The SMI MID (SMIM) is a stock index which lists Switzerland's mid-cap companies.

The company size is based on terms of order book volume and market capitalization.

[1] 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.

[3][4] In the week beginning on Monday, 19 September 2022, SGS (formerly in the SMI), Belimo and the Roche bearer shares will enter SMIM.

[7] On October 16, 2020, Tecan was added to the index after the takeover of Sunrise Communications Group AG.