A demand made of a customer of a stock brokerage or futures commission merchant firm to add more money into his or her account. Margin calls are made in order to bring investors’ accounts up to a minimum level. This happens when the price of a stock, futures contract, or other security declines after it has been purchased on margin. In the futures market, a clearinghouse also may make a call asking the member to increase the amount of money on deposit.
2005: If we do issue a margin call, we may give you a limited time to satisfy the call. "” TIAA-CREF Brokerage Services.