American factories are humming at a pace not seen in four years. The ISM Manufacturing PMI climbed to 54.0 in May 2026, its highest reading since May 2022, extending what is now a five-month streak of expansion for a sector that spent the prior year in contraction territory.

Think of the PMI like a thermometer for manufacturing health. Anything above 50 signals growth, anything below signals shrinkage. At 54.0, the sector isn’t just growing. It’s growing with conviction.

And yet, the people actually running these factories are in a decidedly sour mood. A full 57% of survey respondents flagged pricing volatility as a major headache, while 42% pointed to the ongoing conflict in Iran as a source of genuine anxiety.

Inside the numbers

The recovery started in January 2026, when the PMI registered 52.6 after 12 consecutive months of contraction. Since then, each month has stayed above the 50 threshold, building a growth streak that now ranks as the longest sustained expansion in roughly four years.

New orders came in at 56.8 for May, a strong signal that demand pipelines remain healthy. Production clocked in at 54.3, keeping pace with the broader expansion narrative.

Supplier deliveries hit 60.6. Higher supplier delivery readings indicate slower deliveries, which typically reflects supply chains under strain. Suppliers are taking longer to fulfill orders, either because demand is outstripping capacity or because logistical bottlenecks are creeping back in.

Employment in the manufacturing sector remained stuck in contraction at 48.6. Factories are producing more, booking more orders, and still not hiring. That’s a pattern that suggests companies are squeezing more productivity out of existing workforces rather than committing to headcount expansion.

The ISM prices index sat at 82.1 in May, down slightly from 84.6 in April but still uncomfortably elevated. At 82.1, manufacturers are paying significantly more for raw materials, components, and energy than they were a year ago.

Why factories are growing but leaders aren’t smiling

Tariffs continue to feature prominently in manufacturer feedback. Combined with geopolitical uncertainty, particularly around the Iran conflict that 42% of respondents identified as a top concern, companies are filling orders and expanding production while absorbing higher costs and navigating unpredictable trade policy.

The fact that employment hasn’t crossed back above 50 despite five months of overall growth tells you everything about current management philosophy. Companies are treating this expansion as something that could reverse, not as the start of a durable upcycle.

What this means for investors and markets

The elevated prices index at 82.1 is the number that should keep investors alert. Persistent input cost inflation puts pressure on the Federal Reserve’s rate calculus. If manufacturers keep reporting high costs, the case for rate cuts weakens, and tighter monetary conditions tend to dampen enthusiasm for speculative assets, crypto included.

A 42% mention rate for a single geopolitical issue in a manufacturing survey is notably high, and it signals that this concern is not abstract for the people managing real supply chains and real capital.

Industrial equities and manufacturing-adjacent plays may benefit from the strong new orders reading of 56.8. That’s forward-looking demand, not just current activity.

The employment reading of 48.6 also matters for the broader economic conversation. If manufacturing can sustain expansion without meaningful job creation, the labor market narrative gets more complicated.