The Russell 3000 Index is a capitalization-weighted stock market index 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 as measured by total market capitalization, and represents approximately 97% of the American public equity market. The index was launched on January 1, 1984, and is maintained by FTSE Russell, a subsidiary of the London Stock Exchange Group. The ticker symbol on most systems is ^RUA. Record values Annual returns Investing The Russell 3000 Index is tracked by several exchange-traded funds, such as the iShares Russell 3000 ETF () and the Vanguard Russell 3000 ETF (). Ten largest constituents Apple () Microsoft () Amazon () Alphabet (Class A) () Tesla () Alphabet (Class C) () Meta Platforms () Nvidia () Berkshire Hathaway () UnitedHealth () (as of December 31, 2021) Top sectors by weight Technology Consumer Discretionary Health Care Industrials Financials Consumer Staples Telecommunications Real Estate Utilities Energy Basic Materials (as of September 30, 2020) See also S&P 1500 Russell Investments Russell 2000 Index Russell 1000 Index References External links Russell Investment Group Index Construction and Methodology Yahoo! Finance page for ^RUA Bloomberg page for RAY:IND 3000_Index American stock market indices