The Boston Equity Exchange (BEX) was regional electronic stock exhange formed in 2005 as a joint venture between the Boston Stock Exchange and CitiGroup, CSFB, Fidelity Brokerage Company, and Lehman Brothers.
Additional meaning of Boston Equity Exchange:
The BEX officially opened it's high-speed, fully automated exchange in December of 2006, but was closed less than a year later on September 5, 2007. The short life span of BEX's exchange raises doubts as to whether a fully automated exchange can ultimately compete with the traditional exchanges and Nasdaq.