The Russell 3000 is a stock market index that represents the performance of the 3,000 largest publicly traded companies in the United States. It includes a diverse range of sectors, providing a comprehensive view of the overall U.S. equity market. This index is often used by investors to gauge market trends and make investment decisions. It is a key benchmark for many mutual funds and exchange-traded funds (ETFs), helping to track the performance of the broader market and assess the health of the economy.