The 2010 Flash Crash: 36 Minutes of Market Mayhem - QuickFinanceStories

On May 6th, 2010, the stock market did something no one thought possible. It crashed nearly 1,000 points in minutes. Then recovered almost completely.

All before most people finished their lunch. This is the story of the Flash Crash. It started like any other nervous day.

Europe was struggling with a debt crisis. Greece was on the verge of default. Protests in Athens had turned violent.

Markets were jittery but functional. Then, around 2:32 PM Eastern Time, something snapped. A massive sell order hit the futures market.

A mutual fund company in Kansas - Waddell & Reed - had programmed an algorithm to sell $4.1 billion in E-mini S&P 500 futures contracts. The algorithm was set to sell based on volume, not price. It didn't care what price it got.

It just kept selling. High-frequency traders saw the wave coming. Instead of stepping in to provide liquidity - their supposed role - they pulled back.

Instead of stepping in to provide liquidity - their supposed role - they pulled back.

Bid after bid disappeared from the order book. The market fell into a vacuum. In minutes, blue-chip stocks traded at absurd prices.

Procter & Gamble, one of America's most stable companies, dropped 37%. Accenture traded for one penny. One.

Single. Penny. Apple traded at $100,000 per share.

The order book had become meaningless. The Dow Jones plunged nearly 1,000 points. 600 points in five minutes. Traders watched in disbelief.

Some thought it was a technical glitch. Others thought it was a terrorist attack. Some thought the financial system was breaking apart.

Then, just as suddenly, buyers returned. Prices snapped back. By 3:00 PM, it was almost like nothing had happened.

Almost. Over 20,000 trades were later canceled by exchanges. Investors who had stop-loss orders triggered at the bottom were wiped out.

Their sells were executed at crash prices, then the market bounced right back. The Flash Crash exposed an uncomfortable truth: Modern markets are incredibly fast - and incredibly fragile. Liquidity can disappear in seconds.

And the algorithms we trust to keep things stable can also tear everything apart. Regulators added circuit breakers afterward. New rules.

New safeguards. But the warning remains: Speed without depth is just a faster way to fall off a cliff.