The NASDAQ-100 is a stock market index of 100 of the largest domestic and international non-financial companies listed on the NASDAQ stock exchange. The NASDAQ-100 is a modified market value-weighted index; the companies weight in the index are based on their market capitalization, with certain rules capping the influence of the largest components.
The PowerShares QQQ exchange-traded fund, sponsored and overseen since March 21, 2007 by Invesco through PowerShares, trades under the ticker NASDAQ: QQQ. It is commonly referred to by its ticker or nickname, the “cubes”. It was formerly called NASDAQ-100 Trust Series 1. On December 1, 2004, it was moved from the American Stock Exchange where it had the symbol QQQ to the NASDAQ and given the new four letter code QQQQ, sometimes called the “quad Qs” by traders. On March 23, 2011, Nasdaq changed its symbol back to QQQ
The following two factors differentiate the NASDAQ-100 index from the S&P 500 and the Dow Jones Industrial Average.
The NASDAQ-100 does not contain financial companies.
The NASDAQ-100 does include companies incorporated outside the United States.