Dictionary : 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".
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