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 the United States as measured by total market capitalization, and represents approximately 98% 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. As of 31 December 2024, the weighted average market capitalization of a company in the index is approximately $966 million and the median market capitalization is $2.28 billion. The ticker symbol on most systems is either RUA or ^RUA. Wikipedia