insider(redirected from Market Insider)
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A person who has knowledge of or access to restricted or otherwise nonpublic information about a publicly-traded company. Examples include senior management and shareholders with more than a 10% stake in the company. Under most circumstances, it is a crime for an insider to make trades on the special information he/she possesses. See also: Inside information, Insider trading.
1. A person who, because of his or her position within a firm, has access to proprietary information unavailable to the general public. Although the term obviously includes corporate officers, it also may extend to relatives of these officers or to employees of other firms having a special relationship with the firm in question.
2. Officially, an officer, a director, or the owner of 10% or more of a firm's securities. See also Form 3.