The Portuguese Stock Index PSI 20 is a benchmark stock market index which tracks the performance of 20 companies with the largest market capitalization and share turnover in the Euronext Lisbon Stock Exchange. It is a free-float, capitalization weighted index. The PSI 20 Index has a base value of 3000 as of December 31, 1992. This page provides - Portugal Stock Market (PSI20) - actual values, historical data, forecast, chart, statistics, economic calendar and news. Portugal Stock Market (PSI20) - actual data, historical chart and calendar of releases - was last updated on May of 2018.