Market Outlook Ahead of July CPI: JPMorgan’s Scenario Analysis

JPMorgan’s trading desk warned that the release of July’s consumer price index (CPI) could trigger pronounced swings in U.S. equities. The firm outlined five possible month-over-month moves for core CPI and paired each with a probability-weighted impact range for the S&P 500. A core CPI increase above 0.3% carries a 5% chance of a 1.5%-2.5% decline in the index, while a reading below 0.15% (5% probability) could lift the S&P 500 by 1%-2%.

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Economists surveyed by Dow Jones expect headline CPI to rise 0.1% in July, putting the 12-month gain at 3.4%. Core CPI—excluding food and energy—is projected to climb 0.2% from June and 2.5% year-over-year. The data are viewed as a key input for the Federal Reserve’s September policy meeting, where the central bank may decide whether to raise rates.

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• Expected headline CPI month-over-month: +0.1%

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• Expected 12-month headline CPI increase: 3.4%

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• Projected core CPI month-over-month: +0.2% (2.5% year-over-year)

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• Fed funds futures (CME FedWatch) price a ?52% probability of a September rate hike.

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The firm’s scenario table quantifies how different core CPI outcomes could translate into S&P 500 moves, reflecting the high stakes investors assign to the inflation reading.

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Because the CPI figures influence expectations for Federal Reserve policy, a higher-than-expected core CPI could reinforce bets on a September rate increase, pressuring equity valuations. Conversely, a softer core reading may bolster hopes for a pause in tightening, supporting stock gains. Market participants are therefore poised to react sharply to the July CPI release, with JPMorgan’s probability-weighted outlook highlighting the range of potential equity market responses.

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