The Madoff investment scandal was a major case of stock and securities fraud discovered in late 2008. In December of that year, Bernie Madoff, the former Nasdaq chairman and founder of the Wall Street firm Bernard L. Madoff Investment Securities LLC, admitted that the wealth management arm of his business was an elaborate multi-billion-dollar Ponzi scheme.

Bernard Lawrence Madoff was an American financial criminal and financier who was the admitted mastermind of the largest known Ponzi scheme in history, worth an estimated $65 billion. He was at one time chairman of the Nasdaq stock exchange. Madoff's firm had two basic units: a stock brokerage and an asset management business; the Ponzi scheme was centered in the asset management business.