The benchmark focuses on the 20 largest listed firms in the US equity market.

JonesTrading Institutional Services has launched the JT20 Index, a market capitalisation-weighted index tracking the 20 largest listed companies in the United States. The JT20 Index currently represents about 49.9% of the total market capitalisation of the S&P 500  The index is designed to reflect the performance of the biggest firms that drive movements in the US stock market. It is available on Bloomberg under the tickers JT20P for price return and JT20T for total return. The JT2