The SPDR® S&P® 500® ETF Trust (NYSEArca: SPY) is the most popular ETF in the world, with over $236 billion in assets under management. But for investors looking for exposure to the tech-heavy Nasdaq-100 Index, there’s another option: the PowerShares QQQ Trust, Series 1 (Nasdaq: QQQ) The QQQ ETF is the second-largest ETF in the […]