- SIGVARIS AG
- SIGVARIS Management AG
- Sihlsana AG
- Sihltal Zürich Uetliberg Bahn SZU AG
- Sika AG
- Sika Automotive AG
- Sika Europe Management AG
- Sika Finanz AG
- Sika Gesellschaften in der Schweiz
- Sika Global Business Management AG
- Sika Informationssysteme AG
- Sika Manufacturing AG
- Sika Schweiz (Aliva)
- Sika Schweiz AG
- Sika Schweiz AG / Aliva Equipment
- Sika Services AG
- Sika Technology AG
- SikaBau AG
- Sikla (Schweiz AG)
- Silent Gliss International AG
- SILEX
- SILEX Investment Partners
- Siloah, Akutklinik, Pflege und Rehabilitation
- Silogplus SA
- sim Immobilien AG
- simatec ag
- simcla AG
- Simec AG
- Simeon & Partner Architekten und Bau AG
- Similasan AG
- SIMON PROtec Systems AG
- Simpex Electronic AG
- simplicity networks GmbH
- Singapore Airlines Ltd.
- Singapore Airlines Ltd., Zurich Branch
- Sinnvoll Gastro GmbH
- Sintetica SA
- Sintratec
- Sintratec AG
- SIR Service d'Intervention Rapide SA
- SIRAD SA
- Sirec Services SA
- SIRVA
- SIS Medical AG
- SIS Swiss International School Schweiz AG
- SISA Studio Informatica SA
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