Which 1720 company became the namesake of Britain's famous stock-market bubble and crash?

The South Sea Company became the namesake of Britain's famous stock-market bubble and crash in 1720.

Founded in 1711, the company received a government-backed monopoly over British trade with Spanish South America in exchange for taking on government debt. In practice, its commercial opportunities were far more limited than many investors imagined. Promotional claims and expectations of enormous profits drove its share price sharply higher in 1720.

The company became entangled with a broader speculative boom. Investors bought shares using borrowed money, while other ventures issued shares to exploit the public appetite for speculation. When confidence weakened, prices collapsed and many investors suffered severe losses.

The South Sea Bubble is often presented as a simple story of irrational crowds, but government debt, political influence, credit, and limited information all contributed. Parliament responded with the Bubble Act of 1720, which restricted companies that operated without a legal charter. The crash damaged public trust and remains one of history's best-known examples of a speculative stock-market bubble.