Illegal insider trading is trading a security while aware of material, non-public information obtained in breach of a duty of trust or confidence, or passing that information to someone who trades. Legal "insider trading" also exists, when company insiders buy or sell their own company's stock and report it publicly. Retail traders usually get caught by trading on tips from friends, family or co-workers. In the US, penalties include disgorgement, fines of up to three times the profit, and criminal prison sentences.
Most traders assume insider trading is something only executives do. In practice, a lot of enforcement cases involve ordinary people: a friend of an employee, a relative, a contractor who overheard something. This isn't legal advice, but here's how the rules work, in plain English.
Legal vs illegal insider trading
Legal: company officers, directors and large shareholders buy and sell their own company's stock all the time. They must report trades to the SEC, usually on Form 4 within two business days, and they often trade under pre-scheduled Rule 10b5-1 plans. This public insider activity is information traders can use legally.
Illegal: trading while aware of material, non-public information (MNPI) in breach of a duty, or tipping someone else who trades.
The three elements
| Element | What it means | Examples |
|---|---|---|
| Material | A reasonable investor would consider it important | Earnings before release, a pending acquisition, FDA decisions, a major contract, a cyber breach |
| Non-public | Not yet broadly released | Information from inside a company, a law firm, a bank or an auditor |
| Breach of duty | Obtained through a relationship of trust, or misappropriated | An employee, a consultant, a family member told in confidence, a lawyer on the deal |
Under the misappropriation theory, you don't need to work for the company. Trading on confidential information taken from your employer, a client or a family member can be illegal.
Score the Setup Before You Take It
TRADZY's Void Engine rates any setup 0–100 across 12+ variables: structure, trend alignment, volume, momentum and key levels.
Score a Setup Free →How retail traders get into trouble
- Tips from friends or family. "My cousin says their company is being bought, so load up." If the cousin breached a duty and you knew or should have known, both of you can be liable. Tippees who trade on information they know came from an insider breach are a core enforcement target.
- Work information about other companies. Knowing a client or supplier is about to announce news.
- Overheard conversations. Trading on information you know was confidential and improperly disclosed is risky.
- Group chats and Discords passing on "insider" information.
- Options on tips. Short-dated, out-of-the-money calls bought just before a deal announcement are one of the patterns regulators look for most.
How it gets detected
Regulators and exchanges run surveillance that flags unusual trading before major announcements, especially options activity. FINRA and the SEC then trace accounts, relationships, phone records and messages. Many cases start from trading that looked "too perfect", or from a tip that passed through several people.
Penalties in the US
- Civil (SEC): disgorgement of profits (or losses avoided) plus penalties of up to three times that amount, and bars from serving as an officer or director.
- Criminal (DOJ): fines and prison. Securities fraud carries a maximum of 20 years for individuals.
- Brokerage consequences: account closures, and permanent professional bans for industry employees.
Other countries have equivalent regimes: the UK (Market Abuse Regulation, and criminal insider dealing under the Criminal Justice Act 1993, enforced by the FCA) and the EU (Market Abuse Regulation). The principles are very similar.
Prediction markets and crypto
Insider trading is a live issue in newer markets too:
- Prediction markets. In March 2026, Kalshi and Polymarket introduced measures to curb insider trading, and the CFTC has warned about manipulation risks. Trading an event contract on confidential knowledge of the outcome can break exchange rules and the law. See What Are Prediction Markets?
- Crypto. US authorities have brought insider trading cases involving token listings. Confidential knowledge of an upcoming exchange listing can be MNPI.
Staying on the right side of the line
- If it came from inside a company and isn't public, don't trade on it and don't pass it on.
- Be careful with tips that sound specific and time-bound ("announcement next week").
- Know your employer's policy. Many firms have blackout periods and pre-clearance rules, including for spouses.
- Use public insider data legally. Form 4 filings, 13D/G filings and public disclosures are fair game.
- When in doubt, don't trade, or get legal advice first.
Using legal insider data in your analysis
Clusters of open-market purchases by several insiders are often considered a more meaningful signal than sales, since executives sell for many reasons (taxes, diversification, planned sales). Treat insider buying as one piece of context, not a trade trigger. Combine it with price structure and your own setup rules.
TRADZY's TradLog lets you record why you took every trade. If "a friend told me" ever appears as a reason, that's worth a second look.
FAQ
Is it illegal to trade on a tip from a friend?
It can be. If your friend breached a duty by sharing material, non-public information, and you knew or should have known that, trading on it can be illegal insider trading for both of you.
Can company employees buy their own company's stock?
Yes, legally, if they don't trade on material non-public information and they follow company policies, such as blackout periods and pre-clearance. Officers and directors must also report trades publicly.
How does the SEC catch insider trading?
Through market surveillance that flags unusual trading before announcements, especially in options, followed by investigations into the traders' relationships and communications.
What is the penalty for insider trading?
In the US, civil penalties of up to three times the profit gained or loss avoided, plus disgorgement. Criminal penalties can include large fines and up to 20 years in prison.
Is insider trading illegal in crypto and prediction markets?
Regulators have brought cases involving crypto token listings, and prediction market exchanges prohibit trading on confidential knowledge of outcomes. The rules are still developing, so treat confidential information as off-limits.
Put This Into Practice
- Score your next setup 0–100 with the Void Engine before entering
- Log the trade and tag the setup in the TradLog
- Review weekly: keep what pays, cut what doesn't
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Educational content, not financial advice. Trading involves substantial risk of loss.