iShares Russell 2000 ETFIWM

IWM, the iShares Russell 2000 ETF, tracks the Russell 2000 index of around 2,000 small-capitalization US companies. It gives you exposure to the small-cap segment of the market in a single, diversified investment. Because smaller companies are more sensitive to the economy and borrowing costs, IWM tends to be more volatile than large-cap funds and is often watched as a gauge of risk appetite. It can fall sharply in downturns. Check the expense ratio and invest only what you can afford to leave invested.