ISM Manufacturing PMI (ISM Mfg)

The ISM Manufacturing Purchasing Managers' Index (PMI) is one of the oldest and most respected leading indicators for the U.S. economy, released on the first business day of every month at 10:00 AM ET. It's a diffusion index: readings above 50 indicate that the manufacturing sector is expanding, while readings below 50 indicate contraction. The index is derived from monthly surveys of purchasing managers at over 300 manufacturing firms.

While manufacturing represents only about 11% of U.S. GDP today — down sharply from historical levels — the ISM Manufacturing PMI punches far above its economic weight as a market mover because it's a leading indicator. It tells you where the cycle is going, not just where it's been. The new orders sub-index is the most closely watched component: when new orders are above 52, the manufacturing pipeline is filling and cyclical stocks tend to outperform. Below 48, and the opposite is typically true.

The prices paid sub-index serves as an inflation signal. When prices paid surge, it foreshadows cost pressures that could feed through to PPI and eventually CPI. The employment sub-index provides a preview for the manufacturing component of NFP.

For equity traders, a strong ISM Manufacturing print lifts industrials (XLI), materials (XLB), and transportation stocks. A multi-month streak below 50 — as seen in 2022–2024 — historically raises recession fears and benefits defensives, utilities (XLU), and bonds (TLT). However, in the 2022–2024 cycle, U.S. GDP remained resilient even as ISM Manufacturing contracted, reminding traders that services dominate the modern economy.