Which U.S. company’s 2010 trading error helped trigger the Flash Crash?

Waddell & Reed’s trading activity helped trigger the 2010 Flash Crash.

On May 6, 2010, U.S. equity markets experienced an extraordinarily rapid collapse and partial recovery. The Dow Jones Industrial Average fell about 1,000 points, nearly 9%, within minutes before recovering much of the loss. A large automated sell order in E-mini S&P 500 futures was placed by Waddell & Reed Financial, and regulators concluded that its execution interacted with existing market stress and high-frequency trading.

The event exposed how modern electronic markets could amplify a relatively short-lived imbalance. Some individual securities briefly traded at bizarre prices, although the deepest dislocations were reversed quickly. Investigations emphasized the interaction of automated systems rather than a single traditional banking failure.

Knight Capital Group is often confused with Waddell & Reed because Knight caused a separate 2012 trading disruption after faulty software was deployed. The Flash Crash also led to stronger circuit breakers and improved monitoring of algorithmic trading across U.S. markets.