The 2010 market event was the Flash Crash.
On May 6, 2010, major U.S. equity indexes plunged rapidly and then recovered much of the loss within minutes. The Dow Jones Industrial Average briefly lost nearly 1,000 points, while some individual securities displayed extraordinarily low or high prices.
Investigations found that high-frequency trading and automated order systems interacted with existing market stress and a large sell order. The U.S. Securities and Exchange Commission and the Commodity Futures Trading Commission later described a chain of events involving liquidity withdrawal and aggressive automated trading.
The Flash Crash differed from a conventional bear market because its most dramatic movement happened in a very short period. Regulators introduced measures such as single-stock circuit breakers and market-wide trading pauses to reduce the risk of similar disorderly moves.