What date is associated with the 2010 Flash Crash in US stock markets?

The 2010 Flash Crash occurred on May 6, 2010, in US stock markets.

During the afternoon, major US indexes plunged rapidly before recovering much of the loss. The Dow Jones Industrial Average briefly fell by nearly 1,000 points, while many individual securities recorded extraordinarily low or high transactions.

A joint investigation by the US Securities and Exchange Commission and the Commodity Futures Trading Commission concluded that a large automated sell order in E-mini S&P 500 futures helped trigger the episode. High-frequency trading and liquidity withdrawal then amplified the movement.

The event exposed the vulnerability of electronically connected markets to feedback loops and disappearing liquidity. Regulators subsequently introduced measures including single-stock circuit breakers, trading pauses, and the Limit Up-Limit Down system.