What was the fastest U.S. bear market on record, reaching a 20% decline in just 16 trading days in 2020?

The COVID-19 bear market was the fastest U.S. bear market on record, reaching a 20 percent decline in just 16 trading days in 2020.

The S&P 500 entered bear-market territory on March 12, 2020, after the coronavirus outbreak led to travel restrictions, business closures, supply disruptions, and extraordinary uncertainty. The decline from the February 19 record high to the March 23 low took only 33 calendar days.

The Federal Reserve cut interest rates, restarted large-scale asset purchases, and introduced emergency lending programs. Congress also passed major fiscal-support legislation. These measures, along with improving expectations about vaccines and reopening, helped produce a powerful rebound from the March low.

The 2020 crash differed from the 2008 crisis because its initial shock came from a public-health emergency rather than a collapsing financial system. The market’s speed was unusual even though later volatility remained high.