What is insider trading?

Insider trading is when someone who has non-public, inside information about a specific stock trades in that company's shares.

How does insider trading work? Learn more
Commonly asked questions See FAQs

No-one likes a cheater, and least of all, one that gets rich using an unfair advantage. That’s why insider trading rules exist. They stop privileged bosses and professionals making money unfairly on the stock market by using their secret knowledge. Learn what insider trading is, why it’s so bad and what the rules mean for you.

What is insider trading?

Insider trading is when someone in a privileged position, like an employee, uses secret information to help them make money on the stock market. They might know privileged financial information about a company that’s not publicly known and will affect the share price of the stock in the future. If they act on this information they could profit big time as they effectively have a crystal ball and can predict share price movements.

The problem is that making money from privileged insider information is illegal. Stock market trading needs to be a level playing field for investors, otherwise insiders can rip off other investors. They can buy or sell shares, knowing they are worth a different amount to what they have paid.

How does insider trading work?

Insider trading occurs when investors find out secret information that’s not known to the public. They then use this information to profit from buying and selling shares. They can make money because they know in advance which way the share price will move.

Trading as an insider includes tipping off others with information, like friends and family members. If a friend receives a tip-off from an employee and uses this information to profit on the stock market, they are both acting illegally and could be prosecuted.

What are the insider trading rules in the UK?

The UK insider trading rules are set out in the Criminal Justice Act 1993. According to the rules, an individual is committing a criminal offence if:

  • They use inside information in relation to shares
  • They buy or sell related to the inside information
  • The dealing takes place on a regulated market or through a broker

An insider may be able to defend themselves if the following applies:

  • They weren’t expecting to make a profit
  • They thought the information was widely known
  • They would have traded the shares even without knowing the private information

Is insider trading illegal?

Yes. Insider trading is a criminal offence in the UK. It’s illegal if the insiders made investing decisions based on information that isn’t public yet and would affect the share price.

For example, suppose someone works for a company and knows secret information that will affect the stock price in the future. They share it with a family member and then that family member acts on the information and buys or sells shares. In this example, both people are guilty of breaking the law.

Why is insider trading illegal?

Insider trading has been illegal in the UK since 1980 and is actually classed as a type of fraud. It’s illegal because it gives insiders an unfair advantage over other investors. They can use information to make money unfairly because they know secret information that will cause the share price to change once the information becomes public. It’s as if they had a crystal ball to predict future share prices.

What happens if you start insider trading?

If you start insider trading then you are breaking the law. If you get caught, you could get hit with a heavy fine or even a prison sentence.

If you’re a professional like a lawyer or an accountant, you could lose your professional qualification if you’re caught breaking the law.

What is an example of insider trading?

An example of insider trading is the case of American businesswoman and “domestic goddess” Martha Stewart. Her squeaky clean image came unstuck when she was prosecuted for insider trading.

She invested in pharmaceutical company ImClone and in 2001 received a tip-off that would affect the share price. Her stock broker, Peter Bacanovic, passed on information received illegally from CEO Samuel D. Waksal that the FDA wouldn’t approve a new cancer drug for pharmaceutical company ImClone. The share price for the company had been riding high because most experts expected the drug to be approved.

As a result, Martha Stewart sold around 4,000 shares and made nearly US$250,000 on the sale. The share price was riding high because most experts expected the FDA to approve the new cancer drug.

When ImClone announced the news, the share price of ImClone plunged from approximately US$60 to just over US$10 in the following months.

The American financial regulator, the SEC, discovered that insider trading had taken place and prosecuted Martha Stewart, Peter Bacanovic and Samuel D. Waksal. Waksal was sentenced to 7 years in prison and fined US$4.3 million, and a year later Stewart and Bacanovic were also found guilty. Stewart was sentenced to a minimum of 5 months in prison and fined US$30,000.

Can anyone insider trade?

Insider trading is usually associated with people who work for listed companies and get access to privileged information. They can use this information to make money on the stock market. But it is also possible for ordinary members of the public to break the law if they find out private information that would affect a share price.

Finding out secret information and using it to make a profit on the stock market is breaking the law, regardless of how you found out the information.

Can a CEO buy stocks in the company they work for?

Yes, a CEO can buy stocks in the company they work for. Not only that, but companies often offer share options to employees who work for them.

It’s not usually insider trading if a CEO or an employee buys or sells shares in the company they work for. If directors of the company purchase or sell shares and disclose their transactions legally then it’s not illegal as they are complying with the rules.

Why is insider trading so serious?

Zoe Stabler

Finder expert Zoe Stabler answers

Insider trading gives the financial services industry a bad name. It’s when corrupt individuals aim to make money based on their special, privileged knowledge. Like any corruption, a few rotten individuals can spoil things for the rest of us. They can make money at the expense of other investors by cheating the system.

That’s why it’s important the financial regulators take a tough stance on insider trading and impose harsh penalties on investors who are found guilty.

Bottom line

Insider trading rules protect other investors and make sure that people can’t benefit unfairly from their privileged position. They mean it’s illegal to use secret information about a company to make money from buying or selling its shares. People who break the rules could face a hefty fine or even a prison sentence and professionals could be barred from practising again.

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