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Part of: S&P 500 Concentration

XLI lags SPY 400bp: manufacturing flat in May, CAT risk tracked

XLI lags SPY 400bp: manufacturing flat in May, CAT risk tracked

US manufacturing production stalled in May 2026, its first flat reading after four consecutive months of gains, pressuring XLI. Page covers CAT, DE & BA margin risk, Iran supply-chain timeline, and Fed cut-cycle implications.

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Key facts

  • US manufacturing production flat in May 2026 after four months of gains; first stall of year
  • XLI lags SPY by 400bp month-to-date; supply-chain and demand weakness pressures industrials
  • CAT, DE, BA face margin pressure from Iran war-related input costs and supply disruption
  • Iran ceasefire reduces uncertainty but physical supply-chain normalisation takes weeks
  • Fed holding rates; manufacturing weakness could accelerate cut-cycle expectations if persistent

What's happening

US manufacturing production flatlined in May 2026 after four months of consecutive gains, marking the first stall of the year and signalling that Iran war-related supply-chain disruptions have begun to bite harder than expected. The flat reading suggests that April's momentum was not sustainable; either input shortages (critical materials from the Middle East) or demand softness (inventory destocking ahead of the Iran risk premium reversal) has stalled the industrial cycle. This is the first real test of manufacturing resilience in 2026, and it comes at an awkward moment: just as the Fed is signalling patience on rate cuts and companies are rushing to borrow capital.

The sectoral impact is concentrated in XLI (Industrial Select Sector ETF), which has underperformed SPY by approximately 400 basis points month-to-date, reflecting weakness in names like CAT (Caterpillar, exposed to China infrastructure spending and global supply disruption), DE (John Deere, agriculture and construction), BA (Boeing, aerospace supply constraints), and GE (General Electric, electrical equipment). These names face a double pressure: slowing topline growth as construction and agricultural demand cools, and margin pressure from persistent input costs and supply-chain premiums that Iran war disruptions have created.

The macro backdrop is critical. The Fed has signalled it will hold rates through June and is monitoring inflation closely; if manufacturing weakness persists and feeds into broader employment softness, Fed cut expectations will accelerate, pressuring long-duration equities and lifting cyclicals. However, if manufacturing weakness is purely supply-driven (temporary Iran backlog), then a V-shaped recovery is possible once the Strait of Hormuz reopens and supply chains normalise. Q2 earnings guidance from CAT, DE, and BA will be decisive; if they signal continued weakness and lower capex from end-customers, then manufacturing recession risks rise sharply.

Investors are watching June and Q2 data closely. A June rebound in manufacturing PMI and production would suggest the May stall was an anomaly; persistent weakness would validate recession concerns and pressure equities, particularly XLI and cyclical names. The Iran ceasefire helps marginally by reducing uncertainty, but physical reopening of supply routes will take weeks.

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