Exchange-Traded Funds (ETF) Definition
A type of an investment company (either an open-end company or UIT) whose objective is to achieve the same return as a particular market index. ETFs differ from traditional open-end companies and UITs, because, pursuant to SEC exemptive orders, shares issued by ETFs trade on a secondary market and are only redeemable from the fund itself in very large blocks (blocks of 50,000 shares for example).