Which 2020 stock-market crash produced the fastest bear-market decline from a record high in U.S. history?

The COVID-19 market crash produced the fastest bear-market decline from a record high in U.S. history.

U.S. stocks entered a bear market in March 2020 as the COVID-19 pandemic spread, governments imposed restrictions, economic activity stopped, and investors feared a deep global recession. The S&P 500 fell more than 30% from its February 19 record high to its March 23 low, doing so in roughly one month.

The Federal Reserve cut interest rates, resumed large-scale asset purchases, and introduced emergency lending programs. Governments also approved major fiscal support. These interventions, together with changing expectations about vaccines and reopening, helped markets rebound rapidly from the March low.

The crash was unusually fast, but the pandemic’s economic effects were not uniform. Travel, hospitality, and many small businesses suffered severe disruption, while technology and remote-work companies often benefited from changed behavior. “Fastest” refers to the speed of the bear-market decline, not necessarily the largest percentage loss in history.