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The 2008 financial crisis: how Lehman's fall shook every market

On 15 September 2008, Lehman Brothers, a 158-year-old Wall Street bank, filed for the biggest bankruptcy in US history. For a few weeks, it looked like the whole financial system might stop working.

Story · 8-minute read · Updated 2026-10-21

The world before the crisis

In the early 2000s, US house prices rose year after year. Many people believed they could only go up.

Banks made it easy to borrow. Some loans went to buyers with weak credit and no proof of income. These were called subprime loans.

Wall Street bundled thousands of home loans together and sold slices of them to investors around the world as "mortgage-backed securities". Many slices were rated as very safe.

Banks also borrowed heavily to hold these products. Lehman Brothers, for example, is widely reported to have had about 30 dollars of assets for every 1 dollar of its own capital in 2007. That's high leverage.

What happened

Around 2006, US house prices stopped rising. Then they started falling.

Borrowers who had counted on rising prices couldn't refinance. Missed payments grew. The "safe" slices of loan bundles turned out not to be safe at all.

Because the banks had borrowed so much, even modest losses on these products ate deep into their capital. And because nobody knew exactly who held the bad loans, banks stopped trusting each other.

The S&P 500 peaked on 9 October 2007 at 1,565.15.

In March 2008, the investment bank Bear Stearns ran short of cash and was sold to JPMorgan in a deal backed by the Federal Reserve. Many hoped that was the worst of it.

The moment everyone remembers

September 2008 was the month the system cracked.

• 7 September: The US government took over mortgage giants Fannie Mae and Freddie Mac.
• 15 September: Lehman Brothers filed for bankruptcy. No buyer or rescue had been found. The Dow fell 504 points, about 4.4%.
• 16 September: The government stepped in to rescue the insurer AIG with an $85 billion loan.
• 29 September: The House of Representatives voted down a $700 billion rescue plan. The Dow fell 777.68 points, about 7%. At the time it was the largest point drop ever.

Four days later, on 3 October, a revised plan passed and was signed into law. It was called TARP.

For weeks, banks hoarded cash. Even safe companies found it hard to borrow for a few days. In December 2008, the Fed cut its main interest rate to near zero.

Stocks kept falling into the new year. On 9 March 2009, the S&P 500 closed at 676.53, about 57% below its 2007 peak.

What changed afterwards

The crisis led to new rules for banks:

• The Dodd-Frank Act (2010) set stricter rules on banks and created the Consumer Financial Protection Bureau.
• Big banks now have to hold more of their own capital and pass yearly "stress tests" run by the Fed.
• Many swaps that once traded privately must now go through central clearing houses.

What it teaches

1. Borrowed money turns small losses into fatal ones

With 30-to-1 leverage, a 3% drop in what you own can wipe out all of your own money. Lehman didn't need house prices to collapse to zero. It needed them to fall a little.

The same math works at any size. Read leverage and margin explained and try real numbers in the margin calculator.

2. In a panic, everything moves together

In late 2008, stocks, oil, most currencies against the dollar and many commodities fell at once. Things that usually move differently started moving the same way. That's correlation rising in a crisis.

3. "Safe" is a label, not a fact

Many of the loan bundles had top safety ratings. That didn't change what was inside them. In trading, your stop and your size are your own safety check. Don't hand that job to anyone else's label. See risk management for beginners.

4. News days get wilder in a crisis

Fed decisions, jobs reports and votes in Congress moved markets hard in 2008. If you trade around big news, read CPI and FOMC days first.

What it doesn't mean

• It doesn't mean banks always fail or markets always crash. 2008 was the worst financial crisis since the 1930s. That's what makes it history.
• It doesn't mean holding through it was easy, or right for everyone. The S&P 500 got back to its 2007 high in 2013. Many people needed their money before then.
• It doesn't mean anyone could have timed it. A few people did see the housing risk early. Many more predicted crashes that never came.
• It's not proof that rescues always work. Economists still argue about what helped and what didn't.

Timeline

Questions