The S&P SL20, or the Standard & Poor's Sri Lanka 20, is a stock market index, based on market capitalization, that follows the performance of 20 leading publicly traded companies listed in the Colombo Stock Exchange. The 20 companies that make up the index is determined by Standard & Poor's global index methodology, according to which the index's listing is reviewed each year. All S&P SL20 listed stocks are classified according to S&P and MSCI's Global Industry Classification Standard, thereby enabling better comparison of performance of Sri Lanka's largest and most liquid stocks with other global indices.