The Russell 1000, a subset of the Russell 3000, is a large-cap stock index consisting of the largest 1,000 publicly listed U.S. companies, ranked by market value. Despite the index having only a third of the stocks in the Russell 3000, which covers 96% of the U.S. investable stock market universe, it still offers a broad representation — 93% of the stock market. FTSE Russell, a wholly owned London Stock Exchange Group subsidiary, established the Russell 1000 on January 1, 1984.