Hi all ! 1) What are the most known Tracking Stocks on the market? Please, help me to complete the list below with symbols and description: QQQQ - it is a stock that tracks the index NDX (Nasdaq 100) SMH - semi-conductor holders trust SPY - SPDR_S&P_500_ETF_TRUST Optional questions: ------------------------------ 2) Are all they ETFs ? 3) How do you use them as day trader if you do not want to trade them? As index? To gauge a sector? To gauge the day as bearish or bullish? Thanks in advance !