PSI-20

The PSI-20 (an acronym of Portuguese Stock Index) is a benchmark stock market index of companies that trade on Euronext Lisbon, the main stock exchange of Portugal. The index tracks the prices of the twenty listings with the largest market capitalisation and share turnover in the PSI Geral, the general stock market of the Lisbon exchange. It is one of the main national indices of the pan-European stock exchange group Euronext alongside Brussels' BEL20, Paris's CAC 40 and Amsterdam's AEX. On August 12, 2021 index has been renamed from PSI-20 to PSI.

==History== thumb|280px|Price evolution of the PSI-20 between 1992 and 2012. The PSI-20 was initiated on 31 December 1992 with a base value of 3,000 index points. The index experienced considerably more volatility than the world's main financial markets between 1998 and 2000, caused by uncertainty in the world's emerging markets: a sharp increase of over 50% in the PSI-20's value in the first four months of 1998 was followed by a decline of similar magnitude between July and October of that year. Another price surge sparked at the tail end of 1999 peaked with the index's highest value to date, 14,822,59 set on 3 March 2000. The Portuguese blue-chip market's subsequent performance has broadly followed the trends set by other Western indices, falling in the aftermath of the dot-com bubble before recovering significantly from 2003 onwards.