The term Russell 1000 Index refers to a composite that includes large and mid-cap companies located in the United States. The Russell 1000 is published and maintained by FTSE Russell.
The Russell 1000 Index is designed to be a measure of the large and mid-sized capitalization companies in the United States equities market. The index is a composite of roughly 1,000 securities issued by the largest companies in the U.S. in terms of market capitalization. At the time of writing, there were 1,000 stocks in the index with a market capitalization that averaged $130 billion and accounted for approximately 90% of the total capitalization of the U.S. equities market.
First launched on January 1, 1984, the companies included in the index are selected based on float-adjusted market capitalization. On the last trading day of May, FSTE Russell ranks eligible companies based on their total market capitalization values. On the last Friday of June, the index is reconstituted. To be eligible for inclusion in a U.S. equity market index, the securities must trade on the NYSE, NYSE MKT, NASDAQ, or ARCA exchanges. The performance of this index can be monitored via the stock ticker symbol RUI.