# 3ABCDEFGHIJKLMNOPQRSTUVWYZ

Margin Requirement

The percentage of the value of a security used as collateral for a loan to purchase it; the required collateral or equity that must be maintained in a margin account with an exchange. The percentage value, which varies from exchange to exchange, must be maintained at all times; if not the account holder will face a margin call.

See also: Margin, Initial Margin, Variation Margin, Maintenance Margin