(ˈ)inˈsīdə(r), ən- noun
( -s )
Etymology: inside (I) + -er
: a person recognized or accepted as a member of some group, category, or organization: as
a. : a person having access to confidential information because of his position
b. : an officer or a director of a company or a beneficial owner of 10 percent or more of an equity security registered on an exchange
laws regulating the manipulation of a company's securities by insiders