Why October Could Rattle Stock Markets Again in 2024
October has a storied history of stock volatility. Investors are watching key risks that could trigger another market swoon.
October carries an outsized reputation for stock market turbulence, and seasoned investors are heading into the month alert to the specific pressures that could amplify volatility this year. While the calendar alone does not cause selloffs, the historical clustering of sharp market declines in October has made it a focal point for risk management.
Market participants are closely monitoring a set of known headwinds that have already weighed on equities throughout the year. The source of any potential October disruption would not come as a surprise — investors have been tracking these fault lines for months, suggesting that any downturn would reflect fundamentals rather than sudden shock.
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The so-called "October effect" is partly psychological, rooted in memories of historic crashes in 1929, 1987, and 2008 that all struck during the month. Despite the lore, data show October is not statistically the worst month for stocks on average, yet the perception itself can influence trader behavior and amplify swings when underlying conditions are already fragile.
With major economic data releases, central bank signals, and geopolitical developments all potentially converging in the weeks ahead, investors face a calendar packed with potential catalysts. Portfolio positioning and volatility hedging tend to intensify in October as a result, which can itself contribute to choppy price action.
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