query: instance_of russell top 50 index
supports: A stock index or stock market index is a measurement of the value of a section of the stock market. It is computed from the prices of selected stocks (typically a weighted average). It is a tool used by investors and financial managers to describe the market, and to compare the return on specific investments. The Russell 3000 Index is a capitalization-weighted stock market index, maintained by FTSE Russell, that seeks to be a benchmark of the entire U.S stock market. It measures the performance of the 3,000 largest publicly held companies incorporated in America and is based on market capitalization. It represents approximately 98% of the American public equity market. The stocks of the Russell 3000 Index have a weighted average market capitalization of about $126 billion; the median market capitalization is approximately $1.6 billion. The index was launched on January 1, 1984. The Russell Top 50 Index measures the performance of the largest companies in the Russell 3000 Index . It includes approximately 50 of the largest securities based on a combination of their market cap and current index membership and represents approximately 40 % of the total market capitalization of the Russell 3000 .
candidates: 1 index performance public stock market index value
answer: stock market index