ISM Manufacturing PMI

The ISM Manufacturing Purchasing Managers' Index (PMI) is a monthly diffusion index that summarizes manufacturing sector conditions. A reading above 50 indicates expansion; below 50 signals contraction.

Why It Matters

The ISM Manufacturing PMI is one of the earliest indicators of economic activity each month, released on the first business day. It surveys over 300 purchasing managers on new orders, production, employment, supplier deliveries, and inventories.

Key Subcomponents

- New Orders: Leading indicator of future output

- Production: Current manufacturing activity

- Employment: Hiring/firing trends

- Supplier Deliveries: Supply chain conditions

- Prices Paid: Input cost inflation

Market Impact

A PMI above 50 is positive for equities and the dollar. A sharp drop below 50 raises recession fears and can trigger significant market moves. The Prices Paid subindex is closely watched for inflation signals.

ISM vs. S&P Global & the 50 Line

Two manufacturing PMIs exist for the U.S.—the ISM index described here and the S&P Global US Manufacturing PMI—and they can diverge month to month, so check which one a headline cites. Because manufacturing is only about 11% of U.S. GDP, a sub-50 ISM signals a factory slowdown rather than an economy-wide recession by itself; ISM has historically linked a reading near 42–43 to a broader downturn.

Official Source

The Institute for Supply Management (ISM) has published this report since 1948, making it one of the oldest economic indicators in the United States.

Term Guide: PMI (Purchasing Managers' Index)

The Purchasing Managers' Index is a diffusion index derived from monthly surveys of private-sector purchasing managers. A reading above 50 signals expansion; below 50 signals contraction. It is one of the most timely economic indicators, released on the first business day of each month.

Two Major Providers

In the U.S., ISM (Institute for Supply Management) publishes the Manufacturing PMI and Services PMI. S&P Global publishes competing versions with broader country coverage (50+ nations). ISM surveys roughly 400 firms across 18 industries; S&P Global surveys over 800.

Five Sub-Indices

The Manufacturing PMI is a weighted composite of: New Orders (30%), Production (25%), Employment (20%), Supplier Deliveries (15%), and Inventories (10%). New Orders is the most forward-looking component and often leads the headline by 1-2 months.

Why Markets Care

PMI is the earliest monthly snapshot of economic activity — released before most 'hard data.' A Manufacturing PMI below 50 for two or more consecutive months has historically coincided with or preceded recessions. The Services PMI matters more for the U.S. economy, where services represent ~77% of GDP (BEA).

Historical Context

U.S. ISM Manufacturing PMI plunged to 41.5 in April 2020 (ISM), its lowest since April 2009 (36.3). During the 2021 recovery, it surged to 63.7 — the highest since December 1983. Flash PMI (preliminary estimates released ~1 week before final) often moves markets due to its timeliness.

Key Nuance

PMI is a breadth indicator, not a magnitude indicator — it measures the share of firms reporting improvement, not the degree of improvement. A reading of 52 has the same weight whether firms grew 1% or 10%.

📊 ECONPLEX