Inflation Just Hit a 3-Year High. The Last Time the CPI Spiked Like This, Stocks Did Something Most Investors Forgot

"The cleanest analog is the post-COVID inflation surge that ran from 2021 into 2022. Inflation built steadily that year, the Fed dismissed it as transitory, and then the math caught up with the rhetoric. Stocks did something most investors have already memory-holed. Across 2021 and 2022 together, the S&P 500 ETF went from $368.79 on January 4, 2021 to $382.43 on December 30, 2022. That is a total return of 3.7% over two full years. A grinding, frustrating round trip that punished anyone who chased the 2021 highs and shook out anyone who panicked at the 2022 lows."

"What's particularly notable is the breadth of the move. The current reading sits in the 90.9th percentile of the past 12 months, and the Fed's preferred gauge is moving the same direction. Core PCE hit 129.28 in March, also a fresh 12-month high in the 90.9th percentile of its own range. I've been watching the monthly CPI series for the better part of two decades, and the last time it landed this hot, the playbook that followed surprised almost everyone."

"Although Wall Street has spent the spring of 2026 in melt-up mode, with the S&P 500 up 26% over the past year and tacking on another 8.6% in just the last month, this morning's inflation report rattled the easy narrative. The Bureau of Labor Statistics' headline CPI index pushed to 332.4 as of April, a 0.6% monthly jump that lifts the gauge to its highest level in roughly three years. Inflation, the story we were told was buried, just clawed its way back into the headlines."

"Extend the window to the period most economists tag as the actual inflation-shock cycle, October 2021 through September 2023, and the picture sharpens. SPY went from $434.24 to $427.48, a return of negative 1.56% over nearly two years. The index essentially treaded water through the worst inflation episode in a generation, even as nominal earnings grew and the headline economy chugged along."

Headline CPI rose 0.6% in April to 332.4, the highest level in about three years, and pushed the measure into the 90.9th percentile over the past 12 months. Core PCE rose to 129.28 in March, also reaching a 12-month high and the 90.9th percentile of its range. The breadth of the move suggests inflation is reappearing as a dominant market factor. A historical comparison points to the 2021–2022 post-COVID inflation surge, when the Fed initially treated inflation as transitory and stocks delivered a grinding, low-return period. Extending the comparison to the inflation-shock cycle from October 2021 to September 2023 shows the S&P 500 ETF roughly treading water despite earnings growth.

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