The Kobeissi Letter reports a fresh inflation jolt in the United States after new data showed that May CPI inflation increased to 4.2%, marking the highest level since April 2023. The release also indicated that core CPI inflation rose to 2.9%, the highest reading since September 2025. Together, these figures suggest that price pressures have not eased as much as many market participants may have hoped, and they raise the likelihood that the Federal Reserve will remain cautious about cutting or holding rates lower for an extended period.
In the broader context of US monetary policy, the report emphasizes that inflation is now officially back above the 4% threshold. This matters because the Fed’s policy framework is typically guided by keeping inflation near its target level, and a return above 4% implies that the central bank could face pressure to keep restrictive policy in place until inflation is brought under control. The core inflation measure is particularly important because it strips out more volatile items such as food and energy, and it is often used as a clearer signal of underlying inflation trends. When core inflation climbs to new multi-month highs, it can be interpreted as evidence that elevated prices are becoming more persistent rather than purely driven by temporary shocks.
The Kobeissi Letter frames the May CPI outcome as a meaningful turning point for markets. While earlier periods of disinflation may have encouraged expectations of easing conditions, the latest numbers suggest the inflation trajectory may be flattening or reversing. The report also notes that core CPI’s increase to 2.9% represents the strongest level since September 2025. This detail underscores that the underlying inflation component is also moving higher, not just the headline figure.
As a result, the odds of Fed rate hikes are described as rising. This is a critical market implication because expectations around the path of interest rates influence a wide range of financial decisions—from borrowing costs for consumers and businesses to valuations in equity and bond markets. If investors believe the Fed will need to do more to curb inflation, they may price in higher yields and tighter financial conditions. Conversely, if inflation were consistently falling toward the Fed’s goal, markets might anticipate cuts or a more dovish stance. The reported CPI and core CPI increases therefore shift the balance toward a less favorable disinflation narrative.
The story highlights the mismatch between current inflation levels and the Fed’s intended target. According to the report, inflation is more than double the Fed’s target. This comparison is presented as a justification for why policy expectations could move quickly: when inflation is materially above target, the central bank may be reluctant to loosen its stance even if economic growth slows or if some categories of prices cool.
In practical terms, the data can affect expectations in two main ways. First, it may prompt the Fed to delay any reductions in interest rates because inflation appears stubborn. Second, it may increase the probability of additional tightening actions if policymakers conclude that current settings are not enough to bring inflation down sustainably. The Kobeissi Letter’s language about rising odds of hikes indicates that traders and economists are re-evaluating how restrictive the Fed may need to remain.
Overall, the report paints a clear picture: May CPI inflation rose to 4.2%, the highest since April 2023, and core CPI inflation increased to 2.9%, the highest since September 2025. With headline inflation back above 4% and core inflation also elevated, the market implication is that the Fed may face renewed pressure to prioritize inflation control. The story concludes that expectations for future Fed policy are shifting, with odds of potential rate hikes moving higher in response to the hotter-than-desired inflation readings.
Source: Kobeissi Letter
The Kobeissi Letter: BREAKING: May CPI inflation rises to 4.2%, the highest level since April 2023. Core CPI inflation also rises to 2.9%, the highest since September 2025. Inflation in the US is officially back above 4% and more than double the Fed’s target. Odds of Fed rate hikes are rising.. #breaking
— @KobeissiLetter May 1, 2026
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