The Flash Crash: When the Market Fell 9% and Recovered in Minutes
The Dow Jones plunged around 9% in minutes — including a period where some stocks traded for pennies — before largely recovering the same afternoon, exposing how thin liquidity had become in electronic, algorithm-driven markets.
- Intraday decline
- ~9% in about 36 minutes
- Recovery
- Most of the loss reversed the same day
- Some stocks briefly traded at
- As low as $0.01
What happened
On the afternoon of May 6, 2010, US markets already under pressure from European debt concerns began falling sharply and rapidly. Within about 36 minutes, the Dow Jones Industrial Average dropped roughly 9%, erasing close to a trillion dollars in market value, before recovering the majority of the loss within the same session.
During the worst of the plunge, the automated liquidity that normally keeps markets functioning evaporated. Some large, well-known stocks briefly traded for a single cent, while others spiked to absurdly high prices, as market makers' systems paused or withdrew rather than trade into conditions their models could not make sense of.
Investigation later pointed to a combination of factors, including a very large automated sell order in futures contracts interacting with high-frequency trading algorithms in a feedback loop, compounded by that sudden withdrawal of liquidity across many stocks at once.
Why it still matters
The Flash Crash is the sharpest illustration available of how thin liquidity can become in seconds, even in the most heavily traded markets in the world. A stop order resting during that window would have filled at a price with no relationship to the stock's value moments earlier.
It is also why exchanges introduced more granular, stock-by-stock circuit breakers afterward, rather than relying solely on market-wide ones — a mechanism that pauses trading in an individual stock when it moves too far, too fast, giving liquidity time to return before more orders execute into a vacuum.