Insider trading is bad because it rigs securities markets against everyone who isn’t in on the secret, raises trading costs for ordinary investors, drains capital away from honest companies, and exposes anyone caught doing it to seized profits, treble-damage penalties, and years in federal prison. Below is what the harm actually looks like, and what the law does about it.
It Breaks the Fairness Markets Depend On
Securities markets function because millions of people are willing to put money at risk on the belief that nobody at the table is playing with a stacked deck. When someone trades on confidential information the public doesn’t have, that belief fractures. The rational response for everyone else is to demand better prices, trade less, or walk away entirely.
The federal framework was built around exactly this concern. The Securities Exchange Act of 1934 was enacted to ensure fair and honest markets through transparency and disclosure, so investors can make informed decisions.1GovInfo. Securities Exchange Act of 1934 SEC Rule 10b-5, the primary weapon regulators use against insider trading, makes it illegal to use any deceptive scheme or make any misleading statement in connection with buying or selling a security.2eCFR. 17 CFR 240.10b-5 – Employment of Manipulative and Deceptive Devices Trading while sitting on material information you had a duty either to disclose or not to use is fraud under that rule.
Information is “material” when a reasonable investor would consider it important in deciding whether to buy or sell. The Supreme Court set that standard in Basic Inc. v. Levinson, holding that a fact is material if there is a substantial likelihood its disclosure would significantly change the total mix of information available to investors.3Legal Information Institute. Basic Incorporated v Levinson Earnings surprises, merger talks, major contract wins or losses, FDA approval decisions — trading ahead of that kind of news is the conduct the law targets.
Ordinary Investors Pay for It in Wider Spreads
The harm isn’t only philosophical. It shows up in the mechanics of pricing. Market makers set the bid-ask spread, the gap between what you can sell a stock for and what you can buy it for, and that spread is essentially a fee baked into every trade.
When market makers suspect they may be trading against someone with inside knowledge, they widen the spread to protect themselves. This is adverse selection: liquidity providers know some percentage of their counterparties may have better information, so they charge everyone more to compensate for the risk of getting picked off. The wider the spread, the more expensive every single trade becomes for pension funds, 401(k) holders, and retail investors alike.
Higher transaction costs feed into a higher cost of capital for companies. When it costs more to buy and sell a stock, investors demand a higher expected return to justify the friction, and companies effectively pay more when they raise money through equity. The result is less corporate investment, slower expansion, and less spending on research and development. Insider trading works as a hidden tax on capital formation, punishing the whole market for the actions of a few.
Companies Take Collateral Damage
When insider trading surfaces at a specific company, the damage runs well past the individual who broke the law. The stock often drops as investors question the integrity of leadership and internal controls. If a senior executive was trading on confidential information, shareholders reasonably wonder what else management might be hiding and what the board was doing about oversight.
Operational costs pile up. Internal investigations consume executive attention. Outside counsel bills mount. The company may face SEC scrutiny of its compliance policies, and controlling persons at the firm face their own exposure if they failed to maintain adequate procedures to prevent the trading.4Office of the Law Revision Counsel. 15 US Code 78u-1 – Civil Penalties for Insider Trading Resources get pulled away from running the business, and the reputational stain lingers long after the headlines fade.
Who The Law Actually Reaches
Courts recognize two theories for prosecuting insider trading, and they reach very different people.
The classical theory covers the straightforward scenario. A corporate officer, director, or employee learns something confidential about their own company and trades on it. Because insiders owe a fiduciary duty to their company’s shareholders, trading on undisclosed material information violates that duty. A CFO buying shares before announcing strong earnings, or a board member selling before a public disclosure of bad news, fits squarely inside this framework.
The misappropriation theory reaches further. In United States v. O’Hagan, the Supreme Court held that a person commits securities fraud when they steal confidential information from someone who entrusted them with it and trade on that information without disclosure.5Legal Information Institute. United States v O’Hagan The trader doesn’t need any relationship with the company whose stock they trade. A lawyer working on a merger for a client, a printer handling tender offer documents, an IT consultant with access to nonpublic financial data — all face liability if they trade on what they learn. The Court compared this to embezzlement: the owner of confidential information has the exclusive right to use it, and a fiduciary who quietly converts it into trading profits has committed fraud.
Tips and the Personal Benefit Test
Liability doesn’t stop with the person who holds the information. If an insider passes a tip to someone else who trades on it, both the tipper and the recipient can be on the hook. The Supreme Court set the framework in Dirks v. SEC: a tippee is liable only if the insider breached a fiduciary duty by sharing the information and received some personal benefit, and the tippee knew or should have known about the breach.6Stanford Law Review. The Genius of the Personal Benefit Test
Courts read “personal benefit” broadly. Cash or a cut of the profits obviously counts. So do reputational advantages, expectations of a returned favor, and gifts of information to family or friends. The Dirks Court treated sharing confidential information with a trading relative or close friend as the equivalent of handing them cash. If a pharma-executive relative mentions upcoming FDA results at dinner, trading on that tip puts both people at risk even if no money changes hands.
Civil Penalties: Giving Back Every Dollar, Plus Three Times More
The SEC’s civil actions can be financially devastating even without any criminal case. The core remedy is disgorgement: the violator surrenders every dollar of profit made or loss avoided through the illegal trading. The Supreme Court confirmed in Liu v. SEC that disgorgement is limited to net profits after legitimate expenses and that the recovered funds should generally be returned to harmed investors.7Supreme Court of the United States. Liu v SEC
Disgorgement isn’t punitive on its own, so Congress added a bigger stick. On top of giving up illegal gains, a violator faces a civil monetary penalty of up to three times the profit gained or loss avoided. Someone who made $500,000 on an illegal tip could owe $500,000 in disgorgement plus $1.5 million in penalties. The same statute reaches supervisors: a controlling person who knew or recklessly ignored that an employee was likely to trade on inside information and failed to prevent it can face penalties up to the greater of $1 million or three times the employee’s illegal profit.4Office of the Law Revision Counsel. 15 US Code 78u-1 – Civil Penalties for Insider Trading
Violators also owe prejudgment interest on disgorged amounts, calculated at the IRS underpayment rate and compounded quarterly, running from the date of the violation until payment.8eCFR. 17 CFR 201.600 – Interest on Sums Disgorged For schemes stretched over years, that interest alone can be substantial. Beyond money, the SEC can ask a court to permanently bar a violator from serving as an officer or director of any public company, effectively ending a career in corporate leadership.9Office of the Law Revision Counsel. 15 USC 78u – Investigations and Actions
Criminal Penalties: Years in Federal Prison
When the evidence supports it, the Department of Justice pursues criminal charges on top of, or instead of, the SEC’s civil case. Under the Securities Exchange Act, a willful violation can result in up to 20 years in prison and a fine of up to $5 million for individuals. For entities such as corporations or hedge funds, the maximum fine is $25 million.10Office of the Law Revision Counsel. 15 US Code 78ff – Penalties
Prosecutors can also charge insider trading as securities fraud under a separate federal statute carrying a maximum of 25 years.11Office of the Law Revision Counsel. 18 US Code 1348 – Securities and Commodities Fraud Recent indictments have stacked both charges, with the securities fraud count carrying the longer sentence and the insider trading count adding exposure on top.12United States Department of Justice. Five Individuals Indicted in Insider Trading Scheme
The combination of civil and criminal exposure is what makes enforcement uniquely punishing. One scheme can produce disgorgement of all profits, a treble civil penalty, years in federal prison, millions in criminal fines, and a permanent bar from corporate leadership.
Short-Swing Profits: A Backstop That Skips the Proof Problem
Even without proof that a trade was based on material nonpublic information, another layer applies. Section 16(b) of the Securities Exchange Act requires corporate officers, directors, and shareholders owning more than 10 percent of a company’s stock to surrender any profit from a purchase and sale (or sale and purchase) of the company’s shares within a six-month window.13Office of the Law Revision Counsel. 15 USC 78p – Directors, Officers, and Principal Stockholders
The rule is blunt on purpose. It doesn’t ask whether the insider actually used confidential information. If the timing fits, the profit belongs to the company. Either the company or any shareholder can sue to recover it. Short-term round-trip trades by insiders are inherently suspicious, and proving what someone knew at the time of a trade is notoriously difficult, so the law simply takes the profit away.
Reporting It Pays
Insider trading is secretive by nature. The people best positioned to see it are usually colleagues, compliance officers, or others close to the wrongdoer. Federal law directs the SEC to pay whistleblowers between 10 and 30 percent of the monetary sanctions collected in enforcement actions where the whistleblower’s original information led to a successful outcome, provided total sanctions exceed $1 million.14Office of the Law Revision Counsel. 15 US Code 78u-6 – Securities Whistleblower Incentives and Protection
The awards can be enormous. Given the SEC’s treble penalty authority and the scale of some schemes, a whistleblower whose tip triggers $10 million in sanctions could receive between $1 million and $3 million. The SEC has paid individual awards exceeding $100 million.15U.S. Securities and Exchange Commission. SEC Issues Largest-Ever Whistleblower Award The information has to be original, meaning derived from the whistleblower’s own knowledge or analysis rather than recycled from news reports or other public sources.14Office of the Law Revision Counsel. 15 US Code 78u-6 – Securities Whistleblower Incentives and Protection