ISM Manufacturing PMI

At A Glance#

Field	Detail
Provider	Institute for Supply Management (ISM)
Survey / Tool	Report on Business (ROB) — Manufacturing Survey
Frequency	Monthly — released on the first business day of the month
Indicator Type	Leading
Main Use	Gauges the health of the U.S. manufacturing sector; signals where the broader economy is heading
Timeframe Tracked	Short-Term (1–6 months)
Source	https://www.ismworld.org/supply-management-news-and-reports/reports/ism-pmi-reports/pmi/march/

What It Is#

ISM Manufacturing PMI is a monthly diffusion index measuring U.S. manufacturing sector activity. It is based on survey responses from purchasing and supply executives nationwide. Because factories must order raw materials and ramp up production before goods hit store shelves, this indicator tells you where the broader economy is heading rather than where it already is.

For how PMI and the diffusion index formula work, see PMI Diffusion Index Explained.

Who Provides It#

The Institute for Supply Management (ISM), via the Report on Business (ROB) Manufacturing Survey. ISM has published this report since 1948 — it is the legacy U.S. standard that the Federal Reserve and domestic traders follow most closely.

How It Is Collected#

• ISM sends surveys to its Manufacturing Business Survey Panel in the first part of each month.
• Respondents report on U.S. operations only for the current month.
• The panel is stratified by NAICS industry categories and weighted based on each industry's contribution to GDP.
• Respondents indicate whether each activity is higher, the same, or lower compared with the previous month.

Industries covered (18 total):

• Food, Beverage & Tobacco Products
• Textile Mills
• Apparel, Leather & Allied Products
• Wood Products
• Paper Products
• Printing & Related Support Activities
• Petroleum & Coal Products
• Chemical Products
• Plastics & Rubber Products
• Nonmetallic Mineral Products
• Primary Metals
• Fabricated Metal Products
• Machinery
• Computer & Electronic Products
• Electrical Equipment, Appliances & Components
• Transportation Equipment
• Furniture & Related Products
• Miscellaneous Manufacturing

How It Is Computed#

ISM converts survey responses into a diffusion index for each component:

$\text{Index} = \%\ \text{positive responses} + 0.5 \times \%\ \text{unchanged responses}$

The headline ISM Manufacturing PMI is an equal-weighted composite of five sub-indexes, each carrying 20% weight:

Sub-Index	Weight	What It Captures
New Orders	20%	Demand pipeline — most forward-looking component
Production	20%	Current factory output activity
Employment	20%	Hiring/firing decisions by manufacturers
Supplier Deliveries	20%	Speed of supply chain; slower = more demand pressure
Inventories	20%	Stock levels; rising inventories signal caution

Reading the number:

• Above 50 → manufacturing generally expanding
• Below 50 → manufacturing generally contracting

Indicator Type#

Leading. ISM states that diffusion indexes have the properties of leading indicators. Manufacturing PMI captures changes in new orders, production plans, employment, supplier deliveries, and inventories before many official activity data are released. Because factories plan and order ahead of production, the data leads actual economic output by weeks to months.

Why It Matters#

ISM Manufacturing PMI is one of the most closely watched early-cycle signals. A sustained move above 50 typically precedes broad economic expansion; a drop below 50 — especially in New Orders — can warn of a coming slowdown before it shows up in GDP or payroll data.

The Federal Reserve and domestic traders pay particular attention to this release because of its 70+ year history and because it covers the sector most sensitive to the economic cycle.

ISM vs S&P Global#

Both ISM and S&P Global publish a manufacturing PMI. Key differences:

Feature	ISM Manufacturing	S&P Global Manufacturing
Panel size	~400 companies	~600 companies
Component weights	Equal (20% each)	Unequal (New Orders 30%, etc.)
Flash release	No — one final release	Yes — Flash mid-month, Final next month
Market focus	Domestic Fed/trader benchmark	International comparison benchmark

See PMI Diffusion Index Explained for the full ISM vs S&P Global breakdown.

Related Notes#

• ISM Services PMI — services sector counterpart from the same provider
• S&P Global Manufacturing PMI — alternative manufacturing gauge; larger panel, unequal weights, Flash release
• PMI Diffusion Index Explained — diffusion index formula and ISM vs S&P Global comparison

Sources#

• ISM Manufacturing PMI Report