insider
noun [ C ]
uk/ɪnˈsaɪdər/ us WORKPLACE
someone who is part of a group, or who works for a company or an organization and therefore has special knowledge or influence:
She has an insider's view of the often brutal nature of trading in the stock market.
an industry insider
WORKPLACE, FINANCE
someone who is in a high position in a company, or someone who owns ten or more percent of shares in a company:
a company insider
This form needs to be filled out by any newly appointed corporate insider.