insider trading

noun
the illegal buying and selling of securities by persons acting on privileged information.

Origin:
1965–70

insider trader, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
insider dealing or insider trading
 
n
dealing in company securities on a recognized stock exchange, with a view to making a profit or avoiding a loss, by a person who has confidential information about the securities that, if generally known, would affect their price. Its practice by those connected with a company is illegal
 
insider trading or insider trading
 
n
 
insider dealer or insider trading
 
n
 
insider trader or insider trading
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Cultural Dictionary

insider trading definition


The unlawful practice of using information that comes from a source “inside” the business but is not available to the general public to trade on the stock market. This activity is prohibited by law and is policed by the Securities and Exchange Commission.

Note: In the mid-1980s, several revelations of insider trading rocked Wall Street.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Insider trading is treated essentially as a sophisticated fraud.
Amid the increasing frequency of insider trading phenomena, an alternative
  approach should be considered.
In fact, their actions are technically legal, there's no insider trading.
Corporate executives are promoted through illegal activities such as insider
  trading.
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