Which 2010 event saw U.S. stocks briefly lose nearly 1,000 Dow points in minutes?

The 2010 event in which U.S. stocks briefly lost nearly 1,000 Dow points in minutes was the 2010 Flash Crash.

On May 6, 2010, major U.S. equity indexes plunged and then recovered much of the loss in a very short time. The Dow Jones Industrial Average fell about 1,000 points, or nearly 9 percent, before rebounding. Some individual securities temporarily traded at implausible prices.

Regulators concluded that a large automated sell order, combined with stressed market conditions and high-frequency trading strategies, helped produce the extraordinary move. The event exposed weaknesses in market structure, liquidity, and automated safeguards.

The Flash Crash differed from a conventional bear market. It was extremely rapid and partially reversed the same day, rather than unfolding over months or years. Later investigations and prosecutions focused on market manipulation and the use of automated trading systems, but the episode also prompted changes to circuit breakers and trading controls.