Equity

(1) The ownership interest of stockholders in a company.  Most typically, common stock.

(2) Equity in a business is the difference in assets and liabilities.

(3) The excess of the market value of securities over debit balances in a margin account. (Refer to credit and debit balance, margin).

(4) As used on a trading account statement, refers to the residual dollar value of a futures or option trading account, assuming it was liquidated at current prices.