What nickname was given to the worldwide stock-market plunge on March 9, 2020?

The worldwide stock-market plunge on March 9, 2020, was nicknamed Black Monday.

Markets fell as investors reacted to the rapidly spreading COVID-19 pandemic and a collapse in negotiations between major oil producers. The oil shock followed a dispute between Saudi Arabia and Russia, which led to expectations of sharply lower crude prices and severe stress for energy companies.

The S&P 500 fell 7.6% on March 9, triggering a 15-minute trading halt under the exchange’s circuit-breaker rules. Major European and Asian indexes also declined, making the session a global market event rather than an isolated U.S. sell-off.

The term Black Monday had already been used for the 1987 crash, so the 2020 label is usually written as Black Monday (2020). Markets suffered another major decline on March 16, 2020, when the S&P 500 fell about 12%, but that session is a separate date within the pandemic crash.