Definitions for "Maintenance margin"
The minimum margin which an investor must keep in a margin account all the time in respect to each open contract.
In addition to the initial margin or performance bond posted in futures, options, and securities markets, each of these markets requires participants to post additional margin if the initial margin is not adequate to ensure that participants will meet their obligations. There is usually no maintenance margin requirement on long option positions because they must be fully paid for in most markets.
A maintenance margin will be required if your margin account falls below the required amount due to your investment losses. When this occurs, a margin call is issued , and you are required to deposit additional funds to bring the account back to the amount of the initial margin. Depending on your brokerage firm, you may be asked to deposit the funds, via wire transfer or certified/cashier's check, either same day or by the next day.
Keywords:  bond, performance, see
See maintenance performance bond.