The Swiss Market Index SMI is a major stock market index which tracks the performance 20 largest and most liquid stocks based in the Swiss Exchange. It is a free-float, capitalization-weighted index. The SMI companies represent about 85 percent of the Swiss equity market. The SMI has a base value of 1500 as of June 30, 1988. This page provides - Switzerland Stock Market (SMI) - actual values, historical data, forecast, chart, statistics, economic calendar and news. Switzerland Stock Market (SMI) - actual data, historical chart and calendar of releases - was last updated on September of 2018.