State Street SPDR S&P 500 ETF (SPY)

AMEX Financial Services Asset Management

SPY is the best-recognized and oldest US listed ETF and typically tops rankings for largest AUM and greatest trading volume. The fund tracks the massively popular US index, the S&P 500. Few realize that S&P's index committee chooses 500 securities to represent the US large-cap space - not necessarily the 500 largest by market cap, which can lead to some omissions of single names. Still, the index offers outstanding exposure to the US large-cap space. It's important to note, SPY is a unit investment trust, an older but entirely viable structure. As a UIT, SPY must fully replicate its index (it …