Key takeaways
- Soros's Quantum Fund reportedly earned roughly $1 billion
- Britain abandoned its currency commitment on September 16, 1992
- Emergency interest-rate increases failed to defend the pound
On September 16, 1992, Britain's government tried desperately to prevent its currency from collapsing. The Bank of England bought pounds, officials announced emergency interest-rate increases, and financial markets watched the confrontation unfold.
By that evening, Britain had abandoned its exchange-rate commitment. George Soros's Quantum Fund emerged with an estimated $1 billion profit from betting against sterling, creating one of the most famous trades in financial history.
According to the Bank of England's original account, extraordinary market pressure overwhelmed official intervention, forcing Britain to suspend the pound's membership in the European Exchange Rate Mechanism (ERM).
The episode became known as Black Wednesday.
Why George Soros Believed the British Pound Would Collapse
Britain joined the ERM in October 1990, committing to keep sterling within a permitted exchange-rate band against other European currencies.
The arrangement was intended to stabilize exchange rates and reinforce confidence in British monetary policy. However, it also restricted Britain's ability to adjust interest rates independently.
The problem became increasingly severe as the British economy entered recession.
Germany maintained comparatively high interest rates following reunification, attracting investment toward the deutsche mark. Britain needed easier monetary conditions to support its struggling economy but risked weakening sterling if it reduced rates.
Soros and his trading team recognized the contradiction.
Stanley Druckenmiller, who worked with Soros, identified the opportunity to short sterling. Soros encouraged building a substantially larger position.
By September 1992, Quantum Fund's bearish sterling exposure was reportedly around $10 billion.
How the $10 Billion Currency Bet Worked
Shorting a currency means positioning to profit if its exchange rate declines.
Quantum Fund could sell sterling for stronger currencies, including deutsche marks, through currency-market transactions. If sterling subsequently depreciated, buying pounds back would cost less in foreign-currency terms.
The difference could generate a profit, after financing and trading expenses.
Unlike conventional stock short selling, large currency positions could be established through foreign-exchange borrowing and derivatives.
Soros's position was unusually large, but the outcome depended on a broader market imbalance rather than one investor controlling the exchange rate.
The underlying principle was similar to the later housing-market bet by Michael Burry: identify a financial imbalance, establish a position against it and survive until the market adjusts.
Black Wednesday: When the Bank of England Gave Up
On September 16, sterling came under intense selling pressure.
British authorities raised the minimum lending rate from 10% to 12% and announced a further increase to 15% for the following day.
The proposed 15% rate was never implemented.
Even the prospect of substantially higher interest rates failed to halt selling. Later that evening, Britain suspended sterling's participation in the ERM.
The pound subsequently depreciated, rewarding traders who had positioned for that outcome.
Soros's fund reportedly earned approximately $1 billion from its sterling bet. His reputation as the investor who broke the Bank of England followed, although the crisis reflected broader economic pressures and extensive selling by multiple participants.
The episode also involved other prominent investors, including Druckenmiller and future US Treasury Secretary Scott Bessent.
