What event name describes the sudden U.S. market plunge on May 6, 2010?

The sudden United States market plunge on May 6, 2010, is known as the Flash Crash.

During the afternoon of May 6, major U.S. stock indexes dropped rapidly before recovering much of the loss. The Dow Jones Industrial Average fell about 1,000 points, or roughly 9%, in a matter of minutes. Some individual securities briefly traded at extremely low or high prices.

Investigations concluded that high-frequency trading and automated order activity interacted with a large sell order in an already nervous market. The event was not a conventional multi-year bear market like the 1929 crash or the dot-com collapse. It was a brief breakdown in market liquidity and trading coordination.

The Flash Crash led regulators and exchanges to improve circuit breakers, trading controls, and monitoring systems. The event also highlighted how electronic markets can transmit selling at extraordinary speed. Later investigations and prosecutions refined the account of individual responsibility, but the episode remains associated with complex interactions among algorithms, liquidity providers, and human orders.