A corporate insider is an individual who is an officer or employee of a publicly traded company who is aware of significant information which has yet to be released to the public that can influence the company’s stock price. Illegal insider trading is when a person has the privileged knowledge and uses it in an attempt to make a profit for themselves or others.
“Insiders” tend to be corporate executives, officers, directors, or major shareholders, though they may also include employees with access to non-public information.
One of the most notable cases of insider trading involved Martha Stewart. She sold 4,000 of her shares of a stock that her broker said was going to plummet. The day before the news broke, Stewart sold her shares and saved $45,000. Although she was cleared of the charges, she was eventually charged with four counts of obstruction of justice and lying to investigators. She was sentenced to five months of prison, five months of house arrest, and two years of probation.