The South Sea Company stood at the center of the South Sea Bubble, one of the 18th century’s major financial crashes.
Founded in 1711, the company received a British government monopoly over trade with parts of Spanish South America in exchange for taking on government debt. Investors expected enormous commercial profits, although the company’s actual trading opportunities were far more limited than its promotional image suggested.
Its shares soared in 1720 as speculation spread through London. The company encouraged confidence with ambitious plans and rising prices, while imitators created a wider bubble in shares and joint-stock ventures. When confidence broke, prices collapsed and many investors suffered severe losses.
The South Sea Bubble is often mentioned alongside France’s Mississippi Bubble, which collapsed in the same year. The episode helped inspire parliamentary investigations and remains a classic example of speculative excess, misleading promotion, and financial contagion.