May's PMI and Factory Orders Require Qualification Before You Use Them

The ISM Manufacturing PMI came in at 54.0 for May 2026, a four-year high, fifth consecutive month of expansion. Factory orders surged 4.8% in April to $62.7 billion, the largest monthly gain since May 2025. Both numbers look strong. Both require significant qualification.

On the PMI: 42% of ISM respondents directly cited the Iran conflict, and 69% of comments were negative. The supplier deliveries index hit 60.6%, its highest since 2022, that signals delivery slowdowns, not demand strength. The prices paid index held at 82.1. The expansion is being driven by defensive stockpiling ahead of tariff and supply disruption risk, not organic demand growth. When those inventories normalize, expect a PMI air pocket in Q3 or Q4.

On factory orders: the 4.8% headline is almost entirely a Boeing story. Commercial aircraft orders surged 165.9% after Boeing's best monthly gross order total of 2026. Outside that, non-defense capital goods excluding aircraft, the metric that tracks broad business investment, declined 1% in April, missing even the modest 0.4% forecast. Machinery orders rose only 0.7%. If your order book looks strong right now, audit how much of it traces to customer restocking versus genuine end-user demand before you build Q3 and Q4 assumptions on it.