From INET (not me) You know that the Exchange Traded Fund QQQ is one of the most actively traded securities listed on either the AMEX or the NYSE, and on many days is the most actively traded security in the entire U.S. equities market. You may also know that INET is the largest and most liquid marketplace for trading QQQ. But did you know that yesterday, with 43% market share, INET's volume in QQQ surpassed the *combined* volume of ArcaEx, The American Stock Exchange, The New York Stock Exchange, Boston Stock Exchange, and Chicago Stock Exchange?[1]