KEY POINTS
- The Chicago Business Barometer surged 13.5 points to 62.7 in May, its highest level in four years, demolishing the consensus estimate of 50.5.
- The jump from 49.2 in April to 62.7 — from contraction to robust expansion in a single month — is the kind of swing that historically foreshadows a move higher in the national ISM Manufacturing PMI.
- The ISM Manufacturing PMI for May releases today at 10 a.m. ET; the prior reading of 52.7 was already the highest in 37 months.
The Chicago Purchasing Managers' Index exploded 13.5 points higher in May to reach 62.7, a four-year high that demolished the consensus estimate of 50.5 and delivered the most decisive single-month swing from contraction to expansion the indicator has produced since the post-pandemic reopening surge of 2021. The prior month's reading was 49.2, which means the Chicago PMI crossed the 50 line that separates contraction from expansion and kept running.
For a market that had largely written off U.S. manufacturing as structurally impaired — hobbled by high rates, a strong dollar, and uneven global demand — this number demands a reassessment.
What Drove the Surge
The Chicago PMI covers the Midwest industrial heartland, surveying purchasing managers at manufacturers, distributors, and logistics companies in the region. A reading in the low 60s signals not just expansion but acceleration: order books are filling, production schedules are stretching out, and hiring is picking up. The 13.5-point monthly gain puts this in the top 1% of all monthly moves in the index's history.
Several forces appear to be converging. The AI infrastructure buildout is generating substantial demand for physical components — servers, power distribution equipment, cooling systems, and the specialized materials that go into data center construction. Reshoring initiatives in semiconductor fabrication, driven by CHIPS Act subsidies, are pulling capital expenditure into domestic manufacturing. And the collapse in oil prices during May lowered input costs for energy-intensive producers, improving margins and potentially unlocking orders that had been deferred during the Hormuz-driven price spike.
What It Means for Today's ISM
The Chicago PMI is historically regarded as a leading indicator for the national ISM Manufacturing PMI, which releases today at 10 a.m. ET. The May ISM reading was 52.7, already the highest in 37 months, and the consensus for today's print sits around 53.0. But the magnitude of the Chicago surprise raises the possibility that the national number could overshoot meaningfully.
A strong ISM reading would confirm that the U.S. manufacturing sector has decisively exited the contraction phase that plagued it through much of 2024 and 2025. For equity traders, that is bullish for industrials, materials, and capital goods stocks. For bond traders, it is a complication — stronger manufacturing activity means stronger growth, which means stickier inflation and less room for the Fed to ease.
The Inflation Wrinkle
There is a tension at the heart of this data point. A manufacturing revival is unambiguously good for the real economy — it means jobs, investment, and output growth. But it arrives at a moment when the Fed is already struggling with inflation running at 3.8% on headline PCE. Stronger manufacturing demand could pressure input prices, extend delivery times, and create the kind of supply-chain tightness that characterized the inflationary surge of 2021-2022.
The ISM report includes sub-indices for prices paid and supplier deliveries that will be closely watched for exactly this reason. If the headline number comes in strong but the prices-paid component is contained, the market can celebrate. If both are elevated, expect the 10-year yield — already at 4.47% — to push higher, and for rate-hike pricing to firm further.
Looking Ahead
Beyond today's ISM, the next manufacturing data point to watch is the June Chicago PMI in late June and the Q2 industrial production figures. If the May surge proves to be more than a one-month anomaly, it could mark the beginning of a genuine manufacturing cycle — something the U.S. economy has not experienced outside of pandemic-distorted periods in over a decade. The question is whether the Fed will allow it to run or whether rate policy will choke it off. Today's ISM number starts to answer that question.
