The SPI 20 is a capitalization-weighted stock index of large-cap companies listed on the SIX Swiss Exchange.

[2] It is made up of the same components as the Swiss Market Index, except that it does not have any cap on the maximum percentage that a component can have.

It was created in 2017, after the largest SMI constituents were capped at 18%.

The index was standardized at 1500 points on 30 June 1988 and the history is available back until 29 January 1988.

[1] As of September 20, 2021, the following 20 stocks make up the SPI 20 index.