It also refers to the amount of equity contributed by an investor as a percentage of the current market value of securities held in a margin account. (investopedia.com)
Equity is the combination of cash and market value of securities in the account in excess of debit balances. (usaa.com)
The amount available for a margin loan is based on the current market value of the securities held in your account or the securities you are purchasing. (td.com)