.

The Manufacturing-Services Divergence

When ISM Manufacturing is contracting (below 50) while ISM Services is expanding (above 50), the economy is experiencing a "rolling recession" in manufacturing while the broader services economy supports growth. This was the dominant pattern in 2022-2023 and is typically resolved by either:

1. Manufacturing recovery (services pulls manufacturing back up → economy accelerates → bullish)
2. Services contagion (manufacturing weakness spreads to services → broad recession → bearish)

Tracking which resolution is occurring (via the direction of services PMI) is one of the most valuable signals for asset allocation.

Trading PMI: A Practical Framework

Release Day Strategy

ISM Manufacturing (10:00 AM ET, 1st business day): The market has usually digested the S&P Global flash PMI from 2 weeks earlier. The ISM release moves markets primarily when it diverges from the flash or when the sub-indices (New Orders, Prices Paid) surprise.

ISM Services (10:00 AM ET, 3rd business day): Often more impactful because there is less advance signal (the S&P Global Services flash is less reliable than the manufacturing flash). Services PMI surprises move equities, bonds, and the dollar simultaneously.

Cross-Asset PMI Reaction Matrix

The PMI Momentum Strategy

One of the simplest and most effective macro trading strategies:

• When ISM Manufacturing is above 50 and rising: Overweight global cyclicals (industrials, materials, energy, small-cap value). This regime has produced ~18% annualised equity returns historically.
• When ISM Manufacturing is below 50 and falling: Overweight defensives (healthcare, utilities, consumer staples) and Treasuries. Underweight cyclicals and commodities.
• Rebalance monthly on ISM release day.

What to Watch

1. S&P Global Flash PMI (mid-month): The earliest signal; if it diverges from the prior ISM by >2 points, the ISM is likely to surprise in that direction.
2. ISM Manufacturing New Orders (monthly): The single best leading economic indicator. Track the direction, not just the level.
3. ISM Services Prices Paid (monthly): The best forward signal for services inflation, the "stickiest" inflation component.
4. China Caixin Manufacturing PMI (1st business day): The key signal for global commodity demand and EM asset allocation.
5. Eurozone flash PMI (mid-month): Critical for EUR/USD positioning and ECB policy expectations. German manufacturing PMI is the bellwether.