The Russell 2000 Index measures the performance of approximately 2,000 small-cap companies in the Russell 3000 Index, which is made up of 3,000 of the biggest U.S. stocks. The Russell 2000 Index serves as a benchmark for small-cap stocks in the United States. The weighted average market capitalization for companies in the Russell 2000 Index is about US$1.3 billion. Please note that an investor cannot invest directly in an index.