margin call Finance Definition
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.

