The Barcelona Stock Exchange is a member of Bolsas y Mercados Españoles, an organization designed to streamline Spain's four major securities exchanges (Madrid, Valencia, Barcelona and Bilbao). BAR's official index is the BCN-100 Index, a trade-weighted index consisting of the exchange's 100 most-traded companies. It also has several other indexes, including the BCN PER-30, BCN ROE-30, BCN MID-50 and BCN INDEXCAT.