Some of the most popular ETFs are the S&P 500 Index Depositary Receipts (known as Spiders, because their trading symbol is SPY), iShares Core S&P 500 (trading symbol IVV), Vanguard Total Stock Market ETF (trading symbol VTI), the Dow Jones Industrial Average Model Depositary Shares (or Diamonds; trading symbol: DIA), the NASDAQ 100 Trust (known as Cubes, after its QQQ symbol), and the S&P MidCap 400 Depositary Receipts (symbol MDY).
