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George Soros and Black Wednesday: the bet against the pound

On September 16, 1992, the Bank of England raised interest rates twice in one day to defend the pound. It didn't work. By evening, Britain had given up, and George Soros became known as "the man who broke the Bank of England."

Story · 7-minute read · Updated 2026-10-21

Who they were

George Soros was born in Budapest, Hungary, in 1930. As a teenager he lived through the Nazi occupation of the city, hiding his Jewish identity with false papers.

After the war he moved to London and studied at the London School of Economics. There he read the philosopher Karl Popper, whose big idea was that people are often wrong and should test their beliefs. That idea shaped how Soros traded.

He moved to New York in 1956 and worked in finance. In 1973 he started his own firm with Jim Rogers. Its main fund became the Quantum Fund.

What happened

The idea: markets can fool themselves

Soros built a theory he called reflexivity. In plain words: what people believe about a market can change the market itself. Prices don't just reflect reality. Sometimes they push it around, until the gap gets too big and snaps back.

He wrote about it in his 1987 book The Alchemy of Finance.

The setup in 1992

In 1990 Britain joined a European system that kept its currency, the pound, inside a narrow band against the German mark. The Bank of England promised to keep it there.

The problem: Britain's economy was weak, and Germany's interest rates were high. To keep the pound in its band, Britain had to keep rates high too, even as its own economy struggled.

Soros and his lead manager, Stanley Druckenmiller, decided the promise couldn't last. Druckenmiller had the idea. By his own telling, Soros pushed him to make the bet much bigger.

The fund built a bet against the pound of about $10 billion.

September 16, 1992

That Wednesday, sellers flooded the market with pounds. The Bank of England bought pounds to hold the price up. It raised its key interest rate from 10% to 12%, then announced a rise to 15%.

None of it stopped the selling. That evening, Britain left the system and let the pound fall. The day became known as Black Wednesday.

Soros's fund was reported to have made about $1 billion on the trade. Sources give slightly different figures, so treat it as approximate.

The moment everyone remembers

The famous part is the size: one fund against a central bank, and the fund won.

The part traders study is the shape of the risk. If the pound stayed in its band, it couldn't rise much, because the band capped it. So if Soros was wrong, the loss would likely be limited. If he was right, the pound could fall a long way.

Small, limited downside. Large possible upside. That lopsided shape, not the size, is what made the bet make sense to them.

A line that Druckenmiller has credited to Soros makes the same point:

What it teaches

1. Know your downside before your upside

Before every trade, ask: if I'm wrong, how much do I lose? That's what a stop loss answers. Then compare it to what you could gain. That comparison is the risk-reward ratio, and the risk-reward calculator does it in seconds.

2. Being wrong is normal; staying wrong is optional

Popper's idea was that you'll often be wrong, so test your beliefs and drop the ones that fail. Soros has said he looks for the flaw in his own view.

For a trader, the stop loss is that test. When price proves you wrong, you're out. No arguing.

3. Central banks and interest rates move currencies

Black Wednesday was a story about interest rates. Rates and promises from a Central bank can push a currency hard, and sometimes the promise breaks. Our guide to how interest rates affect stocks explains the chain in plain words.

4. Big size is for a very rare setup, not a normal day

Soros and Druckenmiller were professionals with huge research teams, betting on something they'd studied for months. Even then, they had big losing years too.

For a beginner, size stays small and fixed, about 1% per trade. See how much to risk per trade.

What it doesn't mean

It doesn't mean one person can beat any market. In 1992, Soros was one of many sellers. The pound's weakness was real; the fund was early and big, not magic.

It doesn't mean big bets are a good idea. Soros's funds also took heavy losses at times, including in the 1987 crash and in 2000, when tech stocks fell.

And you can't copy this trade. Those currency bands no longer exist in the same form, and almost nobody gets that kind of lopsided setup. What carries over is the question: what do I lose if I'm wrong?

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