A market capitalization weighted index of the largest 200 companies in the Russell 3000. The Russell Top 200 Index is a benchmark index for U.S.-based large-cap stocks; the average member has a market cap above $100 billion. The index is reconstituted annually to account for new members and growing companies.
Taobiz explains Russell Top 200 Index
The Russell Top 200 is a more concentrated index than the S&P 500, although most of the Russell Top 200 members are also included in the S&P. The Russell Top 200 Index represents approximately two thirds of the total market capitalization of all U.S. listed stocks.