The S&P 500 took 16 trading days to fall from its 2020 record high into a bear market.
The index reached a record closing high on February 19, 2020, shortly before the global spread of COVID-19 caused extraordinary financial uncertainty. By March 12, the S&P 500 had fallen more than 20% from that high, the conventional threshold for a bear market. That interval covered 16 trading days.
The 2020 stock-market crash was unusually rapid. Investors reacted to lockdowns, travel restrictions, disrupted supply chains, falling economic activity and uncertainty about the pandemic’s duration. Oil prices also plunged after a breakdown in negotiations between major oil producers.
Markets later rebounded sharply after central banks cut interest rates, governments introduced emergency support and investors anticipated vaccine development. The 16-day figure refers to the speed of entering the bear market, not the total length or eventual depth of the entire 2020 market episode.