Micron Technology Inc. (NASDAQ:MU) just posted its strongest month in four decades, and history suggests the next one rarely goes as well.

The company’s stock price jumped 87.76% in May, its best monthly gain since November 1985, as an artificial-intelligence infrastructure buildout sent memory pricing and demand vertical. Shares closed the month near $971, up from roughly $512.

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Only one month in Micron’s public-market history was better: November 1985, when the stock soared 97%.

Yet investors celebrating Micron’s historic run may soon face a less friendly seasonal backdrop.