The SMI MID was introduced on 15 November 2004, computed back to 3 January 1996 with a baseline value of 1000 points as of 31 December 1999.[1] Its composition is examined once a year. Calculation takes place in real-time: as soon as a new transaction occurs in a security contained in the SMI MID, an updated index level is calculated and displayed.[citation needed]
In the week beginning on Monday, 19 September 2022, SGS (formerly in the SMI), Belimo and the Roche bearer shares will enter SMIM. They will replace Sonova (hearing aids), Cembra (credit cards and consumer credits) and BB Biotech (biotechnology investment company).[5]
On March 31, 2022 the biochemical company Bachem was added to the index, replacing Vifor Pharma , because after sell of Vifor Pharma to the Australian CSL the free float dropped to 1.6% which is below the minimum of 20% required by SIX for index members.[6]
On September 18, 2020, four components were replaced.[7]
On October 16, 2020, Tecan was added to the index after the takeover of Sunrise Communications Group AG.[8]
