The State Street SPDR Bloomberg Convertible Securities ETF aims to mirror the price and yield performance of the Bloomberg US Convertible Liquid Bond Index, before accounting for its fees and expenses. This fund provides investors with focused access to the U.S. market for convertible securities, specifically targeting those with an initial offering of at least $350 million and a minimum of $250 million still outstanding. Convertible bonds are unique debt instruments that offer holders the option to exchange them for a set number of the issuing company's common or preferred shares. The ETF's portfolio is rebalanced monthly, on the last business day.