Insider Trading Guide — Illegal Securities Trading Explained
Insider trading is buying or selling securities based on material, non-public information. It violates securities laws because it undermines market fairness. Convictions can result in prison sentences, fines, and lifetime bans from the securities industry.
Insider trading is illegal when someone trades a security while in possession of material information that has not been publicly disclosed. Material information is anything a reasonable investor would consider important in making an investment decision — earnings results, merger agreements, FDA drug approvals, or major contract wins. Non-public means the information has not been disseminated through channels like SEC filings, press releases, or major news outlets. The SEC and DOJ prosecute insider trading under Section 10(b) of the Securities Exchange Act of 1934 and Rule 10b-5.
Famous insider trading cases include: Martha Stewart (2004), who sold ImClone stock after receiving non-public information about an FDA rejection. She served 5 months in prison and paid $200,000 in fines. Raj Rajaratnam (2011), hedge fund manager of Galleon Group, convicted of making $63 million profit from insider tips. He received 11 years in prison, the longest sentence for insider trading. Mathew Martoma (2014), a SAC Capital portfolio manager, made $276 million trading on confidential Alzheimer's drug trial results. The case led to SAC Capital paying $1.8 billion in penalties. Steve Cohen, SAC's founder, was barred from managing client money. The SEC also pursues tippees — people who receive and trade on inside information.
How Insider Trading Is Detected
The SEC and FINRA use sophisticated surveillance systems that monitor trading patterns. They flag unusual trading activity before significant corporate announcements — for example, options trading volume spikes before merger announcements. Link analysis connects traders to company insiders through phone records, email, and social connections. The SEC's whistleblower program, which awards 10-30% of sanctions over $1 million, has generated thousands of tips. The Consolidated Audit Trail (CAT) records every order and trade in US equities, enabling regulators to reconstruct trading patterns years later. Increased enforcement includes wiretaps, cooperation agreements, and deferred prosecution agreements.
FAQs
What is a tipper and tippee in insider trading?
A tipper is the person who provides inside information (often a company insider or someone with a duty of confidentiality). A tippee is the person who receives and trades on that information. Both can be prosecuted. Even remote tippees — people who receive information several steps removed from the insider — can be liable if they knew the information was improperly obtained.
What is the difference between legal and illegal insider trading?
Legal insider trading occurs when corporate insiders (executives, directors) buy or sell their company's stock and report the trades to the SEC through Form 4. These trades must occur outside of quarterly blackout periods and not be based on material non-public information. Illegal insider trading involves trading while in possession of material, non-public information, regardless of whether the trader is technically an insider.
Can I be prosecuted for trading on a tip from a friend?
Yes. If a friend shares confidential information about a company (overheard at a dinner party, from their spouse who works at the company) and you trade on it, you can be prosecuted as a tippee. The SEC considers that personal benefit is given when information is shared as a gift. Ignorance of the law is not a defense.