instance_of russell top 50 index
The Russell Top 50 ___MASK74___ measures the ___MASK11___ of the largest companies in the Russell 3000 ___MASK74___ . It includes approximately 50 of the largest securities based on a combination of their ___MASK53___ cap and current index membership and represents approximately 40 % of the total ___MASK53___ capitalization of the Russell 3000 . A stock ___MASK74___ or ___MASK91___ 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 ___MASK74___ is a capitalization - weighted ___MASK91___ , 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 ___MASK74___ 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 .