Famous Insider Trading Cases: 10 Cases That Made History

Insider trading has shaped financial markets, destroyed careers, and led to landmark regulatory reforms. From the leveraged buyout mania of the 1980s to modern-day congressional scandals, these cases reveal how material non-public information can be abused — and how enforcement has evolved to combat it. Here are ten cases that made history.

Ivan Boesky (1986): The Original Wall Street Villain

Ivan Boesky was one of the most successful arbitrageurs of the 1980s, but his returns were fueled by illegal insider tips from investment banker Dennis Levine. Boesky traded on advance knowledge of corporate takeovers, netting hundreds of millions in profits. After being caught, he paid a $100 million penalty and cooperated with prosecutors, famously wearing a wire that led to the downfall of Michael Milken. His case inspired the character Gordon Gekko in the film Wall Street and triggered a new era of aggressive SEC enforcement.

Michael Milken: The Junk Bond King's Fall

Michael Milken revolutionized corporate finance through high-yield bonds at Drexel Burnham Lambert. But his empire collapsed when Boesky's cooperation exposed Milken's role in an insider trading network. Charged with 98 counts of racketeering and fraud, Milken ultimately pleaded guilty to six securities violations, paid $600 million in fines and restitution, and served 22 months in prison. His case led directly to the collapse of Drexel Burnham and reshaped Wall Street's culture around leveraged buyouts.

Martha Stewart & ImClone (2001): A $45,673 Trade That Cost Millions

Martha Stewart sold 3,928 shares of ImClone Systems on December 27, 2001, one day before the FDA rejected ImClone's cancer drug Erbitux. The trade saved her roughly $45,673 — a negligible amount for someone of her wealth. But the cover-up proved far worse than the crime. Stewart was convicted not of insider trading itself, but of conspiracy, obstruction, and making false statements. She served five months in prison and five months of home confinement. Read the full Martha Stewart case breakdown.

Raj Rajaratnam & Galleon Group (2009): The Wiretap Revolution

Raj Rajaratnam ran Galleon Group, a $7 billion hedge fund, while operating an extensive insider trading network that included corporate executives, consultants, and even a Goldman Sachs board member. His case was groundbreaking because the FBI used wiretaps — a tool previously reserved for organized crime — to record conversations about illegal tips. Rajaratnam was convicted on 14 counts, sentenced to 11 years in prison, and ordered to pay over $150 million in penalties. The investigation led to more than 80 related convictions. Learn more in our detailed Galleon Group case study.

SAC Capital & Steven Cohen (2013): The $1.8 Billion Penalty

SAC Capital Advisors, founded by Steven Cohen, was one of the most profitable hedge funds in history — and one of the most aggressive in pursuing informational "edge." Eight SAC employees were convicted of insider trading, including portfolio manager Mathew Martoma, who executed a $276 million trade based on confidential Alzheimer's drug trial data. SAC pleaded guilty to securities fraud and paid a record $1.8 billion penalty. Cohen himself was never criminally charged but faced "failure to supervise" charges and was barred from managing outside money until 2018. The firm rebranded as Point72 Asset Management. See the complete SAC Capital story.

Enron Executives (2001): Selling Before the Collapse

While Enron's accounting fraud was the primary scandal, insider selling by executives compounded the betrayal. Top executives sold more than $1 billion in Enron stock while the company's fraudulent accounting was concealed from the public. CEO Ken Lay sold shares while simultaneously encouraging employees to buy — employees whose retirement savings were devastated when the stock went to zero. The Enron scandal led directly to the Sarbanes-Oxley Act of 2002, which accelerated insider filing deadlines to two business days.

R. Foster Winans: The Wall Street Journal Reporter

R. Foster Winans co-wrote the influential "Heard on the Street" column at The Wall Street Journal in the early 1980s. He leaked advance copies of his columns to a stockbroker, who traded on the information before publication moved stock prices. Though Winans argued he wasn't a traditional corporate insider, the Supreme Court upheld his conviction under the misappropriation theory — he had misappropriated confidential information belonging to his employer. The case established that insider trading law extended well beyond corporate officers and directors.

Albert Wiggin (1929): The Banker Who Shorted His Own Bank

Albert Wiggin, head of Chase National Bank, secretly shorted his own bank's stock during the 1929 crash — profiting $4 million while his shareholders were wiped out. He used family-controlled companies to hide the trades. At the time, what he did was perfectly legal, and he even received a lifetime pension from the bank. The public outrage over Wiggin's actions was a driving force behind the Securities Exchange Act of 1934 and the creation of Section 16 reporting requirements for corporate insiders.

Chris Collins (2018): The Congressman Who Called From the White House

U.S. Representative Chris Collins became the first sitting member of Congress convicted of insider trading in 2019. While attending a picnic at the White House in June 2017, Collins received an email revealing that Innate Immunotherapeutics — an Australian biotech company on whose board he sat — had failed a critical drug trial. He immediately called his son, who sold shares and tipped others before the news went public. Collins was sentenced to 26 months in prison. His case highlighted the gap between congressional insider trading law and actual enforcement.

Common Threads and Lasting Lessons

Across these ten cases, several patterns emerge. Most defendants didn't need the money — the amounts involved were often trivial relative to their wealth. The cover-up frequently proved more damaging than the original trade. And enforcement technology has steadily advanced, from the wiretaps that caught Rajaratnam to the data analytics the SEC now uses to detect unusual insider trading patterns.

For investors, legal insider trading — the kind disclosed through SEC Form 4 filings — remains one of the most valuable publicly available signals. The distinction between legal and illegal insider activity is critical: when executives buy their own company's stock on the open market and report it properly, that transparency can be a powerful indicator of conviction in a company's future.