Maintenance Margin
The minimum amount of equity that must be maintained in a margin account. In the context of the NYSE and NASD, after an investor has bought securities on margin, the minimum required level of margin is 25% of the total market value of the securities in the margin account. Keep in mind that this level is a minimum, and many brokerages have higher maintenance requirements of 30-40%.
Also referred to as "minimum maintenance" or "maintenance requirement". Investopedia Says:
As governed by the Federal Reserve's Regulation T, when a trader buys on margin, key levels must be maintained throughout the life of the trade. First off, a broker cannot extend any credit to accounts with less than $2,000 in cash (or securities). Second, the initial margin of 50% is required for a trade to be entered. Finally, the maintenance margin says that an equity level of at least 25% must be maintained. The investor will be hit with a margin call if the value of securities falls below the maintenance margin. Related Terms:
Broker's Call
House Maintenance Requirement
Initial Margin
Leverage
Margin
Margin Account
Margin Call
Minimum Margin
Regulation T - Reg T
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