The Consumer Price Index (CPI) is the most widely followed measure of inflation. It came in at an annualized rate of 3.8% in April — nearly twice the U.S. Federal Reserve’s target of 2% — as elevated oil prices drive up the cost of every product that travels by truck, boat, and plane.
The Fed was aggressively hiking interest rates last time the CPI was this high in 2023, which was a key reason why the S&P 500 (SNPINDEX: ^GSPC) stock market index plunged into bear territory. Considering the S&P is currently in one of the strongest bull markets investors have ever seen, the CPI has become one of the most important data points on the economic calendar.
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The Bureau of Labor Statistics will release the May CPI report at 8:30 a.m. ET on June 10, and here’s why it could heavily influence the direction of the stock market.
Oil prices remain stubbornly high
The ongoing geopolitical conflict between the U.S. and Iran is causing disruptions in the Strait of Hormuz, a critical waterway through which 25% of the world’s seaborne oil transits each day. Iran is restricting the passage of commercial oil tankers to gain leverage in peace negotiations, so a single barrel of West Texas Intermediate crude is now 62% higher than it was at the start of 2026.
Rising energy prices were the primary reason for the concerning CPI number in April, but there are signs inflation could get even worse. The Producer Price Index (PPI), which measures the change in input costs for businesses, soared to an annualized rate of 6% in the same month, with the energy component alone coming in at an eye-popping 22.7%.
Businesses can be expected to pass at least some of those rising costs on to consumers, which means the May CPI report on June 10 could bring a nasty upside surprise.
The Fed has cut interest rates six times since September 2024, after bringing the last inflation spike from 2022 under control. But according to the CME Group‘s FedWatch tool, which forecasts interest rate moves based on activity in the 30-Day Fed Funds futures market, Wall Street expects at least one interest rate hike before the end of 2026. However, there could be more if the CPI continues to trend higher.
Rising interest rates could upend this bull market
Rising interest rates are a headwind for corporate earnings for a few reasons. First, they force consumers to allocate more of their household budgets to debt repayments, leaving them with less money to spend on goods and services. Second, higher rates increase the cost of debt for businesses, dealing a direct blow to their bottom line. Third, businesses can’t borrow as much money to fuel their growth because higher rates reduce their ability to service larger loans.
