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What happens after the S&P 500 falls 10% in a month?

It has happened 65 times since 1928. A year after it began, the S&P 500 was up 38 of 65 times, with a median move of +7.1%. On an ordinary day in the same years the median was +9.4%, up 69% of the time.

S&P 500 down more than 10% over 30 days. Not true on 2026-09-25.

What came next

Median move after each episode began, how often it rose, and how many episodes had data. "Normal" is the same move from any trading day in the same years.

Every time it happened

• 2025-04-04 · true for 3 trading days · S&P 500 a year later: +29.7%
• 2022-09-23 · true for 5 trading days · S&P 500 a year later: +17.0%
• 2022-04-29 · true for 9 trading days · S&P 500 a year later: +0.9%
• 2020-03-06 · true for 23 trading days · S&P 500 a year later: +29.3%
• 2018-12-24 · true for 2 trading days · S&P 500 a year later: +37.1%
• 2015-08-25 · true for 1 trading day · S&P 500 a year later: +16.5%
• 2011-08-04 · true for 13 trading days · S&P 500 a year later: +15.9%
• 2010-05-20 · true for 4 trading days · S&P 500 a year later: +24.4%
• 2009-02-02 · true for 14 trading days · S&P 500 a year later: +33.7%
• 2008-09-29 · true for 31 trading days · S&P 500 a year later: -4.1%
• 2008-07-15 · true for 1 trading day · S&P 500 a year later: -23.2%
• 2008-01-22 · true for 3 trading days · S&P 500 a year later: -35.9%
• 2003-02-11 · true for 3 trading days · S&P 500 a year later: +39.6%
• 2002-09-19 · true for 11 trading days · S&P 500 a year later: +22.9%
• 2002-06-26 · true for 15 trading days · S&P 500 a year later: +1.3%
• 2001-09-17 · true for 9 trading days · S&P 500 a year later: -15.9%
• 2001-03-12 · true for 11 trading days · S&P 500 a year later: -1.2%
• 2000-10-12 · true for 1 trading day · S&P 500 a year later: -17.9%
• 1998-08-31 · true for 3 trading days · S&P 500 a year later: +37.9%
• 1990-08-21 · true for 5 trading days · S&P 500 a year later: +21.4%
• 1987-10-16 · true for 25 trading days · S&P 500 a year later: -2.5%
• 1981-09-08 · true for 4 trading days · S&P 500 a year later: +3.6%
• 1980-03-13 · true for 12 trading days · S&P 500 a year later: +26.0%
• 1978-11-10 · true for 3 trading days · S&P 500 a year later: +7.1%
• 1975-08-14 · true for 1 trading day · S&P 500 a year later: +21.8%
• 1974-12-05 · true for 4 trading days · S&P 500 a year later: +31.3%
• 1974-08-19 · true for 24 trading days · S&P 500 a year later: +13.9%
• 1974-07-08 · true for 4 trading days · S&P 500 a year later: +15.2%
• 1973-11-20 · true for 13 trading days · S&P 500 a year later: -31.2%
• 1970-04-28 · true for 18 trading days · S&P 500 a year later: +30.5%
• 1966-08-29 · true for 1 trading day · S&P 500 a year later: +24.6%
• 1962-05-23 · true for 21 trading days · S&P 500 a year later: +14.7%
• 1957-10-21 · true for 2 trading days · S&P 500 a year later: +31.0%
• 1950-07-11 · true for 6 trading days · S&P 500 a year later: +25.2%
• 1948-11-24 · true for 6 trading days · S&P 500 a year later: +8.6%
• 1946-09-03 · true for 19 trading days · S&P 500 a year later: +2.2%
• 1941-12-22 · true for 3 trading days · S&P 500 a year later: +15.1%
• 1941-02-14 · true for 1 trading day · S&P 500 a year later: -9.5%
• 1940-05-14 · true for 25 trading days · S&P 500 a year later: -7.7%
• 1939-08-23 · true for 1 trading day · S&P 500 a year later: -5.2%
• 1939-03-31 · true for 18 trading days · S&P 500 a year later: +10.9%
• 1938-12-09 · true for 2 trading days · S&P 500 a year later: +0.3%
• 1938-09-26 · true for 2 trading days · S&P 500 a year later: +19.0%
• 1938-03-23 · true for 16 trading days · S&P 500 a year later: +20.9%
• 1938-02-05 · true for 1 trading day · S&P 500 a year later: +16.7%
• 1937-09-07 · true for 60 trading days · S&P 500 a year later: -15.5%
• 1937-04-29 · true for 1 trading day · S&P 500 a year later: -38.8%
• 1935-03-14 · true for 3 trading days · S&P 500 a year later: +76.7%
• 1934-07-26 · true for 9 trading days · S&P 500 a year later: +29.1%
• 1934-05-07 · true for 16 trading days · S&P 500 a year later: -4.4%
• 1934-03-07 · true for 1 trading day · S&P 500 a year later: -19.2%
• 1933-09-26 · true for 16 trading days · S&P 500 a year later: -9.7%
• 1933-08-03 · true for 9 trading days · S&P 500 a year later: -14.1%
• 1933-02-06 · true for 16 trading days · S&P 500 a year later: +82.4%
• 1932-10-05 · true for 19 trading days · S&P 500 a year later: +37.5%
• 1932-03-31 · true for 59 trading days · S&P 500 a year later: -20.0%
• 1932-02-08 · true for 3 trading days · S&P 500 a year later: -14.2%
• 1931-11-23 · true for 31 trading days · S&P 500 a year later: -26.1%
• 1931-09-14 · true for 29 trading days · S&P 500 a year later: -35.5%
• 1931-04-17 · true for 30 trading days · S&P 500 a year later: -59.2%

The 60 most recent of 65.

• 65 separate episodes: a new one starts after 30 days without a match, so one long selloff counts once.
• Try enough situations and one will look like an edge by chance.
• Macro numbers are as published at the time. Stocks include companies that later died.
• How these numbers are made.

More about stock markets

• What happens after the S&P 500 falls 5% in a week?
• What happens after the S&P 500 enters a bear market (down 20% from its high)?
• What happens after the S&P 500 falls 30% from its high?
• What happens after the S&P 500 rises 20% in three months?
• What happens when the S&P 500 hits an all-time high?
• What happens when the S&P 500 is 10% below its 200-day average?
• What happens after the Dow falls 10% in a month?
• What happens after the Dow falls 5% in a week?