The purchase or sale of shares by someone who possesses 'inside' information about the company; i.e. information on the company's performance and prospects which has not yet been made available to the market as a whole, and which, if available, might affect the share price. Exchange Handbook Glossary
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insider dealing or insider trading
This refers to the illegal use of privileged information which, if made public, would significantly affect the share price. For example, if someone knows that a company is about to make an announcement which will affect the price of its shares; it would be an insider dealing if he/she uses that information to buys or sells shares in advance of the announcement to make a profit.
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The purchase or sale of securities by someone who possesses 'inside' information affecting securities which has not yet been made available to the market and which, if made available, would significantly affect the share price. In the UK such deals are a criminal offence. London Stock Exchange Glossary
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(or Insider Trading)
Exploitation of inside or privileged information for profit in market transactions. This is illegal in many countries.
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insider dealing UK US noun [U] UK
► STOCK MARKET, LAW INSIDER TRADING(Cf. ↑insider trading)
Financial and business terms. 2012.