In 1720, the South Sea Company rose to become one of the most valuable firms in the UK before a spectacular collapse of its shares triggered the first major stock market crisis previewed by speculation and financial engineering.

Central to the drama was John Blunt, a shoemaker’s son who climbed the ranks and became a chief architect of the scheme that inflated the company’s valuation. Blunt’s involvement illustrates how individuals outside traditional finance could orchestrate large‑scale market movements.

The episode examines how speculative fervor and gewonnen financial tricks created the bubble, inspired copycat schemes, and how the crash forced regulators to rethink market oversight. The episode highlights the rapid rise and fall of a once‑glamorous venture and its ripple effects.

The fallout reshaped modern finance by tightening disclosure rules and curbing excessive leverage. The lessons continue to guide today’s high‑yield markets and the regulation of emerging asset classes, underscoring the enduring need for robust oversight.