What is Qqqj etf? Like all exchange-traded funds (ETFs), the SPDR S&P 500 ETF Trust (NYSEARCA:QQQ) is a security that represents a basket of stocks. In the case of QQQ, it tracks the S&P 500 index, holding the 500 largest U.S. companies. The QQQ ETF is one of the most popular on the market, with […]