The 2010 event in which the Dow Jones Industrial Average fell nearly 1,000 points intraday was the Flash Crash.
On May 6, 2010, U.S. stock markets experienced an exceptionally rapid decline and partial rebound. The Dow Jones Industrial Average fell about 1,000 points, roughly 9 percent, within minutes before recovering much of the loss. Prices in some individual securities moved to extreme levels during the disruption.
Investigations found that automated trading and unusual market conditions played important roles. The U.S. Securities and Exchange Commission and the Commodity Futures Trading Commission concluded that a large sell order in E-mini S&P 500 futures interacted with high-frequency trading and reduced market liquidity.
The event showed how electronic markets could accelerate price movements. It also prompted safeguards such as circuit breakers and later reforms aimed at improving coordination between futures and equity markets. The Flash Crash was a rapid intraday disruption, not a prolonged bear market like the 2008 collapse.