The main index is the PSI-20 (Portuguese Stock Index).
The PSI-20 is a stock market index of stocks that trade on Euronext Lisbon. It reflects the evolution of the prices of the 20 largest and most liquid share issues selected from the universe of companies listed on the Portuguese Main Market.
The PSI-20 is used as a benchmark for the Portuguese stock market.
Euronext Lisbon stock exchange, a part of the Pan-European Euronext group, has many other companies listed (which are not included in the PSI-20 index).
Euronext manages a variety of indexes. The most popular index is the Euronext 100, which consists of the 100 largest stocks on Euronext. This index is essentially Euronext's blue chip index.