The fund is an actively managed exchange-traded fund that seeks to achieve its investment objective by investing primarily in equities of U.S. companies that the fund"s adviser, Grantham, Mayo, Van Otterloo & Co. LLC ("GMO" or the "Adviser"), believes to be of high quality. Equity securities primarily include common and preferred stocks and, to a lesser extent, other stock-related securities, such as convertible securities, depositary receipts, equity real estate investment trusts, income trusts, and securities of other investment companies that investment primarily in equity securities.