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Amid a shifting monetary landscape, the U.S. middle market is demonstrating significant resilience, signaling a potential decoupling from broader small-business stagnation. According to reports from RSM US, the Middle Market Business Index (MMBI) surged to 113.4 in the second quarter of 2026, up from 107 in the prior quarter. This jump marks a new business cycle high, driven by sustained capital investment and heightened optimism among firm executives.
This robust performance stands in contrast to intensifying inflationary pressures captured in recent market data. Per market data, the U.S. annual CPI reached 4.2% in May 2026, up from 3.8% in the previous period. Furthermore, the Producer Price Index (PPI) showed a 1.1% monthly increase as of June 11, 2026, suggesting that while middle-market firms remain bullish, they are navigating an environment of rising input costs that has weighed more heavily on smaller competitors.
Looking ahead, market participants should monitor whether this optimism can withstand higher global borrowing costs following the ECB's rate hike to 2.4% on June 11, 2026. Key catalysts to watch include upcoming U.S. labor market updates; recent data showed initial jobless claims at 229,000, and further softening in employment could eventually test the investment appetite of the middle-market sector.
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