The PSI 20 decreased 164 points or 3.34% since the beginning of 2021, according to trading on a contract for difference (CFD) that tracks this benchmark index from Portugal. Historically, the Portugal Stock Market (PSI20) reached an all time high of 15080.99 in March of 2000. 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.